/* 官网专用样式 · 品牌紫（主色 #7B61FF，白底 + 清晰层次） */

:root {
    --brand: #7b61ff;
    --brand-hover: #6548e8;
    --brand-soft: #f3f0ff;
    --accent-sky: #b8a8ff;
    --ink: #0f172a;
    --ink-secondary: #334155;
    --muted: #64748b;
    --line: #e2e8f0;
    --surface: #ffffff;
    --surface-alt: #f1f5f9;
    --surface-hero: #f8fafc;

    --primary-purple: #7b61ff;
    --primary-violet: #6548e8;
    --primary-pink: #c4b5fd;
    --primary-indigo: #4c36d9;
    --accent-cyan: #b8a8ff;
    --accent-pink: #7b61ff;
    --deep-violet: #0f172a;

    --bg-page: #f5f7fa;
    --bg-light: #ffffff;
    --bg-gradient-start: #f8fafc;
    --bg-gradient-end: #eef2f7;
    --bg-card: #ffffff;
    --bg-card-hover: #fafbfc;

    --text-dark: #0f172a;
    --text-gray: #334155;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    --text-muted: #64748b;

    --gradient-primary: linear-gradient(135deg, #6548e8 0%, #7b61ff 45%, #9580ff 100%);
    --gradient-hero: linear-gradient(105deg, #0f172a 0%, #1e293b 35%, #7b61ff 78%, #9580ff 100%);
    --gradient-card: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    --gradient-btn: linear-gradient(135deg, #7b61ff, #9580ff);
    --gradient-glass: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);

    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 12px 40px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.1);
    --shadow-glow: 0 0 0 1px rgba(123, 97, 255, 0.1);
    --shadow-neon: 0 8px 28px rgba(123, 97, 255, 0.15);
    --shadow-3d-card: 0 1px 0 rgba(255, 255, 255, 1) inset, 0 0 0 1px rgba(226, 232, 240, 0.9);
}

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

html {
    scroll-behavior: smooth;
    color-scheme: light;
}

body {
    font-family: 'DM Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background:
        radial-gradient(ellipse 80% 50% at 50% -10%, rgba(123, 97, 255, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse 55% 40% at 100% 0%, rgba(180, 163, 255, 0.05) 0%, transparent 45%),
        linear-gradient(180deg, #f8fafc 0%, #f1f5f9 35%, #eef2f7 100%);
    color: var(--text-dark);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.65;
}

/* 动态背景层 */
.tech-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background:
        radial-gradient(ellipse at 18% 22%, rgba(123, 97, 255, 0.06) 0%, transparent 42%),
        radial-gradient(ellipse at 82% 78%, rgba(180, 163, 255, 0.05) 0%, transparent 44%),
        radial-gradient(ellipse at 50% 100%, rgba(148, 163, 184, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.tech-bg canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.28;
}

/* 缓慢流动的淡蓝氛围光（叠在粒子上层，不阻挡交互） */
.tech-bg::after {
    content: '';
    position: absolute;
    inset: -15%;
    background:
        radial-gradient(ellipse 55% 45% at 25% 35%, rgba(123, 97, 255, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse 50% 40% at 78% 65%, rgba(148, 163, 184, 0.08) 0%, transparent 48%),
        radial-gradient(ellipse 40% 35% at 50% 92%, rgba(241, 245, 249, 0.9) 0%, transparent 45%);
    animation: ambientFlow 22s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes ambientFlow {
    0% {
        transform: translate(0, 0) scale(1) rotate(0deg);
        opacity: 0.85;
    }
    100% {
        transform: translate(4%, -3%) scale(1.06) rotate(3deg);
        opacity: 1;
    }
}

/* 科技网格（低对比，不抢内容） */
.tech-grid-overlay {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.12) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.1) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 85% 70% at 50% 40%, black 15%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 85% 70% at 50% 40%, black 15%, transparent 70%);
}

/* 浮动装饰球 */
.floating-orbs {
    position: fixed;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: rgba(123, 97, 255, 0.08);
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: rgba(180, 163, 255, 0.07);
    top: 60%;
    right: -5%;
    animation-delay: -5s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    background: rgba(148, 163, 184, 0.12);
    bottom: 10%;
    left: 30%;
    animation-delay: -10s;
}

