/* ============================
   辰宇世嘉官网样式 - 设计系统
   ============================ */

/* CSS 变量 */
:root {
    /* 主色 */
    --color-primary: #1E50A2;
    --color-primary-dark: #153E7A;
    --color-primary-light: #2A6BD6;

    /* 辅色 */
    --color-secondary: #3B82F6;
    --color-accent: #06B6D4;

    /* 背景 */
    --color-bg: #FFFFFF;
    --color-bg-light: #F8FAFC;
    --color-bg-dark: #1E293B;

    /* 文字 */
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-light: #FFFFFF;

    /* 边框 */
    --color-border: #E2E8F0;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(30, 80, 162, 0.12);
    --shadow-xl: 0 16px 48px rgba(30, 80, 162, 0.16);

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 字号 */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 40px;
    --font-size-4xl: 48px;
    --font-size-5xl: 64px;

    /* 间距 */
    --section-padding: 80px;
    --section-padding-mobile: 48px;

    /* 容器 */
    --container-max: 1200px;
    --container-padding: 24px;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-padding-top: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
                 "Segoe UI", Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* 工具类 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

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

.section-tag {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-size: var(--font-size-3xl);
    color: var(--color-text);
    margin-bottom: 16px;
}

.section-desc {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================
   导航栏
   ============================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 72px;
    background: transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    font-size: 24px;
    color: var(--color-primary);
    line-height: 1;
}

.logo-text {
    color: var(--color-primary);
}

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

.nav-menu ul {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--color-primary);
    background: rgba(30, 80, 162, 0.06);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 24px;
}

.nav-link.active {
    color: var(--color-primary);
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============================
   首屏 Banner
   ============================ */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 72px;
    background: linear-gradient(135deg, #F8FAFC 0%, #EBF4FF 100%);
    position: relative;
    overflow: hidden;
}

.hero-container {
    display: flex;
    align-items: center;
    gap: 60px;
    padding-top: 60px;
    padding-bottom: 60px;
}

.hero-content {
    flex: 1;
    max-width: 560px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    color: var(--color-text);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: 36px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-visual {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.hero-graphic {
    width: 100%;
    max-width: 480px;
    height: 400px;
    background:
        radial-gradient(circle at 30% 40%, rgba(30, 80, 162, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(59, 130, 246, 0.10) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.06) 0%, transparent 60%);
    border-radius: var(--radius-xl);
    position: relative;
    animation: float 6s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
}

.emoji-center {
    font-size: 100px;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 8px 24px rgba(30, 80, 162, 0.2));
}

.emoji-float {
    position: absolute;
    font-size: 36px;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.1));
    animation: floatEmoji 4s ease-in-out infinite;
}

.emoji-1 { top: 12%; left: 15%; animation-delay: 0s; }
.emoji-2 { top: 20%; right: 12%; animation-delay: 0.8s; }
.emoji-3 { bottom: 22%; left: 20%; animation-delay: 1.6s; }
.emoji-4 { bottom: 15%; right: 18%; animation-delay: 2.4s; }
.emoji-5 { top: 45%; left: 6%; animation-delay: 3.2s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

@keyframes floatEmoji {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-16px) scale(1.1); }
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.3; }
}

/* 统计数据 */
.hero-stats {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    margin-top: auto;
}

.stats-container {
    display: flex;
    justify-content: center;
    gap: 80px;
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-top: 4px;
}

/* ============================
   服务领域
   ============================ */

.services {
    padding: var(--section-padding) 0;
    background: var(--color-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    transition: all var(--transition-base);
    cursor: default;
}

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

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    line-height: 1;
    position: relative;
}

.card-title {
    font-size: var(--font-size-lg);
    margin-bottom: 8px;
    color: var(--color-text);
}

.card-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================
   我们的优势
   ============================ */

.advantages {
    padding: var(--section-padding) 0;
    background: var(--color-bg-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.advantage-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 36px 32px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: all var(--transition-base);
}

