/* ============================================================
   OpenMentor Landing · Anthropic / Claude 风格
   ============================================================ */

:root {
    /* 米白系（背景） */
    --om-cream:        #F0EEE6;
    --om-cream-soft:   #F7F4EC;
    --om-cream-warm:   #E8E4D8;
    --om-paper:        #FFFFFF;

    /* 文字 */
    --om-ink:          #141413;
    --om-ink-soft:     #2D2A24;
    --om-muted:        #6B6760;
    --om-subtle:       #94918B;

    /* 边界 */
    --om-border:       #E5E0D8;
    --om-border-strong:#C9C3B8;
    --om-divider:      #EDE8DD;

    /* 强调色 - Claude 标志赭橙 */
    --om-clay:         #D97757;
    --om-clay-hover:   #C56548;
    --om-clay-soft:    #F5E6DD;
    --om-clay-deep:    #A04D38;

    /* 语义色 */
    --om-success:      #5B7553;
    --om-success-soft: #E5EBDF;

    /* 字体 */
    --om-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    --om-font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'Source Serif 4', 'Source Serif Pro', 'Songti SC', 'STSong', serif;
    --om-font-mono: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;

    /* 几何 */
    --om-radius-sm: 6px;
    --om-radius:    10px;
    --om-radius-lg: 14px;
    --om-radius-xl: 20px;
    --om-radius-pill: 999px;

    /* 阴影 */
    --om-shadow-sm: 0 1px 3px rgba(20, 17, 12, 0.05);
    --om-shadow-md: 0 4px 16px rgba(20, 17, 12, 0.06);
    --om-shadow-lg: 0 12px 40px rgba(20, 17, 12, 0.10);

    /* 容器 */
    --om-container: 1140px;
}

/* ----- 暗黑模式 ----- */
html[data-theme="dark"] {
    --om-cream:        #1F1E1B;
    --om-cream-soft:   #26241F;
    --om-cream-warm:   #2E2B25;
    --om-paper:        #2A2722;

    --om-ink:          #EDE8DD;
    --om-ink-soft:     #D4CDBE;
    --om-muted:        #94918B;
    --om-subtle:       #6B6760;

    --om-border:       #3A362F;
    --om-border-strong:#4A453C;
    --om-divider:      #322F29;

    --om-clay:         #E89878;
    --om-clay-hover:   #F0AC92;
    --om-clay-soft:    #3F2D24;
    --om-clay-deep:    #C56548;

    --om-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --om-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --om-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* 主题切换瞬间禁用过渡 */
html.theme-changing,
html.theme-changing *,
html.theme-changing *::before,
html.theme-changing *::after {
    transition: none !important;
}

/* ----- Reset & base ----- */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    font-family: var(--om-font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

html, body {
    background-color: var(--om-cream);
    color: var(--om-ink);
    margin: 0;
    padding: 0;
}

body {
    font-size: 15px;
    line-height: 1.65;
    letter-spacing: -0.005em;
    overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--om-clay-soft); color: var(--om-ink); }

/* 字体加载平滑 */
.om-display, h1, h2, h3, h4, h5 {
    font-family: var(--om-font-serif);
    font-weight: 500;
    letter-spacing: -0.018em;
    line-height: 1.22;
    color: var(--om-ink);
    margin: 0;
    font-feature-settings: 'palt';
}

h2 { font-size: clamp(1.75rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.45rem); font-weight: 500; }

p { margin: 0; color: var(--om-ink-soft); font-family: var(--om-font-serif); font-weight: 400; }
.text-muted { color: var(--om-muted) !important; }

/* ----- 容器 ----- */
.container {
    width: 100%;
    max-width: var(--om-container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   导航栏
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--om-cream) 82%, transparent);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.25s ease, background-color 0.25s ease;
}
.navbar.scrolled {
    border-bottom-color: var(--om-border);
}
.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
}
.brand,
.brand * {
    font-family: var(--om-font-serif);
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--om-ink);
    letter-spacing: 0.02em;
}
.brand img { width: 28px; height: 28px; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-links a {
    padding: 8px 14px;
    border-radius: var(--om-radius-sm);
    color: var(--om-muted);
    font-size: 0.92rem;
    font-weight: 500;
    transition: color 0.15s ease, background-color 0.15s ease;
}
.nav-links a:hover {
    color: var(--om-ink);
    background: var(--om-cream-warm);
}
.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: var(--om-radius-pill);
    border: 1px solid var(--om-border);
    background: transparent;
    color: var(--om-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.theme-toggle:hover {
    background: var(--om-cream-warm);
    color: var(--om-ink);
    border-color: var(--om-border-strong);
}
.theme-toggle svg { width: 16px; height: 16px; }

