/* ==========================================================================
   快连 LetsVPN 官方网站样式表
   视觉风格：有机流体呈现，幽灵白与深邃蓝基调，F型阅读版式，粒子爆炸特效视觉
   设计规范：60fps 丝滑交互、高性能 GPU 渲染、响应式适配
   ========================================================================== */

:root {
    /* 幽灵白与深邃蓝色彩系统 */
    --c-ghost-white: #F8FAFC;
    --c-pure-white: #FFFFFF;
    --c-light-slate: #F1F5F9;
    --c-border-subtle: #E2E8F0;
    
    --c-deep-blue: #0A192F;
    --c-navy-dark: #0D2149;
    --c-ocean-blue: #0052D4;
    --c-azure-primary: #0077B6;
    --c-electric-cyan: #00D2FF;
    --c-glow-teal: #38EF7D;
    
    --c-hero-navy: rgba(10, 25, 47, 0.94);

    --text-heading: #0F172A;
    --text-body: #334155;
    --text-muted: #64748B;
    --text-light: #94A3B8;

    /* 有机流体阴影与微光系统 */
    --shadow-soft: 0 4px 20px rgba(10, 25, 47, 0.05);
    --shadow-card: 0 10px 30px rgba(10, 25, 47, 0.07);
    --shadow-hover: 0 18px 40px rgba(0, 82, 212, 0.14);
    --shadow-particle: 0 0 25px rgba(0, 210, 255, 0.45);

    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--c-ghost-white);
    color: var(--text-heading);
    font-family: var(--font-stack);
    -webkit-font-smoothing: antialiased;
}

body {
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    background: linear-gradient(180deg, #F8FAFC 0%, #F1F5F9 50%, #F8FAFC 100%);
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.25s ease;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* 粒子爆炸特效 Canvas 容器 (轻量级，性能保障) */
#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* 1. 通栏公告条：版本/活动一句话 + 关闭，高约 46px */
.top-notice-bar {
    height: 46px;
    background: linear-gradient(90deg, #0A192F 0%, #0052D4 50%, #00D2FF 100%);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    font-size: 13.5px;
    z-index: 1001;
    position: relative;
    box-shadow: 0 2px 10px rgba(0, 82, 212, 0.2);
}

.notice-left {
    display: flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.notice-badge {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

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

.notice-right {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

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

.notice-close {
    color: #FFFFFF;
    font-size: 18px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    transition: all 0.2s;
}

.notice-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 2. 粘性顶栏：Logo | 5 个锚点 | 语言 | 登录 | 主 CTA */
header {
    height: 69px;
    background: var(--c-hero-navy);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    box-shadow: 0 8px 24px rgba(10, 25, 47, 0.3);
    border-bottom: 1px solid rgba(0, 210, 255, 0.2);
}

.logo-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-badge {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(0, 210, 255, 0.4);
    transition: transform 0.2s;
}

.logo-badge:hover {
    transform: rotate(-6deg) scale(1.05);
}

.logo-badge img {
    width: 22px;
    height: 22px;
}

.logo-text {
    font-size: 20px;
    font-weight: 900;
    color: #FFFFFF;
    letter-spacing: -0.5px;
    display: flex;
    align-items: baseline;
    gap: 6px;
}

.logo-text span {
    font-size: 13px;
    font-weight: 700;
    background: linear-gradient(90deg, #00D2FF, #38EF7D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
}

nav .nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14.5px;
    font-weight: 600;
    position: relative;
    padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
    color: #FFFFFF;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #0052D4, #00D2FF);
    border-radius: 999px;
    transition: all 0.25s ease;
    transform: translateX(-50%);
}

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

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

.lang-switch {
    font-size: 13px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.75);
    background: rgba(255, 255, 255, 0.08);
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-header-login {
    font-size: 14px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.85);
    padding: 6px 12px;
    transition: color 0.2s;
}

.btn-header-login:hover {
    color: #00D2FF;
}

.btn-primary {
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    font-size: 14px;
    font-weight: 700;
    padding: 10px 22px;
    border-radius: 999px;
    box-shadow: 0 4px 16px rgba(0, 82, 212, 0.4);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 210, 255, 0.5);
}

.btn-primary:active {
    transform: translateY(1px);
}

.hamburger-btn {
    display: none;
    color: #FFFFFF;
    font-size: 24px;
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    align-items: center;
    justify-content: center;
}

