/* ==========================================================================
   Hoàng Như Định Guitar - Landing Page Styles
   Design inspired by Dribbble Piano Teacher (shots/26909131)
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #E91E8C;
    --color-primary-light: #FF4DA6;
    --color-secondary: #F5A623;
    --color-secondary-light: #FFB84D;

    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #E91E8C 0%, #F5A623 100%);
    --gradient-primary-hover: linear-gradient(135deg, #D41B7F 0%, #E0961F 100%);

    /* Text Colors */
    --color-text: #1A1A2E;
    --color-text-body: #4A4A4A;
    --color-text-muted: #888888;
    --color-text-light: #666666;

    /* Background Colors */
    --color-bg: #FFFFFF;
    --color-bg-alt: #FFF9FB;
    --color-bg-card: #FFFFFF;
    --color-bg-footer: #1A1A2E;

    /* Border */
    --color-border: #EEEEEE;
    --color-border-light: #F5F5F5;

    /* Accent Badges */
    --color-badge-pink: #FFE5F3;
    --color-badge-orange: #FFF3E0;
    --color-badge-yellow: #FFF8E1;
    --color-badge-green: #E8F5E9;

    /* Typography - Vietnamese optimized */
    --font-heading: 'Lora', Georgia, serif;
    --font-body: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Z-index */
    --z-header: 100;
    --z-modal: 200;
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-body);
    background-color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding: var(--space-20) 0;
}

.section--alt {
    background-color: var(--color-bg-alt);
}

.section--dark {
    background-color: var(--color-bg-footer);
    color: white;
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section__header--left {
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.section__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
}

.section__subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.text-primary {
    color: var(--color-primary);
}

.text-secondary {
    color: var(--color-secondary);
}

.underline-accent {
    position: relative;
}

.underline-accent::after {
    content: '';
    position: absolute;
    bottom: 0.1em;
    left: 0;
    width: 100%;
    height: 0.2em;
    background-color: var(--color-secondary);
    opacity: 0.6;
    z-index: -1;
    border-radius: var(--radius-full);
}

.highlight {
    position: relative;
}

.star {
    color: var(--color-secondary);
    margin-right: var(--space-2);
}

.heart {
    color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn--primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
}

.btn--primary:hover {
    background: var(--gradient-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(233, 30, 140, 0.3);
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

.btn--full {
    width: 100%;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background-color: var(--color-bg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.header--scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text);
}

.nav__logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.nav__logo-img {
    width: 40px;
    height: auto;
    object-fit: contain;
}

.nav__menu {
    display: flex;
    gap: var(--space-8);
}

.nav__link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-body);
    transition: color var(--transition-fast);
}

.nav__link:hover {
    color: var(--color-primary);
}

.nav__cta {
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

/* User Menu in Nav */
.user-menu {
    display: none;
    align-items: center;
    gap: var(--space-4);
}

.user-menu__avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    cursor: pointer;
}

.user-menu__dropdown {
    position: relative;
}

.user-menu__dropdown-content {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--space-2);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2);
    min-width: 180px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.user-menu__dropdown:hover .user-menu__dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu__dropdown-item {
    display: block;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text-body);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    text-align: left;
    border: none;
    background: none;
    cursor: pointer;
}

.user-menu__dropdown-item:hover {
    background-color: var(--color-bg-alt);
}

.user-menu__name {
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-3);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero__bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transform: scale(1.1);
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%);
}

.hero__content {
    max-width: 700px;
    color: white;
    padding: var(--space-16) 0;
}

.hero__title {
    font-size: var(--text-5xl);
    font-weight: 500;
    margin-bottom: var(--space-6);
    color: white;
}

.hero__title .highlight {
    color: var(--color-secondary);
}

.hero__subtitle {
    font-size: var(--text-xl);
    margin-bottom: var(--space-8);
    opacity: 0.95;
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.about__image-wrapper {
    position: relative;
}

.about__image {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.about__quote {
    margin-top: var(--space-4);
    font-style: italic;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.about__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-6);
}

.about__text {
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    color: var(--color-text-body);
}

.about__credentials {
    margin-top: var(--space-8);
}

.credential {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    font-weight: 500;
}

