/*
 * 文件名: style.css
 * 描述: 山东信发华源铝业有限公司官网 主样式文件（重构版）
 */

@import url('variables.css');

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    color: var(--color-text-dark);
    background-color: var(--color-background);
    line-height: 1.7;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: all 0.25s ease;
}

a:hover {
    color: var(--color-accent-dark);
}

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

h1 { font-size: 2.6rem; }
h2 { font-size: 2.1rem; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.25rem; }

/* 容器与栅格 */
.container {
    width: 92%;
    max-width: 1260px;
    margin: 0 auto;
}

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

.section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.section-header .subtitle {
    color: var(--color-text-muted);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.02em;
}

.section-header h2 {
    margin: 0;
}

.section-header p {
    color: var(--color-text-muted);
}

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

.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(200px, 1fr));
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-medium);
    background-color: var(--color-accent-muted);
    color: var(--color-accent-dark);
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
    font-weight: var(--font-weight-semibold);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 18px;
    border-radius: var(--border-radius-sm);
    font-weight: var(--font-weight-semibold);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover { background: var(--color-primary-dark); }

.btn-secondary {
    background: var(--color-white);
    color: var(--color-primary-dark);
    border-color: var(--color-secondary);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255,255,255,0.3);
}

.btn-ghost:hover {
    border-color: var(--color-white);
}

.btn-text {
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

/* 顶部与导航 */
.topbar {
    background: var(--color-primary-dark);
    color: var(--color-white);
    font-size: var(--font-size-small);
}

.topbar .topbar-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    padding: 10px 0;
}

.topbar span, .topbar a {
    color: var(--color-white);
    opacity: 0.9;
}

.site-header,
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    height: 76px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary-dark);
    font-weight: var(--font-weight-bold);
    font-size: 1.4rem;
}

.logo-mark {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--color-primary);
    color: var(--color-white);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
}

.logo-text small {
    display: block;
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: var(--font-weight-medium);
}

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

.nav-item {
    position: relative;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-text-dark);
    font-weight: var(--font-weight-medium);
    padding: 8px 10px;
    border-radius: var(--border-radius-sm);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: var(--color-secondary-light);
}

.nav-cta .nav-link {
    padding: 0;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 110%;
    left: 0;
    background: var(--color-white);
    min-width: 200px;
    list-style: none;
    padding: 8px 0;
    box-shadow: var(--shadow-md);
    border-radius: var(--border-radius-sm);
    border-top: 3px solid var(--color-highlight);
}

.dropdown-item .dropdown-link {
    display: block;
    padding: 10px 14px;
    color: var(--color-text-dark);
}

.dropdown-link:hover {
    background: var(--color-secondary-light);
    color: var(--color-primary);
}

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

.menu-toggle {
    display: none;
    font-size: 1.4rem;
    color: var(--color-primary);
    cursor: pointer;
}

.main-content {
    padding-top: 130px;
}

/* 英雄区 */
.hero {
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    background: var(--color-white);
}

.hero-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-title {
    font-size: 2.4rem;
    margin-bottom: var(--spacing-md);
}

.hero-lead {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.hero-panel {
    background: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.hero-panel::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0));
    pointer-events: none;
}

.hero-panel .eyebrow {
    color: rgba(255,255,255,0.7);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-card {
    background: rgba(255,255,255,0.08);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
}

.stat-card strong {
    display: block;
    font-size: 1.5rem;
    color: var(--color-white);
}

.stat-card span {
    color: rgba(255,255,255,0.8);
    font-size: var(--font-size-small);
}

/* 卡片与模块 */
.card {
    background: var(--color-surface);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid #e6ebf2;
}

.card-quiet {
    border: 1px dashed var(--color-secondary);
    background: var(--color-secondary-light);
}

.list-inline {
    display: inline-flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background: var(--color-secondary-light);
    color: var(--color-text-dark);
    border-radius: 999px;
    font-size: var(--font-size-small);
}

.flow-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-lg);
    position: relative;
}

.flow-step {
    background: var(--color-white);
    border: 1px solid #e6ebf2;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.flow-step::after {
    content: "";
    position: absolute;
    right: -18px;
    top: 50%;
    width: 28px;
    height: 2px;
    background: var(--color-highlight);
    transform: translateY(-50%);
}

.flow-step:last-child::after {
    display: none;
}

.flow-step strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary-dark);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.metric {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background: var(--color-secondary-light);
    border: 1px dashed var(--color-secondary);
}

