/* ============================================
   AREDY 投影幕布品牌官网 — 样式表
   设计理念：影院级暗色美学 · 光影质感 · 金色点缀
   ============================================ */

/* ---------- 基础重置 ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 色彩系统 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161e;
    --bg-elevated: #1c1c26;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(232, 184, 90, 0.3);

    --text-primary: #f5f5f7;
    --text-secondary: #a0a0b0;
    --text-muted: #6a6a78;

    --accent: #e8b85a;
    --accent-bright: #f0c878;
    --accent-dim: rgba(232, 184, 90, 0.15);
    --accent-glow: rgba(232, 184, 90, 0.4);

    --gradient-gold: linear-gradient(135deg, #e8b85a 0%, #f0d090 50%, #e8b85a 100%);
    --gradient-dark: linear-gradient(180deg, #0a0a0f 0%, #111118 100%);
    --gradient-card: linear-gradient(145deg, #16161e 0%, #1c1c26 100%);

    /* 尺寸 */
    --container-max: 1200px;
    --nav-height: 100px;
    --radius: 12px;
    --radius-lg: 20px;

    /* 动效 */
    --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition: 0.4s var(--ease);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 通用按钮 ---------- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--gradient-gold);
    color: #1a1a22;
    font-weight: 600;
    font-size: 15px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 24px rgba(232, 184, 90, 0.25);
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(232, 184, 90, 0.4);
}

.btn-primary svg { transition: transform 0.3s var(--ease); }
.btn-primary:hover svg { transform: translateX(4px); }

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 15px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-hover);
}

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

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(10, 10, 15, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.9);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 1px;
    flex-shrink: 0;
    text-decoration: none;
}

/* LOGO 图片 — 线框风格，红框+透字+白描边，在深色主题下完美融入 */
.logo-img {
    height: 76px;
    width: auto;
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    transition: var(--transition);
    display: block;
    filter: drop-shadow(0 2px 8px rgba(220, 38, 38, 0.35));
}

.nav-logo:hover .logo-img,
.footer-logo:hover .logo-img {
    transform: translateY(-1px);
    filter: drop-shadow(0 4px 16px rgba(220, 38, 38, 0.55)) drop-shadow(0 0 16px rgba(232, 184, 90, 0.3));
}

.footer-logo {
    display: inline-flex;
    text-decoration: none;
}

.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gradient-gold);
    color: #1a1a22;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 900;
}

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

.nav-menu {
    display: flex;
    gap: 4px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.nav-link.active {
    color: var(--accent);
}

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

/* 语言切换按钮 */
.nav-lang-item { display: flex; align-items: center; margin-left: 8px; }

.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.03em;
    cursor: pointer;
    transition: var(--transition);
}

.lang-switch:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

.btn-nav-cta {
    padding: 10px 20px;
    background: var(--gradient-gold);
    color: #1a1a22;
    font-weight: 600;
    font-size: 14px;
    border-radius: 6px;
    transition: var(--transition);
}

.btn-nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(232, 184, 90, 0.3);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero 首屏 ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 24px 80px;
}

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

.hero-light-beam {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 100%;
    background: linear-gradient(180deg,
        rgba(232, 184, 90, 0.12) 0%,
        rgba(232, 184, 90, 0.04) 40%,
        transparent 70%);
    filter: blur(60px);
    animation: beamPulse 4s ease-in-out infinite;
}

@keyframes beamPulse {
    0%, 100% { opacity: 0.6; width: 800px; }
    50% { opacity: 1; width: 900px; }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(232, 184, 90, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(232, 184, 90, 0.08);
    border: 1px solid rgba(232, 184, 90, 0.2);
    border-radius: 100px;
    font-size: 13px;
    color: var(--accent-bright);
    font-weight: 500;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
    animation: fadeInDown 0.8s var(--ease) both;
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-glow);
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-size: clamp(40px, 7vw, 84px);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -2px;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s var(--ease) 0.1s both;
}

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

.hero-subtitle {
    font-size: clamp(15px, 2vw, 18px);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s var(--ease) 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
    animation: fadeInUp 0.8s var(--ease) 0.3s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    animation: fadeInUp 0.8s var(--ease) 0.4s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-value {
    display: inline-flex;
    align-items: baseline;
    line-height: 1;
}