.credential__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
}

.credential__icon svg {
    width: 22px;
    height: 22px;
}

.credential__icon--pink {
    background-color: var(--color-badge-pink);
    color: var(--color-primary);
}

.credential__icon--orange {
    background-color: var(--color-badge-orange);
    color: var(--color-secondary);
}

.credential__icon--yellow {
    background-color: var(--color-badge-yellow);
    color: #F5A623;
}

/* --------------------------------------------------------------------------
   Services Section
   -------------------------------------------------------------------------- */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.service-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    text-align: center;
    transition: all var(--transition-base);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
    border-color: var(--color-primary);
}

.service-card__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-5);
}

.service-card__icon svg {
    width: 26px;
    height: 26px;
}

.service-card__icon--pink {
    background-color: var(--color-badge-pink);
    color: var(--color-primary);
}

.service-card__icon--orange {
    background-color: var(--color-badge-orange);
    color: var(--color-secondary);
}

.service-card__icon--yellow {
    background-color: var(--color-badge-yellow);
    color: #D4930D;
}

.service-card__title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-3);
}

.service-card__desc {
    font-size: var(--text-sm);
    line-height: 1.6;
    color: var(--color-text-light);
    margin-bottom: var(--space-5);
}

.service-card__features {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    text-align: left;
}

.service-card__features li {
    font-size: var(--text-sm);
    color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   Lessons Section
   -------------------------------------------------------------------------- */
.lessons__wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--space-12);
}

.lessons__groups {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.lessons__formats {
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
}

.lessons__formats-title {
    font-size: var(--text-2xl);
    text-align: center;
    margin-bottom: var(--space-8);
}

.lessons__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.lesson-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.lesson-card__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-2);
}

.lesson-card__age {
    color: var(--color-secondary);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.lesson-card__desc {
    color: var(--color-text-body);
    margin-bottom: var(--space-6);
}

.lesson-card__features {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.lesson-card__features li {
    color: var(--color-text-light);
    font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   Formats Section
   -------------------------------------------------------------------------- */
.formats__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    max-width: 900px;
    margin: 0 auto;
}

.format-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    transition: border-color var(--transition-base);
}

.format-card:hover {
    border-color: var(--color-primary);
}

.format-card__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
}

.format-card__desc {
    color: var(--color-text-body);
    margin-bottom: var(--space-6);
}

.format-card__features {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.format-card__features li {
    color: var(--color-text-light);
    font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   Experience Section
   -------------------------------------------------------------------------- */
.experience__video {
    max-width: 900px;
    margin: 0 auto;
}

.experience__video-wrapper {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    aspect-ratio: 3 / 4;
    max-width: 500px;
    margin: 0 auto;
}

.experience__video-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.experience__play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background-color: var(--color-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-base);
}

.experience__play-btn svg {
    width: 32px;
    height: 32px;
    margin-left: 4px;
}

.experience__play-btn:hover {
    transform: translate(-50%, -50%) scale(1.1);
    box-shadow: 0 10px 30px rgba(245, 166, 35, 0.4);
}

.experience__video-label {
    position: absolute;
    bottom: 50%;
    left: 50%;
    transform: translate(-50%, 60px);
    color: white;
    font-weight: 500;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.experience__caption {
    text-align: center;
    font-style: italic;
    color: var(--color-text-muted);
    margin-top: var(--space-6);
}

/* Experience Grid Layout */
.experience__grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--space-16);
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
}

.experience__video-col {
    display: flex;
    justify-content: center;
}

.experience__video-wrapper--vertical {
    position: relative;
    width: 100%;
    aspect-ratio: 9 / 16;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.experience__video-wrapper--vertical iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.experience__content-col {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.experience__title {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.experience__desc {
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.experience__song-info {
    background: linear-gradient(135deg, var(--color-primary) 0%, #d63384 100%);
    border-radius: var(--radius-xl);
    padding: var(--space-5) var(--space-6);
    margin-bottom: var(--space-6);
    color: white;
}

.experience__song-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-1);
    color: white;
}

.experience__song-artist {
    color: rgba(255, 255, 255, 0.85);
    font-size: var(--text-sm);
}

.experience__stats {
    display: flex;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.experience__stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
}

