/* ==========================================================================
   Glow & Commercial — Online Course Platform
   Color scheme: soft pink / rose gold beauty-themed design
   Mobile-first, card-based layout
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
    --color-bg: #fdf6f3;
    --color-surface: #ffffff;
    --color-primary: #d4a373;
    --color-primary-dark: #b8884f;
    --color-primary-light: #f8e8e0;
    --color-accent: #e8c4b8;
    --color-accent-light: #f8e8e0;
    --color-text: #3d2c2c;
    --color-text-muted: #7a6565;
    --color-border: #f0ddd5;
    --color-link: #c47d52;
    --color-link-hover: #a0603a;
    --color-danger: #d94f4f;
    --color-success: #5aab61;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(61, 44, 44, 0.08);
    --shadow-md: 0 4px 12px rgba(61, 44, 44, 0.1);
    --shadow-lg: 0 8px 30px rgba(61, 44, 44, 0.12);
    --shadow-hover: 0 4px 20px rgba(180, 140, 110, 0.2);
    --transition: 0.2s ease;
    --container-max: 960px;
    --header-height: 64px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-link-hover);
}

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

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: 1.8rem; margin-bottom: 0.6em; }
h2 { font-size: 1.4rem; margin-bottom: 0.5em; }
h3 { font-size: 1.15rem; margin-bottom: 0.4em; }

/* ---------- Container ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    letter-spacing: -0.02em;
}

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

.header-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-name {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    background-color: var(--color-primary);
    color: #fff;
}

.btn:hover {
    background-color: var(--color-primary-dark);
    color: #fff;
    box-shadow: var(--shadow-hover);
}

.btn:active {
    transform: scale(0.98);
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.btn-sm:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-color: var(--color-accent);
}

/* ---------- Main content ---------- */
main.container {
    flex: 1;
    padding-top: 32px;
    padding-bottom: 48px;
}

/* ---------- Login Section ---------- */
.login-section {
    text-align: center;
    padding: 80px 20px 60px;
    max-width: 520px;
    margin: 0 auto;
}

.login-section h1 {
    font-size: 2.2rem;
    color: var(--color-primary-dark);
    margin-bottom: 16px;
    letter-spacing: -0.03em;
}

.login-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    line-height: 1.6;
}

.login-widget {
    margin: 32px 0;
    display: flex;
    justify-content: center;
}

.login-note {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 24px;
}

/* ---------- Dashboard ---------- */
.dashboard {
    max-width: var(--container-max);
}

.dashboard h1 {
    font-size: 1.8rem;
    margin-bottom: 28px;
    color: var(--color-primary-dark);
}

/* ---------- Course Section ---------- */
.course-section {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 28px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.course-section h2 {
    font-size: 1.4rem;
    color: var(--color-primary-dark);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-primary-light);
    margin-bottom: 20px;
}

/* ---------- Module ---------- */
.module {
    margin-bottom: 24px;
}

.module:last-child {
    margin-bottom: 0;
}

.module h3 {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    font-weight: 600;
}

/* ---------- Lesson List ---------- */
.lesson-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.lesson-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.lesson-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-1px);
}

.lesson-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background-color 0.15s ease;
}

.lesson-link:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.lesson-title {
    font-weight: 500;
    font-size: 0.95rem;
}

.lesson-duration {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    background: var(--color-primary-light);
    padding: 3px 10px;
    border-radius: 999px;
    white-space: nowrap;
    flex-shrink: 0;
    margin-left: 12px;
}

/* ---------- No Access / No Lessons ---------- */
.no-access {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 40px;
    text-align: center;
}

.no-access p {
    margin-bottom: 12px;
    color: var(--color-text-muted);
    font-size: 1rem;
}

.no-access a {
    font-weight: 600;
    color: var(--color-primary-dark);
}

.no-lessons {
    color: var(--color-text-muted);
    font-style: italic;
    padding: 16px 0;
    font-size: 0.95rem;
}

