/* ========== 基础变量 ========== */
:root {
    --bg: #0a0f1e;
    --bg-alt: #0e1426;
    --surface: #131a30;
    --surface-2: #1a2342;
    --border: rgba(255, 255, 255, 0.08);
    --text: #e8edf7;
    --text-dim: #9aa6c4;
    --text-mute: #6b779a;
    --primary: #3b82f6;
    --primary-2: #06b6d4;
    --accent: #8b5cf6;
    --grad: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
    --grad-2: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
    --maxw: 1180px;
}

/* ========== 重置 ========== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
        sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

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

.section {
    padding: 100px 0;
    position: relative;
}

.section-alt {
    background: var(--bg-alt);
}

.section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.section-kicker {
    display: inline-block;
    font-size: 13px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary-2);
    font-weight: 600;
    margin-bottom: 14px;
}

.section-title {
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 0.5px;
}

.section-sub {
    margin-top: 16px;
    color: var(--text-dim);
    font-size: 16px;
}

.grid {
    display: grid;
    gap: 24px;
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 30px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
    background: var(--grad);
    color: #fff;
    box-shadow: 0 10px 30px -8px rgba(59, 130, 246, 0.55);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 36px -8px rgba(59, 130, 246, 0.7);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    border-color: var(--primary-2);
    color: var(--primary-2);
    transform: translateY(-2px);
}

/* ========== 顶部导航 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 18px 0;
    transition: all 0.3s ease;
    background: transparent;
}

.header.scrolled {
    background: rgba(10, 15, 30, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--grad);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1px;
    flex-shrink: 0;
}

.logo-text {
    font-size: 17px;
}

.nav {
    display: flex;
    gap: 6px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 15px;
    color: var(--text-dim);
    transition: color 0.2s ease, background 0.2s ease;
}

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

.menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
}

.menu-btn span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background: var(--text);
    transition: all 0.3s ease;
}

/* ========== 首屏 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.18), transparent 45%),
        radial-gradient(circle at 80% 30%, rgba(6, 182, 212, 0.15), transparent 45%),
        radial-gradient(circle at 50% 90%, rgba(139, 92, 246, 0.14), transparent 50%);
    z-index: 0;
}

.hero-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 75%);
    -webkit-mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 75%);
}

.hero-inner {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-tag {
    display: inline-block;
    padding: 7px 18px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 13px;
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.03);
    margin-bottom: 28px;
}

.hero-title {
    font-size: clamp(34px, 6vw, 60px);
    font-weight: 800;
    line-height: 1.18;
    letter-spacing: 0.5px;
    max-width: 900px;
    margin: 0 auto;
}

.grad {
    background: var(--grad-2);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-desc {
    margin: 26px auto 0;
    max-width: 640px;
    color: var(--text-dim);
    font-size: 17px;
}

.hide-mobile {
    display: inline;
}

.hero-actions {
    margin-top: 40px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    margin-top: 70px;
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
    padding: 22px 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.02);
    min-width: 150px;
}

.stat strong {
    display: block;
    font-size: 28px;
    font-weight: 800;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.stat span {
    font-size: 13px;
    color: var(--text-mute);
}

/* ========== 业务卡片 ========== */
.service-card {
    transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.service-card:hover {
    transform: translateY(-6px);
    border-color: rgba(59, 130, 246, 0.4);
    background: rgba(59, 130, 246, 0.04);
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 34px 30px;
}

.card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    height: 58px;
    border-radius: 14px;
    background: rgba(59, 130, 246, 0.12);
    color: var(--primary-2);
    margin-bottom: 22px;
}

.card-title {
    font-size: 21px;
    font-weight: 700;
    margin-bottom: 12px;
}

.card-text {
    color: var(--text-dim);
    font-size: 15px;
    margin-bottom: 20px;
}

.card-list li {
    position: relative;
    padding: 7px 0 7px 22px;
    color: var(--text-dim);
    font-size: 14px;
}

.card-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--grad);
}

.sub-services {
    margin-top: 24px;
}

.mini {
    padding: 26px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--primary-2);
    border-radius: var(--radius-sm);
}

.mini h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.mini p {
    font-size: 14px;
    color: var(--text-dim);
}

/* ========== 关于我们 ========== */
.about-wrap {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}

.about-text .section-title,
.about-text .section-kicker {
    text-align: left;
}

.about-text p {
    color: var(--text-dim);
    margin-top: 18px;
    font-size: 16px;
}

.about-points {
    margin-top: 36px;
    display: grid;
    gap: 20px;
}

.point {
    display: flex;
    gap: 18px;
    align-items: flex-start;
}

.point-num {
    font-size: 18px;
    font-weight: 800;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    flex-shrink: 0;
}