.experience__stat-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.experience__stat-icon svg {
    width: 100%;
    height: 100%;
}

.experience__stat-value {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text);
}

.experience__stat-label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.experience__btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.experience__btn svg {
    width: 20px;
    height: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .experience__grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }

    .experience__video-col {
        order: 1;
    }

    .experience__content-col {
        order: 2;
    }

    .experience__video-wrapper--vertical {
        width: 280px;
        margin: 0 auto;
    }

    .experience__title {
        font-size: var(--text-2xl);
    }

    .experience__stats {
        justify-content: center;
    }

    .experience__btn {
        width: 100%;
        justify-content: center;
    }
}

/* --------------------------------------------------------------------------
   Artist Collaborations Section
   -------------------------------------------------------------------------- */
.collaborations__carousel-wrapper {
    position: relative;
    overflow: hidden;
    margin: 0 auto;
    max-width: 100%;
}

.collaborations__carousel {
    display: flex;
    gap: var(--space-6);
    animation: scroll-carousel 35s linear infinite;
    width: max-content;
}

.collaborations__carousel:hover {
    animation-play-state: paused;
}

@keyframes scroll-carousel {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Hide scrollbar */
.collaborations__carousel::-webkit-scrollbar {
    display: none;
}

.collaborations__carousel {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.collab-card {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    aspect-ratio: 3 / 4;
    cursor: pointer;
    flex-shrink: 0;
    width: calc((100vw - 6rem) / 3);
    max-width: 320px;
    min-width: 240px;
}

.collab-card__image {
    width: 100%;
    height: 100%;
}

.collab-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.collab-card:hover .collab-card__image img {
    transform: scale(1.05);
}

.collab-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, transparent 60%);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: var(--space-6);
}

.collab-card__info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transform: translateY(10px);
    opacity: 0;
    transition: all var(--transition-base);
}

.collab-card:hover .collab-card__info {
    transform: translateY(0);
    opacity: 1;
}

.collab-card__icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.collab-card__name {
    color: white;
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.collaborations__note {
    text-align: center;
    margin-top: var(--space-8);
    color: var(--color-text-muted);
    font-style: italic;
}

@media (max-width: 1024px) {
    .collab-card {
        width: calc((100vw - 4rem) / 2);
        max-width: 280px;
    }
}

@media (max-width: 640px) {
    .collab-card {
        width: calc(100vw - 4rem);
        max-width: 300px;
    }

    .collaborations__carousel {
        animation-duration: 25s;
    }
}

/* --------------------------------------------------------------------------
   Pricing Section
   -------------------------------------------------------------------------- */
.pricing__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.pricing-card {
    position: relative;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.pricing-card--featured {
    border: 2px solid var(--color-primary);
}

.pricing-card__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    white-space: nowrap;
}

.pricing-card__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-3);
}

.pricing-card__price {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--space-1);
}

.pricing-card__sessions {
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.pricing-card__features {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.pricing-card__features li {
    color: var(--color-text-light);
    font-size: var(--text-sm);
}

.pricing__cta {
    text-align: center;
    margin-top: var(--space-12);
}

/* --------------------------------------------------------------------------
   Testimonials Section
   -------------------------------------------------------------------------- */
.testimonials__wrapper {
    position: relative;
}

.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.testimonial-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
}

.testimonial-card--highlight {
    background: linear-gradient(135deg, rgba(233, 30, 140, 0.05) 0%, rgba(245, 166, 35, 0.05) 100%);
    border-color: rgba(233, 30, 140, 0.2);
}

.testimonial-card__quote {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    color: var(--color-secondary);
    opacity: 0.5;
    line-height: 1;
}

.testimonial-card__text {
    font-style: italic;
    color: var(--color-text-body);
    margin: var(--space-4) 0;
    line-height: 1.7;
}

.testimonial-card__author {
    font-weight: 600;
    color: var(--color-text);
}

.testimonials__nav {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    display: none;
    gap: var(--space-2);
}

.testimonials__nav-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.testimonials__nav-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.testimonials__nav-btn svg {
    width: 20px;
    height: 20px;
}

.testimonials__dots {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-8);
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background-color: var(--color-border);
    transition: all var(--transition-fast);
}