.orb-4 {
    width: 320px;
    height: 320px;
    background: rgba(149, 128, 255, 0.08);
    top: 38%;
    right: 8%;
    animation-duration: 22s;
    animation-delay: -7s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 10px) scale(1.02); }
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border-bottom: 1px solid rgba(226, 232, 240, 0.95);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 1) inset;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    position: relative;
}

.logo i {
    font-size: 2rem;
    color: var(--brand);
    background: none;
    -webkit-text-fill-color: var(--brand);
    filter: none;
}

.logo span {
    color: var(--ink);
    background: none;
    -webkit-text-fill-color: var(--ink);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
}

.nav-links a {
    color: var(--ink-secondary);
    text-decoration: none;
    padding: 0.6rem 1.1rem;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 8px;
    transition: color 0.2s ease, background 0.2s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--brand);
    background: var(--brand-soft);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
    border-radius: 2px;
}

.nav-links a:hover::after {
    width: 60%;
}

.mobile-menu-btn {
    display: none;
    background: var(--surface-alt);
    border: 1px solid var(--line);
    padding: 0.75rem;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.mobile-menu-btn i {
    font-size: 1.25rem;
    color: var(--ink);
}

.mobile-menu-btn:hover {
    background: var(--brand-soft);
    border-color: rgba(123, 97, 255, 0.25);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 999;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--line);
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
    transform: translateY(-20px);
    opacity: 0;
    transition: all 0.3s ease;
}

.mobile-menu.active {
    display: flex;
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu a {
    color: var(--text-dark);
    text-decoration: none;
    padding: 1rem 1.5rem;
    font-weight: 500;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.mobile-menu a:hover {
    background: var(--brand-soft);
    color: var(--brand);
}

/* ==================== 首屏区域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 2rem 80px;
    z-index: 2;
}

.hero::before {
    content: '';
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    width: min(1000px, 95vw);
    height: 480px;
    background:
        radial-gradient(ellipse at center, rgba(123, 97, 255, 0.08) 0%, rgba(241, 245, 249, 0.5) 50%, transparent 72%);
    pointer-events: none;
    z-index: -1;
    filter: blur(8px);
}

.hero-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 5vw, 3.5rem);
    align-items: center;
    width: 100%;
}

.hero-left {
    animation: slideInLeft 1s ease-out;
    transform-style: preserve-3d;
    max-width: 640px;
    text-align: left;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 2rem + 4.2vw, 4.25rem);
    font-weight: 800;
    line-height: 1.12;
    margin-bottom: 1.35rem;
    letter-spacing: -0.04em;
}

.title-gradient {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    position: relative;
    filter: none;
}

.title-gradient::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 3.5rem;
    height: 4px;
    background: linear-gradient(90deg, var(--brand), var(--accent-sky));
    border-radius: 4px;
    opacity: 1;
    box-shadow: none;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--brand);
    font-weight: 600;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-subtitle::before {
    content: '';
    width: 4px;
    height: 1.1rem;
    background: var(--brand);
    border-radius: 2px;
}

.hero-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 540px;
    line-height: 1.85;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn-gradient {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.95rem 1.85rem;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    box-shadow: 0 4px 14px rgba(123, 97, 255, 0.35);
    position: relative;
    overflow: hidden;
}

.btn-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.btn-gradient:hover {
    transform: translateY(-2px) translateZ(0);
    box-shadow: 0 12px 28px rgba(123, 97, 255, 0.4);
}

.btn-gradient:hover::before {
    left: 100%;
}

.btn-outline-cyan {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.95rem 1.85rem;
    background: var(--surface);
    color: var(--brand);
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid var(--brand);
    transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    position: relative;
    overflow: hidden;
}

.btn-outline-cyan::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--gradient-primary);
    transition: width 0.4s ease;
    z-index: -1;
}

.btn-outline-cyan:hover {
    color: #fff;
    border-color: var(--brand);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(123, 97, 255, 0.2);
}

.btn-outline-cyan:hover::before {
    width: 100%;
}

/* 右侧3D卡片展示 */
.hero-right {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: slideInRight 1s ease-out 0.3s both;
    cursor: default;
}