/* 3. 首屏 Hero：桌面左文右图，F型阅读动线设计 */
.hero-section {
    padding: 76px 0 96px;
    position: relative;
    overflow: hidden;
    background: radial-gradient(circle at 80% 20%, rgba(0, 210, 255, 0.08) 0%, rgba(248, 250, 252, 0) 70%);
}

.section-container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 592px 504px;
    gap: 56px;
    align-items: center;
}

/* 左侧：胶囊标签 → 超大 H1 → 两行卖点 → 主次 CTA → 徽章 */
.hero-capsule {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #EBF4FF;
    border: 1px solid rgba(0, 82, 212, 0.25);
    color: var(--c-ocean-blue);
    font-size: 13.5px;
    font-weight: 700;
    padding: 6px 16px;
    border-radius: 999px;
    margin-bottom: 22px;
}

.hero-capsule .dot {
    width: 8px;
    height: 8px;
    background: #38EF7D;
    border-radius: 50%;
    box-shadow: 0 0 6px #38EF7D;
}

.hero-title {
    font-size: 42px;
    line-height: 1.25;
    font-weight: 900;
    color: var(--c-deep-blue);
    margin-bottom: 20px;
    letter-spacing: -0.8px;
}

.hero-title span {
    background: linear-gradient(135deg, #0052D4 0%, #00D2FF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 16.5px;
    line-height: 1.8;
    color: var(--text-body);
    margin-bottom: 34px;
}

.hero-cta-group {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 32px;
}

.btn-hero-lg {
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    font-size: 16px;
    font-weight: 800;
    padding: 14px 34px;
    border-radius: 999px;
    box-shadow: 0 10px 24px rgba(0, 82, 212, 0.35);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.25s;
}

.btn-hero-lg:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 30px rgba(0, 210, 255, 0.45);
}

.btn-hero-sub {
    background: #FFFFFF;
    color: var(--c-deep-blue);
    font-size: 15px;
    font-weight: 700;
    padding: 13px 28px;
    border-radius: 999px;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--c-border-subtle);
    transition: all 0.25s;
}

.btn-hero-sub:hover {
    border-color: #00D2FF;
    color: var(--c-ocean-blue);
    transform: translateY(-2px);
}

.hero-badges-row {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 13px;
    color: var(--text-muted);
}

.hero-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--c-border-subtle);
    padding: 4px 12px;
    border-radius: 999px;
}

/* 右侧：抽象可视化 + 3 张浮卡 (结合 1.webp，非真实复杂地图) */
.hero-visual-wrap {
    position: relative;
}

.fluid-stage-card {
    background: #FFFFFF;
    border-radius: 28px;
    padding: 16px;
    box-shadow: var(--shadow-card);
    border: 2px solid rgba(0, 210, 255, 0.25);
    position: relative;
    z-index: 1;
}

.fluid-stage-card img {
    border-radius: 20px;
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* 3 张核心指标浮卡 */
.floating-stat-card {
    position: absolute;
    background: #FFFFFF;
    border-radius: 18px;
    padding: 12px 18px;
    box-shadow: var(--shadow-hover);
    border: 1px solid rgba(0, 210, 255, 0.35);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 3;
    animation: statFloat 4s ease-in-out infinite alternate;
}

.stat-card-1 {
    top: -20px;
    right: -20px;
}

.stat-card-2 {
    bottom: -20px;
    left: -20px;
    animation-delay: -2s;
}

.stat-card-3 {
    top: 50%;
    left: -28px;
    transform: translateY(-50%);
    animation: statPulse 3s ease-in-out infinite alternate;
}

@keyframes statFloat {
    0% { transform: translateY(0); }
    100% { transform: translateY(-8px); }
}

@keyframes statPulse {
    0% { transform: translateY(-50%) scale(1); }
    100% { transform: translateY(-50%) scale(1.04); }
}

.stat-card-icon {
    width: 36px;
    height: 36px;
    background: #EBF4FF;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--c-ocean-blue);
}

.stat-card-info h4 {
    font-size: 14px;
    font-weight: 800;
    color: var(--c-deep-blue);
}

.stat-card-info p {
    font-size: 11.5px;
    color: var(--text-muted);
}

/* 4. 信任条：4 个 KPI */
.trust-bar-section {
    background: var(--c-pure-white);
    padding: 38px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.trust-item {
    background: var(--c-ghost-white);
    border-radius: 20px;
    padding: 24px 18px;
    text-align: center;
    border: 1px solid var(--c-border-subtle);
    box-shadow: var(--shadow-soft);
    transition: transform 0.25s, box-shadow 0.25s;
}

