/*
 * 文件: css/style.css
 * 项目: 沙河市皓晶玻璃有限公司企业官网
 * 说明: 构建设计方案中的“晶莹剔透 · 光影艺术”视觉体系，包含玻璃质感组件、光影动效、
 *       数据化展示与模块化布局，适配所有子页面。
 */

/* =============================
   1. CSS Design Tokens
   ============================= */
:root {
    --color-deep-blue: #021c3d;
    --color-crystal-blue: #1c5fa6;
    --color-ice-blue: #7fd4ff;
    --color-silver: #cdd7e1;
    --color-gold: #ffd26a;
    --color-bg: #f4f8ff;
    --color-card: rgba(255, 255, 255, 0.85);
    --color-border: rgba(255, 255, 255, 0.3);
    --color-text: #1a2740;
    --color-muted: #5f6b85;

    --gradient-hero: radial-gradient(circle at top, rgba(127, 212, 255, 0.35), rgba(2, 28, 61, 0.95));
    --gradient-panel: linear-gradient(135deg, rgba(255,255,255,0.25), rgba(255,255,255,0.05));

    --shadow-soft: 0 10px 40px rgba(6, 32, 73, 0.18);
    --shadow-card: 0 12px 32px rgba(8, 24, 63, 0.16);

    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 28px;

    --max-width: 1200px;
    --nav-height: 86px;
}

/* =============================
   2. Reset & Base
   ============================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Inter", "Microsoft YaHei", "PingFang SC", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-sm);
}

a {
    color: var(--color-crystal-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-ice-blue);
}

main {
    padding-top: var(--nav-height);
}

section {
    padding: 80px 0;
}

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

.section-title {
    text-align: center;
    font-size: 2.2rem;
    letter-spacing: 0.08em;
    color: var(--color-deep-blue);
}

.section-subtitle {
    text-align: center;
    color: var(--color-muted);
    margin-top: 12px;
    margin-bottom: 48px;
}

/* =============================
   3. Header & Navigation
   ============================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    backdrop-filter: blur(18px);
    background: rgba(2, 28, 61, 0.78);
    box-shadow: var(--shadow-soft);
    z-index: 999;
}

.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto 0 0;
    padding: 0 24px 0 12px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 24px;
    color: #fff;
    flex-wrap: nowrap;
}

.nav-container nav {
    flex: 1;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 18px;
    flex-wrap: nowrap;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: #fff;
    font-size: 0.95rem;
    padding: 12px 10px;
    display: block;
    white-space: nowrap;
}

.nav-link::after {
    content: "";
    display: block;
    height: 2px;
    margin-top: 6px;
    background: linear-gradient(90deg, transparent, var(--color-ice-blue), transparent);
    opacity: 0;
    transform: scaleX(0.4);
    transition: all 0.3s ease;
}

.nav-link:hover::after,
.nav-item.active .nav-link::after {
    opacity: 1;
    transform: scaleX(1);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 18px);
    left: 0;
    min-width: 200px;
    background: rgba(8, 24, 63, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: 16px 0;
    display: none;
    box-shadow: var(--shadow-card);
}

.nav-item:hover .dropdown-menu {
    display: block;
}

.dropdown-item a {
    color: #fff;
    display: block;
    padding: 10px 18px;
    font-size: 0.92rem;
}

.dropdown-item a:hover {
    background: rgba(127, 212, 255, 0.08);
}

.nav-actions {
    display: flex;
    gap: 12px;
    flex-wrap: nowrap;
    flex-shrink: 0;
    margin-left: auto;
}

/* =============================
   4. Buttons & Chips
   ============================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 26px;
    border-radius: 999px;
    font-weight: 600;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.btn.primary {
    background: linear-gradient(120deg, #1a7dff, #46d6ff);
    color: #fff;
    box-shadow: 0 15px 30px rgba(28, 95, 166, 0.25);
}

.btn.primary:hover {
    transform: translateY(-3px);
}

.btn.outline {
    border-color: rgba(255, 255, 255, 0.6);
    color: #fff;
    background: transparent;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.3);
    color: var(--color-deep-blue);
    font-size: 0.85rem;
    margin: 4px;
}

/* =============================
   5. Utility Layouts
   ============================= */
.grid {
    display: grid;
    gap: 24px;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.grid-md-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-md-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-md-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.grid-lg-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-lg-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }

