/* ================================
   小青橙科技官网 V3 — 日/夜双主题
   鸿蒙光效 + 毛玻璃风格
   ================================ */

/* ===== 夜间主题（默认） ===== */
:root,
:root[data-theme="dark"] {
    --green-1: #5BAE7A;
    --green-deep: #3D8B5C;
    --orange-1: #FF9B5A;
    --orange-deep: #E87B3A;

    --bg-base: #0a0c14;
    --bg-radial: radial-gradient(ellipse at 50% 0%, #121524 0%, #0a0c14 60%);

    --text-primary: #e8eaf0;
    --text-secondary: rgba(255, 255, 255, .55);
    --text-muted: rgba(255, 255, 255, .4);
    --text-faint: rgba(255, 255, 255, .2);

    --glass-bg: rgba(255, 255, 255, .07);
    --glass-bg-hover: rgba(255, 255, 255, .12);
    --glass-border: rgba(255, 255, 255, .15);
    --glass-border-bright: rgba(255, 255, 255, .25);
    --glass-highlight: rgba(255, 255, 255, .3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, .35), inset 0 1px 1px rgba(255, 255, 255, .08);
    --glass-shadow-hover: 0 16px 48px rgba(0, 0, 0, .4), inset 0 1px 1px rgba(255, 255, 255, .12);

    --aurora-1-opacity: .5;
    --aurora-2-opacity: .5;
    --aurora-3-opacity: .35;
    --grid-opacity: .02;

    --topbar-bg: rgba(10, 12, 20, .55);
    --footer-bg: rgba(0, 0, 0, .35);

    --section-title-grad: linear-gradient(135deg, #ffffff 0%, #c8cde0 100%);
    --hero-line-grad: linear-gradient(135deg, #ffffff 0%, #5BAE7A 50%, #FF9B5A 100%);

    --tag-dot-color: rgba(255, 255, 255, .2);
    --dot-active-bg: rgba(91, 174, 122, .3);

    --cloud-badge-bg: rgba(255, 255, 255, .08);

    --contact-icon-bg: linear-gradient(135deg, rgba(91,174,122,.15), rgba(255,155,90,.15));
    --contact-icon-border: rgba(91,174,122,.2);
}

/* ===== 日间主题 ===== */
:root[data-theme="light"] {
    --green-1: #3D8B5C;
    --green-deep: #2E6B47;
    --orange-1: #E87B3A;
    --orange-deep: #D0652A;

    --bg-base: #F5F1EB;
    --bg-radial: radial-gradient(ellipse at 50% 0%, #FAF7F2 0%, #F0EAE0 60%);

    --text-primary: #2A2D3E;
    --text-secondary: #5A5E6E;
    --text-muted: #8A8FA3;
    --text-faint: rgba(42, 45, 62, .15);

    --glass-bg: rgba(255, 255, 255, .55);
    --glass-bg-hover: rgba(255, 255, 255, .75);
    --glass-border: rgba(255, 255, 255, .6);
    --glass-border-bright: rgba(255, 255, 255, .8);
    --glass-highlight: rgba(255, 255, 255, .5);
    --glass-shadow: 0 8px 32px rgba(91, 110, 80, .12), inset 0 1px 1px rgba(255, 255, 255, .5);
    --glass-shadow-hover: 0 16px 48px rgba(91, 110, 80, .18), inset 0 1px 1px rgba(255, 255, 255, .6);

    --aurora-1-opacity: .25;
    --aurora-2-opacity: .22;
    --aurora-3-opacity: .18;
    --grid-opacity: .03;

    --topbar-bg: rgba(250, 247, 242, .65);
    --footer-bg: rgba(240, 234, 224, .5);

    --section-title-grad: linear-gradient(135deg, #2A2D3E 0%, #3D8B5C 100%);
    --hero-line-grad: linear-gradient(135deg, #2A2D3E 0%, #3D8B5C 40%, #E87B3A 100%);

    --tag-dot-bg: rgba(61, 139, 92, .15);
    --dot-active-bg: rgba(61, 139, 92, .2);

    --cloud-badge-bg: rgba(255, 255, 255, .5);

    --contact-icon-bg: linear-gradient(135deg, rgba(61,139,92,.12), rgba(232,123,58,.12));
    --contact-icon-border: rgba(61,139,92,.2);
}

