/* 微订剪辑 - Synthesia 风格（白底 + 紫蓝渐变 + 大留白 + 演示窗口） */
@font-face {
  font-family: 'SmileySans';
  src: url('/fonts/SmileySans-Oblique.otf.woff2') format('woff2');
  font-display: swap;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #6E3AFF;          /* Synthesia 式品牌紫 */
  --primary-2: #A855F7;
  --grad: linear-gradient(120deg, #6E3AFF, #A855F7);
  --bg: #FFFFFF;
  --bg-alt: #F8F7FF;
  --text: #12101F;
  --muted: #6B7280;
  --border: #EDEAF8;
  --radius: 16px;
  --shadow: 0 2px 10px rgba(60, 30, 130, .06);
  --shadow-lg: 0 16px 40px rgba(60, 30, 130, .12);
}
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif; background: var(--bg); color: var(--text); line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); font-size: 13px; }
.center { text-align: center; }

/* ===== 顶部导航（Synthesia 式：极简） ===== */
.site-header { background: rgba(255,255,255,.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 26px; }
.logo-text { font-family: 'SmileySans'; font-size: 22px; color: var(--text); letter-spacing: 1px; }
.logo-text em { font-style: normal; color: var(--primary); }
.site-header nav { display: flex; gap: 8px; }
.site-header nav a { color: #4A4A5A; font-size: 14.5px; padding: 8px 14px; border-radius: 8px; transition: all .2s; }
.site-header nav a:hover { background: #F3F0FF; color: var(--primary); }

/* ===== 按钮（Synthesia 式：实心渐变 + 白色描边） ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 12px 26px; border-radius: 10px; font-size: 15px; font-weight: 600; border: none; cursor: pointer; transition: all .22s; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 4px 16px rgba(110, 58, 255, .30); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(110, 58, 255, .40); }
.btn-white { background: #fff; color: var(--primary); border: 1.5px solid #E4DDFF; }
.btn-white:hover { background: #F8F6FF; transform: translateY(-2px); }
.btn-lg { padding: 15px 36px; font-size: 16.5px; border-radius: 12px; }
.btn-sm { padding: 9px 18px; font-size: 13.5px; }

/* ===== 信任条 ===== */
.trust-bar { background: #F3F0FF; border-bottom: 1px solid var(--border); }
.trust-inner { display: flex; justify-content: center; gap: 36px; padding: 10px 0; flex-wrap: wrap; }
.trust-item { font-size: 13px; color: #5A4A9A; font-weight: 500; }

/* ===== Hero（Synthesia 式：大标题居中 + 双CTA + 演示窗口） ===== */
.hero { padding: 30px 0 18px; text-align: center; background: radial-gradient(ellipse 80% 60% at 50% 0%, #F5F0FF 0%, #FFFFFF 60%); }
.hero-badge { display: inline-block; background: #F0EBFF; color: var(--primary); border: 1px solid #E4DDFF; border-radius: 30px; padding: 6px 18px; font-size: 12.5px; font-weight: 600; margin-bottom: 10px; }
.hero-title { font-family: 'SmileySans'; font-size: 34px; line-height: 1.3; margin-bottom: 10px; letter-spacing: 1px; }
.hero-title .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: 14.5px; color: #5A5A6E; margin: 0 auto 14px; max-width: 600px; }
.hero-sub b { color: var(--text); }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 10px; }
.hero-trust { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; font-size: 12px; }
.hero-trust span { font-size: 13.5px; color: var(--muted); }

