/* ============================================================
   TRC20钱包 - 波场TRON主题样式
   配色: 深色(#0a0e1c) + 波场红(#eb0f29) + 科技蓝(#1e40af) 
        + 安全绿(#10b981) + 金色(#f59e0b) + 白(#ffffff)
   ============================================================ */

:root {
    --bg-dark: #0a0e1c;
    --bg-card: #111827;
    --bg-card-hover: #1a1f35;
    --tron-red: #eb0f29;
    --tron-red-light: #ff1a3a;
    --tech-blue: #1e40af;
    --tech-blue-light: #3b82f6;
    --safe-green: #10b981;
    --safe-green-light: #34d399;
    --gold: #f59e0b;
    --gold-light: #fbbf24;
    --white: #ffffff;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow-red: 0 0 20px rgba(235,15,41,0.4);
    --shadow-glow-blue: 0 0 20px rgba(30,64,175,0.4);
    --shadow-glow-green: 0 0 20px rgba(16,185,129,0.4);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-dark);
    color: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--tech-blue-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--tron-red-light);
}

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

ul {
    list-style: none;
}

/* ============ 导航栏 ============ */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10,14,28,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(235,15,41,0.15);
    transition: all var(--transition-normal);
}

header.scrolled {
    box-shadow: 0 4px 20px rgba(235,15,41,0.1);
}

header nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: -0.3px;
}

.nav-brand .brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--tron-red), var(--tron-red-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--white);
    box-shadow: var(--shadow-glow-red);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--gray-300);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 6px 0;
    transition: color var(--transition-fast);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--tron-red);
    transition: width var(--transition-normal);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--white);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-cta {
    padding: 8px 20px !important;
    background: linear-gradient(135deg, var(--tron-red), var(--tron-red-light));
    border-radius: 25px;
    color: var(--white) !important;
    font-weight: 600;
    box-shadow: var(--shadow-glow-red);
    transition: all var(--transition-normal);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 28px rgba(235,15,41,0.55);
}

.nav-cta::after {
    display: none !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
    background: none;
    border: none;
    z-index: 1001;
}

.nav-toggle span {
    display: block;
    width: 26px;
    height: 2.5px;
    background: var(--white);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ============ Hero 区域 ============ */
.hero {
    padding: 140px 24px 100px;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 140%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 30%, rgba(235,15,41,0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(30,64,175,0.1) 0%, transparent 60%),
                radial-gradient(ellipse at 50% 80%, rgba(16,185,129,0.05) 0%, transparent 50%);
    pointer-events: none;
    animation: heroBgPulse 8s ease-in-out infinite;
}

@keyframes heroBgPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.hero .container {
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(235,15,41,0.12);
    border: 1px solid rgba(235,15,41,0.3);
    border-radius: 25px;
    font-size: 0.85rem;
    color: var(--tron-red-light);
    font-weight: 600;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--white) 30%, var(--tron-red-light) 60%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero h2 {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--gray-300);
    font-weight: 400;
    max-width: 700px;
    margin: 0 auto 36px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-tags span {
    padding: 8px 18px;
    background: rgba(30,64,175,0.15);
    border: 1px solid rgba(30,64,175,0.3);
    border-radius: 20px;
    font-size: 0.88rem;
    color: var(--tech-blue-light);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-tags span::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--safe-green);
    border-radius: 50%;
    display: inline-block;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* ============ 按钮样式 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 28px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-decoration: none;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--tron-red), #c90b22);
    color: var(--white);
    box-shadow: var(--shadow-glow-red);
    animation: ctaPulse 2s ease-in-out infinite;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 35px rgba(235,15,41,0.6);
    color: var(--white);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--tech-blue);
}

.btn-secondary:hover {
    background: rgba(30,64,175,0.2);
    border-color: var(--tech-blue-light);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--safe-green);
    border: 2px solid var(--safe-green);
}

.btn-outline:hover {
    background: rgba(16,185,129,0.15);
    color: var(--safe-green-light);
}

.btn-lg {
    padding: 18px 40px;
    font-size: 1.1rem;
    border-radius: 32px;
}

@keyframes ctaPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(235,15,41,0.4); }
    50% { box-shadow: 0 0 40px rgba(235,15,41,0.7), 0 0 60px rgba(235,15,41,0.3); }
}

/* ============ Section 通用 ============ */
.section {
    padding: 100px 24px;
}

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

.section-header h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--white);
}

.section-header p {
    font-size: 1.05rem;
    color: var(--gray-400);
    max-width: 600px;
    margin: 0 auto;
}

