/* ===== 基础重置与变量 ===== */
:root {
    --primary: #7C3AED;
    --primary-light: #8B5CF6;
    --primary-dark: #6D28D9;
    --secondary: #EC4899;
    --accent: #06B6D4;
    --gradient-1: linear-gradient(135deg, #7C3AED, #EC4899);
    --gradient-2: linear-gradient(135deg, #7C3AED, #06B6D4);
    --gradient-3: linear-gradient(135deg, #EC4899, #F97316);
    --dark: #0F0F1A;
    --dark-2: #1A1A2E;
    --dark-3: #16213E;
    --text: #E2E8F0;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.08);
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.06);
    --max-width: 1200px;
    --header-height: 72px;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    background: var(--dark);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(15, 15, 26, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(15, 15, 26, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: var(--gradient-1);
    border-radius: 10px;
    font-size: 18px;
    font-weight: 900;
    color: #fff;
}

.logo-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-list {
    display: flex;
    gap: 4px;
}

.nav-link {
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text);
    background: var(--card-bg);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--gradient-1);
    border-radius: 2px;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 8px;
    z-index: 100;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

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

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

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

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

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

.gradient-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    animation: float 8s ease-in-out infinite;
}

.circle-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.circle-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    bottom: 100px;
    left: -100px;
    animation-delay: -3s;
}

.circle-3 {
    width: 300px;
    height: 300px;
    background: var(--accent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -6s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, 30px) scale(0.95); }
    75% { transform: translate(40px, 20px) scale(1.05); }
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 60px;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-number {
    font-size: 36px;
    font-weight: 900;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-unit {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-left: 2px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== 手机样机 ===== */
.hero-mockup {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: linear-gradient(145deg, #1a1a2e, #16213e);
    border-radius: 40px;
    padding: 12px;
    position: relative;
    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.5),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    animation: phoneFloat 6s ease-in-out infinite;
}

@keyframes phoneFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.phone-notch {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 24px;
    background: #0a0a1a;
    border-radius: 0 0 16px 16px;
    z-index: 2;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #0f0f23, #1a0a2e);
    border-radius: 30px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 32px 16px 12px;
    background: rgba(124, 58, 237, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.app-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
}

.app-status {
    font-size: 11px;
    color: #10B981;
    display: flex;
    align-items: center;
    gap: 4px;
}

.app-status::before {
    content: '';
    width: 6px;
    height: 6px;
    background: #10B981;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.chat-messages {
    flex: 1;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow: hidden;
}

.message {
    display: flex;
    gap: 8px;
    align-items: flex-start;
    max-width: 85%;
}

.message.sent {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.msg-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    flex-shrink: 0;
    background: var(--gradient-1);
}

.message.sent .msg-avatar {
    background: var(--gradient-3);
}

.msg-content {
    padding: 8px 14px;
    border-radius: 16px;
    font-size: 12px;
    line-height: 1.5;
}

.message.received .msg-content {
    background: rgba(255, 255, 255, 0.08);
    border-top-left-radius: 4px;
}

.message.sent .msg-content {
    background: var(--gradient-1);
    color: #fff;
    border-top-right-radius: 4px;
}

.typing-dots {
    display: flex;
    gap: 3px;
    padding: 4px 0;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-6px); }
}

.chat-input-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: auto;
}

.input-placeholder {
    font-size: 12px;
    color: var(--text-muted);
}

.send-btn {
    width: 28px;
    height: 28px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: #fff;
    cursor: pointer;
}

/* ===== 产品特色 ===== */
.features {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: 16px;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
}

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

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

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(124, 58, 237, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

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

.feature-icon {
    width: 52px;
    height: 52px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--primary-light);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--gradient-1);
    color: #fff;
}

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

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== 关于我们 ===== */
.about {
    padding: 120px 0;
    background: var(--dark-2);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-text p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 16px;
}

.about-mission {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mission-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 16px 20px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--card-border);
}

.mission-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.mission-item h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
}

.mission-item p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.about-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.about-card-header {
    padding: 20px 24px;
    background: rgba(124, 58, 237, 0.1);
    border-bottom: 1px solid var(--card-border);
}

.company-badge {
    font-size: 18px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-card-body {
    padding: 24px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--card-border);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-size: 14px;
    color: var(--text-muted);
}

.info-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

/* ===== 下载区域 ===== */
.download {
    padding: 120px 0;
    position: relative;
}

.download-wrapper {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(236, 72, 153, 0.1));
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-border);
    padding: 80px 60px;
    text-align: center;
}

.download-title {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: 16px;
}

.download-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn-download {
    padding: 14px 32px;
    border-radius: 14px;
    background: var(--dark);
    border: 1px solid var(--card-border);
    color: var(--text);
}

.btn-download:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.download-icon {
    width: 28px;
    height: 28px;
}

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

.download-text small {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
}

.download-text span {
    font-size: 15px;
    font-weight: 700;
}

.qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.qr-code {
    width: 140px;
    height: 140px;
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-placeholder {
    text-align: center;
}

.qr-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 3px;
    margin-bottom: 8px;
}

.qr-grid span {
    display: block;
    aspect-ratio: 1;
    background: #000;
    border-radius: 1px;
}

.qr-grid span:nth-child(odd) {
    background: #000;
}

.qr-grid span:nth-child(even) {
    background: transparent;
}

.qr-label {
    font-size: 10px;
    color: #666;
    font-weight: 500;
}

.qr-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 12px;
}

/* ===== 联系我们 ===== */
.contact {
    padding: 120px 0;
    background: var(--dark-2);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 20px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--card-border);
    transition: var(--transition);
}

.contact-item:hover {
    border-color: rgba(124, 58, 237, 0.3);
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 20px;
    height: 20px;
    color: var(--primary-light);
}

.contact-detail h4 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 500;
}

.contact-detail a,
.contact-detail p {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    transition: var(--transition);
}

.contact-detail a:hover {
    color: var(--primary-light);
}

.contact-form {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 36px;
}

.form-header {
    margin-bottom: 28px;
}

.form-header h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.form-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 16px;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    background: var(--glass);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit {
    width: 100%;
    justify-content: center;
    padding: 16px;
    font-size: 16px;
    margin-top: 8px;
}

/* ===== 页脚 ===== */
.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--card-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-secondary);
    max-width: 280px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-col h4 {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--card-border);
    text-align: center;
}

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

.footer-bottom a {
    color: var(--text-muted);
}

.footer-bottom a:hover {
    color: var(--primary-light);
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--gradient-1);
    border: none;
    border-radius: 12px;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-desc {
        margin: 0 auto 36px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

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

    .hero-mockup {
        display: none;
    }

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

    .about-content {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .download-wrapper {
        padding: 60px 30px;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        background: var(--dark-2);
        border-left: 1px solid var(--card-border);
        padding: 80px 24px 24px;
        transition: var(--transition);
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 8px;
    }

    .nav-link {
        display: block;
        padding: 12px 16px;
        font-size: 16px;
    }

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 34px;
    }

    .hero-desc {
        font-size: 16px;
    }

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

    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

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

    .section-title {
        font-size: 32px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .download-wrapper {
        padding: 40px 20px;
    }

    .download-title {
        font-size: 30px;
    }

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

    .contact-form {
        padding: 24px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .container {
        padding: 0 16px;
    }

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

    .section-title {
        font-size: 28px;
    }
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark);
}

::-webkit-scrollbar-thumb {
    background: var(--dark-3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}