/* 演示窗口（Synthesia 式：产品界面卡片） */
.hero-demo { max-width: 780px; margin: 0 auto; }
.demo-window { background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow-lg); overflow: hidden; text-align: left; }
.demo-bar { display: flex; gap: 7px; padding: 14px 18px; background: #FAF9FF; border-bottom: 1px solid var(--border); }
.demo-bar span { width: 11px; height: 11px; border-radius: 50%; background: #E4E0F5; }
.demo-bar span:first-child { background: #FF8FA3; }
.demo-bar span:nth-child(2) { background: #FFD166; }
.demo-bar span:nth-child(3) { background: #6BCB77; }
.demo-body { display: grid; grid-template-columns: 180px 1fr; min-height: 210px; }
.demo-left { border-right: 1px solid var(--border); padding: 20px 14px; display: flex; flex-direction: column; gap: 10px; }
.demo-step { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--muted); padding: 8px 10px; border-radius: 8px; }
.demo-step.active { background: #F3F0FF; color: var(--primary); font-weight: 600; }
.demo-step .n { background: var(--grad); color: #fff; border-radius: 50%; width: 22px; height: 22px; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; }
.demo-right { padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.demo-file { display: flex; align-items: center; gap: 12px; background: #FAF9FF; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.file-icon { font-size: 24px; }
.demo-file b { font-size: 13.5px; display: block; }
.demo-file p { font-size: 12px; color: var(--muted); }
.file-pct { margin-left: auto; color: var(--primary); font-weight: 700; font-size: 13px; }
.file-ok { margin-left: auto; color: #6BCB77; font-weight: 700; font-size: 16px; }
.demo-caption { margin-top: 14px; font-size: 13px; color: var(--muted); }

/* ===== 数据条 ===== */
.stats-band { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; display: flex; justify-content: space-around; flex-wrap: wrap; gap: 12px; margin: 16px 0 0; box-shadow: var(--shadow); }
.stat { text-align: center; }
.stat-num { font-family: 'SmileySans'; font-size: 28px; color: var(--primary); }
.stat-label { font-size: 12.5px; color: var(--muted); }

/* ===== 板块 ===== */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 26px; }
.section-title { font-family: 'SmileySans'; font-size: 26px; letter-spacing: .5px; }
.section-title.center { text-align: center; margin-bottom: 34px; }
.section-more { color: var(--primary); font-size: 14px; font-weight: 600; }

/* ===== 功能卡（Synthesia 式：大卡 + 图标渐变底） ===== */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 28px 24px; display: flex; flex-direction: column; gap: 12px; transition: all .25s; position: relative; overflow: hidden; }
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--grad); opacity: 0; transition: opacity .25s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { opacity: 1; }
.feature-icon { width: 54px; height: 54px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 27px; background: linear-gradient(135deg, #F0EBFF, #F8F4FF); }
.feature-card:nth-child(2n) .feature-icon { background: linear-gradient(135deg, #FFF3E8, #FFF9F2); }
.feature-card:nth-child(3n) .feature-icon { background: linear-gradient(135deg, #E8F9F0, #F2FBF6); }
.feature-title { font-weight: 700; font-size: 17px; }
.feature-desc { font-size: 13.5px; color: var(--muted); flex: 1; line-height: 1.6; }
.feature-cta { color: var(--primary); font-size: 14px; font-weight: 600; }
.feature-cta span { transition: transform .2s; display: inline-block; }
.feature-card:hover .feature-cta span { transform: translateX(5px); }

/* ===== 工具 chips（Synthesia 式：场景入口） ===== */
.tool-chips { display: flex; gap: 12px; flex-wrap: wrap; }
.tool-chip { background: #fff; border: 1px solid var(--border); border-radius: 30px; padding: 12px 22px; font-size: 14px; font-weight: 500; color: var(--text); transition: all .2s; }
.tool-chip:hover { border-color: var(--primary); color: var(--primary); background: #F8F6FF; transform: translateY(-2px); box-shadow: var(--shadow); }
.tool-chip-more { border-style: dashed; color: var(--muted); }

/* ===== 锚点滚动预留（避免被吸顶导航盖住） ===== */
#tools-free, #tools-ai, #tools-core { scroll-margin-top: 125px; }