.metric strong {
    font-size: 1.3rem;
}

.highlight {
    color: var(--color-highlight);
    font-weight: var(--font-weight-bold);
}

.media-card img {
    border-radius: var(--border-radius-md);
}

.pillar-card {
    display: grid;
    grid-template-rows: 200px 1fr;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--color-white);
    border: 1px solid #e6ebf2;
}

.pillar-card .body {
    padding: var(--spacing-md);
    display: grid;
    gap: var(--spacing-sm);
}

.pillars-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.pillars-meta .tag {
    background: var(--color-accent-muted);
    color: var(--color-accent-dark);
}

.case-card,
.news-card {
    display: grid;
    grid-template-rows: 180px 1fr;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid #e6ebf2;
    background: var(--color-white);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.case-card:hover,
.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.case-card .body,
.news-card .body {
    padding: var(--spacing-md);
    display: grid;
    gap: var(--spacing-sm);
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--color-secondary-light);
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
}

.timeline {
    border-left: 3px solid var(--color-secondary);
    padding-left: var(--spacing-lg);
    margin-left: var(--spacing-sm);
    display: grid;
    gap: var(--spacing-md);
}

.timeline-item {
    position: relative;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-highlight);
    border: 3px solid var(--color-white);
    box-shadow: 0 0 0 3px var(--color-secondary-light);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
    background: var(--color-white);
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 12px 14px;
    border-bottom: 1px solid #e6ebf2;
    text-align: left;
}

.data-table thead {
    background: var(--color-secondary-light);
}

.callout {
    background: var(--color-accent-muted);
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-dark);
}

.cta-band {
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    display: grid;
    grid-template-columns: 1.2fr auto;
    align-items: center;
    gap: var(--spacing-lg);
}

.cta-band h3,
.cta-band p {
    color: var(--color-white);
    margin: 0;
}

/* 内页通用 */
.page-hero {
    position: relative;
    background-size: cover;
    background-position: center;
    color: var(--color-white);
    padding: 120px 0 80px;
}

.page-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(9, 35, 66, 0.6);
}

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

.page-hero h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.breadcrumb {
    color: rgba(255,255,255,0.85);
    font-size: var(--font-size-small);
}

.page-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-xl);
}

.sidebar {
    background: var(--color-white);
    border: 1px solid #e6ebf2;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    position: sticky;
    top: 120px;
    height: fit-content;
}

.sidebar h3 {
    margin-bottom: var(--spacing-md);
}

.sidebar-menu {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
}

.sidebar-menu a {
    display: block;
    padding: 10px 12px;
    color: var(--color-text-dark);
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: var(--color-secondary-light);
    border-color: var(--color-secondary);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

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

.content img {
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.content h2, .content h3 {
    color: var(--color-primary-dark);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background: var(--color-white);
    border: 1px solid #e6ebf2;
}

.spec-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
    padding-left: 0;
}

.spec-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
}

.spec-list i {
    color: var(--color-highlight);
}

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

.news-item {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border: 1px solid #e6ebf2;
}

.news-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

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

.contact-card {
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--border-radius-md);
    border: 1px solid #e6ebf2;
}

.footer {
    background: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.footer h4 {
    color: var(--color-white);
}

.footer a {
    color: rgba(255,255,255,0.9);
}

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

.footer .footer-bottom {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: var(--font-size-small);
    color: rgba(255,255,255,0.75);
}

/* 表单 */
input, textarea, select {
    width: 100%;
    padding: 12px 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid #d9dfe8;
    background: var(--color-white);
    font-family: var(--font-family-primary);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 165, 216, 0.15);
}

/* 响应式 */
@media (max-width: 991px) {
    .topbar .topbar-grid {
        flex-direction: column;
        align-items: flex-start;
    }

    .navbar {
        height: 64px;
    }

    .menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        left: 0;
        top: 64px;
        width: 100%;
        background: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: var(--spacing-sm) 0;
        display: none;
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        width: 100%;
        padding: 12px var(--spacing-lg);
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        width: 100%;
    }

    .dropdown-link {
        padding-left: var(--spacing-xl);
    }

    .main-content {
        padding-top: 120px;
    }

    .page-layout {
        grid-template-columns: 1fr;
    }

    .hero {
        padding-top: var(--spacing-xl);
    }

    .cta-band {
        grid-template-columns: 1fr;
    }
}