/* ============================================================
   AI Sergey Page - parody AI product styling
   ============================================================ */
:root {
    --ai-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --ai-primary: #667eea;
    --ai-secondary: #764ba2;
    --ai-warning-bg: #fffbeb;
    --ai-warning-border: #f59e0b;
}
[data-bs-theme="dark"] {
    --ai-gradient: linear-gradient(135deg, #4c5fcf 0%, #4f2f73 100%);
    --ai-primary: #8b9cf5;
    --ai-warning-bg: #2a2210;
    --ai-warning-border: #b7791f;
}

/* ---------- Hero ---------- */
.ai-hero {
    background: var(--ai-gradient);
    color: #fff;
    padding: calc(var(--nav-height) + 4rem) 0 5rem;
    position: relative;
    overflow: hidden;
}
.ai-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.12) 1px, transparent 1px),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
    background-size: 50px 50px, 80px 80px;
    opacity: 0.3;
    pointer-events: none;
}
.ai-hero .container { position: relative; z-index: 1; }
.ai-hero h1 { color: #fff; }

.ai-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-block;
}
.ai-hero-title { font-size: 3rem; font-weight: 800; margin-bottom: 1rem; line-height: 1.1; }
.ai-hero-subtitle { font-size: 1.5rem; opacity: 0.95; margin-bottom: 1.5rem; }
.ai-hero-description { font-size: 1.1rem; opacity: 0.9; }
.ai-hero-description a { color: #fff; }
.ai-footnote { color: rgba(255, 255, 255, 0.7); }

.btn-ai-primary {
    background: #fff;
    color: var(--ai-secondary);
    font-weight: 700;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}
.btn-ai-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2); color: var(--ai-secondary); background: #fff; }

.ai-stats {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    padding: 2rem;
    backdrop-filter: blur(10px);
}
.ai-stat-number { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.5rem; font-family: var(--font-heading); }
.ai-stat-label { font-size: 0.9rem; opacity: 0.9; }

/* ---------- Mockup chat window ---------- */
.ai-hero-mockup { perspective: 1000px; }
.mockup-window {
    background: #2d3748;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    transform: rotateY(-5deg) rotateX(5deg);
    transition: transform 0.3s;
    text-align: left;
}
.mockup-window:hover { transform: rotateY(0deg) rotateX(0deg); }
.mockup-header { background: #1a202c; padding: 0.75rem 1rem; display: flex; gap: 0.5rem; align-items: center; }
.mockup-dot { width: 12px; height: 12px; border-radius: 50%; background: #4a5568; }
.mockup-dot:nth-child(1) { background: #fc605b; }
.mockup-dot:nth-child(2) { background: #fdbc40; }
.mockup-dot:nth-child(3) { background: #34c84a; }
.mockup-title { margin-left: auto; color: #a0aec0; font-size: 0.8rem; font-family: var(--bs-font-monospace); }
.mockup-body { padding: 1.5rem; min-height: 250px; display: flex; flex-direction: column; }
.chat-message {
    background: #4a5568;
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    margin-bottom: 0.75rem;
    max-width: 85%;
}
.chat-message.user { background: #4299e1; margin-left: auto; text-align: right; border-bottom-right-radius: 4px; }
.chat-message.ai { background: var(--ai-primary); border-bottom-left-radius: 4px; }
.js [data-chat] .chat-message { opacity: 0; transform: translateY(10px); transition: opacity 0.35s ease, transform 0.35s ease; }
.js [data-chat] .chat-message.is-shown { opacity: 1; transform: none; }
.chat-typing { display: none; gap: 4px; padding: 0.5rem 0.25rem; }
.chat-typing.is-shown { display: inline-flex; }
.chat-typing span { width: 7px; height: 7px; border-radius: 50%; background: #a0aec0; animation: blink 1s infinite ease-in-out; }
.chat-typing span:nth-child(2) { animation-delay: 0.15s; }
.chat-typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes blink { 0%, 80%, 100% { opacity: 0.3; } 40% { opacity: 1; } }

