/* ==========================================================================
   Design Tokens (single source of truth)
   Brand: Grid Connect Technology — primary cyan #0891B2
   ========================================================================== */
:root {
    /* Brand & ink — Figma Grid / Color (gcTech-Web-v2) */
    --color-primary: #0891B2;       /* brand/primary */
    --color-primary-dark: #067089;  /* brand/primary-dark */
    --color-primary-soft: #ECFEFF;  /* brand/primary-soft */
    --color-primary-rgb: 8, 145, 178;
    --color-accent: #22D3EE;        /* brand/accent */
    --color-ink: #0F172A;           /* ink/primary */
    --color-ink-2: #155E75;
    --color-chip: #F1F5F9;
    --color-chip-text: #475569;

    /* Neutral text & surfaces */
    --color-text: #1E293B;
    --color-text-muted: #64748B;    /* ink/muted */
    --color-text-soft: #94A3B8;
    --color-border: #E2E8F0;        /* border/subtle */
    --color-border-soft: rgba(15, 23, 42, 0.04);
    --color-bg: #FFFFFF;            /* surface/card */
    --color-bg-alt: #F8FAFC;        /* surface/page */

    /* Page banners — Figma Shared UI Page Banner is 140px; home is taller */
    --page-banner-height: 180px;
    --page-banner-height-md: 160px;
    --page-banner-height-sm: 140px;
    --home-banner-height: 520px;
    --home-banner-height-md: 440px;
    --home-banner-height-sm: 380px;

    /* Radius — Figma Grid / Space + Shared UI button 10px */
    --radius-sm: 8px;               /* radius/sm */
    --radius-btn: 10px;
    --radius-md: 14px;              /* radius/md */
    --radius-lg: 20px;              /* radius/lg */
    --radius-card: 16px;
    --radius-pill: 999px;

    /* Elevation — Figma Home cards: 0 2px 12px / soft soft */
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.06);
    --shadow-card: 0 8px 20px rgba(0, 0, 0, 0.08); /* Figma ProductCard */
    --shadow-lg: 0 12px 32px rgba(var(--color-primary-rgb), 0.14), 0 4px 12px rgba(15, 23, 42, 0.06);

    /* Spacing rhythm — Figma Grid / Space */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 20px;
    --space-lg: 32px;
    --space-xl: 48px;
    --section-pad: 80px;
    --page-gutter: clamp(24px, 5vw, 120px);

    /* Typography — Figma gcTech-Web-Typography v2026-08 */
    --fs-display: clamp(2.25rem, 3.2vw, 2.75rem);   /* 36–44 */
    --fs-h1: clamp(1.75rem, 2.4vw, 2.125rem);       /* page banner */
    --fs-h2: clamp(1.35rem, 1.8vw, 1.625rem);       /* series title ~22–26 */
    --fs-h3: 1.1875rem;                             /* card title 19 */
    --fs-body: 1rem;                                /* 16 — body readable */
    --fs-sm: 0.9375rem;                             /* 15 */
    --fs-xs: 0.8125rem;                             /* 13 */
    --fs-label: 0.75rem;                            /* 12 — badge / meta */
    --lh-tight: 1.25;
    --lh-snug: 1.45;
    --lh-body: 1.7;
    --tracking-tight: -0.02em;
    --tracking-ui: 0.01em;
    --font-sans: "Noto Sans SC", "DM Sans", "Segoe UI", "Microsoft YaHei", sans-serif;
    --font-display: "Noto Sans SC", "DM Sans", "Segoe UI", "Microsoft YaHei", sans-serif;

    /* Motion */
    --ease: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    --lift: translateY(-6px);
}

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

body {
    font-family: var(--font-sans);
    font-size: var(--fs-body);
    line-height: var(--lh-body);
    color: var(--color-text);
    background: var(--color-bg-alt);
    padding-top: 88px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: var(--tracking-tight);
    line-height: var(--lh-tight);
    color: var(--color-ink);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 600; }

html {
    scroll-behavior: smooth;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--page-gutter);
}

