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

:root {
    --primary: #a78bfa;
    --primary-light: #c4b5fd;
    --primary-dark: #7c3aed;
    --accent: #22d3ee;
    --accent-bright: #67e8f9;
    --accent-glow: rgba(34,211,238,.5);
    --pink: #f472b6;
    --pink-glow: rgba(244,114,182,.4);
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --bg: #030306;
    --bg-subtle: #08080e;
    --bg-card: #0c0c14;
    --border: #1a1a2a;
    --border-glow: rgba(167,139,250,.25);
    --shadow-sm: 0 1px 3px rgba(0,0,0,.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,.5);
    --shadow-lg: 0 20px 48px rgba(0,0,0,.6);
    --glow-primary: 0 0 40px rgba(167,139,250,.4);
    --glow-accent: 0 0 40px rgba(34,211,238,.4);
    --glow-pink: 0 0 40px rgba(244,114,182,.4);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

/* 全局噪点纹理 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: .02;
    pointer-events: none;
    z-index: 9999;
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all .2s ease;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 30px rgba(167,139,250,.3);
}
.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,.15) 0%, transparent 50%);
    opacity: 0;
    transition: opacity .3s;
}
.btn-primary::after {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--primary), var(--accent), var(--pink), var(--primary));
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    filter: blur(12px);
    transition: opacity .3s;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px rgba(167,139,250,.5), 0 0 0 1px rgba(167,139,250,.4);
}
.btn-primary:hover::before {
    opacity: 1;
}
.btn-primary:hover::after {
    opacity: .6;
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(167,139,250,.1);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover {
    color: var(--text);
}

.btn-nav {
    background: var(--primary);
    color: white;
    font-size: 13px;
    padding: 8px 18px;
}
.btn-nav:hover {
    background: var(--primary-dark);
}

.btn-large {
    padding: 14px 28px;
    font-size: 15px;
    border-radius: 10px;
}

/* ========================================
   Navbar
======================================== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(10,10,15,.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(42,42,58,.8);
    transition: box-shadow .3s;
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,.3);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: inherit;
}

.logo-mark {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: transparent;
    font-weight: 800;
    font-size: 16px;
    border: 1px solid rgba(167,139,250,.3);
    position: relative;
    box-shadow: 0 0 20px rgba(167,139,250,.3), 0 0 40px rgba(34,211,238,.15);
    animation: logoGlow 3s ease-in-out infinite;
}

.logo-mark span {
    background: linear-gradient(135deg, #a78bfa 0%, #22d3ee 50%, #f472b6 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

@keyframes logoGlow {
    0%, 100% { box-shadow: 0 0 20px rgba(167,139,250,.4), 0 0 40px rgba(34,211,238,.2); }
    50% { box-shadow: 0 0 30px rgba(167,139,250,.5), 0 0 60px rgba(34,211,238,.3); }
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 36px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color .2s;
}
.nav-links a:hover {
    color: var(--text);
}

/* ========================================
   Hero
======================================== */
.hero {
    position: relative;
    padding: 130px 0 100px;
    overflow: hidden;
    text-align: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: var(--bg);
}

/* 网格背景 */
.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(167,139,250,.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(167,139,250,.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 20%, transparent 70%);
}

/* 动态光晕 */
.hero-glow {
    position: absolute;
    top: -150px;
    left: 50%;
    transform: translateX(-50%);
    width: 1000px;
    height: 800px;
    background: 
        radial-gradient(ellipse 50% 40% at 50% 45%, rgba(167,139,250,.18) 0%, transparent 60%),
        radial-gradient(ellipse 35% 30% at 30% 55%, rgba(34,211,238,.15) 0%, transparent 50%),
        radial-gradient(ellipse 30% 25% at 70% 50%, rgba(244,114,182,.12) 0%, transparent 50%),
        radial-gradient(ellipse 25% 20% at 45% 70%, rgba(167,139,250,.08) 0%, transparent 50%);
    animation: glowPulse 8s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
    50% { opacity: .8; transform: translateX(-50%) scale(1.05); }
}

