/* ============================================================
   HUAYI Electric — Core Design System
   Style: Minimal · Modern · Industrial · Large-scale layout
   ============================================================ */

/* ===== Design Tokens ===== */
:root {
    /* Brand / Industrial palette */
    --color-ink:        #0B1B2B;   /* deep industrial navy */
    --color-ink-2:      #12263A;   /* secondary ink */
    --color-ink-3:      #1E3A52;   /* navy panel */
    --color-accent:     #2563EB;   /* electric blue */
    --color-accent-2:   #38BDF8;   /* sky blue */
    --color-accent-ink: #1D4ED8;   /* deep accent */

    /* Neutrals */
    --color-white:      #FFFFFF;
    --color-bg:         #FFFFFF;
    --color-bg-alt:     #F4F7FA;   /* light steel */
    --color-bg-dark:    #0B1B2B;   /* dark sections */
    --color-border:     #E3E9EF;
    --color-border-2:   #D2DBE4;
    --color-text:       #1F2A36;
    --color-text-soft:  #5B6B7B;
    --color-text-mute:  #8A97A5;

    /* Status */
    --color-success:    #16A34A;
    --color-warning:    #F59E0B;
    --color-danger:     #DC2626;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SFMono-Regular', ui-monospace, 'JetBrains Mono', Consolas, 'Liberation Mono', Menlo, monospace;

    /* Spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    --space-4xl: 8rem;

    /* Layout */
    --container-max: 1280px;
    --container-wide: 1480px;
    --header-top-h: 38px;
    --header-main-h: 72px;
    --header-h: calc(var(--header-top-h) + var(--header-main-h));
    --radius: 6px;
    --radius-lg: 14px;
    --radius-xl: 22px;

    /* Shadows (subtle, industrial) */
    --shadow-sm: 0 1px 2px rgba(11,27,43,0.06);
    --shadow-md: 0 6px 20px rgba(11,27,43,0.08);
    --shadow-lg: 0 18px 48px rgba(11,27,43,0.14);

    --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--color-accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-accent-ink); }

ul, ol { list-style: none; }

button { cursor: pointer; border: none; background: none; font-family: inherit; color: inherit; }

::selection { background: var(--color-accent); color: #fff; }

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.18;
    color: var(--color-ink);
    letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.75rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }
h5 { font-size: 1rem; }
p  { margin-bottom: var(--space-md); }

.font-mono { font-family: var(--font-mono); }

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}
.container-wide { max-width: var(--container-wide); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.8rem 1.6rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
    border: 1.5px solid transparent;
    line-height: 1;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-ink); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-accent { background: var(--color-accent-2); color: var(--color-ink); }
.btn-accent:hover { background: #7DD3FC; color: var(--color-ink); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--color-accent); border-color: var(--color-accent); }
.btn-outline:hover { background: var(--color-accent); color: #fff; }
.btn-outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-outline-light:hover { background: #fff; color: var(--color-ink); }
.btn-white { background: #fff; color: var(--color-accent-ink); }
.btn-white:hover { background: var(--color-bg-alt); transform: translateY(-2px); }
.btn-lg { padding: 1rem 2.2rem; font-size: 1.02rem; }
.btn-block { width: 100%; }

/* ===== Header ===== */
.header {
    position: fixed;
    inset: 0 0 auto 0;
    background: rgba(255,255,255,0.92);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-sm); }

.header-top {
    background: var(--color-ink);
    color: rgba(255,255,255,0.78);
    font-size: 0.8rem;
    min-height: var(--header-top-h);
    display: flex; align-items: center;
}
.header-top .container { display: flex; justify-content: space-between; align-items: center; padding-top: 0; padding-bottom: 0; }
.header-top a { color: rgba(255,255,255,0.78); }
.header-top a:hover { color: #fff; }
.header-top-info { display: flex; gap: var(--space-xl); align-items: center; }
.header-top-info span, .header-top-info a { display: inline-flex; align-items: center; gap: 0.35rem; }

.header-main {
    height: var(--header-main-h);
    display: flex; align-items: center; justify-content: space-between;
}

.logo { display: flex; align-items: center; gap: 0.65rem; font-size: 1.45rem; font-weight: 800; color: var(--color-ink); letter-spacing: -0.03em; flex-shrink: 0; }
.logo:hover { color: var(--color-ink); }
.logo-mark {
    width: 42px; height: 42px;
    background: var(--color-ink);
    color: #fff;
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; font-weight: 800; letter-spacing: -0.04em;
    position: relative; overflow: hidden;
}
.logo-mark::after {
    content: ''; position: absolute; right: -6px; bottom: -6px;
    width: 18px; height: 18px; background: var(--color-accent); border-radius: 4px;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.05; }
.logo-text strong { font-size: 1.35rem; letter-spacing: 0.02em; }
.logo-text small { font-size: 0.66rem; font-weight: 500; color: var(--color-text-mute); letter-spacing: 0.14em; text-transform: uppercase; }

