/* ========================================
   冠速云仓 CrownSpeed - 品牌官网样式
   品牌色：深蓝 #1a2d5a + 金 #d4a843
   ======================================== */

/* CSS 变量 */
:root {
    --navy: #1a2d5a;
    --navy-dark: #0f1b35;
    --navy-light: #243b6a;
    --gold: #d4a843;
    --gold-light: #e8c96a;
    --gold-dark: #b8912e;
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f5;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    --font-cn: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-en: 'Montserrat', -apple-system, sans-serif;
    --shadow-sm: 0 2px 8px rgba(26, 45, 90, 0.08);
    --shadow-md: 0 4px 20px rgba(26, 45, 90, 0.12);
    --shadow-lg: 0 8px 40px rgba(26, 45, 90, 0.16);
    --shadow-gold: 0 4px 20px rgba(212, 168, 67, 0.3);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s 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;
}

body {
    font-family: var(--font-cn);
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

ul { list-style: none; }

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    font-family: var(--font-cn);
}

.btn-gold {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    color: var(--navy-dark);
    border-color: var(--gold);
}

.btn-gold:hover {
    background: linear-gradient(135deg, var(--gold-light), var(--gold));
    box-shadow: var(--shadow-gold);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover {
    border-color: var(--gold);
    color: var(--gold);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-full { width: 100%; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition);
}

.navbar.scrolled {
    background: rgba(15, 27, 53, 0.95);
    backdrop-filter: blur(20px);
    padding: 10px 0;
    box-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon svg {
    width: 40px;
    height: 40px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-cn {
    font-size: 20px;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 2px;
    line-height: 1.2;
}

.logo-en {
    font-family: var(--font-en);
    font-size: 10px;
    font-weight: 700;
    color: var(--gold);
    letter-spacing: 3px;
    line-height: 1;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    font-weight: 500;
    border-radius: 6px;
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--gold);
    background: rgba(212, 168, 67, 0.1);
}

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

/* 语言切换器 */
.lang-switcher {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.1);
    border-radius: 6px;
    overflow: hidden;
}

.lang-btn {
    padding: 5px 10px;
    font-size: 12px;
    font-weight: 600;
    color: rgba(255,255,255,0.6);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-cn);
    line-height: 1;
}

.lang-btn:hover {
    color: var(--white);
    background: rgba(255,255,255,0.1);
}

.lang-btn.active {
    color: var(--gold);
    background: rgba(212, 168, 67, 0.15);
}

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

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

/* ===== 英雄区 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%);
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(212,168,67,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(212,168,67,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(212, 168, 67, 0.15);
    border: 1px solid rgba(212, 168, 67, 0.3);
    border-radius: 50px;
    color: var(--gold);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 2px;
    margin-bottom: 32px;
    animation: fadeInDown 0.8s ease;
}

.hero-title {
    margin-bottom: 24px;
}

.hero-title-line {
    display: block;
    font-size: 56px;
    font-weight: 900;
    color: var(--white);
    line-height: 1.2;
    letter-spacing: 4px;
    animation: fadeInUp 0.8s ease;
}

.hero-title-accent {
    background: linear-gradient(135deg, var(--gold-light), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation-delay: 0.2s;
}

.hero-desc {
    font-size: 18px;
    color: rgba(255,255,255,0.6);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 64px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    animation: fadeInUp 0.8s ease 0.5s both;
}

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

.hero-stat-num {
    font-family: var(--font-en);
    font-size: 40px;
    font-weight: 800;
    color: var(--gold);
    line-height: 1;
}

.hero-stat-unit {
    font-family: var(--font-en);
    font-size: 16px;
    font-weight: 600;
    color: var(--gold);
}

.hero-stat-label {
    display: block;
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    margin-top: 6px;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.hero-scroll a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
}

.scroll-text {
    font-size: 12px;
    letter-spacing: 2px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255,255,255,0.3);
    border-bottom: 2px solid rgba(255,255,255,0.3);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

/* ===== 通用段落 ===== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--gold);
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 900;
    color: var(--navy);
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.section-desc {
    font-size: 16px;
    color: var(--gray-600);
}

/* ===== 关于冠速 ===== */
.about {
    background: var(--gray-50);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.about-card-main {
    grid-row: span 2;
}

.about-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-200);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--gold), var(--navy));
    opacity: 0;
    transition: opacity var(--transition);
}

.about-card:hover {
    border-color: rgba(212, 168, 67, 0.3);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.about-card:hover::before {
    opacity: 1;
}

.about-card-icon {
    width: 48px;
    height: 48px;
    color: var(--gold);
    margin-bottom: 20px;
}

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

.about-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 12px;
}

.about-card p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.7;
}

.about-card-divider {
    width: 40px;
    height: 2px;
    background: var(--gold);
    margin: 20px 0;
}

.about-card-sub {
    font-size: 14px !important;
    color: var(--gray-600);
}

/* ===== 服务优势 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--gray-200);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    border-color: rgba(212, 168, 67, 0.3);
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.service-num {
    font-family: var(--font-en);
    font-size: 64px;
    font-weight: 800;
    color: rgba(26, 45, 90, 0.06);
    position: absolute;
    top: 12px;
    right: 20px;
    line-height: 1;
}

