/*
 * 文件名: style.css
 * 描述: 桂林市思奇通信设备有限公司官网核心样式表
 * 包含: CSS变量系统, 响应式Grid布局, 通用样式, 固定导航栏样式
 */

/* -------------------------------------------------------------------------- */
/*                            1. CSS 变量系统 (Design Tokens)                 */
/* -------------------------------------------------------------------------- */

:root {
    /* 颜色 Color Palette */
    --color-primary: #0A4C86; /* 科技蓝 - 主色调 */
    --color-accent: #FF8C00;  /* 活力橙 - 强调色 */
    --color-background-light: #F8F8F8; /* 浅背景色 */
    --color-background-dark: #1E1E1E;  /* 深背景色 (页脚/特殊模块) */
    --color-text-dark: #333333; /* 主文本色 */
    --color-text-light: #FFFFFF; /* 浅文本色 */
    --color-border: #E0E0E0; /* 边框/分割线 */

    /* 字体 Typography */
    --font-family-main: "Microsoft YaHei", "PingFang SC", sans-serif;
    --font-family-heading: "Arial", sans-serif;
    --font-size-base: 16px;
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
    --font-size-small: 0.875rem;

    /* 间距 Spacing */
    --spacing-xs: 0.5rem;
    --spacing-base: 1rem;   /* 16px */
    --spacing-medium: 1.5rem;
    --spacing-large: 2rem;  /* 32px */
    --spacing-xl: 4rem;

    /* 圆角 Border Radius */
    --border-radius-small: 4px;
    --border-radius-medium: 8px;
    --border-radius-large: 12px;

    /* 阴影 Box Shadow */
    --box-shadow-card: 0 4px 8px rgba(0, 0, 0, 0.1);
    --box-shadow-nav: 0 2px 4px rgba(0, 0, 0, 0.05);
    --box-shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.15);
}

/* -------------------------------------------------------------------------- */
/*                                2. 通用样式 Reset & Base                    */
/* -------------------------------------------------------------------------- */

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

body {
    font-family: var(--font-family-main);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: #FFFFFF; /* 主体白色背景 */
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    margin-bottom: var(--spacing-medium);
    color: var(--color-primary);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-base);
}

.hero {
    position: relative;
    margin-top: 80px;
    padding: var(--spacing-xl) var(--spacing-base);
    background: linear-gradient(135deg, rgba(10, 76, 134, 0.95) 0%, rgba(26, 106, 184, 0.95) 100%);
    color: var(--color-text-light);
    overflow: hidden;
}

.hero::before,
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.35;
    pointer-events: none;
    background-size: 180%;
    background-repeat: no-repeat;
    animation: heroWave 12s ease-in-out infinite alternate;
}

.hero::before {
    background-image:
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.2) 0%, transparent 55%),
        radial-gradient(circle at 80% 30%, rgba(0, 174, 255, 0.25) 0%, transparent 55%);
}

.hero::after {
    background-image: url("../images/TPRIqh8b2NyZ.png");
    mix-blend-mode: screen;
    transform: scale(1.05);
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--spacing-large);
}

.hero h1,
.hero h2,
.hero h3,
.hero p {
    color: var(--color-text-light);
}

.hero h1 {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    line-height: 1.2;
}

.hero p {
    max-width: 720px;
    margin: 0 auto;
    font-size: 1.1rem;
    opacity: 0.95;
}

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

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-base);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    color: var(--color-text-light);
    font-size: var(--font-size-small);
    letter-spacing: 0.5px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-base);
}

.hero-actions--left {
    justify-content: flex-start;
}

.hero-actions--spaced {
    margin-top: var(--spacing-large);
}

.btn-secondary {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-medium);
    background-color: var(--color-accent);
    color: var(--color-text-light);
    border-radius: var(--border-radius-small);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.btn-secondary:hover {
    background-color: #e67e00;
    box-shadow: var(--box-shadow-hover);
}

.section {
    padding: var(--spacing-xl) var(--spacing-base);
}

.section--alt {
    background-color: var(--color-background-light);
}

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

.section-title h2 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.section-title p {
    color: #555;
    max-width: 720px;
    margin: 0 auto;
}

.stats {
    display: grid;
    gap: var(--spacing-large);
    text-align: center;
}

.stat-card {
    background: linear-gradient(135deg, rgba(10, 76, 134, 0.12) 0%, rgba(255, 140, 0, 0.05) 100%);
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-large);
    border: 1px solid rgba(10, 76, 134, 0.2);
}

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.stat-card p {
    color: #555;
}