/* Shared UI — Button/Primary */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: #fff;
    padding: 12px 22px;
    border-radius: var(--radius-btn);
    border: 1.5px solid transparent;
    transition: background var(--ease), transform var(--ease), box-shadow var(--ease), border-color var(--ease), color var(--ease);
    font-weight: 600;
    font-size: var(--fs-sm);
    letter-spacing: 0.01em;
    line-height: 1.2;
}

.btn:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(var(--color-primary-rgb), 0.32);
}

/* Shared UI — Button/Secondary */
.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
    box-shadow: none;
}

/* Shared UI — Button/Ghost */
.btn-ghost {
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
    border-color: transparent;
}

.btn-ghost:hover {
    background: #cffafe;
    color: var(--color-primary-dark);
    box-shadow: none;
}

.btn:focus-visible,
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-size: var(--fs-h2);
    font-weight: 700;
    letter-spacing: -0.02em;
    position: relative;
    padding-bottom: 16px;
    color: var(--color-ink);
}

.section-title::after {
    content: '';
    position: absolute;
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

section {
    padding: var(--section-pad) 0;
    position: relative;
    overflow: hidden;
    margin: 0;
}

/* Site header (not section headers inside pages) */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    box-shadow: 0 1px 0 var(--color-border), 0 8px 24px rgba(15, 23, 42, 0.04);
    z-index: 1000;
    height: 76px;
    min-height: 76px;
}

.site-header .container,
.site-header .header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 20px;
    position: relative;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    z-index: 1002;
}

.nav-toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background: #333;
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 999;
}

body.nav-open {
    overflow: hidden;
}

.site-nav ul {
    display: flex;
    align-items: center;
}

.nav-cta {
    margin-left: 18px !important;
}

.btn-nav-cta {
    padding: 8px 16px !important;
    font-size: var(--fs-xs) !important;
    letter-spacing: var(--tracking-ui);
    border-radius: 10px;
    background: var(--color-primary) !important;
    color: #fff !important;
    font-weight: 600;
}

.btn-nav-cta:hover {
    background: var(--color-primary-dark) !important;
    color: #fff !important;
}

.btn-nav-cta::after {
    display: none !important;
}

.site-header.is-scrolled {
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 1px 0 var(--color-border), 0 10px 28px rgba(15, 23, 42, 0.06);
}

.logo {
    display: flex;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 48px;
    width: auto;
    max-height: 48px;
    min-height: 48px;
    margin-right: 12px;
    object-fit: contain;
}

.logo h1 {
    font-size: 1.125rem;
    letter-spacing: var(--tracking-tight);
    color: var(--color-primary);
    white-space: nowrap;
    font-weight: 700;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 28px;
}

nav ul li a {
    font-size: var(--fs-sm);
    font-weight: 500;
    letter-spacing: var(--tracking-ui);
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--color-primary);
}

nav ul li a.active {
    color: var(--color-primary);
    font-weight: 600;
    position: relative;
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: calc(100vh - 100px);
    margin-top: -100px;
    padding-top: 100px;
    background: radial-gradient(ellipse at 30% 20%, rgba(var(--color-primary-rgb), 0.15) 0%, transparent 50%),
                linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1518770660439-4636190af475?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    color: #fff;
    display: flex;
    align-items: center;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-content h2 {
    font-size: var(--fs-display);
    font-weight: 700;
    letter-spacing: var(--tracking-tight);
    line-height: var(--lh-tight);
    margin-bottom: 16px;
}

.hero-content p.hero-subtitle {
    font-size: var(--fs-body);
    line-height: var(--lh-snug);
    margin-bottom: 28px;
    opacity: 0;
    transform: translateY(10px);
    animation: heroSubtitleIn 0.6s ease-out 0.3s forwards;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 10px;
}

@keyframes heroSubtitleIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* About Section */
.about {
    background: #f9f9f9;
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: start;
}

.about-text p {
    margin-bottom: 16px;
    font-size: 15px;
    color: #555;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 20px;
}

.stat-item {
    text-align: center;
    padding: 16px 10px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    transition: transform 0.2s;
}