/* 底部光带 */
.hero-glow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 200px;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(167,139,250,.1) 20%,
        rgba(34,211,238,.15) 50%,
        rgba(244,114,182,.1) 80%,
        transparent);
    filter: blur(60px);
    animation: lightBeam 6s ease-in-out infinite;
}

@keyframes lightBeam {
    0%, 100% { opacity: .6; }
    50% { opacity: 1; }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: rgba(167,139,250,.12);
    border: 1px solid rgba(167,139,250,.35);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 28px;
    box-shadow: 0 0 20px rgba(167,139,250,.2), inset 0 0 20px rgba(167,139,250,.05);
    animation: badgePulse 4s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { box-shadow: 0 0 20px rgba(167,139,250,.2), inset 0 0 20px rgba(167,139,250,.05); }
    50% { box-shadow: 0 0 30px rgba(167,139,250,.3), inset 0 0 25px rgba(167,139,250,.08); }
}

.hero-title {
    font-size: 80px;
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -3px;
    margin-bottom: 28px;
    color: var(--text);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 40%, var(--pink) 70%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 300% 300%;
    animation: gradientShift 6s ease-in-out infinite;
    text-shadow: 0 0 80px rgba(167,139,250,.5);
    filter: drop-shadow(0 0 30px rgba(167,139,250,.3));
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-desc {
    max-width: 580px;
    margin: 0 auto 36px;
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-bottom: 60px;
    flex-wrap: wrap;
    align-items: center;
}

/* QR 二维码弹窗 */
.qr-trigger-wrap {
    position: relative;
}

.qr-trigger {
    border: 1.5px solid rgba(167,139,250,.3);
    color: var(--primary);
    gap: 7px;
}
.qr-trigger:hover {
    background: rgba(167,139,250,.1);
    color: var(--primary);
}

.qr-popover {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    opacity: 0;
    pointer-events: none;
    transition: all .22s ease;
    z-index: 200;
}
.qr-popover.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.qr-box {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px 20px 16px;
    box-shadow: 0 20px 48px rgba(0,0,0,.4), 0 0 0 1px rgba(42,42,58,.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    min-width: 180px;
}

/* 箭头 */
.qr-box::before {
    content: '';
    position: absolute;
    top: -7px;
    left: 50%;
    transform: translateX(-50%);
    width: 14px;
    height: 14px;
    background: var(--bg-card);
    border-radius: 2px;
    transform: translateX(-50%) rotate(45deg);
    box-shadow: -2px -2px 4px rgba(0,0,0,.2);
}

.qr-img-wrap {
    width: 148px;
    height: 148px;
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-subtle);
    border: 1px solid var(--border);
}

.qr-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.qr-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.qr-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.qr-tip {
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.6;
}
.qr-tip a {
    color: var(--primary);
    text-decoration: none;
}
.qr-tip a:hover { text-decoration: underline; }

/* App Mockup */
.hero-mockup {
    display: flex;
    justify-content: center;
    perspective: 1000px;
}

.mockup-window {
    width: 720px;
    background: rgba(15,15,24,.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: 
        0 0 0 1px rgba(167,139,250,.2),
        0 0 80px rgba(167,139,250,.15),
        0 0 120px rgba(34,211,238,.08),
        0 40px 80px rgba(0,0,0,.5);
    overflow: hidden;
    display: grid;
    grid-template-columns: 52px 1fr;
    grid-template-rows: 44px 1fr;
    transform: rotateX(2deg) rotateY(-1deg);
    transition: all .4s ease;
    position: relative;
}

.mockup-window::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(167,139,250,.4), rgba(34,211,238,.2), rgba(244,114,182,.2), transparent);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    pointer-events: none;
}

.mockup-window:hover {
    transform: rotateX(0deg) rotateY(0deg);
    box-shadow: 
        0 0 0 1px rgba(167,139,250,.3),
        0 0 100px rgba(167,139,250,.2),
        0 0 150px rgba(34,211,238,.12),
        0 50px 100px rgba(0,0,0,.5);
}

.mockup-titlebar {
    grid-column: 1 / -1;
    background: var(--bg-subtle);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