/* ===== 锚点导航条 ===== */
.anchor-bar { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 62px; z-index: 90; }
.anchor-inner { display: flex; gap: 8px; padding: 10px 20px; flex-wrap: wrap; }
.anchor-link { font-size: 13.5px; color: #4A4A5A; padding: 6px 14px; border-radius: 20px; transition: all .2s; animation: anchorSeq 6s ease-in-out infinite; }
.anchor-link:nth-child(1) { animation-delay: 0s; }
.anchor-link:nth-child(2) { animation-delay: 1.5s; }
.anchor-link:nth-child(3) { animation-delay: 3s; }
.anchor-link:nth-child(4) { animation-delay: 4.5s; }
.anchor-link:hover { background: #F3F0FF; color: var(--primary); animation-play-state: paused; }
@keyframes anchorSeq {
  0%, 100% { background: transparent; color: #4A4A5A; transform: scale(1); }
  8% { background: var(--grad); color: #fff; transform: scale(1.06); box-shadow: 0 4px 12px rgba(110,58,255,.35); }
  15% { background: transparent; color: #4A4A5A; transform: scale(1); }
}

/* ===== 主推区（批量剪辑 C 位） ===== */
.hero-product { display: grid; grid-template-columns: 1fr 280px; gap: 22px; background: linear-gradient(135deg, #F8F6FF, #F0EBFF); border: 1px solid var(--border); border-radius: 22px; padding: 34px 30px; align-items: center; }
.hero-product-badge { display: inline-block; background: var(--grad); color: #fff; border-radius: 20px; padding: 4px 14px; font-size: 12px; font-weight: 600; margin-bottom: 14px; }
.hero-product-title { font-family: 'SmileySans'; font-size: 28px; margin-bottom: 12px; letter-spacing: .5px; }
.hero-product-title .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-product-desc { font-size: 14.5px; color: #5A5A6E; margin-bottom: 16px; max-width: 560px; }
.hero-product-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.tag-mini { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 4px 12px; font-size: 12.5px; color: #4A4A5A; }
.hero-product-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-product-side { display: flex; flex-direction: column; gap: 12px; }
.side-tool-card { display: flex; align-items: center; gap: 10px; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; transition: all .2s; }
.side-tool-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.side-tool-icon { font-size: 22px; }
.side-tool-card b { font-size: 13px; display: block; }
.side-tool-card p { font-size: 12px; color: var(--muted); }

/* ===== 免费工具紧凑列表（不抢主次） ===== */
#tools-free.section { padding: 26px 0 34px; }
#tools-free .section-head { margin-bottom: 14px; }
.free-tools { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 6px; }
.free-tool { display: flex; align-items: center; gap: 8px; background: #fff; border: 1.5px solid #D6CFFF; border-radius: 10px; padding: 8px 12px; font-size: 13.5px; color: var(--text); transition: all .2s; }
.free-tool:hover { border-color: var(--primary); color: var(--primary); background: #F8F6FF; transform: translateY(-1px); }
.free-tool.hot { border: 1.5px solid var(--primary); background: linear-gradient(135deg, #F6F3FF, #FBF8FF); position: relative; }
.free-tool.hot:hover { background: #F0EBFF; }
.hot-tag { margin-left: auto; font-size: 11px; background: var(--grad); color: #fff; border-radius: 10px; padding: 1px 8px; }

/* ===== 为什么选我们 ===== */
.why-section { padding: 14px 0 20px; }
.why-title { margin-bottom: 16px; }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.why-card { display: flex; align-items: flex-start; gap: 12px; text-align: left; padding: 10px 12px; }
.why-icon { font-size: 26px; margin-bottom: 0; flex-shrink: 0; }
.why-card h3 { font-size: 15px; margin-bottom: 4px; }
.why-card p { font-size: 12px; color: var(--muted); }

/* ===== CTA 横幅 ===== */
.cta-band { background: var(--grad); border-radius: 22px; text-align: center; padding: 54px 24px; color: #fff; position: relative; overflow: hidden; }
.cta-band::before { content: ''; position: absolute; width: 360px; height: 360px; border-radius: 50%; background: rgba(255,255,255,.10); top: -150px; right: -100px; }
.cta-band::after { content: ''; position: absolute; width: 260px; height: 260px; border-radius: 50%; background: rgba(255,255,255,.08); bottom: -120px; left: -80px; }
.cta-band h2 { font-family: 'SmileySans'; font-size: 32px; margin-bottom: 12px; letter-spacing: .5px; position: relative; z-index: 1; }
.cta-band p { opacity: .92; margin-bottom: 26px; font-size: 15px; position: relative; z-index: 1; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 1; }
.cta-band .btn-white { border: none; }