.stat-item:hover {
    transform: translateY(-2px);
}

.stat-item i {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    font-size: 22px;
    color: var(--color-primary);
    margin-bottom: 10px;
    background: rgba(var(--color-primary-rgb), 0.08);
    border-radius: 50%;
}

.stat-item h3 {
    font-size: 28px;
    margin-bottom: 4px;
    color: var(--color-primary);
    font-weight: 700;
}

.stat-item p {
    font-size: 13px;
    color: #888;
}

/* Products Section */
.products-grid,
.products-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px; /* 减小产品卡片间距 */
    margin: 0;
    padding: 15px 0;
}

.product-card,
.preview-item {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 28px 22px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(0,0,0,0.04);
}

.product-card:hover,
.preview-item:hover {
    transform: var(--lift);
    box-shadow: var(--shadow-lg);
}

.product-icon {
    font-size: 42px;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.product-card h3,
.preview-item h3 {
    margin-bottom: 12px;
    font-size: 20px;
    color: var(--color-ink);
}

.preview-item p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 18px;
}

/* 带图片的preview卡片 */
.preview-item--photo {
    padding: 0 0 24px 0;
    overflow: hidden;
}

.preview-item--photo .preview-thumb {
    width: 100%;
    height: 160px;
    object-fit: contain;
    background: linear-gradient(145deg, #f0f9ff 0%, #e0f2fe 100%);
    display: block;
    margin-bottom: 16px;
}

.preview-item--photo h3,
.preview-item--photo p {
    padding: 0 22px;
}

/* Product Categories */
.product-categories {
    margin-bottom: 50px;
}

.category-heading {
    margin-bottom: 30px;
    position: relative;
}

.category-heading h3 {
    font-size: 26px;
    padding-left: 15px;
    position: relative;
}

.category-heading h3:before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 25px;
    background: var(--color-primary);
    border-radius: 3px;
}

/* IoT Products in Homepage */
.iot-products-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.product-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: #fff;
    border: 1px solid rgba(0,0,0,0.04);
}

.product-item:hover {
    transform: var(--lift);
    box-shadow: var(--shadow-lg);
}

.product-image {
    height: 200px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, #f0f9ff 0%, #e0f2fe 100%);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    padding: 8px;
    box-sizing: border-box;
    transition: transform 0.5s;
}

.product-item:hover .product-image img {
    transform: scale(1.1);
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.product-code {
    color: #777;
    margin-bottom: 15px;
    font-size: 14px;
}

/* 产品型号标签 */
.product-models {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.model-badge {
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    padding: 3px 8px;
    font-size: var(--fs-xs);
    font-weight: 500;
    transition: all 0.3s;
}

.model-badge:hover {
    background-color: var(--color-primary);
    color: white;
}

.product-features ul {
    margin-bottom: 20px;
}

.product-features li {
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
}

.product-features i {
    color: var(--color-primary);
    margin-right: 10px;
    font-size: 14px;
    margin-top: 4px;
}

.product-btn {
    width: 100%;
    text-align: center;
    margin-top: 15px;
}

.products-more {
    text-align: center;
    margin-top: 40px;
}

.products-more .btn {
    padding: 12px 30px;
}

/* Advantages Section */
.advantages {
    background: linear-gradient(rgba(0,0,0,0.8), rgba(0,0,0,0.8)), url('https://images.unsplash.com/photo-1531482615713-2afd69097998?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    color: #fff;
}

.advantages .section-title::after {
    background: #fff;
}

.advantages-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.advantage-item {
    text-align: center;
    padding: 15px; /* 减小优势卡片内边距 */
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,0.15);
    transition: background 0.3s, border-color 0.3s;
}

.advantage-item:hover {
    background: rgba(255,255,255,0.18);
    border-color: rgba(var(--color-primary-rgb), 0.5);
}

.advantage-item i {
    font-size: 36px; /* 减小图标大小 */
    margin-bottom: 12px;
    color: var(--color-primary);
}

.advantage-item h3 {
    margin-bottom: 12px;
    font-size: 20px;
}

/* Contact Section */
.contact {
    padding: 48px 0 56px;
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    align-items: start;
}

