/* ============ DESIGN TOKENS ============ */
:root {
    --bg-deep: #0a0a0f;
    --bg-card: #111118;
    --bg-elevated: #1a1a24;
    --bg-input: #0f0f16;
    --amber: #f59e0b;
    --amber-glow: #f59e0b33;
    --amber-light: #fbbf24;
    --amber-dark: #d97706;
    --blue: #3b82f6;
    --blue-glow: #3b82f633;
    --green: #10b981;
    --green-glow: #10b98133;
    --red: #ef4444;
    --text-primary: #f0f0f5;
    --text-secondary: #9898a8;
    --text-muted: #6b6b7b;
    --border: #2a2a38;
    --border-light: #363648;
    --gradient-amber: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --gradient-blue: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-green: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    min-height: 100vh;
}

h1, h2, h3, h4 { font-family: 'Space Grotesk', sans-serif; }

a { color: var(--amber); text-decoration: none; }
a:hover { color: var(--amber-light); }

/* ============ NAVIGATION ============ */
.app-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
}

.nav-brand {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-brand .highlight { color: var(--amber); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
    cursor: pointer;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-link.active {
    color: var(--amber);
    background: var(--amber-glow);
}

.nav-btn {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    background: var(--gradient-amber);
    color: #000;
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
}

.nav-btn:hover { opacity: 0.9; color: #000; }

.lang-toggle {
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lang-toggle:hover {
    color: var(--text-primary);
    border-color: var(--border-light);
}

/* ============ MAIN CONTENT ============ */
main {
    padding-top: 64px;
    min-height: 100vh;
}

/* ============ LOADING ============ */
.loading-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 64px);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--amber);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============ AUTH PAGES ============ */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 64px);
    padding: 40px 24px;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
}

.auth-card h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.auth-card .subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    transition: border-color 0.2s;
    outline: none;
}

.form-group input:focus {
    border-color: var(--amber);
}

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

.auth-btn {
    width: 100%;
    padding: 14px;
    background: var(--gradient-amber);
    border: none;
    border-radius: var(--radius-sm);
    color: #000;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    margin-top: 8px;
}

.auth-btn:hover { opacity: 0.9; }
.auth-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--amber);
    font-weight: 500;
}

.auth-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 14px;
    color: #fca5a5;
}

/* ============ ACADEMY PAGE ============ */
.academy-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.academy-hero {
    text-align: center;
    margin-bottom: 56px;
    position: relative;
}

.academy-hero::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 400px;
    background: radial-gradient(circle, var(--amber-glow) 0%, transparent 70%);
    pointer-events: none;
}

.academy-hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    position: relative;
}

.academy-hero h1 .highlight {
    background: var(--gradient-amber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.academy-hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 560px;
    margin: 0 auto 24px;
    position: relative;
}

.academy-free-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 100px;
    padding: 6px 16px;
    font-size: 13px;
    color: var(--green);
    font-weight: 500;
}

/* Pillar Filter */
.pillar-filter {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-light);
}

.filter-btn.active {
    background: var(--amber-glow);
    color: var(--amber);
    border-color: var(--amber);
}

/* Course Cards */
.courses-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.course-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 32px;
    display: grid;
    grid-template-columns: 72px 1fr auto;
    gap: 24px;
    align-items: start;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
}

.course-card.pillar-funnel::before { background: var(--gradient-amber); }
.course-card.pillar-product::before { background: var(--gradient-blue); }
.course-card.pillar-traffic::before { background: var(--gradient-green); }

.course-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.course-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.course-icon.amber { background: linear-gradient(135deg, #f59e0b22 0%, #f59e0b11 100%); border: 1px solid #f59e0b33; }
.course-icon.blue { background: linear-gradient(135deg, #3b82f622 0%, #3b82f611 100%); border: 1px solid #3b82f633; }
.course-icon.green { background: linear-gradient(135deg, #10b98122 0%, #10b98111 100%); border: 1px solid #10b98133; }

.course-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.course-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.course-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-action {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    min-width: 120px;
}

.course-progress-bar {
    width: 120px;
    height: 4px;
    background: var(--bg-elevated);
    border-radius: 2px;
    overflow: hidden;
}

.course-progress-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.3s;
}

.course-progress-fill.amber { background: var(--amber); }
.course-progress-fill.blue { background: var(--blue); }
.course-progress-fill.green { background: var(--green); }

