/* ============================================================
   津门商脉 · 样式系统
   衬线体 + Linear 风格 + 全屏分页 + 亮/暗模式
   ============================================================ */

/* ── Google Fonts 已在 HTML 中引入 ──
   Lora: 衬线体，用于标题
   DM Sans: 无衬线，用于正文/UI
   ─────────────────────────────── */

*, *::before, *::after {
    margin: 0; padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

button {
    touch-action: manipulation;
}

/* ============================================================
   CSS 变量 — 暗色模式（默认）
   ============================================================ */
:root {
    /* 颜色 */
    --bg:           #0d0c0a;
    --bg-elevated:  #161512;
    --bg-hover:     #1e1c18;
    --border:       rgba(255,255,255,0.08);
    --border-mid:   rgba(255,255,255,0.14);
    --text:         #f5f0e8;
    --text-2:       rgba(245,240,232,0.55);
    --text-3:       rgba(245,240,232,0.28);
    --gold:         #c8a96e;
    --gold-dim:     rgba(200,169,110,0.18);
    --gold-glow:    rgba(200,169,110,0.35);

    /* 排版 */
    --font-serif:   'Lora', 'STSong', 'SimSun', Georgia, serif;
    --font-sans:    'DM Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

    /* 过渡 */
    --ease:         cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);
    --t:            0.28s;

    /* 圆角 */
    --r:            12px;
    --r-sm:         7px;

    /* 安全区 */
    --safe-bottom:  env(safe-area-inset-bottom, 0px);
    --safe-top:     env(safe-area-inset-top, 0px);
}

/* ============================================================
   亮色模式
   ============================================================ */
[data-theme="light"] {
    --bg:           #f8f5ee;
    --bg-elevated:  #ffffff;
    --bg-hover:     #ede9df;
    --border:       rgba(0,0,0,0.08);
    --border-mid:   rgba(0,0,0,0.14);
    --text:         #1a1713;
    --text-2:       rgba(26,23,19,0.55);
    --text-3:       rgba(26,23,19,0.30);
    --gold:         #9a6f2e;
    --gold-dim:     rgba(154,111,46,0.12);
    --gold-glow:    rgba(154,111,46,0.25);
}

/* ============================================================
   基础
   ============================================================ */
html {
    -webkit-text-size-adjust: 100%;
    height: 100%;
    height: -webkit-fill-available;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    overflow: hidden;
    height: 100dvh;
    height: calc(var(--vh, 1vh) * 100);
    transition: background var(--t) var(--ease), color var(--t) var(--ease);
}

/* ============================================================
   主题切换按钮
   ============================================================ */
#themeToggle {
    position: fixed;
    top: calc(18px + var(--safe-top));
    right: 18px;
    z-index: 500;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border-mid);
    background: var(--bg-elevated);
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
                color var(--t) var(--ease), transform 0.15s;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
#themeToggle:hover  { background: var(--bg-hover); color: var(--text); transform: scale(1.08); }
#themeToggle:active { transform: scale(0.94); }

/* ============================================================
   进度条（顶部细线）
   ============================================================ */
#progressBar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 2px;
    z-index: 600;
    background: var(--border);
}
#progressFill {
    height: 100%;
    background: var(--gold);
    width: 0%;
    transition: width 0.4s var(--ease-out);
}

/* ============================================================
   全屏幻灯片容器
   ============================================================ */
#slideContainer {
    width: 100%;
    height: 100dvh;
    height: calc(var(--vh, 1vh) * 100);
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
#slideContainer::-webkit-scrollbar { display: none; }

/* ============================================================
   单张幻灯片
   ============================================================ */
.slide {
    width: 100%;
    height: 100dvh;
    height: calc(var(--vh, 1vh) * 100);
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 0 28px;
    position: relative;
    overflow: hidden;
    transition: background 0.5s var(--ease);
}

/* ── 幻灯片内容区（限制宽度居中）── */
.slide-inner {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

/* ── 噪点纹理叠层 ── */
.slide::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 200px;
    pointer-events: none;
    z-index: 1;
}

/* ── 幻灯片背景主题 ── */
.slide[data-period="0"] { background: var(--bg); }
.slide[data-period="1"] { background: var(--bg); }
.slide[data-period="2"] { background: var(--bg); }
.slide[data-period="3"] { background: var(--bg); }