/* 移动端汉堡 */
.menu-toggle {
    display: none;
    width: 36px; height: 36px;
    border: 1px solid var(--om-border);
    background: transparent;
    border-radius: var(--om-radius-sm);
    color: var(--om-ink);
    align-items: center;
    justify-content: center;
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: var(--om-radius-pill);
    border: 1px solid transparent;
    padding: 11px 22px;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.2;
    transition: all 0.18s ease;
    white-space: nowrap;
    text-decoration: none;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary {
    background: var(--om-ink);
    color: var(--om-cream-soft);
}
.btn-primary:hover {
    background: var(--om-ink-soft);
    box-shadow: 0 4px 14px rgba(20, 17, 12, 0.18);
    transform: translateY(-1px);
}
.btn-secondary {
    background: var(--om-paper);
    color: var(--om-ink);
    border-color: var(--om-border-strong);
}
.btn-secondary:hover {
    background: var(--om-cream-warm);
    border-color: var(--om-ink);
    transform: translateY(-1px);
}
.btn-clay {
    background: var(--om-clay);
    color: white;
}
.btn-clay:hover {
    background: var(--om-clay-hover);
    box-shadow: 0 4px 14px rgba(217, 119, 87, 0.32);
    transform: translateY(-1px);
}

/* ============================================================
   Section 公共
   ============================================================ */
section {
    padding: clamp(80px, 11vw, 140px) 0;
    position: relative;
}
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--om-font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--om-clay-deep);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 18px;
    padding: 4px 12px;
    background: var(--om-clay-soft);
    border-radius: var(--om-radius-pill);
}
.section-title {
    font-size: clamp(1.9rem, 3.2vw, 2.6rem);
    font-weight: 500;
    margin-bottom: 16px;
    line-height: 1.25;
}
.section-title u {
    text-decoration-color: var(--om-clay);
    text-decoration-thickness: 2px;
    text-underline-offset: 8px;
}
.section-sub {
    font-family: var(--om-font-serif);
    font-weight: 400;
    color: var(--om-muted);
    font-size: 1.05rem;
    max-width: 56ch;
    line-height: 1.75;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
    padding-top: clamp(140px, 16vw, 200px);
    padding-bottom: clamp(80px, 10vw, 120px);
    position: relative;
    overflow: hidden;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero h1.om-display {
    font-size: clamp(2.5rem, 5.4vw, 4.3rem);
    font-weight: 500;
    line-height: 1.15;
    margin-bottom: 28px;
}
.hero h1 u {
    text-decoration-color: var(--om-clay);
    text-decoration-thickness: 3px;
    text-underline-offset: 10px;
}
.hero-sub {
    font-family: var(--om-font-serif);
    font-weight: 400;
    color: var(--om-muted);
    font-size: 1.08rem;
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 52ch;
}
.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.hero-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--om-radius-pill);
    background: var(--om-paper);
    border: 1px solid var(--om-border);
    color: var(--om-ink-soft);
    font-size: 0.82rem;
    font-weight: 500;
}
.chip::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--om-clay);
}

/* Hero 右侧 logo 区域 */
.hero-visual {
    position: relative;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-logo-stage {
    position: relative;
    width: 88%;
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--om-clay-soft), var(--om-paper) 70%);
    border: 1px solid var(--om-border);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--om-shadow-md);
}
.hero-logo-stage img {
    width: 78%;
    height: auto;
    filter: drop-shadow(0 8px 22px rgba(217, 119, 87, 0.28));
    animation: heroLogoFloat 6s ease-in-out infinite;
}
.hero-orbit {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 1px dashed var(--om-border-strong);
    opacity: 0.55;
    animation: heroOrbit 40s linear infinite;
}
.hero-orbit::before, .hero-orbit::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: var(--om-clay);
}
.hero-orbit::before {
    width: 14px; height: 14px;
    top: -7px; left: calc(50% - 7px);
    box-shadow: 0 0 0 4px var(--om-cream-soft);
}
.hero-orbit::after {
    width: 8px; height: 8px;
    bottom: 6%; left: 12%;
    background: var(--om-ink);
    box-shadow: 0 0 0 4px var(--om-cream-soft);
}
.hero-blob {
    position: absolute;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.6;
    pointer-events: none;
    z-index: -1;
}
.hero-blob.b1 {
    background: var(--om-clay);
    top: -20px; right: -40px;
    animation: blob 12s ease-in-out infinite;
}
.hero-blob.b2 {
    background: var(--om-success);
    bottom: -40px; left: -60px;
    animation: blob 16s ease-in-out infinite reverse;
    opacity: 0.4;
}