.service-icon {
    width: 56px;
    height: 56px;
    color: var(--navy);
    margin-bottom: 24px;
    transition: color var(--transition);
}

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

.service-card:hover .service-icon {
    color: var(--gold);
}

.service-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 12px;
}

.service-card p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===== 解决方案 ===== */
.solutions {
    background: var(--gray-50);
}

.solutions-tabs {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 28px;
    border: 2px solid var(--gray-300);
    border-radius: 50px;
    background: var(--white);
    color: var(--gray-600);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-cn);
}

.tab-btn:hover {
    border-color: var(--gold);
    color: var(--gold);
}

.tab-btn.active {
    background: var(--navy);
    border-color: var(--navy);
    color: var(--gold);
}

.solution-panel {
    display: none;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    animation: fadeIn 0.4s ease;
}

.solution-panel.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.solution-info {
    padding: 48px;
}

.solution-info h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 16px;
}

.solution-info p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 24px;
}

.solution-features {
    margin-bottom: 32px;
}

.solution-features li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    font-size: 15px;
    color: var(--gray-800);
}

.solution-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 16px;
    height: 16px;
    background: rgba(212, 168, 67, 0.15);
    border-radius: 50%;
}

.solution-features li::after {
    content: '✓';
    position: absolute;
    left: 4px;
    top: 12px;
    font-size: 11px;
    color: var(--gold);
    font-weight: 700;
}

.solution-visual {
    background: linear-gradient(160deg, var(--navy), var(--navy-dark));
    padding: 48px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-content: center;
}

.solution-visual-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    transition: all var(--transition);
}

.solution-visual-card:hover {
    background: rgba(212, 168, 67, 0.1);
    border-color: rgba(212, 168, 67, 0.3);
    transform: translateY(-4px);
}

.svc-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.solution-visual-card span {
    display: block;
    color: rgba(255,255,255,0.8);
    font-size: 14px;
    font-weight: 500;
}

/* ===== 客户案例 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-200);
    transition: all var(--transition);
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.case-category {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(212, 168, 67, 0.1);
    border-radius: 50px;
    color: var(--gold-dark);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
}

.case-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 12px;
}

.case-card > p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 24px;
}

.case-metrics {
    display: flex;
    gap: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

.case-metric-val {
    display: block;
    font-family: var(--font-en);
    font-size: 28px;
    font-weight: 800;
    color: var(--navy);
    line-height: 1;
}

.case-metric-label {
    font-size: 13px;
    color: var(--gray-600);
    margin-top: 4px;
}

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(160deg, var(--navy-dark), var(--navy));
    padding: 80px 0;
}

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

.cta-box h2 {
    font-size: 32px;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.cta-box p {
    color: rgba(255,255,255,0.6);
    font-size: 16px;
    margin-bottom: 32px;
}

.cta-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

/* ===== 联系我们 ===== */
.contact {
    background: var(--gray-50);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: rgba(26, 45, 90, 0.06);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--navy);
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-item h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 15px;
    color: var(--gray-600);
}

.contact-form {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--gray-300);
    border-radius: 8px;
    font-size: 14px;
    font-family: var(--font-cn);
    color: var(--gray-800);
    transition: border-color var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(212, 168, 67, 0.15);
}

.form-group textarea {
    resize: vertical;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--navy-dark);
    padding: 64px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo svg {
    width: 36px;
    height: 36px;
}

.footer-logo-cn {
    display: block;
    font-size: 18px;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 2px;
    line-height: 1.2;
}

.footer-logo-en {
    display: block;
    font-family: var(--font-en);
    font-size: 9px;
    font-weight: 700;
    color: var(--gold);
    letter-spacing: 3px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.4);
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--gold);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.3);
}

/* ===== 回到顶部 ===== */
.back-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--navy);
    border: 2px solid var(--gold);
    color: var(--gold);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-top:hover {
    background: var(--gold);
    color: var(--navy-dark);
    transform: translateY(-4px);
}

.back-top svg {
    width: 20px;
    height: 20px;
}

/* ===== 动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(8px); }
}

/* 滚动进入动画 */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .case-card:last-child {
        grid-column: span 2;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--navy-dark);
        flex-direction: column;
        padding: 80px 32px;
        gap: 8px;
        transition: right var(--transition);
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-actions {
        display: none;
    }

    .hero-title-line {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

    .hero-stat-num {
        font-size: 28px;
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .about-card-main {
        grid-row: auto;
    }

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

    .solution-panel.active {
        grid-template-columns: 1fr;
    }

    .solution-visual {
        padding: 32px;
    }

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

    .case-card:last-child {
        grid-column: auto;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .section {
        padding: 64px 0;
    }
}

@media (max-width: 480px) {
    .hero-title-line {
        font-size: 28px;
    }

    .tab-btn {
        padding: 8px 18px;
        font-size: 13px;
    }

    .solution-info {
        padding: 28px;
    }

    .solution-visual {
        grid-template-columns: 1fr 1fr;
        padding: 24px;
    }

    .cta-box h2 {
        font-size: 24px;
    }

    .cta-actions {
        flex-direction: column;
    }
}