.trust-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card);
}

.trust-num {
    font-size: 36px;
    font-weight: 900;
    color: var(--c-ocean-blue);
    line-height: 1.1;
    margin-bottom: 6px;
    font-variant-numeric: tabular-nums;
}

.trust-label {
    font-size: 13.5px;
    color: var(--text-muted);
    font-weight: 500;
}

/* 通用区块标题公式 */
.section-full {
    padding: 80px 0;
    content-visibility: auto;
}

.bg-white {
    background-color: var(--c-pure-white);
}

.bg-light-gray {
    background-color: var(--c-light-slate);
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 52px;
}

.center-capsule {
    display: inline-block;
    background: #EBF4FF;
    color: var(--c-ocean-blue);
    font-size: 12.5px;
    font-weight: 800;
    padding: 5px 16px;
    border-radius: 999px;
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid rgba(0, 82, 212, 0.2);
}

.section-title {
    font-size: 34px;
    font-weight: 900;
    color: var(--c-deep-blue);
    margin-bottom: 14px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 15.5px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* 5. 功能：3×2 卡片（图标 + 标题 + 一句说明 + 文字链） */
.grid-3-col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.feature-fluid-card {
    background: var(--c-pure-white);
    border-radius: 24px;
    padding: 32px 26px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--c-border-subtle);
    transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.feature-fluid-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: #00D2FF;
}

.feature-icon-box {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, #EBF4FF, #E0F2FE);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--c-ocean-blue);
}

.feature-fluid-card h3 {
    font-size: 19px;
    font-weight: 800;
    color: var(--c-deep-blue);
    margin-bottom: 12px;
}

.feature-fluid-card p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.75;
    margin-bottom: 18px;
}

.feature-text-link {
    font-size: 13.5px;
    font-weight: 700;
    color: var(--c-ocean-blue);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.feature-text-link:hover {
    color: #00D2FF;
}

/* 6. 证明 A：2 列（大视觉/示意图结合 2.webp + 列表或区域概览） */
.proof-a-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
}

.proof-visual-col {
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    border: 2px solid var(--c-border-subtle);
}

.proof-overview-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.proof-overview-item {
    background: #FFFFFF;
    border-radius: 18px;
    padding: 18px 22px;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--c-border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.proof-overview-item .region-title {
    font-size: 15px;
    font-weight: 800;
    color: var(--c-deep-blue);
    display: flex;
    align-items: center;
    gap: 10px;
}

.proof-overview-item .region-status {
    font-size: 13px;
    font-weight: 700;
    color: #10B981;
}

/* 7. 场景：Tab（4–6 个身份）+ 左痛点/右方案 */
.scene-tab-nav {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 24px;
    border-radius: 999px;
    font-size: 14.5px;
    font-weight: 700;
    background: #FFFFFF;
    color: var(--text-muted);
    border: 1px solid var(--c-border-subtle);
    box-shadow: var(--shadow-soft);
    transition: all 0.2s;
}

.tab-btn.active, .tab-btn:hover {
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(0, 82, 212, 0.35);
}

.scene-tab-pane {
    display: none;
    background: #FFFFFF;
    border-radius: 26px;
    padding: 36px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--c-border-subtle);
}

.scene-tab-pane.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.pain-col h4 {
    font-size: 18px;
    font-weight: 800;
    color: #DC2626;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.solution-col h4 {
    font-size: 18px;
    font-weight: 800;
    color: #10B981;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.pain-list, .solution-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
    font-size: 14px;
    color: var(--text-body);
}

.pain-list li::before {
    content: '✕ ';
    color: #DC2626;
    font-weight: 900;
}

.solution-list li::before {
    content: '✓ ';
    color: #10B981;
    font-weight: 900;
}

/* 8. 证明 B：普通状态 vs 使用后，3 组对比条 */
.compare-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.compare-card {
    background: #FFFFFF;
    border-radius: 22px;
    padding: 26px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--c-border-subtle);
}

.compare-title {
    font-size: 17px;
    font-weight: 800;
    color: var(--c-deep-blue);
    margin-bottom: 18px;
    text-align: center;
}

.bar-row {
    margin-bottom: 16px;
}

.bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 12.5px;
    font-weight: 700;
    margin-bottom: 6px;
}

.bar-track {
    height: 12px;
    background: #E2E8F0;
    border-radius: 999px;
    overflow: hidden;
    position: relative;
}

