/* 乌克兰主题色彩变量 */
:root {
    --ukraine-blue: #005BBB;
    --ukraine-yellow: #FFD700;
    --ukraine-blue-light: #1e7fcf;
    --ukraine-blue-dark: #003d7a;
    --ukraine-yellow-light: #fff3a0;
    --ukraine-yellow-dark: #ccaa00;

    /* 中性色 */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* 字体 */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 91, 187, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 91, 187, 0.1), 0 2px 4px -1px rgba(0, 91, 187, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 91, 187, 0.1), 0 4px 6px -2px rgba(0, 91, 187, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 91, 187, 0.1), 0 10px 10px -5px rgba(0, 91, 187, 0.04);

    /* 边距 */
    --border-radius: 0.75rem;
    --border-radius-sm: 0.375rem;
    --border-radius-lg: 1rem;

    /* 动画 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--ukraine-yellow);
    min-height: 100vh;
}

/* 通用样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--ukraine-blue);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background-color: var(--ukraine-blue);
    margin: 1rem auto;
    border-radius: 2px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background-color: var(--ukraine-blue);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background-color: var(--ukraine-yellow);
    color: var(--ukraine-blue);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background-color: var(--ukraine-yellow-dark);
    transform: translateY(-2px);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--ukraine-blue);
    backdrop-filter: blur(15px);
    z-index: 1000;
    border-bottom: 3px solid var(--ukraine-yellow);
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--white);
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background-color: var(--ukraine-yellow);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--ukraine-blue);
    margin: 3px 0;
    transition: var(--transition);
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-color: var(--ukraine-blue);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 91, 187, 0.1) 0%, transparent 50%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    margin-bottom: 1.5rem;
}

.title-main {
    display: block;
    font-size: 4rem;
    font-weight: 800;
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.title-sub {
    display: block;
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--ukraine-yellow);
    margin-top: 0.5rem;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--white);
    margin-bottom: 2rem;
    line-height: 1.7;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.hero-badges {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 终端窗口 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.terminal-window {
    background: var(--gray-900);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 500px;
}

.terminal-header {
    background: var(--gray-800);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.terminal-buttons {
    display: flex;
    gap: 0.5rem;
}

.terminal-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.btn-close {
    background: #ff5f56;
}

.btn-minimize {
    background: #ffbd2e;
}

.btn-maximize {
    background: #27ca3f;
}

.terminal-title {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.terminal-body {
    padding: 1.5rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

.terminal-line {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.prompt {
    color: var(--ukraine-yellow);
    font-weight: bold;
}

.command {
    color: var(--white);
}

.output {
    color: #4ade80;
}

.typing {
    position: relative;
}

.typing::after {
    content: '|';
    animation: blink 1s infinite;
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

/* 快速开始 */
.quick-start {
    padding: 5rem 0;
    background-color: var(--ukraine-yellow);
}

.quick-start-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.step-number {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: var(--ukraine-blue);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: var(--ukraine-blue);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.code-block {
    position: relative;
    background: var(--gray-900);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1rem 0;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    color: var(--white);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--ukraine-blue);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: var(--ukraine-blue-dark);
}

/* 功能特性 */
.features {
    padding: 5rem 0;
    background-color: var(--ukraine-blue);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 3px solid var(--ukraine-yellow);
}

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

.feature-icon {
    background-color: var(--ukraine-blue);
    width: 4rem;
    height: 4rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.feature-card h3 {
    color: var(--ukraine-blue);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.5rem;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--ukraine-yellow);
    font-weight: bold;
}

/* 使用场景 */
.usage-scenarios {
    padding: 5rem 0;
    background-color: var(--ukraine-yellow);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.scenario-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--ukraine-blue);
    border-right: 4px solid var(--ukraine-yellow);
}

.scenario-card h3 {
    color: var(--ukraine-blue);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.scenario-examples {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.example {
    background: var(--gray-900);
    color: var(--white);
    padding: 1rem;
    border-radius: var(--border-radius-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    border-left: 3px solid var(--ukraine-yellow);
}