.contact-map {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.contact-map__head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 18px;
}

.contact-map__head h2 {
    margin: 0 0 6px;
    font-size: 24px;
}

.contact-map__head p {
    margin: 0;
    color: var(--color-text-muted);
}

.contact-map__links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: var(--fs-sm);
}

.contact-map__links a {
    color: var(--color-primary);
}

.contact-map__frame {
    min-height: 240px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-alt);
    box-shadow: var(--shadow-sm);
}

.contact-map__frame iframe {
    display: block;
    width: 100%;
    height: 240px;
    border: 0;
}

@media (max-width: 640px) {
    .contact-map__head {
        display: block;
    }

    .contact-map__links {
        margin-top: 14px;
    }
}

.contact-info {
    flex: 1 1 400px;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
}

.contact-item i {
    font-size: 24px;
    color: var(--color-primary);
    margin-right: 15px;
    margin-top: 5px;
    flex-shrink: 0;
}

.contact-item a {
    color: inherit;
    transition: color 0.3s;
}

.contact-item a:hover {
    color: var(--color-primary);
}

.contact-form {
    flex: 1 1 400px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 22px 20px;
    box-shadow: var(--shadow-sm);
}

.contact-form h3 {
    margin-bottom: 8px;
    color: var(--color-ink);
}

.contact-form__lead {
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    margin-bottom: 18px;
    line-height: 1.6;
}

.inquiry-hp {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.inquiry-form {
    position: relative;
}

.inquiry-flash {
    list-style: none;
    margin: 0 0 14px;
    padding: 0;
}

.inquiry-flash__item {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--fs-sm);
    margin-bottom: 8px;
}

.inquiry-flash__item--success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.inquiry-flash__item--error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.inquiry-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 12px;
}

.inquiry-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
}

.inquiry-field--full {
    margin-bottom: 10px;
}

.inquiry-field input,
.inquiry-field textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font: inherit;
    color: var(--color-ink);
    background: var(--color-bg);
}

.inquiry-field input:focus,
.inquiry-field textarea:focus {
    outline: 2px solid var(--color-primary-soft);
    border-color: var(--color-primary);
}

.inquiry-hint {
    font-size: var(--fs-xs, 0.8125rem);
    color: var(--color-text-muted);
    margin: 0 0 14px;
    line-height: 1.5;
}

@media (max-width: 640px) {
    .inquiry-grid {
        grid-template-columns: 1fr;
    }
}

.contact-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 22px;
}

.contact-cta-primary,
.contact-cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.page-breadcrumb {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
}

.page-breadcrumb__list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 4px;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 13px;
    color: var(--color-text-muted);
}

.page-breadcrumb__list li {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.page-breadcrumb__list li:not(:last-child)::after {
    content: '/';
    color: var(--color-text-soft);
    margin-left: 2px;
}

.page-breadcrumb__list a {
    color: var(--color-primary);
}

.page-breadcrumb__list a:hover {
    text-decoration: underline;
}

.page-breadcrumb__list span[aria-current="page"] {
    color: var(--color-ink);
    font-weight: 500;
}

.contact-channels {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.channel-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 16px 18px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: background 0.3s, transform 0.2s;
}

.channel-item:hover {
    background: #f0f8ff;
    transform: translateX(4px);
}

.channel-item i {
    font-size: 22px;
    color: var(--color-primary);
    margin-top: 2px;
    flex-shrink: 0;
    width: 28px;
    text-align: center;
}

.channel-item strong {
    display: block;
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 2px;
}

.channel-item p {
    margin: 0;
    color: #333;
    font-size: 1rem;
}

.channel-item a {
    color: var(--color-primary);
    font-weight: 500;
    transition: color 0.3s;
}

.channel-item a:hover {
    color: var(--color-primary-dark);
}

.contact-tip {
    margin-top: 20px;
    padding: 14px 18px;
    background: rgba(var(--color-primary-rgb), 0.08);
    border-radius: 8px;
    font-size: 0.9rem;
    color: #555;
    line-height: 1.6;
}

