/* Patrik Solutions AI Course Platform */

:root {
    --ai-primary: #6366f1;
    --ai-primary-dark: #4f46e5;
    --ai-secondary: #8b5cf6;
    --ai-accent: #06b6d4;
    --ai-dark: #0f172a;
    --ai-dark-soft: #1e293b;
    --ai-surface: #ffffff;
    --ai-muted: #64748b;
    --ai-border: #e2e8f0;
    --ai-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --ai-gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
    --ai-glow: 0 0 40px rgba(99, 102, 241, 0.25);
}

.ai-body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f8fafc;
    color: #0f172a;
    min-height: 100vh;
}

.ai-navbar {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 0.875rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.ai-navbar .navbar-brand {
    font-weight: 800;
    font-size: 1.125rem;
    color: #fff !important;
    letter-spacing: -0.02em;
}

.ai-navbar .nav-link {
    color: rgba(255, 255, 255, 0.75) !important;
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 0.5rem 0.875rem !important;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.ai-navbar .nav-link:hover,
.ai-navbar .nav-link.active {
    color: #fff !important;
    background: rgba(99, 102, 241, 0.2);
}

.ai-hero {
    background: var(--ai-gradient-dark);
    color: #fff;
    padding: 5rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.ai-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.2) 0%, transparent 40%),
        radial-gradient(circle at 60% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 40%);
    pointer-events: none;
}

.ai-hero-content {
    position: relative;
    z-index: 1;
}

.ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(99, 102, 241, 0.2);
    border: 1px solid rgba(99, 102, 241, 0.4);
    color: #a5b4fc;
    padding: 0.375rem 0.875rem;
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.ai-hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1.25rem;
    color: #fff;
}

.ai-hero p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 540px;
    line-height: 1.7;
}

.ai-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ai-btn-primary {
    background: var(--ai-gradient);
    color: #fff;
    box-shadow: var(--ai-glow);
}

.ai-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.4);
    color: #fff;
}

.ai-btn-outline {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.ai-btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.ai-btn-dark {
    background: var(--ai-dark);
    color: #fff;
}

.ai-btn-dark:hover {
    background: var(--ai-dark-soft);
    color: #fff;
}

.ai-section {
    padding: 4rem 0;
}

.ai-section-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.ai-section-subtitle {
    color: var(--ai-muted);
    font-size: 1.0625rem;
    margin-bottom: 2.5rem;
}

.ai-card {
    background: var(--ai-surface);
    border: 1px solid var(--ai-border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.25s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.ai-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
    border-color: rgba(99, 102, 241, 0.3);
}

.ai-card-image {
    height: 180px;
    background: var(--ai-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.ai-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ai-card-body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.ai-level-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ai-level-beginner { background: #dcfce7; color: #166534; }
.ai-level-intermediate { background: #fef3c7; color: #92400e; }
.ai-level-advanced { background: #fce7f3; color: #9d174d; }

.ai-progress-bar {
    height: 6px;
    background: #e2e8f0;
    border-radius: 999px;
    overflow: hidden;
}

.ai-progress-fill {
    height: 100%;
    background: var(--ai-gradient);
    border-radius: 999px;
    transition: width 0.4s ease;
}

.ai-lesson-layout {
    display: grid;
    grid-template-columns: 280px 1fr 360px;
    gap: 0;
    min-height: calc(100vh - 64px);
}

@media (max-width: 1200px) {
    .ai-lesson-layout {
        grid-template-columns: 1fr;
    }
    .ai-lesson-sidebar,
    .ai-tutor-panel {
        display: none;
    }
}

.ai-lesson-sidebar {
    background: var(--ai-dark);
    color: #fff;
    overflow-y: auto;
    border-right: 1px solid rgba(255,255,255,0.08);
}

.ai-lesson-main {
    background: #fff;
    overflow-y: auto;
    padding: 2rem;
}

