/* ============================================
   SafeW – 安全加密通讯·双重密码
   企业级聊天软件 品牌官网样式
   ============================================ */

:root {
    --color-bg: #f7f2ee;
    --color-text-primary: #1a1a2e;
    --color-text-secondary: #52525b;
    --color-text-muted: #71717a;
    --color-white-glass: rgba(255, 255, 255, 0.55);
    --color-white-glass-bright: rgba(255, 255, 255, 0.75);
    --color-border-glass: rgba(255, 255, 255, 0.7);
    --color-purple: #a855f7;
    --color-indigo: #6366f1;
    --color-blue: #0ea5e9;
    --color-green: #10b981;
    --color-amber: #f59e0b;
    --gradient-primary: linear-gradient(135deg, #a855f7, #6366f1);
    --gradient-text: linear-gradient(120deg, #a855f7, #6366f1, #0ea5e9);
    --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 20px 36px rgba(0, 0, 0, 0.08);
    --radius-card: 22px;
    --radius-pill: 999px;
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* 背景动态光斑 */
body::before {
    content: "";
    position: fixed;
    top: -20%;
    left: -10%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle at 30% 40%, rgba(168, 85, 247, 0.2), transparent 55%);
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: "";
    position: fixed;
    bottom: -20%;
    right: -10%;
    width: 55%;
    height: 55%;
    background: radial-gradient(circle at 70% 60%, rgba(59, 130, 246, 0.15), transparent 55%);
    pointer-events: none;
    z-index: 0;
}

.orb {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(60px);
}

.orb-green {
    top: 20%;
    right: 5%;
    width: 300px;
    height: 300px;
    background: rgba(34, 197, 94, 0.12);
}

.orb-amber {
    bottom: 15%;
    left: 8%;
    width: 260px;
    height: 260px;
    background: rgba(245, 158, 11, 0.10);
}

.orb-purple {
    top: 55%;
    right: 20%;
    width: 180px;
    height: 180px;
    background: rgba(168, 85, 247, 0.10);
}

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

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* ========== 导航栏 ========== */
.site-header {
    position: sticky;
    top: 20px;
    z-index: 1000;
    display: flex;
    justify-content: center;
    padding: 0 16px;
}

.nav-glass {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    width: 100%;
    max-width: 1000px; /* 适配更多菜单项 */
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-pill);
    padding: 10px 22px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.logo {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 20px;
    font-weight: 800;
    color: var(--color-text-primary);
    flex-shrink: 0;
}

.logo-icon {
    width: 34px;
    height: 34px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    box-shadow: 0 4px 14px rgba(168, 85, 247, 0.3);
    color: white;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 4px;
    font-size: 13px;
    color: var(--color-text-secondary);
    flex-wrap: wrap;
    justify-content: center;
}

.main-nav li {
    display: flex;
}

.main-nav a {
    padding: 8px 12px;
    border-radius: var(--radius-pill);
    transition: var(--transition-smooth);
    font-weight: 500;
    white-space: nowrap;
}

.main-nav a:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.6);
}

.main-nav a.active {
    color: var(--color-indigo);
    background: rgba(255, 255, 255, 0.8);
    font-weight: 600;
}

.nav-actions {
    flex-shrink: 0;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-pill);
    font-weight: 600;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-small {
    padding: 9px 20px;
    font-size: 13px;
    background: var(--color-text-primary);
    color: #fff;
    white-space: nowrap;
}

.btn-small:hover {
    background: #2d2d44;
    transform: translateY(-1px);
}

.btn-primary {
    padding: 14px 30px;
    font-size: 15px;
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 10px 28px rgba(168, 85, 247, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(168, 85, 247, 0.4);
}

.btn-secondary {
    padding: 14px 26px;
    font-size: 15px;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.8);
    color: var(--color-text-primary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

/* ========== 首屏 ========== */
.hero {
    padding: 80px 0 60px;
    position: relative;
}

.hero-grid {
    display: flex;
    align-items: center;
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    text-align: left;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    font-size: 13px;
    color: var(--color-indigo);
    margin-bottom: 24px;
    letter-spacing: 0.3px;
    font-weight: 500;
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-green);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.7);
}

.hero-content h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.4rem);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -1.2px;
    margin-bottom: 20px;
    color: var(--color-text-primary);
}

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

.hero-desc {
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.9;
    margin-bottom: 30px;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 36px;
}