.stat-num {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    font-family: 'Inter', sans-serif;
}

.stat-suffix {
    font-size: clamp(20px, 2.8vw, 26px);
    font-weight: 800;
    color: var(--accent);
    margin-left: 3px;
    line-height: 1;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
    animation: fadeIn 1s var(--ease) 1s both;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--accent) 0%, transparent 100%);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 通用 Section ---------- */
section { position: relative; }

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 16px;
    font-family: 'Inter', sans-serif;
}

.section-title {
    font-size: clamp(28px, 4.5vw, 44px);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

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

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* ---------- 品牌主张 ---------- */
.brand {
    padding: 120px 0;
    background: var(--bg-secondary);
}

/* LOGO 视觉展示区 */
.brand-logo-showcase {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    margin: 0 auto 64px;
    padding: 60px 80px;
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 520px;
    height: 260px;
    background: radial-gradient(ellipse at center,
        rgba(220, 38, 38, 0.35) 0%,
        rgba(232, 184, 90, 0.15) 35%,
        transparent 70%);
    filter: blur(60px);
    z-index: 0;
    animation: glowPulse 3s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.7; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.18); }
}

.brand-logo-img {
    position: relative;
    z-index: 1;
    height: 200px;
    width: auto;
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    filter: drop-shadow(0 8px 24px rgba(220, 38, 38, 0.5))
            drop-shadow(0 0 20px rgba(232, 184, 90, 0.3));
    transition: var(--transition);
}

.brand-logo-img:hover {
    transform: translateY(-3px) scale(1.03);
    filter: drop-shadow(0 12px 32px rgba(220, 38, 38, 0.65))
            drop-shadow(0 0 32px rgba(232, 184, 90, 0.5));
}

.brand-content {
    max-width: 880px;
    margin: 0 auto;
    text-align: center;
}

.brand-text {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 56px;
}

.brand-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.brand-feature {
    text-align: left;
    padding: 32px;
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.brand-feature:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-dim);
    border-radius: 14px;
    color: var(--accent);
    margin-bottom: 20px;
}

.brand-feature h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.brand-feature p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ---------- 产品矩阵 ---------- */
.products {
    padding: 120px 0;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.product-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.product-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-6px);
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.4);
}

.product-visual {
    position: relative;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background: #14141c;
}

.product-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
}

.product-card:hover .product-visual img {
    transform: scale(1.06);
}

.product-visual::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0) 60%, rgba(0,0,0,0.35) 100%);
    pointer-events: none;
}

.product-card:hover .product-screen {
    box-shadow:
        0 0 60px rgba(232, 184, 90, 0.15),
        inset 0 0 80px rgba(232, 184, 90, 0.06);
    border-color: rgba(232, 184, 90, 0.3);
}

.product-label-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: var(--gradient-gold);
    color: #1a1a22;
    font-size: 11px;
    font-weight: 700;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.product-info {
    padding: 28px;
}

.product-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--accent);
    padding: 3px 10px;
    background: var(--accent-dim);
    border-radius: 4px;
    margin-bottom: 12px;
    font-weight: 500;
}

.product-info h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
}

.product-info p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}

.product-specs {
    display: flex;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.product-specs span {
    font-size: 13px;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
}

/* ---------- 核心技术 ---------- */
.tech {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 24px;
}

.tech-card {
    position: relative;
    padding: 40px;
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s var(--ease);
}

.tech-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

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

.tech-number {
    position: absolute;
    top: 32px;
    right: 32px;
    font-size: 56px;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.04);
    font-family: 'Inter', sans-serif;
    line-height: 1;
}

.tech-icon {
    color: var(--accent);
    margin-bottom: 24px;
}

.tech-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.tech-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tech-tags span {
    padding: 4px 12px;
    background: rgba(232, 184, 90, 0.08);
    border: 1px solid rgba(232, 184, 90, 0.15);
    border-radius: 6px;
    font-size: 12px;
    color: var(--accent-bright);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
}

/* ---------- 应用场景 ---------- */
.scenes {
    padding: 120px 0;
}

.scene-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.scene-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-height: 360px;
    display: flex;
    align-items: flex-end;
    cursor: pointer;
    transition: var(--transition);
}