/* ---------- Access Info ---------- */
.access-info {
    background: var(--color-accent-light);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-md);
    padding: 16px 24px;
    text-align: center;
    margin-top: 8px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.access-info strong {
    color: var(--color-primary-dark);
}

/* ---------- Lesson Viewer ---------- */
.lesson-viewer {
    max-width: 800px;
    margin: 0 auto;
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.back-link:hover {
    color: var(--color-primary-dark);
}

.lesson-viewer h1 {
    font-size: 1.6rem;
    margin-bottom: 12px;
    color: var(--color-text);
}

.lesson-description {
    color: var(--color-text-muted);
    font-size: 1rem;
    margin-bottom: 28px;
    line-height: 1.7;
}

/* ---------- Video Container ---------- */
.video-container {
    position: relative;
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #1a1a1a;
    box-shadow: var(--shadow-lg);
    margin-bottom: 32px;
}

.video-player {
    display: block;
    width: 100%;
    height: auto;
    max-height: 540px;
    outline: none;
}

.video-player::-webkit-media-controls-enclosure {
    border-radius: 0;
}

.no-video {
    background: var(--color-surface);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 60px 20px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1rem;
}

/* ---------- Expired Section ---------- */
.expired-section {
    text-align: center;
    padding: 60px 20px;
    max-width: 520px;
    margin: 0 auto;
}

.expired-section h1 {
    color: var(--color-danger);
    font-size: 1.8rem;
    margin-bottom: 16px;
}

.expired-section p {
    color: var(--color-text-muted);
    margin-bottom: 12px;
    font-size: 1rem;
    line-height: 1.6;
}

.expired-section a {
    font-weight: 600;
    color: var(--color-primary-dark);
}

/* ---------- Footer ---------- */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 24px 0;
    text-align: center;
    margin-top: auto;
}

.site-footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---------- Responsive: Tablet ---------- */
@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.2rem; }

    .login-section {
        padding: 48px 16px 40px;
    }

    .login-section h1 {
        font-size: 1.7rem;
    }

    .login-subtitle {
        font-size: 0.95rem;
    }

    .dashboard h1 {
        font-size: 1.4rem;
    }

    .course-section {
        padding: 20px 16px;
        margin-bottom: 20px;
    }

    .course-section h2 {
        font-size: 1.2rem;
    }

    .lesson-link {
        padding: 12px 14px;
    }

    .lesson-title {
        font-size: 0.9rem;
    }

    .lesson-duration {
        font-size: 0.75rem;
        padding: 2px 8px;
    }

    .video-player {
        max-height: 320px;
    }

    .lesson-viewer h1 {
        font-size: 1.3rem;
    }

    main.container {
        padding-top: 20px;
        padding-bottom: 32px;
    }

    .container {
        padding: 0 16px;
    }
}

/* ---------- Responsive: Mobile ---------- */
@media (max-width: 480px) {
    .logo {
        font-size: 1.05rem;
    }

    .user-name {
        display: none;
    }

    .site-header .container {
        flex-wrap: wrap;
        gap: 8px;
    }

    .header-nav {
        gap: 10px;
    }

    .lesson-link {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .lesson-duration {
        margin-left: 0;
    }

    .course-section {
        padding: 16px 12px;
        border-radius: var(--radius-sm);
    }

    .video-container {
        border-radius: var(--radius-sm);
    }

    .video-player {
        max-height: 240px;
    }

    .no-access {
        padding: 28px 16px;
    }

    .expired-section {
        padding: 40px 16px;
    }
}

/* ---------- Utility ---------- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dashboard,
.lesson-viewer,
.login-section,
.expired-section {
    animation: fadeIn 0.35s ease-out;
}

/* ---------- Selection color ---------- */
::selection {
    background-color: var(--color-accent);
    color: var(--color-text);
}

/* ---------- Scrollbar (WebKit) ---------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* ---------- Focus styles for accessibility ---------- */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

video:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 0;
}