/* ===== 基础变量与重置 ===== */
:root {
    --bg: #0a0e1a;
    --bg-soft: #111729;
    --bg-card: rgba(22, 30, 50, 0.6);
    --bg-card-hover: rgba(30, 40, 65, 0.85);
    --border: rgba(120, 150, 220, 0.18);
    --border-strong: rgba(140, 170, 240, 0.35);
    --text: #e8eefc;
    --text-soft: #a8b4cf;
    --text-dim: #6b7a9a;
    --accent: #6366f1;
    --accent-2: #8b5cf6;
    --accent-3: #06b6d4;
    --accent-glow: rgba(99, 102, 241, 0.45);
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-text: linear-gradient(90deg, #8b5cf6, #06b6d4);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --radius: 16px;
    --radius-sm: 10px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* 全局背景光晕 */
body::before {
    content: '';
    position: fixed;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15), transparent 70%);
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -200px;
    left: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.12), transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* 粒子画布 */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}

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

/* ===== 通用容器 ===== */
.section {
    position: relative;
    z-index: 1;
    padding: 100px 24px;
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--accent-3);
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 50px;
    background: rgba(6, 182, 212, 0.08);
    margin-bottom: 18px;
}

.section-title {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.5px;
}

.section-subtitle {
    margin-top: 14px;
    color: var(--text-soft);
    font-size: 16px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn .arrow {
    font-style: normal;
    transition: transform 0.3s;
}

.btn:hover .arrow {
    transform: translateX(4px);
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 10px 30px var(--accent-glow);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px var(--accent-glow);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    border: 1px solid var(--border-strong);
    backdrop-filter: blur(10px);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    color: var(--text);
}

.btn-small {
    padding: 10px 22px;
    font-size: 13px;
    background: rgba(99, 102, 241, 0.15);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.4);
}

.btn-small:hover {
    background: var(--gradient);
    color: #fff;
    border-color: transparent;
}

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 18px 0;
    transition: all 0.3s ease;
    background: rgba(10, 14, 26, 0.7);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    padding: 12px 0;
    background: rgba(10, 14, 26, 0.92);
    border-bottom-color: var(--border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
}

.logo-icon {
    color: var(--accent-2);
    font-size: 24px;
    text-shadow: 0 0 15px var(--accent-glow);
}

.logo-text {
    color: var(--text);
    letter-spacing: 1px;
}

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

.nav-menu {
    display: flex;
    gap: 4px;
    margin-left: auto;
    margin-right: 24px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-soft);
    border-radius: 50px;
    transition: all 0.25s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text);
    background: rgba(99, 102, 241, 0.15);
}

.nav-cta {
    padding: 10px 22px;
    background: var(--gradient);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    border-radius: 50px;
    box-shadow: 0 6px 20px var(--accent-glow);
    transition: all 0.3s;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px var(--accent-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}

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

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

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

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 140px 24px 80px;
    text-align: center;
    z-index: 1;
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.06) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    z-index: -1;
}

.hero-content {
    max-width: 880px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 50px;
    font-size: 13px;
    color: #c4b5fd;
    margin-bottom: 30px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-3);
    box-shadow: 0 0 10px var(--accent-3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(36px, 6vw, 68px);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -2px;
    margin-bottom: 24px;
}

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

.hero-desc {
    font-size: 17px;
    color: var(--text-soft);
    max-width: 680px;
    margin: 0 auto 38px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    padding: 28px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    max-width: 800px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
}

.stat-num {
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.stat-label {
    margin-top: 6px;
    font-size: 13px;
    color: var(--text-soft);
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--border);
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-dim);
    font-size: 12px;
    letter-spacing: 2px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-dim), transparent);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--accent-3);
    animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(200%); }
}

/* ===== 服务卡片 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.service-card {
    padding: 32px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s;
}

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

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

.service-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 14px;
    color: #a5b4fc;
    margin-bottom: 22px;
    transition: all 0.3s;
}

.service-icon svg {
    width: 26px;
    height: 26px;
}

.service-card:hover .service-icon {
    background: var(--gradient);
    color: #fff;
    transform: rotate(8deg);
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-soft);
    font-size: 14px;
    margin-bottom: 18px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.service-tags li {
    padding: 4px 10px;
    font-size: 12px;
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 50px;
}

/* ===== 优势布局 ===== */
.advantages-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

.adv-main {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.adv-card {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    transition: all 0.3s;
}

.adv-card:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
}

.adv-num {
    font-size: 32px;
    font-weight: 900;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 14px;
}

.adv-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.adv-card p {
    color: var(--text-soft);
    font-size: 14px;
}

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

.adv-side-card {
    padding: 26px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    flex: 1;
}

.adv-side-card.highlight {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.08));
    border-color: rgba(139, 92, 246, 0.4);
}

.adv-side-card h4 {
    font-size: 16px;
    margin-bottom: 14px;
    color: var(--text);
}

.adv-side-card ul {
    list-style: none;
}

.adv-side-card li {
    padding: 8px 0;
    color: var(--text-soft);
    font-size: 14px;
    border-bottom: 1px dashed var(--border);
}

.adv-side-card li:last-child {
    border-bottom: none;
}

.adv-side-card p {
    color: var(--text-soft);
    font-size: 14px;
    margin-bottom: 14px;
}

.link-arrow {
    color: #a5b4fc;
    font-size: 14px;
    font-weight: 600;
}

.link-arrow:hover {
    color: var(--accent-3);
}

/* ===== 案例展示 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    backdrop-filter: blur(20px);
    transition: all 0.35s;
}

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

.case-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.case-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s;
}

.case-card:hover .case-thumb img {
    transform: scale(1.08);
}

.case-overlay {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.case-type,
.case-platform {
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
    backdrop-filter: blur(10px);
}

