/* ==========================================================================
   铭赞网络 · 抖音SEO优化 主样式表
   设计理念：精致·大气·科技感，符合抖音品牌调性
   ========================================================================== */

/* CSS 变量定义 */
:root {
    /* 主色 */
    --c-bg: #0B0E14;
    --c-bg-2: #0F141C;
    --c-bg-3: #1A1F2E;
    --c-surface: #FFFFFF;
    --c-surface-2: #F7F8FA;
    --c-surface-3: #EEF0F4;

    /* 文字 */
    --c-text: #0B0E14;
    --c-text-2: #3A4150;
    --c-text-3: #6A7382;
    --c-text-light: #C0C5CE;
    --c-text-light-2: #8A93A3;

    /* 强调色 */
    --c-primary: #FE2C55;          /* 抖音品牌粉 */
    --c-primary-2: #FF4A6E;
    --c-primary-3: #FFB8C6;
    --c-accent: #FFD580;           /* 金属高光 */
    --c-deep: #1A1F2E;             /* 冷调深蓝 */
    --c-line: rgba(11, 14, 20, 0.08);
    --c-line-2: rgba(255, 255, 255, 0.08);

    /* 渐变 */
    --g-primary: linear-gradient(135deg, #FE2C55 0%, #FF4A6E 50%, #FF7A95 100%);
    --g-primary-strong: linear-gradient(135deg, #E0274B 0%, #FE2C55 100%);
    --g-dark: linear-gradient(135deg, #0B0E14 0%, #1A1F2E 100%);
    --g-text: linear-gradient(135deg, #FE2C55 0%, #FFD580 100%);

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(11, 14, 20, 0.04);
    --shadow-md: 0 8px 24px rgba(11, 14, 20, 0.06);
    --shadow-lg: 0 20px 50px rgba(11, 14, 20, 0.10);
    --shadow-pink: 0 12px 32px rgba(254, 44, 85, 0.20);
    --shadow-glow: 0 0 0 1px rgba(254, 44, 85, 0.15), 0 8px 32px rgba(254, 44, 85, 0.18);

    /* 半径 */
    --r-xs: 4px;
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 20px;
    --r-xl: 28px;
    --r-full: 999px;

    /* 间距 */
    --container: 1280px;
    --gap-1: 4px;
    --gap-2: 8px;
    --gap-3: 12px;
    --gap-4: 16px;
    --gap-5: 24px;
    --gap-6: 32px;
    --gap-7: 48px;
    --gap-8: 64px;
    --gap-9: 96px;

    /* 字体 */
    --font-cn: "Noto Sans SC", "Source Han Sans CN", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Heiti SC", sans-serif;
    --font-en: "Inter", "Helvetica Neue", "Arial", sans-serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

    /* 缓动 */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-cn);
    font-size: 16px;
    line-height: 1.7;
    color: var(--c-text);
    background: var(--c-surface);
    overflow-x: hidden;
    font-feature-settings: "kern" 1, "liga" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s var(--ease);
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font: inherit;
    color: inherit;
}

ul, ol {
    list-style: none;
}

sup {
    font-size: 0.5em;
    vertical-align: super;
}

/* 容器 */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gap-5);
    width: 100%;
}

/* 顶部进度条 */
.top-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0;
    background: var(--g-primary);
    z-index: 9999;
    transition: width 0.1s linear;
    box-shadow: 0 0 10px rgba(254, 44, 85, 0.6);
}

/* 通用按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-2);
    padding: 14px 28px;
    border-radius: var(--r-full);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: all 0.4s var(--ease);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn-primary {
    background: var(--g-primary);
    color: #fff;
    box-shadow: var(--shadow-pink);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.6s var(--ease);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 40px rgba(254, 44, 85, 0.32);
}

.btn-primary:hover::before {
    transform: translateX(100%);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.04);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.16);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.32);
    transform: translateY(-2px);
}