@keyframes heroLogoFloat {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-12px) rotate(2deg); }
}
@keyframes heroOrbit {
    to { transform: rotate(360deg); }
}
@keyframes blob {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.15); }
}

/* ============================================================
   模块通用：双栏
   ============================================================ */
.module-grid {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 64px;
    align-items: center;
}
.module-grid.reverse {
    grid-template-columns: 1.15fr 1fr;
}
.module-grid.reverse > .module-visual {
    order: -1;
}
.pain-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-top: 32px;
}
.pain-item {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: 16px;
    align-items: flex-start;
    padding: 16px 18px;
    background: var(--om-paper);
    border: 1px solid var(--om-border);
    border-radius: var(--om-radius-lg);
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.pain-item:hover {
    border-color: var(--om-clay);
    transform: translateY(-2px);
    box-shadow: var(--om-shadow-sm);
}
.pain-icon {
    width: 40px; height: 40px;
    border-radius: var(--om-radius);
    background: var(--om-clay-soft);
    color: var(--om-clay-deep);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.pain-icon svg { width: 20px; height: 20px; }
.pain-title {
    font-family: var(--om-font-serif);
    font-weight: 500;
    font-size: 1.08rem;
    color: var(--om-ink);
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}
.pain-desc {
    font-family: var(--om-font-serif);
    font-weight: 400;
    font-size: 0.95rem;
    color: var(--om-muted);
    line-height: 1.7;
}

/* 模块 visual 容器（统一卡片） */
.module-visual {
    background: var(--om-paper);
    border: 1px solid var(--om-border);
    border-radius: var(--om-radius-xl);
    padding: 32px;
    box-shadow: var(--om-shadow-md);
    position: relative;
    overflow: hidden;
}
.module-visual::before {
    content: '';
    position: absolute;
    top: -100px; right: -100px;
    width: 220px; height: 220px;
    border-radius: 50%;
    background: var(--om-clay);
    opacity: 0.06;
    filter: blur(40px);
    pointer-events: none;
}
.module-visual svg.flow {
    width: 100%;
    height: auto;
    display: block;
}

/* ============================================================
   SVG 流程动画 · 12 秒序列循环（4 阶段 · 每阶段 3 秒）
   ============================================================ */
/* SVG 元素的 transform-origin 修正 */
.flow-ai .qr-dot,
.flow-ai .bubble,
.flow-ai .sparkle,
.flow-ai .halo,
.flow-form .field-check,
.flow-form .data-particle,
.flow-form .report-item {
    transform-box: fill-box;
    transform-origin: center;
}
.flow-form .bar {
    transform-box: fill-box;
    transform-origin: center bottom;
}

/* 阶段容器：初态隐藏 */
.flow-ai .stage,
.flow-form .stage {
    opacity: 0;
}

/* —— 阶段渐入渐出循环 —— */
/* 每个 stage 独占自己 25% 的时长窗口，剩余 75% 完全隐藏。
   通过 4 个不同的关键帧实现错开。 */
@keyframes omStage1 {
    0%   { opacity: 0; }
    3%   { opacity: 1; }
    22%  { opacity: 1; }
    25%  { opacity: 0; }
    100% { opacity: 0; }
}
@keyframes omStage2 {
    0%, 25% { opacity: 0; }
    28% { opacity: 1; }
    47% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 0; }
}
@keyframes omStage3 {
    0%, 50% { opacity: 0; }
    53% { opacity: 1; }
    72% { opacity: 1; }
    75% { opacity: 0; }
    100% { opacity: 0; }
}
@keyframes omStage4 {
    0%, 75% { opacity: 0; }
    78% { opacity: 1; }
    97% { opacity: 1; }
    100% { opacity: 0; }
}

