/* ==========================================================================
   快连 (LetsVPN) - 扁平化构图 · 赛璐璐色彩基调 · 左图右文不对称分布 · 悬浮UI组件
   设计规范与标准样式表
   ========================================================================== */

:root {
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-muted: #6B7280;
    --text-on-dark: #F3F4F6;
    
    /* 赛璐璐高纯度色彩基调 */
    --cel-blue: #1A8CFF;
    --cel-blue-hover: #0F75E0;
    --cel-orange: #FF6B35;
    --cel-yellow: #FFD166;
    --cel-mint: #06D6A0;
    --cel-cream: #FAF8F5;
    --cel-ink: #111827;
    --cel-navy: #0B1220;
    
    /* 扁平化硬边与描边 */
    --flat-border: #E5E7EB;
    --flat-border-bold: #D1D5DB;
    --flat-shadow: 0 4px 14px rgba(17, 24, 39, 0.08);
    --flat-shadow-hover: 0 8px 24px rgba(26, 140, 255, 0.16);
    --light-gray: #F7F9FC;
    --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Inter, system-ui, -apple-system, sans-serif;
}

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

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

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: #FFFFFF;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

/* 1. 公告条：通栏蓝青渐变，高约 46px，左「公告」胶囊，中一句合规+版本提示，右「查看详情」和关闭 */
.top-notice-bar {
    width: 100%;
    height: 46px;
    background: linear-gradient(90deg, #1A8CFF 0%, #00B4D8 50%, #06D6A0 100%);
    color: #FFFFFF;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: relative;
    z-index: 1001;
}

.notice-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.notice-badge {
    background: #111827;
    color: #FFD166;
    border: 1px solid rgba(255, 209, 102, 0.6);
    font-size: 12px;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 999px;
}

.notice-text {
    font-weight: 500;
}

.notice-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.notice-link {
    font-size: 13px;
    font-weight: 600;
    text-decoration: underline;
    color: #FFFFFF;
}

.notice-close {
    cursor: pointer;
    background: none;
    border: none;
    color: #FFFFFF;
    font-size: 18px;
    line-height: 1;
    opacity: 0.85;
}
.notice-close:hover {
    opacity: 1;
}

/* 2. 吸顶顶栏：高 69px，底 rgba(11,18,32,0.92)，sticky */
header {
    position: sticky;
    top: 0;
    width: 100%;
    height: 69px;
    background: rgba(11, 18, 32, 0.94);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    contain: layout style;
}

.logo-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-badge {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: linear-gradient(135deg, #1A8CFF 0%, #FF6B35 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(26, 140, 255, 0.35);
}

.logo-badge img {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.logo-text {
    font-size: 20px;
    font-weight: 800;
    color: #FFFFFF;
    letter-spacing: -0.5px;
}

.logo-text span {
    color: #1A8CFF;
    font-size: 12px;
    font-weight: 700;
    margin-left: 4px;
}

nav .nav-links {
    display: flex;
    list-style: none;
    gap: 6px;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-size: 15px;
    color: #D1D5DB;
    padding: 9px 13px;
    border-radius: 10px;
    display: inline-block;
}

.nav-link:hover, .nav-item:hover > .nav-link {
    color: #FFFFFF;
    background: rgba(26, 140, 255, 0.18);
}

.dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #111827;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 8px;
    min-width: 170px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.55);
    list-style: none;
}

.nav-item:hover .dropdown {
    display: block;
}

.dropdown a {
    display: block;
    padding: 8px 14px;
    font-size: 14px;
    color: #D1D5DB;
    border-radius: 8px;
}

.dropdown a:hover {
    color: #FFFFFF;
    background: rgba(26, 140, 255, 0.2);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    color: #D1D5DB;
    font-size: 14px;
    cursor: pointer;
}

.hamburger-btn {
    display: none;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #FFFFFF;
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
}

/* 实体扁平聚焦按钮 */
.btn-primary {
    background: #1A8CFF;
    color: #FFFFFF;
    font-weight: 700;
    padding: 10px 22px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 14px rgba(26, 140, 255, 0.4);
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--cel-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 140, 255, 0.55);
}

/* 3. 首屏 Hero：上下内边距 76px / 96px。两列网格 504px + 592px（左图右文不对称分布布局） */
.hero-section {
    position: relative;
    background: linear-gradient(135deg, #0B1220 0%, #111827 50%, #162032 100%);
    padding: 76px 0 96px;
    color: #FFFFFF;
    overflow: hidden;
}