.contact-tip a {
    color: var(--color-primary);
    font-weight: 600;
}

.contact-tip a.btn:not(.btn-secondary) {
    color: #fff;
}

.contact-tip a.btn:not(.btn-secondary):hover {
    color: #fff;
}

/* Alias: secondary outline (non-hero) — matches Figma Button/Secondary */
.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1.5px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
}

/* Hero secondary — translucent pill (Figma Home CTA) */
.btn-outline-light {
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.9);
    border: 1.5px solid rgba(255, 255, 255, 0.5);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
}

/* Section lead text */
.section-lead {
    text-align: center;
    max-width: 720px;
    margin: -30px auto 40px;
    color: #666;
    font-size: 17px;
    line-height: 1.7;
}

/* Platform section (homepage) */
.platform-section {
    background: #f0f9ff;
}

.platform-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 36px;
}

.platform-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s;
}

.platform-card:hover {
    transform: var(--lift);
}

.platform-card i {
    font-size: 36px;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.platform-card h3 {
    margin-bottom: 10px;
    font-size: 20px;
}

.platform-card p {
    color: #666;
    font-size: 15px;
    line-height: 1.6;
}

.platform-actions {
    text-align: center;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.platform-actions .btn-outline {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.platform-actions .btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}

.platform-actions .btn-secondary {
    background: #fff;
    color: var(--color-primary-dark);
    border: 1px solid rgba(var(--color-primary-rgb), 0.35);
}

.platform-actions .btn-secondary:hover {
    background: rgba(var(--color-primary-rgb), 0.08);
    color: var(--color-primary-dark);
}

/* Product preview icons */
.preview-item > i {
    font-size: 42px;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.preview-item .btn {
    margin-top: auto;
}

.preview-thumb {
    width: 100%;
    height: 160px;
    object-fit: contain;
    object-position: center;
    border-radius: 10px;
    margin-bottom: 12px;
    background: linear-gradient(145deg, #f0f9ff, #e0f2fe);
    box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.1);
}

.preview-item--photo > i {
    display: none;
}

/* Footer */
footer {
    background: linear-gradient(180deg, #0F172A 0%, #0B1220 100%);
    color: #fff;
    padding: 52px 0 18px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1.2fr;
    gap: 32px;
    align-items: start;
    margin-bottom: 30px;
}

.footer-logo h2 {
    color: var(--color-primary);
    margin-bottom: 10px;
    font-size: 20px;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.6;
    max-width: 28em;
}

.footer-links__title {
    color: #fff;
    font-weight: 600;
    margin-bottom: 12px !important;
    font-size: 14px;
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.72);
    font-size: 14px;
    transition: color var(--ease);
}

.footer-links a:hover {
    color: var(--color-accent, #22D3EE);
}

.footer-cta {
    display: inline-block;
    margin-top: 8px;
    color: var(--color-accent, #22D3EE) !important;
    font-weight: 600;
}

.footer-social {
    display: none;
}

.footer-logo p {
    font-size: 14px;
    color: rgba(255,255,255,0.8);
}

.footer-bottom p {
    font-size: 12px;
    color: rgba(255,255,255,0.7);
}

.footer-bottom a {
    color: rgba(255,255,255,0.8);
    transition: color 0.3s;
}

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

.footer-social {
    display: flex;
    gap: 20px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    transition: background 0.3s;
}

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

.footer-social i {
    font-size: 20px;
}

.footer-contact p {
    margin: 6px 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.85);
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.85);
    transition: color 0.3s;
}

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

.footer-contact i {
    margin-right: 8px;
    color: var(--color-primary);
    width: 18px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive Design */
@media (max-width: 1024px) {
    body {
        padding-top: 100px;
    }
    
    .site-header {
        height: 70px;
    }
    
    .logo-img {
        height: 56px;
        max-height: 56px;
        min-height: 56px;
    }
    
    .hero {
        min-height: calc(100vh - 70px);
        margin-top: -70px;
        padding-top: 70px;
    }
}

