/* ═══════════════════════════════════════════════
   AIProp Research Center – Stylesheet v1.0
   Dark theme, 3D book hover, responsive grid
═══════════════════════════════════════════════ */

/* ── Reset & Base ─────────────────────────── */
.aiprop-rc-wrap *,
.aiprop-rc-wrap *::before,
.aiprop-rc-wrap *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.aiprop-rc-wrap {
    --rc-bg:       #0a0a0a;
    --rc-surface:  #111111;
    --rc-border:   rgba(255,255,255,0.08);
    --rc-text:     #e8e8e8;
    --rc-muted:    #888;
    --rc-accent:   #00E5A0;
    --rc-font:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    font-family: var(--rc-font);
    background:  var(--rc-bg);
    color:       var(--rc-text);
    padding:     60px 0;
    width:       100%;
}

/* ── Hero ─────────────────────────────────── */
.aiprop-rc-hero {
    display:         grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: 1fr auto;
    gap:             40px;
    align-items:     center;
    border:          1px solid var(--rc-border);
    border-radius:   16px;
    padding:         56px 60px;
    margin-bottom:   4px;
    background:      var(--rc-surface);
    position:        relative;
    overflow:        hidden;
    min-height:      420px;
}

.aiprop-rc-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 80% at 80% 50%, rgba(0,229,160,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.aiprop-rc-hero__quote {
    grid-column: 1;
    grid-row: 1;
    max-width: 480px;
}

.aiprop-rc-hero__quote-mark {
    font-size: 80px;
    line-height: 0;
    vertical-align: -32px;
    color: var(--rc-accent);
    font-family: Georgia, serif;
    margin-right: 4px;
    opacity: 0.7;
}

.aiprop-rc-hero__quote {
    font-size: clamp(18px, 2.2vw, 26px);
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: -0.02em;
    color: var(--rc-text);
}

.aiprop-rc-hero__quote-source {
    margin-top: 16px;
    font-size: 13px;
    color: var(--rc-muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* book in hero */
.aiprop-rc-hero > .aiprop-rc-book-link {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
}

.aiprop-rc-hero__footer {
    grid-column: 1;
    grid-row: 2;
    display:     flex;
    align-items: center;
    gap:         16px;
    padding-top: 24px;
    border-top:  1px solid var(--rc-border);
    flex-wrap:   wrap;
}

.aiprop-rc-hero__cats {
    font-size:    13px;
    color:        var(--rc-muted);
    letter-spacing: 0.03em;
}

.aiprop-rc-hero__cta {
    margin-left:  auto;
    font-size:    14px;
    font-weight:  600;
    color:        var(--rc-text);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition:   color 0.2s;
}
.aiprop-rc-hero__cta:hover { color: var(--rc-accent); }

/* ── Grid ─────────────────────────────────── */
.aiprop-rc-grid {
    display:               grid;
    grid-template-columns: repeat(2, 1fr);
    gap:                   4px;
    margin-top:            4px;
}

.aiprop-rc-card {
    background:    var(--rc-surface);
    border:        1px solid var(--rc-border);
    border-radius: 16px;
    padding:       40px 44px;
    display:       flex;
    flex-direction: column;
    gap:           24px;
    position:      relative;
    overflow:      hidden;
    transition:    border-color 0.25s;
}
.aiprop-rc-card:hover { border-color: rgba(0,229,160,0.25); }

.aiprop-rc-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 70% at 70% 40%, rgba(0,229,160,0.04) 0%, transparent 70%);
    pointer-events: none;
}

.aiprop-rc-card__cats {
    font-size:      12px;
    color:          var(--rc-muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.aiprop-rc-card__footer {
    display:     flex;
    align-items: center;
    gap:         12px;
    padding-top: 20px;
    border-top:  1px solid var(--rc-border);
    flex-wrap:   wrap;
    margin-top:  auto;
}

.aiprop-rc-card__cta {
    margin-left:     auto;
    font-size:       13px;
    font-weight:     600;
    color:           var(--rc-text);
    text-decoration: none;
    letter-spacing:  0.02em;
    transition:      color 0.2s;
}
.aiprop-rc-card__cta:hover { color: var(--rc-accent); }

/* ── Tag ──────────────────────────────────── */
.aiprop-rc-tag {
    display:     inline-flex;
    align-items: center;
    gap:         5px;
    font-size:   12px;
    color:       var(--rc-muted);
    border:      1px solid var(--rc-border);
    border-radius: 6px;
    padding:     4px 10px;
    letter-spacing: 0.02em;
}