/* 赛璐璐色块微妙衬底 */
.hero-section::before {
    content: '';
    position: absolute;
    top: -80px;
    left: -80px;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: rgba(255, 107, 53, 0.12);
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -60px;
    right: -60px;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: rgba(6, 214, 160, 0.1);
    pointer-events: none;
}

.hero-container {
    max-width: 1152px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 504px 592px; /* 左图右文不对称分布 */
    gap: 56px;
    align-items: center;
    position: relative;
    z-index: 2;
}

/* 左列：504x430 扁平化构图 · 悬浮UI组件阵列核心 */
.hero-visual-left {
    width: 504px;
    height: 430px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-card-base {
    width: 480px;
    height: 380px;
    border-radius: 18px;
    background: #182234;
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
    display: flex;
    flex-direction: column;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.card-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.card-badge-cel {
    font-size: 12px;
    font-weight: 700;
    color: #FFD166;
    letter-spacing: 0.5px;
}

.card-img-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 8px;
}

.card-img-wrap img {
    max-width: 90%;
    max-height: 250px;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

/* 赛璐璐核心悬浮UI组件 */
.floating-chip-top {
    position: absolute;
    top: 10px;
    right: -12px;
    background: #FF6B35;
    color: #FFFFFF;
    padding: 7px 14px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 800;
    box-shadow: 0 4px 10px rgba(255, 107, 53, 0.28);
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 6px;
    contain: layout style;
}

.floating-chip-bottom {
    position: absolute;
    bottom: -12px;
    left: -10px;
    background: #06D6A0;
    color: #111827;
    padding: 8px 16px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 6px 18px rgba(6, 214, 160, 0.4);
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 6px;
}

.floating-chip-side {
    position: absolute;
    bottom: 40px;
    right: -16px;
    background: #111827;
    color: #FFD166;
    border: 1px solid #FFD166;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    z-index: 3;
}

/* 右列：592px 文本区 */
.hero-text-right {
    position: relative;
    z-index: 2;
}

.hero-capsule {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 15px;
    border-radius: 9999px;
    background: rgba(26, 140, 255, 0.14);
    border: 1px solid rgba(26, 140, 255, 0.4);
    font-size: 13.5px;
    color: #60A5FA;
    margin-bottom: 22px;
}

.hero-capsule::before {
    content: '●';
    color: #1A8CFF;
    font-size: 10px;
}

.hero-title {
    font-size: 50px;
    font-weight: 800;
    line-height: 1.18;
    letter-spacing: -0.8px;
    color: #FFFFFF;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 18px;
    color: #9CA3AF;
    max-width: 560px;
    line-height: 1.65;
    margin-bottom: 34px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 42px;
}

.hero-btn-main {
    height: 59px;
    padding: 0 34px;
    border-radius: 12px;
    background: #1A8CFF;
    color: #FFFFFF;
    font-size: 16px;
    font-weight: 700;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 6px 20px rgba(26, 140, 255, 0.45);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.hero-btn-main:hover {
    background: var(--cel-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26, 140, 255, 0.6);
}

.hero-btn-sub {
    height: 59px;
    padding: 0 34px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #FFFFFF;
    font-size: 16px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.hero-btn-sub:hover {
    background: rgba(255, 255, 255, 0.16);
    border-color: #FFFFFF;
}

.hero-stats {
    display: flex;
    gap: 38px;
}

.stat-item h4 {
    font-size: 28px;
    font-weight: 800;
    color: #FFD166;
    line-height: 1.1;
    margin-bottom: 4px;
}

.stat-item p {
    font-size: 13px;
    color: #9CA3AF;
}

/* 4. 信任条：白底，四等分、间距 18px，大号蓝数字 + 一行灰说明 */
.trust-bar-section {
    background: #FFFFFF;
    border-bottom: 1px solid #E5E7EB;
    padding: 38px 0;
}

.trust-container {
    max-width: 1152px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.trust-card {
    text-align: center;
    padding: 16px 12px;
    border-radius: 14px;
    background: #FFFFFF;
    border: 1px solid #F3F4F6;
    contain: layout style;
}

.trust-num {
    font-size: 36px;
    font-weight: 800;
    color: #1A8CFF;
    line-height: 1.15;
    margin-bottom: 6px;
}

