/* ============================================
   星领科技 - 官方网站样式表
   ============================================ */

/* ---------- CSS变量 ---------- */
:root {
    --color-bg: #f0f4f8;
    --color-bg-alt: #ffffff;
    --color-bg-card: #ffffff;
    --color-bg-card-hover: #f8fafc;
    --color-primary: #00b4d8;
    --color-primary-dark: #0099cc;
    --color-secondary: #0066ff;
    --color-accent: #00e5ff;
    --color-glow: rgba(0, 180, 216, 0.12);
    --color-text: #0f172a;
    --color-text-muted: #475569;
    --color-text-dim: #94a3b8;
    --color-border: rgba(0, 0, 0, 0.06);
    --color-border-hover: rgba(0, 180, 216, 0.35);
    --gradient-primary: linear-gradient(135deg, #00b4d8 0%, #0066ff 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 180, 216, 0.1) 0%, rgba(0, 102, 255, 0.04) 100%);
    --font-sans: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Inter', 'Noto Sans SC', sans-serif;
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 30px rgba(0, 180, 216, 0.08);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--color-primary-dark);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* ---------- 选择文本 ---------- */
::selection {
    background: rgba(0, 180, 216, 0.25);
    color: #0f172a;
}

/* ============================================
   导航栏
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    transition: var(--transition);
}

.header--scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 10px rgba(0, 0, 0, 0.04);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo__img {
    height: 86px;
    width: auto;
    display: block;
}

.logo__icon {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 8px;
    font-size: 18px;
    color: #fff;
    box-shadow: 0 0 20px rgba(0, 180, 216, 0.25);
}

.logo__text {
    font-size: 22px;
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: 1px;
}

.logo__accent {
    color: var(--color-primary);
}

/* 导航菜单 */
.nav__list {
    display: flex;
    gap: 32px;
}

.nav__link {
    font-size: 15px;
    color: var(--color-text-muted);
    position: relative;
    padding: 4px 0;
    transition: var(--transition);
    font-weight: 400;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-text);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger__line {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active .hamburger__line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger__line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger__line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero主视觉
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero__canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.6;
}

/* 动画渐变背景 */
.hero__gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 30%, rgba(0, 180, 216, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 20%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 70% 70% at 60% 80%, rgba(0, 229, 255, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse 50% 60% at 10% 70%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
        var(--color-bg);
    animation: gradientShift 12s ease-in-out infinite alternate;
}

@keyframes gradientShift {
    0% {
        background:
            radial-gradient(ellipse 80% 60% at 20% 30%, rgba(0, 180, 216, 0.12) 0%, transparent 60%),
            radial-gradient(ellipse 60% 50% at 80% 20%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
            radial-gradient(ellipse 70% 70% at 60% 80%, rgba(0, 229, 255, 0.06) 0%, transparent 55%),
            radial-gradient(ellipse 50% 60% at 10% 70%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
            var(--color-bg);
    }
    50% {
        background:
            radial-gradient(ellipse 70% 50% at 30% 40%, rgba(0, 102, 255, 0.1) 0%, transparent 55%),
            radial-gradient(ellipse 65% 55% at 70% 70%, rgba(0, 180, 216, 0.1) 0%, transparent 50%),
            radial-gradient(ellipse 75% 65% at 40% 20%, rgba(0, 229, 255, 0.07) 0%, transparent 50%),
            radial-gradient(ellipse 55% 50% at 85% 50%, rgba(99, 102, 241, 0.06) 0%, transparent 45%),
            var(--color-bg);
    }
    100% {
        background:
            radial-gradient(ellipse 65% 55% at 70% 30%, rgba(0, 229, 255, 0.1) 0%, transparent 50%),
            radial-gradient(ellipse 70% 60% at 30% 70%, rgba(0, 180, 216, 0.09) 0%, transparent 55%),
            radial-gradient(ellipse 60% 50% at 15% 50%, rgba(0, 102, 255, 0.08) 0%, transparent 45%),
            radial-gradient(ellipse 55% 55% at 55% 85%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
            var(--color-bg);
    }
}