.traffic-lights {
    display: flex;
    gap: 6px;
}
.tl-red { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; }
.tl-yellow { width: 11px; height: 11px; border-radius: 50%; background: #febc2e; }
.tl-green { width: 11px; height: 11px; border-radius: 50%; background: #28c840; }

.mockup-title {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    flex: 1;
    text-align: center;
}

.mockup-sidebar {
    background: var(--bg-subtle);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 0;
    gap: 8px;
}

.sidebar-item {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all .2s;
}
.sidebar-item:hover, .sidebar-item.active {
    background: rgba(167,139,250,.15);
    color: var(--primary);
}

.mockup-chat {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 200px;
}

.chat-msg {
    max-width: 80%;
}

.user-msg {
    align-self: flex-end;
}
.user-msg p {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 10px 14px;
    border-radius: 14px 14px 2px 14px;
    font-size: 13px;
}

.ai-msg {
    align-self: flex-start;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.ai-msg p {
    background: var(--bg-subtle);
    color: var(--text);
    padding: 10px 14px;
    border-radius: 14px 14px 14px 2px;
    font-size: 13px;
    border: 1px solid var(--border);
}

.tool-call {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: rgba(34,197,94,.1);
    border: 1px solid rgba(34,197,94,.3);
    border-radius: 8px;
    font-size: 12px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: #4ade80;
}
.tool-status.done {
    color: #16a34a;
    font-weight: 600;
}

.typing .typing-dots {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: var(--bg-subtle);
    border-radius: 14px 14px 14px 2px;
    width: fit-content;
}
.typing-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: bounce 1.2s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: .2s; }
.typing-dots span:nth-child(3) { animation-delay: .4s; }

@keyframes bounce {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-6px); }
}

/* ========================================
   Section Shared
======================================== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(167,139,250,.15);
    color: var(--primary-light);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .5px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 52px;
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 18px;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary-light) 50%, var(--accent-bright) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 60px rgba(167,139,250,.3);
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
}

/* ========================================
   Features
======================================== */
.features {
    padding: 100px 0;
    background: var(--bg);
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.feature-item {
    display: grid;
    grid-template-columns: 80px 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.feature-item.reverse {
    grid-template-columns: 80px 1fr 1fr;
}
.feature-item.reverse .feature-visual {
    order: -1;
    grid-column: 3;
}
.feature-item.reverse .feature-num {
    order: 0;
    grid-column: 1;
}
.feature-item.reverse .feature-body {
    grid-column: 2;
}

.feature-num {
    font-size: 56px;
    font-weight: 900;
    color: rgba(167,139,250,.2);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.feature-body h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 14px;
}

.feature-body p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Feature Visuals */
.feature-visual {
    background: rgba(15,15,24,.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: 36px;
    border: 1px solid var(--border);
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.feature-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, rgba(167,139,250,.1) 0%, transparent 50%);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    pointer-events: none;
}

.exec-visual {
    gap: 12px;
    flex-wrap: wrap;
}
.exec-step {
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--bg-subtle);
    border: 1.5px solid var(--border);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}
.exec-step.done {
    border-color: rgba(34,197,94,.5);
    background: rgba(34,197,94,.1);
    color: #4ade80;
}
.exec-step.active {
    border-color: var(--primary);
    background: rgba(167,139,250,.1);
    color: var(--primary-light);
}
.exec-arrow {
    color: var(--text-secondary);
    font-size: 18px;
}

.channels-visual {
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}
.channel-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-subtle);
    border: 1.5px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
}
.channel-arrow {
    font-size: 20px;
    color: var(--primary);
    font-weight: 700;
}
.channel-target {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
}

.auto-visual {
    flex-direction: column;
}
.auto-flow {
    display: flex;
    align-items: center;
    gap: 0;
}
.auto-node {
    padding: 10px 20px;
    background: var(--bg-subtle);
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}
.auto-node.highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border: none;
    color: white;
}
.auto-line {
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--border), var(--primary));
}

/* ========================================
   Cases (Use Cases / Screenshots)
======================================== */
.cases {
    padding: 100px 0;
    background: var(--bg);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

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

.case-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 9/16;
    max-height: 500px;
    background: #000;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
}