.hero-stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.hero-stat-item {
    text-align: left;
}

.hero-stat-item strong {
    display: block;
    font-size: 22px;
    font-weight: 800;
    color: var(--color-text-primary);
    letter-spacing: -0.5px;
}

.hero-stat-item span {
    font-size: 12px;
    color: var(--color-text-muted);
}

.hero-visual {
    flex: 0 0 300px;
    width: 300px;
}

.hero-visual img {
    width: 300px;
    object-fit: cover;
    border-radius: 28px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.4);
}

/* 替代图片的占位视觉 */
.hero-visual-placeholder {
    width: 300px;
    height: 340px;
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(255,255,255,0.8), rgba(255,255,255,0.3));
    border: 1px solid rgba(255,255,255,0.9);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.visual-lock-icon {
    font-size: 68px;
    line-height: 1;
    filter: drop-shadow(0 8px 16px rgba(168,85,247,0.3));
}

.visual-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-primary);
}

.visual-sub {
    font-size: 13px;
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
}

/* ========== 通用区块 ========== */
.section {
    padding: 60px 0;
    position: relative;
}

.section-heading {
    max-width: 650px;
    margin: 0 auto 40px;
    text-align: center;
}

.section-heading h2 {
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.section-heading p {
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.8;
}

/* ========== 双重密码流程创意版块 ========== */
.double-password-flow-section {
    background: rgba(255,255,255,0.2);
    border-radius: 40px;
    margin: 0 24px 40px;
    padding: 60px 0;
}

.password-flow-grid {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.password-step-card {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 28px;
    padding: 30px 24px;
    flex: 1 1 220px;
    max-width: 280px;
    position: relative;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.password-step-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-card-hover);
}

.step-number {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-indigo);
    background: rgba(255,255,255,0.8);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.step-icon {
    font-size: 42px;
    margin-bottom: 16px;
}

.password-step-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text-primary);
}

.password-step-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.step-tag {
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.7);
    font-size: 11px;
    font-weight: 600;
    color: var(--color-indigo);
    border: 1px solid rgba(255,255,255,0.9);
}

.password-flow-arrow {
    font-size: 28px;
    color: var(--color-indigo);
    align-self: center;
    opacity: 0.6;
    display: flex;
    align-items: center;
    padding: 0 4px;
}

.password-flow-note {
    text-align: center;
    margin-top: 36px;
    font-size: 14px;
    color: var(--color-text-secondary);
    background: rgba(255,255,255,0.4);
    border-radius: 50px;
    padding: 12px 24px;
    display: inline-block;
    border: 1px solid rgba(255,255,255,0.8);
    backdrop-filter: blur(12px);
}

/* ========== 密钥生命周期创意版块 ========== */
.key-lifecycle-section {
    padding: 80px 0;
}

.keycycle-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.keycycle-card {
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 28px 20px;
    transition: var(--transition-smooth);
    text-align: left;
}

.keycycle-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
    background: rgba(255, 255, 255, 0.45);
}

.keycycle-phase {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-indigo);
    text-transform: uppercase;
    margin-bottom: 12px;
    opacity: 0.8;
}

.keycycle-icon {
    font-size: 36px;
    margin-bottom: 14px;
}

.keycycle-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.keycycle-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========== 私有化部署架构创意版块 ========== */
.private-deploy-visual-section {
    background: rgba(255,255,255,0.2);
    border-radius: 40px;
    margin: 0 24px 40px;
    padding: 60px 0;
}

.deploy-architecture {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.deploy-layer {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 20px 24px;
    text-align: center;
}

.deploy-layer-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-indigo);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.deploy-items {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.deploy-item {
    background: rgba(255,255,255,0.6);
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 13px;
    color: var(--color-text-primary);
    border: 1px solid rgba(255,255,255,0.9);
    font-weight: 500;
}

.deploy-server-layer {
    background: rgba(255, 255, 255, 0.5);
    border: 2px solid rgba(168, 85, 247, 0.3);
}

.deploy-tag {
    margin-top: 14px;
    font-size: 12px;
    color: var(--color-indigo);
    font-weight: 600;
    background: rgba(255,255,255,0.5);
    display: inline-block;
    padding: 4px 16px;
    border-radius: 20px;
}