/* Navigation */
.nav { display: flex; align-items: center; gap: var(--space-xl); margin-left: var(--space-2xl); }
.nav-list { display: flex; gap: var(--space-lg); align-items: center; }
.nav-item { position: relative; }
.nav-link {
    font-size: 0.95rem; font-weight: 600; color: var(--color-text);
    padding: 0.5rem 0; display: inline-flex; align-items: center; gap: 0.25rem; position: relative;
}
.nav-link::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--color-accent); transition: var(--transition); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link:hover, .nav-link.active { color: var(--color-accent-ink); }

/* Mega menu */
.mega-menu {
    position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(12px);
    width: 720px; background: #fff; box-shadow: var(--shadow-lg); border-radius: var(--radius-lg);
    border: 1px solid var(--color-border); padding: var(--space-lg);
    opacity: 0; visibility: hidden; transition: var(--transition); z-index: 100;
}
.nav-item:hover .mega-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.mega-menu-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-sm); }
.mega-menu-item { display: block; padding: var(--space-md); border-radius: var(--radius); transition: var(--transition); border: 1px solid transparent; }
.mega-menu-item:hover { background: var(--color-bg-alt); border-color: var(--color-border); }
.mega-menu-item h5 { color: var(--color-ink); margin-bottom: 0.25rem; font-size: 0.95rem; }
.mega-menu-item p { font-size: 0.8rem; color: var(--color-text-soft); margin: 0; }

/* Header actions */
.header-actions { display: flex; align-items: center; gap: var(--space-md); margin-left: auto; flex-shrink: 0; }
.search-toggle { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; color: var(--color-text); transition: var(--transition); }
.search-toggle:hover { background: var(--color-bg-alt); color: var(--color-accent); }
.search-bar { position: absolute; top: 100%; left: 0; right: 0; background: #fff; box-shadow: var(--shadow-md); padding: var(--space-lg) 0; transform: translateY(-100%); opacity: 0; visibility: hidden; transition: var(--transition); z-index: 99; border-bottom: 1px solid var(--color-border); }
.search-bar.active { transform: translateY(0); opacity: 1; visibility: visible; }
.search-bar .container { display: flex; gap: var(--space-sm); }
.search-bar input { flex: 1; padding: 0.8rem 1rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: 1rem; font-family: inherit; }
.search-bar input:focus { outline: none; border-color: var(--color-accent); }

.mobile-toggle { display: none; width: 42px; height: 42px; flex-direction: column; justify-content: center; align-items: center; gap: 5px; }
.mobile-toggle span { width: 24px; height: 2px; background: var(--color-ink); border-radius: 2px; transition: var(--transition); }
.mobile-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav panel */
.nav-mobile, .nav-mobile-overlay { display: none; }
.nav-mobile {
    position: fixed; top: 0; right: 0; bottom: 0; width: min(86vw, 380px);
    background: #fff; z-index: 1100; padding: var(--space-xl) var(--space-lg);
    transform: translateX(100%); transition: transform 0.32s ease; overflow-y: auto;
    box-shadow: var(--shadow-lg);
}
.nav-mobile.active { transform: translateX(0); }
.nav-mobile-overlay { position: fixed; inset: 0; background: rgba(11,27,43,0.5); z-index: 1050; }
.nav-mobile-overlay.active { display: block; }
.nav-mobile-close { position: absolute; top: 14px; right: 18px; font-size: 2rem; line-height: 1; color: var(--color-text-soft); }
.nav-mobile-list li { border-bottom: 1px solid var(--color-border); }
.nav-mobile-link { display: flex; justify-content: space-between; align-items: center; padding: 1rem 0.25rem; font-weight: 600; color: var(--color-ink); }
.nav-mobile-arrow { font-size: 0.7rem; color: var(--color-text-mute); transition: var(--transition); }
.nav-mobile-sub { display: none; padding: 0 0 0.75rem 0.75rem; }
.nav-mobile-sub.active { display: block; }
.nav-mobile-sub a { display: block; padding: 0.55rem 0.5rem; font-size: 0.9rem; color: var(--color-text-soft); }

