/* Interactive AI — chat-hero + secondary grid
   Prefix: ia-
   Light theme. The chat IS the hero; the model grid is the secondary content.
*/
:root {
    --ia-bg: #fafafa;
    --ia-bg-soft: #ffffff;
    --ia-rose: #e8336d;
    --ia-rose-soft: #fce7ee;
    --ia-purple: #8b5cf6;
    --ia-text: #1a1a1a;
    --ia-text-dim: #6b7280;
    --ia-bubble-user: #e8336d;
    --ia-bubble-user-text: #ffffff;
    --ia-bubble-model: #ffffff;
    --ia-bubble-model-text: #1a1a1a;
    --ia-border: #e5e7eb;
    --ia-card-shadow: 0 4px 18px rgba(0,0,0,0.06);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    background: var(--ia-bg);
    color: var(--ia-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}
.ia-topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--ia-border);
}
.ia-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ia-text);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
}
.ia-logo img { width: 28px; height: 28px; }
.ia-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.ia-nav a {
    color: var(--ia-text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.ia-nav a:hover { color: var(--ia-rose); }
.ia-nav a.ia-active { color: var(--ia-rose); font-weight: 600; }

.ia-hero {
    padding: 48px 24px 28px;
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}
.ia-hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    margin: 0 0 14px;
    color: var(--ia-text);
    font-weight: 800;
    letter-spacing: -0.02em;
}
.ia-hero h1 em {
    font-style: normal;
    background: linear-gradient(135deg, var(--ia-rose), var(--ia-purple));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.ia-hero p {
    color: var(--ia-text-dim);
    font-size: 1.1rem;
    margin: 0 auto;
    max-width: 580px;
}

.ia-chat {
    max-width: 540px;
    margin: 32px auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.ia-bubble {
    padding: 14px 18px;
    border-radius: 20px;
    max-width: 78%;
    line-height: 1.5;
    font-size: 1rem;
    box-shadow: var(--ia-card-shadow);
    word-wrap: break-word;
}
.ia-bubble-model {
    align-self: flex-start;
    background: var(--ia-bubble-model);
    color: var(--ia-bubble-model-text);
    border-bottom-left-radius: 6px;
}
.ia-bubble-user {
    align-self: flex-end;
    background: var(--ia-bubble-user);
    color: var(--ia-bubble-user-text);
    border-bottom-right-radius: 6px;
}
.ia-bubble-cta {
    align-self: center;
    background: linear-gradient(135deg, var(--ia-rose), var(--ia-purple));
    color: white;
    border-radius: 999px;
    padding: 14px 32px;
    text-decoration: none;
    font-weight: 700;
    margin-top: 16px;
    box-shadow: 0 8px 24px rgba(232,51,109,0.3);
    transition: transform 0.15s;
}
.ia-bubble-cta:hover { transform: translateY(-2px); }
.ia-bubble-meta {
    align-self: center;
    font-size: 0.78rem;
    color: var(--ia-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 18px;
}

.ia-grid {
    max-width: 1200px;
    margin: 60px auto 40px;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 18px;
}
.ia-grid-title {
    grid-column: 1 / -1;
    text-align: center;
    margin-bottom: 8px;
}
.ia-grid-title h2 {
    font-size: 1.5rem;
    margin: 0 0 8px;
}
.ia-grid-title p {
    color: var(--ia-text-dim);
    margin: 0;
    font-size: 0.95rem;
}
.ia-tile {
    background: var(--ia-bg-soft);
    border: 1px solid var(--ia-border);
    border-radius: 14px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition: transform 0.18s, box-shadow 0.18s;
    display: flex;
    flex-direction: column;
}
.ia-tile:hover {
    transform: translateY(-3px);
    box-shadow: var(--ia-card-shadow);
}
.ia-tile img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    display: block;
}
.ia-tile-body {
    padding: 12px 14px;
}
.ia-tile-name {
    font-weight: 700;
    margin: 0 0 4px;
    font-size: 1rem;
}
.ia-tile-arch {
    font-size: 0.78rem;
    color: var(--ia-rose);
    font-weight: 600;
}