@media (max-width: 992px) {
    body {
        padding-top: 90px;
    }

    .site-header {
        height: 70px;
        min-height: 70px;
    }

    .site-header .header-inner {
        min-height: 70px;
    }

    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
        z-index: 1001;
    }

    .site-nav.is-open {
        max-height: 420px;
    }

    .site-nav ul {
        flex-direction: column;
        padding: 12px 0 16px;
    }

    .site-nav ul li {
        margin: 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .site-nav ul li:last-child {
        border-bottom: none;
    }

    .site-nav ul li a {
        display: block;
        padding: 14px 24px;
        color: #333;
    }

    .site-nav ul li a.active::after {
        display: none;
    }

    .site-nav ul li a.active {
        background: #f0f9ff;
    }

    .hero {
        min-height: calc(100vh - 70px);
        margin-top: -70px;
        padding-top: 70px;
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 80px;
    }

    .site-header {
        min-height: 70px;
        height: 70px;
    }

    .product-filter {
        top: 70px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .nav-cta {
        margin: 12px 16px !important;
    }

    .btn-nav-cta {
        display: block;
        text-align: center;
        width: calc(100% - 0px);
    }

    .site-header .container,
    .site-header .header-inner {
        flex-direction: row;
        padding: 0 16px;
        min-height: 70px;
    }

    .logo {
        margin-bottom: 0;
    }

    .logo-img {
        height: 40px;
        max-height: 40px;
        min-height: 40px;
    }

    nav ul {
        flex-wrap: nowrap;
    }

    nav ul li {
        margin: 0;
    }

    .hero {
        min-height: calc(100vh - 80px);
        margin-top: -80px;
        padding-top: 80px;
    }

    .about-content,
    .products-preview,
    .advantages-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    section {
        padding: 36px 0;
    }
    
    .hero-content h2 {
        font-size: 28px;
    }
    
    .hero-content p.hero-subtitle {
        font-size: 15px;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 30px;
    }

    .stat-item {
        padding: 12px 8px;
    }
}

@media (max-width: 480px) {
    body {
        padding-top: 80px;
    }

    .site-header {
        min-height: 70px;
        height: auto;
        background: #fff;
        box-shadow: 0 2px 12px rgba(0,0,0,0.12);
    }
    
    .site-header .container {
        min-height: 70px;
        padding: 10px 16px;
    }
    
    .header-inner .container,
    .header-inner {
        min-height: 70px !important;
    }
    
    .logo-img {
        height: 42px;
        max-height: 42px;
        min-height: 42px;
    }
    
    .hero {
        min-height: calc(100vh - 80px);
        margin-top: -80px;
        padding-top: 80px;
    }
    
    section {
        padding: 30px 0;
    }
    
    .products-grid,
    .products-preview {
        grid-template-columns: 1fr;
    }
    
    .hero-content h2 {
        font-size: 24px;
    }

    .hero-content p {
        font-size: 14px;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 30px;
    }

    .site-nav {
        top: 70px;
    }

    .site-nav ul li a {
        padding: 12px 20px;
        font-size: 14px;
    }
}

/* 返回顶部按钮（公共 footer 使用） */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background 0.3s;
    z-index: 1000;
}
#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
#back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}
#back-to-top.visible:hover {
    transform: translateY(-3px);
}