.dot.active {
    background-color: var(--color-secondary);
    width: 24px;
}

/* --------------------------------------------------------------------------
   FAQ Section
   -------------------------------------------------------------------------- */
.faq__list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-4);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.faq-item--active {
    border-color: var(--color-primary);
}

.faq-item__question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    font-size: var(--text-base);
    font-weight: 500;
    text-align: left;
    color: var(--color-text);
    transition: background-color var(--transition-fast);
}

.faq-item__question:hover {
    background-color: var(--color-bg-alt);
}

.faq-item__icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-item--active .faq-item__icon {
    transform: rotate(180deg);
}

.faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item--active .faq-item__answer {
    max-height: 300px;
}

.faq-item__answer p {
    padding: 0 var(--space-6) var(--space-6);
    color: var(--color-text-body);
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.contact__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
}

.contact__subtitle {
    color: var(--color-text-body);
    font-size: var(--text-lg);
    margin-bottom: var(--space-8);
}

.contact__expect {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}

.contact__expect h4 {
    font-family: var(--font-body);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.contact__expect ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.contact__expect li {
    color: var(--color-text-light);
    font-size: var(--text-sm);
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact__detail {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.contact__detail-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.contact__detail-icon svg {
    width: 20px;
    height: 20px;
}

.contact__detail-icon--pink {
    background-color: var(--color-badge-pink);
    color: var(--color-primary);
}

.contact__detail-icon--green {
    background-color: var(--color-badge-green);
    color: #22C55E;
}

.contact__detail-icon--orange {
    background-color: var(--color-badge-orange);
    color: var(--color-secondary);
}

.contact__form {
    background-color: var(--color-bg-card);
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast);
    background-color: var(--color-bg);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background-color: var(--color-bg-footer);
    color: white;
    padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-12);
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-4);
}

.footer__logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.footer__logo-img {
    width: 40px;
    height: auto;
    object-fit: contain;
}

.footer__tagline {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-4);
}

.footer__message {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-sm);
    line-height: 1.6;
}

.footer__heading {
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--space-5);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__links a,
.footer__links li {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer__links a:hover {
    color: white;
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-8);
    text-align: center;
}

.footer__bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   Responsive Styles
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .hero__title {
        font-size: var(--text-4xl);
    }

    .about__grid {
        gap: var(--space-10);
    }

    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .lessons__groups,
    .pricing__grid,
    .testimonials__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.5rem;
        /* Fix small text on mobile - increase readability */
        --text-xs: 0.8125rem; /* 13px instead of 12px */
        --text-sm: 0.9375rem; /* 15px instead of 14px */
    }

    .nav__menu,
    .nav__cta {
        display: none;
    }

    .nav__toggle {
        display: flex;
    }

    .nav__menu.active {
        display: flex;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg);
        padding: var(--space-6);
        box-shadow: var(--shadow-lg);
        gap: var(--space-4);
    }

    .hero {
        margin-top: 70px;
        min-height: calc(100vh - 70px);
    }

    .hero__content {
        padding: var(--space-8) 0;
    }

    .about__grid,
    .contact__grid {
        grid-template-columns: 1fr;
    }

    .about__image-wrapper {
        order: -1;
    }

    .lessons__groups,
    .formats__grid,
    .pricing__grid,
    .testimonials__grid,
    .services__grid {
        grid-template-columns: 1fr;
    }

    .lessons__formats {
        padding: var(--space-6);
    }

    .section {
        padding: var(--space-16) 0;
    }

    .section__title {
        font-size: var(--text-3xl);
    }

    .footer__grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer__brand {
        margin-bottom: var(--space-8);
    }

    .footer__logo {
        justify-content: center;
    }

    .testimonials__dots {
        display: flex;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }

    .hero__title {
        font-size: var(--text-3xl);
    }

    .btn--lg {
        padding: var(--space-3) var(--space-6);
        font-size: var(--text-base);
    }

    .contact__form {
        padding: var(--space-6);
    }
}

/* --------------------------------------------------------------------------
   Modal Styles
   -------------------------------------------------------------------------- */
.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal__overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal__content {
    position: relative;
    background-color: var(--color-bg);
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
    width: 100%;
    max-width: 420px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: transform var(--transition-base);
    margin: var(--space-4);
}