/* 鼠标视差外层：与内层 rotateCards 动画互不覆盖 transform */
.cards-3d-tilt {
    perspective: 1600px;
    perspective-origin: 50% 42%;
    transform-style: preserve-3d;
    transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.cards-3d {
    position: relative;
    width: 400px;
    height: 400px;
    transform-style: preserve-3d;
    animation: rotateCards 28s infinite linear;
    filter: drop-shadow(0 20px 40px rgba(15, 23, 42, 0.08));
}

@keyframes rotateCards {
    0% { transform: rotateY(0deg) rotateX(8deg); }
    100% { transform: rotateY(360deg) rotateX(8deg); }
}

.cards-3d:hover {
    animation-play-state: paused;
}

.card-3d {
    position: absolute;
    width: 140px;
    height: 140px;
    background: linear-gradient(165deg, #ffffff 0%, #f8fafc 50%, #f1f5f9 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    box-shadow:
        0 16px 40px rgba(15, 23, 42, 0.08),
        0 0 0 1px var(--line),
        inset 0 1px 0 rgba(255, 255, 255, 1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--line);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.5s ease, border-color 0.4s ease;
    cursor: pointer;
}

.card-3d:hover {
    transform: scale(1.12) translateZ(52px) !important;
    box-shadow:
        0 24px 48px rgba(15, 23, 42, 0.12),
        0 0 0 1px rgba(123, 97, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 1);
    border-color: rgba(123, 97, 255, 0.35);
}

.card-3d i {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 4px 10px rgba(123, 97, 255, 0.22));
    transition: transform 0.3s ease;
}

.card-3d:hover i {
    transform: scale(1.2);
}

.card-1 {
    top: 20%;
    left: 50%;
    transform: translateX(-50%) translateZ(60px);
    animation: float1 6s infinite ease-in-out;
}

.card-2 {
    bottom: 30%;
    left: 10%;
    transform: translateZ(40px);
    animation: float2 7s infinite ease-in-out;
}

.card-3 {
    bottom: 30%;
    right: 10%;
    transform: translateZ(40px);
    animation: float3 8s infinite ease-in-out;
}

@keyframes float1 {
    0%, 100% { transform: translateX(-50%) translateZ(60px) translateY(0); }
    50% { transform: translateX(-50%) translateZ(60px) translateY(-20px); }
}

@keyframes float2 {
    0%, 100% { transform: translateZ(40px) translateY(0) rotate(-5deg); }
    50% { transform: translateZ(40px) translateY(-15px) rotate(5deg); }
}

@keyframes float3 {
    0%, 100% { transform: translateZ(40px) translateY(0) rotate(5deg); }
    50% { transform: translateZ(40px) translateY(-15px) rotate(-5deg); }
}

/* 滚动提示 */
.scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-hint i {
    font-size: 1.5rem;
    color: var(--muted);
    opacity: 0.65;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ==================== 通用板块样式 ==================== */
.section {
    position: relative;
    padding: 100px 2rem;
    z-index: 2;
}

.section-dark {
    position: relative;
    background: linear-gradient(180deg, #eef2f7 0%, #f1f5f9 45%, #e8edf3 100%);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    overflow: hidden;
}

.section-dark::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 55% at 50% 0%, rgba(255, 255, 255, 0.9) 0%, transparent 55%),
        linear-gradient(105deg, transparent 40%, rgba(123, 97, 255, 0.04) 50%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

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

.section-container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title-text {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--ink);
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    position: relative;
    display: inline-block;
    width: 100%;
    background: none;
    -webkit-text-fill-color: var(--ink);
}

.section-header .section-title-text::after {
    content: '';
    display: block;
    width: 48px;
    height: 4px;
    margin: 0.85rem auto 0;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--brand), var(--accent-sky));
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== 功能卡片 ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    perspective: 1200px;
    transform-style: preserve-3d;
}

.feature-card {
    --gx: 50%;
    --gy: 38%;
    background: var(--surface);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-sm);
    border-radius: 16px;
    padding: 2rem;
    transition: opacity 0.65s ease, transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.45s ease, background 0.4s ease, border-color 0.35s ease;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(36px) translateZ(0);
    will-change: transform;
}