/* ==========================================================================
   导航 + Banner 一体化
   ========================================================================== */
.hero {
    position: relative;
    background: var(--g-dark);
    color: #fff;
    overflow: hidden;
    isolation: isolate;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    animation: gridShift 20s linear infinite;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.bg-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #FE2C55 0%, transparent 70%);
    top: -200px;
    right: -100px;
    animation: floatA 18s ease-in-out infinite;
}

.bg-orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #FFB8C6 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    animation: floatB 22s ease-in-out infinite;
}

.bg-orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #FFD580 0%, transparent 70%);
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.3;
    animation: floatC 25s ease-in-out infinite;
}

.bg-noise {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
    opacity: 0.05;
    mix-blend-mode: overlay;
    pointer-events: none;
}

/* 导航 */
.navbar {
    position: relative;
    z-index: 10;
    padding: 20px 0;
    transition: all 0.4s var(--ease);
}

.navbar.scrolled {
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--c-line-2);
    padding: 12px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    animation: navSlideDown 0.4s var(--ease-out);
}

.nav-wrap {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gap-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-5);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--gap-2);
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 0.02em;
    flex-shrink: 0;
    transition: opacity 0.3s var(--ease);
}

.logo:hover {
    opacity: 0.85;
}

.logo-brand {
    display: inline-flex;
    align-items: baseline;
    color: #fff;
    position: relative;
}

.logo-cn {
    font-family: var(--font-cn);
    font-weight: 700;
    letter-spacing: 0.04em;
}

.logo-r {
    color: var(--c-primary);
    font-size: 0.5em;
    margin-left: 1px;
    font-weight: 600;
}

.logo-divider {
    color: rgba(255, 255, 255, 0.2);
    font-weight: 300;
    margin: 0 4px;
}

.logo-slogan {
    font-family: var(--font-cn);
    font-weight: 500;
    font-size: 15px;
    color: var(--c-primary-3);
    background: var(--g-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 0.02em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--r-full);
    padding: 4px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.nav-link {
    display: inline-block;
    padding: 8px 18px;
    border-radius: var(--r-full);
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s var(--ease);
    position: relative;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.06);
}

.nav-link.active {
    background: var(--g-primary);
    color: #fff;
}

.nav-cta {
    flex-shrink: 0;
}

.nav-phone {
    display: inline-flex;
    align-items: center;
    gap: var(--gap-2);
    padding: 10px 18px;
    border-radius: var(--r-full);
    background: rgba(254, 44, 85, 0.12);
    border: 1px solid rgba(254, 44, 85, 0.32);
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s var(--ease);
}

.nav-phone:hover {
    background: rgba(254, 44, 85, 0.24);
    border-color: var(--c-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: #fff;
    transition: all 0.3s var(--ease);
    transform-origin: center;
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(5.5px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-5.5px) rotate(-45deg);
}

/* Banner 主体 */
.hero-content {
    position: relative;
    z-index: 5;
    flex: 1;
    display: flex;
    align-items: center;
    padding: 60px 0 100px;
}

.hero-wrap {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gap-5);
    width: 100%;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--gap-9);
    align-items: center;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--gap-2);
    padding: 6px 14px;
    border-radius: var(--r-full);
    background: rgba(254, 44, 85, 0.1);
    border: 1px solid rgba(254, 44, 85, 0.25);
    font-size: 12px;
    font-weight: 500;
    color: var(--c-primary-3);
    letter-spacing: 0.05em;
    margin-bottom: var(--gap-5);
}

.tag-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--c-primary);
    box-shadow: 0 0 8px var(--c-primary);
    animation: pulse 2s ease-in-out infinite;
}

.hero-title {
    font-family: var(--font-cn);
    font-size: clamp(40px, 5.5vw, 68px);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.01em;
    color: #fff;
    margin-bottom: var(--gap-5);
}

.title-line {
    display: block;
}

.title-line em {
    font-style: normal;
    background: var(--g-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.title-line-sub {
    font-size: 0.45em;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.04em;
    margin-top: var(--gap-3);
    background: none;
    -webkit-text-fill-color: rgba(255, 255, 255, 0.7);
}

