/* ===== 基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #ffffff;
    color: #111827;
    line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

:root {
    --bg: #ffffff;
    --panel: #ffffff;
    --panel-strong: #f8fafc;
    --stroke: #e5e7eb;
    --accent: #229ED9;
    --accent-2: #4FB3E8;
    --text: #111827;
    --muted: #6b7280;
    --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
    --radius: 14px;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.noscript-tip {
    background: #f3f4f6; color: #111827; text-align: center; padding: 10px 16px;
    font-size: 0.9rem; border-bottom: 1px solid var(--stroke);
}
.noscript-tip a { color: var(--accent); margin-left: 6px; }

/* ===== 导航 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid transparent;
    transition: all 0.3s;
}
.navbar.scrolled { border-bottom-color: var(--stroke); box-shadow: 0 8px 24px rgba(15,23,42,0.08); }
.nav-flex { height: 70px; display: flex; align-items: center; justify-content: space-between; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.logo-mark {
    width: 34px; height: 34px; border-radius: 10px; display: inline-flex; align-items: center; justify-content: center;
    background: var(--accent); color: #fff;
}
.nav-links { display: flex; align-items: center; gap: 10px; }
.nav-links a { padding: 8px 14px; border-radius: 999px; font-size: 0.92rem; color: var(--muted); transition: all 0.2s; }
.nav-links a:hover { color: #111827; background: #f3f4f6; }
.btn-nav {
    background: var(--accent);
    color: #fff !important; padding: 8px 18px !important; font-weight: 600;
}
.hamburger { display: none; font-size: 1.4rem; color: #111827; cursor: pointer; }
.mobile-menu {
    display: none; flex-direction: column; gap: 6px; padding: 14px 24px 18px;
    background: #ffffff; border-top: 1px solid var(--stroke);
}
.mobile-menu.active { display: flex; }
.mobile-menu a { padding: 10px 12px; border-radius: 10px; color: var(--muted); }
.mobile-menu a:hover { color: #111827; background: #f3f4f6; }

/* ===== 按钮 ===== */
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--accent);
    color: #fff; padding: 14px 28px; border-radius: 999px; font-weight: 600; box-shadow: var(--shadow);
    transition: transform 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
    display: inline-flex; align-items: center; gap: 8px;
    border: 1px solid var(--stroke); color: #111827; padding: 14px 26px; border-radius: 999px;
    background: #ffffff;
}
.btn-large { padding: 16px 34px; }

/* ===== Hero ===== */
.hero { padding: 130px 0 80px; background: #f8fafc; }
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.9fr; gap: 60px; align-items: center; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 999px;
    background: #e6f4fb; color: #0f5f86; border: 1px solid #d4ecf7;
    font-size: 0.85rem; margin-bottom: 18px;
}
.hero h1 { font-size: 3rem; line-height: 1.2; margin-bottom: 20px; }
.accent-text { color: var(--accent); }
.hero p { color: var(--muted); margin-bottom: 28px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-metrics { display: flex; gap: 28px; color: var(--muted); }
.hero-metrics strong { display: block; font-size: 1.4rem; color: #111827; }
.hero-visual { display: flex; flex-direction: column; gap: 20px; }
.glass-card {
    background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius);
    padding: 20px 22px; box-shadow: var(--shadow);
}
.glass-card.primary { min-height: 240px; }
.card-top { display: flex; gap: 6px; margin-bottom: 12px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #e5e7eb; }
.card-title { font-weight: 600; margin-bottom: 12px; color: #111827; }
.chat-bubble { padding: 10px 14px; border-radius: 14px; margin-bottom: 10px; font-size: 0.85rem; }
.chat-bubble.left { background: #f3f4f6; }
.chat-bubble.right { background: #e6f4fb; margin-left: auto; }
.signal-row { display: flex; gap: 6px; margin: 10px 0; }
.signal { width: 14px; height: 10px; background: var(--accent); border-radius: 4px; }
.muted { color: var(--muted); font-size: 0.85rem; }

/* ===== 信息条 ===== */
.glow-strip { background: #ffffff; padding: 26px 0; border-top: 1px solid var(--stroke); border-bottom: 1px solid var(--stroke); }
.strip-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; text-align: center; }
.strip-item { padding: 12px; border-radius: 999px; background: #f8fafc; color: var(--muted); }
.strip-item i { color: var(--accent); margin-right: 6px; }

/* ===== 通用标题 ===== */
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 2.1rem; margin-bottom: 12px; }
.section-head p { color: var(--muted); }

/* ===== 功能卡片 ===== */
.features { padding: 80px 0; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); padding: 26px;
    transition: transform 0.2s; min-height: 180px; box-shadow: 0 6px 18px rgba(15,23,42,0.04);
}
.feature-card:hover { transform: translateY(-4px); }
.feature-card i { font-size: 1.5rem; color: var(--accent); margin-bottom: 16px; }
.feature-card h3 { margin-bottom: 10px; }
.feature-card p { color: var(--muted); font-size: 0.92rem; }

