/* ====================== CSS 变量 ====================== */
    :root {
        --primary: #4F6EF7;
        --primary-light: #6B8AFF;
        --primary-dark: #3B5AE0;
        --primary-glow: rgba(79,110,247,.15);
        --accent: #7C5CFC;
        --accent-light: #A78BFA;
        --grad-primary: linear-gradient(135deg, #4F6EF7 0%, #7C5CFC 100%);
        --grad-hero: linear-gradient(160deg, #F0F4FF 0%, #FAFAFF 40%, #FFF 100%);
        --grad-glass: linear-gradient(135deg, rgba(255,255,255,.85) 0%, rgba(255,255,255,.65) 100%);
        --grad-card-hover: linear-gradient(135deg, rgba(79,110,247,.03) 0%, rgba(124,92,252,.03) 100%);
        --bg-w: #ffffff;
        --bg-subtle: #FAFAFF;
        --bg-section: #F5F7FF;
        --t-title: #0F172A;
        --t-sub: #64748B;
        --t-body: #334155;
        --t-muted: #94A3B8;
        --border-glass: rgba(255,255,255,.6);
        --border-subtle: rgba(79,110,247,.08);
        --border-card: rgba(226,232,240,.6);
        --shadow-glass: 0 8px 32px rgba(79,110,247,.08), 0 1px 2px rgba(0,0,0,.04);
        --shadow-card: 0 1px 3px rgba(0,0,0,.04), 0 4px 24px rgba(79,110,247,.06);
        --shadow-card-hover: 0 8px 40px rgba(79,110,247,.12), 0 2px 8px rgba(0,0,0,.04);
        --shadow-float: 0 20px 60px rgba(79,110,247,.1), 0 4px 16px rgba(0,0,0,.04);
        --shadow-btn: 0 4px 16px rgba(79,110,247,.25);
        --shadow-btn-hover: 0 8px 28px rgba(79,110,247,.35);
        --radius: 16px;
        --radius-lg: 24px;
        --radius-xl: 32px;
        --radius-sm: 12px;
        --radius-xs: 8px;
        --ease-spring: cubic-bezier(.34,1.56,.64,1);
        --ease-out: cubic-bezier(.16,1,.3,1);
    }

  

    /* ====================== 通用布局 ====================== */
    .ttk-w { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
    .ttk-section { padding: 88px 0; position: relative; overflow: hidden; }

    /* ====================== 滚动进场动画 ====================== */
    .reveal {
        opacity: 0;
        transform: translateY(32px);
        transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
    }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    .reveal-d1 { transition-delay: .1s; }
    .reveal-d2 { transition-delay: .2s; }
    .reveal-d3 { transition-delay: .3s; }
    .reveal-d4 { transition-delay: .4s; }
    .reveal-d5 { transition-delay: .5s; }

    /* ====================== 按钮 ====================== */
    .btn-primary {
        display: inline-flex; align-items: center; justify-content: center; gap: 8px;
        height: 52px; padding: 0 32px;
        background: var(--grad-primary);
        color: #fff; font-size: 15px; font-weight: 600;
        border: none; border-radius: 14px; cursor: pointer;
        text-decoration: none;
        box-shadow: var(--shadow-btn);
        transition: all .3s var(--ease-out);
        position: relative; overflow: hidden;
        letter-spacing: .01em;
    }
    .btn-primary::before {
        content: '';
        position: absolute; inset: 0;
        background: linear-gradient(135deg, rgba(255,255,255,.2) 0%, transparent 50%);
        opacity: 0; transition: opacity .3s;
    }
    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-btn-hover);
    }
    .btn-primary:hover::before { opacity: 1; }

    .btn-ghost {
        display: inline-flex; align-items: center; justify-content: center; gap: 8px;
        height: 52px; padding: 0 28px;
        background: rgba(255,255,255,.7);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        color: var(--primary); font-size: 15px; font-weight: 600;
        border: 1.5px solid rgba(79,110,247,.15); border-radius: 14px; cursor: pointer;
        text-decoration: none;
        transition: all .3s var(--ease-out);
        letter-spacing: .01em;
    }
    .btn-ghost:hover {
        background: rgba(79,110,247,.06);
        border-color: rgba(79,110,247,.3);
        transform: translateY(-2px);
    }

    /* ====================== 玻璃面板通用 ====================== */
    .glass-panel {
        background: var(--grad-glass);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--border-glass);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-glass);
    }

    /* ====================== 段落标题通用 ====================== */
    .sec-label {
        display: inline-flex; align-items: center; gap: 8px;
        background: linear-gradient(135deg, rgba(79,110,247,.08) 0%, rgba(124,92,252,.06) 100%);
        color: var(--primary);
        font-size: 13px; font-weight: 700;
        padding: 8px 18px;
        border-radius: 100px;
        margin-bottom: 24px;
        letter-spacing: .06em;
        text-transform: uppercase;
        border: 1px solid rgba(79,110,247,.1);
    }
    .sec-label svg { width: 14px; height: 14px; }
    .sec-title {
        font-size: 42px; font-weight: 800; color: var(--t-title);
        line-height: 1.2; margin-bottom: 20px;
        letter-spacing: -.03em;
    }
    .sec-title .hl { color: var(--primary); }
    .sec-title .hl-grad {
        background: var(--grad-primary);
        -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .sec-desc {
        font-size: 18px; color: var(--t-sub); line-height: 1.7;
        max-width: 560px; font-weight: 400;
    }
    .sec-header-center { text-align: center; margin-bottom: 64px; }
    .sec-header-center .sec-desc { margin: 0 auto; }