.hero-sub {
    font-size: 16px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.7);
    max-width: 560px;
    margin-bottom: var(--gap-6);
}

.hero-actions {
    display: flex;
    gap: var(--gap-3);
    flex-wrap: wrap;
    margin-bottom: var(--gap-7);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-5);
    max-width: 520px;
    padding-top: var(--gap-5);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-stats li {
    display: flex;
    flex-direction: column;
}

.hero-stats strong {
    font-family: var(--font-en);
    font-size: 32px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    line-height: 1;
    display: inline-flex;
    align-items: baseline;
}

.hero-stats .suffix {
    font-size: 16px;
    color: var(--c-primary-3);
    margin-left: 2px;
    font-weight: 600;
}

.hero-stats .label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: var(--gap-2);
    letter-spacing: 0.04em;
}

/* Banner 视觉卡片 */
.hero-visual {
    position: relative;
}

.visual-card {
    position: relative;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--r-lg);
    padding: var(--gap-5);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform 0.6s var(--ease);
    animation: cardFloat 6s ease-in-out infinite;
}

.visual-card:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.visual-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--r-lg);
    background: linear-gradient(135deg, rgba(254, 44, 85, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.visual-card-head {
    display: flex;
    align-items: center;
    gap: var(--gap-2);
    padding-bottom: var(--gap-4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    margin-bottom: var(--gap-4);
}

.visual-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
}

.visual-dot:first-child {
    background: var(--c-primary);
}

.visual-tag {
    margin-left: auto;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.04em;
}

.visual-body {
    display: flex;
    flex-direction: column;
    gap: var(--gap-4);
}

.visual-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
}

.visual-key {
    color: rgba(255, 255, 255, 0.5);
}

.visual-val {
    color: #fff;
    font-weight: 500;
}

.visual-val.highlight {
    color: var(--c-primary-3);
}

.visual-bars {
    display: flex;
    align-items: flex-end;
    gap: var(--gap-3);
    height: 120px;
    padding: var(--gap-3) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    justify-content: flex-end;
    gap: var(--gap-2);
}

.bar-item span {
    display: block;
    width: 100%;
    height: var(--h);
    background: linear-gradient(180deg, rgba(254, 44, 85, 0.6) 0%, rgba(254, 44, 85, 0.2) 100%);
    border-radius: 4px 4px 0 0;
    position: relative;
    overflow: hidden;
    transition: all 0.6s var(--ease);
}

.bar-item span::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.2) 100%);
}

.bar-item.active span {
    background: linear-gradient(180deg, var(--c-primary) 0%, var(--c-primary-3) 100%);
    box-shadow: 0 0 20px rgba(254, 44, 85, 0.4);
}

.bar-item em {
    font-style: normal;
    font-size: 10px;
    color: rgba(255, 255, 255, 0.5);
}

.bar-item.active em {
    color: var(--c-primary-3);
}

.visual-footer {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-4);
}

.visual-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.visual-stat .num {
    font-family: var(--font-en);
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
    letter-spacing: -0.02em;
}

.visual-stat em {
    font-style: normal;
    font-size: 14px;
    color: var(--c-primary-3);
    font-weight: 600;
}

.visual-stat .lbl {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 2px;
}

/* 滚动指示 */
.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--gap-2);
    z-index: 5;
}

.scroll-text {
    font-family: var(--font-en);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 500;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.4) 0%, transparent 100%);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--c-primary);
    animation: scrollLine 2s ease-in-out infinite;
}

/* ==========================================================================
   通用板块样式
   ========================================================================== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-head {
    text-align: center;
    max-width: 760px;
    margin: 0 auto var(--gap-9);
}

.section-head.light {
    color: #fff;
}

.section-eyebrow {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 12px;
    font-weight: 600;
    color: var(--c-primary);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: var(--gap-3);
    position: relative;
    padding: 0 24px;
}

.section-eyebrow::before,
.section-eyebrow::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 16px;
    height: 1px;
    background: var(--c-primary);
}