.in-view .flow-ai .stage-1,
.in-view .flow-form .stage-1 { animation: omStage1 12s infinite ease-in-out; }
.in-view .flow-ai .stage-2,
.in-view .flow-form .stage-2 { animation: omStage2 12s infinite ease-in-out; }
.in-view .flow-ai .stage-3,
.in-view .flow-form .stage-3 { animation: omStage3 12s infinite ease-in-out; }
.in-view .flow-ai .stage-4,
.in-view .flow-form .stage-4 { animation: omStage4 12s infinite ease-in-out; }

/* —— 进度指示器（4 个圆点轮流高亮） —— */
.in-view .flow-ai .sd-1,
.in-view .flow-form .sd-1 { animation: dotStage1 12s infinite ease-in-out; }
.in-view .flow-ai .sd-2,
.in-view .flow-form .sd-2 { animation: dotStage2 12s infinite ease-in-out; }
.in-view .flow-ai .sd-3,
.in-view .flow-form .sd-3 { animation: dotStage3 12s infinite ease-in-out; }
.in-view .flow-ai .sd-4,
.in-view .flow-form .sd-4 { animation: dotStage4 12s infinite ease-in-out; }

@keyframes dotStage1 {
    0%   { fill: var(--om-border-strong); }
    3%   { fill: var(--om-clay); }
    22%  { fill: var(--om-clay); }
    25%  { fill: var(--om-border-strong); }
    100% { fill: var(--om-border-strong); }
}
@keyframes dotStage2 {
    0%, 25% { fill: var(--om-border-strong); }
    28% { fill: var(--om-clay); }
    47% { fill: var(--om-clay); }
    50% { fill: var(--om-border-strong); }
    100% { fill: var(--om-border-strong); }
}
@keyframes dotStage3 {
    0%, 50% { fill: var(--om-border-strong); }
    53% { fill: var(--om-clay); }
    72% { fill: var(--om-clay); }
    75% { fill: var(--om-border-strong); }
    100% { fill: var(--om-border-strong); }
}
@keyframes dotStage4 {
    0%, 75% { fill: var(--om-border-strong); }
    78% { fill: var(--om-clay); }
    97% { fill: var(--om-clay); }
    100% { fill: var(--om-border-strong); }
}

/* ============================================================
   AI 导师 Flow · 内部元素动画
   ============================================================ */

/* Stage 1: 提示词逐行书写（0-25%，3 行错开） */
.flow-ai .prompt-line {
    stroke-dasharray: 270;
    stroke-dashoffset: 270;
}
.in-view .flow-ai .pl-1 { animation: aiPromptLine 12s infinite ease-out; animation-delay: 0.2s; }
.in-view .flow-ai .pl-2 { animation: aiPromptLine 12s infinite ease-out; animation-delay: 0.8s; }
.in-view .flow-ai .pl-3 { animation: aiPromptLine 12s infinite ease-out; animation-delay: 1.4s; }
@keyframes aiPromptLine {
    0%, 2% { stroke-dashoffset: 270; }
    10% { stroke-dashoffset: 0; }
    22% { stroke-dashoffset: 0; }
    25%, 100% { stroke-dashoffset: 270; }
}

.in-view .flow-ai .caret {
    animation: caretBlink 1s steps(2) infinite;
}
@keyframes caretBlink { 50% { opacity: 0; } }

/* Stage 2: AI 头像放大 + 光晕扩散 + 星星闪烁（25-50%） */
.flow-ai .halo {
    transform-box: fill-box;
    transform-origin: center;
    opacity: 0;
}
.in-view .flow-ai .h-1 { animation: aiHalo 12s infinite ease-out; }
.in-view .flow-ai .h-2 { animation: aiHalo 12s infinite ease-out; animation-delay: 0.25s; }
@keyframes aiHalo {
    0%, 27% { opacity: 0; transform: scale(0.7); }
    32% { opacity: 0.6; transform: scale(1); }
    47% { opacity: 0.6; transform: scale(1.1); }
    50% { opacity: 0; transform: scale(1.15); }
    100% { opacity: 0; transform: scale(0.7); }
}

.flow-ai .sparkle { opacity: 0; }
.in-view .flow-ai .sp-1 { animation: aiSparkle 12s infinite ease-in-out; animation-delay: 0.1s; }
.in-view .flow-ai .sp-2 { animation: aiSparkle 12s infinite ease-in-out; animation-delay: 0.4s; }
.in-view .flow-ai .sp-3 { animation: aiSparkle 12s infinite ease-in-out; animation-delay: 0.7s; }
@keyframes aiSparkle {
    0%, 28% { opacity: 0; transform: scale(0.4) rotate(0deg); }
    32% { opacity: 1; transform: scale(1) rotate(45deg); }
    47% { opacity: 1; transform: scale(1) rotate(90deg); }
    50% { opacity: 0; transform: scale(0.4) rotate(120deg); }
    100% { opacity: 0; transform: scale(0.4); }
}