/* 网格点阵 */
.hero__grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background-image:
        radial-gradient(circle, rgba(0, 180, 216, 0.15) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.5;
}

/* 浮动几何形状 */
.hero__shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.hero__shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0;
    animation: shapeFloat 15s ease-in-out infinite;
}

.hero__shape--1 {
    width: 300px;
    height: 300px;
    top: -60px;
    right: 10%;
    border: 1px solid rgba(0, 180, 216, 0.12);
    animation-delay: 0s;
    animation-duration: 18s;
}

.hero__shape--2 {
    width: 200px;
    height: 200px;
    bottom: 15%;
    left: 5%;
    border: 2px solid rgba(0, 102, 255, 0.08);
    border-radius: 30% 70% 50% 50% / 50% 40% 60% 50%;
    animation-delay: -3s;
    animation-duration: 20s;
}

.hero__shape--3 {
    width: 150px;
    height: 150px;
    top: 30%;
    left: 18%;
    border: 1.5px solid rgba(0, 229, 255, 0.1);
    animation-delay: -6s;
    animation-duration: 16s;
    border-radius: 40% 60% 65% 35% / 40% 45% 55% 60%;
}

.hero__shape--4 {
    width: 120px;
    height: 120px;
    bottom: 30%;
    right: 15%;
    border: 1px solid rgba(99, 102, 241, 0.12);
    animation-delay: -9s;
    animation-duration: 22s;
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
}

@keyframes shapeFloat {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.8) rotate(0deg);
    }
    10% {
        opacity: 1;
    }
    45% {
        transform: translateY(-30px) scale(1.1) rotate(180deg);
    }
    55% {
        transform: translateY(-30px) scale(1.1) rotate(180deg);
    }
    90% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateY(20px) scale(0.8) rotate(360deg);
    }
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, var(--color-bg) 100%);
    z-index: 2;
    pointer-events: none;
}

.hero__content {
    position: relative;
    z-index: 3;
    text-align: center;
    max-width: 820px;
}

.hero__badge {
    display: inline-block;
    padding: 8px 20px;
    border: 1px solid rgba(0, 180, 216, 0.3);
    border-radius: 50px;
    font-size: 14px;
    color: var(--color-primary);
    background: rgba(0, 180, 216, 0.06);
    margin-bottom: 28px;
    letter-spacing: 2px;
    font-weight: 500;
}

.hero__title {
    font-size: clamp(38px, 6vw, 68px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    font-family: var(--font-display);
    letter-spacing: -1px;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__desc {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--color-text-muted);
    max-width: 580px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

.btn--primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 180, 216, 0.3);
}

.btn--primary:hover {
    box-shadow: 0 8px 30px rgba(0, 180, 216, 0.4);
    transform: translateY(-2px);
}

.btn--outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid rgba(0, 0, 0, 0.12);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    background: rgba(0, 180, 216, 0.04);
    transform: translateY(-2px);
}

.btn--full {
    width: 100%;
    justify-content: center;
}

/* 滚动指示 */
.hero__scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: fadeInUp 1s ease 1s both;
}

.hero__scroll-text {
    font-size: 12px;
    color: var(--color-text-dim);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.5); }
}

/* ============================================
   通用Section
   ============================================ */
.section {
    padding: 100px 0;
    position: relative;
}

.section__header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section__tag {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid rgba(0, 180, 216, 0.2);
    border-radius: 50px;
    font-size: 13px;
    color: var(--color-primary);
    background: rgba(0, 180, 216, 0.05);
    margin-bottom: 16px;
    font-weight: 500;
    letter-spacing: 1px;
}

.section__title {
    font-size: clamp(28px, 3.5vw, 40px);
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section__title--left {
    text-align: left;
}