/* 颜色斑块：每个时期用径向渐变 */
.slide[data-period="0"]::before { content:''; position:absolute; inset:0; background: radial-gradient(ellipse 80% 60% at 20% 30%, var(--period-0-glow, rgba(200,169,110,0.10)) 0%, transparent 65%); pointer-events:none; z-index:1; transition: background 0.5s; }
.slide[data-period="1"]::before { content:''; position:absolute; inset:0; background: radial-gradient(ellipse 80% 60% at 80% 20%, var(--period-1-glow, rgba(74,144,217,0.10)) 0%, transparent 65%); pointer-events:none; z-index:1; transition: background 0.5s; }
.slide[data-period="2"]::before { content:''; position:absolute; inset:0; background: radial-gradient(ellipse 80% 60% at 15% 70%, var(--period-2-glow, rgba(190,100,80,0.10)) 0%, transparent 65%); pointer-events:none; z-index:1; transition: background 0.5s; }
.slide[data-period="3"]::before { content:''; position:absolute; inset:0; background: radial-gradient(ellipse 80% 60% at 85% 60%, var(--period-3-glow, rgba(80,180,120,0.10)) 0%, transparent 65%); pointer-events:none; z-index:1; transition: background 0.5s; }

/* ── 封面幻灯片 ── */
.slide.is-cover {
    align-items: center;
    text-align: center;
}
.slide.is-cover::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 55% at 50% 10%, var(--gold-dim) 0%, transparent 65%);
    pointer-events: none;
    z-index: 1;
}

/* ── 封面大字水印 ── */
.slide.is-cover .cover-watermark {
    position: absolute;
    font-family: var(--font-serif);
    font-size: clamp(200px, 55vw, 420px);
    font-weight: 700;
    color: var(--gold);
    opacity: 0.04;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    user-select: none;
    z-index: 0;
    white-space: nowrap;
    line-height: 1;
}

/* ── 封面 SVG 装饰圆弧 ── */
.cover-arc {
    position: absolute;
    pointer-events: none;
    z-index: 0;
    opacity: 0.12;
    transition: opacity var(--t);
}

/* ============================================================
   封面内容
   ============================================================ */
.cover-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 14px;
    border: 1px solid var(--gold);
    border-radius: 100px;
    font-family: var(--font-sans);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.18em;
    color: var(--gold);
    text-transform: uppercase;
    margin-bottom: 20px;
    opacity: 0;
    animation: revealUp 0.8s 0.1s var(--ease-out) forwards;
}
.cover-eyebrow-dot {
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--gold);
    flex-shrink: 0;
}

.cover-title {
    font-family: var(--font-serif);
    font-size: clamp(56px, 18vw, 104px);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 18px;
    opacity: 0;
    animation: revealUp 0.9s 0.2s var(--ease-out) forwards;
}
.cover-title em {
    font-style: italic;
    color: var(--gold);
}

.cover-subtitle {
    font-family: var(--font-sans);
    font-size: clamp(14px, 3.5vw, 17px);
    font-weight: 300;
    color: var(--text-2);
    letter-spacing: 0.06em;
    margin-bottom: 10px;
    opacity: 0;
    animation: revealUp 0.9s 0.32s var(--ease-out) forwards;
}

.cover-project {
    font-size: 11px;
    color: var(--text-3);
    letter-spacing: 0.04em;
    line-height: 1.6;
    max-width: 300px;
    margin: 0 auto 36px;
    opacity: 0;
    animation: revealUp 0.9s 0.42s var(--ease-out) forwards;
}

.cover-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 13px 28px;
    background: var(--gold);
    color: #0d0c0a;
    border: none;
    border-radius: 100px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 0 0 0 var(--gold-glow);
    opacity: 0;
    animation: revealUp 0.9s 0.52s var(--ease-out) forwards;
}
.cover-cta:hover  { transform: scale(1.04); box-shadow: 0 0 32px var(--gold-glow); }
.cover-cta:active { transform: scale(0.96); }
.cover-cta svg    { transition: transform 0.2s; }
.cover-cta:hover svg { transform: translateY(3px); }

/* ── 封面底部元数据 ── */
.cover-meta {
    position: absolute;
    bottom: calc(28px + var(--safe-bottom));
    left: 0; right: 0;
    display: flex;
    justify-content: center;
    gap: 24px;
    z-index: 2;
    opacity: 0;
    animation: fadeIn 1s 0.8s ease forwards;
}
.cover-meta-item {
    text-align: center;
}
.cover-meta-num {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
    line-height: 1;
}
.cover-meta-label {
    font-size: 10px;
    color: var(--text-3);
    letter-spacing: 0.1em;
    margin-top: 3px;
    text-transform: uppercase;
}
.cover-meta-sep {
    width: 1px;
    background: var(--border-mid);
    height: 36px;
    align-self: center;
}