/* ===== Hero ===== */
.hero {
    position: relative; min-height: 94vh; display: flex; align-items: center;
    background:
        linear-gradient(160deg, rgba(7,19,31,0.94) 0%, rgba(11,27,43,0.88) 45%, rgba(18,58,82,0.80) 100%),
        url('../images/banners/banner-home.png') center/cover no-repeat;
    color: #fff; overflow: hidden; padding-top: var(--header-h);
}
.hero::before {
    content: ''; position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 56px 56px; mask-image: radial-gradient(circle at 30% 40%, #000 0%, transparent 75%);
}
.hero-grid {
    position: relative; z-index: 2; display: grid; grid-template-columns: 1.15fr 0.85fr;
    gap: var(--space-2xl); align-items: center; padding: var(--space-4xl) 0;
}
.hero-badge { display: inline-flex; align-items: center; gap: 0.5rem; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.18); padding: 0.45rem 1rem; border-radius: 50px; font-size: 0.82rem; font-weight: 600; margin-bottom: var(--space-lg); color: #fff; }
.hero-badge .dot { width: 8px; height: 8px; background: var(--color-accent-2); border-radius: 50%; box-shadow: 0 0 0 4px rgba(56,189,248,0.25); }
.hero h1 { color: #fff; font-size: clamp(2.6rem, 5vw, 4.2rem); line-height: 1.08; margin-bottom: var(--space-lg); letter-spacing: -0.03em; }
.hero h1 span { color: var(--color-accent-2); }
.hero p.lead { font-size: 1.18rem; color: rgba(255,255,255,0.82); max-width: 560px; margin-bottom: var(--space-xl); }
.hero-actions { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); margin-top: var(--space-2xl); padding-top: var(--space-xl); border-top: 1px solid rgba(255,255,255,0.14); }
.hero-stat-num { font-size: 2.1rem; font-weight: 800; color: #fff; line-height: 1; }
.hero-stat-num span { color: var(--color-accent-2); }
.hero-stat-label { font-size: 0.82rem; color: rgba(255,255,255,0.66); margin-top: 0.4rem; }

/* Hero visual panel (industrial schematic) */
.hero-visual { position: relative; }
.hero-panel {
    background: linear-gradient(160deg, rgba(37,99,235,0.18), rgba(255,255,255,0.04));
    border: 1px solid rgba(255,255,255,0.16); border-radius: var(--radius-xl);
    padding: var(--space-xl); backdrop-filter: blur(4px);
}
.hero-panel-row { display: flex; align-items: center; justify-content: space-between; padding: 0.85rem 0; border-bottom: 1px dashed rgba(255,255,255,0.14); }
.hero-panel-row:last-child { border-bottom: none; }
.hero-panel-row .k { color: rgba(255,255,255,0.7); font-size: 0.88rem; }
.hero-panel-row .v { font-family: var(--font-mono); color: #fff; font-size: 0.9rem; }
.hero-panel-row .v.ok { color: var(--color-accent-2); }

/* ===== Section ===== */
.section { padding: var(--space-4xl) 0; }
.section-sm { padding: var(--space-3xl) 0; }
.section-alt { background: var(--color-bg-alt); }
.section-dark { background: var(--color-bg-dark); color: #fff; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .section-subtitle { color: rgba(255,255,255,0.7); }

.section-header { text-align: center; max-width: 680px; margin: 0 auto var(--space-3xl); }
.section-header.left { text-align: left; margin-left: 0; }
.section-tag { display: inline-block; color: var(--color-accent); font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.18em; margin-bottom: var(--space-sm); }
.section-tag::before { content: ''; display: inline-block; width: 22px; height: 2px; background: var(--color-accent); vertical-align: middle; margin-right: 0.6rem; }
.section-title { margin-bottom: var(--space-md); letter-spacing: -0.02em; }
.section-subtitle { color: var(--color-text-soft); font-size: 1.05rem; }

/* ===== Category cards ===== */
.category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-lg); }
.category-card {
    background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    padding: var(--space-xl); transition: var(--transition); position: relative; overflow: hidden;
}
.category-card::before { content: ''; position: absolute; left: 0; top: 0; height: 3px; width: 0; background: var(--color-accent); transition: var(--transition); }
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-border-2); }
.category-card:hover::before { width: 100%; }
.category-card-icon { width: 64px; height: 64px; margin-bottom: var(--space-md); background: var(--color-bg-alt); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--color-accent); transition: var(--transition); }
.category-card:hover .category-card-icon { background: var(--color-accent); color: #fff; }
.category-card-icon svg { width: 32px; height: 32px; }
.category-card h3 { font-size: 1.15rem; margin-bottom: 0.4rem; }
.category-card p { font-size: 0.9rem; color: var(--color-text-soft); margin-bottom: var(--space-md); }
.category-card-count { display: inline-block; background: var(--color-bg-alt); color: var(--color-accent-ink); padding: 0.25rem 0.8rem; border-radius: 50px; font-size: 0.75rem; font-weight: 600; }