.course-progress-text {
    font-size: 12px;
    color: var(--text-muted);
}

.course-start-btn {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.course-start-btn:hover {
    border-color: var(--amber);
    color: var(--amber);
}

/* ============ COURSE / LESSON PAGE ============ */
.lesson-page {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: calc(100vh - 64px);
}

.lesson-sidebar {
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: 24px 0;
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    overflow-y: auto;
}

.sidebar-header {
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

.sidebar-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
    cursor: pointer;
}

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

.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.sidebar-progress {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

.sidebar-progress-bar {
    flex: 1;
    height: 3px;
    background: var(--bg-elevated);
    border-radius: 2px;
    overflow: hidden;
}

.sidebar-progress-fill {
    height: 100%;
    background: var(--amber);
    border-radius: 2px;
    transition: width 0.3s;
}

.lesson-list {
    list-style: none;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    cursor: pointer;
    transition: background 0.15s;
    font-size: 14px;
    color: var(--text-secondary);
    border-left: 2px solid transparent;
}

.lesson-item:hover {
    background: var(--bg-elevated);
}

.lesson-item.active {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-left-color: var(--amber);
}

.lesson-item.completed {
    color: var(--text-muted);
}

.lesson-check {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 11px;
}

.lesson-item.completed .lesson-check {
    background: var(--green);
    border-color: var(--green);
    color: #fff;
}

.lesson-item.active .lesson-check {
    border-color: var(--amber);
}

.lesson-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lesson-item-duration {
    font-size: 12px;
    color: var(--text-muted);
    flex-shrink: 0;
}

/* ============ LESSON CONTENT ============ */
.lesson-content-area {
    padding: 48px;
    max-width: 780px;
}

.lesson-breadcrumb {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.lesson-content-area h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.lesson-meta-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    font-size: 13px;
    color: var(--text-muted);
}

/* Markdown content styling */
.lesson-body {
    line-height: 1.8;
    color: var(--text-secondary);
}

.lesson-body h1 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin: 40px 0 16px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.lesson-body h1:first-child {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

.lesson-body h2 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin: 32px 0 12px;
}

.lesson-body h3 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin: 24px 0 8px;
}

.lesson-body p {
    margin-bottom: 16px;
}

.lesson-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.lesson-body ul, .lesson-body ol {
    margin: 12px 0 20px;
    padding-left: 24px;
}

.lesson-body li {
    margin-bottom: 6px;
}

.lesson-body blockquote {
    border-left: 3px solid var(--amber);
    padding: 12px 20px;
    margin: 20px 0;
    background: var(--bg-elevated);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-primary);
}

.lesson-body code {
    background: var(--bg-elevated);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.lesson-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.lesson-body th, .lesson-body td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.lesson-body th {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lesson-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}

/* Lesson Actions */
.lesson-actions {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.complete-btn {
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.complete-btn.incomplete {
    background: var(--gradient-amber);
    color: #000;
}

.complete-btn.incomplete:hover { opacity: 0.9; }

.complete-btn.done {
    background: var(--green-glow);
    color: var(--green);
    border: 1px solid var(--green);
}

.lesson-nav-btns {
    display: flex;
    gap: 8px;
}

.lesson-nav-btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.lesson-nav-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-light);
}

.lesson-nav-btn.primary {
    background: var(--bg-elevated);
    color: var(--amber);
    border-color: var(--amber);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
    .lesson-page {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: relative;
        top: 0;
        height: auto;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .lesson-content-area {
        padding: 32px 20px;
    }

    .course-card {
        grid-template-columns: 56px 1fr;
        gap: 16px;
    }

    .course-action {
        grid-column: 1 / -1;
        flex-direction: row;
        align-items: center;
    }

    .auth-card {
        padding: 36px 24px;
    }

    .lesson-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .lesson-nav-btns {
        justify-content: space-between;
    }

    .app-nav {
        padding: 0 16px;
    }

    .nav-links {
        gap: 4px;
    }

    .nav-link {
        padding: 6px 10px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .academy-page {
        padding: 32px 16px 60px;
    }

    .course-card {
        padding: 24px 20px;
    }

    .pillar-filter {
        gap: 6px;
    }

    .filter-btn {
        padding: 6px 14px;
        font-size: 13px;
    }
}

/* ============ MOBILE SIDEBAR TOGGLE ============ */
.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--amber);
    color: #000;
    border: none;
    font-size: 20px;
    cursor: pointer;
    z-index: 50;
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex;
    }
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}