.trust-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 通用内容区标题公式：浅底胶囊标签 → 40px 标题 → 16px 灰色说明 */
.section-full {
    padding: 72px 0;
    content-visibility: auto;
    contain-intrinsic-size: 1px 650px;
}

.bg-white {
    background-color: #FFFFFF;
}

.bg-light-gray {
    background-color: #F7F9FC;
}

.section-container {
    max-width: 1152px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.center-capsule {
    display: inline-block;
    padding: 5px 14px;
    border-radius: 9999px;
    background: rgba(26, 140, 255, 0.1);
    color: #1A8CFF;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-title {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -0.6px;
    color: #111827;
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 660px;
    margin: 0 auto;
}

/* 5 & 6. 能力区与场景区：3×2 共 6 卡，间距 22px，赛璐璐扁平风 */
.grid-3-col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.card-white, .scene-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 16px;
    padding: 28px 26px;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    contain: layout style;
    position: relative;
}

.card-white:hover, .scene-card:hover {
    border-color: #1A8CFF;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(26, 140, 255, 0.12);
}

.icon-box-48 {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(26, 140, 255, 0.08);
    border: 1px solid rgba(26, 140, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: #1A8CFF;
    font-size: 22px;
}

.card-white h3, .scene-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 10px;
}

.card-white p, .scene-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* 7. 节点证明 #nodes：白底，深色圆角面板放地球/状态图，下方 3 列节点条目（名称左、状态右） */
.proof-panel {
    border-radius: 20px;
    background: #111827;
    color: #FFFFFF;
    padding: 38px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 14px 32px rgba(17, 24, 39, 0.15);
}

.proof-visual {
    text-align: center;
    margin-bottom: 32px;
}

.proof-visual img {
    max-width: 100%;
    max-height: 290px;
    width: auto;
    height: auto;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.proof-status-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.proof-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.proof-item .name {
    font-size: 15px;
    font-weight: 600;
    color: #FFFFFF;
}

.proof-item .status {
    font-size: 13px;
    color: #06D6A0;
    font-weight: 700;
}

/* 8. 价格 #pricing：浅灰底，4 列、间距 20px。专业版是推荐档 */
.grid-4-col {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.pricing-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 18px;
    padding: 30px 24px;
    display: flex;
    flex-direction: column;
    position: relative;
    contain: layout style;
}

.pricing-card.featured {
    border: 2px solid #1A8CFF;
    background: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
    box-shadow: 0 12px 28px rgba(26, 140, 255, 0.15);
    transform: translateY(-4px);
}

.badge-popular {
    position: absolute;
    top: -13px;
    left: 50%;
    transform: translateX(-50%);
    background: #FF6B35;
    color: #FFFFFF;
    font-size: 12px;
    font-weight: 700;
    padding: 3px 14px;
    border-radius: 9999px;
    white-space: nowrap;
}

.plan-name {
    font-size: 20px;
    font-weight: 800;
    color: #111827;
    margin-bottom: 6px;
}

.plan-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 18px;
}

.price-val {
    font-size: 36px;
    font-weight: 800;
    color: #111827;
    margin-bottom: 8px;
}

.price-val span {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 400;
}

.price-note {
    font-size: 13px;
    color: #059669;
    font-weight: 600;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
    margin-bottom: 26px;
    flex-grow: 1;
}

.feature-list li {
    font-size: 14px;
    color: #4B5563;
    margin-bottom: 11px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.feature-list li::before {
    content: '✓';
    color: #1A8CFF;
    font-weight: 800;
}

.btn-outline-price {
    width: 100%;
    padding: 12px 0;
    border-radius: 10px;
    border: 1px solid #D1D5DB;
    background: #FFFFFF;
    color: #111827;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    display: inline-block;
}

.btn-outline-price:hover {
    border-color: #1A8CFF;
    color: #1A8CFF;
}

/* 9. 下载 #download：白底，3 列 6 平台，横向：图标 + 平台名 + 系统要求 + 下载标记 */
.download-item {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 14px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    contain: layout style;
}

.download-item:hover {
    border-color: #1A8CFF;
    box-shadow: 0 6px 16px rgba(26, 140, 255, 0.1);
}

.dl-icon-44 {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: #111827;
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #FFD166;
    flex-shrink: 0;
}

.dl-info {
    flex-grow: 1;
}

.dl-platform {
    font-size: 16px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 2px;
}