/* ============================================================
   时期 — 章节首页 slide
   ============================================================ */
.period-label {
    font-family: var(--font-sans);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent, var(--gold));
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.period-label::before {
    content: '';
    display: block;
    width: 24px;
    height: 1px;
    background: var(--accent, var(--gold));
    flex-shrink: 0;
}

.period-num {
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-serif);
    font-size: clamp(100px, 28vw, 200px);
    font-weight: 700;
    color: var(--text);
    opacity: 0.035;
    line-height: 1;
    user-select: none;
    pointer-events: none;
    z-index: 0;
    letter-spacing: -0.05em;
}

.period-title {
    font-family: var(--font-serif);
    font-size: clamp(42px, 12vw, 76px);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 10px;
}

.period-timespan {
    font-family: var(--font-sans);
    font-size: clamp(13px, 3vw, 15px);
    font-weight: 400;
    color: var(--accent, var(--gold));
    letter-spacing: 0.08em;
    margin-bottom: 20px;
}

.period-desc {
    font-family: var(--font-sans);
    font-size: clamp(13px, 3.2vw, 15px);
    font-weight: 300;
    color: var(--text-2);
    line-height: 1.8;
    max-width: 380px;
    margin-bottom: 32px;
}

/* 章节首页底部分隔线 + 品牌数 */
.period-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.period-footer-count {
    font-family: var(--font-serif);
    font-size: 13px;
    color: var(--text-3);
}
.period-footer-count strong {
    color: var(--accent, var(--gold));
    font-family: var(--font-serif);
}
.period-continue {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--text-3);
    text-transform: uppercase;
}

/* ============================================================
   品牌内容 slide
   ============================================================ */
.brand-eyebrow {
    font-family: var(--font-sans);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent, var(--gold));
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.brand-eyebrow::before {
    content: '';
    display: block;
    width: 16px;
    height: 1px;
    background: var(--accent, var(--gold));
}

.brand-title {
    font-family: var(--font-serif);
    font-size: clamp(28px, 8vw, 48px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 6px;
}

.brand-slogan {
    font-family: var(--font-serif);
    font-size: clamp(13px, 3vw, 15px);
    font-style: italic;
    color: var(--text-2);
    margin-bottom: 20px;
    line-height: 1.5;
}

.brand-medium-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border: 1px solid var(--border-mid);
    border-radius: 100px;
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--text-2);
    margin-bottom: 22px;
    font-family: var(--font-sans);
    text-transform: uppercase;
}

/* ── 图片网格 ── */
.images-grid {
    display: grid;
    gap: 8px;
    grid-template-columns: repeat(2, 1fr);
    margin-bottom: 4px;
}
.images-grid[data-count="1"] {
    grid-template-columns: 1fr;
}
.images-grid[data-count="3"] .image-card:last-child,
.images-grid[data-count="5"] .image-card:first-child {
    grid-column: span 2;
}
.images-grid[data-count="4"],
.images-grid[data-count="6"] {
    grid-template-columns: repeat(3, 1fr);
}

.image-card {
    border-radius: var(--r-sm);
    overflow: hidden;
    cursor: pointer;
    position: relative;
    background: var(--bg-elevated);
    aspect-ratio: 1;
    border: 1px solid var(--border);
    transition: border-color var(--t), transform 0.18s;
}
.images-grid[data-count="1"] .image-card {
    aspect-ratio: 4 / 3;
    border-radius: var(--r);
}
.image-card:hover  { border-color: var(--border-mid); transform: scale(1.01); }
.image-card:active { transform: scale(0.97); }

.image-wrap {
    width: 100%; height: 100%;
    position: relative; overflow: hidden;
}
.image-wrap img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.4s var(--ease);
    display: block;
}
.image-card:hover .image-wrap img { transform: scale(1.06); }

.image-overlay {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0);
    display: flex; align-items: center; justify-content: center;
    transition: background var(--t);
}
.image-card:hover .image-overlay { background: rgba(0,0,0,0.28); }

.zoom-icon {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.9);
    display: flex; align-items: center; justify-content: center;
    opacity: 0;
    transform: scale(0.6);
    transition: opacity var(--t), transform var(--t);
    color: #000;
}
.image-card:hover .zoom-icon { opacity: 1; transform: scale(1); }

.image-caption {
    font-size: 10px;
    color: var(--text-3);
    padding: 5px 3px 0;
    line-height: 1.4;
    text-align: center;
    font-family: var(--font-sans);
}

/* ── 幻灯片内 SVG 装饰线 ── */
.slide-deco {
    position: absolute;
    pointer-events: none;
    z-index: 0;
    opacity: 0.07;
    stroke: var(--text);
    fill: none;
    transition: opacity var(--t);
}