/* ===== 通用变量（两主题共享） ===== */
:root {
    --green-grad: #5BAE7A;
    --orange-grad: #FF9B5A;
    --glass-blur: 24px;
    --glass-blur-strong: 40px;
    --glass-saturate: 1.8;
    --radius: 20px;
    --max-w: 1200px;
    --grad-main: linear-gradient(135deg, #5BAE7A, #FF9B5A);
    --grad-soft: linear-gradient(135deg, rgba(91,174,122,.2), rgba(255,155,90,.2));
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background .6s ease, color .6s ease;
}

/* ================================
   鸿蒙流光背景
   ================================ */
.hm-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    background: var(--bg-radial);
    transition: background .6s ease;
}
.hm-aurora {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    animation: aurora-drift 20s ease-in-out infinite;
    transition: opacity .6s ease;
}
.hm-aurora-1 {
    width: 600px; height: 600px;
    top: -200px; left: -100px;
    background: radial-gradient(circle, #5BAE7A, transparent 70%);
    opacity: var(--aurora-1-opacity);
}
.hm-aurora-2 {
    width: 500px; height: 500px;
    top: 30%; right: -150px;
    background: radial-gradient(circle, #FF9B5A, transparent 70%);
    animation-delay: -7s;
    opacity: var(--aurora-2-opacity);
}
.hm-aurora-3 {
    width: 700px; height: 400px;
    bottom: -100px; left: 30%;
    background: radial-gradient(circle, #4A8EDA, transparent 70%);
    animation-delay: -14s;
    opacity: var(--aurora-3-opacity);
}
@keyframes aurora-drift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(60px, -40px) scale(1.1); }
    66% { transform: translate(-40px, 50px) scale(.95); }
}

.hm-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(128,128,128,var(--grid-opacity)) 1px, transparent 1px),
        linear-gradient(90deg, rgba(128,128,128,var(--grid-opacity)) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at 50% 50%, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 30%, transparent 80%);
}

/* 磨砂颗粒纹理叠加层 */
.hm-noise {
    position: absolute;
    inset: 0;
    opacity: .03;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    pointer-events: none;
}

/* ================================
   滚动进度光带
   ================================ */
.scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    width: 0%;
    background: var(--grad-main);
    z-index: 9999;
    box-shadow: 0 0 12px rgba(91, 174, 122, .6);
    transition: width .1s ease;
}

/* ================================
   侧边导航点
   ================================ */
.dot-nav {
    position: fixed;
    right: 32px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 6000;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 16px 10px;
    border-radius: 100px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(1.5);
    -webkit-backdrop-filter: blur(16px) saturate(1.5);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}
.dot {
    position: relative;
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--text-faint);
    transition: all .3s ease;
    cursor: pointer;
    text-decoration: none;
}
.dot span {
    position: absolute;
    inset: 2px;
    border-radius: 50%;
    background: transparent;
    transition: all .3s ease;
}
.dot.active {
    background: var(--dot-active-bg);
    box-shadow: 0 0 12px rgba(91, 174, 122, .5);
}
.dot.active span {
    background: var(--grad-main);
    box-shadow: 0 0 8px rgba(91, 174, 122, .8);
}
.dot:hover { background: var(--text-muted); }
.dot::after {
    content: attr(data-label);
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    color: var(--text-primary);
    white-space: nowrap;
    opacity: 0;
    transition: opacity .3s ease;
    pointer-events: none;
}
.dot:hover::after { opacity: 1; }

/* ================================
   顶部导航栏
   ================================ */
.top-bar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 7000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 48px;
    transition: all .4s ease;
}
.top-bar.scrolled {
    background: var(--topbar-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, .08), inset 0 1px 0 var(--glass-highlight);
    padding: 14px 48px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
}
.logo-halo {
    position: absolute;
    left: -8px; top: -8px;
    width: 52px; height: 52px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(91,174,122,.3), transparent 70%);
    filter: blur(8px);
    animation: halo-pulse 3s ease-in-out infinite;
}
@keyframes halo-pulse {
    0%, 100% { opacity: .5; transform: scale(1); }
    50% { opacity: .8; transform: scale(1.15); }
}
.logo-icon {
    width: 36px; height: 36px;
    filter: drop-shadow(0 2px 8px rgba(91, 174, 122, .4));
    position: relative;
    z-index: 1;
}
.logo-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: .5px;
}
.top-right {
    display: flex;
    align-items: center;
    gap: 20px;
}
.top-contact {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
    font-family: 'Space Grotesk', sans-serif;
}
.top-contact .divider { opacity: .3; }