/* ===== FAQ ===== */
.faq { max-width: 760px; margin: 0 auto; }
.faq-item { padding: 18px 4px; border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }
.faq-item b { font-size: 15.5px; display: block; margin-bottom: 6px; }
.faq-item p { font-size: 14px; color: #5A5A6E; }

/* ===== 工具页（沿用但换紫色系） ===== */
.tool-hero { background: var(--grad); color: #fff; padding: 44px 0; margin-bottom: 26px; position: relative; overflow: hidden; }
.tool-hero::after { content: ''; position: absolute; width: 300px; height: 300px; border-radius: 50%; background: rgba(255,255,255,.10); top: -130px; right: -60px; }
.tool-hero-inner { display: flex; align-items: center; gap: 22px; position: relative; z-index: 1; }
.tool-hero-icon { font-size: 44px; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.28); border-radius: 18px; width: 88px; height: 88px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; box-shadow: 0 8px 24px rgba(0,0,0,.15); }
.tool-hero h1 { font-family: 'SmileySans'; font-size: 30px; margin-bottom: 6px; letter-spacing: .5px; }
.tool-hero-tagline { opacity: .93; font-size: 15.5px; }
.tool-main { display: grid; grid-template-columns: 1fr 300px; gap: 22px; margin-bottom: 30px; align-items: start; }
.tool-workspace { min-width: 0; }
.steps { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.step { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 8px 16px; font-size: 13px; display: flex; align-items: center; gap: 8px; }
.step-num { background: var(--grad); color: #fff; border-radius: 50%; width: 21px; height: 21px; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; }
.upload-box, .ai-box { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); padding: 26px; box-shadow: var(--shadow); }
.upload-zone { border: 2px dashed #D8CFFF; border-radius: 12px; padding: 46px 20px; text-align: center; cursor: pointer; transition: all .22s; }
.upload-zone:hover, .upload-zone.drag { border-color: var(--primary); background: linear-gradient(135deg, #F6F2FF, #FBF8FF); }
.upload-icon { font-size: 46px; margin-bottom: 10px; }
.upload-title { font-weight: 700; margin-bottom: 6px; font-size: 16px; }
.upload-zone p { margin-bottom: 6px; }
.upload-zone .btn { margin-top: 14px; }
.upload-box.processing .upload-zone { pointer-events: none; opacity: .5; }
.param-box { background: #FAF9FF; border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px; margin-bottom: 16px; }
.param-row { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 12px; }
.param-row:last-child { margin-bottom: 0; }
.param-row > label { font-size: 13.5px; font-weight: 600; color: #4A4A5A; min-width: 64px; padding-top: 6px; }
.param-options { display: flex; gap: 8px; flex-wrap: wrap; }
.param-opt { display: inline-flex; align-items: center; gap: 5px; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 7px 12px; font-size: 13px; cursor: pointer; transition: all .2s; }
.param-opt:hover { border-color: var(--primary); }
.param-opt input { accent-color: var(--primary); }
.param-wm input[type=text] { flex: 1; min-width: 180px; padding: 8px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 13px; font-family: inherit; }
.param-wm input[type=text]:focus { outline: none; border-color: var(--primary); }
.param-opt select { border: 1px solid var(--border); border-radius: 6px; padding: 4px 6px; font-size: 12.5px; background: #fff; color: #4A4A5A; cursor: pointer; }
.param-box-title { font-weight: 700; font-size: 14.5px; margin-bottom: 12px; color: var(--text); }
.feature-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin-bottom: 16px; }
.fs-item { display: flex; align-items: center; gap: 10px; background: linear-gradient(135deg, #F6F3FF, #FBF8FF); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.fs-icon { font-size: 24px; }
.fs-item b { font-size: 13.5px; display: block; }
.fs-item p { font-size: 11.5px; color: var(--muted); }
.task-list { margin-top: 14px; max-height: 280px; overflow-y: auto; }
.task-row { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 6px; background: #fff; font-size: 13px; }
.task-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #4A4A5A; }
.task-status { font-size: 12.5px; color: var(--muted); }
.task-status.ok { color: #1E9E58; font-weight: 600; }
.task-status.err { color: #E5484D; font-weight: 600; }
.task-dl { color: var(--primary); font-weight: 600; font-size: 12.5px; padding: 3px 10px; border: 1px solid #D6E0FF; border-radius: 6px; }
.task-dl:hover { background: #F3F0FF; }
.clip-list { margin: 12px 0; max-height: 300px; overflow-y: auto; }
.clip-item { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 6px; background: #fff; font-size: 13px; transition: all .2s; }
.clip-item:hover { border-color: var(--primary); background: #F8F6FF; }
.clip-num { background: var(--grad); color: #fff; border-radius: 50%; width: 22px; height: 22px; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; flex-shrink: 0; }
.clip-name { flex: 1; text-align: left; color: #4A4A5A; }
.clip-dl { color: var(--primary); font-weight: 600; font-size: 12.5px; }
.bw-word { display: inline-block; background: #FFE3E3; color: #C0392B; border-radius: 4px; padding: 1px 6px; margin: 0 2px; font-size: 12.5px; }