.scene-card:hover { transform: translateY(-4px); }

/* 场景背景 — AI 生成实景图，cover 铺满 */
.scene-home {
    background-image: url('../images/scene-home.webp');
    background-size: cover;
    background-position: center;
}

.scene-business {
    background-image: url('../images/scene-business.webp');
    background-size: cover;
    background-position: center;
}

.scene-education {
    background-image: url('../images/scene-education.webp');
    background-size: cover;
    background-position: center;
}

.scene-outdoor {
    background-image: url('../images/scene-outdoor.webp');
    background-size: cover;
    background-position: center;
}

.scene-image {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.scene-card:hover .scene-image {
    transform: scale(1.06);
}

.scene-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(10, 10, 18, 0.15) 0%, rgba(10, 10, 18, 0.45) 50%, rgba(10, 10, 18, 0.92) 100%),
        radial-gradient(ellipse at 50% 30%, transparent 0%, rgba(0, 0, 0, 0.25) 100%);
    z-index: 1;
    pointer-events: none;
}

.scene-content {
    position: relative;
    z-index: 2;
    padding: 32px;
}

.scene-label {
    display: block;
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--accent);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    margin-bottom: 8px;
}

.scene-content h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.scene-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 480px;
}

/* ---------- 品牌视频 ---------- */
.videos {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.video-grid {
    display: grid;
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
    gap: 20px;
}

.video-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.video-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
}

.video-card:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* 主推视频：单卡全宽居中，影院级超宽比例 */
.video-card-featured {
    grid-row: span 1;
    width: 100%;
    margin: 0 auto;
    aspect-ratio: 21 / 9;
}

/* 底部横条视频：占两列 */
.video-card-wide { grid-column: span 2; }

.video-poster {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.video-card:hover .video-poster { transform: scale(1.06); }

.video-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(10, 10, 18, 0.1) 0%, rgba(10, 10, 18, 0.5) 65%, rgba(10, 10, 18, 0.94) 100%);
    z-index: 1;
    pointer-events: none;
}

.video-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 68px;
    height: 68px;
    border-radius: 50%;
    background: var(--gradient-gold);
    color: #1a1a22;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    box-shadow: 0 4px 28px rgba(232, 184, 90, 0.45);
    transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.video-play svg { margin-left: 3px; }

.video-play-sm { width: 48px; height: 48px; }

.video-card:hover .video-play {
    transform: translate(-50%, -50%) scale(1.12);
    box-shadow: 0 8px 40px rgba(232, 184, 90, 0.6);
}

.video-info {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    padding: 20px 24px;
}

.video-card-featured .video-info { padding: 28px 32px; }

.video-tag {
    display: block;
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--accent);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.video-info h3 {
    font-size: 19px;
    font-weight: 700;
}

.video-card-featured .video-info h3 { font-size: 26px; }

.video-card-featured .video-info p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-top: 8px;
    max-width: 520px;
}

/* ---------- 视频播放弹窗 ---------- */
.video-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

.video-modal.active { display: flex; }

.video-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(5, 5, 10, 0.9);
    backdrop-filter: blur(8px);
}

.video-modal-body {
    position: relative;
    width: min(960px, 92vw);
    z-index: 1;
    animation: fadeInUp 0.35s var(--ease);
}

.video-modal-stage {
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-hover);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-modal-stage video,
.video-modal-stage iframe {
    width: 100%;
    height: 100%;
    display: block;
    border: 0;
}

.video-modal-stage video { object-fit: contain; }

.video-modal-placeholder {
    padding: 48px 24px;
    text-align: center;
    color: var(--text-secondary);
}

.video-modal-placeholder svg {
    color: var(--accent);
    opacity: 0.75;
    margin: 0 auto 16px;
}

.video-modal-placeholder h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.video-modal-placeholder p { font-size: 14px; }

.video-modal-close {
    position: absolute;
    top: -52px;
    right: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.video-modal-close:hover {
    background: rgba(232, 184, 90, 0.2);
    border-color: var(--border-hover);
    color: var(--accent-bright);
}

/* ---------- 关于企业 ---------- */
.about {
    padding: 120px 0;
}

.about-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    align-items: start;
}