    /* ====================== 装饰 ====================== */
    .deco-orb {
        position: absolute; border-radius: 50%;
        pointer-events: none; z-index: 0;
        filter: blur(80px);
    }
    .deco-grid-dot {
        position: absolute; pointer-events: none; z-index: 0;
        width: 200px; height: 200px;
        background-image: radial-gradient(circle, rgba(79,110,247,.08) 1.2px, transparent 1.2px);
        background-size: 20px 20px;
        opacity: .5;
    }

    /* ====================== HERO ====================== */
    .hero {
        padding: 160px 0 10px;
        background: url('/images/new/ttalkbg.png') center center / cover no-repeat;
        position: relative;
        overflow: hidden;
        min-height: 96vh;
    }
    .hero::before {
        content: '';
        position: absolute;
        left: 0; right: 0; bottom: 0;
        height: 30%;
        background: linear-gradient(to top, #F0F4FF 0%, transparent 100%);
        z-index: 1;
    }
    .hero .ttk-w { position: relative; z-index: 3; }
    .hero-orb-1 {
        width: 600px; height: 600px;
        background: radial-gradient(circle, rgba(79,110,247,.12) 0%, transparent 70%);
        top: -200px; right: -100px;
    }
    .hero-orb-2 {
        width: 500px; height: 500px;
        background: radial-gradient(circle, rgba(124,92,252,.08) 0%, transparent 70%);
        bottom: -150px; left: -100px;
    }
    .hero-orb-3 {
        width: 300px; height: 300px;
        background: radial-gradient(circle, rgba(79,110,247,.06) 0%, transparent 70%);
        top: 40%; left: 50%;
    }

    .hero .ttk-w {
        display: flex; align-items: center; gap: 80px;
        position: relative; z-index: 2;
    }
    .hero-left { flex: 1; max-width: 520px; }
    .hero-left h1 {
        font-size: 52px; font-weight: 800; color: var(--t-title);
        line-height: 1.15; margin-bottom: 20px; letter-spacing: -.03em;
    }
    .hero-left h1 .hl {
        font-style: normal;
        background: var(--grad-primary);
        -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .hero-left .hero-sub {
        font-size: 18px; color: var(--t-sub); line-height: 1.7;
        margin-bottom: 40px; font-weight: 400;
    }
    .hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }

    /* Hero 信任指标 */
    .hero-trust {
        display: flex; align-items: center; gap: 24px;
    }
    .hero-trust-avatars {
        display: flex;
    }
    .hero-trust-avatars span {
        width: 36px; height: 36px; border-radius: 50%;
        border: 2.5px solid #fff;
        display: flex; align-items: center; justify-content: center;
        font-size: 12px; font-weight: 700; color: #fff;
        margin-left: -8px;
        box-shadow: 0 2px 8px rgba(0,0,0,.1);
    }
    .hero-trust-avatars span:first-child { margin-left: 0; }
    .hero-trust-text {
        font-size: 14px; color: var(--t-sub);
    }
    .hero-trust-text strong { color: var(--t-title); font-weight: 700; }

    /* Hero 右侧浮动面板组 */
    .hero-right {
        flex: 1; position: relative;
        min-height: 520px;
        perspective: 1200px;
    }

    /* 主聊天面板 */
    .hero-chat {
        position: absolute; top: 20px; left: 0;
        width: 380px;
        background: #fff;
        border-radius: var(--radius-lg);
        box-shadow: 0 20px 60px rgba(15,23,42,.08), 0 1px 3px rgba(0,0,0,.04);
        transform: rotateY(-4deg) rotateX(2deg);
        transition: transform .6s var(--ease-out), box-shadow .6s var(--ease-out);
        z-index: 3;
        overflow: hidden;
    }
    .hero-chat:hover {
        transform: rotateY(-1deg) rotateX(1deg);
        box-shadow: 0 24px 72px rgba(15,23,42,.1), 0 1px 3px rgba(0,0,0,.04);
    }
    .chat-bar {
        background: var(--grad-primary);
        padding: 16px 20px;
        display: flex; align-items: center; gap: 12px;
    }
    .chat-dots { display: flex; gap: 6px; }
    .chat-dots i {
        width: 10px; height: 10px; border-radius: 50%; display: block;
    }
    .chat-dots i:nth-child(1) { background: rgba(255,255,255,.3); }
    .chat-dots i:nth-child(2) { background: rgba(255,255,255,.3); }
    .chat-dots i:nth-child(3) { background: rgba(255,255,255,.3); }
    .chat-bar-title {
        color: rgba(255,255,255,.9); font-size: 13px; font-weight: 600;
        flex: 1; text-align: center;
    }
    .chat-bar-avatar {
        width: 28px; height: 28px; border-radius: 50%;
        background: rgba(255,255,255,.2);
        display: flex; align-items: center; justify-content: center;
    }
    .chat-bar-avatar svg { width: 18px; height: 18px; fill: #fff; }