/* ===== Product cards ===== */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: var(--space-lg); }
.product-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); display: flex; flex-direction: column; }
.product-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-accent); }
.product-card-img { height: 210px; background: linear-gradient(160deg, #EEF3F8, #DDE7F0); display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
.product-card-img svg.ph { width: 84px; height: 84px; color: var(--color-accent); opacity: 0.45; }
.product-card-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.product-card-img .cat-tag { position: absolute; top: 12px; left: 12px; background: rgba(11,27,43,0.82); color: #fff; font-size: 0.7rem; font-weight: 600; padding: 0.25rem 0.7rem; border-radius: 50px; letter-spacing: 0.04em; }
.product-card-body { padding: var(--space-lg); display: flex; flex-direction: column; flex: 1; }
.product-card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; color: var(--color-ink); line-height: 1.35; }
.product-card-desc { font-size: 0.86rem; color: var(--color-text-soft); margin-bottom: var(--space-md); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex: 1; }
.product-card-footer { display: flex; justify-content: space-between; align-items: center; padding-top: var(--space-md); border-top: 1px solid var(--color-border); }
.product-card-model { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-text-mute); }
.product-card-link { color: var(--color-accent); font-weight: 600; font-size: 0.85rem; display: inline-flex; align-items: center; gap: 0.3rem; }
.product-card-link:hover { gap: 0.55rem; color: var(--color-accent-ink); }

/* ===== Feature blocks (why choose us) ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--space-lg); }
.feature-block { padding: var(--space-xl) var(--space-md); border-top: 2px solid var(--color-border); transition: var(--transition); }
.feature-block:hover { border-top-color: var(--color-accent); }
.feature-block-icon { width: 56px; height: 56px; margin-bottom: var(--space-md); background: var(--color-bg-alt); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--color-accent); }
.feature-block-icon svg { width: 28px; height: 28px; }
.feature-block h4 { margin-bottom: 0.4rem; }
.feature-block p { font-size: 0.9rem; color: var(--color-text-soft); margin: 0; }

/* ===== About preview ===== */
.about-preview { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); align-items: center; }
.about-visual { position: relative; border-radius: var(--radius-xl); overflow: hidden; aspect-ratio: 4/3; background: linear-gradient(160deg, var(--color-ink), var(--color-accent-ink)); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.9); }
.about-visual::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.08) 1px, transparent 1px); background-size: 40px 40px; }
.about-visual .big-mark { font-size: 5rem; font-weight: 800; letter-spacing: -0.04em; position: relative; z-index: 2; }
.about-preview-content h2 { margin-bottom: var(--space-md); }
.about-preview-content > p { color: var(--color-text-soft); }
.about-list { margin: var(--space-lg) 0; }
.about-list li { display: flex; align-items: flex-start; gap: 0.6rem; margin-bottom: 0.65rem; color: var(--color-text); }
.about-list li svg { width: 20px; height: 20px; color: var(--color-accent); flex-shrink: 0; margin-top: 3px; }

/* Stat band */
.stat-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-xl); }
.stat-item { text-align: center; }
.stat-num { font-size: clamp(2.4rem, 4vw, 3.4rem); font-weight: 800; color: var(--color-accent); line-height: 1; letter-spacing: -0.03em; }
.stat-label { font-size: 0.9rem; color: var(--color-text-soft); margin-top: 0.5rem; }

/* ===== Certifications ===== */
.cert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--space-md); }
.cert-badge { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-lg) var(--space-md); text-align: center; transition: var(--transition); }
.cert-badge:hover { border-color: var(--color-accent); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.cert-badge-name { font-weight: 800; color: var(--color-ink); font-size: 1.15rem; letter-spacing: 0.02em; }
.cert-badge-desc { font-size: 0.78rem; color: var(--color-text-soft); margin-top: 0.25rem; }

/* ===== Logo wall (partners) ===== */
.logo-wall { display: flex; flex-wrap: wrap; gap: var(--space-xl); align-items: center; justify-content: center; }
.logo-wall .partner { font-weight: 700; color: var(--color-text-mute); font-size: 1.1rem; letter-spacing: 0.02em; opacity: 0.8; transition: var(--transition); }
.logo-wall .partner:hover { color: var(--color-ink); opacity: 1; }