.ia-faq {
    max-width: 760px;
    margin: 60px auto 40px;
    padding: 0 24px;
}
.ia-faq h2 {
    text-align: center;
    font-size: 1.5rem;
    margin: 0 0 24px;
}
.ia-faq-item {
    background: var(--ia-bg-soft);
    border: 1px solid var(--ia-border);
    border-radius: 12px;
    padding: 18px 22px;
    margin-bottom: 12px;
}
.ia-faq-q {
    font-weight: 700;
    margin: 0 0 6px;
    color: var(--ia-text);
}
.ia-faq-a {
    color: var(--ia-text-dim);
    margin: 0;
    font-size: 0.95rem;
}

.ia-footer {
    text-align: center;
    padding: 40px 22px;
    border-top: 1px solid var(--ia-border);
    color: var(--ia-text-dim);
    font-size: 0.85rem;
    margin-top: 60px;
}
.ia-footer a { color: var(--ia-text-dim); text-decoration: none; margin: 0 8px; }
.ia-footer a:hover { color: var(--ia-rose); }


.ia-topbar .ia-brand {
    color: var(--ia-text);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    font-family: Arial, Helvetica, "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Liberation Sans", system-ui, sans-serif !important;
    letter-spacing: -0.01em;
}


/* === Universal responsive nav (single-row desktop, hamburger drawer <=1024px) === */

/* Hamburger button - hidden on desktop */
.ia-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 8px;
    color: inherit;
    cursor: pointer;
    flex-shrink: 0;
    margin-left: auto;
    position: relative;
    transition: background 0.15s;
}
.ia-menu-btn svg {
    width: 22px;
    height: 22px;
    display: block;
}
.ia-menu-btn:hover {
    background: rgba(0,0,0,0.06);
}
.ia-menu-btn-open {
    background: rgba(0,0,0,0.08);
}
.ia-menu-btn-close {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.15s;
}
.ia-menu-btn-open .ia-menu-btn-close {
    opacity: 1;
}
.ia-menu-btn-open > svg:not(.ia-menu-btn-close) {
    opacity: 0;
}

/* Desktop (>=1025px): single-row nav, no wrap, hamburger hidden */
@media (min-width: 1025px) {
    .ia-topbar {
        display: flex !important;
        align-items: center !important;
        flex-wrap: nowrap !important;
        gap: 16px !important;
    }
    .ia-topbar > * {
        flex-shrink: 0;
    }
    .ia-topbar .ia-nav {
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        align-items: center;
        gap: 12px;
        margin-left: auto !important;
        padding: 0 !important;
        background: transparent !important;
        border: none !important;
        margin-top: 0 !important;
        width: auto !important;
        flex-basis: auto !important;
    }
    .ia-topbar .ia-nav a {
        white-space: nowrap;
        padding: 0 !important;
        border: none !important;
        width: auto !important;
        display: inline-block !important;
        font-size: 0.85rem;
    }
    .ia-menu-btn {
        display: none !important;
    }
}

/* Tablet + mobile (<=1024px): hamburger visible, nav drawer */
@media (max-width: 1024px) {
    .ia-topbar {
        display: flex !important;
        flex-wrap: wrap !important;
        align-items: center;
        gap: 10px;
    }
    .ia-menu-btn {
        display: flex !important;
    }
    .ia-topbar .ia-nav {
        display: none !important;
        flex-direction: column !important;
        width: 100% !important;
        flex-basis: 100% !important;
        gap: 0 !important;
        margin: 12px 0 0 0 !important;
        padding: 12px 0 0 0 !important;
        border-top: 1px solid rgba(0,0,0,0.08);
    }
    .ia-topbar .ia-nav..ia-nav-open {
        display: flex !important;
    }
    .ia-topbar .ia-nav a {
        padding: 12px 0 !important;
        white-space: normal;
        border-bottom: 1px solid rgba(0,0,0,0.05) !important;
        width: 100% !important;
        display: block !important;
    }
    .ia-topbar .ia-nav a:last-child {
        border-bottom: none !important;
    }
}