    .chat-body { padding: 20px; }
    .msg {
        padding: 12px 16px; border-radius: 16px;
        font-size: 13.5px; line-height: 1.65; margin-bottom: 12px;
        max-width: 85%; position: relative;
        animation: msgIn .6s var(--ease-out) both;
    }
    .msg-bot {
        background: var(--bg-section);
        border-bottom-left-radius: 4px;
        color: var(--t-body);
    }
    .msg-user {
        background: var(--grad-primary);
        color: #fff; margin-left: auto;
        border-bottom-right-radius: 4px;
    }
    .msg:nth-child(2) { animation-delay: .3s; }
    .msg:nth-child(3) { animation-delay: .6s; }
    @keyframes msgIn {
        from { opacity: 0; transform: translateY(10px) scale(.97); }
        to   { opacity: 1; transform: translateY(0) scale(1); }
    }
    .msg-tags {
        display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px;
    }
    .msg-tags span {
        background: #fff; color: var(--primary);
        font-size: 12px; font-weight: 600; padding: 5px 12px;
        border-radius: 8px; border: 1px solid rgba(79,110,247,.12);
        cursor: pointer; transition: all .2s;
    }
    .msg-tags span:hover {
        background: rgba(79,110,247,.06);
        border-color: rgba(79,110,247,.25);
    }

    .chat-input {
        display: flex; align-items: center; gap: 10px;
        padding: 14px 20px;
        border-top: 1px solid rgba(226,232,240,.5);
    }
    .chat-input-field {
        flex: 1; height: 36px; padding: 0 14px;
        background: var(--bg-subtle);
        border: 1px solid transparent; border-radius: 10px;
        font-size: 13px; color: var(--t-muted);
        display: flex; align-items: center;
    }
    .chat-input-send {
        width: 36px; height: 36px; border-radius: 10px;
        background: var(--grad-primary);
        display: flex; align-items: center; justify-content: center;
        box-shadow: 0 2px 8px rgba(79,110,247,.3);
    }
    .chat-input-send svg { width: 16px; height: 16px; fill: #fff; }

    /* 浮动玻璃面板 */
    .hero-float {
        position: absolute;
        background: rgba(255,255,255,.85);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid rgba(255,255,255,.7);
        border-radius: var(--radius);
        padding: 18px 22px;
        box-shadow: var(--shadow-float);
        z-index: 4;
        animation: heroFloat 6s ease-in-out infinite;
    }
    .hero-float-1 { top: 0; right: 10px; animation-delay: 0s; }
    .hero-float-2 { bottom: 80px; right: -10px; animation-delay: 2s; }
    .hero-float-3 { bottom: 20px; left: 30px; animation-delay: 4s; }
    .hero-float .hf-num {
        font-size: 28px; font-weight: 800; letter-spacing: -.03em;
        background: var(--grad-primary);
        -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .hero-float .hf-label {
        font-size: 12px; color: var(--t-sub); margin-top: 2px; font-weight: 500;
    }
    .hero-float .hf-bar {
        width: 100%; height: 4px; background: rgba(79,110,247,.1);
        border-radius: 2px; margin-top: 8px; overflow: hidden;
    }
    .hero-float .hf-bar-fill {
        height: 100%; border-radius: 2px;
        background: var(--grad-primary);
    }

    @keyframes heroFloat {
        0%, 100% { transform: translateY(0); }
        50% { transform: translateY(-10px); }
    }

    /* ====================== Logo 信任墙 ====================== */
    .trust-bar {
        padding: 48px 0;
        background: var(--bg-w);
        border-top: 1px solid rgba(226,232,240,.5);
        border-bottom: 1px solid rgba(226,232,240,.5);
        overflow: hidden;
        position: relative;
    }
    .trust-bar::before, .trust-bar::after {
        content: '';
        position: absolute; top: 0; width: 120px; height: 100%;
        z-index: 2;
    }
    .trust-bar::before {
        left: 0;
        background: linear-gradient(90deg, #fff 0%, transparent 100%);
    }
    .trust-bar::after {
        right: 0;
        background: linear-gradient(90deg, transparent 0%, #fff 100%);
    }
    .trust-bar h4 {
        text-align: center; font-size: 13px; color: var(--t-muted);
        font-weight: 500; margin-bottom: 28px; letter-spacing: .05em;
        text-transform: uppercase;
    }
    .trust-track {
        display: flex; gap: 40px;
        animation: trustScroll 30s linear infinite;
        width: max-content;
    }
    .trust-item {
        flex-shrink: 0;
        padding: 10px 28px;
        background: var(--bg-subtle);
        border-radius: 12px;
        border: 1px solid rgba(226,232,240,.4);
        font-size: 14px; font-weight: 600; color: var(--t-sub);
        white-space: nowrap;
        transition: all .3s;
    }
    .trust-item:hover {
        background: #fff;
        border-color: rgba(79,110,247,.15);
        box-shadow: var(--shadow-card);
        color: var(--t-title);
    }
    @keyframes trustScroll {
        0% { transform: translateX(0); }
        100% { transform: translateX(-50%); }
    }

    /* ====================== 产品定位 ====================== */
    .intro-sec {
        background: linear-gradient(180deg, #F0F4FF 0%, #F7F8FF 100%);
    }
    .intro-wrap {
        max-width: 960px; margin: 0 auto; text-align: center;
        background: #fff;
        border-radius: var(--radius-xl);
        padding: 64px 56px;
        box-shadow: 0 4px 32px rgba(79,110,247,.06), 0 1px 2px rgba(0,0,0,.03);
        border: 1px solid rgba(226,232,240,.5);
    }
    .intro-wrap .sec-title {
        font-size: 36px; white-space: nowrap;
    }
    .intro-wrap .intro-body {
        font-size: 17px; color: var(--t-body); line-height: 1.9;
        margin-bottom: 48px;
    }
    .intro-wrap .intro-body strong {
        color: var(--primary); font-weight: 700;
    }
    .intro-pills {
        display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
    }
    .intro-pill {
        display: flex; align-items: center; gap: 10px;
        padding: 14px 24px;
        background: var(--bg-section);
        border: 1px solid var(--border-card);
        border-radius: 14px;
        transition: all .3s var(--ease-out);
        cursor: default;
    }
    .intro-pill:hover {
        border-color: rgba(79,110,247,.2);
        box-shadow: var(--shadow-card);
        transform: translateY(-2px);
    }
    .intro-pill-icon {
        width: 36px; height: 36px;
        background: linear-gradient(135deg, rgba(79,110,247,.1) 0%, rgba(124,92,252,.08) 100%);
        border-radius: 10px;
        display: flex; align-items: center; justify-content: center;
    }
    .intro-pill-icon svg { width: 18px; height: 18px; fill: var(--primary); }
    .intro-pill span { font-size: 14px; color: var(--t-title); font-weight: 600; }