.signal-card {
    position: relative;
    overflow: hidden;
}

.signal-card::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: url("../images/VnACzMcwOIIz.png");
    background-size: cover;
    background-position: center;
    opacity: 0.12;
    pointer-events: none;
}

.card--transparent {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: grid;
    place-items: center;
    margin: 0 auto var(--spacing-base);
    background: linear-gradient(145deg, rgba(10, 76, 134, 0.15) 0%, rgba(255, 140, 0, 0.25) 100%);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--color-primary);
}

.media-card {
    display: grid;
    gap: var(--spacing-base);
}

.media-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: var(--border-radius-medium);
}

.media-card-content h3 {
    margin-bottom: var(--spacing-xs);
}

.media-card-content p {
    color: #555;
}

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

.signals-grid .card {
    display: grid;
    gap: var(--spacing-base);
}

.pill-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.pill-list--spaced {
    margin-top: var(--spacing-large);
}

.pill {
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: rgba(10, 76, 134, 0.08);
    color: var(--color-primary);
    font-size: 0.85rem;
}

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

.news-item {
    display: grid;
    gap: var(--spacing-base);
    padding: var(--spacing-large);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--border-radius-medium);
    background: #fff;
    box-shadow: var(--box-shadow-card);
}

.news-item h4 {
    color: var(--color-primary);
}

.news-item .date {
    font-size: var(--font-size-small);
    color: #999;
}

.news-item p {
    color: #666;
}

.partners {
    display: grid;
    gap: var(--spacing-base);
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    align-items: center;
}

.partner-card {
    display: grid;
    place-items: center;
    padding: var(--spacing-base);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-medium);
    background: #fff;
}

.cta-banner {
    position: relative;
    padding: var(--spacing-xl) var(--spacing-base);
    background: linear-gradient(145deg, #062f53 0%, #0a4c86 50%, #0f6cb4 100%);
    color: var(--color-text-light);
    border-radius: var(--border-radius-large);
    overflow: hidden;
}

.cta-banner::after {
    content: "";
    position: absolute;
    inset: -30%;
    background: radial-gradient(circle, rgba(0, 174, 255, 0.35) 0%, transparent 60%);
    animation: pulse 12s ease-in-out infinite;
}

.cta-banner-content {
    position: relative;
    z-index: 1;
    text-align: center;
    display: grid;
    gap: var(--spacing-base);
}

.cta-banner-content h3 {
    color: var(--color-text-light);
}

.cta-banner-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-base);
}

.breadcrumb {
    padding: var(--spacing-base);
    background-color: var(--color-background-light);
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-small);
}

.breadcrumb a {
    color: var(--color-primary);
    margin: 0 var(--spacing-xs);
}

.layout-2col {
    display: grid;
    gap: var(--spacing-large);
}

.layout-2col--reverse {
    align-items: center;
}

.layout-2col + .layout-2col {
    margin-top: var(--spacing-xl);
}

.layout-2col img {
    border-radius: var(--border-radius-medium);
    box-shadow: var(--box-shadow-card);
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-large);
    font-size: 0.95rem;
}

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

.table th {
    background: rgba(10, 76, 134, 0.08);
    color: var(--color-primary);
}

.list {
    list-style: none;
    display: grid;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-base);
}

.list li {
    position: relative;
    padding-left: 1.25rem;
    color: #555;
}

.list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 1.2rem;
    line-height: 1;
}

.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
    border-left: 2px solid rgba(10, 76, 134, 0.3);
}

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

.timeline-item::before {
    content: "";
    position: absolute;
    left: -var(--spacing-xl);
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
}

.timeline-year {
    font-weight: bold;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.tag {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 999px;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

blockquote {
    margin: var(--spacing-large) 0;
    padding: var(--spacing-large);
    background: rgba(10, 76, 134, 0.08);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--border-radius-medium);
    color: #444;
}

.contact-info {
    display: grid;
    gap: var(--spacing-large);
}

.network-map {
    position: relative;
    min-height: 320px;
    border-radius: var(--border-radius-medium);
    overflow: hidden;
    background: url("../images/L67vJJOmgQcB.jpeg") center/cover no-repeat;
}

.network-map::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10, 76, 134, 0.65), rgba(26, 106, 184, 0.45));
}

.network-map-content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-large);
    color: var(--color-text-light);
}

form {
    display: grid;
    gap: var(--spacing-base);
}

label {
    font-weight: 600;
    color: var(--color-primary);
}

input,
textarea,
select {
    padding: var(--spacing-base);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-small);
    font: inherit;
    transition: border 0.3s ease, box-shadow 0.3s ease;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(10, 76, 134, 0.1);
    outline: none;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-base);
    margin-top: var(--spacing-base);
}