.deploy-connection {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.deploy-line {
    width: 2px;
    height: 30px;
    background: linear-gradient(to bottom, var(--color-indigo), transparent);
}

.deploy-security-badge {
    text-align: center;
    font-size: 14px;
    color: var(--color-indigo);
    font-weight: 600;
    background: rgba(255,255,255,0.5);
    border-radius: 50px;
    padding: 10px 20px;
    display: inline-block;
    margin: 8px auto 0;
    border: 1px solid rgba(255,255,255,0.8);
}

/* ========== 企业场景矩阵 ========== */
.enterprise-scenarios-section {
    padding: 80px 0;
}

.scenario-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.scenario-card {
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 28px 22px;
    transition: var(--transition-smooth);
}

.scenario-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
    background: rgba(255, 255, 255, 0.45);
}

.scenario-icon {
    font-size: 38px;
    margin-bottom: 16px;
}

.scenario-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text-primary);
}

.scenario-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.scenario-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    background: rgba(255,255,255,0.7);
    font-size: 11px;
    font-weight: 600;
    color: var(--color-indigo);
    border: 1px solid rgba(255,255,255,0.9);
}

/* ========== 安全知识库预览 ========== */
.knowledge-preview-section {
    background: rgba(255,255,255,0.15);
    border-radius: 40px;
    margin: 0 24px 40px;
    padding: 60px 0;
}

.knowledge-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.knowledge-preview-card {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 26px 22px;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.knowledge-preview-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
    background: rgba(255, 255, 255, 0.55);
}

.knowledge-preview-tag {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-purple);
    margin-bottom: 12px;
}

.knowledge-preview-card h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 10px;
    color: var(--color-text-primary);
}

.knowledge-preview-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 18px;
    flex: 1;
}

.knowledge-read-more {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-indigo);
    transition: color 0.2s;
}

.knowledge-read-more:hover {
    color: var(--color-purple);
}

/* ========== 问答专区预览 ========== */
.faq-preview-section {
    padding: 80px 0;
}

.faq-preview-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 800px;
    margin: 0 auto 30px;
}

.faq-preview-item {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px;
    padding: 20px 24px;
    transition: var(--transition-smooth);
}

.faq-preview-item:hover {
    background: rgba(255, 255, 255, 0.55);
    box-shadow: var(--shadow-card);
}

.faq-preview-q {
    font-weight: 700;
    font-size: 15px;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.faq-preview-a {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.faq-preview-cta {
    text-align: center;
}

/* ========== 安全统计 ========== */
.security-section {
    padding: 80px 0;
    text-align: center;
}

.security-section .section-heading {
    margin-bottom: 36px;
}

.security-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
}

.security-card {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 22px;
    padding: 26px 24px;
    flex: 1 1 200px;
    max-width: 250px;
    text-align: center;
    transition: var(--transition-smooth);
}

.security-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.stat-number {
    font-size: 32px;
    font-weight: 900;
    color: var(--color-text-primary);
    letter-spacing: -1px;
    margin-bottom: 8px;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-indigo);
    margin-bottom: 4px;
}

.stat-sub {
    font-size: 11px;
    color: var(--color-text-muted);
}

/* ========== 下载区块 ========== */
.download-section {
    padding: 90px 0;
    text-align: center;
}

.download-section h2 {
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 14px;
    color: var(--color-text-primary);
}

.download-section .sub {
    color: var(--color-text-secondary);
    font-size: 15px;
    max-width: 550px;
    margin: 0 auto 36px;
}

.platform-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
}

.platform-badge {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 50%;
    width: 90px;
    height: 90px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.platform-badge:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 28px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.6);
}

.platform-badge svg {
    width: 28px;
    height: 28px;
    fill: var(--color-text-primary);
}

.platform-badge span {
    font-size: 11px;
    color: var(--color-text-secondary);
    font-weight: 600;
}

/* ========== 用户证言 ========== */
.testimonials-section {
    padding: 80px 0 100px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.testimonial-card {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 22px;
    padding: 24px 22px;
    transition: var(--transition-smooth);
}

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

.testimonial-card:nth-child(2) {
    transform: translateY(20px);
}

.testimonial-card:nth-child(2):hover {
    transform: translateY(15px);
}

.testimonial-quote {
    font-size: 38px;
    line-height: 1;
    color: var(--color-purple);
    opacity: 0.5;
    margin-bottom: 10px;
    font-family: Georgia, serif;
}

