/* AI Terminology slide deck */
.deck-page {
    font-family: 'Inter', sans-serif;
    background-color: #fafbfc;
    background-image: radial-gradient(circle, #d1d5db 1px, transparent 1px);
    background-size: 20px 20px;
    color: #1e293b;
    min-height: 100vh;
}

.deck-wrap {
    max-width: 1120px;
    margin: 0 auto;
    padding: 1.25rem 1.25rem 2.5rem;
}

.deck-hero {
    text-align: center;
    margin-bottom: 1.25rem;
}

.deck-badge {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    color: #2563eb;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    margin-bottom: 0.65rem;
}

.deck-hero h1 {
    font-size: clamp(1.45rem, 3vw, 2.1rem);
    font-weight: 700;
    margin: 0 0 0.4rem;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.deck-hero p {
    color: #64748b;
    margin: 0 auto;
    max-width: 640px;
    font-size: 0.92rem;
}

.deck-stage {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    box-shadow: 0 12px 40px -16px rgba(15, 23, 42, 0.28);
    overflow: hidden;
}

.deck-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.7rem 0.9rem;
    border-bottom: 1px solid #e2e8f0;
    background: #fff;
}

.deck-toolbar-left,
.deck-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-shrink: 0;
}

.deck-title {
    flex: 1;
    min-width: 0;
    text-align: center;
    font-weight: 600;
    font-size: 0.92rem;
    color: #1e293b;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.deck-counter {
    font-size: 0.78rem;
    font-weight: 600;
    color: #2563eb;
    background: rgba(37, 99, 235, 0.08);
    padding: 0.28rem 0.65rem;
    border-radius: 999px;
    white-space: nowrap;
}

.deck-btn {
    width: 40px;
    height: 40px;
    border: 1px solid #e2e8f0;
    background: #fff;
    color: #1e293b;
    border-radius: 10px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.deck-btn:hover:not(:disabled) {
    border-color: #2563eb;
    color: #2563eb;
    background: #eff6ff;
}

.deck-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.deck-btn:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

.deck-frame {
    position: relative;
    background: #0f172a;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.deck-slide {
    display: block;
    width: 100%;
    max-height: calc(100vh - 280px);
    height: auto;
    object-fit: contain;
    background: #0f172a;
    user-select: none;
}

.deck-nav-hit {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 18%;
    max-width: 120px;
    border: none;
    background: transparent;
    cursor: pointer;
    color: transparent;
}

.deck-nav-hit.prev { left: 0; }
.deck-nav-hit.next { right: 0; }

.deck-nav-hit:hover {
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.22), transparent);
}

.deck-nav-hit.next:hover {
    background: linear-gradient(270deg, rgba(15, 23, 42, 0.22), transparent);
}

.deck-nav-hit:disabled {
    cursor: default;
}

.deck-nav-hit:disabled:hover {
    background: transparent;
}

.deck-progress {
    height: 3px;
    background: #e2e8f0;
}

.deck-progress span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, #2563eb, #7c3aed);
    width: 0%;
    transition: width 0.25s ease;
}

.deck-thumbs {
    display: flex;
    gap: 0.45rem;
    overflow-x: auto;
    padding: 0.75rem 0.85rem 0.9rem;
    scrollbar-width: thin;
}

.deck-thumb {
    flex: 0 0 auto;
    width: 96px;
    padding: 0;
    border: 2px solid transparent;
    border-radius: 8px;
    background: #f1f5f9;
    cursor: pointer;
    overflow: hidden;
}

.deck-thumb img {
    display: block;
    width: 100%;
    height: 54px;
    object-fit: cover;
}

.deck-thumb.active {
    border-color: #2563eb;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.deck-hint {
    text-align: center;
    color: #94a3b8;
    font-size: 0.78rem;
    margin-top: 0.85rem;
}

/* Maximized: same controls, full viewport, prev/next still work */
body.deck-maximized {
    overflow: hidden;
}

body.deck-maximized .deck-hero,
body.deck-maximized .deck-hint {
    display: none;
}

body.deck-maximized .deck-wrap {
    max-width: none;
    padding: 0;
}

body.deck-maximized .deck-stage {
    position: fixed;
    inset: 0;
    z-index: 2000;
    border-radius: 0;
    border: none;
    display: flex;
    flex-direction: column;
    background: #0b1220;
}

body.deck-maximized .deck-toolbar {
    background: #111827;
    border-bottom-color: #1f2937;
}

body.deck-maximized .deck-title,
body.deck-maximized .deck-counter {
    color: #f8fafc;
}

body.deck-maximized .deck-counter {
    background: rgba(37, 99, 235, 0.25);
    color: #93c5fd;
}

body.deck-maximized .deck-btn {
    background: #1f2937;
    border-color: #374151;
    color: #e5e7eb;
}

body.deck-maximized .deck-btn:hover:not(:disabled) {
    background: #1e3a8a;
    border-color: #3b82f6;
    color: #fff;
}

body.deck-maximized .deck-frame {
    flex: 1;
    min-height: 0;
}

body.deck-maximized .deck-slide {
    max-height: 100%;
    width: auto;
    max-width: 100%;
    height: 100%;
}

body.deck-maximized .deck-progress {
    background: #1f2937;
}

body.deck-maximized .deck-thumbs {
    background: #111827;
}

@media (max-width: 640px) {
    .deck-title { display: none; }
    .deck-slide { max-height: calc(100vh - 320px); }
    .deck-thumb { width: 78px; }
    .deck-thumb img { height: 44px; }
    .deck-hint { display: none; }
}