/* ===== 主题切换按钮 ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    border-radius: 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px) saturate(1.5);
    -webkit-backdrop-filter: blur(12px) saturate(1.5);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    cursor: pointer;
    transition: all .3s ease;
    position: relative;
    overflow: hidden;
}
.theme-toggle:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-bright);
    transform: translateY(-2px);
}
.theme-toggle svg {
    position: absolute;
    width: 20px; height: 20px;
    color: var(--text-primary);
    transition: opacity .4s ease, transform .4s ease;
}
/* 默认隐藏所有图标 */
.theme-toggle .icon-sun,
.theme-toggle .icon-moon,
.theme-toggle .icon-auto {
    opacity: 0;
    transform: rotate(-90deg) scale(.5);
}
/* 根据当前模式显示对应图标 */
:root[data-theme="dark"] .theme-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0) scale(1);
}
:root[data-theme="light"] .theme-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0) scale(1);
}
:root[data-theme="auto"] .theme-toggle .icon-auto {
    opacity: 1;
    transform: rotate(0) scale(1);
}

.nav-ai-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    background: var(--grad-main);
    text-decoration: none;
    transition: all .3s ease;
    box-shadow: 0 4px 14px rgba(91, 174, 122, .35), 0 0 20px rgba(91, 174, 122, .15);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}
.nav-ai-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,.3), transparent);
    transform: translateX(-100%);
    transition: transform .6s ease;
}
.nav-ai-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(91, 174, 122, .5), 0 0 30px rgba(91, 174, 122, .25);
}
.nav-ai-link:hover::before {
    transform: translateX(100%);
}

/* ================================
   Section 通用
   ================================ */
.section {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 72px 48px 48px;
}

.section-eyebrow {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--green-1);
    margin-bottom: 12px;
}
.section-title {
    font-size: 36px;
    font-weight: 900;
    line-height: 1.25;
    margin-bottom: 16px;
    background: var(--section-title-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.section-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 0;
}
.section-header {
    text-align: center;
    margin-bottom: 36px;
}
.section-header .section-eyebrow,
.section-header .section-title,
.section-header .section-desc {
    margin-left: auto;
    margin-right: auto;
}

/* ================================
   玻璃卡片光效（通用）
   ================================ */
.card-glow {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: var(--grad-soft);
    opacity: 0;
    transition: opacity .5s ease;
    pointer-events: none;
    z-index: 0;
}

/* ================================
   Reveal 动画
   ================================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity .8s cubic-bezier(.22,1,.36,1), transform .8s cubic-bezier(.22,1,.36,1);
    transition-delay: var(--delay, 0s);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ================================
   Section 1: Hero
   ================================ */
.section-hero {
    text-align: center;
    min-height: 100vh;
}
.hero-content {
    max-width: 720px;
    position: relative;
    z-index: 2;
}
.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: 100px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}
.tag-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--green-1);
    box-shadow: 0 0 10px var(--green-1);
    animation: dot-blink 2s ease-in-out infinite;
}
@keyframes dot-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: .4; }
}
.hero-title {
    font-size: 64px;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
}
.hero-line {
    display: block;
    background: var(--hero-line-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% 200%;
    animation: gradient-shift 6s ease-in-out infinite;
}
@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}
.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 48px;
}
.btn-primary, .btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: all .3s ease;
    cursor: pointer;
}
.btn-primary {
    background: var(--grad-main);
    color: #fff;
    border: none;
    box-shadow: 0 6px 20px rgba(91, 174, 122, .35), 0 0 30px rgba(91, 174, 122, .15);
    position: relative;
    overflow: hidden;
}
.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,.3), transparent);
    transform: translateX(-100%);
    transition: transform .6s ease;
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(91, 174, 122, .5), 0 0 40px rgba(91, 174, 122, .25);
}
.btn-primary:hover::before {
    transform: translateX(100%);
}
.btn-ghost {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}
.btn-ghost:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-bright);
    box-shadow: var(--glass-shadow-hover);
    transform: translateY(-3px);
}
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
}
.stat { text-align: center; }
.stat-num {
    font-size: 36px;
    font-weight: 700;
    font-family: 'Space Grotesk', sans-serif;
    background: var(--grad-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}
.stat-sep {
    width: 1px;
    height: 40px;
    background: var(--glass-border);
}
.scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--text-muted);
}
.scroll-mouse {
    width: 22px; height: 36px;
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}
.scroll-wheel {
    width: 3px; height: 8px;
    border-radius: 2px;
    background: var(--text-muted);
    animation: scroll-wheel 2s ease-in-out infinite;
}
@keyframes scroll-wheel {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