.feature-card.visible {
    opacity: 1;
    transform: translateY(0) translateZ(0);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s ease;
    z-index: 2;
    border-radius: 16px 16px 0 0;
}

.feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        520px circle at var(--gx, 50%) var(--gy, 40%),
        rgba(123, 97, 255, 0.06) 0%,
        rgba(148, 163, 184, 0.04) 38%,
        transparent 62%
    );
    opacity: 0;
    transition: opacity 0.45s ease;
    pointer-events: none;
    z-index: 0;
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-card__row {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: flex-start;
    gap: 1.15rem;
}

.feature-card--link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.feature-card--link:hover {
    color: inherit;
}

.feature-card:hover {
    background: var(--surface);
    box-shadow: var(--shadow-md);
    border-color: rgba(123, 97, 255, 0.22);
}

@media (max-width: 768px) {
    .feature-card:hover {
        transform: translateY(-10px);
    }
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon-wrap {
    flex: 0 0 auto;
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.feature-card:hover .feature-icon-wrap {
    transform: scale(1.05);
}

.feature-emoji {
    font-size: 1.65rem;
    line-height: 1;
}

.feature-icon-wrap > i {
    font-size: 1.45rem;
    line-height: 1;
}

.feature-card__body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding-top: 0.1rem;
}

.feature-card__title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0;
    line-height: 1.35;
    letter-spacing: -0.02em;
}

.feature-card__desc {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
    margin: 0;
}

/* ==================== 用户评价 ==================== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    perspective: 1200px;
    transform-style: preserve-3d;
}

.review-card {
    --gx: 50%;
    --gy: 38%;
    background: var(--surface);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 2rem;
    transition: opacity 0.65s ease, transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.45s ease, background 0.4s ease, border-color 0.35s ease;
    opacity: 0;
    transform: translateY(36px) translateZ(0);
    will-change: transform;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.review-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        520px circle at var(--gx, 50%) var(--gy, 40%),
        rgba(123, 97, 255, 0.05) 0%,
        transparent 62%
    );
    opacity: 0;
    transition: opacity 0.45s ease;
    pointer-events: none;
    z-index: 0;
}

.review-card:hover::after {
    opacity: 1;
}

.review-card > * {
    position: relative;
    z-index: 1;
}

.review-card.visible {
    opacity: 1;
    transform: translateY(0) translateZ(0);
}

.review-card:hover {
    background: var(--surface);
    box-shadow: var(--shadow-md);
    border-color: rgba(123, 97, 255, 0.2);
}

@media (max-width: 768px) {
    .review-card:hover {
        transform: translateY(-6px) scale(1.01);
    }
}

.review-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.review-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(123, 97, 255, 0.25);
}

.review-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.review-info h4 {
    font-weight: 700;
    color: var(--text-dark);
    font-size: 1rem;
}

.review-info span {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.review-content {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1rem;
    font-style: italic;
}

.review-rating {
    display: flex;
    gap: 0.25rem;
}

.review-rating i {
    color: #fbbf24;
    font-size: 0.9rem;
}

/* ==================== 案例展示 ==================== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    perspective: 1200px;
    transform-style: preserve-3d;
}

.case-card {
    --gx: 50%;
    --gy: 35%;
    background: var(--surface);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 1px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
    transition: opacity 0.65s ease, transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.45s ease, border-color 0.35s ease;
    opacity: 0;
    transform: translateY(36px) translateZ(0);
    will-change: transform;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.case-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        480px circle at var(--gx, 50%) var(--gy, 35%),
        rgba(123, 97, 255, 0.06) 0%,
        transparent 55%
    );
    opacity: 0;
    transition: opacity 0.45s ease;
    pointer-events: none;
    z-index: 1;
}

.case-card:hover::after {
    opacity: 1;
}

.case-card > * {
    position: relative;
    z-index: 2;
}

.case-card.visible {
    opacity: 1;
    transform: translateY(0) translateZ(0);
}

.case-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(123, 97, 255, 0.22);
}

@media (max-width: 768px) {
    .case-card:hover {
        transform: translateY(-10px) scale(1.02);
    }
}