.copy-block { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; margin: 8px 0; font-size: 14px; line-height: 1.7; cursor: pointer; white-space: pre-wrap; }
.copy-block:hover { border-color: var(--primary); background: #F8F6FF; }
.result-block { text-align: left; }
.result-block b { display: block; margin: 10px 0 4px; font-size: 13.5px; }
.ai-select-row { margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.ai-select { border: 1.5px solid var(--border); border-radius: 8px; padding: 8px 12px; font-size: 14px; background: #fff; }
.title-chip { display: inline-block; background: #E8F7EE; color: #1E7A44; border-radius: 6px; padding: 3px 10px; margin: 3px 4px 3px 0; font-size: 13px; cursor: pointer; }
.title-chip:hover { background: #D2F0DD; }
.result-banner.lite { background: #F3F0FF; color: #5A4A9A; }
.hist-list { padding: 24px 0 60px; max-width: 720px; }
.hist-item { display: flex; align-items: center; justify-content: space-between; gap: 12px; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; margin-bottom: 10px; }
.hist-main b { font-size: 14.5px; margin-right: 10px; }
.hist-badge { display: inline-block; background: #F3F0FF; color: #5A4A9A; border-radius: 6px; padding: 2px 8px; font-size: 11.5px; margin-left: 6px; }
.hist-badge.warn { background: #FFF4E5; color: #B26A00; }
.hist-actions { display: flex; gap: 10px; align-items: center; }
.hist-dl { color: var(--primary); font-weight: 600; font-size: 13px; }
.hist-del { color: #E5484D; font-size: 12px; background: none; border: none; cursor: pointer; }
.hist-empty { text-align: center; padding: 80px 0; }
.bar { height: 9px; background: #EEEAF8; border-radius: 5px; margin: 16px 0 8px; overflow: hidden; }
.bar-fill { height: 100%; width: 0; background: var(--grad); border-radius: 5px; transition: width .3s; }
.upload-result { text-align: center; padding: 18px 0; }
.result-icon { font-size: 42px; margin-bottom: 8px; }
.upload-result .ok { font-size: 19px; margin-bottom: 16px; color: #1E9E58; font-weight: 700; }
.result-actions .btn { margin: 0 6px 10px; }
.ai-box textarea, .ai-box input[type=text] { width: 100%; padding: 15px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 14.5px; margin-bottom: 12px; font-family: inherit; transition: all .2s; background: #FBF9FF; }
.ai-box textarea:focus, .ai-box input[type=text]:focus { outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 4px rgba(110,58,255,.10); }
.ai-box textarea { resize: vertical; }
.ai-examples { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.chip { background: #F3F0FF; color: var(--primary); border: 1px solid #E4DDFF; border-radius: 20px; padding: 6px 14px; font-size: 12.5px; cursor: pointer; transition: all .2s; }
.chip:hover { background: var(--grad); color: #fff; border-color: transparent; }
.ai-box .btn-lg { width: 100%; }
.ai-note { text-align: center; margin-top: 12px; }
.ai-note-link { color: var(--primary); font-weight: 600; text-decoration: underline; }
#aiResult { margin-top: 18px; padding: 20px; background: #FAF8FF; border-radius: 12px; border: 1px solid var(--border); animation: fadeIn .3s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.result-banner { padding: 14px 16px; border-radius: 10px; font-weight: 600; margin-bottom: 14px; }
.result-banner.safe { background: #E8F7EE; color: #1E7A44; }
.result-banner.warn { background: #FFF4E5; color: #B26A00; }
.badword-table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13.5px; }
.badword-table th, .badword-table td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.badword-table th { background: linear-gradient(135deg, #F3F0FF, #F8F4FF); }
.badword-table tr:nth-child(even) { background: #FCFBFF; }
.title-list { margin: 12px 0 0; list-style: none; }
.title-list li { padding: 12px 16px; cursor: pointer; border-radius: 10px; margin-bottom: 8px; border: 1.5px solid var(--border); display: flex; justify-content: space-between; align-items: center; transition: all .2s; background: #fff; }
.title-list li:hover { background: #F3F0FF; border-color: var(--primary); transform: translateX(3px); }
.copy-hint { font-size: 12px; color: var(--muted); }
.member-strip { display: flex; align-items: center; justify-content: space-between; gap: 12px; background: linear-gradient(90deg, #F7F3FF, #FFF); border: 1px solid #E4DDFF; border-radius: var(--radius); padding: 16px 20px; margin-top: 18px; }
.member-strip b { font-size: 15px; }
.tool-side { display: flex; flex-direction: column; gap: 14px; position: sticky; top: 80px; }
.side-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.side-card h3 { font-size: 15.5px; margin-bottom: 14px; }
.side-card ul { list-style: none; font-size: 13.5px; color: #4A4A5A; margin-bottom: 16px; }
.side-card li { padding: 5px 0; }
.side-card-lite { background: linear-gradient(160deg, #F6F3FF, #FBF8FF); }
.seo-content { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); padding: 30px; margin-bottom: 40px; }
.seo-content h2 { font-size: 19px; margin: 20px 0 10px; font-family: 'SmileySans'; letter-spacing: .5px; }
.seo-content h2:first-child { margin-top: 0; }
.seo-content p { color: #4A4A5A; font-size: 14.5px; }