/* ================================
   Section 2: About
   ================================ */
.about-wrap {
    max-width: var(--max-w);
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.about-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 12px;
}
.about-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}
.tag-pill {
    padding: 6px 18px;
    border-radius: 100px;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px) saturate(1.5);
    -webkit-backdrop-filter: blur(12px) saturate(1.5);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
}
.value-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.value-card {
    position: relative;
    padding: 24px 20px;
    border-radius: var(--radius);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all .4s ease;
    overflow: hidden;
}
.value-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
    z-index: 2;
}
.value-card:hover {
    transform: translateY(-4px);
    background: var(--glass-bg-hover);
    border-color: rgba(91, 174, 122, .35);
    box-shadow: var(--glass-shadow-hover), 0 0 30px rgba(91, 174, 122, .12);
}
.value-card:hover .card-glow {
    opacity: 1;
}
.value-icon {
    width: 40px; height: 40px;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}
.value-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}
.value-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ================================
   Section 3: Cloud
   ================================ */
.cloud-wrap {
    max-width: var(--max-w);
    width: 100%;
}
.cloud-cards {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}
.cloud-card {
    position: relative;
    padding: 28px 24px;
    border-radius: var(--radius);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all .4s ease;
    overflow: hidden;
}
.cloud-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
    z-index: 2;
}
.cloud-card:hover {
    transform: translateY(-6px);
    background: var(--glass-bg-hover);
    border-color: rgba(91, 174, 122, .35);
    box-shadow: var(--glass-shadow-hover), 0 0 40px rgba(91, 174, 122, .15);
}
.cloud-card:hover .card-glow {
    opacity: 1;
}
.cloud-card-featured {
    border-color: rgba(91, 174, 122, .3);
    box-shadow: 0 0 30px rgba(91, 174, 122, .12), var(--glass-shadow);
}
.featured-tag {
    position: absolute;
    top: 16px; right: 16px;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: var(--grad-main);
    z-index: 2;
}
.cloud-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}
.cloud-logo svg { width: 48px; height: 48px; }
.cloud-badge {
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 11px;
    color: var(--text-secondary);
    background: var(--cloud-badge-bg);
    backdrop-filter: blur(8px) saturate(1.5);
    -webkit-backdrop-filter: blur(8px) saturate(1.5);
    border: 1px solid var(--glass-border);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
}
.cloud-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}
.cloud-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}
.cloud-features {
    list-style: none;
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
}
.cloud-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 4px 0;
}
.check {
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--grad-main);
    flex-shrink: 0;
    position: relative;
}
.check::after {
    content: '';
    position: absolute;
    left: 5px; top: 4px;
    width: 4px; height: 7px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}
.cloud-card-bottom {
    padding-top: 16px;
    border-top: 1px solid var(--glass-border);
    position: relative;
    z-index: 1;
}
.cloud-price {
    font-size: 14px;
    font-weight: 600;
    background: var(--grad-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ================================
   Section 4: AI
   ================================ */
.ai-wrap {
    max-width: var(--max-w);
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.ai-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}
.ai-core {
    position: relative;
    width: 320px; height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.ai-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(91, 174, 122, .15);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.ai-ring-1 {
    width: 100%; height: 100%;
    animation: ring-rotate 20s linear infinite;
    border-top-color: rgba(91, 174, 122, .4);
}
.ai-ring-2 {
    width: 75%; height: 75%;
    animation: ring-rotate 15s linear infinite reverse;
    border-top-color: rgba(255, 155, 90, .3);
    border-right-color: rgba(255, 155, 90, .15);
}
.ai-ring-3 {
    width: 50%; height: 50%;
    animation: ring-rotate 10s linear infinite;
    border-top-color: rgba(91, 174, 122, .5);
}
@keyframes ring-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
.ai-center {
    position: relative;
    width: 120px; height: 120px;
    border-radius: 50%;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur-strong)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur-strong)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border-bright);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 60px rgba(91, 174, 122, .2), inset 0 1px 1px var(--glass-highlight), inset 0 -1px 1px rgba(0, 0, 0, .1);
}
.ai-token {
    font-size: 32px;
    font-weight: 900;
    font-family: 'Space Grotesk', sans-serif;
    background: var(--grad-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.ai-pulse {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid var(--green-1);
    animation: pulse-out 3s ease-out infinite;
}
@keyframes pulse-out {
    0% { transform: scale(1); opacity: .6; }
    100% { transform: scale(1.8); opacity: 0; }
}
.ai-particle {
    position: absolute;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--green-grad);
    box-shadow: 0 0 10px var(--green-grad);
}
.p1 { top: 10%; left: 50%; animation: particle-float 8s ease-in-out infinite; }
.p2 { top: 50%; right: 10%; animation: particle-float 10s ease-in-out infinite -2s; background: var(--orange-grad); box-shadow: 0 0 10px var(--orange-grad); }
.p3 { bottom: 10%; left: 50%; animation: particle-float 9s ease-in-out infinite -4s; }
.p4 { top: 50%; left: 10%; animation: particle-float 11s ease-in-out infinite -1s; background: var(--orange-grad); box-shadow: 0 0 10px var(--orange-grad); }
.p5 { top: 25%; right: 25%; animation: particle-float 7s ease-in-out infinite -3s; }
.p6 { bottom: 25%; left: 25%; animation: particle-float 12s ease-in-out infinite -5s; background: var(--orange-grad); box-shadow: 0 0 10px var(--orange-grad); }
@keyframes particle-float {
    0%, 100% { transform: translate(0, 0); opacity: .6; }
    50% { transform: translate(20px, -20px); opacity: 1; }
}
.ai-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 28px;
}
.ai-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.ai-feature {
    display: flex;
    gap: 14px;
}
.ai-feature-num {
    font-size: 24px;
    font-weight: 700;
    font-family: 'Space Grotesk', sans-serif;
    background: var(--grad-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    flex-shrink: 0;
}
.ai-feature-body h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.ai-feature-body p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ================================
   Section 5: Advantage
   ================================ */
.advantage-wrap {
    max-width: var(--max-w);
    width: 100%;
}
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.adv-item {
    position: relative;
    padding: 24px 22px;
    border-radius: var(--radius);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all .4s ease;
    overflow: hidden;
}
.adv-item::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
    z-index: 2;
}
.adv-item:hover {
    transform: translateY(-4px);
    background: var(--glass-bg-hover);
    border-color: rgba(91, 174, 122, .35);
    box-shadow: var(--glass-shadow-hover), 0 0 30px rgba(91, 174, 122, .12);
}
.adv-item:hover .card-glow {
    opacity: 1;
}
.adv-icon {
    width: 42px; height: 42px;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}
.adv-item h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}
.adv-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ================================
   Section 6: Contact
   ================================ */
.section-contact {
    flex-direction: column;
    padding-bottom: 0;
}
.contact-wrap {
    max-width: var(--max-w);
    width: 100%;
    display: flex;
    justify-content: center;
    position: relative;
    z-index: 1;
}
.contact-left { max-width: 560px; }
.contact-left .section-title { margin-bottom: 20px; }
.contact-title {
    background: linear-gradient(135deg, #5BAE7A, #FF9B5A);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.contact-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 28px;
}
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}
.contact-icon {
    width: 48px; height: 48px;
    border-radius: 14px;
    background: var(--contact-icon-bg);
    backdrop-filter: blur(12px) saturate(1.5);
    -webkit-backdrop-filter: blur(12px) saturate(1.5);
    border: 1px solid var(--contact-icon-border);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--green-1);
    flex-shrink: 0;
}
.contact-icon svg { width: 22px; height: 22px; }
.contact-label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 2px;
}
.contact-value {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