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

/* ============ 特性 / 优势 网格 ============ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid rgba(30,64,175,0.15);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--tron-red), var(--tech-blue), var(--safe-green), var(--gold));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    border-color: rgba(30,64,175,0.4);
}

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

.feature-card .card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 20px;
}

.feature-card .card-icon.red { background: rgba(235,15,41,0.15); color: var(--tron-red-light); }
.feature-card .card-icon.blue { background: rgba(30,64,175,0.2); color: var(--tech-blue-light); }
.feature-card .card-icon.green { background: rgba(16,185,129,0.15); color: var(--safe-green); }
.feature-card .card-icon.gold { background: rgba(245,158,11,0.15); color: var(--gold); }

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--white);
}

.feature-card p {
    font-size: 0.93rem;
    color: var(--gray-400);
    line-height: 1.7;
}

/* ============ 钱包功能展示区 ============ */
#wallet-features {
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(30,64,175,0.05) 50%, var(--bg-dark) 100%);
}

.wallet-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.wallet-showcase .showcase-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(30,64,175,0.2);
}

.wallet-showcase .showcase-content h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--white);
}

.wallet-showcase .showcase-content p {
    color: var(--gray-400);
    margin-bottom: 24px;
    font-size: 1rem;
}

.wallet-showcase .showcase-list {
    display: grid;
    gap: 12px;
}

.wallet-showcase .showcase-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--gray-300);
    font-size: 0.95rem;
}

.wallet-showcase .showcase-list li::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    min-width: 6px;
    background: var(--safe-green);
    border-radius: 50%;
    margin-top: 8px;
}

/* ============ CTA 区域 ============ */
#cta {
    background: linear-gradient(135deg, rgba(235,15,41,0.08) 0%, rgba(30,64,175,0.1) 50%, rgba(16,185,129,0.05) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

#cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23eb0f29' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

#cta .container {
    position: relative;
    z-index: 1;
}

#cta h2 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin-bottom: 16px;
}

#cta p {
    color: var(--gray-400);
    max-width: 550px;
    margin: 0 auto 32px;
    font-size: 1.05rem;
}

#cta .btn-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

/* ============ 关于页面 ============ */
.about-hero {
    padding: 140px 24px 80px;
    text-align: center;
}

.about-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--white), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-section {
    padding: 60px 24px;
}

.about-section:nth-child(even) {
    background: rgba(17,24,39,0.5);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-grid .about-img {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-grid .about-text h2 {
    font-size: 1.7rem;
    margin-bottom: 20px;
    color: var(--white);
}

.about-grid .about-text p {
    color: var(--gray-400);
    margin-bottom: 16px;
    font-size: 0.98rem;
}

/* 时间线 */
.timeline {
    position: relative;
    padding: 40px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--tron-red), var(--tech-blue), var(--safe-green));
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-item .timeline-dot {
    position: absolute;
    left: 50%;
    top: 8px;
    width: 16px;
    height: 16px;
    background: var(--tron-red);
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: var(--shadow-glow-red);
    z-index: 2;
}

.timeline-item .timeline-content {
    width: 45%;
    background: var(--bg-card);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(30,64,175,0.15);
}

.timeline-item .timeline-content .year {
    font-size: 0.85rem;
    color: var(--tron-red-light);
    font-weight: 700;
    margin-bottom: 6px;
}

.timeline-item .timeline-content h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.timeline-item .timeline-content p {
    color: var(--gray-400);
    font-size: 0.9rem;
}

.timeline-item .timeline-placeholder {
    width: 45%;
}

/* ============ 服务页面 ============ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid rgba(30,64,175,0.15);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    transition: all var(--transition-normal);
    text-align: center;
}

.service-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    border-color: rgba(235,15,41,0.3);
}

.service-card .service-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.service-card .service-icon.red { background: linear-gradient(135deg, rgba(235,15,41,0.2), rgba(235,15,41,0.1)); color: var(--tron-red-light); }
.service-card .service-icon.blue { background: linear-gradient(135deg, rgba(30,64,175,0.2), rgba(30,64,175,0.1)); color: var(--tech-blue-light); }
.service-card .service-icon.green { background: linear-gradient(135deg, rgba(16,185,129,0.2), rgba(16,185,129,0.1)); color: var(--safe-green); }
.service-card .service-icon.gold { background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(245,158,11,0.1)); color: var(--gold); }

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--white);
}

.service-card p {
    font-size: 0.93rem;
    color: var(--gray-400);
    line-height: 1.7;
}