.bar-fill-before {
    height: 100%;
    background: #94A3B8;
    border-radius: 999px;
}

.bar-fill-after {
    height: 100%;
    background: linear-gradient(90deg, #0052D4, #00D2FF);
    border-radius: 999px;
}

/* 9. 定价：周期切换（月/季/年）+ 3 档套餐，中间档「最受欢迎」描边强调 (featured-plan) */
.pricing-cycle-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #E2E8F0;
    padding: 6px;
    border-radius: 999px;
    max-width: 320px;
    margin: 0 auto 40px;
}

.cycle-btn {
    padding: 8px 20px;
    border-radius: 999px;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--text-muted);
    transition: all 0.2s;
}

.cycle-btn.active {
    background: #FFFFFF;
    color: var(--c-ocean-blue);
    box-shadow: var(--shadow-soft);
}

.pricing-3-col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: stretch;
}

.pricing-card {
    background: #FFFFFF;
    border-radius: 26px;
    padding: 34px 26px;
    box-shadow: var(--shadow-card);
    border: 2px solid var(--c-border-subtle);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.25s;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.pricing-card.featured-plan {
    border: 2px solid #0052D4;
    box-shadow: 0 16px 36px rgba(0, 82, 212, 0.16);
    transform: scale(1.03);
    z-index: 2;
}

.pricing-card.featured-plan:hover {
    transform: scale(1.05) translateY(-5px);
}

.featured-pill-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    font-size: 11.5px;
    font-weight: 800;
    padding: 4px 16px;
    border-radius: 999px;
    box-shadow: 0 4px 12px rgba(0, 82, 212, 0.4);
    letter-spacing: 0.5px;
}

.plan-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--c-deep-blue);
    margin-bottom: 12px;
}

.plan-price-num {
    font-size: 38px;
    font-weight: 900;
    color: var(--c-ocean-blue);
    line-height: 1;
    margin-bottom: 6px;
}

.plan-price-num span {
    font-size: 13.5px;
    color: var(--text-muted);
    font-weight: 600;
}

.plan-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 22px;
}

.plan-features-list {
    list-style: none;
    margin-bottom: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    font-size: 13.5px;
    color: var(--text-body);
}

.plan-features-list li::before {
    content: '✓ ';
    color: #10B981;
    font-weight: 900;
}

.btn-plan-order {
    width: 100%;
    text-align: center;
    padding: 12px 0;
    border-radius: 999px;
    font-weight: 800;
    font-size: 14.5px;
    background: #EBF4FF;
    color: var(--c-ocean-blue);
    transition: all 0.2s;
}

.pricing-card.featured-plan .btn-plan-order {
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    box-shadow: 0 4px 14px rgba(0, 82, 212, 0.35);
}

.btn-plan-order:hover {
    background: #0052D4;
    color: #FFFFFF;
}

/* 10. 获取：3×2 下载/接入卡 + 移动端说明 */
.download-3x2-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.download-app-card {
    background: #FFFFFF;
    border-radius: 20px;
    padding: 22px 24px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--c-border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.25s;
}

.download-app-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: #00D2FF;
}

.app-card-meta {
    display: flex;
    align-items: center;
    gap: 14px;
}

.app-platform-icon {
    width: 44px;
    height: 44px;
    background: #F1F5F9;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.app-title-sys h4 {
    font-size: 16px;
    font-weight: 800;
    color: var(--c-deep-blue);
}

.app-title-sys p {
    font-size: 12px;
    color: var(--text-muted);
}

.btn-app-dl {
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    font-size: 12.5px;
    font-weight: 800;
    padding: 7px 16px;
    border-radius: 999px;
}

.mobile-dl-note-box {
    background: #FFFFFF;
    border-radius: 18px;
    padding: 20px 26px;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--c-border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13.5px;
    color: var(--text-body);
}

/* 11. 口碑：3 列引用卡 */
.reviews-3-col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.review-card-item {
    background: #FFFFFF;
    border-radius: 22px;
    padding: 28px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--c-border-subtle);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.review-quote-text {
    font-size: 14.5px;
    color: var(--text-body);
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

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

.author-avatar-badge {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 15px;
}

.author-meta h4 {
    font-size: 14.5px;
    font-weight: 800;
    color: var(--c-deep-blue);
}

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

/* 12. FAQ：分类手风琴，默认全部折叠 (含 id="install" 与 id="agent") */
.faq-accordion-wrap {
    max-width: 820px;
    margin: 0 auto;
}