/* ===== CTA ===== */
.cta-section { background: linear-gradient(150deg, var(--color-accent-ink), var(--color-ink)); color: #fff; text-align: center; padding: var(--space-3xl) 0; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px); background-size: 48px 48px; }
.cta-section > .container { position: relative; z-index: 2; }
.cta-section h2 { color: #fff; margin-bottom: var(--space-md); }
.cta-section p { color: rgba(255,255,255,0.82); font-size: 1.1rem; max-width: 600px; margin: 0 auto var(--space-xl); }
.cta-actions { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* ===== Breadcrumb / Page header ===== */
.breadcrumb { background: var(--color-bg-alt); padding: 0.85rem 0; margin-top: var(--header-h); border-bottom: 1px solid var(--color-border); }
.breadcrumb-list { display: flex; gap: 0.5rem; align-items: center; font-size: 0.85rem; flex-wrap: wrap; }
.breadcrumb-list a { color: var(--color-text-soft); }
.breadcrumb-list a:hover { color: var(--color-accent); }
.breadcrumb-list .separator { color: var(--color-text-mute); }
.breadcrumb-list .current { color: var(--color-accent-ink); font-weight: 600; }

/* breadcrumb placed ON the banner image */
.page-header .breadcrumb {
    background: transparent; border: none; padding: 0; margin: 0 0 var(--space-md);
    position: relative; z-index: 3;
}
.page-header .breadcrumb-list { justify-content: center; gap: 0.5rem; }
.page-header .breadcrumb-list a,
.page-header .breadcrumb-list .separator { color: rgba(255,255,255,0.72); }
.page-header .breadcrumb-list a:hover { color: #fff; }
.page-header .breadcrumb-list .current { color: #fff; }

.page-header {
    background: linear-gradient(150deg, var(--color-ink), var(--color-ink-3));
    color: #fff; padding: var(--space-3xl) 0; text-align: center;
    position: relative; overflow: hidden;
    background-size: cover; background-position: center;
    /* Height follows each banner's real image ratio (set per class below) so the
       full image is shown without cropping. Content can still grow it if taller. */
    display: flex; align-items: center;
}
.page-header::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px); background-size: 52px 52px; z-index: 1; }
.page-header::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(150deg, rgba(11,27,43,0.82) 0%, rgba(18,38,58,0.78) 60%, rgba(30,58,82,0.72) 100%);
    z-index: 1;
}
/* Text overlay sits ABSOLUTELY inside the banner so it can never push the
   box taller than its aspect-ratio (which would make background-size:cover
   crop the image). Vertical centering via flex. */
.page-header > .container { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: center; z-index: 2; }
.page-header h1 { color: #fff; margin-bottom: var(--space-sm); }
.page-header p { color: rgba(255,255,255,0.85); max-width: 640px; margin: 0 auto; font-size: 1.08rem; }

/* Per-page banner images — aspect-ratio set to each PNG's real dimensions so
   background-size:cover shows the FULL image (no vertical/horizontal cropping). */
.page-header-home      { background-image: url('../images/banners/banner-home.png');     aspect-ratio: 1983 / 793; }
.page-header-about     { background-image: url('../images/banners/banner-about.png');    aspect-ratio: 1942 / 809; }
.page-header-products  { background-image: url('../images/banners/banner-products.png');  aspect-ratio: 2172 / 724; }
.page-header-solutions { background-image: url('../images/banners/banner-solutions.png'); aspect-ratio: 2160 / 728; }
.page-header-news      { background-image: url('../images/banners/banner-news.png');      aspect-ratio: 1942 / 809; }
.page-header-contact   { background-image: url('../images/banners/banner-contact.png');   aspect-ratio: 2172 / 724; }
.page-header-legal     { background-image: url('../images/banners/banner-legal.png');     aspect-ratio: 1735 / 906; }
.page-header-error     { background-image: url('../images/banners/banner-help.png');      aspect-ratio: 1942 / 809; }

/* ===== Product filter ===== */
.product-filter { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-2xl); justify-content: center; }
.filter-btn { padding: 0.5rem 1.2rem; border: 1.5px solid var(--color-border-2); border-radius: 50px; font-size: 0.85rem; font-weight: 600; color: var(--color-text); background: #fff; transition: var(--transition); }
.filter-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.filter-btn.active { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }

/* ===== Product detail ===== */
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); margin-bottom: var(--space-2xl); }
.product-gallery { position: sticky; top: calc(var(--header-h) + var(--space-md)); }
.product-main-img { width: 100%; aspect-ratio: 1; background: linear-gradient(160deg, #EEF3F8, #DDE7F0); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; border: 1px solid var(--color-border); margin-bottom: var(--space-md); }
.product-main-img svg.ph { width: 140px; height: 140px; color: var(--color-accent); opacity: 0.4; }
.product-main-img img { width: 100%; height: 100%; object-fit: contain; display: block; border-radius: var(--radius-lg); }
.product-thumbs { display: flex; gap: var(--space-sm); }
.product-thumb { width: 84px; height: 84px; background: var(--color-bg-alt); border-radius: var(--radius); border: 2px solid var(--color-border); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition); color: var(--color-accent); opacity: 0.6; overflow: hidden; }
.product-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.product-thumb:hover, .product-thumb.active { border-color: var(--color-accent); opacity: 1; }
.product-info h1 { font-size: clamp(1.8rem, 3vw, 2.4rem); margin-bottom: var(--space-sm); }
.product-info .product-model { font-family: var(--font-mono); color: var(--color-text-mute); margin-bottom: var(--space-sm); }
.product-info .product-short-desc { color: var(--color-text-soft); line-height: 1.75; margin-bottom: var(--space-lg); font-size: 0.98rem; }
.product-info .product-short-desc:empty { display: none; }
.product-tag { display: inline-block; background: rgba(37,99,235,0.1); color: var(--color-accent-ink); padding: 0.3rem 0.85rem; border-radius: 50px; font-size: 0.8rem; font-weight: 600; margin-bottom: var(--space-md); }
.product-info .product-description { color: var(--color-text-soft); line-height: 1.8; margin-bottom: var(--space-lg); }
/* 后台富文本「详细描述」在前台渲染（Applications 下方） */
.rich-content { color: var(--color-text); line-height: 1.8; font-size: 0.96rem; margin-top: var(--space-md); }
.rich-content:empty { display: none; }
.rich-content h2 { font-size: 1.35rem; font-weight: 700; margin: 1.1em 0 0.5em; color: var(--color-heading); }
.rich-content h3 { font-size: 1.15rem; font-weight: 700; margin: 1em 0 0.5em; color: var(--color-heading); }
.rich-content p { margin: 0.7em 0; }
.rich-content ul, .rich-content ol { margin: 0.7em 0; padding-left: 1.5em; }
.rich-content li { margin: 0.35em 0; }
.rich-content a { color: var(--color-accent); text-decoration: underline; }
.rich-content strong, .rich-content b { font-weight: 700; color: var(--color-heading); }
.rich-content blockquote { margin: 0.9em 0; padding: 0.6em 1em; border-left: 4px solid var(--color-accent); background: rgba(37,99,235,0.06); border-radius: 0 8px 8px 0; color: var(--color-text-soft); }
.rich-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 0.6em 0; }
.rich-content table { width: 100%; border-collapse: collapse; margin: 0.8em 0; }
.rich-content th, .rich-content td { border: 1px solid var(--color-border); padding: 0.5em 0.7em; text-align: left; }
.rich-content code { font-family: var(--font-mono); background: rgba(15,23,42,0.06); padding: 0.1em 0.4em; border-radius: 4px; font-size: 0.9em; }
.product-features { margin-bottom: var(--space-lg); }
.product-features li { display: flex; align-items: flex-start; gap: 0.55rem; margin-bottom: 0.5rem; font-size: 0.95rem; }
.product-features li svg { width: 20px; height: 20px; color: var(--color-success); flex-shrink: 0; margin-top: 3px; }
.product-actions { display: flex; gap: var(--space-md); margin-top: var(--space-lg); padding-top: var(--space-lg); border-top: 1px solid var(--color-border); flex-wrap: wrap; }

/* Spec table */
.spec-table { width: 100%; border-collapse: collapse; margin-bottom: var(--space-xl); }
.spec-table th, .spec-table td { padding: 0.85rem 1rem; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 0.92rem; vertical-align: top; }
.spec-table th { background: var(--color-bg-alt); font-weight: 600; color: var(--color-ink); width: 38%; }
.spec-table td { color: var(--color-text); }

/* Tabs */
.product-tabs { margin-top: var(--space-2xl); }
.tab-headers { display: flex; gap: var(--space-xl); border-bottom: 2px solid var(--color-border); margin-bottom: var(--space-xl); }
.tab-header { padding: 0.85rem 0.25rem; font-weight: 600; color: var(--color-text-soft); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -2px; transition: var(--transition); }
.tab-header:hover { color: var(--color-ink); }
.tab-header.active { color: var(--color-accent-ink); border-bottom-color: var(--color-accent); }
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ===== Solutions ===== */
.solution-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: var(--space-lg); }
.solution-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); }
.solution-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.solution-card-img { height: 180px; background: linear-gradient(160deg, var(--color-ink), var(--color-accent-ink)); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.4); }
.solution-card-img svg { width: 60px; height: 60px; }
.solution-card-body { padding: var(--space-lg); }
.solution-card h3 { font-size: 1.2rem; margin-bottom: 0.4rem; }
.solution-card p { font-size: 0.9rem; color: var(--color-text-soft); margin-bottom: var(--space-md); }
.solution-list li { font-size: 0.86rem; color: var(--color-text); margin-bottom: 0.35rem; padding-left: 1.2rem; position: relative; }
.solution-list li::before { content: '→'; position: absolute; left: 0; color: var(--color-accent); font-weight: 700; }