/* ============================================================
   尾页 slide
   ============================================================ */
.slide.is-outro {
    align-items: center;
    text-align: center;
}
.outro-title {
    font-family: var(--font-serif);
    font-size: clamp(32px, 9vw, 56px);
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
    line-height: 1.1;
}
.outro-sub {
    font-size: 13px;
    color: var(--text-3);
    line-height: 1.7;
    max-width: 280px;
    margin: 0 auto 32px;
}
.outro-stats {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-bottom: 40px;
}
.outro-stat-num {
    font-family: var(--font-serif);
    font-size: 36px;
    font-weight: 700;
    color: var(--gold);
    line-height: 1;
}
.outro-stat-label {
    font-size: 10px;
    color: var(--text-3);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-top: 4px;
}
.outro-divider {
    width: 1px;
    background: var(--border-mid);
    height: 50px;
    align-self: center;
}
.outro-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 24px;
    border: 1px solid var(--border-mid);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-2);
    cursor: pointer;
    background: none;
    font-family: var(--font-sans);
    transition: background var(--t), border-color var(--t), color var(--t);
}
.outro-back:hover {
    background: var(--bg-elevated);
    border-color: var(--gold);
    color: var(--gold);
}

/* ============================================================
   导航箭头（右下角叠放）
   ============================================================ */
.nav-arrow {
    position: fixed;
    right: 18px;
    z-index: 300;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-mid);
    background: var(--bg-elevated);
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--t), color var(--t), border-color var(--t),
                opacity var(--t), transform 0.2s;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    touch-action: manipulation;
}
.nav-arrow:hover  { background: var(--bg-hover); color: var(--text); border-color: var(--gold); }
.nav-arrow:active { transform: scale(0.92); }
.nav-arrow.hidden { opacity: 0; pointer-events: none; }

/* 加载完成后 navNext 的高亮提示动画 */
.nav-arrow.nav-hint {
    animation: navHintPulse 0.7s cubic-bezier(0.600, 0.000, 0.000, 1.000) 3;
    border-color: var(--gold);
    color: var(--gold);
}

@keyframes navHintPulse {
    0%   { transform: scale(1);    box-shadow: 0 0 0 0 var(--gold-glow); }
    40%  { transform: scale(1.18); box-shadow: 0 0 0 8px transparent; }
    100% { transform: scale(1);    box-shadow: 0 0 0 0 transparent; }
}

#navPrev {
    bottom: calc(70px + var(--safe-bottom));
}
#navNext {
    bottom: calc(18px + var(--safe-bottom));
}

/* ============================================================
   页面指示器（右侧竖排点）
   ============================================================ */
#slideIndicator {
    position: fixed;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
}

.ind-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-3);
    border: none;
    padding: 0;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    display: block;
}
.ind-dot.active {
    height: 20px;
    border-radius: 2px;
    background: var(--gold);
}
.ind-dot.period-start {
    background: var(--text-2);
    width: 5px;
    height: 5px;
    margin-top: 4px;
}
.ind-dot.period-start.active {
    background: var(--gold);
    height: 20px;
    border-radius: 2px;
}

/* ============================================================
   模态大图
   ============================================================ */
.modal {
    display: none;
    position: fixed;
    z-index: 900;
    inset: 0;
}
.modal.show { display: block; }

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.92);
    animation: fadeIn 0.2s ease;
    cursor: pointer;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: min(92vw, 680px);
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    animation: modalReveal 0.3s var(--ease-out);
    z-index: 1;
}
.modal-content img {
    max-width: 100%;
    max-height: 72vh;
    object-fit: contain;
    border-radius: var(--r);
    display: block;
    box-shadow: 0 32px 80px rgba(0,0,0,0.6);
}
.modal-content p {
    color: rgba(255,255,255,0.65);
    font-size: 13px;
    text-align: center;
    line-height: 1.5;
    font-family: var(--font-sans);
    max-width: 480px;
}

.modal-close {
    position: fixed;
    top: calc(16px + var(--safe-top));
    left: 18px;
    width: 38px; height: 38px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.8);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    z-index: 1001;
    transition: background 0.2s;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.modal-close:hover { background: rgba(255,255,255,0.16); }

/* ============================================================
   动画
   ============================================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes revealUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes modalReveal {
    from { opacity: 0; transform: translate(-50%, calc(-50% + 16px)); }
    to   { opacity: 1; transform: translate(-50%, -50%); }
}

/* ============================================================
   页面切换扫光效果
   ============================================================ */