.faq-cat-title {
    font-size: 18px;
    font-weight: 900;
    color: var(--c-deep-blue);
    margin: 28px 0 14px;
    padding-left: 10px;
    border-left: 4px solid var(--c-ocean-blue);
}

.faq-item-card {
    background: #FFFFFF;
    border-radius: 16px;
    margin-bottom: 12px;
    border: 1px solid var(--c-border-subtle);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
}

.faq-header-bar {
    padding: 18px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.faq-header-bar span {
    font-size: 15.5px;
    font-weight: 800;
    color: var(--c-deep-blue);
}

.faq-icon-toggle {
    font-size: 18px;
    color: var(--c-ocean-blue);
    font-weight: 900;
    transition: transform 0.25s;
}

.faq-answer-body {
    display: none;
    padding: 0 22px 18px;
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.8;
    border-top: 1px dashed var(--c-border-subtle);
    padding-top: 12px;
}

.faq-item-card.open .faq-answer-body {
    display: block;
}

.faq-item-card.open .faq-icon-toggle {
    transform: rotate(45deg);
}

/* 13. 收口：居中价值句 + 主 CTA + 次 CTA */
.cta-closing-section {
    background: linear-gradient(135deg, #0A192F 0%, #0D2149 100%);
    color: #FFFFFF;
    text-align: center;
    padding: 80px 20px;
    border-radius: 32px;
    margin: 40px auto 80px;
    max-width: 1140px;
    box-shadow: 0 20px 50px rgba(10, 25, 47, 0.4);
    position: relative;
    overflow: hidden;
}

.closing-title {
    font-size: 34px;
    font-weight: 900;
    margin-bottom: 16px;
    color: #FFFFFF;
}

.closing-title span {
    background: linear-gradient(90deg, #00D2FF, #38EF7D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.closing-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto 32px;
}

.closing-btn-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
}

/* 14. 页脚：品牌简介 + 4 组链接 + 合规/备案 */
footer {
    background: var(--c-deep-blue);
    color: #FFFFFF;
    padding: 72px 0 36px;
    border-top: 3px solid #00D2FF;
}

.footer-top-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
    gap: 36px;
    margin-bottom: 48px;
}

.footer-col h4 {
    font-size: 15.5px;
    font-weight: 800;
    color: #FFFFFF;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 8px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 3px;
    background: #00D2FF;
    border-radius: 999px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 11px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 13.5px;
}

.footer-col ul li a:hover {
    color: #00D2FF;
    padding-left: 4px;
}

.footer-bottom-row {
    padding-top: 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom-row a {
    color: rgba(255, 255, 255, 0.6);
    margin-left: 18px;
}

.footer-bottom-row a:hover {
    color: #00D2FF;
}

/* 15. 悬浮钮：右下固定两个圆角方块：主色客服、次要回顶 */
.fixed-floating-actions {
    position: fixed;
    right: 24px;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
}

.float-btn {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s;
}

.float-btn-primary {
    background: linear-gradient(135deg, #0052D4, #00D2FF);
    color: #FFFFFF;
    box-shadow: 0 6px 18px rgba(0, 82, 212, 0.4);
}

.float-btn-secondary {
    background: #FFFFFF;
    color: var(--c-deep-blue);
    border: 1px solid var(--c-border-subtle);
    font-size: 18px;
}

.float-btn:hover {
    transform: translateY(-3px) scale(1.05);
}

/* 响应式媒体查询 */
@media (max-width: 1140px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .trust-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .proof-a-grid {
        grid-template-columns: 1fr;
    }
    .pricing-3-col {
        grid-template-columns: 1fr;
    }
    .pricing-card.featured-plan {
        transform: none;
    }
    .footer-top-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    header {
        padding: 0 18px;
    }
    nav {
        position: fixed;
        top: 69px;
        left: 0;
        width: 100%;
        background: var(--c-hero-navy);
        padding: 24px 0;
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.4);
    }
    nav.nav-open {
        display: block;
    }
    nav .nav-links {
        flex-direction: column;
        gap: 18px;
        align-items: center;
    }
    .hamburger-btn {
        display: flex;
    }
    .grid-3-col, .compare-grid, .download-3x2-grid, .reviews-3-col {
        grid-template-columns: 1fr;
    }
    .scene-tab-pane.active {
        grid-template-columns: 1fr;
    }
    .hero-title {
        font-size: 30px;
    }
    .footer-top-grid {
        grid-template-columns: 1fr;
    }
    .closing-btn-row {
        flex-direction: column;
    }
}

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