/* ===== News ===== */
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: var(--space-lg); }
.news-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); display: flex; flex-direction: column; }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-card-img { height: 190px; background: linear-gradient(160deg, var(--color-ink), var(--color-accent-ink)); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.35); }
.news-card-img svg { width: 50px; height: 50px; }
.news-card-body { padding: var(--space-lg); display: flex; flex-direction: column; flex: 1; }
.news-card-date { font-size: 0.8rem; color: var(--color-text-mute); display: flex; align-items: center; gap: 0.35rem; margin-bottom: 0.45rem; }
.news-card h3 { font-size: 1.1rem; line-height: 1.4; margin-bottom: 0.5rem; }
.news-card p { font-size: 0.9rem; color: var(--color-text-soft); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; flex: 1; }
.news-card .read-more { margin-top: var(--space-md); font-weight: 600; color: var(--color-accent); font-size: 0.88rem; display: inline-flex; align-items: center; gap: 0.3rem; }

/* Article body (news detail) */
.article { max-width: 760px; margin: 0 auto; }
.article h2 { font-size: 1.6rem; margin: var(--space-xl) 0 var(--space-md); }
.article h3 { font-size: 1.25rem; margin: var(--space-lg) 0 var(--space-sm); }
.article p { color: var(--color-text); line-height: 1.85; margin-bottom: var(--space-md); }
.article ul { margin: 0 0 var(--space-md) 1.2rem; }
.article ul li { list-style: disc; margin-bottom: 0.4rem; color: var(--color-text); }
.article-lead { font-size: 1.15rem; color: var(--color-text-soft) !important; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: var(--space-2xl); align-items: start; }
.contact-info-card { background: var(--color-ink); color: #fff; border-radius: var(--radius-lg); padding: var(--space-xl); }
.contact-info-card h3 { color: #fff; margin-bottom: var(--space-lg); }
.contact-info-item { display: flex; gap: var(--space-md); margin-bottom: var(--space-lg); }
.contact-info-item-icon { width: 44px; height: 44px; background: rgba(255,255,255,0.08); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; color: var(--color-accent-2); flex-shrink: 0; }
.contact-info-item-icon svg { width: 22px; height: 22px; }
.contact-info-item-text h5 { color: rgba(255,255,255,0.6); font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.2rem; }
.contact-info-item-text p, .contact-info-item-text a { color: #fff; margin: 0; font-size: 0.95rem; }
.contact-info-item-text a:hover { color: var(--color-accent-2); }

.contact-form { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-xl); box-shadow: var(--shadow-sm); }
.form-group { margin-bottom: var(--space-md); }
.form-group label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 0.4rem; color: var(--color-ink); }
.form-group label .req { color: var(--color-danger); }
.form-control { width: 100%; padding: 0.8rem 1rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: 0.95rem; font-family: inherit; transition: var(--transition); background: #fff; color: var(--color-text); }
.form-control:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(37,99,235,0.12); }
textarea.form-control { resize: vertical; min-height: 130px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.form-note { font-size: 0.82rem; color: var(--color-text-mute); margin-top: 0.5rem; }
.form-success { display: none; background: rgba(22,163,74,0.1); border: 1px solid rgba(22,163,74,0.3); color: #15803D; padding: 0.9rem 1rem; border-radius: var(--radius); font-size: 0.9rem; margin-bottom: var(--space-md); }
.form-success.show { display: block; }

/* Map placeholder */
.map-placeholder { height: 280px; border-radius: var(--radius-lg); background: linear-gradient(160deg, #EEF3F8, #DDE7F0); border: 1px solid var(--color-border); display: flex; align-items: center; justify-content: center; color: var(--color-text-soft); margin-top: var(--space-lg); }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: var(--space-md); overflow: hidden; background: #fff; transition: var(--transition); }
.faq-item.active { border-color: var(--color-accent); box-shadow: var(--shadow-sm); }
.faq-question { display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); padding: 1.1rem 1.25rem; cursor: pointer; font-weight: 600; color: var(--color-ink); }
.faq-question .faq-icon { color: var(--color-accent); font-size: 1.3rem; transition: var(--transition); flex-shrink: 0; }
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-answer-inner { padding: 0 1.25rem 1.1rem; color: var(--color-text-soft); font-size: 0.92rem; }

