/* =============================================================================
   yaernuo-erp 公开官网样式
   纯CSS，零依赖，响应式，深蓝灰色专业企业风格
   ============================================================================= */

/* ── CSS 变量 ── */
:root {
    --color-primary: #1e3a5f;
    --color-primary-light: #2d5a8e;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-bg: #ffffff;
    --color-bg-alt: #f4f6f9;
    --color-bg-dark: #0f1f33;
    --color-text: #1a1a2e;
    --color-text-secondary: #4a5568;
    --color-text-light: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-success: #16a34a;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --max-width: 1200px;
    --nav-height: 64px;
    --radius: 8px;
}

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

html { font-size: 16px; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

/* ── 链接 ── */
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 2px; }

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

/* ── 导航 ── */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    height: var(--nav-height);
}
.nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.nav-brand { font-size: 1.25rem; font-weight: 700; color: var(--color-primary); white-space: nowrap; }
.nav-brand:hover { text-decoration: none; color: var(--color-primary-light); }
.nav-links { display: flex; list-style: none; gap: 4px; }
.nav-links a {
    display: block; padding: 8px 16px; border-radius: var(--radius);
    color: var(--color-text-secondary); font-size: 0.9375rem; font-weight: 500;
    transition: background 0.15s, color 0.15s;
}
.nav-links a:hover, .nav-links a.active {
    background: var(--color-bg-alt); color: var(--color-primary); text-decoration: none;
}

/* 移动端导航切换 */
.nav-toggle {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
.nav-toggle-label {
    display: none; cursor: pointer; padding: 8px;
    background: none; border: none; width: 40px; height: 40px; align-items: center; justify-content: center;
}
.nav-toggle-icon, .nav-toggle-icon::before, .nav-toggle-icon::after {
    display: block; width: 22px; height: 2px; background: var(--color-primary); border-radius: 1px;
    transition: transform 0.2s;
}
.nav-toggle-icon { position: relative; }
.nav-toggle-icon::before, .nav-toggle-icon::after { content: ''; position: absolute; left: 0; }
.nav-toggle-icon::before { top: -7px; }
.nav-toggle-icon::after { top: 7px; }
.nav-toggle:checked ~ nav .nav-links { display: flex; }
.nav-toggle:checked ~ .nav-toggle-label .nav-toggle-icon { background: transparent; }
.nav-toggle:checked ~ .nav-toggle-label .nav-toggle-icon::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle:checked ~ .nav-toggle-label .nav-toggle-icon::after { transform: translateY(-7px) rotate(-45deg); }
.nav-toggle:focus-visible + .nav-toggle-label {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

/* ── 按钮 ── */
.btn { display: inline-block; padding: 12px 28px; border-radius: var(--radius); font-size: 1rem; font-weight: 600; text-align: center; cursor: pointer; transition: all 0.15s; border: none; }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-hover); text-decoration: none; color: #fff; }
.btn-outline { background: transparent; color: var(--color-accent); border: 2px solid var(--color-accent); }
.btn-outline:hover { background: var(--color-accent); color: #fff; text-decoration: none; }
.btn-group { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Hero ── */
.hero { padding: 80px 0 64px; text-align: center; }
.hero h1 { font-size: 2.75rem; font-weight: 800; color: var(--color-primary); margin-bottom: 16px; letter-spacing: -0.02em; }
.hero .subtitle { font-size: 1.25rem; color: var(--color-text-secondary); margin-bottom: 12px; }
.hero .tagline { font-size: 1.05rem; color: var(--color-text-secondary); margin-bottom: 36px; max-width: 640px; margin-left: auto; margin-right: auto; }
.hero .btn-group { justify-content: center; }

/* ── 区域标题 ── */
.section { padding: 72px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-title { font-size: 1.75rem; font-weight: 700; color: var(--color-primary); text-align: center; margin-bottom: 12px; }
.section-desc { color: var(--color-text-secondary); text-align: center; max-width: 640px; margin: 0 auto 40px; font-size: 1.05rem; }

/* ── 能力卡片 ── */
.capability-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; justify-content: center; }
.capability-tag {
    display: flex; align-items: center; justify-content: center;
    padding: 14px 16px; border-radius: var(--radius); font-size: 0.95rem; font-weight: 600;
    background: var(--color-bg-alt); color: var(--color-primary); border: 1px solid var(--color-border);
    text-align: center; transition: border-color 0.15s;
}
.capability-tag:hover { border-color: var(--color-accent); }

/* ── 场景卡片 ── */
.scenario-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.scenario-card { padding: 28px; border-radius: var(--radius); background: var(--color-bg); border: 1px solid var(--color-border); }
.scenario-card h3 { font-size: 1.1rem; color: var(--color-primary); margin-bottom: 8px; }
.scenario-card p { color: var(--color-text-secondary); font-size: 0.9375rem; }
.badge-planning {
    display: inline-block; padding: 2px 10px; border-radius: 12px;
    background: #fef3c7; color: #92400e; font-size: 0.8rem; font-weight: 600;
    margin-top: 8px;
}

/* ── 功能模块 ── */
.feature-list { max-width: 900px; margin: 0 auto; }
.feature-block { margin-bottom: 40px; padding: 28px; border-radius: var(--radius); background: var(--color-bg); border: 1px solid var(--color-border); }
.feature-block h3 { font-size: 1.15rem; color: var(--color-primary); margin-bottom: 12px; }
.feature-block p { color: var(--color-text-secondary); font-size: 0.9375rem; }
.feature-block ul { list-style: none; margin-top: 8px; }
.feature-block ul li { padding: 4px 0; color: var(--color-text-secondary); font-size: 0.9375rem; }
.feature-block ul li::before { content: '· '; color: var(--color-accent); font-weight: 700; }

