/* ==============================================
   wishhmy-web · 现代科技风样式
   ============================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
                 "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #e6edf3;
    background: #050816;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }

.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 主题变量 ---------- */
:root {
    --primary: #00d4ff;
    --primary-dark: #0096c7;
    --accent: #7c3aed;
    --accent-2: #f59e0b;
    --bg: #050816;
    --bg-2: #0a1228;
    --bg-3: #111c3a;
    --line: rgba(0, 212, 255, 0.15);
    --text: #e6edf3;
    --text-dim: #9aa7bd;
}

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(5, 8, 22, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(5, 8, 22, 0.85);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 48px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: 6px;
}

.nav-links a {
    padding: 8px 14px;
    font-size: 14px;
    color: var(--text-dim);
    border-radius: 8px;
    transition: all 0.25s;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: rgba(0, 212, 255, 0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
}

/* ---------- 首屏 ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 120px 0 80px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(0, 212, 255, 0.18), transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(124, 58, 237, 0.18), transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(245, 158, 11, 0.05), transparent 50%);
    z-index: -2;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    z-index: -1;
}

.hero-inner {
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid var(--line);
    border-radius: 100px;
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 28px;
    background: rgba(0, 212, 255, 0.05);
}

.hero-title {
    font-size: clamp(40px, 6vw, 76px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-title .line {
    display: block;
}

.hero-title .accent {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 22px;
    color: var(--text);
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-dim);
    margin-bottom: 36px;
    line-height: 1.9;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #050816;
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 212, 255, 0.5);
}

.btn-ghost {
    border: 1px solid var(--line);
    color: var(--text);
    background: rgba(255, 255, 255, 0.02);
}

.btn-ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(0, 212, 255, 0.05);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 720px;
    padding-top: 32px;
    border-top: 1px solid var(--line);
}

.stat-num {
    font-size: 36px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.stat-num span {
    font-size: 14px;
    color: var(--text-dim);
    margin-left: 4px;
    -webkit-text-fill-color: var(--text-dim);
}

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

.scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.scroll-hint span {
    display: block;
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-dim);
    border-radius: 12px;
    position: relative;
}

.scroll-hint span::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 4px;
    animation: scrollHint 2s infinite;
}

@keyframes scrollHint {
    0% { transform: translate(-50%, 0); opacity: 1; }
    100% { transform: translate(-50%, 14px); opacity: 0; }
}

/* ---------- 通用 section ---------- */
.section {
    padding: 100px 0;
    position: relative;
}

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

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    border: 1px solid var(--line);
    border-radius: 100px;
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 16px;
    background: rgba(0, 212, 255, 0.05);
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-dim);
}

/* ---------- 关于我们 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 56px;
    align-items: center;
}

.about-text p {
    margin-bottom: 16px;
    color: var(--text-dim);
    line-height: 1.9;
}

.about-text strong {
    color: var(--primary);
    font-weight: 600;
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.a-card {
    padding: 24px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05) 0%, rgba(124, 58, 237, 0.05) 100%);
    border: 1px solid var(--line);
    border-radius: 14px;
    transition: all 0.3s;
}

.a-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 212, 255, 0.15);
}

.a-card-icon {
    display: inline-flex;
    padding: 6px 12px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #050816;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: 1px;
}

.a-card h3 {
    font-size: 17px;
    margin-bottom: 8px;
    color: var(--text);
}

.a-card p {
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.7;
}

/* ---------- 检测系统 ---------- */
.system-overview {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 56px;
    align-items: center;
    margin-bottom: 80px;
}

.overview-text h3 {
    font-size: 26px;
    margin-bottom: 18px;
    color: var(--text);
}

.overview-text p {
    color: var(--text-dim);
    margin-bottom: 16px;
    line-height: 1.9;
}

.overview-text strong {
    color: var(--primary);
    font-weight: 600;
}

.overview-visual {
    padding: 20px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
    border: 1px solid var(--line);
    border-radius: 18px;
}

.visual-frame {
    background: #0a1228;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.visual-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--line);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.visual-title {
    margin-left: 12px;
    font-size: 12px;
    color: var(--text-dim);
}

.visual-screen {
    padding: 28px 24px;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(0, 212, 255, 0.04) 19px, rgba(0, 212, 255, 0.04) 20px),
        repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(0, 212, 255, 0.04) 19px, rgba(0, 212, 255, 0.04) 20px);
}

.corn-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.corn-item {
    position: relative;
    padding: 16px 12px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--line);
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s;
}