.section-eyebrow::before {
    left: 0;
}

.section-eyebrow::after {
    right: 0;
}

.section-head.light .section-eyebrow {
    color: var(--c-primary-3);
}

.section-head.light .section-eyebrow::before,
.section-head.light .section-eyebrow::after {
    background: var(--c-primary-3);
}

.section-title {
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin-bottom: var(--gap-4);
    color: var(--c-text);
}

.section-head.light .section-title {
    color: #fff;
}

.section-desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--c-text-3);
}

.section-head.light .section-desc {
    color: rgba(255, 255, 255, 0.65);
}

/* ==========================================================================
   核心业务
   ========================================================================== */
.section-services {
    background: var(--c-surface-2);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-5);
}

.service-card {
    position: relative;
    background: #fff;
    border-radius: var(--r-lg);
    padding: 40px 32px;
    border: 1px solid var(--c-line);
    transition: all 0.5s var(--ease);
    overflow: hidden;
    isolation: isolate;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--g-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s var(--ease);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-num {
    font-family: var(--font-en);
    font-size: 64px;
    font-weight: 800;
    line-height: 1;
    color: var(--c-surface-3);
    margin-bottom: var(--gap-3);
    letter-spacing: -0.04em;
    transition: color 0.5s var(--ease);
}

.service-card:hover .service-num {
    color: var(--c-primary-3);
}

.service-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--r-md);
    background: linear-gradient(135deg, rgba(254, 44, 85, 0.08) 0%, rgba(255, 74, 110, 0.08) 100%);
    color: var(--c-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--gap-4);
    transition: all 0.5s var(--ease);
}

.service-card:hover .service-icon {
    background: var(--g-primary);
    color: #fff;
    transform: rotate(-5deg) scale(1.05);
}

.service-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: var(--gap-3);
    color: var(--c-text);
    letter-spacing: 0.01em;
}

.service-desc {
    font-size: 14px;
    line-height: 1.75;
    color: var(--c-text-3);
    margin-bottom: var(--gap-5);
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: var(--gap-3);
    padding-top: var(--gap-4);
    border-top: 1px dashed var(--c-line);
}

.service-list li {
    position: relative;
    padding-left: 22px;
    font-size: 13px;
    color: var(--c-text-2);
    line-height: 1.6;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 12px;
    height: 1px;
    background: var(--c-primary);
}

/* ==========================================================================
   扩展业务
   ========================================================================== */
.section-extras {
    background: #fff;
}

.extras-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-4);
}

.extra-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--gap-4);
    padding: 24px;
    background: var(--c-surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-md);
    transition: all 0.4s var(--ease);
    overflow: hidden;
    isolation: isolate;
}

.extra-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--g-primary);
    opacity: 0;
    transition: opacity 0.4s var(--ease);
    z-index: -1;
}

.extra-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
    transition: left 0.6s var(--ease);
}

.extra-card:hover {
    background: var(--g-primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-pink);
}

.extra-card:hover::after {
    left: 100%;
}

.extra-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--r-sm);
    background: #fff;
    color: var(--c-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.4s var(--ease);
    box-shadow: 0 2px 8px rgba(11, 14, 20, 0.04);
}

.extra-card:hover .extra-icon {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.extra-card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--c-text);
    transition: color 0.4s var(--ease);
}

.extra-card:hover h3 {
    color: #fff;
}

.extra-card p {
    font-size: 12px;
    color: var(--c-text-3);
    transition: color 0.4s var(--ease);
}

.extra-card:hover p {
    color: rgba(255, 255, 255, 0.85);
}

/* ==========================================================================
   15年+优势
   ========================================================================== */
.section-expertise {
    background: var(--g-dark);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.section-expertise::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(254, 44, 85, 0.18) 0%, transparent 70%);
    filter: blur(80px);
    pointer-events: none;
}

.section-expertise::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 213, 128, 0.10) 0%, transparent 70%);
    filter: blur(80px);
    pointer-events: none;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-4);
    margin-bottom: var(--gap-7);
    position: relative;
    z-index: 2;
}

.expertise-card {
    position: relative;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--r-lg);
    text-align: center;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all 0.5s var(--ease);
    overflow: hidden;
}