.case-info {
    padding: 24px;
}

.case-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
}

.case-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .case-image {
        max-height: 400px;
    }
}

/* ========================================
   Channels
======================================== */
.channels {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-subtle) 0%, var(--bg) 100%);
}

.channels-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 20px;
}

.channel-card {
    padding: 28px;
    background: rgba(15,15,24,.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: all .4s cubic-bezier(.4,0,.2,1);
    position: relative;
}

.channel-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, rgba(167,139,250,.3) 0%, rgba(34,211,238,.2) 50%, rgba(244,114,182,.15) 100%);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    opacity: 0;
    transition: opacity .4s;
    pointer-events: none;
}

.channel-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 0 40px rgba(167,139,250,.2), 0 20px 50px rgba(0,0,0,.4);
    border-color: transparent;
}

.channel-card:hover::before {
    opacity: 1;
}

.channel-card.primary {
    background: linear-gradient(135deg, rgba(167,139,250,.1) 0%, rgba(34,211,238,.06) 100%);
    border-color: rgba(167,139,250,.25);
    box-shadow: 0 0 30px rgba(167,139,250,.15);
}

.channel-icon {
    font-size: 36px;
    margin-bottom: 14px;
    display: block;
}

.channel-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.channel-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.channel-demo {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 16px;
}

.demo-bubble {
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 13px;
}
.demo-bubble.user {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    align-self: flex-end;
    border-radius: 10px 10px 2px 10px;
}
.demo-bubble.ai {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    align-self: flex-start;
    border-radius: 10px 10px 10px 2px;
}

/* ========================================
   Skills
======================================== */
.skills-section {
    padding: 100px 0;
    background: var(--bg);
}

.skills-showcase {
    background: rgba(15,15,24,.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: 44px;
    border: 1px solid var(--border);
    position: relative;
}

.skills-showcase::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, rgba(167,139,250,.15) 0%, transparent 50%, rgba(34,211,238,.08) 100%);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    pointer-events: none;
}

.skills-categories {
    display: flex;
    gap: 8px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.skill-cat {
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all .2s;
    background: var(--bg-subtle);
    border: 1.5px solid var(--border);
    color: var(--text-secondary);
}
.skill-cat.active, .skill-cat:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-subtle);
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    transition: all .2s;
    cursor: default;
}
.skill-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.skill-tag.highlight {
    background: rgba(167,139,250,.1);
    border-color: rgba(167,139,250,.4);
    color: var(--primary-light);
    font-weight: 600;
}

/* ========================================
   Advantages
======================================== */
.advantages {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg) 0%, rgba(167,139,250,.02) 50%, var(--bg) 100%);
    position: relative;
}

.advantages::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(167,139,250,.08) 0%, transparent 60%);
    pointer-events: none;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: linear-gradient(135deg, rgba(167,139,250,.15) 0%, rgba(34,211,238,.08) 50%, rgba(244,114,182,.08) 100%);
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
}

.adv-card {
    padding: 44px 36px;
    background: rgba(10,10,15,.95);
    transition: all .3s;
    position: relative;
}
.adv-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(167,139,250,.5), rgba(34,211,238,.3), transparent);
    opacity: 0;
    transition: opacity .3s;
}
.adv-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(167,139,250,.1) 0%, transparent 60%);
    opacity: 0;
    transition: opacity .3s;
    pointer-events: none;
}
.adv-card:hover {
    background: rgba(20,20,30,.95);
}
.adv-card:hover::before {
    opacity: 1;
}
.adv-card:hover::after {
    opacity: 1;
}

.adv-icon {
    font-size: 36px;
    margin-bottom: 16px;
    display: block;
}

.adv-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
}

.adv-card p {
    font-size: 14px;
    color: rgba(255,255,255,.55);
    line-height: 1.75;
}

/* ========================================
   Download
======================================== */
.download {
    padding: 100px 0;
    background: var(--bg);
}

.download-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 20px;
    max-width: 960px;
    margin: 0 auto 24px;
}