.case-type {
    background: rgba(99, 102, 241, 0.85);
    color: #fff;
}

.case-platform {
    background: rgba(10, 14, 26, 0.7);
    color: var(--text-soft);
    border: 1px solid var(--border);
    margin-left: auto;
}

.case-info {
    padding: 22px 24px;
}

.case-info h3 {
    font-size: 19px;
    margin-bottom: 8px;
}

.case-info p {
    color: var(--text-soft);
    font-size: 13px;
    margin-bottom: 16px;
    min-height: 38px;
}

/* ===== 开发流程 ===== */
.workflow-track {
    position: relative;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 24px;
}

.workflow-line {
    position: absolute;
    top: 22px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
    opacity: 0.4;
}

.workflow-step {
    position: relative;
    text-align: center;
    padding: 0 12px;
}

.step-num {
    width: 44px;
    height: 44px;
    margin: 0 auto 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    border: 2px solid var(--accent);
    border-radius: 50%;
    font-weight: 800;
    color: var(--accent-3);
    position: relative;
    z-index: 2;
    transition: all 0.3s;
}

.workflow-step:hover .step-num {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
    transform: scale(1.1);
}

.workflow-step h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.workflow-step p {
    font-size: 13px;
    color: var(--text-soft);
}

/* ===== 关于我们 ===== */
.about-wrap {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 48px;
    align-items: center;
}

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

.about-text .section-title {
    margin-bottom: 20px;
}

.about-text p {
    color: var(--text-soft);
    margin-bottom: 16px;
    font-size: 15px;
}

.about-points {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 26px;
}

.point {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text);
}

.point-icon {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient);
    color: #fff;
    border-radius: 50%;
    font-size: 12px;
    flex-shrink: 0;
}

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

.visual-card {
    padding: 28px 20px;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    transition: all 0.3s;
}

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

.visual-num {
    font-size: 42px;
    font-weight: 900;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.visual-num span {
    font-size: 20px;
    margin-left: 2px;
}

.visual-label {
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-soft);
}

/* ===== 联系我们 ===== */
.contact {
    background: linear-gradient(180deg, transparent, rgba(99, 102, 241, 0.04), transparent);
}

.contact-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-left .section-tag,
.contact-left .section-title {
    text-align: left;
}

.contact-left .section-title {
    margin-bottom: 16px;
}

.contact-left .section-subtitle {
    margin: 0 0 32px;
    text-align: left;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 22px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(20px);
    transition: all 0.3s;
}

.contact-item:hover {
    border-color: var(--border-strong);
    transform: translateX(4px);
}

.contact-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 12px;
    color: #a5b4fc;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-label {
    font-size: 12px;
    color: var(--text-dim);
    margin-bottom: 2px;
}

.contact-value {
    font-size: 15px;
    color: var(--text);
    font-weight: 600;
}

.contact-form {
    padding: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
}

.contact-form h3 {
    font-size: 22px;
    margin-bottom: 22px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 12px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 13px 16px;
    background: rgba(10, 14, 26, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--text-dim);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(10, 14, 26, 0.9);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.contact-form select {
    margin-bottom: 12px;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23a8b4cf' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
}

.contact-form select option {
    background: var(--bg-soft);
    color: var(--text);
}

.contact-form textarea {
    margin-bottom: 16px;
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.form-tip {
    margin-top: 12px;
    text-align: center;
    font-size: 12px;
    color: var(--text-dim);
}

/* ===== 页脚 ===== */
.footer {
    position: relative;
    z-index: 1;
    padding: 60px 24px 24px;
    background: rgba(10, 14, 26, 0.92);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(20px);
}

.footer-top {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 48px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--border);
}

.footer-brand p {
    margin-top: 16px;
    color: var(--text-soft);
    font-size: 14px;
    max-width: 320px;
}

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

.footer-col h4 {
    font-size: 14px;
    color: var(--text);
    margin-bottom: 14px;
}

.footer-col a,
.footer-col span {
    display: block;
    padding: 5px 0;
    color: var(--text-soft);
    font-size: 13px;
    transition: color 0.2s;
}

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

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: 22px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--text-dim);
    font-size: 13px;
}

.footer-bottom a:hover {
    color: var(--accent-3);
}

/* ===== 返回顶部 ===== */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient);
    color: #fff;
    border: none;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 8px 24px var(--accent-glow);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 50;
}

.back-top.show {
    opacity: 1;
    visibility: visible;
}

.back-top:hover {
    transform: translateY(-4px) scale(1.05);
}

/* ===== 滚动动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== 响应式适配 ===== */
@media (max-width: 1024px) {
    .advantages-layout,
    .about-wrap,
    .contact-wrap {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

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

@media (max-width: 768px) {
    .section {
        padding: 70px 18px;
    }

    .nav-menu,
    .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu.active {
        display: flex;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: 16px 24px;
        background: rgba(10, 14, 26, 0.98);
        border-bottom: 1px solid var(--border);
        margin: 0;
        gap: 0;
    }

    .nav-menu.active .nav-link {
        padding: 14px 16px;
        border-radius: 0;
        border-bottom: 1px solid var(--border);
    }

    .hero {
        padding: 120px 18px 60px;
    }

    .hero-stats {
        gap: 16px;
        padding: 22px 18px;
    }

    .stat-divider {
        display: none;
    }

    .stat-num {
        font-size: 28px;
    }

    .adv-main,
    .about-points,
    .about-visual {
        grid-template-columns: 1fr;
    }

    .footer-cols {
        grid-template-columns: 1fr 1fr;
    }

    .contact-form {
        padding: 24px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .footer-cols {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}