/* Stage 3: QR 网格依次闪现（50-75%） */
.flow-ai .qr-dot { opacity: 0; }
.in-view .flow-ai .qr-dot { animation: aiQrPop 12s infinite ease-out; }
@keyframes aiQrPop {
    0%, 52% { opacity: 0; transform: scale(0.4); }
    56% { opacity: 1; transform: scale(1); }
    72% { opacity: 1; transform: scale(1); }
    75% { opacity: 0; transform: scale(1); }
    100% { opacity: 0; transform: scale(0.4); }
}
/* 21 个点（3 个角 + 18 个数据）逐个错开 */
.in-view .flow-ai .qr-dot:nth-child(1)  { animation-delay: 0s; }
.in-view .flow-ai .qr-dot:nth-child(2)  { animation-delay: 0.04s; }
.in-view .flow-ai .qr-dot:nth-child(3)  { animation-delay: 0.08s; }
.in-view .flow-ai .qr-dot:nth-child(4)  { animation-delay: 0.12s; }
.in-view .flow-ai .qr-dot:nth-child(5)  { animation-delay: 0.16s; }
.in-view .flow-ai .qr-dot:nth-child(6)  { animation-delay: 0.20s; }
.in-view .flow-ai .qr-dot:nth-child(7)  { animation-delay: 0.24s; }
.in-view .flow-ai .qr-dot:nth-child(8)  { animation-delay: 0.28s; }
.in-view .flow-ai .qr-dot:nth-child(9)  { animation-delay: 0.32s; }
.in-view .flow-ai .qr-dot:nth-child(10) { animation-delay: 0.36s; }
.in-view .flow-ai .qr-dot:nth-child(11) { animation-delay: 0.40s; }
.in-view .flow-ai .qr-dot:nth-child(12) { animation-delay: 0.44s; }
.in-view .flow-ai .qr-dot:nth-child(13) { animation-delay: 0.48s; }
.in-view .flow-ai .qr-dot:nth-child(14) { animation-delay: 0.52s; }
.in-view .flow-ai .qr-dot:nth-child(15) { animation-delay: 0.56s; }
.in-view .flow-ai .qr-dot:nth-child(16) { animation-delay: 0.60s; }
.in-view .flow-ai .qr-dot:nth-child(17) { animation-delay: 0.64s; }
.in-view .flow-ai .qr-dot:nth-child(18) { animation-delay: 0.68s; }
.in-view .flow-ai .qr-dot:nth-child(19) { animation-delay: 0.72s; }
.in-view .flow-ai .qr-dot:nth-child(20) { animation-delay: 0.76s; }
.in-view .flow-ai .qr-dot:nth-child(21) { animation-delay: 0.80s; }
.in-view .flow-ai .qr-dot:nth-child(22) { animation-delay: 0.84s; }

/* Stage 4: 对话气泡依次浮现（75-100%） */
.flow-ai .bubble { opacity: 0; transform: translateY(8px); }
.in-view .flow-ai .bb-1 { animation: aiBubble 12s infinite ease-out; animation-delay: 0.0s; }
.in-view .flow-ai .bb-2 { animation: aiBubble 12s infinite ease-out; animation-delay: 0.7s; }
.in-view .flow-ai .bb-3 { animation: aiBubble 12s infinite ease-out; animation-delay: 1.4s; }
@keyframes aiBubble {
    0%, 76% { opacity: 0; transform: translateY(8px); }
    80% { opacity: 1; transform: translateY(0); }
    97% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(0); }
}

/* ============================================================
   QuickForm Flow · 内部元素动画
   ============================================================ */

/* Stage 1: 字段填入 + 打勾（0-25%） */
.flow-form .field-fill {
    stroke-dasharray: 120;
    stroke-dashoffset: 120;
}
.in-view .flow-form .f1 { animation: formFieldFill 12s infinite ease-out; animation-delay: 0.3s; }
.in-view .flow-form .f2 { animation: formFieldFill 12s infinite ease-out; animation-delay: 0.9s; }
.in-view .flow-form .f3 { animation: formFieldFill 12s infinite ease-out; animation-delay: 1.5s; }
@keyframes formFieldFill {
    0%, 2% { stroke-dashoffset: 120; }
    8% { stroke-dashoffset: 0; }
    22% { stroke-dashoffset: 0; }
    25%, 100% { stroke-dashoffset: 120; }
}