.section__desc {
    color: var(--color-text-muted);
    font-size: 17px;
    line-height: 1.7;
}

/* ============================================
   产品特点
   ============================================ */
.features {
    background: var(--color-bg-alt);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.feature-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
}

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

.feature-card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-glow);
    border: 1px solid rgba(0, 180, 216, 0.1);
    border-radius: var(--radius);
    font-size: 22px;
    color: var(--color-primary);
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-card__icon {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 0 20px rgba(0, 180, 216, 0.3);
}

.feature-card__title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card__desc {
    color: var(--color-text-muted);
    font-size: 15px;
    line-height: 1.7;
}

/* ============================================
   技术优势
   ============================================ */
.advantages__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.advantage-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.advantage-card__icon-wrap {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-glow);
    border: 1px solid rgba(0, 180, 216, 0.1);
    border-radius: 50%;
    margin: 0 auto 20px;
    font-size: 28px;
    color: var(--color-primary);
    transition: var(--transition);
}

.advantage-card:hover .advantage-card__icon-wrap {
    border-color: var(--color-primary);
    box-shadow: 0 0 30px rgba(0, 180, 216, 0.12);
}

.advantage-card__title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.advantage-card__desc {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.7;
}

/* ============================================
   数据统计
   ============================================ */
.stats {
    background: var(--color-bg-alt);
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(0, 180, 216, 0.04) 0%, transparent 50%);
    animation: pulseBg 8s ease-in-out infinite;
}

@keyframes pulseBg {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.stats__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
    z-index: 1;
}

.stat-item {
    text-align: center;
    padding: 40px 20px;
}

.stat-item__icon {
    font-size: 28px;
    color: var(--color-primary);
    margin-bottom: 16px;
    opacity: 0.7;
}

.stat-item__number {
    font-size: clamp(42px, 5vw, 56px);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-display);
    line-height: 1.1;
    margin-bottom: 8px;
}

.stat-item__label {
    font-size: 16px;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ============================================
   合作伙伴
   ============================================ */
.partners__slider {
    overflow: hidden;
    position: relative;
}

.partners__slider::before,
.partners__slider::after {
    content: '';
    position: absolute;
    top: 0;
    width: 100px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.partners__slider::before {
    left: 0;
    background: linear-gradient(to right, var(--color-bg), transparent);
}

.partners__slider::after {
    right: 0;
    background: linear-gradient(to left, var(--color-bg), transparent);
}

.partners__track {
    display: flex;
    gap: 48px;
    animation: scrollPartners 30s linear infinite;
    width: max-content;
}

@keyframes scrollPartners {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.partners__track:hover {
    animation-play-state: paused;
}

.partner-logo {
    flex-shrink: 0;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 32px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg-card);
    min-width: 160px;
    transition: var(--transition);
}

.partner-logo span {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    white-space: nowrap;
}

.partner-logo:hover {
    border-color: var(--color-border-hover);
    background: var(--color-bg-card-hover);
}

.partner-logo:hover span {
    color: var(--color-primary);
}

/* ============================================
   关于我们
   ============================================ */
.about {
    background: var(--color-bg-alt);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about__text {
    color: var(--color-text-muted);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.about__features {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.about__feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--color-text);
}

.about__feature-item i {
    color: var(--color-primary);
    font-size: 18px;
}

/* 代码块 */
.about__code-block {
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    font-family: 'Fira Code', 'Cascadia Code', monospace;
    font-size: 14px;
    line-height: 1.8;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.about__code-block::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    opacity: 0.06;
    z-index: -1;
}

.about__code-dots {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.about__code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.about__code-dots span:nth-child(1) { background: #ff5f56; }
.about__code-dots span:nth-child(2) { background: #ffbd2e; }
.about__code-dots span:nth-child(3) { background: #27c93f; }