/* ===== 404 ===== */
.error-wrap { text-align: center; padding: var(--space-4xl) 0; }
.error-code { font-size: clamp(5rem, 14vw, 10rem); font-weight: 800; color: var(--color-accent); line-height: 1; letter-spacing: -0.04em; }

/* ===== Footer ===== */
.footer { background: var(--color-bg-dark); color: rgba(255,255,255,0.68); padding: var(--space-3xl) 0 var(--space-lg); }
.footer-grid { display: grid; grid-template-columns: 2.2fr 1fr 1fr 1fr 1.3fr; gap: var(--space-xl); margin-bottom: var(--space-2xl); }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: var(--space-md); text-transform: uppercase; letter-spacing: 0.08em; }
.footer-col p { font-size: 0.9rem; line-height: 1.7; }
.footer-col ul li { margin-bottom: 0.55rem; }
.footer-col ul li a { color: rgba(255,255,255,0.68); font-size: 0.9rem; }
.footer-col ul li a:hover { color: var(--color-accent-2); padding-left: 4px; }
.footer-logo { display: flex; align-items: center; gap: 0.6rem; margin-bottom: var(--space-md); color: #fff; font-size: 1.3rem; font-weight: 800; }
.footer-social { display: flex; gap: var(--space-sm); margin-top: var(--space-md); }
.footer-social a { width: 36px; height: 36px; background: rgba(255,255,255,0.08); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; transition: var(--transition); }
.footer-social a:hover { background: var(--color-accent); transform: translateY(-2px); }
.footer-social svg { width: 18px; height: 18px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--space-lg); display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); font-size: 0.84rem; flex-wrap: wrap; }
.footer-bottom-links { display: flex; gap: var(--space-lg); }
.footer-bottom-links a { color: rgba(255,255,255,0.6); }
.footer-bottom-links a:hover { color: #fff; }

/* ===== Float buttons ===== */
.scroll-top { position: fixed; bottom: 16rem; right: 22px; width: 46px; height: 46px; background: var(--color-accent); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; opacity: 0; visibility: hidden; transition: var(--transition); z-index: 999; box-shadow: var(--shadow-md); }
.scroll-top.visible { opacity: 1; visibility: visible; }
.scroll-top:hover { background: var(--color-accent-ink); transform: translateY(-4px); }

/* Floating quick contact buttons (bottom-right) */
.floating-contact {
  position: fixed;
  right: 22px;
  bottom: 24px;
  z-index: 1000;
  display: grid;
  justify-items: end;
  gap: 10px;
}

.floating-contact-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: 46px;
  min-height: 46px;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(11, 27, 43, 0.92);
  color: #fff;
  box-shadow: 0 14px 36px rgba(11, 27, 43, 0.22);
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: width 0.2s ease, transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.floating-contact-btn:hover,
.floating-contact-btn:focus-visible {
  width: 142px;
  transform: translateY(-2px);
  background: var(--color-ink);
  border-color: rgba(255, 255, 255, 0.32);
}

.floating-contact-whatsapp:hover,
.floating-contact-whatsapp:focus-visible {
  background: #128C7E;
}

.floating-contact-label {
  position: absolute;
  right: 44px;
  opacity: 0;
  transform: translateX(8px);
  white-space: nowrap;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  pointer-events: none;
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.floating-contact-btn:hover .floating-contact-label,
.floating-contact-btn:focus-visible .floating-contact-label {
  opacity: 1;
  transform: translateX(0);
}

.floating-contact-icon {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  color: var(--color-ink);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0;
}

.floating-contact-chat .floating-contact-icon {
  background: #2563EB;
  color: #fff;
}

.floating-contact-chat-icon::before {
  content: "";
  width: 14px;
  height: 11px;
  display: block;
  border-radius: 50% 50% 46% 46%;
  background: currentColor;
}

.floating-contact-chat-icon::after {
  content: "";
  position: absolute;
  right: 8px;
  bottom: 7px;
  width: 6px;
  height: 6px;
  background: currentColor;
  clip-path: polygon(0 0, 100% 35%, 28% 100%);
}

.floating-contact-whatsapp .floating-contact-icon {
  background: #25D366;
  color: #0b2414;
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-0 { margin-top: 0 !important; } .mb-0 { margin-bottom: 0 !important; }
.mt-lg { margin-top: var(--space-lg); } .mt-xl { margin-top: var(--space-xl); }
.mb-lg { margin-bottom: var(--space-lg); } .mb-xl { margin-bottom: var(--space-xl); }
.hidden { display: none !important; }
.no-results { grid-column: 1/-1; text-align: center; padding: var(--space-3xl) 0; color: var(--color-text-soft); }
.no-results svg { width: 56px; height: 56px; color: var(--color-text-mute); margin-bottom: var(--space-md); }