.expertise-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(254, 44, 85, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.4s var(--ease);
}

.expertise-card:hover {
    transform: translateY(-6px);
    border-color: rgba(254, 44, 85, 0.3);
}

.expertise-card:hover::before {
    opacity: 1;
}

.expertise-num {
    font-family: var(--font-en);
    font-size: 48px;
    font-weight: 800;
    line-height: 1;
    color: #fff;
    margin-bottom: var(--gap-3);
    letter-spacing: -0.04em;
    display: inline-flex;
    align-items: baseline;
    position: relative;
    z-index: 1;
}

.expertise-num em {
    font-style: normal;
    font-size: 20px;
    color: var(--c-primary-3);
    margin-left: 4px;
    font-weight: 600;
}

.expertise-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: var(--gap-2);
    position: relative;
    z-index: 1;
}

.expertise-card p {
    font-size: 13px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.6);
    position: relative;
    z-index: 1;
}

.trust-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-5);
    padding: 32px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--r-lg);
    position: relative;
    z-index: 2;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--gap-4);
}

.trust-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--r-sm);
    background: var(--g-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.trust-item h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
    color: #fff;
}

.trust-item p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

/* ==========================================================================
   服务流程
   ========================================================================== */
.section-process {
    background: var(--c-surface-2);
}

.process-list {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--gap-3);
    position: relative;
}

.process-list::before {
    content: '';
    position: absolute;
    top: 32px;
    left: 8%;
    right: 8%;
    height: 1px;
    background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-primary-3) 50%, var(--c-primary) 100%);
    z-index: 0;
}

.process-step {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 8px;
}

.step-num {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--gap-4);
    border-radius: 50%;
    background: #fff;
    border: 2px solid var(--c-primary);
    color: var(--c-primary);
    font-family: var(--font-en);
    font-size: 20px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s var(--ease);
    position: relative;
    box-shadow: 0 0 0 8px var(--c-surface-2);
}

.process-step:hover .step-num {
    background: var(--g-primary);
    color: #fff;
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 8px 24px rgba(254, 44, 85, 0.3), 0 0 0 8px var(--c-surface-2);
}

.process-step h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: var(--gap-2);
    color: var(--c-text);
}

.process-step p {
    font-size: 12px;
    line-height: 1.6;
    color: var(--c-text-3);
}

/* ==========================================================================
   合作案例
   ========================================================================== */
.section-cases {
    background: #fff;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-5);
}

.case-card {
    position: relative;
    padding: 32px;
    background: var(--c-surface-2);
    border: 1px solid var(--c-line);
    border-radius: var(--r-lg);
    transition: all 0.5s var(--ease);
    overflow: hidden;
    isolation: isolate;
}

.case-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(254, 44, 85, 0.06) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.5s var(--ease);
    z-index: -1;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.case-card:hover::before {
    opacity: 1;
}

.case-tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--r-full);
    background: rgba(254, 44, 85, 0.08);
    color: var(--c-primary);
    font-size: 11px;
    font-weight: 600;
    margin-bottom: var(--gap-4);
    letter-spacing: 0.04em;
}

.case-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: var(--gap-3);
    color: var(--c-text);
    line-height: 1.4;
}

.case-card p {
    font-size: 13px;
    line-height: 1.7;
    color: var(--c-text-3);
    margin-bottom: var(--gap-4);
}

.case-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-3);
    padding-top: var(--gap-4);
    border-top: 1px dashed var(--c-line);
}

.case-metrics li {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.case-metrics strong {
    font-size: 11px;
    font-weight: 500;
    color: var(--c-text-3);
    letter-spacing: 0.02em;
}

.case-metrics span {
    font-family: var(--font-en);
    font-size: 20px;
    font-weight: 800;
    color: var(--c-primary);
    letter-spacing: -0.02em;
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.section-faq {
    background: var(--c-surface-2);
}

.faq-list {
    max-width: 920px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--gap-3);
}