.about__code-content {
    color: var(--color-text-muted);
}

.code-keyword { color: #7c3aed; }
.code-class { color: #f59e0b; }
.code-string { color: #10b981; }
.code-function { color: #3b82f6; }

/* ============================================
   联系我们
   ============================================ */
.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact__card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.contact__card:hover {
    border-color: var(--color-border-hover);
    background: var(--color-bg-card-hover);
}

.contact__card-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-glow);
    border-radius: var(--radius);
    font-size: 18px;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.contact__card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact__card a,
.contact__card p {
    color: var(--color-text-muted);
    font-size: 14px;
    transition: var(--transition);
}

.contact__card a:hover {
    color: var(--color-primary);
}

/* 表单 */
.contact__form {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form__group {
    margin-bottom: 16px;
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 14px 18px;
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 15px;
    font-family: var(--font-sans);
    transition: var(--transition);
    outline: none;
}

.form__input:focus,
.form__textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.08);
    background: #ffffff;
}

.form__input::placeholder,
.form__textarea::placeholder {
    color: var(--color-text-dim);
}

.form__textarea {
    height: 120px;
    resize: vertical;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: #f8fafc;
    border-top: 1px solid var(--color-border);
    padding: 60px 0 0;
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
}

.footer__desc {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.7;
    margin: 16px 0 20px;
    max-width: 320px;
}

.footer__social {
    display: flex;
    gap: 12px;
}

.footer__social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-text-muted);
    font-size: 16px;
    transition: var(--transition);
}

.footer__social-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(0, 180, 216, 0.04);
}

.footer__links h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer__links ul li {
    margin-bottom: 10px;
}

.footer__links ul li a {
    color: var(--color-text-muted);
    font-size: 14px;
    transition: var(--transition);
}

.footer__links ul li a:hover {
    color: var(--color-primary);
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    padding: 20px 0;
    text-align: center;
}

.footer__bottom p {
    color: var(--color-text-dim);
    font-size: 13px;
}

/* ============================================
   动效 - reveal动画
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   响应式 - 平板
   ============================================ */
@media (max-width: 1024px) {
    .features__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about__grid {
        gap: 40px;
    }
}

@media (max-width: 900px) {
    .about__grid {
        grid-template-columns: 1fr;
    }

    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

/* ============================================
   响应式 - 手机
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .section {
        padding: 72px 0;
    }

    .section__header {
        margin-bottom: 40px;
    }

    /* 导航 */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 80px 32px 32px;
        transition: var(--transition);
        border-left: 1px solid var(--color-border);
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.04);
    }

    .nav--open {
        right: 0;
    }

    .nav__list {
        flex-direction: column;
        gap: 24px;
    }

    .nav__link {
        font-size: 18px;
    }

    .hamburger {
        display: flex;
    }

    /* Hero */
    .hero__title {
        font-size: 32px;
    }

    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
        max-width: 280px;
    }

    .hero__scroll {
        display: none;
    }

    .hero__shape--1,
    .hero__shape--2 {
        display: none;
    }

    /* 产品特点 */
    .features__grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        padding: 28px 24px;
    }

    /* 技术优势 */
    .advantages__grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .advantage-card {
        padding: 28px 20px;
    }

    /* 数据统计 */
    .stats__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .stat-item {
        padding: 24px 16px;
    }

    /* 合作伙伴 */
    .partners__track {
        gap: 24px;
    }

    .partner-logo {
        min-width: 120px;
        height: 60px;
        padding: 0 20px;
    }

    .partner-logo span {
        font-size: 14px;
    }

    /* 联系我们 */
    .contact__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .form__row {
        grid-template-columns: 1fr;
    }

    .contact__form {
        padding: 24px;
    }

    /* 页脚 */
    .footer__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer__brand {
        grid-column: 1;
    }
}

@media (max-width: 480px) {
    .stats__grid {
        gap: 16px;
    }

    .stat-item__number {
        font-size: 36px;
    }
}