/* ===== 定价页（Synthesia 式：白卡片 + 紫色高亮） ===== */
.pricing-page { padding: 56px 0 60px; }
.pricing-head { text-align: center; margin-bottom: 44px; }
.pricing-head h1 { font-family: 'SmileySans'; font-size: 38px; margin-bottom: 12px; letter-spacing: .5px; }
.pricing-head p { color: var(--muted); font-size: 15.5px; }
.plan-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 20px; margin-bottom: 44px; }
.plan { background: #fff; border: 1.5px solid var(--border); border-radius: 18px; padding: 32px 26px; display: flex; flex-direction: column; gap: 14px; position: relative; box-shadow: var(--shadow); transition: all .25s; }
.plan:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.plan-hot { border: 2px solid var(--primary); }
.plan-best { border: 2px solid #FFB020; }
.plan h3 { font-size: 17px; }
.price { font-size: 38px; font-weight: 800; }
.price span { font-size: 14px; font-weight: 400; color: var(--muted); }
.plan ul { list-style: none; font-size: 13.5px; color: #4A4A5A; flex: 1; }
.plan li { padding: 5px 0; }
.badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--grad); color: #fff; font-size: 12px; padding: 4px 16px; border-radius: 20px; white-space: nowrap; box-shadow: 0 4px 12px rgba(110,58,255,.30); }
.plan-best .badge { background: linear-gradient(120deg, #FFC24B, #FF9F1C); box-shadow: 0 4px 12px rgba(255,160,30,.35); }
.save { font-size: 13.5px; color: var(--primary); font-weight: 600; }
.pricing-note { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }

/* ===== 文章页（SEO 内容） ===== */
.page-head { padding: 44px 0 10px; }
.page-head h1 { font-family: 'SmileySans'; font-size: 30px; margin-bottom: 6px; }
.article-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; padding: 30px 0 50px; }
.article-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; transition: all .22s; }
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.article-card h2 { font-size: 16.5px; margin-bottom: 8px; line-height: 1.4; }
.article-page { max-width: 760px; margin: 40px auto 60px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; }
.article-page h1 { font-family: 'SmileySans'; font-size: 28px; line-height: 1.3; margin-bottom: 14px; }
.article-intro { font-size: 15px; color: #4A4A5A; border-left: 4px solid var(--primary); padding-left: 14px; margin-bottom: 24px; }
.article-page h2 { font-size: 19px; margin: 26px 0 10px; }
.article-page p { font-size: 15px; color: #4A4A5A; line-height: 1.8; }
.article-tip { background: #FFF7E6; border: 1px solid #F5E3B8; border-radius: 10px; padding: 14px 18px; margin: 24px 0; font-size: 14px; }
.article-tools { border-top: 1px solid var(--border); padding-top: 18px; margin-top: 10px; }
.article-tools .tool-chip { display: inline-block; margin-top: 8px; }

.login-page { max-width: 420px; margin: 60px auto; }
.login-box { background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 34px 30px; box-shadow: var(--shadow); }
.login-box h1 { font-family: 'SmileySans'; font-size: 24px; margin-bottom: 8px; text-align: center; }
.login-box .muted { text-align: center; margin-bottom: 24px; }
.login-step label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 8px; color: #4A4A5A; }
.login-step input { width: 100%; padding: 13px 15px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 15px; margin-bottom: 14px; font-family: inherit; box-sizing: border-box; }
.login-step input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(110,58,255,.1); }
.login-step .btn-lg { width: 100%; }
.login-step .btn-ghost { width: 100%; margin-top: 8px; }
.login-step .muted { margin-top: 12px; font-size: 12.5px; }

/* ===== 底部 ===== */
.site-footer { background: #fff; border-top: 1px solid var(--border); padding: 34px 0; text-align: center; margin-top: 40px; }
.site-footer p { margin-bottom: 5px; font-size: 13px; color: #4A4A5A; }
.beian-link { color: #4A4A5A; font-size: 12.5px; }
.beian-link:hover { color: var(--primary); }
.site-footer .logo-text { font-size: 18px; display: inline-block; margin-bottom: 8px; }

/* ===== 404 ===== */
.page-404 { text-align: center; padding: 100px 0; }
.page-404 h1 { font-family: 'SmileySans'; font-size: 64px; color: var(--primary); }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .feature-grid, .why-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .hero { padding: 44px 0 30px; }
  .hero-title { font-size: 32px; }
  .hero-sub { font-size: 15px; }
  .feature-grid, .why-grid, .tool-main { grid-template-columns: 1fr; }
  .tool-side { position: static; }
  .site-header nav { display: none; }
  .plan-grid { grid-template-columns: 1fr; }
  .tool-hero-icon { width: 64px; height: 64px; font-size: 34px; }
  .tool-hero h1 { font-size: 22px; }
  .member-strip { flex-direction: column; align-items: stretch; text-align: center; }
  .demo-body { grid-template-columns: 1fr; }
  .demo-left { border-right: none; border-bottom: 1px solid var(--border); flex-direction: row; }
  .trust-inner { gap: 16px; }
  .hero-product { grid-template-columns: 1fr; padding: 24px 20px; }
  .hero-product-side { flex-direction: row; }
  .hero-product-title { font-size: 22px; }
}