.ai-tutor-panel {
    background: #f8fafc;
    border-left: 1px solid var(--ai-border);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 64px);
}

.ai-tutor-header {
    padding: 1rem 1.25rem;
    background: var(--ai-gradient);
    color: #fff;
    font-weight: 700;
}

.ai-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.ai-chat-bubble {
    max-width: 90%;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-size: 0.875rem;
    line-height: 1.5;
}

.ai-chat-bubble.user {
    background: var(--ai-primary);
    color: #fff;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.ai-chat-bubble.assistant {
    background: #fff;
    border: 1px solid var(--ai-border);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.ai-chat-input-area {
    padding: 1rem;
    border-top: 1px solid var(--ai-border);
    background: #fff;
}

.ai-lesson-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.ai-lesson-item:hover,
.ai-lesson-item.active {
    background: rgba(99, 102, 241, 0.15);
    color: #fff;
    border-left-color: var(--ai-primary);
}

.ai-lesson-item.completed .ai-lesson-check {
    color: #34d399;
}

.ai-feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.ai-feature-item {
    padding: 1.5rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
}

.ai-feature-item i {
    font-size: 1.5rem;
    color: #a5b4fc;
    margin-bottom: 0.75rem;
}

.ai-stat-card {
    text-align: center;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--ai-border);
}

.ai-stat-card h3 {
    font-size: 2rem;
    font-weight: 800;
    background: var(--ai-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.ai-content-body {
    line-height: 1.8;
    color: #334155;
}

.ai-content-body h2, .ai-content-body h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.ai-content-body ul, .ai-content-body ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.ai-content-body li {
    margin-bottom: 0.375rem;
}

.ai-footer {
    background: var(--ai-dark);
    color: rgba(255,255,255,0.6);
    padding: 2rem 0;
    font-size: 0.875rem;
}

.ai-footer a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
}

.ai-footer a:hover {
    color: #fff;
}

.ai-video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    background: #000;
    margin-bottom: 1.5rem;
}

.ai-video-wrapper iframe,
.ai-video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Auth pages */
.ai-auth-section {
    padding: 3rem 0 4rem;
    min-height: calc(100vh - 180px);
    background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
}

.ai-auth-card {
    background: #fff;
    border: 1px solid var(--ai-border);
    border-radius: 16px;
    padding: 2rem 2rem 1.75rem;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

.ai-auth-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--ai-gradient);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.375rem;
    margin: 0 auto 1.25rem;
}

.ai-auth-title {
    font-size: 1.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.375rem;
    letter-spacing: -0.02em;
}

.ai-auth-subtitle {
    text-align: center;
    color: var(--ai-muted);
    font-size: 0.9375rem;
    margin-bottom: 1.75rem;
    line-height: 1.6;
}

.ai-form-label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.375rem;
    color: #0f172a;
}

.ai-form-control {
    display: block;
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    border: 1px solid var(--ai-border);
    border-radius: 10px;
    background: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.ai-form-control:focus {
    outline: none;
    border-color: var(--ai-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.ai-form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--ai-muted);
}

.ai-form-error {
    color: #ef4444;
    font-size: 0.8125rem;
    margin-top: 0.375rem;
}

.ai-auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    color: var(--ai-muted);
    font-size: 0.8125rem;
    position: relative;
}

.ai-auth-divider::before,
.ai-auth-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 42%;
    height: 1px;
    background: var(--ai-border);
}

.ai-auth-divider::before { left: 0; }
.ai-auth-divider::after { right: 0; }

.ai-auth-link {
    color: var(--ai-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
}

.ai-auth-link:hover {
    color: var(--ai-primary-dark);
    text-decoration: underline;
}

.ai-profile-card {
    background: #fff;
    border: 1px solid var(--ai-border);
    border-radius: 16px;
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

.ai-profile-card h2 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.ai-profile-card p.text-muted {
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
}

.ai-btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.ai-btn-danger:hover {
    background: #ef4444;
    color: #fff;
}