/* 内容层切换时的模糊 */
#slideContainer.transitioning {
    filter: blur(2px);
    transition: filter 0.45s cubic-bezier(0.165, 0.84, 0.44, 1);
}
#slideContainer {
    transition: filter 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* 扫光长方形 */
.sweep-bar {
    position: fixed;
    left: 0;
    width: 100%;
    height: 280px;
    background: #ffffff;
    mix-blend-mode: overlay;
    filter: blur(100px);
    pointer-events: none;
    z-index: 800;
    top: calc(100% + 140px);
    will-change: top;
}

.sweep-bar.sweeping {
    animation: sweepUp 2s cubic-bezier(0.090, 0.910, 0.125, 1.000) forwards;
}

@keyframes sweepUp {
    0% {
        top: calc(100% + 300px);
        opacity: 1;
    }
    10% {
        top: calc(100% + 300px);
        opacity: 1;
    }
    100% {
        top: -480px;
        opacity: 0;
    }
}
.slide-inner > * {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.55s var(--ease-out), transform 0.55s var(--ease-out);
}
.slide.is-active .slide-inner > * {
    opacity: 1;
    transform: translateY(0);
}
/* 错开每个子元素动画 */
.slide.is-active .slide-inner > *:nth-child(1) { transition-delay: 0.05s; }
.slide.is-active .slide-inner > *:nth-child(2) { transition-delay: 0.12s; }
.slide.is-active .slide-inner > *:nth-child(3) { transition-delay: 0.19s; }
.slide.is-active .slide-inner > *:nth-child(4) { transition-delay: 0.26s; }
.slide.is-active .slide-inner > *:nth-child(5) { transition-delay: 0.33s; }
.slide.is-active .slide-inner > *:nth-child(6) { transition-delay: 0.40s; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 480px) {
    .slide { padding: 0 20px; }
    #slideIndicator { right: 10px; }
    .images-grid[data-count="4"],
    .images-grid[data-count="6"] { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
    .slide { padding: 0 48px; }
    .images-grid { gap: 10px; }
}

/* ── 亮色模式下的调整 ── */
[data-theme="light"] .slide.is-cover::before {
    background: radial-gradient(ellipse 70% 55% at 50% 10%, rgba(154,111,46,0.08) 0%, transparent 65%);
}
[data-theme="light"] .modal-backdrop {
    background: rgba(248,245,238,0.92);
}
[data-theme="light"] .modal-content p {
    color: rgba(26,23,19,0.65);
}
[data-theme="light"] .modal-close {
    border-color: rgba(0,0,0,0.12);
    background: rgba(0,0,0,0.05);
    color: rgba(26,23,19,0.7);
}
[data-theme="light"] .modal-close:hover {
    background: rgba(0,0,0,0.10);
}

/* ============================================================
   修正 slide 切换动画曲线
   参考示例：cubic-bezier(0.600, 0.000, 0.000, 1.000)
   先慢蓄力、极速冲出、硬朗停止——有质感的机械感
   ============================================================ */
:root {
    --ease-snap: cubic-bezier(0.600, 0.000, 0.000, 1.000);
}

/* 覆盖之前的 slide-inner 子元素进入动画曲线 */
.slide.is-active .slide-inner > * {
    transition-timing-function: cubic-bezier(0.600, 0.000, 0.000, 1.000);
}

/* ============================================================
   封面打字机
   ============================================================ */

/* 斜体动态词容器 */
.cover-title-typewriter {
    display: inline;
}

/* 打字机光标（在 em 内的 span） */
.cover-type-cursor {
    display: inline-block;
    width: clamp(2px, 0.35vw, 4px);
    height: 0.82em;
    background: var(--gold);
    margin-left: 3px;
    vertical-align: middle;
    border-radius: 1px;
    position: relative;
    top: -0.06em;
    animation: coverCursorBlink 1s infinite;
}

@keyframes coverCursorBlink {
    0%, 45%  { opacity: 1; }
    60%, 100% { opacity: 0; }
}

/* CTA 默认隐藏，加载完成后移除此 class */
.cover-cta--hidden {
    opacity: 0 !important;
    pointer-events: none !important;
    transform: translateY(10px) !important;
    transition: opacity 0.6s cubic-bezier(0.600, 0.000, 0.000, 1.000),
                transform 0.6s cubic-bezier(0.600, 0.000, 0.000, 1.000) !important;
}

.cover-cta {
    transition: opacity 0.6s cubic-bezier(0.600, 0.000, 0.000, 1.000),
                transform 0.6s cubic-bezier(0.600, 0.000, 0.000, 1.000),
                box-shadow 0.2s ease !important;
}