    /* ====================== 三大优势 ====================== */
    .adv-sec { background: var(--bg-w); }
    .adv-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .adv-card {
        border-radius: 20px;
        padding: 40px 32px 36px;
        transition: all .4s var(--ease-out);
        position: relative;
        overflow: hidden;
        border: none;
    }
    .adv-card:hover {
        transform: translateY(-6px);
    }
    /* 三张卡片各自的柔和粉彩背景 */
    .adv-card.adv-blue { background: #EEF4FF; }
    .adv-card.adv-purple { background: #F3EEFF; }
    .adv-card.adv-green { background: #EEFBF4; }

    .adv-card-num {
        display: inline-flex; align-items: center; justify-content: center;
        width: 52px; height: 52px;
        border-radius: 14px;
        font-size: 20px; font-weight: 800;
        line-height: 1; margin-bottom: 22px;
        letter-spacing: -.02em;
    }
    .adv-blue .adv-card-num { background: #D6E4FF; color: #3B6CF5; }
    .adv-purple .adv-card-num { background: #E4D9FF; color: #7B5CFC; }
    .adv-green .adv-card-num { background: #C9F5DC; color: #1AAB5C; }

    .adv-card h3 {
        font-size: 20px; font-weight: 700; color: var(--t-title);
        margin-bottom: 10px; line-height: 1.4;
    }
    .adv-card p {
        font-size: 14px; color: var(--t-sub); line-height: 1.75;
        margin-bottom: 28px;
    }

    /* 卡片内 UI 模拟插图 */
    .adv-mockup {
        background: #fff;
        border-radius: 14px;
        padding: 18px;
        box-shadow: 0 4px 20px rgba(0,0,0,.06);
    }
    .adv-mock-bar {
        display: flex; align-items: center; gap: 6px;
        margin-bottom: 14px;
    }
    .adv-mock-bar i {
        width: 8px; height: 8px; border-radius: 50%; display: block;
    }
    .adv-blue .adv-mock-bar i { background: rgba(59,108,245,.25); }
    .adv-purple .adv-mock-bar i { background: rgba(123,92,252,.25); }
    .adv-green .adv-mock-bar i { background: rgba(26,171,92,.25); }
    .adv-mock-bar span {
        font-size: 11px; font-weight: 600; margin-left: auto;
    }
    .adv-blue .adv-mock-bar span { color: #3B6CF5; }
    .adv-purple .adv-mock-bar span { color: #7B5CFC; }
    .adv-green .adv-mock-bar span { color: #1AAB5C; }

    /* 模拟行 */
    .adv-mock-row {
        display: flex; align-items: center; gap: 10px;
        padding: 10px 0;
        border-bottom: 1px solid rgba(0,0,0,.04);
    }
    .adv-mock-row:last-child { border-bottom: none; }
    .adv-mock-dot {
        width: 32px; height: 32px; border-radius: 8px; flex-shrink: 0;
    }
    .adv-blue .adv-mock-dot { background: #D6E4FF; }
    .adv-purple .adv-mock-dot { background: #E4D9FF; }
    .adv-green .adv-mock-dot { background: #C9F5DC; }
    .adv-mock-lines { flex: 1; }
    .adv-mock-line {
        height: 6px; border-radius: 3px; margin-bottom: 5px;
    }
    .adv-mock-line:last-child { margin-bottom: 0; }
    .adv-blue .adv-mock-line { background: rgba(59,108,245,.1); }
    .adv-purple .adv-mock-line { background: rgba(123,92,252,.1); }
    .adv-green .adv-mock-line { background: rgba(26,171,92,.1); }
    .adv-mock-line.w80 { width: 80%; }
    .adv-mock-line.w60 { width: 60%; }
    .adv-mock-line.w70 { width: 70%; }
    .adv-mock-line.w50 { width: 50%; }
    .adv-mock-line.w90 { width: 90%; }

    /* 模拟标签 */
    .adv-mock-tags {
        display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px;
    }
    .adv-mock-tag {
        padding: 5px 12px; border-radius: 6px;
        font-size: 11px; font-weight: 600;
    }
    .adv-blue .adv-mock-tag { background: #D6E4FF; color: #3B6CF5; }
    .adv-purple .adv-mock-tag { background: #E4D9FF; color: #7B5CFC; }
    .adv-green .adv-mock-tag { background: #C9F5DC; color: #1AAB5C; }