.modal.active .modal__content {
    transform: translateY(0);
}

.modal__close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    width: 32px;
    height: 32px;
    font-size: 24px;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.modal__close:hover {
    background-color: var(--color-bg-alt);
    color: var(--color-text);
}

.modal__title {
    text-align: center;
    font-size: var(--text-2xl);
    margin-bottom: var(--space-6);
}

/* Auth Tabs */
.auth-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.auth-tab {
    flex: 1;
    padding: var(--space-3);
    font-weight: 600;
    color: var(--color-text-muted);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all var(--transition-fast);
}

.auth-tab:hover {
    color: var(--color-text);
}

.auth-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Auth Form */
.auth-form .form-group {
    margin-bottom: var(--space-5);
}

.auth-error {
    color: #EF4444;
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
    text-align: center;
    min-height: 20px;
}

.auth-note {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-align: center;
    margin-top: var(--space-4);
}

/* --------------------------------------------------------------------------
   Notification Toast
   -------------------------------------------------------------------------- */
.notification {
    position: fixed;
    top: 90px;
    right: var(--space-6);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    background-color: var(--color-bg);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--color-primary);
    z-index: 300;
    transform: translateX(120%);
    transition: transform var(--transition-base);
    max-width: 350px;
}

.notification.show {
    transform: translateX(0);
}

.notification--success {
    border-left-color: #22C55E;
}

.notification--error {
    border-left-color: #EF4444;
}

.notification__text {
    font-size: var(--text-sm);
    color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Courses Page Styles
   -------------------------------------------------------------------------- */

/* Courses Hero */
.courses-hero {
    background-color: var(--color-bg-alt);
    padding: var(--space-20) 0 var(--space-12);
    margin-top: 70px;
    text-align: center;
}

.courses-hero__title {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-4);
}

.courses-hero__subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-muted);
}

/* Course Filter */
.courses-filter {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    margin-bottom: var(--space-10);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-2) var(--space-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-body);
    background: transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-8);
}

/* Course Card */
.course-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.course-card--locked {
    opacity: 0.85;
}

.course-card__image {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.course-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.course-card:hover .course-card__image img {
    transform: scale(1.05);
}

.course-card__badge {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
}

.course-card__content {
    padding: var(--space-6);
}

.course-card__meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.course-card__level {
    background-color: var(--color-badge-orange);
    color: var(--color-secondary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
}

.course-card__stats {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.course-card__title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-3);
    line-height: 1.3;
}

.course-card__desc {
    font-size: var(--text-sm);
    color: var(--color-text-body);
    margin-bottom: var(--space-5);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-card__price {
    font-weight: 700;
    color: var(--color-secondary);
    font-size: var(--text-lg);
}

.btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* Courses Empty/Error States */
.courses-empty,
.courses-error {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-16);
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Course Detail Page Styles
   -------------------------------------------------------------------------- */
.course-page {
    padding-top: calc(70px + var(--space-10));
    padding-bottom: var(--space-16);
    min-height: 100vh;
}

.course-header__back {
    display: inline-block;
    margin-bottom: var(--space-6);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.course-header__back:hover {
    color: var(--color-primary);
}

.course-header__grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--space-12);
    align-items: start;
}

.course-header__badge {
    display: inline-block;
    background-color: var(--color-badge-orange);
    color: var(--color-secondary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.course-header__title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
}

.course-header__desc {
    font-size: var(--text-lg);
    color: var(--color-text-body);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.course-header__stats {
    display: flex;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
    color: var(--color-text-muted);
}

.course-instructor {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-6);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-8);
}

.course-instructor__avatar {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.course-instructor__name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-1);
}

.course-instructor__title {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.course-header__image {
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.course-header__image img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

/* Course CTA */
.course-cta {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.course-price {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-secondary);
}

.course-coming-soon {
    color: var(--color-text-muted);
    font-style: italic;
}

.course-progress {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-2);
}

.course-progress__bar {
    flex: 1;
    height: 8px;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.course-progress__fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* Lessons List */
.course-lessons {
    margin-top: var(--space-16);
}

.course-lessons__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-6);
}

.lessons-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-5);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-fast);
}

