/* ========================================
   三角洲陪玩网 - 硬核军事风 + 战术电竞风
   深色背景 + 高对比度 + 力量感
   ======================================== */

/* CSS 变量定义 */
:root {
    /* 深色背景系 - 枪黑/军绿 */
    --color-bg: #0a0b0d;
    --color-bg-alt: #0e1012;
    --color-bg-card: #131518;
    --color-bg-elevated: #1a1d21;
    
    /* 军事绿色调 */
    --color-military: #3d5a3d;
    --color-military-light: #4a6b4a;
    --color-military-dark: #2d422d;
    
    /* 强调色 - 橙红/警告色 */
    --color-accent: #ff6b35;
    --color-accent-light: #ff8c5a;
    --color-accent-dark: #e55a2b;
    
    /* 辅助色 */
    --color-gold: #d4a520;
    --color-blue: #3b82f6;
    --color-red: #ef4444;
    --color-green: #22c55e;
    
    /* 文字颜色 */
    --color-text: #f0f0f0;
    --color-text-secondary: #a0a0a8;
    --color-text-muted: #606068;
    
    /* 边框 */
    --color-border: #2a2d32;
    --color-border-light: #3a3d42;
    
    /* 字体 */
    --font-sans: "Rajdhani", -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    --font-display: "Orbitron", "Rajdhani", sans-serif;
    --font-mono: "Share Tech Mono", "Consolas", monospace;
    --font-size: 16px;
    --line-height: 1.7;
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    
    /* 容器 */
    --container: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size);
}

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

::selection {
    background: var(--color-accent);
    color: white;
}

::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-border-light);
}

/* ========================================
   通用样式
   ======================================== */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-accent);
}

ul {
    list-style: none;
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.btn-icon {
    font-size: 0.75rem;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background: var(--color-accent-light);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border-light);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ========================================
   导航
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 11, 13, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo:hover {
    color: var(--color-text);
}

.logo-icon {
    color: var(--color-accent);
    font-size: 1.5rem;
    font-weight: bold;
}

.logo-text {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.logo-tag {
    font-size: 0.6rem;
    color: var(--color-accent);
    letter-spacing: 2px;
    padding: 0.15rem 0.4rem;
    border: 1px solid var(--color-accent);
    margin-left: 0.5rem;
}

.nav-menu {
    display: flex;
    gap: 0.25rem;
}

.nav-menu a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-text);
}

.nav-cta {
    padding: 0.5rem 1.25rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-bg);
    background: var(--color-accent);
    letter-spacing: 0.5px;
    clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

.nav-cta:hover {
    background: var(--color-accent-light);
    color: var(--color-bg);
}

/* ========================================
   Hero
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(64px + var(--space-2xl)) 0 var(--space-2xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(135deg, rgba(61, 90, 61, 0.1) 0%, transparent 50%),
        linear-gradient(45deg, rgba(255, 107, 53, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 53, 0.08) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-accent);
    letter-spacing: 3px;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-accent);
    margin-bottom: var(--space-lg);
    clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

.hero-title {
    margin-bottom: var(--space-lg);
}

.title-line {
    display: block;
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.title-line.accent {
    color: var(--color-accent);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: var(--space-xl);
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
    margin-bottom: var(--space-lg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

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

.stat-value {
    display: block;
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.stat-value sup {
    font-size: 0.5em;
    color: var(--color-accent);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: 0.25rem;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.scroll-arrow {
    font-size: 0.8rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(5px); }
}

/* ========================================
   通用区块
   ======================================== */
.section {
    padding: var(--space-2xl) 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-accent);
    letter-spacing: 2px;
    margin-bottom: var(--space-xs);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: var(--space-xs);
}

.section-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

/* ========================================
   服务卡片
   ======================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.service-card {
    position: relative;
    background: var(--color-bg-card);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
    transition: border-color 0.3s, transform 0.3s;
}

.service-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
}

.service-card.featured {
    border-color: var(--color-accent);
}

.card-badge {
    position: absolute;
    top: 0;
    right: 16px;
    padding: 0.3rem 0.75rem;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-bg);
    background: var(--color-accent);
}

.card-corner {
    position: absolute;
    top: 0;
    right: 0;
    width: 16px;
    height: 16px;
    background: var(--color-border);
}

.service-card.featured .card-corner {
    background: var(--color-accent);
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.card-icon {
    color: var(--color-accent);
    font-size: 1.25rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.card-subtitle {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
    margin-top: 0.15rem;
}

.card-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.card-features {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.card-features li {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    padding: 0.35rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.card-features li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 0.7rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.price-label {
    display: block;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
}

.price-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.price-value small {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

.card-btn {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    clip-path: polygon(0 0, calc(100% - 4px) 0, 100% 4px, 100% 100%, 4px 100%, 0 calc(100% - 4px));
}

.card-btn:hover {
    background: var(--color-accent);
    color: var(--color-bg);
}

/* ========================================
   价格表
   ======================================== */
.pricing-table {
    background: var(--color-bg-card);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
}

.pricing-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: var(--space-md);
}

.title-icon {
    color: var(--color-accent);
}

.pricing-table table {
    width: 100%;
    border-collapse: collapse;
}

.pricing-table th,
.pricing-table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
}

.pricing-table th {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--color-bg-elevated);
}

.pricing-table tr:hover td {
    background: var(--color-bg-elevated);
}

.pricing-table tr.highlight td {
    background: rgba(255, 107, 53, 0.08);
}

.level-badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--color-text);
    background: var(--color-border);
    margin-right: 0.5rem;
}