.bg-light {
    background: rgba(244, 248, 255, 0.92);
}

.text-center {
    text-align: center;
}

.content-wrapper {
    padding-top: var(--nav-height);
}

.section-padding {
    padding: 80px 0;
}

.grid-col-1 { grid-template-columns: repeat(1, 1fr); }
.grid-col-2 { grid-template-columns: repeat(2, 1fr); }
.grid-col-3 { grid-template-columns: repeat(3, 1fr); }
.grid-col-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: rgba(255,255,255,0.92);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(255,255,255,0.35);
}

.card:hover {
    box-shadow: var(--shadow-card);
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
    gap: 18px;
}

.stat {
    background: var(--gradient-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    backdrop-filter: blur(14px);
}

.stat strong {
    font-size: 2.4rem;
    display: block;
    color: #fff;
}

.stat span {
    color: var(--color-ice-blue);
    font-size: 0.95rem;
}

.metric-card {
    padding: 28px;
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.35);
    backdrop-filter: blur(16px);
    color: #fff;
    min-width: 220px;
}

.metric-card strong {
    font-size: 2.6rem;
    display: block;
    margin-bottom: 6px;
}

.metric-card span {
    font-size: 0.9rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.8);
}

.metrics-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

/* =============================
   6. Glass & Card Components
   ============================= */
.glass-panel {
    background: var(--gradient-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(18px);
}

.glass-card {
    padding: 24px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: var(--shadow-soft);
}

.glass-section {
    position: relative;
    background: linear-gradient(140deg, rgba(2,28,61,0.85), rgba(28,95,166,0.55));
    color: #fff;
    overflow: hidden;
}

.glass-section::before,
.glass-section::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(127,212,255,0.18), rgba(127,212,255,0));
}

.glass-section::before {
    width: 420px;
    height: 420px;
    top: -180px;
    right: -120px;
}

.glass-section::after {
    width: 320px;
    height: 320px;
    bottom: -140px;
    left: -120px;
}

.glass-section .container {
    position: relative;
    z-index: 2;
}

.glass-section h2 {
    color: #fff;
}

.glow-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-ice-blue), transparent);
    margin: 16px auto;
}

/* =============================
   7. Hero & Background FX
   ============================= */
.hero {
    position: relative;
    background: var(--gradient-hero);
    color: #fff;
    padding: 140px 0 110px;
    overflow: hidden;
}

.hero::before,
.hero::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(127,212,255,0.45), rgba(127,212,255,0));
    animation: float 12s ease-in-out infinite;
}

.hero::before {
    width: 460px;
    height: 460px;
    top: -120px;
    right: -160px;
}

.hero::after {
    width: 360px;
    height: 360px;
    bottom: -100px;
    left: -120px;
    animation-delay: 3s;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    align-items: center;
}

.hero-text h1 span {
    display: block;
    font-size: 0.9rem;
    letter-spacing: 0.38em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.65);
    margin-bottom: 18px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 24px;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.2;
    letter-spacing: 0.06em;
}

.hero p {
    color: rgba(255,255,255,0.82);
    margin: 24px 0;
    font-size: 1.1rem;
}

.hero-visual {
    position: relative;
}

.hero-visual::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.35);
}

.page-hero {
    background: linear-gradient(120deg, rgba(2,28,61,0.9), rgba(28,95,166,0.8));
    color: #fff;
    padding: 120px 0 80px;
}

.page-hero h1 {
    font-size: 2.6rem;
}

.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 0.9rem;
    margin-top: 12px;
    color: rgba(255,255,255,0.75);
}

.breadcrumb a {
    color: rgba(255,255,255,0.85);
}

.split-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    align-items: start;
}

.info-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 26px;
    box-shadow: var(--shadow-soft);
}

.data-list {
    list-style: none;
    display: grid;
    gap: 16px;
}

.data-list li {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed rgba(28,95,166,0.2);
    padding-bottom: 10px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag-list span {
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(28,95,166,0.1);
    font-size: 0.85rem;
}

.list-check {
    list-style: none;
    display: grid;
    gap: 10px;
}

.list-check li::before {
    content: \"✔\";
    color: var(--color-ice-blue);
    margin-right: 8px;
}

/* =============================
   8. Specialized Components
   ============================= */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(127,212,255,0.15);
    color: #fff;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.case-card, .product-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    background: #fff;
}

.case-card img,
.product-card img {
    border-radius: 0;
    height: 240px;
    object-fit: cover;
}

