/* ============================================================
   睿答官网 · 设计系统
   与桌面端/管理后台同源（docs/ui-design-v1.md §5）：
   主色 Shopee 橙 #ee4d2d，深色面 #0f172a，浅底 #f5f7fa。
   零依赖：无字体 CDN、无组件库、无构建步骤。
   ============================================================ */

:root {
  --primary: #ee4d2d;
  --primary-hover: #d64524;
  --primary-soft: rgba(238, 77, 45, 0.08);
  --dark: #0f172a;
  --dark-2: #1e293b;
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --card: #ffffff;
  --border: #e5e9f0;
  --text: #1e293b;
  --text-sub: #64748b;
  --text-muted: #94a3b8;
  --success: #10b981;
  --danger: #ef4444;
  --radius: 14px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.16);
  --maxw: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei',
    'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.3; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 820px; }

/* ---------------------------- 按钮 ---------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-lg { padding: 13px 26px; font-size: 16px; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(238, 77, 45, 0.28);
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--text-muted); }
.ghost-link { color: var(--text-sub); font-size: 14px; }
.ghost-link:hover { color: var(--primary); }
.ghost-link.small { font-size: 13px; }

/* ---------------------------- 顶栏 ---------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.nav.scrolled { border-color: var(--border); box-shadow: var(--shadow-sm); }
.nav-inner { display: flex; align-items: center; gap: 32px; height: 64px; }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), #f97316);
  color: #fff; font-weight: 700; font-size: 17px;
  box-shadow: 0 4px 12px rgba(238, 77, 45, 0.3);
}
.brand-mark.small { width: 30px; height: 30px; font-size: 15px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 16px; }
.brand-text em { font-style: normal; font-size: 11px; color: var(--text-muted); letter-spacing: 0.08em; }

.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: 15px; color: var(--text-sub); }
.nav-links a:hover { color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 16px; }

/* ---------------------------- Hero ---------------------------- */
.hero {
  position: relative;
  padding: 72px 0 0;
  background:
    radial-gradient(1000px 420px at 78% -8%, rgba(238, 77, 45, 0.12), transparent 62%),
    linear-gradient(180deg, #fff7f4 0%, #ffffff 46%, var(--bg-soft) 100%);
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  padding-bottom: 56px;
}
.pill {
  display: inline-block;
  padding: 5px 13px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 { font-size: 50px; font-weight: 800; letter-spacing: -0.02em; }
.hero h1 .hl {
  background: linear-gradient(120deg, var(--primary), #f97316);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede { margin-top: 20px; font-size: 17px; color: var(--text-sub); max-width: 540px; }
.hero-cta { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.hero-meta { margin-top: 16px; font-size: 13px; color: var(--text-muted); }

/* 客户端界面示意 */
.hero-shot { position: relative; }
.shot {
  position: relative;
  z-index: 2;
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  transform: perspective(1400px) rotateY(-7deg) rotateX(2deg);
}
.shot-glow {
  position: absolute;
  inset: 18% -8% -16% 12%;
  background: radial-gradient(60% 60% at 50% 50%, rgba(238, 77, 45, 0.22), transparent 70%);
  filter: blur(38px);
  z-index: 1;
}
.shot-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 14px;
  background: var(--dark);
  color: #cbd5e1;
  font-size: 12px;
}
.shot-bar i { width: 9px; height: 9px; border-radius: 50%; background: #475569; }
.shot-bar i:first-child { background: #ef4444; }
.shot-bar i:nth-child(2) { background: #f59e0b; }
.shot-bar i:nth-child(3) { background: #10b981; }
.shot-bar span { margin-left: 10px; }
.shot-body { display: grid; grid-template-columns: 116px 1fr; min-height: 300px; }
.shot-side { background: var(--dark); padding: 14px 10px; }
.shot-logo {
  width: 26px; height: 26px; border-radius: 7px; margin: 0 auto 14px;
  display: grid; place-items: center; font-size: 13px; color: #fff;
  background: linear-gradient(135deg, var(--primary), #f97316);
}
.shot-side ul { display: flex; flex-direction: column; gap: 3px; }
.shot-side li {
  font-size: 11.5px; color: #94a3b8; padding: 7px 9px; border-radius: 7px;
}
.shot-side li.on { background: rgba(238, 77, 45, 0.16); color: #fff; font-weight: 600; }
.shot-main { position: relative; background: var(--bg-soft); display: flex; flex-direction: column; }