.flow-form .field-check { opacity: 0; }
.in-view .flow-form .c1 { animation: formCheck 12s infinite ease-out; animation-delay: 0.7s; }
.in-view .flow-form .c2 { animation: formCheck 12s infinite ease-out; animation-delay: 1.3s; }
.in-view .flow-form .c3 { animation: formCheck 12s infinite ease-out; animation-delay: 1.9s; }
@keyframes formCheck {
    0%, 2% { opacity: 0; transform: scale(0.3); }
    5% { opacity: 1; transform: scale(1.2); }
    8% { opacity: 1; transform: scale(1); }
    22% { opacity: 1; transform: scale(1); }
    25%, 100% { opacity: 0; transform: scale(0.3); }
}

/* Stage 2: 数据粒子流动（25-50%） */
.flow-form .data-particle { opacity: 0; }
.in-view .flow-form .dp-1 { animation: formParticle 12s infinite ease-in-out; animation-delay: 3.0s; }
.in-view .flow-form .dp-2 { animation: formParticle 12s infinite ease-in-out; animation-delay: 3.3s; }
.in-view .flow-form .dp-3 { animation: formParticle 12s infinite ease-in-out; animation-delay: 3.6s; }
.in-view .flow-form .dp-4 { animation: formParticle 12s infinite ease-in-out; animation-delay: 3.9s; }
@keyframes formParticle {
    0%, 2% { opacity: 0; transform: translate(0, 0); }
    6% { opacity: 1; }
    18% { opacity: 1; transform: translate(140px, 0); }
    22% { opacity: 0; transform: translate(140px, 0); }
    100% { opacity: 0; transform: translate(0, 0); }
}

/* Stage 3: 柱状图弹性生长 + 饼图描边（50-75%） */
.flow-form .bar { transform: scaleY(0); }
.in-view .flow-form .bb-1 { animation: formBar 12s infinite cubic-bezier(0.34, 1.56, 0.64, 1); animation-delay: 6.4s; }
.in-view .flow-form .bb-2 { animation: formBar 12s infinite cubic-bezier(0.34, 1.56, 0.64, 1); animation-delay: 6.55s; }
.in-view .flow-form .bb-3 { animation: formBar 12s infinite cubic-bezier(0.34, 1.56, 0.64, 1); animation-delay: 6.7s; }
.in-view .flow-form .bb-4 { animation: formBar 12s infinite cubic-bezier(0.34, 1.56, 0.64, 1); animation-delay: 6.85s; }
@keyframes formBar {
    0%, 2% { transform: scaleY(0); }
    6% { transform: scaleY(1); }
    22% { transform: scaleY(1); }
    25%, 100% { transform: scaleY(0); }
}

/* 饼图弧：动画从隐藏到画出 64% 弧（圆周 276.46，剩 100 即 64%） */
.flow-form .pie-arc {
    stroke-dasharray: 276.46;
    stroke-dashoffset: 276.46;
}
.in-view .flow-form .pie-arc {
    animation: formPie 12s infinite ease-out;
    animation-delay: 6.6s;
}
@keyframes formPie {
    0%, 2%   { stroke-dashoffset: 276.46; }
    14%      { stroke-dashoffset: 99.5; }
    22%      { stroke-dashoffset: 99.5; }
    25%      { stroke-dashoffset: 276.46; }
    100%     { stroke-dashoffset: 276.46; }
}

/* Stage 4: AI 报告条目逐行浮现（75-100%） */
.flow-form .report-item { opacity: 0; }
.in-view .flow-form .ri-1 { animation: formReportLine 12s infinite ease-out; animation-delay: 9.2s; }
.in-view .flow-form .ri-2 { animation: formReportLine 12s infinite ease-out; animation-delay: 9.5s; }
.in-view .flow-form .ri-3 { animation: formReportLine 12s infinite ease-out; animation-delay: 9.8s; }
.in-view .flow-form .ri-4 { animation: formReportLine 12s infinite ease-out; animation-delay: 10.1s; }
@keyframes formReportLine {
    0%, 2% { opacity: 0; transform: translateX(-8px); }
    8% { opacity: 1; transform: translateX(0); }
    22% { opacity: 1; transform: translateX(0); }
    25%, 100% { opacity: 0; transform: translateX(0); }
}