.about-left .section-label,
.about-left .section-title { text-align: center; }

.about-left .section-title { margin-bottom: 24px; }

.about-text {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 20px;
}

/* 公司简介：居中弱化展示 */
.about-brief {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.9;
    max-width: 720px;
    margin: 0 auto 28px;
    text-align: center;
}

/* 品牌支柱：三等分横排，图标在上文字居中 */
.about-pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 8px;
}

.about-pillar {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 14px;
    padding: 28px 24px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    transition: var(--transition);
}

.about-pillar:hover {
    background: var(--bg-card);
    border-color: var(--border);
    transform: translateY(-4px);
}

.pillar-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--accent-dim);
    color: var(--accent);
}

.pillar-text h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.pillar-text p {
    font-size: 13.5px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-wrapper > .about-highlights {
    grid-column: 1 / -1;
    margin-top: 24px;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    margin-top: 24px;
}

.about-highlight {
    padding: 24px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.about-highlight:hover {
    border-color: var(--accent-dim);
    transform: translateY(-2px);
}

.highlight-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent);
    font-family: 'Inter', sans-serif;
    line-height: 1;
}

.highlight-num .plus {
    font-size: 22px;
    color: var(--accent);
    margin-left: 4px;
    font-weight: 600;
    vertical-align: baseline;
    position: relative;
    top: -2px;
}

.highlight-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ---------- 预约安装服务 ---------- */
.service {
    padding: 120px 0;
}

.service-flow {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 56px;
}

.service-step {
    position: relative;
    padding: 32px 24px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
    overflow: hidden;
}

.service-step::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-gold);
    opacity: 0;
    transition: opacity 0.3s var(--ease);
    pointer-events: none;
    z-index: 0;
}

.service-step:hover {
    border-color: var(--accent-dim);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(232, 184, 90, 0.12);
}

.service-step > * { position: relative; z-index: 1; }

.step-num {
    position: absolute;
    top: 18px;
    right: 22px;
    font-family: 'Inter', sans-serif;
    font-size: 42px;
    font-weight: 800;
    color: var(--accent-dim);
    opacity: 0.45;
    line-height: 1;
    letter-spacing: -2px;
    z-index: 0;
    transition: opacity 0.3s var(--ease);
}

.service-step:hover .step-num { opacity: 0.75; }

.step-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: rgba(232, 184, 90, 0.1);
    color: var(--accent);
    transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.service-step:hover .step-icon {
    background: var(--gradient-gold);
    color: #1a1a22;
}

.service-step h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.service-step p {
    font-size: 13.5px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.service-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 40px 48px;
    background:
        linear-gradient(135deg, rgba(232, 184, 90, 0.08) 0%, rgba(232, 184, 90, 0.02) 100%),
        var(--bg-card);
    border: 1px solid var(--accent-dim);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.service-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, rgba(232, 184, 90, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.service-cta-text { position: relative; z-index: 1; }

.service-cta-text h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.service-cta-text p {
    font-size: 14px;
    color: var(--text-secondary);
}

.service-cta-actions {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

/* ---------- 联系合作 ---------- */
.contact {
    padding: 120px 0;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.contact-left .section-label,
.contact-left .section-title { text-align: left; }

.contact-left .section-title { margin-bottom: 20px; }

.contact-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 24px;
    max-width: 480px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 20px;
}

.method-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-dim);
    border-radius: 12px;
    color: var(--accent);
    flex-shrink: 0;
}

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

.method-label {
    font-size: 13px;
    color: var(--text-muted);
}

.method-value {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
}

/* 联系表单 */
.contact-form {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 28px;
}

/* 联系区二维码卡片 */
.contact-qr-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 44px 40px;
}

.contact-qr-card h3 {
    margin-bottom: 28px;
}

.qr-frame-lg {
    padding: 14px;
    border-radius: 14px;
}

.qr-frame-lg .qr-img {
    width: 220px;
    height: 220px;
}

.qr-card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 24px;
    letter-spacing: 1px;
}

.contact-qr-card .qr-tags {
    margin-top: 14px;
}

/* ---------- Footer ---------- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 64px 0 32px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 48px;
    align-items: start;
}

.qr-frame {
    position: relative;
    padding: 10px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

.qr-img {
    display: block;
    width: 128px;
    height: 128px;
    border-radius: 6px;
}