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

.adv-icon {
    font-size: 36px;
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(30, 80, 162, 0.08);
    border-radius: var(--radius-sm);
}

.adv-title {
    font-size: var(--font-size-lg);
    margin-bottom: 6px;
    color: var(--color-text);
}

.adv-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================
   关于我们
   ============================ */

.about {
    padding: var(--section-padding) 0;
    background: var(--color-bg);
}

.about-container {
    display: flex;
    align-items: center;
    gap: 60px;
}

.about-content {
    flex: 1;
}

.about-content .section-tag {
    text-align: left;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.about-visual {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 360px;
}

.about-graphic {
    width: 100%;
    max-width: 420px;
    height: 360px;
    background:
        radial-gradient(circle at 40% 50%, rgba(30, 80, 162, 0.10) 0%, transparent 60%),
        radial-gradient(circle at 60% 40%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        linear-gradient(135deg, #EBF4FF 0%, #F0F9FF 100%);
    border-radius: var(--radius-xl);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-graphic .emoji-center {
    font-size: 88px;
}

.emoji-a1 { top: 10%; left: 18%; animation-delay: 0.3s; font-size: 30px; }
.emoji-a2 { top: 18%; right: 15%; animation-delay: 1.2s; font-size: 34px; }
.emoji-a3 { bottom: 20%; left: 15%; animation-delay: 2.1s; font-size: 32px; }
.emoji-a4 { bottom: 12%; right: 20%; animation-delay: 2.8s; font-size: 28px; }

/* ============================
   联系我们
   ============================ */

.contact {
    padding: var(--section-padding) 0;
    background: var(--color-bg-light);
}

.contact-info {
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    background: var(--color-bg);
    padding: 28px 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.contact-item:hover {
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.contact-icon {
    font-size: 28px;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(30, 80, 162, 0.08);
    border-radius: var(--radius-sm);
}

.contact-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.contact-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text);
}

.contact-link {
    color: var(--color-primary);
}

.contact-link:hover {
    color: var(--color-primary-dark);
}

/* ============================
   Footer
   ============================ */

.footer {
    background: var(--color-bg-dark);
    padding: 32px 0;
    text-align: center;
}

.footer-text {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

/* ============================
   移动端响应式
   ============================ */

@media (max-width: 1024px) {
    .hero-container {
        gap: 40px;
    }

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

    .about-container {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: var(--section-padding-mobile);
        --font-size-3xl: 32px;
        --font-size-4xl: 36px;
        --font-size-5xl: 42px;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        flex-direction: column;
        justify-content: flex-start;
        padding: 32px 24px;
        transform: translateX(100%);
        transition: transform var(--transition-base);
        overflow-y: auto;
    }

    .nav-menu.open {
        transform: translateX(0);
    }

    .nav-menu ul {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .nav-link {
        padding: 16px;
        font-size: var(--font-size-lg);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-link::after {
        display: none;
    }

    .nav-link.active {
        background: rgba(30, 80, 162, 0.06);
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
        padding-top: 40px;
        padding-bottom: 40px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-visual {
        min-height: 280px;
    }

    .hero-graphic {
        max-width: 320px;
        height: 280px;
    }

    .emoji-center {
        font-size: 72px;
    }

    .emoji-float {
        font-size: 28px;
    }

    .about-graphic .emoji-center {
        font-size: 64px;
    }

    .stats-container {
        gap: 32px;
    }

    .stat-number {
        font-size: var(--font-size-2xl);
    }

    .section-header {
        margin-bottom: 40px;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .about-container {
        flex-direction: column;
    }

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

    .about-content .section-tag,
    .about-content .section-title {
        text-align: center;
    }

    .contact-item {
        padding: 24px 20px;
    }

    .contact-value {
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-3xl: 28px;
        --font-size-4xl: 32px;
        --font-size-5xl: 36px;
    }

    .container {
        padding: 0 16px;
    }

    .btn {
        padding: 12px 24px;
        font-size: var(--font-size-sm);
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .stats-container {
        flex-direction: column;
        gap: 20px;
    }
}