.testimonial-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 18px;
}

.testimonial-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.testimonial-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: #fff;
    flex-shrink: 0;
}

.testimonial-name {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.4;
}

/* ========== 最终CTA ========== */
.final-cta {
    padding: 70px 0;
    text-align: center;
    max-width: 850px;
    margin: 0 auto 90px;
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 36px;
}

.final-cta h2 {
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

.final-cta p {
    color: var(--color-text-secondary);
    margin-bottom: 28px;
}

.final-cta .btn {
    margin: 0 6px;
}

/* ========== 页脚 ========== */
.site-footer {
    padding: 50px 0 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    position: relative;
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto 40px;
    text-align: left;
}

.footer-brand .logo {
    margin-bottom: 16px;
    justify-content: flex-start;
}

.footer-brand p {
    font-size: 13px;
    color: var(--color-text-secondary);
    max-width: 260px;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul li a {
    font-size: 13px;
    color: var(--color-text-secondary);
    transition: color 0.2s;
}

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

.footer-newsletter {
    max-width: 1000px;
    margin: 0 auto 30px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 16px;
    padding: 18px 22px;
}

.footer-newsletter span {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.newsletter-form {
    display: flex;
    gap: 10px;
    flex: 1;
    min-width: 250px;
}

.newsletter-form input {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(255, 255, 255, 0.8);
    background: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    color: var(--color-text-primary);
    outline: none;
}

.newsletter-form input::placeholder {
    color: #a1a1aa;
}

.newsletter-form button {
    padding: 10px 20px;
    border-radius: var(--radius-pill);
    border: none;
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: opacity 0.2s;
    white-space: nowrap;
}

.newsletter-form button:hover {
    opacity: 0.9;
}

.footer-bottom {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: #a1a1aa;
}

.footer-social {
    display: flex;
    gap: 14px;
}

.footer-social a {
    color: var(--color-text-secondary);
    transition: color 0.2s;
    font-size: 13px;
}

.footer-social a:hover {
    color: var(--color-text-primary);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .nav-glass {
        max-width: 100%;
        padding: 10px 18px;
    }
    .main-nav a {
        padding: 8px 10px;
        font-size: 12px;
    }
    .keycycle-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .scenario-grid,
    .knowledge-preview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none; /* 移动端可改为汉堡菜单，此处简单隐藏 */
    }
    .nav-glass {
        justify-content: space-between;
    }
    .hero-grid {
        flex-direction: column;
        text-align: center;
    }
    .hero-content {
        text-align: center;
    }
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions {
        justify-content: center;
    }
    .hero-stats-row {
        justify-content: center;
    }
    .hero-visual {
        flex: 0 0 auto;
        width: 260px;
    }
    .hero-visual-placeholder {
        width: 260px;
        height: 300px;
        margin: 0 auto;
    }
    .password-flow-grid {
        flex-direction: column;
        align-items: center;
    }
    .password-flow-arrow {
        transform: rotate(90deg);
    }
    .keycycle-grid {
        grid-template-columns: 1fr;
    }
    .scenario-grid,
    .knowledge-preview-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    .testimonial-card:nth-child(2) {
        transform: none;
    }
    .testimonial-card:nth-child(2):hover {
        transform: translateY(-5px);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    .deploy-items {
        gap: 6px;
    }
    .deploy-item {
        padding: 6px 12px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .nav-glass {
        flex-wrap: wrap;
        gap: 8px;
        border-radius: 24px;
        padding: 12px 16px;
    }
    .hero {
        padding: 50px 0 40px;
    }
    .hero-visual {
        width: 220px;
    }
    .hero-visual-placeholder {
        width: 220px;
        height: 250px;
    }
    .visual-lock-icon {
        font-size: 56px;
    }
    .section {
        padding: 40px 0;
    }
    .double-password-flow-section,
    .private-deploy-visual-section,
    .knowledge-preview-section {
        margin: 0 12px 30px;
        padding: 40px 16px;
    }
    .security-cards {
        flex-direction: column;
        align-items: center;
    }
    .security-card {
        max-width: 100%;
        width: 100%;
    }
    .platform-badge {
        width: 76px;
        height: 76px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-brand .logo {
        justify-content: center;
    }
    .footer-newsletter {
        flex-direction: column;
        text-align: center;
    }
    .newsletter-form {
        width: 100%;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}