/* ============================================================
   引导 Dock（Mac 风格 · 弧形托盘 + 悬停二维码）
   ============================================================ */
.dock-section {
    background: linear-gradient(180deg, var(--om-cream) 0%, var(--om-cream-soft) 100%);
    overflow: visible;
}
.dock-header {
    text-align: center;
    margin-bottom: 88px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}
.dock-header .section-eyebrow {
    margin-bottom: 18px;
}
.dock-header .section-sub {
    margin: 16px auto 0;
}

/* Dock 外层 */
.dock-wrap {
    position: relative;
    width: min(620px, 92vw);
    height: 140px;
    margin: 0 auto;
    /* 给 QR 浮出留出顶部空间，禁止裁剪 */
    overflow: visible;
}

/* Dock 弧形托盘 */
.dock-tray {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 110px;
    filter: drop-shadow(0 6px 18px rgba(20, 17, 12, 0.08));
}

/* Dock 图标横排 */
.dock-items {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 110px;
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    padding: 0 56px 16px;
}

/* —— 单个 Dock 项 —— */
.dock-item {
    --dy: 0;
    position: relative;
    width: 64px;
    flex: 0 0 64px;
    background: transparent;
    border: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transform: translateY(var(--dy)) scale(1);
    transform-origin: bottom center;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    font-family: inherit;
}
/* 拱形定位（中间高、两端低） */
.dock-item:nth-child(1),
.dock-item:nth-child(5) { --dy: -2px; }
.dock-item:nth-child(2),
.dock-item:nth-child(4) { --dy: -24px; }
.dock-item:nth-child(3) { --dy: -38px; }

/* 悬停目标本身 */
.dock-item:hover {
    transform: translateY(calc(var(--dy) - 18px)) scale(1.32);
    z-index: 30;
}
/* 紧邻一侧（前/后） */
.dock-item:hover + .dock-item,
.dock-item:has(+ .dock-item:hover) {
    transform: translateY(calc(var(--dy) - 8px)) scale(1.16);
    z-index: 20;
}
/* 隔一位（前/后） */
.dock-item:hover + .dock-item + .dock-item,
.dock-item:has(+ .dock-item + .dock-item:hover) {
    transform: translateY(calc(var(--dy) - 2px)) scale(1.04);
    z-index: 10;
}

/* —— 图标方块（圆角 squircle） —— */
.dock-icon {
    position: relative;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--om-paper);
    border: 1px solid var(--om-border);
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(20, 17, 12, 0.10),
                0 1px 1px rgba(20, 17, 12, 0.06);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}
.dock-item:hover .dock-icon {
    border-color: var(--om-clay);
    box-shadow: 0 12px 28px rgba(20, 17, 12, 0.18),
                0 4px 10px rgba(217, 119, 87, 0.20);
}
.dock-icon-img,
.dock-icon-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}
.dock-icon-img {
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.dock-icon-img.loaded { opacity: 1; }
.dock-icon-svg {
    transition: opacity 0.3s ease;
}
.dock-icon-img.loaded ~ .dock-icon-svg { opacity: 0; }

/* —— 图标下方文字标签（悬停才显示） —— */
.dock-item .dock-label {
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--om-font-serif);
    font-size: 0.78rem;
    color: var(--om-muted);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    letter-spacing: 0.02em;
}
.dock-item:hover .dock-label {
    opacity: 1;
    color: var(--om-clay-deep);
}

/* —— QR 弹出气泡 —— */
.qr-popup {
    position: absolute;
    bottom: calc(100% + 22px);
    left: 50%;
    width: 188px;
    background: var(--om-paper);
    border: 1px solid var(--om-border);
    border-radius: var(--om-radius-lg);
    padding: 14px;
    box-shadow: var(--om-shadow-lg);
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 8px) scale(0.96);
    transform-origin: bottom center;
    transition: opacity 0.22s ease,
                transform 0.32s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 50;
}
/* 小三角朝下指向图标 */
.qr-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0; height: 0;
    border-left: 9px solid transparent;
    border-right: 9px solid transparent;
    border-top: 10px solid var(--om-paper);
    filter: drop-shadow(0 1px 0 var(--om-border));
}
.dock-item:hover .qr-popup {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
    pointer-events: auto;
}