.table--spec td:first-child {
    width: 35%;
    font-weight: 600;
    color: var(--color-primary);
}

.badge--light {
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.solutions-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
    margin-bottom: var(--spacing-large);
}

.solutions-nav a {
    padding: 0.5rem 1rem;
    border-radius: 999px;
    border: 1px solid rgba(10, 76, 134, 0.2);
    background: rgba(10, 76, 134, 0.05);
    color: var(--color-primary);
    transition: all 0.3s ease;
}

.solutions-nav a:hover {
    border-color: var(--color-primary);
    background: rgba(10, 76, 134, 0.15);
}

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

.case-card {
    display: grid;
    gap: var(--spacing-base);
}

.case-card img {
    border-radius: var(--border-radius-medium);
    height: 240px;
    object-fit: cover;
}

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

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

.career-card {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-large);
}

.career-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-base);
    font-size: var(--font-size-small);
    color: #666;
}

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

.sitemap-section h3 {
    margin-bottom: var(--spacing-base);
}

.sitemap-section ul {
    list-style: none;
    display: grid;
    gap: 0.35rem;
}

/* -------------------------------------------------------------------------- */
/*                           3. 响应式 Grid 布局 (Grid System)                */
/* -------------------------------------------------------------------------- */

.grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr); /* 默认单列 */
    gap: var(--spacing-large);
    margin-bottom: var(--spacing-xl);
}

/* 桌面端 (Desktop) */
@media (min-width: 1024px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* 平板端 (Tablet) */
@media (min-width: 768px) and (max-width: 1023px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-md-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-md-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* -------------------------------------------------------------------------- */
/*                           4. 固定导航栏 (Fixed Navigation)                 */
/* -------------------------------------------------------------------------- */

.header-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-text-light); /* 白色背景 */
    box-shadow: var(--box-shadow-nav);
    z-index: 1000;
}

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

.logo {
    font-size: var(--font-size-h3);
    font-weight: bold;
    color: var(--color-primary);
    letter-spacing: 1px;
    white-space: nowrap;
}

.nav-menu {
    list-style: none;
    display: flex;
}

.nav-item {
    position: relative;
    padding: 0 var(--spacing-base);
}

.nav-link {
    display: block;
    padding: var(--spacing-xs) 0;
    color: var(--color-text-dark);
    font-weight: 500;
}

.nav-link:hover {
    color: var(--color-accent);
}

/* 二级下拉菜单 (Dropdown Menu) */
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%; /* 位于父菜单项下方 */
    left: 0;
    min-width: 160px;
    background-color: var(--color-text-light);
    box-shadow: var(--box-shadow-card);
    list-style: none;
    padding: var(--spacing-xs) 0;
    border-radius: var(--border-radius-small);
    z-index: 10;
}

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

.dropdown-item a {
    padding: var(--spacing-xs) var(--spacing-base);
    display: block;
    color: var(--color-text-dark);
}

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

/* 移动端菜单隐藏 (Mobile Menu Toggle - 仅在桌面端显示菜单) */
@media (max-width: 1023px) {
    .nav-menu {
        display: none; /* 移动端默认隐藏，需要JS控制 */
    }
    .nav-toggle {
        display: block; /* 移动端显示汉堡包按钮 */
    }
}

/* -------------------------------------------------------------------------- */
/*                               5. 按钮和卡片 (Components)                   */
/* -------------------------------------------------------------------------- */

.btn-primary {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-medium);
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border-radius: var(--border-radius-small);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
    background-color: #07365C; /* Primary Color Darkened */
    box-shadow: var(--box-shadow-hover);
}

.card {
    background-color: var(--color-text-light);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-large);
    box-shadow: var(--box-shadow-card);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

/* -------------------------------------------------------------------------- */
/*                               6. 页脚 (Footer)                             */
/* -------------------------------------------------------------------------- */

.footer {
    background-color: var(--color-background-dark);
    color: var(--color-text-light);
    padding: var(--spacing-xl) 0;
    font-size: var(--font-size-small);
}

.footer a {
    color: var(--color-text-light);
    opacity: 0.8;
}

.footer a:hover {
    color: var(--color-accent);
    opacity: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-large);
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-section h4 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-base);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-xs);
}

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

@keyframes heroWave {
    from {
        background-position: 0% 50%;
        opacity: 0.25;
    }
    to {
        background-position: 100% 50%;
        opacity: 0.4;
    }
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.85;
    }
}

@media (min-width: 768px) {
    .stats {
        grid-template-columns: repeat(3, 1fr);
    }
    .signals-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .layout-2col {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: center;
    }
    .case-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .career-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .news-list {
        grid-template-columns: repeat(2, 1fr);
    }
}