/* 四角取景框 — 呼应"扫描"意象 */
.qr-corner {
    position: absolute;
    width: 14px;
    height: 14px;
    pointer-events: none;
}

.qr-corner::before,
.qr-corner::after {
    content: '';
    position: absolute;
    background: #e8b85a;
    border-radius: 2px;
}

.qr-corner::before { width: 100%; height: 2px; }
.qr-corner::after { width: 2px; height: 100%; }

.qr-tl { top: -6px; left: -6px; }
.qr-tl::before, .qr-tl::after { top: 0; left: 0; }

.qr-tr { top: -6px; right: -6px; }
.qr-tr::before { top: 0; right: 0; }
.qr-tr::after { top: 0; right: 0; }

.qr-bl { bottom: -6px; left: -6px; }
.qr-bl::before { bottom: 0; left: 0; }
.qr-bl::after { bottom: 0; left: 0; }

.qr-br { bottom: -6px; right: -6px; }
.qr-br::before { bottom: 0; right: 0; }
.qr-br::after { bottom: 0; right: 0; }

.qr-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 14px;
    width: 100%;
}

.qr-tag {
    flex: 0 0 auto;
    font-size: 11px;
    color: #e8b85a;
    padding: 4px 11px;
    border: 1px solid rgba(232, 184, 90, 0.35);
    border-radius: 100px;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.footer-brand p {
    font-size: 16px;
    font-weight: 500;
    color: var(--accent-bright);
    letter-spacing: 0.1em;
    line-height: 1.6;
    margin-top: 20px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-col a:hover { color: var(--accent); }

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.footer-icp { font-size: 12px !important; }

.footer-icp a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-icp a:hover {
    color: var(--accent-bright);
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--accent);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    border-color: var(--border-hover);
    background: var(--bg-elevated);
}

/* ---------- 浮动分享按钮 ---------- */
.share-fab {
    position: fixed;
    right: 24px;
    bottom: 88px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-gold);
    border: none;
    border-radius: 50%;
    color: #1a1a22;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(232, 184, 90, 0.35), 0 2px 6px rgba(0, 0, 0, 0.3);
    z-index: 998;
    transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.share-fab:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 24px rgba(232, 184, 90, 0.5), 0 2px 8px rgba(0, 0, 0, 0.35);
}

.share-fab .share-fab-close { display: none; }
.share-fab.is-open .share-fab-icon { display: none; }
.share-fab.is-open .share-fab-close { display: block; }
.share-fab.is-open { transform: rotate(90deg); }
.share-fab.is-open:hover { transform: rotate(90deg) scale(1.05); }

/* ---------- 分享弹层 ---------- */
.share-panel {
    position: fixed;
    right: 24px;
    bottom: 152px;
    width: 300px;
    background: var(--bg-card);
    border: 1px solid var(--accent-dim);
    border-radius: 16px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(232, 184, 90, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.96);
    transform-origin: bottom right;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
    z-index: 997;
}

.share-panel.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.share-panel-inner {
    padding: 22px 22px 18px;
    text-align: center;
}

.share-panel-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-bright);
    letter-spacing: 0.08em;
    margin-bottom: 4px;
}

.share-panel-header p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

/* 二维码框架 + 四角装饰 */
.share-panel-qr {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 18px auto 16px;
    padding: 8px;
    background: #fff;
    border-radius: 10px;
}

.share-panel-qr .qr-frame {
    width: 100%;
    height: 100%;
    overflow: hidden;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.share-panel-qr .qr-frame img {
    width: 100%;
    height: 100%;
    display: block;
}

.qr-deco {
    position: absolute;
    width: 18px;
    height: 18px;
    border: 3px solid var(--accent);
}
.qr-tl { top: -3px; left: -3px; border-right: none; border-bottom: none; border-top-left-radius: 6px; }
.qr-tr { top: -3px; right: -3px; border-left: none; border-bottom: none; border-top-right-radius: 6px; }
.qr-bl { bottom: -3px; left: -3px; border-right: none; border-top: none; border-bottom-left-radius: 6px; }
.qr-br { bottom: -3px; right: -3px; border-left: none; border-top: none; border-bottom-right-radius: 6px; }