.dl-sys {
    font-size: 12px;
    color: var(--text-secondary);
}

.dl-badge {
    font-size: 13px;
    color: #1A8CFF;
    font-weight: 700;
}

/* 10. 步骤 #guide：浅灰底，横向三步：序号、标题、两行说明 */
.step-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 16px;
    text-align: center;
    padding: 28px 22px;
}

.step-num {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: #111827;
    border: 2px solid #1A8CFF;
    color: #FFD166;
    font-size: 18px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.step-title {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 8px;
}

.step-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 11. 评价 #reviews：白底，3 列引言 */
.review-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 16px;
    padding: 28px;
    contain: layout style;
}

.review-stars {
    color: #FF6B35;
    font-size: 14px;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.review-quote {
    font-size: 15px;
    color: #374151;
    line-height: 1.65;
    margin-bottom: 20px;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar-letter {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1A8CFF 0%, #FF6B35 100%);
    color: #FFFFFF;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.author-meta .name {
    font-size: 14px;
    font-weight: 700;
    color: #111827;
}

.author-meta .role {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 12. 问答 #faq：浅灰底，单列手风琴，默认展开第 1 项 */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 14px;
    overflow: hidden;
    contain: layout style;
}

.faq-item.active {
    border-color: #1A8CFF;
    box-shadow: 0 4px 16px rgba(26, 140, 255, 0.08);
}

.faq-q {
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 700;
    color: #111827;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-a {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    display: none;
}

.faq-item.active .faq-a {
    display: block;
}

/* 13. 更新 #blog：白底，3 张文章卡 */
.blog-card {
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 16px;
    padding: 26px;
    display: flex;
    flex-direction: column;
    contain: layout style;
}

.blog-tag {
    font-size: 12px;
    color: #1A8CFF;
    font-weight: 700;
    margin-bottom: 10px;
}

.blog-title {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 10px;
    line-height: 1.4;
}

.blog-summary {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 18px;
    flex-grow: 1;
}

.blog-link {
    font-size: 14px;
    color: #1A8CFF;
    font-weight: 600;
}

/* 14. 页脚：海军蓝底，5 列（品牌简介约 1.5 份 + 产品/套餐/帮助/关于） */
footer {
    background: #0B1220;
    padding: 66px 0 36px;
    color: #9CA3AF;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    content-visibility: auto;
    contain-intrinsic-size: 1px 360px;
}

.footer-top-grid {
    max-width: 1152px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
    gap: 34px;
    margin-bottom: 48px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 10px;
}

.footer-col a {
    color: #9CA3AF;
    font-size: 14px;
}

.footer-col a:hover {
    color: #1A8CFF;
}

.footer-bottom-row {
    max-width: 1152px;
    margin: 0 auto;
    padding: 24px 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: #6B7280;
}

.footer-bottom-row a {
    margin-left: 18px;
    color: #6B7280;
}

/* 15. 悬浮钮：右下固定两个 52px 圆角方块：主色客服、次要回顶 */
.fixed-floating-actions {
    position: fixed;
    right: 24px;
    bottom: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 1002;
}

.float-btn {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.16);
    cursor: pointer;
}

.float-btn-primary {
    background: #1A8CFF;
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.float-btn-secondary {
    background: #FFFFFF;
    color: #111827;
    border: 1px solid #E5E7EB;
}

/* 响应式断点 */
@media (max-width: 1080px) {
    .hero-container {
        grid-template-columns: 1fr;
        padding: 0 24px;
        gap: 40px;
    }
    .hero-visual-left {
        width: 100%;
        max-width: 504px;
        margin: 0 auto;
    }
    .grid-4-col {
        grid-template-columns: repeat(2, 1fr);
    }
    .trust-container {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 980px) {
    header {
        padding: 0 20px;
    }
    nav .nav-links {
        display: none;
        position: absolute;
        top: 69px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: #0B1220;
        padding: 10px 16px 16px;
        gap: 2px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        z-index: 1000;
    }
    nav.nav-open .nav-links {
        display: flex;
    }
    .hamburger-btn {
        display: inline-flex;
    }
    .grid-3-col {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation: none !important;
        transition-duration: 0.01ms !important;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 34px;
    }
    .section-title {
        font-size: 28px;
    }
    .grid-4-col, .trust-container, .proof-status-grid, .footer-top-grid {
        grid-template-columns: 1fr;
    }
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    .hero-btn-main, .hero-btn-sub {
        width: 100%;
    }
}