.case-card .content,
.product-card .content {
    padding: 24px;
}

.timeline {
    position: relative;
    padding-left: 40px;
    border-left: 1px solid rgba(28, 95, 166, 0.3);
}

.timeline-item {
    margin-bottom: 32px;
    position: relative;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: -48px;
    top: 8px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, #53e6ff, #1a7dff);
    box-shadow: 0 0 12px rgba(83, 230, 255, 0.6);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.table th,
.table td {
    padding: 16px 20px;
    border-bottom: 1px solid #edf2fb;
    text-align: left;
}

.table th {
    background: #f0f7ff;
    color: var(--color-deep-blue);
}

.lab-panel {
    background: linear-gradient(135deg, rgba(28,95,166,0.12), rgba(127,212,255,0.12));
    border: 1px solid rgba(28,95,166,0.2);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.slider-group {
    display: grid;
    gap: 18px;
}

.slider {
    width: 100%;
}

.process-flow {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
    gap: 18px;
}

.process-step {
    padding: 18px;
    border-radius: var(--radius-md);
    border: 1px dashed rgba(28,95,166,0.3);
    background: rgba(255,255,255,0.9);
    text-align: center;
}

.signal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
    gap: 18px;
}

.signal-card {
    padding: 24px;
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.25);
    backdrop-filter: blur(12px);
}

.progress {
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: rgba(255,255,255,0.2);
    overflow: hidden;
    margin-top: 12px;
}

.progress span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #7fd4ff, #1c5fa6);
}

.feature-list {
    list-style: none;
    display: grid;
    gap: 12px;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.feature-list li::before {
    content: "◆";
    color: var(--color-ice-blue);
    font-size: 0.7rem;
    margin-top: 4px;
}

.badge-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.badge-group .chip {
    margin: 0;
    background: rgba(28,95,166,0.18);
    color: var(--color-deep-blue);
}

.chip.active-chip {
    background: linear-gradient(120deg, #1a7dff, #46d6ff);
    color: #fff;
    box-shadow: 0 6px 18px rgba(28,95,166,0.28);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
    gap: 24px;
}

.contact-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-soft);
}

.media-card {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 18px;
    padding: 18px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(28,95,166,0.1);
    background: #fff;
    box-shadow: var(--shadow-soft);
}

.cta-banner {
    border-radius: var(--radius-lg);
    background: linear-gradient(120deg, #1a7dff, #46d6ff);
    color: #fff;
    padding: 40px;
    box-shadow: var(--shadow-card);
    text-align: center;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.input-field {
    display: flex;
    flex-direction: column;
    font-size: 0.9rem;
    color: var(--color-muted);
}

.input-field input,
.input-field textarea,
.input-field select {
    margin-top: 6px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(28,95,166,0.2);
    background: rgba(255,255,255,0.9);
}

.input-field textarea {
    min-height: 140px;
    resize: vertical;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    text-align: center;
}

.partners-grid div {
    padding: 18px;
    border-radius: var(--radius-md);
    background: #fff;
    box-shadow: var(--shadow-soft);
}

.faq-item {
    border: 1px solid rgba(28,95,166,0.12);
    border-radius: var(--radius-md);
    background: #fff;
    margin-bottom: 16px;
    box-shadow: var(--shadow-soft);
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
    padding: 16px 20px;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item p {
    padding: 0 20px 18px;
}

.footer {
    background: #010b19;
    color: rgba(255,255,255,0.78);
    padding: 48px 0 32px;
    margin-top: 60px;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.footer h4 {
    color: #fff;
    margin-bottom: 12px;
}

.footer a {
    color: rgba(255,255,255,0.78);
    font-size: 0.95rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 16px;
    text-align: center;
    font-size: 0.85rem;
}

/* =============================
   9. Responsive
   ============================= */
@media (max-width: 1024px) {
    .nav-menu {
        gap: 8px;
    }
}

@media (max-width: 820px) {
    .nav-container {
        gap: 12px;
    }
    .nav-menu {
        justify-content: flex-start;
    }
    .nav-actions {
        gap: 8px;
    }
}

@media (max-width: 600px) {
    :root {
        --nav-height: 72px;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    section {
        padding: 60px 0;
    }
    .hero-content {
        grid-template-columns: 1fr;
    }
    .metrics-wrap {
        justify-content: center;
    }
}

/* =============================
   10. Animations
   ============================= */
@keyframes float {
    0% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0); }
}