/* Product assistant (Dify-backed) */
.gc-assistant {
    position: fixed;
    right: 24px;
    bottom: 88px;
    z-index: 1100;
    font-family: var(--font-sans);
}
.gc-assistant__fab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    border-radius: var(--radius-pill);
    background: var(--color-primary);
    color: #fff;
    padding: 12px 18px;
    font-size: var(--fs-sm);
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: background var(--ease), transform var(--ease);
}
.gc-assistant__fab:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}
.gc-assistant__panel {
    position: absolute;
    right: 0;
    bottom: 56px;
    width: min(380px, calc(100vw - 32px));
    height: min(520px, calc(100vh - 120px));
    min-width: 280px;
    min-height: 320px;
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 96px);
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}
.gc-assistant__panel[hidden] {
    display: none !important;
}
.gc-assistant__resize {
    position: absolute;
    z-index: 6;
    touch-action: none;
    pointer-events: auto;
}
.gc-assistant__resize--n {
    top: 0;
    left: 20px;
    right: 48px;
    height: 12px;
    cursor: ns-resize;
}
.gc-assistant__resize--w {
    top: 20px;
    left: 0;
    bottom: 12px;
    width: 12px;
    cursor: ew-resize;
}
.gc-assistant__resize--nw {
    top: 0;
    left: 0;
    width: 22px;
    height: 22px;
    cursor: nwse-resize;
}
.gc-assistant__resize--nw::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 6px;
    width: 10px;
    height: 10px;
    border-top: 2px solid var(--color-text-muted);
    border-left: 2px solid var(--color-text-muted);
    border-radius: 2px 0 0 0;
    opacity: 0.9;
}
.gc-assistant__panel.is-resizing {
    user-select: none;
}
.gc-assistant__panel.is-resizing .gc-assistant__resize--nw::after,
.gc-assistant__resize--nw:hover::after {
    border-color: var(--color-primary);
}
.gc-assistant__head {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px 14px 20px;
    background: var(--color-primary-soft);
    border-bottom: 1px solid var(--color-border);
}
.gc-assistant__head strong {
    display: block;
    color: var(--color-ink);
    font-size: var(--fs-sm);
}
.gc-assistant__head p {
    margin: 4px 0 0;
    color: var(--color-text-muted);
    font-size: var(--fs-xs);
}
.gc-assistant__close {
    position: relative;
    z-index: 4;
    flex-shrink: 0;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    padding: 4px 8px;
    margin: -4px -4px -4px 0;
}
.gc-assistant__messages {
    flex: 1;
    overflow-y: auto;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--color-bg-alt);
}
.gc-assistant__bubble {
    max-width: 92%;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: var(--fs-sm);
    line-height: var(--lh-snug);
    white-space: pre-wrap;
    word-break: break-word;
}
.gc-assistant__bubble--bot {
    align-self: flex-start;
    background: #fff;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}
.gc-assistant__bubble--user {
    align-self: flex-end;
    background: var(--color-primary);
    color: #fff;
}
.gc-assistant__bubble--pending {
    color: var(--color-text-muted);
    font-style: italic;
}
.gc-assistant__form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    padding: 12px;
    border-top: 1px solid var(--color-border);
    background: #fff;
}
.gc-assistant__form textarea {
    resize: vertical;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-btn);
    padding: 8px 10px;
    font: inherit;
    font-size: var(--fs-sm);
    color: var(--color-text);
    min-height: 44px;
    max-height: 180px;
}
.gc-assistant__form .btn {
    align-self: end;
}
.gc-assistant__hint {
    margin: 0;
    padding: 0 12px 10px;
    font-size: 11px;
    color: var(--color-text-soft);
    background: #fff;
}
.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
@media (max-width: 640px) {
    .gc-assistant {
        right: 16px;
        bottom: 76px;
    }
    .gc-assistant__fab-label {
        display: none;
    }
    .gc-assistant__fab {
        width: 48px;
        height: 48px;
        padding: 0;
        justify-content: center;
        border-radius: 50%;
    }
    .gc-assistant__fab::before {
        content: '?';
        font-size: 18px;
        font-weight: 700;
    }
    .gc-assistant__panel {
        width: calc(100vw - 32px);
        height: min(70vh, calc(100vh - 120px));
        min-width: 0;
    }
    .gc-assistant__resize {
        display: none;
    }
}

/* 焦点样式（可访问性） */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 尊重用户动效偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    /* Avoid fill-mode:both + 0.01ms leaving opacity:0 forever */
    [class*="__brand"],
    [class*="__title"],
    [class*="__lead"],
    [class*="__actions"],
    [class*="__hint"],
    .hero-content p.hero-subtitle {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
    .btn:hover {
        transform: none;
    }
    #back-to-top {
        transition: opacity 0.15s ease, visibility 0.15s ease;
    }
    #back-to-top.visible {
        transform: none;
    }
    #back-to-top:hover {
        transform: none;
    }
}