.point h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.point p {
    font-size: 14px;
    color: var(--text-mute);
    margin: 0;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.visual-card {
    width: 100%;
    max-width: 360px;
    padding: 38px 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    position: relative;
    box-shadow: var(--shadow);
}

.visual-line {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    font-size: 16px;
    font-weight: 500;
}

.visual-line:last-of-type {
    border-bottom: none;
}

.visual-line span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--grad);
    flex-shrink: 0;
}

.visual-badge {
    margin-top: 26px;
    text-align: center;
    padding: 14px;
    border-radius: var(--radius-sm);
    background: var(--grad);
    color: #fff;
    font-weight: 700;
    letter-spacing: 1px;
}

/* ========== 联系我们 ========== */
.contact-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    max-width: 760px;
    margin: 0 auto;
    padding: 44px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    flex-wrap: wrap;
}

.contact-item {
    flex: 1;
    min-width: 240px;
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: center;
    padding: 16px 24px;
}

.contact-item--email {
    max-width: 340px;
}

.contact-item--wechat {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 18px;
    max-width: 240px;
}

.contact-item--wechat .contact-info {
    align-items: center;
    text-align: center;
}

.contact-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border-radius: 14px;
    background: rgba(59, 130, 246, 0.12);
    color: var(--primary-2);
    flex-shrink: 0;
}

.qr-img {
    width: 180px;
    height: 180px;
    border-radius: 16px;
    overflow: hidden;
    flex-shrink: 0;
    background: #fff;
    padding: 10px;
    box-shadow: 0 8px 24px -8px rgba(0, 0, 0, 0.4);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.contact-label {
    font-size: 13px;
    color: var(--text-mute);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.contact-value {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    word-break: break-all;
}

a.contact-value:hover {
    color: var(--primary-2);
}

.contact-note {
    font-size: 13px;
    color: var(--text-mute);
    margin-top: 6px;
}

.contact-divider {
    width: 1px;
    align-self: stretch;
    background: var(--border);
    margin: 12px 0;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 56px 0 28px;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    flex-wrap: wrap;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--border);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.footer-brand strong {
    display: block;
    font-size: 16px;
}

.footer-brand p {
    font-size: 13px;
    color: var(--text-mute);
}

.footer-nav {
    display: flex;
    gap: 26px;
}

.footer-nav a {
    font-size: 14px;
    color: var(--text-dim);
    transition: color 0.2s ease;
}

.footer-nav a:hover {
    color: var(--primary-2);
}

.footer-bottom {
    padding-top: 26px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-dim);
    text-align: center;
}

.footer-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-bottom a {
    text-decoration: underline;
    text-decoration-color: rgba(154, 166, 196, 0.45);
    text-underline-offset: 3px;
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.footer-bottom a:hover {
    color: var(--primary-2);
    text-decoration-color: currentColor;
}

.footer-bottom a:focus-visible {
    outline: 2px solid var(--primary-2);
    outline-offset: 4px;
    border-radius: 2px;
}

.sep {
    margin: 0 8px;
    color: var(--border);
}

/* ========== 滚动出现动画 ========== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in {
    opacity: 1;
    transform: none;
}

/* ========== 响应式 ========== */
@media (max-width: 960px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-wrap {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-text .section-title,
    .about-text .section-kicker {
        text-align: center;
    }
}

@media (max-width: 720px) {
    .section {
        padding: 70px 0;
    }

    .nav {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: min(78vw, 320px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 10px;
        background: var(--bg-alt);
        border-left: 1px solid var(--border);
        transform: translateX(100%);
        transition: transform 0.3s ease;
        padding: 40px;
    }

    .nav.open {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 18px;
        padding: 12px 28px;
    }

    .menu-btn {
        display: flex;
        position: relative;
        z-index: 110;
    }

    .menu-btn.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-btn.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .logo-text {
        font-size: 15px;
    }

    .hide-mobile {
        display: none;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 320px;
    }

    .stat {
        min-width: 100px;
        padding: 18px 22px;
    }

    .stat strong {
        font-size: 22px;
    }
}

@media (max-width: 540px) {
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .contact-cta {
        flex-direction: column;
        gap: 8px;
        padding: 30px 20px;
    }

    .contact-divider {
        display: none;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-nav {
        flex-wrap: wrap;
    }

    .footer-bottom {
        align-items: center;
    }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
    * {
        scroll-behavior: auto !important;
        animation: none !important;
        transition: none !important;
    }
}