    /* 模拟进度/量表 */
    .adv-mock-gauge {
        display: flex; align-items: center; gap: 10px; margin-top: 12px;
    }
    .adv-gauge-track {
        flex: 1; height: 8px; border-radius: 4px; overflow: hidden;
    }
    .adv-blue .adv-gauge-track { background: #D6E4FF; }
    .adv-purple .adv-gauge-track { background: #E4D9FF; }
    .adv-green .adv-gauge-track { background: #C9F5DC; }
    .adv-gauge-fill { height: 100%; border-radius: 4px; }
    .adv-blue .adv-gauge-fill { background: #3B6CF5; }
    .adv-purple .adv-gauge-fill { background: #7B5CFC; }
    .adv-green .adv-gauge-fill { background: #1AAB5C; }
    .adv-gauge-val {
        font-size: 13px; font-weight: 700;
    }
    .adv-blue .adv-gauge-val { color: #3B6CF5; }
    .adv-purple .adv-gauge-val { color: #7B5CFC; }
    .adv-green .adv-gauge-val { color: #1AAB5C; }

    /* ====================== 产品功能 ====================== */
    .func-sec { background: var(--bg-w); }
    .func-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
        margin-bottom: 72px;
    }
    .func-card {
        background: #fff;
        border: 1px solid var(--border-card);
        border-radius: var(--radius);
        padding: 36px 32px;
        display: flex; gap: 20px;
        transition: all .35s var(--ease-out);
        position: relative;
        overflow: hidden;
    }
    .func-card::after {
        content: '';
        position: absolute; inset: 0;
        background: var(--grad-card-hover);
        opacity: 0; transition: opacity .3s;
        pointer-events: none;
    }
    .func-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-card-hover);
        border-color: rgba(79,110,247,.12);
    }
    .func-card:hover::after { opacity: 1; }
    .func-icon {
        flex-shrink: 0;
        width: 52px; height: 52px;
        background: var(--grad-primary);
        border-radius: 14px;
        display: flex; align-items: center; justify-content: center;
        box-shadow: 0 4px 12px rgba(79,110,247,.2);
    }
    .func-icon svg { width: 24px; height: 24px; fill: none; stroke: #fff; }
    .func-text h3 {
        font-size: 17px; font-weight: 700; color: var(--t-title);
        margin-bottom: 8px;
    }
    .func-text p {
        font-size: 14px; color: var(--t-sub); line-height: 1.7; margin-bottom: 14px;
    }
    .func-tag {
        display: inline-flex; align-items: center; gap: 6px;
        background: linear-gradient(135deg, rgba(79,110,247,.06) 0%, rgba(124,92,252,.04) 100%);
        padding: 8px 14px; border-radius: 8px;
        font-size: 12.5px; color: var(--t-body); font-weight: 500; line-height: 1.5;
    }
    .func-tag svg { width: 14px; height: 14px; fill: none; stroke: var(--primary); flex-shrink: 0; }

    /* 架构图 */
    .arch-box {
        border-radius: var(--radius-lg);
        padding: 44px 40px;
        position: relative;
        overflow: hidden;
        background: linear-gradient(180deg, #F0F4FF 0%, #F7F8FF 100%);
        border: 1px solid rgba(79,110,247,.1);
    }
    .arch-box::before {
        content: '';
        position: absolute; inset: 0;
        background: linear-gradient(180deg, rgba(79,110,247,.06) 0%, rgba(124,92,252,.04) 100%);
        pointer-events: none;
    }
    .arch-head { text-align: center; margin-bottom: 32px; position: relative; z-index: 1; }
    .arch-head h3 { font-size: 20px; font-weight: 700; color: var(--t-title); margin-bottom: 6px; }
    .arch-head p { font-size: 14px; color: var(--t-sub); }
    .arch-stack {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
        position: relative; z-index: 1;
    }
    .arch-row {
        display: flex; flex-direction: column; align-items: center; gap: 14px;
        padding: 24px 20px;
        border-radius: 14px;
        text-align: center;
    }
    .arch-row.top {
        background: var(--grad-primary);
        color: #fff; box-shadow: 0 4px 20px rgba(79,110,247,.2);
    }
    .arch-row.mid {
        background: rgba(79,110,247,.04);
        border: 1px dashed rgba(79,110,247,.15);
    }
    .arch-row.bot {
        background: #fff;
        border: 1px solid var(--border-card);
    }
    .arch-row-label {
        font-size: 13px; font-weight: 700; white-space: nowrap;
    }
    .arch-chips { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
    .arch-chip {
        padding: 7px 16px; border-radius: 8px;
        font-size: 12.5px; font-weight: 600;
    }
    .top .arch-chip { background: rgba(255,255,255,.18); color: #fff; }
    .mid .arch-chip { background: rgba(79,110,247,.08); color: var(--primary); }
    .bot .arch-chip { background: var(--bg-subtle); color: var(--t-body); }
    .arch-divider { display: none; }

    /* ====================== 场景解决方案 ====================== */
    .scene-sec { background: var(--bg-subtle); }

    /* Tab 导航 */
    .scene-tabs {
        display: flex; gap: 12px; justify-content: center;
        margin-bottom: 48px;
    }
    .scene-tab {
        padding: 14px 32px;
        background: #fff;
        border: 2px solid var(--border-card);
        border-radius: 12px;
        font-size: 15px; font-weight: 600; color: var(--t-sub);
        cursor: pointer;
        transition: all .3s var(--ease-out);
        position: relative;
    }
    .scene-tab:hover {
        border-color: rgba(79,110,247,.2);
        color: var(--t-title);
    }
    .scene-tab.active {
        background: var(--grad-primary);
        border-color: transparent;
        color: #fff;
        box-shadow: 0 4px 16px rgba(79,110,247,.25);
    }
    .scene-tab-num {
        display: inline-flex; align-items: center; justify-content: center;
        width: 24px; height: 24px; border-radius: 50%;
        background: rgba(79,110,247,.1);
        color: var(--primary);
        font-size: 12px; font-weight: 800;
        margin-right: 8px;
    }
    .scene-tab.active .scene-tab-num {
        background: rgba(255,255,255,.25);
        color: #fff;
    }