/* ================================
   Footer
   ================================ */
.site-footer {
    margin-top: 40px;
    width: 100%;
    padding: 28px 48px;
    background: var(--footer-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border-top: 1px solid var(--glass-border);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
    position: relative;
    z-index: 1;
}
.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    text-align: center;
}
.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 12px;
}
.footer-brand .logo-icon { width: 28px; height: 28px; }
.footer-brand span {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
}
.footer-text {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.footer-copy {
    font-size: 12px;
    color: var(--text-faint);
}

/* ================================
   响应式
   ================================ */
@media (max-width: 1024px) {
    .about-wrap, .ai-wrap {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .cloud-cards {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    .advantage-grid {
        grid-template-columns: 1fr 1fr;
    }
    .dot-nav { display: none; }
    .hero-title { font-size: 48px; }
}

@media (max-width: 768px) {
    .section { padding: 64px 24px 36px; }
    .top-bar { padding: 16px 24px; }
    .top-bar.scrolled { padding: 12px 24px; }
    .logo-text { font-size: 15px; }
    .top-contact { display: none; }
    .hero-title { font-size: 38px; }
    .hero-stats { gap: 20px; }
    .stat-num { font-size: 28px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .value-cards { grid-template-columns: 1fr; }
    .advantage-grid { grid-template-columns: 1fr; }
    .ai-features { grid-template-columns: 1fr; }
    .ai-core { width: 260px; height: 260px; }
    .site-footer { padding: 24px; }
    .section-title { font-size: 28px; }
}