/* ═══════════════════════════════════════════
   3-D BOOK – shared
═══════════════════════════════════════════ */
.aiprop-rc-book-link {
    display:         block;
    text-decoration: none;
    perspective:     900px;
}

.aiprop-rc-book {
    position:        relative;
    transform-style: preserve-3d;
    transform:       rotateY(-10deg) rotateX(2deg);
    transition:      transform 0.45s cubic-bezier(0.22,1,0.36,1),
                     filter    0.45s ease;
    filter:          drop-shadow(0 20px 40px rgba(0,0,0,0.55));
    cursor:          pointer;
}

/* Hero size */
.aiprop-rc-book--hero {
    width:  210px;
    height: 280px;
}

/* Grid size */
.aiprop-rc-book--grid {
    width:  180px;
    height: 240px;
    margin: 0 auto;
}

/* Cover */
.aiprop-rc-book__cover {
    position:         absolute;
    inset:            0;
    background-color: var(--book-color, #00E5A0);
    border-radius:    4px 10px 10px 4px;
    display:          flex;
    flex-direction:   column;
    justify-content:  space-between;
    padding:          22px 18px 20px;
    z-index:          2;
    backface-visibility: hidden;
    background-image: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, transparent 50%);
}

/* Spine */
.aiprop-rc-book__spine {
    position:         absolute;
    top:              0;
    left:             0;
    width:            22px;
    height:           100%;
    background-color: color-mix(in srgb, var(--book-color, #00E5A0) 70%, #000 30%);
    border-radius:    4px 0 0 4px;
    transform:        translateX(-100%) rotateY(-90deg) translateZ(0);
    transform-origin: right center;
    z-index:          1;
}

/* Pages stack */
.aiprop-rc-book__page {
    position:      absolute;
    top:           3px;
    right:         -5px;
    bottom:        3px;
    background:    #f0ece4;
    border-radius: 0 6px 6px 0;
    z-index:       0;
    transition:    transform 0.45s cubic-bezier(0.22,1,0.36,1);
}
.aiprop-rc-book__page--1 { width: 6px; transform: translateX(0); }
.aiprop-rc-book__page--2 { width: 5px; transform: translateX(2px); background: #e8e4dc; }
.aiprop-rc-book__page--3 { width: 4px; transform: translateX(4px); background: #ddd9d1; }

/* Text on cover */
.aiprop-rc-book__date {
    font-size:      11px;
    color:          rgba(0,0,0,0.65);
    letter-spacing: 0.04em;
    font-weight:    500;
}

.aiprop-rc-book__title {
    font-size:   clamp(14px, 1.5vw, 18px);
    font-weight: 700;
    color:       rgba(0,0,0,0.88);
    line-height: 1.35;
    letter-spacing: -0.02em;
    flex: 1;
    padding: 10px 0;
}

.aiprop-rc-book__authors {
    font-size:  11px;
    color:      rgba(0,0,0,0.6);
    font-style: italic;
}

/* ── Hover: open / fan effect ─────────────── */
.aiprop-rc-book:hover,
.aiprop-rc-book-link:hover .aiprop-rc-book {
    transform: rotateY(-28deg) rotateX(2deg) translateX(-8px);
    filter:    drop-shadow(0 30px 60px rgba(0,0,0,0.7));
}

.aiprop-rc-book:hover .aiprop-rc-book__page--1,
.aiprop-rc-book-link:hover .aiprop-rc-book .aiprop-rc-book__page--1 {
    transform: translateX(8px) rotateY(15deg);
}
.aiprop-rc-book:hover .aiprop-rc-book__page--2,
.aiprop-rc-book-link:hover .aiprop-rc-book .aiprop-rc-book__page--2 {
    transform: translateX(14px) rotateY(22deg);
}
.aiprop-rc-book:hover .aiprop-rc-book__page--3,
.aiprop-rc-book-link:hover .aiprop-rc-book .aiprop-rc-book__page--3 {
    transform: translateX(20px) rotateY(30deg);
}

/* ── Responsive ───────────────────────────── */
@media (max-width: 900px) {
    .aiprop-rc-hero {
        grid-template-columns: 1fr;
        grid-template-rows:    auto auto auto;
        padding: 36px 28px;
    }
    .aiprop-rc-hero > .aiprop-rc-book-link {
        grid-column: 1;
        grid-row:    2;
        justify-self: center;
    }
    .aiprop-rc-hero__footer {
        grid-column: 1;
        grid-row:    3;
    }
}

@media (max-width: 640px) {
    .aiprop-rc-grid { grid-template-columns: 1fr; }
    .aiprop-rc-card { padding: 28px 20px; }
    .aiprop-rc-hero { padding: 28px 20px; }
}