    /* Tab 内容面板 */
    .scene-panels { position: relative; min-height: 500px; }
    .scene-panel {
        display: none;
        opacity: 0;
        animation: sceneFadeIn .5s var(--ease-out) forwards;
    }
    .scene-panel.active { display: block; }
    @keyframes sceneFadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .scene-card {
        display: flex;
        background: #fff;
        border-radius: var(--radius-xl);
        overflow: hidden;
        border: 1px solid var(--border-card);
        box-shadow: 0 4px 24px rgba(0,0,0,.06);
    }
    .scene-vis {
        flex: 0 0 42%; min-height: 360px;
        position: relative; overflow: hidden;
        display: flex; align-items: center; justify-content: center;
    }
    .scene-vis.v1 { background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%); }
    .scene-vis.v2 { background: linear-gradient(135deg, #EDE9FE 0%, #E0E7FF 100%); }
    .scene-vis.v3 { background: linear-gradient(135deg, #E0E7FF 0%, #DBEAFE 100%); }

    /* 场景 UI 模拟 */
    .scene-mock { width: 280px; position: relative; }

    /* —— 场景1: 多渠道接入仪表盘 —— */
    .scene-mock-dashboard {
        background: #fff; border-radius: 16px;
        box-shadow: 0 12px 40px rgba(79,110,247,.12), 0 2px 8px rgba(0,0,0,.04);
        overflow: hidden; width: 260px;
    }
    .smd-bar {
        height: 32px; background: var(--grad-primary);
        display: flex; align-items: center; padding: 0 14px; gap: 5px;
    }
    .smd-bar i { width: 7px; height: 7px; border-radius: 50%; background: rgba(255,255,255,.35); display: block; }
    .smd-bar span { color: rgba(255,255,255,.85); font-size: 11px; font-weight: 600; margin-left: auto; }
    .smd-body { padding: 16px; }
    .smd-channels { display: flex; gap: 8px; margin-bottom: 14px; }
    .smd-ch {
        flex: 1; text-align: center; padding: 10px 4px;
        background: #F0F4FF; border-radius: 10px;
        font-size: 10px; font-weight: 600; color: var(--primary);
    }
    .smd-ch-icon {
        width: 28px; height: 28px; border-radius: 8px; margin: 0 auto 6px;
        background: var(--grad-primary);
        display: flex; align-items: center; justify-content: center;
    }
    .smd-ch-icon svg { width: 14px; height: 14px; fill: #fff; }
    .smd-stat-row { display: flex; gap: 8px; }
    .smd-stat {
        flex: 1; padding: 10px; border-radius: 8px;
        background: #FAFAFF;
    }
    .smd-stat-num { font-size: 18px; font-weight: 800; color: var(--primary); }
    .smd-stat-label { font-size: 10px; color: var(--t-sub); margin-top: 2px; }

    /* —— 场景2: 语料问答对话 —— */
    .scene-mock-chat {
        width: 250px;
    }
    .smc-bubble {
        padding: 12px 16px; border-radius: 14px;
        font-size: 12px; line-height: 1.6; margin-bottom: 10px;
        max-width: 90%; position: relative;
        box-shadow: 0 4px 16px rgba(0,0,0,.05);
    }
    .smc-bubble.bot {
        background: #fff; color: var(--t-body);
        border-bottom-left-radius: 4px;
        margin-right: auto;
    }
    .smc-bubble.user {
        background: var(--grad-primary); color: #fff;
        border-bottom-right-radius: 4px;
        margin-left: auto;
    }
    .smc-bubble .smc-tag {
        display: inline-block; margin-top: 6px;
        padding: 3px 10px; border-radius: 6px;
        background: rgba(79,110,247,.08); color: var(--primary);
        font-size: 10px; font-weight: 600;
    }
    .smc-typing {
        display: flex; gap: 4px; align-items: center;
        padding: 10px 16px; background: #fff;
        border-radius: 14px; border-bottom-left-radius: 4px;
        width: fit-content;
        box-shadow: 0 4px 16px rgba(0,0,0,.05);
    }
    .smc-typing i {
        width: 6px; height: 6px; border-radius: 50%;
        background: var(--primary); opacity: .4; display: block;
        animation: typingDot 1.4s ease-in-out infinite;
    }
    .smc-typing i:nth-child(2) { animation-delay: .2s; }
    .smc-typing i:nth-child(3) { animation-delay: .4s; }
    @keyframes typingDot {
        0%, 60%, 100% { opacity: .25; transform: translateY(0); }
        30% { opacity: 1; transform: translateY(-4px); }
    }