/* ===== 隐私 ===== */
.privacy { padding: 80px 0; background: #f9fafb; }
.privacy-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }
.privacy-text ul { margin: 20px 0 30px; display: grid; gap: 12px; }
.privacy-text li { display: flex; gap: 10px; align-items: flex-start; color: var(--muted); }
.privacy-text li i { color: #10b981; margin-top: 4px; }
.privacy-card { background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); padding: 30px; text-align: center; box-shadow: var(--shadow); }
.privacy-card .score { font-size: 3rem; font-weight: 700; margin: 10px 0; }
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.badge-row span { background: #e6f4fb; padding: 6px 12px; border-radius: 999px; font-size: 0.8rem; color: #0f5f86; }

/* ===== 工作流 ===== */
.workflow { padding: 80px 0; }
.workflow-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step-card { background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); padding: 24px; }
.step-no { font-size: 2rem; font-weight: 700; color: #9ca3af; }

/* ===== 评价 ===== */
.testimonials { padding: 80px 0; background: #ffffff; }
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); padding: 24px; box-shadow: 0 6px 18px rgba(15,23,42,0.04); }
.stars { color: #f59e0b; margin-bottom: 12px; }
.author { margin-top: 14px; color: var(--muted); }

/* ===== FAQ ===== */
.faq { padding: 80px 0; background: #f9fafb; }
.faq-list { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item { background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); overflow: hidden; }
.faq-q { padding: 18px 22px; display: flex; justify-content: space-between; cursor: pointer; }
.faq-q i { transition: transform 0.2s; color: var(--muted); }
.faq-item.open .faq-q i { transform: rotate(180deg); color: #111827; }
.faq-a { display: none; padding: 0 22px 18px; color: var(--muted); }
.faq-item.open .faq-a { display: block; }

/* ===== CTA ===== */
.cta { padding: 80px 0; text-align: center; background: #f8fafc; border-top: 1px solid var(--stroke); }
.cta p { color: var(--muted); margin: 16px 0 30px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Share ===== */
.share-float { position: fixed; bottom: 24px; right: 24px; display: flex; flex-direction: column; gap: 10px; }
.share-toggle {
    width: 48px; height: 48px; border-radius: 50%; background: var(--accent);
    display: flex; align-items: center; justify-content: center; color: #fff; box-shadow: var(--shadow); cursor: pointer;
}
.share-btns { display: none; flex-direction: column; gap: 8px; }
.share-btns.active { display: flex; }
.share-btn { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; color: #fff; }
.share-twitter { background: #1DA1F2; }
.share-facebook { background: #1877F2; }
.share-weibo { background: #E6162D; }
.share-tg { background: #2AABEE; }

/* ===== Footer ===== */
.footer { background: #ffffff; border-top: 1px solid var(--stroke); padding: 70px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 30px; }
.footer p { color: var(--muted); margin-top: 12px; }
.footer h4 { margin-bottom: 12px; }
.footer ul { display: grid; gap: 8px; color: var(--muted); }
.footer ul a:hover { color: #111827; }
.footer-logo { display: inline-flex; align-items: center; gap: 10px; }
.social-links { display: flex; gap: 10px; margin-top: 14px; }
.social-links a { width: 36px; height: 36px; border-radius: 50%; background: #f3f4f6; display: grid; place-items: center; color: #111827; }
.footer-bottom { text-align: center; margin-top: 40px; color: var(--muted); font-size: 0.85rem; }

/* ===== Page Hero ===== */
.page-hero { padding: 120px 0 70px; text-align: center; background: #f8fafc; }
.hero-center p { color: var(--muted); margin: 16px auto 26px; max-width: 680px; }

/* ===== Features Detail ===== */
.feature-detail { padding: 80px 0; }
.detail-block { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 30px; align-items: center; margin-bottom: 60px; }
.detail-block.reverse { direction: rtl; }
.detail-block.reverse > * { direction: ltr; }
.tag { display: inline-flex; gap: 8px; align-items: center; padding: 6px 14px; border-radius: 999px; background: #e6f4fb; color: #0f5f86; margin-bottom: 14px; }
.detail-card { background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); padding: 26px; text-align: center; box-shadow: 0 6px 18px rgba(15,23,42,0.04); }
.detail-card .score { font-size: 2.6rem; font-weight: 700; margin: 10px 0; }

/* ===== Download ===== */
.download { padding: 80px 0; }
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.download-card { background: #ffffff; border: 1px solid var(--stroke); border-radius: var(--radius); padding: 24px; }
.download-card h3 { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.download-card p { color: var(--muted); margin-bottom: 14px; }
.download-card ul { display: grid; gap: 8px; color: var(--muted); margin-bottom: 18px; }
.download-card.featured { border-color: #cfe9f6; box-shadow: 0 8px 20px rgba(15,23,42,0.06); }
.btn-download {
    display: inline-flex; justify-content: center; align-items: center; padding: 12px 18px; border-radius: 999px;
    background: var(--accent); color: #fff; font-weight: 600; width: 100%;
}
.btn-download.ghost { background: #ffffff; border: 1px solid var(--stroke); color: #111827; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; }
    .strip-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-grid, .testimonial-grid, .workflow-steps, .download-grid { grid-template-columns: repeat(2, 1fr); }
    .privacy-grid, .detail-block { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
    .nav-links { display: none; }
    .hamburger { display: block; }
    .strip-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid, .testimonial-grid, .workflow-steps, .download-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.2rem; }
}