/* 轮播 */
.shot-carousel { flex: 1; overflow: hidden; }
.shot-track {
  display: flex;
  width: 300%;
  height: 100%;
  animation: shotScroll 17.4s ease-in-out infinite;
}
.shot-carousel:hover .shot-track { animation-play-state: paused; }
@keyframes shotScroll {
  0%, 28.7% { transform: translateX(0); }
  33.3%, 62.1% { transform: translateX(-33.333%); }
  66.7%, 95.4% { transform: translateX(-66.666%); }
  100% { transform: translateX(0); }
}
.shot-slide { width: 33.333%; padding: 16px; flex: none; display: flex; flex-direction: column; }
.shot-dots {
  display: flex; justify-content: center; gap: 7px;
  padding: 9px 0 11px;
}
.shot-dots i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.35;
  animation: dotPulse 17.4s ease-in-out infinite;
}
.shot-dots i.on { animation-name: dot1; }
.shot-dots i:nth-child(2) { animation-name: dot2; }
.shot-dots i:nth-child(3) { animation-name: dot3; }
.shot-main:hover .shot-dots i { animation-play-state: paused; }
@keyframes dot1 {
  0%, 28.7%, 100% { opacity: 1; transform: scale(1.15); background: var(--primary); }
  33.3%, 95.4% { opacity: 0.35; transform: scale(1); background: var(--text-muted); }
}
@keyframes dot2 {
  0%, 28.7% { opacity: 0.35; transform: scale(1); background: var(--text-muted); }
  33.3%, 62.1% { opacity: 1; transform: scale(1.15); background: var(--primary); }
  66.7%, 100% { opacity: 0.35; transform: scale(1); background: var(--text-muted); }
}
@keyframes dot3 {
  0%, 62.1% { opacity: 0.35; transform: scale(1); background: var(--text-muted); }
  66.7%, 95.4% { opacity: 1; transform: scale(1.15); background: var(--primary); }
  100% { opacity: 0.35; transform: scale(1); background: var(--text-muted); }
}

.shot-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; margin-bottom: 14px; }
.kpi {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 11px; display: flex; flex-direction: column;
}
.kpi b { font-size: 17px; color: var(--text); line-height: 1.2; }
.kpi span { font-size: 10.5px; color: var(--text-muted); }
.kpi.ok b { color: var(--success); font-size: 15px; }
.chat { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 13px; }
.msg { font-size: 12.5px; border-radius: 9px; padding: 9px 11px; margin-bottom: 9px; max-width: 92%; }
.msg.buyer { background: #f1f5f9; color: var(--text-sub); }
.msg.ai { background: var(--primary-soft); border: 1px solid rgba(238, 77, 45, 0.2); color: var(--text); margin-left: auto; }
.msg .tag {
  display: inline-block; font-size: 10px; font-weight: 700; color: var(--primary);
  background: #fff; border: 1px solid rgba(238, 77, 45, 0.28);
  border-radius: 5px; padding: 0 5px; margin-right: 6px;
}
.msg-actions { display: flex; gap: 7px; justify-content: flex-end; }
.chip {
  font-size: 11px; padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--text-sub); background: #fff;
}
.chip.on { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }

/* 生成依据 / 标签 */
.evidence {
  margin-top: auto;
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 11px 13px;
}
.ev-h {
  font-size: 11px; font-weight: 700; color: var(--text);
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.ev-h span { font-weight: 400; color: var(--success); font-size: 10.5px; }
.ev-list { display: flex; flex-wrap: wrap; gap: 6px; }
.ev-tag {
  font-size: 10px; padding: 3px 8px; border-radius: 999px;
  border: 1px solid transparent; font-weight: 600;
}
.ev-tag.product { background: #ecfdf5; color: #047857; border-color: #a7f3d0; }
.ev-tag.policy { background: #eff6ff; color: #1d4ed8; border-color: #bfdbfe; }
.ev-tag.taboo { background: #fef2f2; color: #b91c1c; border-color: #fecaca; }

/* 一键学习 */
.shot-headline {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.shot-headline h4 { font-size: 15px; }
.learn-list {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 13px; flex: 1; display: flex; flex-direction: column; gap: 10px;
}
.learn-item { font-size: 12px; }
.learn-q { color: var(--text-sub); margin-bottom: 4px; }
.learn-a { color: var(--text); padding-left: 10px; border-left: 2px solid var(--border); }
.learn-arrow { text-align: center; font-size: 11px; color: var(--text-muted); }
.learn-result {
  background: #f8fafc; border: 1px dashed var(--border); border-radius: 9px;
  padding: 11px; font-size: 12.5px;
}
.learn-result b { display: block; color: var(--text); margin: 5px 0 3px; }
.learn-result small { color: var(--text-muted); font-size: 10px; }