/* 分享按钮组 */
.share-panel-actions {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.share-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    background: transparent;
    border: 1px solid var(--accent);
    border-radius: 10px;
    color: var(--accent);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.share-btn:hover {
    background: var(--accent-dim);
}

.share-btn:active {
    transform: scale(0.97);
}

.share-btn-primary {
    background: var(--gradient-gold);
    color: #1a1a22;
    border-color: transparent;
}

.share-btn-primary:hover {
    background: var(--gradient-gold);
    filter: brightness(1.1);
}

.share-tip {
    min-height: 18px;
    margin: 12px 0 0;
    font-size: 12px;
    color: var(--accent-bright);
    opacity: 0;
    transition: opacity 0.2s var(--ease);
}

.share-tip.is-show { opacity: 1; }

/* ---------- 浮动投影计算工具 ---------- */
.calc-fab {
    position: fixed;
    right: 24px;
    bottom: 144px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-gold);
    border: none;
    border-radius: 50%;
    color: #1a1a22;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(232, 184, 90, 0.35), 0 2px 6px rgba(0, 0, 0, 0.3);
    z-index: 998;
    transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.calc-fab:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 24px rgba(232, 184, 90, 0.5), 0 2px 8px rgba(0, 0, 0, 0.35);
}

.calc-fab .calc-fab-close { display: none; }
.calc-fab.is-open .calc-fab-icon { display: none; }
.calc-fab.is-open .calc-fab-close { display: block; }
.calc-fab.is-open { transform: rotate(90deg); }
.calc-fab.is-open:hover { transform: rotate(90deg) scale(1.05); }

/* 计算面板 */
.calc-panel {
    position: fixed;
    right: 24px;
    bottom: 208px;
    width: 320px;
    max-height: calc(100vh - 232px);
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--accent-dim);
    border-radius: 16px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(232, 184, 90, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.96);
    transform-origin: bottom right;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
    z-index: 997;
}

.calc-panel.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.calc-panel-inner {
    padding: 20px 20px 16px;
    overflow-y: auto;
    overflow-x: hidden;
    /* 滚动条美化 */
    scrollbar-width: thin;
    scrollbar-color: var(--accent-dim) transparent;
}

.calc-panel-inner::-webkit-scrollbar { width: 6px; }
.calc-panel-inner::-webkit-scrollbar-track { background: transparent; }
.calc-panel-inner::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 3px; }
.calc-panel-inner::-webkit-scrollbar-thumb:hover { background: var(--accent); }

.calc-panel-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-bright);
    letter-spacing: 0.08em;
    margin-bottom: 4px;
}

.calc-panel-header p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0 0 14px;
}

/* 标签页 */
.calc-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    padding: 4px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 10px;
    border: 1px solid var(--border);
}

.calc-tab {
    flex: 1;
    padding: 8px 4px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.calc-tab.is-active {
    background: var(--gradient-gold);
    color: #1a1a22;
    font-weight: 600;
}

/* 计算表单 */
.calc-body { display: none; }
.calc-body.is-active { display: block; }

.calc-field {
    margin-bottom: 12px;
}

.calc-field label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.calc-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.calc-input-wrap input,
.calc-select {
    width: 100%;
    padding: 10px 58px 10px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

/* 原生下拉列表暗色适配：Windows 下拉默认白底，显式指定暗底浅字保证 4 个选项都可读 */
.calc-select option {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.calc-input-wrap input:focus,
.calc-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(232, 184, 90, 0.12);
}

.calc-input-wrap input[type="number"]::-webkit-inner-spin-button,
.calc-input-wrap input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
}

.calc-unit {
    position: absolute;
    right: 12px;
    font-size: 12px;
    color: var(--text-muted);
    pointer-events: none;
}

.calc-select {
    appearance: none;
    -webkit-appearance: none;
    padding-right: 36px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    cursor: pointer;
}

.calc-hint {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
}

.calc-submit {
    width: 100%;
    margin-top: 4px;
    padding: 12px;
    background: var(--gradient-gold);
    border: none;
    border-radius: 10px;
    color: #1a1a22;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.2s var(--ease), transform 0.2s var(--ease);
}

.calc-submit:hover { filter: brightness(1.1); }
.calc-submit:active { transform: scale(0.98); }