.qr-popup .qr-frame {
    width: 100%;
    aspect-ratio: 1;
    background: var(--om-cream-soft);
    border-radius: var(--om-radius);
    overflow: hidden;
    position: relative;
}
.qr-popup .qr-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.qr-popup .qr-img.loaded { opacity: 1; }
.qr-popup .qr-fallback {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--om-muted);
    font-family: var(--om-font-serif);
    font-size: 0.78rem;
    text-align: center;
    padding: 12px;
    transition: opacity 0.3s ease;
}
.qr-popup .qr-fallback svg {
    width: 28px;
    height: 28px;
    opacity: 0.45;
}
.qr-popup .qr-img.loaded ~ .qr-fallback {
    opacity: 0;
}

.qr-popup .qr-name {
    text-align: center;
    margin-top: 12px;
    font-family: var(--om-font-serif);
    font-size: 0.98rem;
    font-weight: 500;
    color: var(--om-ink);
    letter-spacing: 0.02em;
}
.qr-popup .qr-sub {
    text-align: center;
    margin-top: 2px;
    font-family: var(--om-font-serif);
    font-size: 0.76rem;
    font-weight: 400;
    color: var(--om-muted);
}

/* 提示文案 */
.dock-hint {
    text-align: center;
    margin-top: 60px;
    color: var(--om-muted);
    font-family: var(--om-font-serif);
    font-weight: 400;
    font-size: 0.92rem;
}

/* ============================================================
   页脚
   ============================================================ */
footer.footer {
    border-top: 1px solid var(--om-border);
    padding: 56px 0 36px;
    background: var(--om-cream);
}
.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 36px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-family: var(--om-font-serif);
    font-size: 1.2rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}
.footer-brand img { width: 28px; height: 28px; }
.footer-tagline {
    font-family: var(--om-font-serif);
    font-weight: 400;
    color: var(--om-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 36ch;
}
.footer-col h4 {
    font-family: var(--om-font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--om-muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.footer-col a {
    color: var(--om-ink-soft);
    font-size: 0.92rem;
    transition: color 0.15s ease;
}
.footer-col a:hover {
    color: var(--om-clay-deep);
}
.footer-bottom {
    border-top: 1px solid var(--om-border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--om-muted);
    font-family: var(--om-font-serif);
    font-weight: 400;
    font-size: 0.85rem;
}

/* ============================================================
   渐入动画（IntersectionObserver 触发）
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}
.reveal-stagger > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.reveal-stagger.in-view > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
.reveal-stagger.in-view > *:nth-child(2) { transition-delay: 0.15s; opacity: 1; transform: translateY(0); }
.reveal-stagger.in-view > *:nth-child(3) { transition-delay: 0.25s; opacity: 1; transform: translateY(0); }
.reveal-stagger.in-view > *:nth-child(4) { transition-delay: 0.35s; opacity: 1; transform: translateY(0); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 960px) {
    .hero-grid,
    .module-grid,
    .module-grid.reverse {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .module-grid.reverse > .module-visual {
        order: 0;
    }
    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 767px) {
    body { font-size: 14px; }

    .nav-links a:not(.nav-cta) { display: none; }
    .nav-links { gap: 6px; }

    section { padding: 64px 0; }

    .hero { padding-top: 110px; }
    .hero h1.om-display { font-size: clamp(2rem, 8vw, 2.6rem); }
    .hero-sub { font-size: 0.98rem; }

    .module-visual { padding: 20px; }

    .dock-wrap { width: 100%; height: 120px; }
    .dock-tray, .dock-items { height: 96px; }
    .dock-items { padding: 0 24px 14px; }
    .dock-item { width: 48px; flex-basis: 48px; }
    .dock-icon { width: 44px; height: 44px; border-radius: 11px; }
    .dock-item:nth-child(1), .dock-item:nth-child(5) { --dy: -2px; }
    .dock-item:nth-child(2), .dock-item:nth-child(4) { --dy: -16px; }
    .dock-item:nth-child(3) { --dy: -26px; }
    .dock-item:hover {
        transform: translateY(calc(var(--dy) - 14px)) scale(1.26);
    }
    .qr-popup { width: 160px; padding: 12px; bottom: calc(100% + 18px); }
    .dock-item .dock-label { font-size: 0.72rem; bottom: -20px; }

    .footer-inner { grid-template-columns: 1fr; gap: 28px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}