.case-image {
    height: 200px;
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #e9e5ff 100%);
    position: relative;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(123, 97, 255, 0.35);
}

.case-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.4rem 1rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.case-content {
    padding: 1.5rem;
}

.case-content h3 {
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.case-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ==================== 下载区域 ==================== */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.download-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    perspective: 1200px;
}

.download-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 880px;
    margin: 0 auto;
    perspective: 1200px;
}

.download-warning {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, rgba(254, 243, 199, 0.85), rgba(253, 230, 138, 0.35));
    border: 1px solid rgba(245, 158, 11, 0.35);
    border-radius: 50px;
    color: #92400e;
    font-size: 0.95rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-warning i {
    font-size: 1.1rem;
}

.download-card {
    --gx: 50%;
    --gy: 40%;
    background: var(--surface);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: opacity 0.65s ease, transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.45s ease, border-color 0.35s ease, background 0.4s ease;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    transform: translateY(36px) translateZ(0);
    will-change: transform;
    box-shadow: var(--shadow-sm);
    color: inherit;
    position: relative;
    overflow: hidden;
}

.download-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        480px circle at var(--gx, 50%) var(--gy, 40%),
        rgba(123, 97, 255, 0.06) 0%,
        transparent 58%
    );
    opacity: 0;
    transition: opacity 0.45s ease;
    pointer-events: none;
    z-index: 0;
}

.download-card:hover::after {
    opacity: 1;
}

.download-card > * {
    position: relative;
    z-index: 1;
}

.download-card.visible {
    opacity: 1;
    transform: translateY(0) translateZ(0);
}

.download-card:hover {
    background: var(--surface);
    box-shadow: var(--shadow-md);
    border-color: rgba(123, 97, 255, 0.22);
}

@media (max-width: 768px) {
    .download-card:hover {
        transform: translateY(-10px);
    }
}

.download-icon {
    width: 70px;
    height: 70px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin-bottom: 1.25rem;
    transition: all 0.4s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.download-card:hover .download-icon {
    transform: scale(1.1) rotate(5deg);
}

.download-card h3 {
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 1.15rem;
}

.download-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
}

.download-btns {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: center;
    width: 100%;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    text-decoration: none;
    border: none;
    cursor: pointer;
    min-width: 140px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(123, 97, 255, 0.28);
}

.download-btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.download-btn-success {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
}

.download-btn-outline {
    background: var(--surface);
    border: 2px solid rgba(123, 97, 255, 0.35);
    color: var(--brand);
    padding: 0.6rem 1.3rem;
}

.download-btn-outline:hover {
    background: var(--brand-soft);
    border-color: var(--brand);
}

.download-btn-disabled {
    background: rgba(226, 232, 240, 0.85);
    color: var(--text-light);
    cursor: not-allowed;
}

.download-btn-disabled:hover {
    transform: none;
    box-shadow: none;
}

.download-qrcode {
    width: 100px;
    height: 100px;
    background: white;
    border-radius: 12px;
    padding: 6px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.download-qrcode img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

/* ==================== 页脚（底部品牌 + 可配置链接） ==================== */
.footer.footer-premium {
    position: relative;
    z-index: 2;
    padding: 4.5rem 2rem 2.75rem;
    overflow: hidden;
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 45%, #0f172a 100%);
    border-top: 1px solid rgba(148, 163, 184, 0.2);
}

.footer-premium__pattern {
    position: absolute;
    inset: 0;
    opacity: 0.35;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent 75%);
    pointer-events: none;
}

.footer-premium__glow {
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: min(520px, 90vw);
    height: 200px;
    background: radial-gradient(ellipse at center, rgba(123, 97, 255, 0.2) 0%, rgba(15, 23, 42, 0.4) 45%, transparent 70%);
    filter: blur(20px);
    pointer-events: none;
}

.footer-premium__inner {
    position: relative;
    z-index: 1;
}

.footer-container {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-brand__emoji {
    font-size: 1.85rem;
    line-height: 1;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.25));
}

.footer-brand__icon {
    font-size: 1.75rem;
    background: linear-gradient(135deg, #c4b5fd 0%, #7b61ff 55%, #ddd6fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 12px rgba(123, 97, 255, 0.35));
}

