/* ============================================
   LaoChenDNS V2.0 官网样式
   设计理念: Dieter Rams 极简秩序 + Braun 设计美学
   ============================================ */

/* CSS Variables - Design Tokens (匹配 Desktop 应用主题) */
:root {
    /* Swiss International Style / Braun Inspired Palette */
    --color-bg: #F4F4F0;           /* 暖灰背景 Warm Gray / Paper */
    --color-surface: #FFFFFF;       /* 纯白卡片 */
    --color-surface-elevated: #FAFAF8;
    
    --color-text: #111111;          /* 近黑文字 */
    --color-text-secondary: #666666;
    --color-text-muted: #888888;
    
    --color-primary: #EA580C;       /* Braun Orange 主色 */
    --color-primary-hover: #C2410C;
    --color-primary-light: #FFF7ED;
    
    --color-accent: #000000;        /* 深黑强调 */
    --color-accent-secondary: #EA580C;
    
    --color-border: #E5E5E5;
    --color-border-light: #F0F0F0;
    
    /* Functional Colors */
    --color-success: #16A34A;
    --color-success-bg: #DCFCE7;
    --color-warning: #CA8A04;
    --color-warning-bg: #FEF9C3;
    --color-info: #2563EB;
    --color-info-bg: #DBEAFE;
    
    /* Typography */
    --font-sans: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing - 8px grid */
    --space-1: 0.5rem;   /* 8px */
    --space-2: 1rem;     /* 16px */
    --space-3: 1.5rem;   /* 24px */
    --space-4: 2rem;     /* 32px */
    --space-6: 3rem;     /* 48px */
    --space-8: 4rem;     /* 64px */
    --space-12: 6rem;    /* 96px */
    --space-16: 8rem;    /* 128px */
    
    /* Border radius - 极简圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows - 极柔和的弥散阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.08);
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-base: 200ms ease-out;
    --transition-slow: 300ms ease-out;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: var(--space-3);
}

/* Dark Mode - Dark Matte */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0F0F0F;
        --color-surface: #1A1A1A;
        --color-surface-elevated: #242424;
        
        --color-text: #F0F0F0;
        --color-text-secondary: #A0A0A0;
        --color-text-muted: #666666;
        
        --color-primary: #F97316;
        --color-primary-hover: #FB923C;
        --color-primary-light: #2A1A0F;
        
        --color-accent: #FFFFFF;
        --color-border: #2A2A2A;
        --color-border-light: #333333;
        
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    }
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

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

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

ul {
    list-style: none;
}

/* Selection */
::selection {
    background: var(--color-primary);
    color: white;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Utility Classes */
.text-accent {
    color: var(--color-primary);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, #F97316 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(244, 244, 240, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

@media (prefers-color-scheme: dark) {
    .nav {
        background: rgba(15, 15, 15, 0.85);
    }
}

.nav.scrolled {
    border-color: var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
}

.logo-icon-img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-link {
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.nav-link:hover {
    color: var(--color-text);
    background: rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
    .nav-link:hover {
        background: rgba(255, 255, 255, 0.06);
    }
}

.nav-link-primary {
    background: var(--color-primary);
    color: white;
}

.nav-link-primary:hover {
    background: var(--color-primary-hover);
    color: white;
}

.nav-toggle {
    display: none;
    padding: var(--space-1);
    color: var(--color-text);
}

.nav-toggle i {
    width: 24px;
    height: 24px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 64px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.hero-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.hero-shape-1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, #EA580C20, #F9731620);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.hero-shape-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #F9731620, #EA580C20);
    bottom: -100px;
    left: 10%;
    opacity: 0.3;
    animation-delay: -7s;
}

.hero-shape-3 {
    width: 300px;
    height: 300px;
    background: rgba(17, 17, 17, 0.05);
    top: 40%;
    right: 20%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 64px 64px;
    opacity: 0.4;
    mask-image: linear-gradient(to bottom, transparent, black 20%, black 80%, transparent);
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: center;
    padding: var(--space-4) 0 var(--space-6);
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

.tag-indicator {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-4);
}

.title-line {
    display: block;
}

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

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 480px;
    margin-bottom: var(--space-4);
}

.hero-actions {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.btn i {
    width: 18px;
    height: 18px;
}

.btn-lg {
    padding: var(--space-2) var(--space-4);
    font-size: 1rem;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(234, 88, 12, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    background: rgba(0, 0, 0, 0.03);
    border-color: var(--color-text-secondary);
}

@media (prefers-color-scheme: dark) {
    .btn-ghost:hover {
        background: rgba(255, 255, 255, 0.05);
    }
}

/* Hero Badges */
.hero-badges {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.hero-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.hero-badge i {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
}