/* 文档 */
.documentation {
    padding: 5rem 0;
    background-color: var(--ukraine-blue);
}

.docs-section h3 {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.docs-section h4 {
    color: var(--ukraine-yellow);
    font-size: 1.25rem;
    margin: 2rem 0 1rem 0;
}

.table-container {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.options-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 3px solid var(--ukraine-yellow);
}

.options-table th {
    background-color: var(--ukraine-blue);
    color: var(--white);
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.options-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
    vertical-align: top;
}

.options-table tr:hover {
    background: var(--gray-50);
}

.options-table code {
    background: var(--gray-100);
    color: var(--ukraine-blue);
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

.note {
    background: var(--ukraine-yellow-light);
    border: 1px solid var(--ukraine-yellow);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin: 1rem 0;
    color: var(--ukraine-blue-dark);
}

/* 隐私与安全 */
.privacy-security {
    padding: 5rem 0;
    background-color: var(--ukraine-yellow);
}

.privacy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.privacy-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 3px solid var(--ukraine-blue);
}

.privacy-card h3 {
    color: var(--ukraine-blue);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.privacy-card ul {
    list-style: none;
}

.privacy-card li {
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.5rem;
}

.privacy-card li::before {
    content: '🔒';
    position: absolute;
    left: 0;
}

/* 关于我们 */
.about {
    padding: 5rem 0;
    background-color: var(--ukraine-blue);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    color: var(--ukraine-yellow);
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.about-text p {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    color: var(--white);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--ukraine-yellow);
    display: block;
}

.stat-label {
    color: var(--white);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.about-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--border-radius-lg);
}

/* 页脚 */
.footer {
    background-color: var(--ukraine-blue);
    color: var(--white);
    padding: 3rem 0 1rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background-color: var(--ukraine-yellow);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.link-group h4 {
    color: var(--ukraine-yellow);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 0.5rem;
}

.link-group a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition);
}

.link-group a:hover {
    color: var(--ukraine-yellow);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 2rem;
    text-align: center;
    color: var(--gray-400);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.footer-bottom a {
    color: var(--ukraine-yellow);
    text-decoration: none;
}

/* 支持乌克兰声明 */
.ukraine-support {
    background-color: var(--ukraine-yellow);
    padding: 3rem 0;
    margin: 2rem 0;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    gap: 2rem;
    border: 3px solid var(--ukraine-blue);
}

.ukraine-flag {
    width: 80px;
    height: 60px;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.ukraine-flag-blue {
    width: 100%;
    height: 50%;
    background-color: var(--ukraine-blue);
}

.ukraine-flag-yellow {
    width: 100%;
    height: 50%;
    background-color: var(--ukraine-yellow);
}

.ukraine-statement {
    flex: 1;
    color: var(--ukraine-blue);
}

.ukraine-statement h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--ukraine-blue);
}

.ukraine-statement p {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    color: var(--ukraine-blue);
}

.ukraine-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.ukraine-link {
    background-color: var(--ukraine-blue);
    color: var(--white);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid var(--ukraine-blue);
}

.ukraine-link:hover {
    background-color: var(--white);
    color: var(--ukraine-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--ukraine-blue);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        border-top: 4px solid var(--ukraine-yellow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .title-main {
        font-size: 3rem;
    }

    .quick-start-content {
        grid-template-columns: 1fr;
    }

    .step {
        flex-direction: column;
        text-align: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .scenarios-grid {
        grid-template-columns: 1fr;
    }

    .privacy-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .container {
        padding: 0 1rem;
    }

    .ukraine-support {
        flex-direction: column;
        text-align: center;
        padding: 2rem 1rem;
    }

    .ukraine-actions {
        flex-direction: column;
        align-items: center;
    }

    .ukraine-link {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .title-main {
        font-size: 2.5rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .scenarios-grid {
        grid-template-columns: 1fr;
    }

    .scenario-card {
        padding: 1.5rem;
    }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background-color: var(--ukraine-blue);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--ukraine-blue-dark);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-300);
    border-radius: 50%;
    border-top-color: var(--ukraine-blue);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}