/* ---------- Cards ---------- */
.ai-feature-card,
.ai-pricing-card,
.ai-testimonial-card {
    background: var(--surface-raised);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    height: 100%;
}
.ai-feature-card:hover, .ai-pricing-card:hover, .ai-testimonial-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.ai-feature-card { padding: 2rem; }
.ai-feature-warning { border: 2px solid var(--ai-warning-border); background: var(--ai-warning-bg); }
.ai-feature-icon { font-size: 2.5rem; margin-bottom: 1rem; line-height: 1; }
.ai-feature-icon i { color: var(--ai-primary); }
.ai-feature-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.75rem; }
.ai-limitation-tag {
    display: inline-block;
    margin-right: 0.5rem;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    background: var(--ai-warning-border);
    color: #1a202c;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    vertical-align: middle;
}
.ai-feature-desc { color: var(--text); margin-bottom: 0; }

/* Pricing */
.ai-pricing-card { overflow: hidden; position: relative; display: flex; flex-direction: column; }
.ai-pricing-featured { border: 3px solid var(--ai-primary); }
@media (min-width: 992px) {
    .ai-pricing-featured { transform: scale(1.04); }
    .ai-pricing-featured:hover { transform: scale(1.04) translateY(-5px); }
}
.ai-pricing-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--ai-gradient);
    color: #fff;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
}
.ai-pricing-header { padding: 2rem 2rem 1rem; text-align: center; background: linear-gradient(to bottom, var(--surface-alt), var(--surface-raised)); }
.ai-pricing-header h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
.ai-pricing-price { margin-bottom: 1rem; }
.ai-pricing-price .price { font-size: clamp(1.6rem, 2.2vw + 0.8rem, 2.5rem); font-weight: 800; color: var(--ai-primary); font-family: var(--font-heading); overflow-wrap: anywhere; }
.ai-pricing-price .period { font-size: 1rem; color: var(--text-muted); }
.ai-pricing-body { padding: 0 2rem 2rem; flex-grow: 1; }
.ai-pricing-body ul { list-style: none; padding: 0; margin: 0; }
.ai-pricing-body li { padding: 0.5rem 0; color: var(--text); }
.ai-pricing-body li::before { content: "✓"; color: var(--ai-primary); font-weight: bold; margin-right: 0.6rem; }
.ai-pricing-footer { padding: 0 2rem 2rem; }

/* Testimonials */
.ai-testimonial-card { padding: 2rem; margin: 0; }
.ai-rating { font-size: 1.1rem; color: #f5a623; letter-spacing: 0.1em; }
.ai-testimonial-text { font-style: italic; color: var(--text); margin-bottom: 1rem; font-size: 1.05rem; }
.ai-testimonial-author strong { color: var(--heading); }

/* API docs */
.ai-api-intro {
    background: var(--surface-raised);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    border-left: 4px solid var(--ai-primary);
}
.ai-api-intro p:last-child { margin-bottom: 0; }
.ai-code-block { background: #1e2533; border-radius: 12px; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.06); }
.code-header { background: #151b26; padding: 0.75rem 1rem; display: flex; justify-content: space-between; align-items: center; color: #a0aec0; font-size: 0.875rem; }
.btn-copy {
    background: transparent;
    border: 1px solid #4a5568;
    color: #a0aec0;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-copy:hover { background: #4a5568; color: #fff; }
.ai-code-block pre { margin: 0; padding: 1.5rem; overflow-x: auto; }
.ai-code-block code { color: #e2e8f0; font-family: var(--bs-font-monospace); font-size: 0.9rem; line-height: 1.6; }

/* CTA */
.ai-cta { background: var(--ai-gradient); }
.ai-cta h2 { color: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
    .ai-hero { padding: calc(var(--nav-height) + 2.5rem) 0 4rem; }
    .ai-hero-title { font-size: 2.25rem; }
    .ai-hero-subtitle { font-size: 1.25rem; }
    .ai-stat-number { font-size: 2rem; }
    .mockup-window { transform: none; }
}
@media (max-width: 767.98px) {
    .ai-hero-title { font-size: 1.85rem; }
    .ai-hero-subtitle { font-size: 1.1rem; }
    .ai-hero-cta .btn { display: block; width: 100%; margin-bottom: 0.5rem; }
    .ai-stats { padding: 1.5rem; }
    .ai-stat-number { font-size: 1.75rem; }
    .ai-stat-label { font-size: 0.8rem; }
}