.faq-item {
    background: #fff;
    border: 1px solid var(--c-line);
    border-radius: var(--r-md);
    overflow: hidden;
    transition: all 0.4s var(--ease);
}

.faq-item[open] {
    border-color: var(--c-primary-3);
    box-shadow: var(--shadow-md);
}

.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 22px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-3);
    font-weight: 600;
    color: var(--c-text);
    transition: all 0.3s var(--ease);
    user-select: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary:hover {
    color: var(--c-primary);
}

.faq-q {
    font-size: 16px;
    flex: 1;
    line-height: 1.5;
}

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    background: var(--c-primary);
    transition: all 0.3s var(--ease);
}

.faq-icon::before {
    width: 14px;
    height: 2px;
    transform: translate(-50%, -50%);
}

.faq-icon::after {
    width: 2px;
    height: 14px;
    transform: translate(-50%, -50%);
}

.faq-item[open] .faq-icon::after {
    transform: translate(-50%, -50%) scaleY(0);
}

.faq-a {
    padding: 0 28px 24px;
    color: var(--c-text-2);
    line-height: 1.8;
    font-size: 14px;
    animation: faqFade 0.4s var(--ease);
}

.faq-a p {
    border-top: 1px dashed var(--c-line);
    padding-top: var(--gap-4);
}

/* ==========================================================================
   联系方式
   ========================================================================== */
.section-contact {
    background: var(--g-dark);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.section-contact::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(254, 44, 85, 0.15) 0%, transparent 70%);
    filter: blur(80px);
    pointer-events: none;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-4);
    margin-bottom: var(--gap-5);
    position: relative;
    z-index: 2;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--r-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all 0.4s var(--ease);
    cursor: pointer;
    color: #fff;
}

.contact-card:hover {
    background: rgba(254, 44, 85, 0.08);
    border-color: rgba(254, 44, 85, 0.32);
    transform: translateY(-4px);
}

.qr-card {
    cursor: default;
}

.qr-card:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.16);
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(254, 44, 85, 0.12);
    color: var(--c-primary-3);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--gap-4);
    transition: all 0.4s var(--ease);
}

.contact-card:hover .contact-icon {
    background: var(--g-primary);
    color: #fff;
    transform: scale(1.1);
}

.contact-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: var(--gap-2);
    letter-spacing: 0.04em;
}

.contact-value {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    word-break: break-all;
}

.qr-card {
    flex-direction: row;
    justify-content: center;
    gap: var(--gap-4);
    padding: 20px;
}

.qr-img {
    width: 88px;
    height: 88px;
    border-radius: var(--r-sm);
    overflow: hidden;
    background: #fff;
    flex-shrink: 0;
    padding: 4px;
}

.qr-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qr-text {
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--gap-2);
}

.contact-extra {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-4);
    position: relative;
    z-index: 2;
}

.extra-block {
    display: flex;
    align-items: center;
    gap: var(--gap-4);
    padding: 20px 24px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--r-md);
    transition: all 0.4s var(--ease);
    color: #fff;
}

.extra-block:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.16);
}

.extra-block .extra-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--r-sm);
    background: rgba(254, 44, 85, 0.12);
    color: var(--c-primary-3);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.extra-block h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 2px;
}

.extra-block p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
}

/* ==========================================================================
   底部
   ========================================================================== */
.footer {
    background: #06080D;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--gap-5);
    padding-bottom: var(--gap-7);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    margin-bottom: var(--gap-5);
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--gap-3);
    letter-spacing: 0.02em;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col a {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    transition: color 0.3s var(--ease);
    display: inline-block;
}

.footer-col a:hover {
    color: var(--c-primary-3);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--gap-3);
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
}

.copyright p {
    margin-bottom: 4px;
    line-height: 1.7;
}

.copyright a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.3s var(--ease);
}

.copyright a:hover {
    color: var(--c-primary-3);
}

.footer-tagline {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 0.04em;
}

/* 回到顶部 */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--g-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-pink);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
    transition: all 0.4s var(--ease);
}

.back-top.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-top:hover {
    transform: translateY(-4px);
}