.corn-item:hover {
    transform: translateY(-3px);
}

.corn-item.grade-a { border-color: #10b981; box-shadow: 0 0 20px rgba(16, 185, 129, 0.2); }
.corn-item.grade-b { border-color: #f59e0b; box-shadow: 0 0 20px rgba(245, 158, 11, 0.2); }
.corn-item.grade-c { border-color: #94a3b8; box-shadow: 0 0 20px rgba(148, 163, 184, 0.2); }

.badge {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 3px 8px;
    font-size: 10px;
    font-weight: 700;
    border-radius: 4px;
    color: #050816;
}

.grade-a .badge { background: #10b981; }
.grade-b .badge { background: #f59e0b; }
.grade-c .badge { background: #94a3b8; }

.corn-icon {
    width: 30px;
    height: 56px;
    margin: 8px auto;
    background: linear-gradient(180deg, #facc15 0%, #eab308 100%);
    border-radius: 4px 4px 50% 50% / 4px 4px 30% 30%;
    position: relative;
}

.corn-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: #16a34a;
    border-radius: 50%;
}

.corn-data {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 11px;
    color: var(--text-dim);
}

.visual-stats {
    display: flex;
    justify-content: space-between;
    padding: 12px 16px;
    background: rgba(0, 212, 255, 0.05);
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-dim);
}

.visual-stats span:first-child { color: #10b981; }

.system-functions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.func-card {
    padding: 28px 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--line);
    border-radius: 14px;
    transition: all 0.3s;
    position: relative;
}

.func-card:hover {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.06) 0%, rgba(124, 58, 237, 0.06) 100%);
    border-color: var(--primary);
    transform: translateY(-4px);
}

.func-num {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    opacity: 0.85;
}

.func-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text);
}

.func-card p {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.7;
}

/* ---------- 检测设备 ---------- */
.equipment {
    background: linear-gradient(180deg, transparent 0%, rgba(10, 18, 40, 0.6) 100%);
}

.equipment-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.equipment-visual {
    text-align: center;
    padding: 40px;
    background:
        radial-gradient(ellipse at center, rgba(0, 212, 255, 0.1) 0%, transparent 60%);
    border-radius: 18px;
    border: 1px solid var(--line);
}

.machine {
    position: relative;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 28px;
}

.machine-head {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border: 1px solid var(--line);
    border-radius: 12px 12px 0 0;
    border-bottom: none;
}

.cam {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #00d4ff, #1e3a8a);
    border: 3px solid #1e293b;
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
    position: relative;
}

.cam::before {
    content: '';
    position: absolute;
    inset: 6px;
    border-radius: 50%;
    background: #050816;
    border: 2px solid #00d4ff;
}

.light {
    width: 18px;
    height: 60px;
    background: linear-gradient(180deg, #fffbeb 0%, #fde68a 50%, #f59e0b 100%);
    border-radius: 4px;
    box-shadow: 0 0 16px rgba(245, 158, 11, 0.6);
}

.machine-body {
    background: linear-gradient(180deg, #1e293b, #0f172a);
    border: 1px solid var(--line);
    border-top: 2px solid #334155;
    border-bottom: none;
    padding: 24px 20px;
    position: relative;
}

.belt {
    height: 16px;
    background: #0a1228;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    border: 1px solid #334155;
}

.belt-track {
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(90deg, #475569 0 8px, #334155 8px 16px);
    animation: beltMove 2s linear infinite;
}

@keyframes beltMove {
    0% { transform: translateX(0); }
    100% { transform: translateX(-16px); }
}

.machine-legs {
    display: flex;
    justify-content: space-between;
    padding: 12px 30px 0;
}

.machine-legs::before,
.machine-legs::after {
    content: '';
    width: 14px;
    height: 40px;
    background: linear-gradient(180deg, #475569, #1e293b);
    border-radius: 4px;
}

.machine-base {
    height: 16px;
    background: linear-gradient(180deg, #334155, #1e293b);
    border: 1px solid var(--line);
    border-top: 2px solid #475569;
    border-radius: 0 0 12px 12px;
}

.machine-label {
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-dim);
    letter-spacing: 2px;
    font-weight: 600;
}

.equipment-specs h3 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text);
}

.spec-list {
    list-style: none;
}

.spec-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px dashed var(--line);
    gap: 16px;
}

.spec-list li:last-child { border-bottom: none; }

.spec-label {
    font-size: 14px;
    color: var(--text-dim);
    flex-shrink: 0;
}

.spec-value {
    font-size: 14px;
    color: var(--text);
    font-weight: 600;
    text-align: right;
}

