/* ============================================
   简云 (JianYun) 官网 - 亮色科技风
   ============================================ */

:root {
    --bg-primary: #f8faff;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f6ff;
    --bg-accent-light: #e8f0fe;
    --border-color: #e2e8f0;
    --border-hover: #b8c9e0;
    --text-primary: #1a2332;
    --text-secondary: #4a5a72;
    --text-muted: #8899b0;
    --accent-blue: #0066ff;
    --accent-cyan: #0099ff;
    --accent-purple: #6c63ff;
    --gradient-main: linear-gradient(135deg, #0066ff, #6c63ff);
    --gradient-cyan: linear-gradient(135deg, #0099ff, #0066ff);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --nav-height: 64px;
    --max-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.08);
    --shadow-glow: 0 4px 24px rgba(0, 102, 255, 0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-blue); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--accent-purple); }
ul { list-style: none; }

/* --- 粒子背景 --- */
#particleCanvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    opacity: 0.5;
}

/* --- 容器 --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- 导航 --- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-height);
    z-index: 100;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}
.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}
.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.5px;
}
.logo-icon { font-size: 1.5rem; }
.logo-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-links { display: flex; gap: 32px; }
.nav-link {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    transition: color 0.3s;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 0;
    width: 0; height: 2px;
    background: var(--gradient-main);
    transition: width 0.3s;
    border-radius: 2px;
}
.nav-link:hover { color: var(--accent-blue); }
.nav-link:hover::after { width: 100%; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 140px 24px 100px;
    overflow: hidden;
    background: linear-gradient(135deg, #f0f6ff 0%, #ffffff 50%, #f5f0ff 100%);
}
.hero-grid-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(0, 102, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.06) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at 50% 40%, black 25%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 25%, transparent 70%);
}
.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    z-index: 2;
}
.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-blue);
    background: rgba(0, 102, 255, 0.06);
    margin-bottom: 24px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.hero-title {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
    color: var(--text-primary);
}
.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.accent-text { color: var(--accent-blue); }
.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    font-family: var(--font-sans);
}
.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
    box-shadow: 0 8px 40px rgba(0, 102, 255, 0.3);
    transform: translateY(-2px);
    color: #fff;
}
.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
}
.btn-outline:hover {
    border-color: var(--accent-blue);
    background: rgba(0, 102, 255, 0.04);
    transform: translateY(-2px);
    color: var(--accent-blue);
}
.btn-icon { font-size: 1.1rem; }
.btn-arrow { transition: transform 0.3s; display: inline-block; }
.btn-outline:hover .btn-arrow { transform: translateX(4px); }

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 2.2rem;
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    line-height: 1.2;
}
.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

/* --- Section 通用 --- */
.section {
    position: relative;
    padding: 100px 0;
    z-index: 1;
}
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--accent-blue);
    margin-bottom: 12px;
    text-transform: uppercase;
}
.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}
.section-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 500px;
    margin: 0 auto;
}

/* --- 功能卡片 --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.6s ease forwards;
    animation-delay: calc(var(--i) * 0.08s);
    box-shadow: var(--shadow-sm);
}
.feature-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-card-hover);
}
.feature-icon { font-size: 2rem; margin-bottom: 16px; }
.feature-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}
.feature-desc {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.65;
}

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

/* --- 技术栈 --- */
.tech {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 16px;
}
.tech-card-inner {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}
.tech-card-inner:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}
.tech-name {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.tech-version {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* --- 下载区域 --- */
.download-card {
    max-width: 640px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
}
.download-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}
.download-info {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}
.download-icon { font-size: 2.5rem; }
.download-info h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}
.download-meta { color: var(--text-muted); font-size: 0.85rem; margin-top: 2px; }
.changelog {
    background: var(--bg-accent-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px 24px;
    margin-bottom: 24px;
}
.changelog h4 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-blue);
    margin-bottom: 12px;
}
.changelog ul { display: flex; flex-direction: column; gap: 8px; }
.changelog li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}
.changelog li::before {
    content: '';
    position: absolute;
    left: 0; top: 8px;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent-blue);
    opacity: 0.6;
}
.download-actions { text-align: center; }
.btn-download {
    font-size: 1.1rem;
    padding: 16px 40px;
}
.download-note { margin-top: 12px; font-size: 0.8rem; color: var(--text-muted); }

/* --- 关于 --- */
.about-intro {
    text-align: center;
    max-width: 680px;
    margin: -32px auto 48px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

.doc-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}
.doc-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px 20px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}
.doc-card:hover {
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    color: inherit;
}
.doc-icon {
    font-size: 1.8rem;
    margin-bottom: 12px;
}
.doc-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.doc-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0;
}

.about-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
    padding: 24px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}
.about-info {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}
.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
}
.info-icon {
    font-size: 1.3rem;
}
.info-item div {
    display: flex;
    flex-direction: column;
}
.info-item strong {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
}
.info-item span {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.about-actions {
    display: flex;
    gap: 10px;
}
.about-actions .btn {
    padding: 8px 20px;
    font-size: 0.85rem;
}

/* --- 页脚 --- */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 48px 0 24px;
    background: var(--bg-secondary);
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.footer-brand .logo-icon { font-size: 1.5rem; }
.footer-brand .logo-text { font-size: 1.25rem; font-weight: 800; }
.footer-brand p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0;
}
.footer-links h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 14px;
    font-weight: 600;
}
.footer-links a {
    display: block;
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 8px;
    transition: color 0.3s;
}
.footer-links a:hover { color: var(--accent-blue); }
.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.78rem;
}
/* --- 响应式 --- */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: var(--nav-height); left: 0; right: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px 32px;
        gap: 20px;
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s ease;
        border-bottom: 1px solid var(--border-color);
        pointer-events: none;
    }
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    .nav-toggle { display: flex; }
    .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    .hero-stats { gap: 24px; }
    .stat-number { font-size: 1.6rem; }

    .doc-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .download-card { padding: 28px 20px; }
    .features-grid { grid-template-columns: 1fr; }
    .hide-mobile { display: none; }
    .about-bottom { flex-direction: column; align-items: stretch; padding: 20px; }
    .about-info { justify-content: center; }
    .info-item { flex: 1; min-width: 140px; }
    .about-actions { justify-content: center; }
}

@media (max-width: 480px) {
    .doc-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; gap: 20px; }
    .about-bottom { padding: 16px; }
    .about-info { flex-direction: column; }
    .hero { padding: 100px 16px 60px; }
    .section { padding: 60px 0; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
}