/* Hero Visual */
.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-graphic {
    position: relative;
    width: 360px;
    height: 360px;
}

.graphic-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.graphic-ring-outer {
    width: 360px;
    height: 360px;
    border-style: dashed;
    border-color: var(--color-primary);
    opacity: 0.3;
    animation: rotate 60s linear infinite;
}

.graphic-ring-middle {
    width: 250px;
    height: 250px;
    border-color: var(--color-border);
    animation: rotate 40s linear infinite reverse;
}

.graphic-ring-inner {
    width: 140px;
    height: 140px;
    border-color: var(--color-primary);
    border-width: 3px;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.graphic-nodes {
    position: absolute;
    inset: 0;
}

.node {
    position: absolute;
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--color-border);
    animation: nodeFloat 4s ease-in-out infinite;
}

.node i {
    width: 20px;
    height: 20px;
}

.node-cf {
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    color: var(--color-primary);
    animation-delay: 0s;
}

.node-center {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    padding: 0;
    justify-content: center;
    background: var(--color-primary);
    color: white;
    border: none;
    animation: none;
}

.node-center i {
    width: 28px;
    height: 28px;
}

.node-dp {
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    color: var(--color-text);
    animation-delay: -2s;
}

@keyframes nodeFloat {
    0%, 100% { transform: translateY(-50%) translateX(0); }
    50% { transform: translateY(-50%) translateX(8px); }
}

.graphic-lines {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 300px;
    pointer-events: none;
}

.graphic-line {
    stroke: var(--color-primary);
    stroke-width: 2;
    stroke-dasharray: 8 4;
    opacity: 0.4;
    animation: dash 2s linear infinite;
}

@keyframes dash {
    to { stroke-dashoffset: -24; }
}

/* Hero Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    color: var(--color-text-muted);
    font-size: 0.75rem;
}

.scroll-mouse {
    width: 24px;
    height: 36px;
    border: 2px solid var(--color-border);
    border-radius: 12px;
    position: relative;
}

.scroll-wheel {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 6px;
    background: var(--color-text-muted);
    border-radius: 2px;
    animation: scrollWheel 2s ease-in-out infinite;
}

@keyframes scrollWheel {
    0%, 100% { opacity: 1; top: 6px; }
    50% { opacity: 0.3; top: 14px; }
}

.scroll-text {
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ============================================
   Section Base
   ============================================ */
.section {
    padding: var(--space-16) 0;
    position: relative;
}

.section-header {
    margin-bottom: var(--space-8);
}

.section-header-center {
    text-align: center;
}

.section-header-center .section-desc {
    max-width: 600px;
    margin: var(--space-3) auto 0;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.section-title {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   Pain Points Section
   ============================================ */
.section-painpoints {
    background: var(--color-surface-elevated);
}

.painpoints-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.painpoint-card {
    background: var(--color-surface);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.painpoint-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
    border-opacity: 0.3;
}

.painpoint-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-3);
}

.painpoint-icon i {
    width: 24px;
    height: 24px;
}

.painpoint-icon-1 { background: var(--color-primary-light); color: var(--color-primary); }
.painpoint-icon-2 { background: rgba(0, 0, 0, 0.05); color: var(--color-text); }
.painpoint-icon-3 { background: rgba(0, 0, 0, 0.05); color: var(--color-text-secondary); }
.painpoint-icon-4 { background: var(--color-primary-light); color: var(--color-primary-hover); }

@media (prefers-color-scheme: dark) {
    .painpoint-icon-2, .painpoint-icon-3 {
        background: rgba(255, 255, 255, 0.05);
    }
}

.painpoint-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.painpoint-desc {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   Features Section
   ============================================ */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: center;
    margin-bottom: var(--space-12);
}

.feature-block:last-child {
    margin-bottom: 0;
}

.feature-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.feature-tag-ai {
    background: var(--color-primary);
    color: white;
}

.feature-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.feature-desc {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-4);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.9375rem;
    color: var(--color-text);
}

.feature-list i {
    width: 18px;
    height: 18px;
    color: var(--color-primary);
}

/* Feature Mockups */
.feature-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-mockup {
    width: 100%;
    max-width: 400px;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.mockup-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    background: var(--color-surface-elevated);
    border-bottom: 1px solid var(--color-border);
}

.mockup-dots {
    display: flex;
    gap: 6px;
}

.mockup-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-border);
}

.mockup-dots span:first-child { background: var(--color-text); }
.mockup-dots span:nth-child(2) { background: var(--color-text-secondary); }
.mockup-dots span:last-child { background: var(--color-primary); }

.mockup-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mockup-content {
    padding: var(--space-3);
}

.mockup-provider {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2);
    border: 1px solid var(--color-border);
}

