/* ===== Smart Venue - 智慧场馆系统集成商 ===== */
/* 主色调: 科技蓝 #0277BD | 数据青 #00E5FF | 深邃黑 #121212 */

:root {
    --primary: #0277BD;
    --accent: #00E5FF;
    --dark: #121212;
    --dark-secondary: #1E1E1E;
    --text-light: #E0E0E0;
    --text-white: #FFFFFF;
    --gray-100: #F5F5F5;
    --gray-200: #EEEEEE;
    --gray-300: #E0E0E0;
    --gray-600: #757575;
    --gray-800: #424242;
    --gradient-primary: linear-gradient(135deg, #0277BD 0%, #00E5FF 100%);
    --gradient-dark: linear-gradient(180deg, #121212 0%, #1a237e 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.2);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background: var(--text-white);
    overflow-x: hidden;
}

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

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header & Navigation ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 229, 255, 0.1);
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-white);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 0;
}

.main-nav a {
    color: var(--text-light);
    padding: 8px 14px;
    font-size: 0.9rem;
    border-radius: 4px;
    transition: var(--transition);
    white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--accent);
    background: rgba(0, 229, 255, 0.08);
}

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

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

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark);
    overflow: hidden;
    padding-top: 60px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.4;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(18,18,18,0.7) 0%, rgba(18,18,18,0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px 20px;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 20px;
    line-height: 1.3;
}

.hero-content h1 span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--text-light);
    margin-bottom: 32px;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
}

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

.hero-stat .number {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent);
}

.hero-stat .label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(2, 119, 189, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(2, 119, 189, 0.6);
    color: var(--text-white);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

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

/* ===== Section Styles ===== */
.section {
    padding: 80px 0;
}

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

.section-gray {
    background: var(--gray-100);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.section-dark .section-header h2 {
    color: var(--text-white);
}

.section-header p {
    font-size: 1.05rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.section-dark .section-header p {
    color: var(--text-light);
    opacity: 0.8;
}

/* ===== Cards ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--text-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-body {
    padding: 24px;
}

.card-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark);
}

.card-body p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.7;
}

.card-dark {
    background: var(--dark-secondary);
    border: 1px solid rgba(0, 229, 255, 0.1);
}

.card-dark .card-body h3 {
    color: var(--text-white);
}

.card-dark .card-body p {
    color: var(--text-light);
}

/* ===== Feature List ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px 20px;
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-white);
}

.feature-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* ===== Page Banner ===== */
.page-banner {
    position: relative;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark);
    margin-top: 60px;
    overflow: hidden;
}

.page-banner-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.3;
}

.page-banner-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(18,18,18,0.8), rgba(2,119,189,0.4));
}

.page-banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--text-white);
}

.page-banner-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.page-banner-content p {
    font-size: 1.05rem;
    opacity: 0.85;
}

.breadcrumb {
    margin-top: 12px;
    font-size: 0.85rem;
    opacity: 0.7;
}

.breadcrumb a {
    color: var(--text-white);
}

.breadcrumb span {
    margin: 0 8px;
}

/* ===== Content Layout ===== */
.content-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 60px;
}

.content-row.reverse {
    direction: rtl;
}

.content-row.reverse > * {
    direction: ltr;
}

.content-text h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--dark);
}

.content-text h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--dark);
}

.content-text p {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.8;
}

.content-text ul {
    list-style: none;
    padding: 0;
}

.content-text ul li {
    padding: 6px 0 6px 24px;
    position: relative;
    color: var(--gray-800);
}

.content-text ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

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

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

/* ===== Video Section ===== */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* ===== Cases / Projects ===== */
.case-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 300px;
}

.case-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover img {
    transform: scale(1.05);
}

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 24px;
    background: linear-gradient(transparent, rgba(18,18,18,0.9));
    color: var(--text-white);
}

.case-overlay h3 {
    font-size: 1.2rem;
    margin-bottom: 6px;
}

.case-overlay p {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* ===== Form ===== */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--text-white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(2, 119, 189, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--dark);
    color: var(--text-light);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    font-size: 0.9rem;
    margin-top: 12px;
    opacity: 0.8;
    line-height: 1.7;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
    padding: 0;
}

.footer-col ul li {
    margin-bottom: 8px;
}

.footer-col ul li a {
    color: var(--text-light);
    font-size: 0.9rem;
    opacity: 0.8;
    transition: var(--transition);
}

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

.footer-contact p {
    font-size: 0.9rem;
    margin-bottom: 8px;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* ===== Utility ===== */
.text-accent {
    color: var(--accent);
}

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

.mt-20 {
    margin-top: 20px;
}

.mt-40 {
    margin-top: 40px;
}

.mb-20 {
    margin-bottom: 20px;
}

.mb-40 {
    margin-bottom: 40px;
}

/* ===== Lazy Load ===== */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded,
img.loaded {
    opacity: 1;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .content-row {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .content-row.reverse {
        direction: ltr;
    }
    .hero-content h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 768px) {
    .main-nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(18, 18, 18, 0.98);
        flex-direction: column;
        padding: 20px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    .nav-toggle {
        display: flex;
    }
    .hero-content h1 {
        font-size: 1.8rem;
    }
    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }
    .section {
        padding: 50px 0;
    }
    .page-banner {
        height: 240px;
    }
    .page-banner-content h1 {
        font-size: 1.6rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.5rem;
    }
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}