/* ── 规划方向区块 ── */
.planned-section { max-width: 900px; margin: 40px auto 0; padding: 24px 28px; border-radius: var(--radius); background: #f8fafc; border: 1px dashed var(--color-border); }
.planned-section h3 { font-size: 1rem; color: var(--color-text-muted); margin-bottom: 8px; }
.planned-section p { color: var(--color-text-muted); font-size: 0.9375rem; }
.planned-section ul { list-style: none; margin-top: 8px; color: var(--color-text-muted); font-size: 0.9375rem; }
.planned-section ul li { padding: 3px 0; }
.planned-section ul li::before { content: '→ '; }

/* ── 页面通用内容 ── */
.page-content { max-width: 900px; margin: 0 auto; padding: 48px 24px 72px; }
.page-content h1 { font-size: 2rem; font-weight: 800; color: var(--color-primary); margin-bottom: 20px; }
.page-content h2 { font-size: 1.35rem; font-weight: 700; color: var(--color-primary); margin: 36px 0 12px; }
.page-content h3 { font-size: 1.1rem; font-weight: 600; color: var(--color-text); margin: 24px 0 8px; }
.page-content p { margin-bottom: 14px; color: var(--color-text-secondary); line-height: 1.75; }
.page-content ul, .page-content ol { margin: 0 0 14px 24px; color: var(--color-text-secondary); line-height: 1.75; }
.page-content li { margin-bottom: 4px; }
.page-content .placeholder { color: var(--color-text-muted); font-style: italic; }
.page-content strong { color: var(--color-text); }

/* ── 法律页面 ── */
.legal-content { max-width: 800px; margin: 0 auto; padding: 48px 24px 72px; }
.legal-content h1 { font-size: 1.75rem; font-weight: 800; color: var(--color-primary); margin-bottom: 8px; }
.legal-content .last-updated { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 32px; }
.legal-content h2 { font-size: 1.15rem; font-weight: 700; color: var(--color-primary); margin: 32px 0 10px; }
.legal-content p, .legal-content li { color: var(--color-text-secondary); line-height: 1.8; margin-bottom: 10px; font-size: 0.9375rem; }
.legal-content ul, .legal-content ol { margin: 0 0 10px 24px; }

/* ── OAuth 说明页 ── */
.oauth-content { max-width: 720px; margin: 0 auto; padding: 48px 24px 72px; }
.oauth-content h1 { font-size: 1.75rem; font-weight: 800; color: var(--color-primary); margin-bottom: 20px; }
.oauth-content h2 { font-size: 1.15rem; font-weight: 700; color: var(--color-primary); margin: 28px 0 10px; }
.oauth-content p, .oauth-content li { color: var(--color-text-secondary); line-height: 1.8; margin-bottom: 10px; }
.oauth-content .notice { padding: 16px 20px; border-radius: var(--radius); background: #eff6ff; border-left: 4px solid var(--color-accent); margin: 16px 0; font-size: 0.9375rem; color: var(--color-primary); }

/* ── 404 ── */
.not-found { text-align: center; padding: 100px 24px; }
.not-found h1 { font-size: 3rem; font-weight: 800; color: var(--color-primary); margin-bottom: 12px; }
.not-found p { color: var(--color-text-secondary); margin-bottom: 28px; font-size: 1.1rem; }

/* ── 占位符 ── */
.placeholder { color: var(--color-text-muted); }

/* ── 页脚 ── */
.site-footer { background: var(--color-bg-dark); color: var(--color-text-muted); padding: 40px 0 24px; font-size: 0.875rem; }
.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.footer-links a { color: var(--color-text-light); opacity: 0.8; }
.footer-links a:hover { opacity: 1; text-decoration: none; }
.footer-info { line-height: 1.8; }
.footer-info .beian { color: var(--color-text-muted); }
.footer-info .beian a { color: var(--color-text-light); opacity: 0.9; }
.footer-info .beian a:hover { opacity: 1; }

/* ── 移动端 ── */
@media (max-width: 768px) {
    .nav-toggle-label { display: flex; }
    .nav-links {
        display: none; flex-direction: column; position: absolute;
        top: var(--nav-height); left: 0; right: 0;
        background: #fff; border-bottom: 1px solid var(--color-border);
        padding: 8px 24px 16px; box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    }
    .nav-links a { padding: 12px 16px; }
    .nav-toggle:checked ~ nav .nav-links { display: flex; }

    .hero { padding: 48px 0 40px; }
    .hero h1 { font-size: 1.75rem; }
    .hero .subtitle { font-size: 1.05rem; }
    .hero .tagline { font-size: 0.95rem; }

    .capability-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .capability-tag { font-size: 0.85rem; padding: 10px 12px; }

    .section { padding: 40px 0; }
    .section-title { font-size: 1.35rem; }

    .page-content { padding: 32px 24px 48px; }
    .page-content h1 { font-size: 1.5rem; }
    .legal-content { padding: 32px 24px 48px; }
    .legal-content h1 { font-size: 1.35rem; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.5rem; }
    .capability-grid { grid-template-columns: 1fr 1fr; }
    .btn-group { flex-direction: column; align-items: center; }
}