/* 计算结果 */
.calc-result {
    margin-top: 14px;
    padding: 12px;
    background: rgba(232, 184, 90, 0.06);
    border: 1px solid var(--accent-dim);
    border-radius: 10px;
}

.calc-result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.calc-result-row:last-child { border-bottom: none; }

.calc-result-label {
    font-size: 13px;
    color: var(--text-muted);
}

.calc-result-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-bright);
    letter-spacing: 0.02em;
}

.calc-note {
    margin: 14px 0 0;
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
    text-align: center;
}

/* ---------- 滚动动画 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Keyframes ---------- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* ============================================
   响应式 — 平板
   ============================================ */
@media (max-width: 900px) {
    /* 产品矩阵/核心技术改为 auto-fill 自适应列数，不再在此强制改列 */
    .about-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .contact-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .footer-top { grid-template-columns: 1fr; gap: 40px; }
    .contact-qr-card { max-width: 360px; margin: 0 auto; }

    /* 品牌视频：单卡全宽 */
    .video-grid { grid-template-columns: 1fr; }
    .video-card-featured { grid-column: span 1; aspect-ratio: 16 / 9; }
}

/* ============================================
   响应式 — 手机
   ============================================ */
@media (max-width: 768px) {
    :root { --nav-height: 76px; }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px;
        gap: 8px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-150%);
        transition: transform 0.4s var(--ease);
    }

    .nav-menu.active { transform: translateY(0); }

    .nav-actions { display: none; }
    .nav-toggle { display: flex; }
    .nav-lang-item { margin: 12px 0 4px; justify-content: center; }

    .logo-img { height: 56px; padding: 0; }
    .brand-logo-showcase { padding: 40px 40px; margin-bottom: 48px; }
    .brand-logo-img { height: 140px; padding: 0; }

    .logo-glow { width: 360px; height: 180px; }

    .hero { padding: 100px 20px 60px; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }
    .hero-scroll { display: none; }

    .brand, .products, .tech, .scenes, .about, .videos, .contact {
        padding: 80px 0;
    }

    /* 品牌视频：单列堆叠 */
    .video-grid { grid-template-columns: 1fr; grid-auto-rows: auto; gap: 16px; }
    .video-card { aspect-ratio: 16 / 9; }
    .video-card-featured, .video-card-wide { grid-column: span 1; }
    .video-play { width: 56px; height: 56px; }
    .video-card-featured .video-info h3 { font-size: 20px; }
    .video-info h3 { font-size: 17px; }
    .video-modal-close { top: -48px; width: 36px; height: 36px; }

    .brand-features { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .scene-grid { grid-template-columns: 1fr; }
    .scene-card { min-height: 280px; }
    .about-highlights { grid-template-columns: repeat(3, 1fr); }
    .about-pillars { grid-template-columns: 1fr; gap: 12px; }
    .about-pillar { padding: 22px 20px; }
    .footer-links { grid-template-columns: 1fr; gap: 24px; }
    .footer-top { grid-template-columns: 1fr; }
    .contact-qr-card { max-width: 100%; }

    .contact-form { padding: 28px; }
    .tech-card { padding: 28px; }
    .brand-feature { padding: 24px; }

    .service-flow { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .service-step { padding: 28px 20px 24px; }
    .step-num { font-size: 32px; top: 14px; right: 18px; }
    .service-cta { flex-direction: column; align-items: stretch; text-align: center; padding: 32px 24px; }
    .service-cta-actions { justify-content: center; flex-wrap: wrap; }

    .back-to-top { bottom: 20px; right: 20px; }

    .share-fab { right: 20px; bottom: 80px; width: 44px; height: 44px; }
    .share-fab svg { width: 20px; height: 20px; }
    .share-panel { right: 16px; bottom: 132px; width: calc(100vw - 32px); max-width: 300px; }
    .share-panel-qr { width: 180px; height: 180px; }

    .calc-fab { right: 20px; bottom: 136px; width: 44px; height: 44px; }
    .calc-fab svg { width: 20px; height: 20px; }
    .calc-panel { right: 16px; bottom: 188px; width: calc(100vw - 32px); max-width: 300px; }
    .calc-panel-inner { padding: 18px 18px 14px; }
}

@media (max-width: 480px) {
    .about-highlights { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn-primary,
    .hero-actions .btn-ghost { width: 100%; justify-content: center; }
}