/*
 * 湖南时代金阳科技发展有限公司 官网样式表
 * 依据《企业级官网专业重构方案》以及公司专属设计规划编写
 */

:root {
    --color-primary: #006400;
    --color-secondary: #1E90FF;
    --color-accent: #FFD700;
    --color-text-dark: #333333;
    --color-text-medium: #555555;
    --color-text-light: #FFFFFF;
    --color-background-white: #FFFFFF;
    --color-background-light: #F4F7F5;
    --color-border: #E2E8F0;

    --font-family-main: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    --font-size-base: 16px;
    --font-size-h1: 2.75rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
    --font-size-h4: 1.25rem;

    --spacing-unit: 8px;
    --spacing-xs: calc(var(--spacing-unit) * 0.5);
    --spacing-sm: var(--spacing-unit);
    --spacing-md: calc(var(--spacing-unit) * 2);
    --spacing-lg: calc(var(--spacing-unit) * 4);
    --spacing-xl: calc(var(--spacing-unit) * 6);
    --spacing-xxl: calc(var(--spacing-unit) * 10);

    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --box-shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.06);
    --box-shadow-md: 0 12px 32px rgba(0, 0, 0, 0.08);

    --max-width: 1200px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-main);
    line-height: 1.6;
    font-size: var(--font-size-base);
    color: var(--color-text-dark);
    background-color: var(--color-background-white);
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    color: var(--color-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

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

section {
    padding: var(--spacing-xxl) 0;
}

.section-heading {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-heading p {
    color: var(--color-text-medium);
    max-width: 720px;
    margin: 0 auto;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--box-shadow-sm);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primary);
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--color-text-dark);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    transition: background 0.3s ease, color 0.3s ease;
}

.nav-link:hover,
.nav-item.active .nav-link {
    color: var(--color-primary);
    background: rgba(0, 100, 0, 0.08);
}

.dropdown-menu {
    list-style: none;
    position: absolute;
    left: 0;
    top: calc(100% + 10px);
    background: var(--color-background-white);
    min-width: 200px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow-md);
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s ease;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-text-medium);
}

.dropdown-item a:hover {
    background: var(--color-background-light);
    color: var(--color-secondary);
}

.nav-cta {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-secondary);
    color: var(--color-text-light);
    border-radius: var(--border-radius-md);
    font-weight: 600;
}

.nav-cta:hover {
    background: #1870cf;
    color: var(--color-text-light);
}

.header-spacer {
    height: 90px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-xl);
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-light);
}

.btn-primary:hover {
    background: #004a00;
}

.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-text-light);
}

.btn-secondary:hover {
    background: #186ed0;
}

.btn-outline {
    border: 1px solid var(--color-secondary);
    color: var(--color-secondary);
    background: transparent;
}

.btn-outline:hover {
    background: rgba(30, 144, 255, 0.08);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    color: var(--color-text-light);
    padding: var(--spacing-xxl) 0;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    border-bottom-left-radius: var(--border-radius-lg);
    border-bottom-right-radius: var(--border-radius-lg);
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 720px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(0, 100, 0, 0.85);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 999px;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: 3.2rem;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-stats {
    margin-top: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.hero-stat {
    min-width: 160px;
}

.hero-stat span {
    display: block;
    font-size: 2rem;
    font-weight: 700;
}

.hero-stat small {
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Cards & Surfaces */
.card {
    background: var(--color-background-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow-sm);
    height: 100%;
}

.card h3 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--color-text-medium);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: rgba(30, 144, 255, 0.1);
    color: var(--color-secondary);
    font-weight: 700;
    font-size: 1.2rem;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-xl);
    background: var(--color-background-white);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--box-shadow-sm);
}

.stat-card span {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-card p {
    color: var(--color-text-medium);
    margin-top: var(--spacing-sm);
}

/* Feature Lists */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background: var(--color-background-white);
    box-shadow: var(--box-shadow-sm);
}

.feature-item h4 {
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    color: var(--color-text-medium);
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 999px;
    background: rgba(30, 144, 255, 0.12);
    color: var(--color-secondary);
    font-size: 0.85rem;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background: var(--color-secondary);
    box-shadow: 0 0 0 6px rgba(30, 144, 255, 0.2);
}

.timeline-year {
    font-weight: 700;
    color: var(--color-primary);
}

.timeline-content {
    background: var(--color-background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-sm);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background: var(--color-background-light);
    font-weight: 600;
}

tr:last-child td {
    border-bottom: none;
}

/* News */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.news-card {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow-sm);
    background: var(--color-background-white);
    display: flex;
    flex-direction: column;
}

.news-card img {
    border-radius: 0;
}

.news-content {
    padding: var(--spacing-lg);
    flex: 1;
}

.news-meta {
    font-size: 0.9rem;
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-sm);
}

.news-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

/* Case Cards */
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.case-card {
    background: var(--color-background-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow-sm);
    display: flex;
    flex-direction: column;
}

.case-card img {
    border-radius: 0;
}

.case-card-content {
    padding: var(--spacing-lg);
    flex: 1;
}

.case-card-content h3 {
    margin-bottom: var(--spacing-sm);
}

.case-card-content p {
    color: var(--color-text-medium);
}

.case-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.meta-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 999px;
    background: rgba(0, 100, 0, 0.08);
    color: var(--color-primary);
    font-size: 0.85rem;
}

/* Partners */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-lg);
    align-items: center;
}

.partner-card {
    background: var(--color-background-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--box-shadow-sm);
    min-height: 140px;
}

/* Careers */
.career-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.career-item {
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xl);
}

.career-item h3 {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.career-meta {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin: var(--spacing-sm) 0 var(--spacing-md);
    color: var(--color-text-medium);
}

.benefit-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.contact-card {
    background: var(--color-background-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-sm);
}

.contact-info {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.contact-info li span {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-medium);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.contact-info li strong {
    font-size: 1.1rem;
    color: var(--color-text-dark);
}

form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

input, textarea, select {
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
    font-size: 1rem;
    font-family: var(--font-family-main);
    transition: border 0.3s ease;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

textarea {
    min-height: 160px;
    resize: vertical;
}

/* Utility */
.bg-light {
    background: var(--color-background-light);
}

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

.highlight {
    color: var(--color-secondary);
}

.split-layout {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    align-items: center;
}

.list-check {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.list-check li {
    padding-left: 28px;
    position: relative;
    color: var(--color-text-medium);
}

.list-check li::before {
    content: "✔";
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.data-highlight {
    background: rgba(255, 215, 0, 0.12);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    color: #b38600;
    font-weight: 600;
}

.tag-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    border-radius: 999px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 100, 0, 0.08);
    color: var(--color-primary);
    font-size: 0.85rem;
}

/* Legal & Sitemap */
.legal-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.legal-item {
    background: var(--color-background-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-sm);
}

.sitemap-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.sitemap-column h4 {
    margin-bottom: var(--spacing-md);
}

.sitemap-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Footer */
.footer {
    background: #0f1d15;
    color: rgba(255, 255, 255, 0.86);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer h4 {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.footer ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-bottom {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

/* Responsive */
@media (max-width: 1200px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .case-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
    .partner-grid { grid-template-columns: repeat(3, 1fr); }
    .split-layout, .contact-grid { grid-template-columns: 1fr; }
    .sitemap-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .grid-2,
    .grid-3,
    .grid-4,
    .stat-grid,
    .case-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

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

    .hero {
        min-height: 60vh;
    }

    .hero-title {
        font-size: 2.2rem;
    }
}

@media (max-width: 520px) {
    .nav-menu {
        flex-direction: column;
        align-items: flex-start;
    }

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

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