    /* —— 场景3: 营销留资表单 —— */
    .scene-mock-form {
        background: #fff; border-radius: 16px;
        box-shadow: 0 12px 40px rgba(79,110,247,.12), 0 2px 8px rgba(0,0,0,.04);
        overflow: hidden; width: 240px;
    }
    .smf-header {
        padding: 16px 18px;
        background: linear-gradient(135deg, #E0E7FF, #DBEAFE);
        text-align: center;
    }
    .smf-header span {
        font-size: 12px; font-weight: 700; color: var(--primary);
    }
    .smf-body { padding: 16px 18px; }
    .smf-field {
        margin-bottom: 10px;
    }
    .smf-field label {
        display: block; font-size: 10px; font-weight: 600;
        color: var(--t-sub); margin-bottom: 4px;
    }
    .smf-field-input {
        width: 100%; height: 32px; border-radius: 8px;
        background: #F5F7FF; border: 1px solid rgba(79,110,247,.1);
        padding: 0 10px; font-size: 11px; color: var(--t-muted);
        display: flex; align-items: center;
    }
    .smf-btn {
        width: 100%; height: 34px; border-radius: 8px;
        background: var(--grad-primary); color: #fff;
        font-size: 12px; font-weight: 700;
        display: flex; align-items: center; justify-content: center;
        margin-top: 14px;
        box-shadow: 0 4px 12px rgba(79,110,247,.25);
    }
    .smf-success {
        position: absolute; top: -14px; right: -14px;
        width: 40px; height: 40px; border-radius: 50%;
        background: #10B981; color: #fff;
        display: flex; align-items: center; justify-content: center;
        box-shadow: 0 4px 12px rgba(16,185,129,.3);
        animation: heroFloat 4s ease-in-out infinite;
    }
    .smf-success svg { width: 20px; height: 20px; fill: #fff; }
    .smf-counter {
        position: absolute; bottom: -10px; left: -10px;
        background: #fff; border-radius: 10px;
        padding: 8px 14px; box-shadow: 0 4px 16px rgba(0,0,0,.08);
        font-size: 11px; font-weight: 700; color: var(--primary);
        animation: heroFloat 5s ease-in-out infinite;
        animation-delay: 1.5s;
    }

    .scene-body {
        flex: 1; padding: 52px 48px;
        display: flex; flex-direction: column; justify-content: center;
    }
    .scene-num {
        display: inline-flex; align-items: center; justify-content: center;
        width: 36px; height: 36px;
        background: var(--grad-primary);
        color: #fff; font-size: 15px; font-weight: 800;
        border-radius: 12px; margin-bottom: 18px;
        box-shadow: 0 4px 12px rgba(79,110,247,.2);
    }
    .scene-body h3 {
        font-size: 24px; font-weight: 700; color: var(--t-title);
        margin-bottom: 14px; line-height: 1.35;
    }
    .scene-pain {
        font-size: 14px; color: var(--t-sub); line-height: 1.8;
        margin-bottom: 20px;
        padding-left: 16px;
        border-left: 3px solid rgba(79,110,247,.2);
    }
    .scene-sol h4 {
        font-size: 15px; font-weight: 700; color: var(--t-title); margin-bottom: 8px;
    }
    .scene-sol p {
        font-size: 14px; color: var(--t-body); line-height: 1.7; margin-bottom: 18px;
    }
    .scene-val {
        background: linear-gradient(135deg, rgba(79,110,247,.04) 0%, rgba(124,92,252,.04) 100%);
        border-radius: 12px;
        padding: 16px 20px; margin-bottom: 24px;
    }
    .scene-val p { font-size: 13.5px; color: var(--t-body); line-height: 1.65; }
    .scene-val strong { color: var(--primary); font-weight: 700; }
    .scene-cta .btn-primary { height: 46px; font-size: 14px; padding: 0 24px; border-radius: 12px; }

    /* ====================== 客户成功 ====================== */
    .case-sec { background: var(--bg-w); }
    .case-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
        margin-bottom: 72px;
    }
    .case-card {
        background: #fff;
        border: 1px solid var(--border-card);
        border-radius: var(--radius-lg);
        padding: 44px 36px;
        transition: all .4s var(--ease-out);
        position: relative;
        overflow: hidden;
    }
    .case-card::before {
        content: '';
        position: absolute; top: 0; left: 0; right: 0; height: 4px;
        background: var(--grad-primary);
        border-radius: 4px 4px 0 0;
    }
    .case-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-card-hover);
    }
    .case-badge {
        display: inline-flex; align-items: center; gap: 6px;
        background: linear-gradient(135deg, rgba(79,110,247,.08) 0%, rgba(124,92,252,.06) 100%);
        padding: 6px 14px; border-radius: 100px;
        font-size: 12px; color: var(--primary); font-weight: 700;
        margin-bottom: 20px;
        border: 1px solid rgba(79,110,247,.1);
    }
    .case-badge svg { width: 13px; height: 13px; }
    .case-card h3 {
        font-size: 18px; font-weight: 700; color: var(--t-title); margin-bottom: 14px;
    }
    .case-card .case-desc {
        font-size: 13.5px; color: var(--t-sub); line-height: 1.8; margin-bottom: 20px;
    }
    .case-result {
        background: linear-gradient(135deg, rgba(79,110,247,.04), rgba(124,92,252,.03));
        border-left: 3px solid var(--primary);
        padding: 16px 20px;
        border-radius: 0 12px 12px 0;
    }
    .case-result p { font-size: 13px; color: var(--t-body); line-height: 1.7; }
    .case-result strong { color: var(--primary); }

    /* Logo 墙 */
    .logo-wall {overflow: hidden; position: relative; }
    .logo-wall::before, .logo-wall::after {
        content: '';
        position: absolute; top: 0; width: 100px; height: 100%;
        z-index: 2; pointer-events: none;
    }
    .logo-wall::before { left: 0; background: linear-gradient(90deg, #fff 0%, transparent 100%); }
    .logo-wall::after { right: 0; background: linear-gradient(90deg, transparent 0%, #fff 100%); }
    .logo-wall h3 {
        text-align: center; font-size: 28px; color: #0F172A; font-weight: 700;
        margin-bottom: 36px; letter-spacing: -.01em;
    }
    .logo-scroll-track {
        display: flex; gap: 32px;
        animation: logoScroll 25s linear infinite;
        width: max-content;
    }
    .logo-slot {
        flex-shrink: 0;
        width: 160px; height: 64px;
        background: var(--bg-subtle);
        border: 1px dashed var(--border-card);
        border-radius: 12px;
        display: flex; align-items: center; justify-content: center;
        font-size: 13px; font-weight: 500; color: var(--t-muted);
        transition: all .3s var(--ease-out);
    }
    .logo-slot:hover {
        border-color: rgba(79,110,247,.2);
        border-style: solid;
        box-shadow: var(--shadow-card);
        color: var(--t-sub);
    }
    @keyframes logoScroll {
        0% { transform: translateX(0); }
        100% { transform: translateX(-50%); }
    }