.download-card {
    padding: 36px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    background: rgba(15,15,24,.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all .4s cubic-bezier(.4,0,.2,1);
    position: relative;
    display: flex;
    flex-direction: column;
}
.download-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, rgba(167,139,250,.35) 0%, rgba(34,211,238,.2) 50%, rgba(244,114,182,.15) 100%);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    opacity: 0;
    transition: opacity .4s;
    pointer-events: none;
}
.download-card:hover {
    border-color: transparent;
    transform: translateY(-6px);
    box-shadow: 0 0 50px rgba(167,139,250,.2), 0 25px 60px rgba(0,0,0,.4);
}
.download-card:hover::before {
    opacity: 1;
}

.download-card.featured {
    background: linear-gradient(135deg, rgba(167,139,250,.12) 0%, rgba(34,211,238,.06) 100%);
    border-color: rgba(167,139,250,.3);
    box-shadow: 0 0 40px rgba(167,139,250,.15);
}

.dl-platform {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.dl-icon {
    font-size: 36px;
}

.dl-platform h3 {
    font-size: 18px;
    font-weight: 700;
}

.dl-badge {
    display: inline-block;
    padding: 2px 8px;
    background: var(--primary);
    color: white;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 700;
    margin-left: 8px;
}

.download-card > p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
    flex: 1;
}

.download-card .btn {
    width: 100%;
    justify-content: center;
}

.dl-version {
    display: block;
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
}

.download-tip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    max-width: 960px;
    margin: 0 auto;
}

/* ========================================
   Footer
======================================== */
.footer {
    background: #050508;
    color: white;
    padding: 64px 0 32px;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .logo-mark {
    background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
    border: 1px solid rgba(167,139,250,.3);
}

.footer-brand .logo-mark span {
    background: linear-gradient(135deg, #a78bfa 0%, #22d3ee 50%, #f472b6 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.footer-brand .logo-name {
    color: white;
}

.footer-brand > p {
    margin-top: 12px;
    font-size: 14px;
    color: rgba(255,255,255,.45);
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}
.footer-social a {
    color: rgba(255,255,255,.4);
    transition: color .2s;
}
.footer-social a:hover {
    color: white;
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
    color: rgba(255,255,255,.8);
}

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

.footer-links a {
    color: rgba(255,255,255,.45);
    text-decoration: none;
    font-size: 14px;
    transition: color .2s;
}
.footer-links a:hover {
    color: rgba(255,255,255,.9);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.08);
    padding-top: 28px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-beian {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 13px;
    color: rgba(255,255,255,.3);
}
.footer-beian a {
    color: rgba(255,255,255,.3);
    text-decoration: none;
    transition: color .2s;
}
.footer-beian a:hover {
    color: rgba(255,255,255,.7);
}
.beian-sep {
    color: rgba(255,255,255,.15);
}

.footer-bottom > p {
    font-size: 13px;
    color: rgba(255,255,255,.3);
}

/* ========================================
   Toast
======================================== */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-card);
    color: white;
    padding: 12px 24px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: all .3s ease;
    z-index: 9999;
    white-space: nowrap;
    border: 1px solid var(--border);
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ========================================
   Responsive
======================================== */
@media (max-width: 1024px) {
    .hero-title { font-size: 60px; }
    .channels-grid { grid-template-columns: 1fr 1fr; }
    .advantages-grid { grid-template-columns: 1fr 1fr; }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .feature-item, .feature-item.reverse {
        grid-template-columns: 60px 1fr;
        grid-template-rows: auto auto;
    }
    .feature-item .feature-visual {
        grid-column: 1 / -1;
    }
    .feature-item.reverse .feature-visual {
        order: 3;
        grid-column: 1 / -1;
    }
    .feature-item.reverse .feature-body {
        grid-column: 2;
    }
    .download-grid { grid-template-columns: 1fr; max-width: 440px; }
    .section-header h2 { font-size: 40px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero-title { font-size: 44px; letter-spacing: -1px; }
    .hero-desc { font-size: 16px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .mockup-window { width: 100%; transform: none; }
    .section-header h2 { font-size: 32px; }
    .channels-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
    .feature-item { gap: 20px; }
    .skills-showcase { padding: 24px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 36px; }
    .hero { padding: 110px 0 60px; }
    .footer-top { grid-template-columns: 1fr; }
}