.mockup-provider:last-child {
    margin-bottom: 0;
}

.mockup-provider-active {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.provider-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.provider-icon i {
    width: 20px;
    height: 20px;
}

.provider-cf { background: var(--color-primary-light); color: var(--color-primary); }
.provider-dp { background: rgba(0, 0, 0, 0.05); color: var(--color-text); }

@media (prefers-color-scheme: dark) {
    .provider-dp { background: rgba(255, 255, 255, 0.05); color: var(--color-text); }
}

.provider-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.provider-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.provider-status {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.provider-check {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.mockup-domain {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.mockup-domain:last-child {
    border-bottom: none;
}

.domain-name {
    flex: 1;
    font-weight: 500;
    font-size: 0.9375rem;
}

.domain-badge {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
}

.domain-badge-cf { background: var(--color-primary-light); color: var(--color-primary); }
.domain-badge-dp { background: rgba(0, 0, 0, 0.05); color: var(--color-text); }

@media (prefers-color-scheme: dark) {
    .domain-badge-dp { background: rgba(255, 255, 255, 0.05); color: var(--color-text); }
}

.domain-count {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.mockup-record {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.mockup-record:last-child {
    border-bottom: none;
}

.record-type {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.625rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.record-type-a { background: var(--color-primary-light); color: var(--color-primary); }
.record-type-cname { background: rgba(0, 0, 0, 0.05); color: var(--color-text); }
.record-type-txt { background: rgba(0, 0, 0, 0.05); color: var(--color-text-secondary); }

@media (prefers-color-scheme: dark) {
    .record-type-cname, .record-type-txt {
        background: rgba(255, 255, 255, 0.05);
    }
}

.record-name {
    width: 60px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.record-value {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Smart Domain Detection Mockup */
.mockup-smart-input {
    padding: var(--space-3);
}

.smart-input-box {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    margin-bottom: var(--space-3);
    transition: all var(--transition-base);
}

.smart-input-box:focus-within {
    border-color: var(--color-primary);
}

.smart-input-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.smart-input-value {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-text);
}

.smart-input-value .highlight {
    color: var(--color-primary);
    font-weight: 600;
}

.smart-detection-result {
    background: var(--color-primary-light);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.detection-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
}

.detection-header i {
    width: 18px;
    height: 18px;
}

.detection-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.detection-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
}

.detection-label {
    color: var(--color-text-muted);
    width: 60px;
}

.detection-value {
    font-family: var(--font-mono);
    color: var(--color-text);
}

.detection-value.badge {
    background: var(--color-primary);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
}

/* ============================================
   Providers Section
   ============================================ */
.section-providers {
    background: var(--color-surface);
}

.providers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.provider-card {
    background: var(--color-surface-elevated);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-base);
}

.provider-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.provider-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-3);
}

.provider-card-icon i {
    width: 28px;
    height: 28px;
}

.provider-cf { background: #F6821F20; color: #F6821F; }
.provider-tencent { background: #00A3FF20; color: #00A3FF; }
.provider-aliyun { background: #FF6A0020; color: #FF6A00; }
.provider-huawei { background: #FF000020; color: #FF0000; }
.provider-baidu { background: #2932E120; color: #2932E1; }
.provider-dnscom { background: #00C85320; color: #00C853; }
.provider-tencent-cloud { background: #0052D920; color: #0052D9; }
.provider-rainyun { background: #4A90D920; color: #4A90D9; }

.provider-card-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: var(--color-text);
}

.provider-card-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

@media (max-width: 1024px) {
    .providers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .providers-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Security Section
   ============================================ */
.section-security {
    background: var(--color-accent);
    color: white;
}

.section-security .section-title,
.section-security .section-tag {
    color: white;
}

.section-security .text-accent {
    color: var(--color-primary);
}

.security-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: center;
}

.security-lead {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

.security-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.security-feature {
    display: flex;
    gap: var(--space-3);
}

.security-icon {
    width: 48px;
    height: 48px;
    background: rgba(234, 88, 12, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.security-icon i {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.security-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.security-info p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

/* Security Visual */
.security-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.security-lock {
    position: relative;
    width: 280px;
    height: 280px;
}

.lock-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.lock-ring-1 {
    width: 280px;
    height: 280px;
    border-color: rgba(234, 88, 12, 0.3);
    animation: pulseRing 3s ease-in-out infinite;
}

.lock-ring-2 {
    width: 200px;
    height: 200px;
    border-color: rgba(234, 88, 12, 0.5);
    animation: pulseRing 3s ease-in-out infinite 0.5s;
}

@keyframes pulseRing {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.7; }
}

.lock-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background: var(--color-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 60px rgba(234, 88, 12, 0.5);
}