.lesson-item:hover {
    border-color: var(--color-primary);
}

.lesson-item--locked {
    opacity: 0.6;
}

.lesson-item--locked:hover {
    border-color: var(--color-border);
}

.lesson-item__number {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.lesson-item__info {
    flex: 1;
    min-width: 0;
}

.lesson-item__title {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: var(--text-base);
    margin-bottom: var(--space-1);
}

.lesson-item__duration {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.lesson-item__play {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.lesson-item__play:hover {
    transform: scale(1.1);
}

.lesson-item__lock {
    font-size: var(--text-lg);
    flex-shrink: 0;
}

/* Loading */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
    color: var(--color-text-muted);
}

.loading__spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin-bottom: var(--space-4);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error State */
.error {
    text-align: center;
    padding: var(--space-16);
    color: var(--color-text-muted);
}

/* Active Nav Link */
.nav__link--active {
    color: var(--color-primary);
}

/* Responsive - Course Pages */
@media (max-width: 968px) {
    .course-header__grid {
        grid-template-columns: 1fr;
    }

    .course-header__image {
        order: -1;
        max-width: 500px;
    }

    .course-header__title {
        font-size: var(--text-3xl);
    }
}

@media (max-width: 768px) {
    .courses-hero {
        padding: var(--space-16) 0 var(--space-10);
    }

    .courses-hero__title {
        font-size: var(--text-4xl);
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .course-header__title {
        font-size: var(--text-2xl);
    }

    .course-header__desc {
        font-size: var(--text-base);
    }

    .lesson-item {
        padding: var(--space-4);
    }

    .lesson-item__title {
        font-size: var(--text-sm);
    }
}

/* --------------------------------------------------------------------------
   Lesson Player Styles
   -------------------------------------------------------------------------- */
.lesson-body {
    background-color: var(--color-bg-footer);
}

/* Lesson Header */
.lesson-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--color-bg-footer);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    z-index: var(--z-header);
}

.lesson-header__back {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.lesson-header__back:hover {
    color: white;
}

.lesson-header__title {
    color: white;
    font-weight: 500;
    font-size: var(--text-sm);
    max-width: 400px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-header__user {
    width: 150px;
    text-align: right;
}

/* Main Content */
.lesson-main {
    padding-top: 60px;
    min-height: 100vh;
}

.lesson-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    min-height: calc(100vh - 60px);
}

/* Video Area */
.lesson-video {
    background-color: #000;
    display: flex;
    flex-direction: column;
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 aspect ratio */
    background-color: #000;
}

.video-wrapper iframe,
.video-wrapper #youtube-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.lesson-info {
    flex: 1;
    padding: var(--space-8);
    background-color: var(--color-bg);
}

.lesson-info__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
}

.lesson-info__desc {
    color: var(--color-text-body);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

/* Complete Checkbox */
.lesson-complete {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    margin-bottom: var(--space-8);
    padding: var(--space-4);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-fast);
}

.lesson-complete:hover {
    background-color: var(--color-badge-green);
}

.lesson-complete input {
    display: none;
}

.lesson-complete__checkmark {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.lesson-complete input:checked + .lesson-complete__checkmark {
    background-color: #22C55E;
    border-color: #22C55E;
}

.lesson-complete input:checked + .lesson-complete__checkmark::after {
    content: '✓';
    color: white;
    font-weight: bold;
}

.lesson-complete__text {
    font-weight: 500;
}

/* Navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--space-4);
}

.btn--outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Sidebar */
.lesson-sidebar {
    background-color: var(--color-bg);
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 60px);
    overflow: hidden;
}

.lesson-sidebar__title {
    font-size: var(--text-lg);
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.lesson-sidebar__progress {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.lesson-sidebar__progress span {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--space-2);
}

.progress-bar {
    height: 6px;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.lesson-sidebar__list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

/* Sidebar Item */
.sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2);
    transition: background-color var(--transition-fast);
}

.sidebar-item:hover {
    background-color: var(--color-bg-alt);
}

.sidebar-item--active {
    background-color: var(--color-badge-pink);
}

.sidebar-item__icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.sidebar-item--active .sidebar-item__icon {
    background-color: var(--color-primary);
    color: white;
}