/* ---------- 核心特性 ---------- */
.features {
    background: linear-gradient(180deg, transparent 0%, rgba(124, 58, 237, 0.04) 50%, transparent 100%);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 40px 32px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.04) 0%, rgba(124, 58, 237, 0.04) 100%);
    border: 1px solid var(--line);
    border-radius: 18px;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s;
}

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

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: 0 24px 60px rgba(0, 212, 255, 0.15);
}

.feature-card.highlight {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
    border-color: rgba(0, 212, 255, 0.3);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    padding: 12px;
    color: var(--primary);
    background: rgba(0, 212, 255, 0.1);
    border-radius: 14px;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    font-size: 28px;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 800;
}

.feature-tagline {
    color: var(--primary);
    font-size: 14px;
    margin-bottom: 16px;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-dim);
    line-height: 1.8;
    font-size: 14px;
}

/* ---------- 业务范围 ---------- */
.business-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.biz-category {
    padding: 28px 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--line);
    border-radius: 14px;
    transition: all 0.3s;
}

.biz-category:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    background: rgba(0, 212, 255, 0.04);
}

.biz-category h3 {
    font-size: 17px;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line);
    position: relative;
}

.biz-category h3::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 32px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.biz-category ul {
    list-style: none;
}

.biz-category li {
    padding: 8px 0 8px 16px;
    font-size: 13px;
    color: var(--text-dim);
    position: relative;
    line-height: 1.6;
}

.biz-category li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.biz-highlight {
    padding: 40px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 18px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.biz-highlight::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 120%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.biz-highlight-text {
    position: relative;
    z-index: 2;
}

.biz-highlight h3 {
    font-size: 24px;
    margin-bottom: 14px;
    color: var(--text);
}

.biz-highlight p {
    color: var(--text-dim);
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ---------- 联系我们 ---------- */
.contact {
    background: linear-gradient(180deg, transparent 0%, rgba(10, 18, 40, 0.6) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.contact-card {
    padding: 36px 32px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.04) 0%, rgba(124, 58, 237, 0.04) 100%);
    border: 1px solid var(--line);
    border-radius: 16px;
    transition: all 0.3s;
    text-align: center;
}

.contact-card.wide {
    grid-column: span 2;
}

.contact-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 212, 255, 0.15);
}

.contact-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    padding: 14px;
    color: var(--primary);
    background: rgba(0, 212, 255, 0.1);
    border-radius: 14px;
}

.contact-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text);
}

.contact-main {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.contact-sub {
    font-size: 13px;
    color: var(--text-dim);
}

/* ---------- 页脚 ---------- */
.footer {
    padding: 60px 0 24px;
    background: #03050f;
    border-top: 1px solid var(--line);
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-dim);
    font-size: 13px;
    margin-top: 8px;
}

.footer-desc {
    font-size: 12px !important;
    color: var(--text-dim);
    margin-top: 12px !important;
}

.footer-col h4 {
    font-size: 15px;
    margin-bottom: 16px;
    color: var(--text);
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.footer-col a,
.footer-col p {
    display: block;
    color: var(--text-dim);
    font-size: 13px;
    margin-bottom: 8px;
    transition: color 0.25s;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--line);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-dim);
    font-size: 12px;
}

.beian-link {
    color: var(--text-dim);
    transition: color 0.25s;
}

.beian-link:hover {
    color: var(--primary);
}

/* ---------- 返回顶部 ---------- */
.back-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #050816;
    font-size: 20px;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s;
    z-index: 90;
}

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

.back-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 212, 255, 0.5);
}

/* ---------- 滚动入场动画 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
    .nav-links {
        position: fixed;
        top: 68px;
        right: 16px;
        flex-direction: column;
        background: rgba(5, 8, 22, 0.95);
        backdrop-filter: blur(20px);
        padding: 16px;
        border: 1px solid var(--line);
        border-radius: 12px;
        min-width: 200px;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s;
    }

    .nav-links.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-toggle {
        display: flex;
    }

    .about-grid,
    .system-overview,
    .equipment-showcase {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .system-functions,
    .feature-grid,
    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .contact-card.wide {
        grid-column: span 1;
    }

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .hero-title {
        font-size: 38px;
    }
}

@media (max-width: 600px) {
    .section { padding: 70px 0; }
    .section-head { margin-bottom: 40px; }

    .about-cards { grid-template-columns: 1fr; }
    .system-functions,
    .feature-grid,
    .business-grid {
        grid-template-columns: 1fr;
    }

    .footer-inner { grid-template-columns: 1fr; }

    .hero-actions { flex-direction: column; }
    .btn { width: 100%; }
}