/* ============ 区块链节点动画 ============ */
.blockchain-nodes {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    padding: 60px 0;
    flex-wrap: wrap;
}

.node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    position: relative;
}

.node .node-dot {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--tech-blue);
    box-shadow: var(--shadow-glow-blue);
    animation: nodePulse 2s ease-in-out infinite;
    position: relative;
}

.node .node-dot.red { background: var(--tron-red); box-shadow: var(--shadow-glow-red); animation-delay: 0s; }
.node .node-dot.blue { background: var(--tech-blue); box-shadow: var(--shadow-glow-blue); animation-delay: 0.4s; }
.node .node-dot.green { background: var(--safe-green); box-shadow: var(--shadow-glow-green); animation-delay: 0.8s; }
.node .node-dot.gold { background: var(--gold); box-shadow: 0 0 20px rgba(245,158,11,0.4); animation-delay: 1.2s; }

.node .node-label {
    font-size: 0.85rem;
    color: var(--gray-400);
    text-align: center;
}

@keyframes nodePulse {
    0%, 100% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.25); opacity: 1; }
}

/* 连接线 */
.node-connector {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--tech-blue), var(--tron-red));
    align-self: center;
    margin-bottom: 28px;
    opacity: 0.6;
}

/* ============ FAQ 页面 ============ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-category {
    margin-bottom: 48px;
}

.faq-category h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(235,15,41,0.3);
    color: var(--white);
}

.faq-item {
    margin-bottom: 2px;
}

.faq-item details {
    background: var(--bg-card);
    border: 1px solid rgba(30,64,175,0.1);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq-item details:hover {
    border-color: rgba(30,64,175,0.3);
}

.faq-item details[open] {
    border-color: rgba(235,15,41,0.3);
}

.faq-item summary {
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.02rem;
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: color var(--transition-fast);
}

.faq-item summary:hover {
    color: var(--tron-red-light);
}

.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 300;
    color: var(--tron-red);
    transition: transform var(--transition-fast);
}

.faq-item details[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-item .faq-answer {
    padding: 0 24px 20px;
    color: var(--gray-400);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ============ 联系页面 ============ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-form {
    background: var(--bg-card);
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(30,64,175,0.15);
}

.contact-form h2 {
    margin-bottom: 24px;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--gray-300);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-dark);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--tech-blue-light);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-card {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(30,64,175,0.15);
}

.contact-card h3 {
    margin-bottom: 12px;
    font-size: 1.1rem;
    color: var(--white);
}

.contact-card p {
    color: var(--gray-400);
    font-size: 0.93rem;
    line-height: 1.7;
}

.contact-card .contact-method {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    color: var(--gray-300);
}

/* ============ 页脚 ============ */
footer {
    background: rgba(17,24,39,0.8);
    border-top: 1px solid rgba(235,15,41,0.12);
    padding: 48px 24px 28px;
}

.footer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 36px;
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 16px;
    font-size: 1rem;
}

.footer-col a {
    display: block;
    color: var(--gray-400);
    font-size: 0.9rem;
    margin-bottom: 8px;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--tron-red-light);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 20px;
    border-top: 1px solid var(--gray-800);
    text-align: center;
    color: var(--gray-500);
    font-size: 0.85rem;
}

/* ============ 动画类 ============ */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============ 统计数字栏 ============ */
.stats-bar {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 48px;
    padding: 48px 24px;
    background: rgba(235,15,41,0.03);
    border-top: 1px solid rgba(235,15,41,0.08);
    border-bottom: 1px solid rgba(235,15,41,0.08);
}

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

.stat-item .stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--tron-red-light);
    margin-bottom: 6px;
}

.stat-item .stat-label {
    font-size: 0.88rem;
    color: var(--gray-400);
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
    .wallet-showcase {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

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

    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        flex-direction: row;
        padding-left: 50px;
    }

    .timeline-item .timeline-dot {
        left: 20px;
    }

    .timeline-item .timeline-content {
        width: 100%;
    }

    .timeline-item .timeline-placeholder {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-card);
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 20px;
        transition: right var(--transition-normal);
        box-shadow: var(--shadow-lg);
        z-index: 1000;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 20px 60px;
    }

    .section {
        padding: 60px 20px;
    }

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

    .stats-bar {
        gap: 28px;
    }

    .stat-item .stat-number {
        font-size: 1.7rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .hero-tags {
        gap: 8px;
    }

    .hero-tags span {
        padding: 6px 14px;
        font-size: 0.8rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 1rem;
    }
}