.sidebar-item__icon.completed {
    background-color: #22C55E;
    color: white;
}

.sidebar-item__info {
    flex: 1;
    min-width: 0;
}

.sidebar-item__title {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-item__duration {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* Mobile Sidebar Toggle */
.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 60;
    cursor: pointer;
}

/* Mobile Responsive - Lesson Player */
@media (max-width: 1024px) {
    .lesson-layout {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: fixed;
        right: -350px;
        top: 60px;
        width: 350px;
        height: calc(100vh - 60px);
        transition: right var(--transition-base);
        z-index: 50;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    }

    .lesson-sidebar.open {
        right: 0;
    }

    .sidebar-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .lesson-header__title {
        display: none;
    }

    .lesson-info {
        padding: var(--space-6);
    }

    .lesson-nav {
        flex-direction: column;
    }

    .lesson-sidebar {
        width: 100%;
        right: -100%;
    }
}

/* --------------------------------------------------------------------------
   Profile Page Styles
   -------------------------------------------------------------------------- */
.profile-page {
    padding-top: calc(70px + var(--space-10));
    padding-bottom: var(--space-16);
    min-height: 100vh;
    background-color: var(--color-bg-alt);
}

.profile-header {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    background-color: var(--color-bg);
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-8);
}

.profile-header__avatar {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-3xl);
    font-weight: 600;
    flex-shrink: 0;
}

.profile-header__name {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-1);
}

.profile-header__email {
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}

.profile-header__joined {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* Stats Cards */
.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

.stat-card {
    background-color: var(--color-bg);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    text-align: center;
}

.stat-card__value {
    display: block;
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.stat-card__label {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* Enrolled Courses */
.profile-courses__title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-6);
}

.profile-courses__empty {
    text-align: center;
    padding: var(--space-16);
    background-color: var(--color-bg);
    border-radius: var(--radius-2xl);
}

.profile-courses__empty p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.profile-courses__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-6);
}

.enrolled-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.enrolled-card__image {
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.enrolled-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.enrolled-card__content {
    padding: var(--space-6);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.enrolled-card__title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.enrolled-card__progress {
    margin-bottom: var(--space-4);
}

.enrolled-card__progress span {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
}

.enrolled-card .btn {
    margin-top: auto;
    align-self: flex-start;
}

/* Responsive - Profile Page */
@media (max-width: 768px) {
    .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .profile-stats {
        grid-template-columns: 1fr;
    }

    .profile-courses__grid {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.05);
    }
}

.experience__play-btn {
    animation: pulse 2s ease-in-out infinite;
}

.experience__play-btn:hover {
    animation: none;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* --------------------------------------------------------------------------
   Zalo Floating Chat Button
   -------------------------------------------------------------------------- */
.zalo-float {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 60px;
    height: 60px;
    min-width: 60px;
    min-height: 60px;
    max-width: 60px;
    max-height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 104, 255, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 9999;
    animation: zalo-pulse 2s infinite;
    overflow: hidden;
}

.zalo-float img,
.zalo-float svg {
    width: 60px;
    height: 60px;
    max-width: 60px;
    max-height: 60px;
    object-fit: contain;
    border-radius: 50%;
}

.zalo-float:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 28px rgba(0, 104, 255, 0.5);
    animation: none;
}

.zalo-float__tooltip {
    position: absolute;
    right: 72px;
    background: #1A1A2E;
    color: white;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-family: var(--font-body);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: all 0.3s ease;
}

.zalo-float__tooltip::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    border: 6px solid transparent;
    border-left-color: #1A1A2E;
}

.zalo-float:hover .zalo-float__tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

@keyframes zalo-pulse {
    0%, 100% {
        box-shadow: 0 4px 20px rgba(0, 104, 255, 0.4);
    }
    50% {
        box-shadow: 0 4px 30px rgba(0, 104, 255, 0.6);
    }
}

/* Mobile responsive */
@media (max-width: 768px) {
    .zalo-float {
        bottom: 16px;
        right: 16px;
        width: 52px;
        height: 52px;
    }

    .zalo-float img,
    .zalo-float svg {
        width: 52px;
        height: 52px;
    }

    .zalo-float__tooltip {
        display: none;
    }
}