.level-badge.gold {
    background: var(--color-gold);
    color: var(--color-bg);
}

.level-badge.diamond {
    background: var(--color-blue);
    color: white;
}

.level-badge.legend {
    background: var(--color-accent);
    color: white;
}

/* ========================================
   流程
   ======================================== */
.process-timeline {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.process-step {
    flex: 1;
    text-align: center;
    position: relative;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
    background: var(--color-bg-card);
    border: 2px solid var(--color-accent);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    margin-bottom: var(--space-md);
}

.step-content h3 {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.step-content p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 180px;
    margin: 0 auto;
}

.step-line {
    position: absolute;
    top: 28px;
    left: calc(50% + 35px);
    width: calc(100% - 70px);
    height: 2px;
    background: var(--color-border);
}

.process-step:last-child .step-line {
    display: none;
}

/* ========================================
   头像展示
   ======================================== */
.avatars-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.avatar-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: border-color 0.3s, transform 0.3s;
}

.avatar-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.avatar-image {
    aspect-ratio: 1;
    background: var(--color-bg-elevated);
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-card) 100%);
}

.avatar-info {
    padding: var(--space-sm);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.avatar-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.avatar-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

.avatars-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-align: center;
}

/* ========================================
   伤害计算器
   ======================================== */
.calculator-intro {
    max-width: 700px;
    margin: 0 auto var(--space-lg);
    text-align: center;
}

.calculator-intro p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.damage-table {
    overflow-x: auto;
    margin-bottom: var(--space-lg);
}

.damage-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-bg-card);
}

.damage-table th,
.damage-table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
}

.damage-table th {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--color-bg-elevated);
}

.damage-table tr:hover td {
    background: var(--color-bg-elevated);
}

.weapon-type {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: 2px;
}

.weapon-type.ar {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-blue);
}

.weapon-type.smg {
    background: rgba(34, 197, 94, 0.2);
    color: var(--color-green);
}

.weapon-type.sniper {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-red);
}

.weapon-type.lmg {
    background: rgba(212, 165, 32, 0.2);
    color: var(--color-gold);
}

.weapon-type.sg {
    background: rgba(255, 107, 53, 0.2);
    color: var(--color-accent);
}

.calculator-notes {
    background: var(--color-bg-card);
    padding: var(--space-md);
    border: 1px solid var(--color-border);
}

.calculator-notes h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.calculator-notes li {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    padding: 0.3rem 0;
}

.calculator-notes strong {
    color: var(--color-text);
}

/* ========================================
   游戏技巧
   ======================================== */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.tip-card {
    background: var(--color-bg-card);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
    transition: border-color 0.3s;
}

.tip-card:hover {
    border-color: var(--color-border-light);
}

.tip-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.tip-category {
    font-size: 0.7rem;
    color: var(--color-accent);
    letter-spacing: 0.5px;
}

.tip-level {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    padding: 0.2rem 0.5rem;
    background: var(--color-bg-elevated);
    letter-spacing: 0.5px;
}

.tip-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.tip-card > p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
}

.tip-points {
    list-style: none;
}

.tip-points li {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    padding: 0.25rem 0;
    padding-left: 1rem;
    position: relative;
}

.tip-points li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 0.7rem;
}

/* ========================================
   FAQ
   ======================================== */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.faq-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.faq-item summary {
    display: block;
    padding: var(--space-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    position: relative;
    padding-right: 2.5rem;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-accent);
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-answer {
    padding: 0 var(--space-md) var(--space-md);
}

.faq-answer p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.faq-answer ul {
    list-style: none;
}

.faq-answer li {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    padding: 0.25rem 0;
    padding-left: 1rem;
    position: relative;
}

.faq-answer li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 0.7rem;
}

/* ========================================
   联系
   ======================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-xl);
    align-items: start;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.info-card {
    background: var(--color-bg-card);
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    text-align: center;
}

.info-icon {
    display: block;
    font-size: 1.25rem;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.info-card h4 {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.info-card p {
    font-size: 1rem;
    font-weight: 600;
}

.contact-form {
    background: var(--color-bg-card);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 0.4rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-text);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

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

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%23606068" stroke-width="2"><polyline points="6,9 12,15 18,9"/></svg>');
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 1rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: white;
    background: var(--color-accent);
    border: none;
    cursor: pointer;
    clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
    transition: background 0.2s;
}

.btn-submit:hover {
    background: var(--color-accent-light);
}

.btn-submit .btn-icon {
    font-size: 0.75rem;
}

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

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.footer-brand .logo {
    margin-bottom: var(--space-sm);
}

.footer-brand > p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

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

.footer-column h4 {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

.footer-column li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

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

.footer-bottom {
    padding-top: var(--space-lg);
}

.footer-bottom p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: center;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
    .nav-menu {
        display: none;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .process-timeline {
        flex-wrap: wrap;
        gap: var(--space-lg);
    }
    
    .process-step {
        flex: 0 0 calc(33.333% - var(--space-md));
    }
    
    .step-line {
        display: none;
    }
    
    .avatars-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .title-line {
        font-size: 2.25rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: var(--space-md);
    }
    
    .stat-item {
        flex: 1 1 40%;
    }
    
    .stat-divider {
        display: none;
    }
    
    .services-grid,
    .faq-grid,
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .process-step {
        flex: 0 0 100%;
    }
    
    .avatars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}