.lock-core i {
    width: 48px;
    height: 48px;
}

/* ============================================
   Testimonials Section
   ============================================ */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.testimonial-card {
    background: var(--color-surface);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    position: relative;
    transition: all var(--transition-base);
}

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

.testimonial-quote {
    width: 40px;
    height: 40px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-3);
}

.testimonial-quote i {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.testimonial-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.testimonial-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.testimonial-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.testimonial-role {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ============================================
   FAQ Section
   ============================================ */
.section-faq {
    background: var(--color-surface-elevated);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.faq-item {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    color: var(--color-text);
    transition: background var(--transition-base);
}

.faq-question:hover {
    background: var(--color-surface-elevated);
}

.faq-icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 var(--space-4) var(--space-4);
}

.faq-answer p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   Download Section
   ============================================ */
.section-download {
    padding-bottom: var(--space-16);
}

.download-card {
    background: var(--color-accent);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-8);
    align-items: center;
    position: relative;
    overflow: hidden;
}

.download-content {
    position: relative;
    z-index: 1;
}

.download-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-3);
    line-height: 1.3;
}

.download-desc {
    font-size: 1.0625rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-6);
    max-width: 480px;
}

.download-platforms {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    background: white;
    color: var(--color-accent);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.download-btn i {
    width: 24px;
    height: 24px;
}

.download-btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.download-btn-label {
    font-size: 0.9375rem;
    font-weight: 600;
}

.download-btn-version {
    font-size: 0.75rem;
    opacity: 0.7;
}

.download-coming {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.download-coming i {
    width: 18px;
    height: 18px;
}

.download-links {
    display: flex;
    gap: var(--space-4);
}

.download-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

.download-link:hover {
    color: white;
}

.download-link i {
    width: 16px;
    height: 16px;
}

.download-graphic {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-circle {
    position: absolute;
    inset: 0;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    animation: rotate 30s linear infinite;
}

.download-circle::before {
    content: '';
    position: absolute;
    inset: 20px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    animation: rotate 20s linear infinite reverse;
}

.download-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-icon i {
    width: 40px;
    height: 40px;
    color: white;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-accent);
    color: white;
    padding: var(--space-8) 0 var(--space-4);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: var(--space-3);
}

.footer-logo .logo-icon-img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9375rem;
    margin-bottom: var(--space-4);
}

.footer-social {
    display: flex;
    gap: var(--space-2);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

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

.footer-social i {
    width: 20px;
    height: 20px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
    color: rgba(255, 255, 255, 0.7);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-col a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9375rem;
    transition: color var(--transition-base);
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-4);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.875rem;
}

/* ============================================
   Scroll Reveal Animation
   ============================================ */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation delays */
[data-reveal]:nth-child(1) { transition-delay: 0ms; }
[data-reveal]:nth-child(2) { transition-delay: 100ms; }
[data-reveal]:nth-child(3) { transition-delay: 200ms; }
[data-reveal]:nth-child(4) { transition-delay: 300ms; }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-6);
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-badges {
        justify-content: center;
    }
    
    .hero-graphic {
        width: 300px;
        height: 300px;
    }
    
    .graphic-ring-outer {
        width: 300px;
        height: 300px;
    }
    
    .graphic-ring-middle {
        width: 210px;
        height: 210px;
    }
    
    .graphic-ring-inner {
        width: 120px;
        height: 120px;
    }
    
    .feature-block {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .feature-block-left .feature-visual {
        order: -1;
    }
    
    .security-layout {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .security-visual {
        order: -1;
    }
    
    .download-card {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-platforms {
        justify-content: center;
    }
    
    .download-links {
        justify-content: center;
    }
    
    .download-graphic {
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: var(--space-2);
    }
    
    .section {
        padding: var(--space-12) 0;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: var(--space-2);
        border-bottom: 1px solid var(--color-border);
        gap: 0;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--space-2) var(--space-3);
    }
    
    .nav-toggle {
        display: block;
    }
    
    .painpoints-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn-lg {
        width: 100%;
    }
    
    .hero-badges {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .painpoints-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-title {
        font-size: 1.5rem;
    }
    
    .download-platforms {
        flex-direction: column;
        width: 100%;
    }
    
    .download-btn {
        width: 100%;
        justify-content: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Scroll Reveal Animation
   ============================================ */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation delays */
[data-reveal]:nth-child(1) { transition-delay: 0ms; }
[data-reveal]:nth-child(2) { transition-delay: 100ms; }
[data-reveal]:nth-child(3) { transition-delay: 200ms; }
[data-reveal]:nth-child(4) { transition-delay: 300ms; }

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .nav,
    .hero-scroll,
    .hero-graphic,
    .security-visual,
    .download-graphic {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: var(--space-4) 0;
    }
    
    .section {
        padding: var(--space-4) 0;
    }
}