    /* ====================== SaaS 订阅 ====================== */
    .saas-strip {
        text-align: center;
        padding: 64px 0;
        background: linear-gradient(135deg, rgba(79,110,247,.03) 0%, rgba(124,92,252,.03) 100%);
        border-top: 1px solid rgba(226,232,240,.4);
        border-bottom: 1px solid rgba(226,232,240,.4);
    }
    .saas-strip p {
        font-size: 18px; color: var(--t-title); line-height: 1.8;
        max-width: 720px; margin: 0 auto 28px;
    }
    .saas-strip p strong { color: var(--primary); font-weight: 700; }
    .saas-chips {
        display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
    }
    .saas-chip {
        padding: 12px 24px;
        background: rgba(255,255,255,.8);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border: 1px solid rgba(79,110,247,.1);
        border-radius: 100px;
        font-size: 14px; color: var(--primary); font-weight: 600;
        display: flex; align-items: center; gap: 8px;
    }
    .saas-chip svg { width: 16px; height: 16px; fill: var(--primary); }

    /* ====================== 响应式 ====================== */
    @media (max-width: 960px) {
        .hero .ttk-w { flex-direction: column; text-align: center; }
        .hero-left { max-width: 100%; }
        .hero-left h1 { font-size: 38px; }
        .hero-btns { justify-content: center; }
        .hero-trust { justify-content: center; }
        .hero-right { min-height: 400px; }
        .hero-chat { position: relative; top: 0; left: 0; margin: 0 auto; transform: none; }
        .hero-float { display: none; }
        .adv-grid { grid-template-columns: 1fr; }
        .intro-wrap { padding: 44px 28px; }
        .intro-wrap .sec-title { font-size: 26px; white-space: normal; }
        .func-grid { grid-template-columns: 1fr; }
        .scene-card, .scene-card:nth-child(even) { flex-direction: column; }
        .scene-vis { min-height: 220px; }
        .case-grid { grid-template-columns: 1fr; }
        .sec-title { font-size: 30px; }
        .ttk-section { padding: 80px 0; }
        .arch-row { flex-direction: column; text-align: center; }
        .arch-chips { justify-content: center; }
    }
    @media (max-width: 640px) {
        .hero { padding: 120px 0 60px; min-height: auto; }
        .hero-left h1 { font-size: 30px; }
        .sec-desc { font-size: 16px; }
        .intro-pills { flex-direction: column; align-items: center; }
        .logo-chip { padding: 10px 18px; font-size: 13px; }
        .saas-chips { flex-direction: column; align-items: center; }
    }

    /* 架构图图片容器样式 */
    .arch-image-container {
        position: relative;
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
    }
    .arch-image-wrapper {
        position: relative;
        padding: 32px;
        background: linear-gradient(135deg, rgba(79,110,247,.04) 0%, rgba(147,112,219,.02) 100%);
        border-radius: 20px;
        border: 2px solid rgba(79,110,247,.12);
        box-shadow:
            0 8px 32px rgba(79,110,247,.1),
            0 4px 16px rgba(79,110,247,.08),
            inset 0 1px 0 rgba(255,255,255,.5);
        backdrop-filter: blur(10px);
        overflow: hidden;
        transition: all .4s cubic-bezier(.4,0,.2,1);
    }
    .arch-image-wrapper::before {
        content: '';
        position: absolute;
        top: -3px; left: -3px; right: -3px; bottom: -3px;
        background: linear-gradient(135deg, rgba(79,110,247,.25), rgba(147,112,219,.2), rgba(79,110,247,.15));
        border-radius: 22px;
        z-index: -1;
        opacity: 0;
        transition: opacity .4s ease;
    }
    .arch-image-wrapper::after {
        content: '';
        position: absolute;
        top: 0; left: 0; right: 0; bottom: 0;
        background: radial-gradient(circle at 30% 50%, rgba(79,110,247,.08) 0%, transparent 50%),
                    radial-gradient(circle at 70% 50%, rgba(147,112,219,.06) 0%, transparent 50%);
        pointer-events: none;
        opacity: 0;
        transition: opacity .4s ease;
    }
    .arch-image-wrapper:hover {
        transform: translateY(-4px);
        box-shadow:
            0 16px 48px rgba(79,110,247,.15),
            0 8px 24px rgba(79,110,247,.12),
            inset 0 1px 0 rgba(255,255,255,.6);
        border-color: rgba(79,110,247,.2);
    }
    .arch-image-wrapper:hover::before {
        opacity: 1;
    }
    .arch-image-wrapper:hover::after {
        opacity: 1;
    }
    .arch-diagram-img {
        display: block;
        width: 100%;
        height: auto;
        border-radius: 12px;
        filter: drop-shadow(0 4px 12px rgba(0,0,0,.06));
        transition: filter .4s ease;
    }
    .arch-image-wrapper:hover .arch-diagram-img {
        filter: drop-shadow(0 6px 16px rgba(0,0,0,.1));
    }