.footer-brand__name {
    font-size: clamp(1.35rem, 3vw, 1.75rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #f8fafc;
    background: none;
    -webkit-text-fill-color: #f8fafc;
    filter: none;
}

.footer-tagline {
    color: rgba(226, 232, 240, 0.82);
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.65;
    margin: 0 auto 1.75rem;
    max-width: 28rem;
}

.footer-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem 2.25rem;
    margin-bottom: 1.75rem;
}

.footer-nav__link {
    color: rgba(226, 232, 240, 0.92);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 600;
    padding: 0.35rem 0;
    transition: color 0.25s ease;
}

.footer-nav__link:hover {
    color: #d4c4ff;
}

.footer-divider {
    width: 100%;
    max-width: 280px;
    height: 1px;
    margin: 0 auto 1.25rem;
    background: linear-gradient(90deg, transparent, rgba(148, 163, 184, 0.45), transparent);
}

.footer-copyright {
    color: rgba(148, 163, 184, 0.75);
    font-size: 0.8125rem;
    margin: 0;
    letter-spacing: 0.02em;
}

/* 兼容旧类名（若其它页引用） */
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.copyright {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .download-grid-4,
    .download-grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .reviews-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: inherit;
    }
    
    .hero-left {
        order: 1;
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
        text-align: left;
        display: flex;
        flex-direction: column;
        align-items: stretch;
    }
    
    /* 手机/平板：主标题 + 紫色副标题居中；说明文左对齐更易读 */
    .hero-title {
        text-align: center;
        align-self: center;
        width: 100%;
        font-size: 3rem;
    }
    
    .hero-subtitle {
        justify-content: center;
        text-align: center;
        width: 100%;
        align-self: center;
        max-width: 36rem;
        line-height: 1.45;
    }
    
    .title-gradient::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .hero-right {
        order: 0;
    }
    
    .hero-desc {
        text-align: left;
        margin: 0 auto 2rem;
        max-width: 36rem;
        width: 100%;
        align-self: center;
        hyphens: auto;
        -webkit-hyphens: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-subtitle::before {
        display: none;
    }
    
    .cards-3d {
        width: 300px;
        height: 300px;
    }
    
    .card-3d {
        width: 100px;
        height: 100px;
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 100px 1.5rem 60px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section {
        padding: 60px 1.5rem;
    }
    
    .section-title-text {
        font-size: 2rem;
    }
    
    .reviews-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .download-grid,
    .download-grid-4,
    .download-grid-2 {
        grid-template-columns: 1fr;
    }
    
    .download-warning {
        font-size: 0.85rem;
        padding: 0.75rem 1rem;
    }
    
    .footer-nav {
        gap: 0.75rem 1.25rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-gradient,
    .btn-outline-cyan {
        width: 100%;
        justify-content: center;
    }
    
    .cards-3d {
        width: 250px;
        height: 250px;
    }
    
    .card-3d {
        width: 80px;
        height: 80px;
        font-size: 1.5rem;
    }
}

/* ==================== 滚动条美化 ==================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #7b61ff, #9580ff);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #6548e8, #7b61ff);
}

/* 选中文本 */
::selection {
    background: rgba(123, 97, 255, 0.22);
    color: var(--ink);
}

/* ==================== 动画类 ==================== */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 玻璃拟态效果 */
.glass {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--line);
}

/* 悬浮光效 */
.glow-hover:hover {
    box-shadow:
        0 0 0 1px rgba(123, 97, 255, 0.12),
        0 12px 40px rgba(15, 23, 42, 0.08);
}

/* 减少动态：可访问性 */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .tech-bg::after {
        animation: none;
        transform: none;
        opacity: 0.88;
    }
    .cards-3d {
        animation: none;
    }
    .cards-3d-tilt {
        transform: none !important;
    }
    .card-3d {
        animation: none !important;
    }
    .orb {
        animation: none;
    }
    .scroll-hint {
        animation: none;
    }
    .feature-card,
    .review-card,
    .case-card,
    .download-card {
        transition: opacity 0.35s ease;
    }
    .feature-card::after,
    .review-card::after,
    .case-card::after,
    .download-card::after {
        transition: none;
        opacity: 0;
    }
}