/* AI 对话演练 */
.rehearsal-banner {
  background: linear-gradient(90deg, #eef2ff, #fff);
  border: 1px solid #c7d2fe; border-radius: 10px;
  padding: 9px 12px; margin-bottom: 12px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 11.5px;
}
.rehearsal-banner b { color: #4f46e5; }
.rehearsal-banner span { color: var(--text-muted); }
.rehearsal-hint {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px;
}
.rehearsal-input {
  margin-top: auto;
  display: flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 7px 7px 14px;
}
.rehearsal-input span {
  flex: 1; font-size: 12px; color: var(--text-muted);
}
.rehearsal-input button {
  background: var(--primary); color: #fff; border: 0; border-radius: 999px;
  padding: 5px 13px; font-size: 11px; font-weight: 600;
}

/* 信任条 */
.trust {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: -34px;
  position: relative;
  z-index: 3;
  box-shadow: var(--shadow-md);
}
.trust > div { background: #fff; padding: 18px 22px; display: flex; flex-direction: column; }
.trust b { font-size: 15px; }
.trust span { font-size: 13px; color: var(--text-muted); }

/* ---------------------------- 通用分区 ---------------------------- */
.section { padding: 96px 0; }
.section-soft { background: var(--bg-soft); }
.section-dark { background: linear-gradient(160deg, #111827 0%, #1e293b 100%); color: #e2e8f0; }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }
.sec-head h2 { font-size: 33px; font-weight: 750; }
.sec-head p { margin-top: 12px; color: var(--text-sub); font-size: 16px; }
.sec-head-dark h2 { color: #fff; }
.sec-head-dark p { color: #94a3b8; }

.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: #d7dde8; }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--text-sub); font-size: 14.5px; }
.ico {
  width: 42px; height: 42px; border-radius: 11px;
  display: grid; place-items: center; font-size: 20px; margin-bottom: 14px;
}
.i-orange { background: #fff1ed; }
.i-blue { background: #eff6ff; }
.i-violet { background: #eef2ff; }
.i-green { background: #ecfdf5; }
.i-amber { background: #fffbeb; }
.i-slate { background: #f1f5f9; }

/* ---------------------------- 安全对比 ---------------------------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.cmp {
  border-radius: var(--radius);
  padding: 26px 26px 28px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
}
.cmp-tag {
  display: inline-block; font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px; margin-bottom: 12px;
}
.cmp-bad .cmp-tag { background: rgba(239, 68, 68, 0.16); color: #fca5a5; }
.cmp-good .cmp-tag { background: rgba(16, 185, 129, 0.16); color: #6ee7b7; }
.cmp h3 { font-size: 20px; color: #fff; margin-bottom: 16px; }
.cmp ul { display: flex; flex-direction: column; gap: 11px; }
.cmp li { position: relative; padding-left: 26px; font-size: 15px; color: #cbd5e1; }
.cmp li::before {
  position: absolute; left: 0; top: 0; font-weight: 700;
}
.cmp-bad li::before { content: '✕'; color: #f87171; }
.cmp-good li::before { content: '✓'; color: #34d399; }
.cmp-good { border-color: rgba(238, 77, 45, 0.45); background: rgba(238, 77, 45, 0.07); }
.sec-note {
  margin-top: 26px; text-align: center; font-size: 14px; color: #94a3b8;
}

/* ---------------------------- 三步 ---------------------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: s; }
.steps li {
  position: relative;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px 26px;
}
.step-n {
  position: absolute; top: -16px; left: 24px;
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--primary), #f97316);
  box-shadow: 0 6px 14px rgba(238, 77, 45, 0.3);
}
.steps h3 { font-size: 17px; margin: 10px 0 8px; }
.steps p { color: var(--text-sub); font-size: 14.5px; }

/* ---------------------------- 下载 ---------------------------- */
.dl-card {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  padding: 28px 32px; box-shadow: var(--shadow-md); flex-wrap: wrap;
}
.dl-left { display: flex; align-items: center; gap: 20px; }
.dl-os {
  width: 62px; height: 62px; border-radius: 15px; flex: none;
  display: grid; place-items: center; color: var(--primary);
  background: var(--primary-soft);
}
.dl-left h3 { font-size: 19px; }
.dl-meta { color: var(--text-sub); font-size: 14px; margin-top: 4px; }
.dl-hash { font-size: 11.5px; color: var(--text-muted); font-family: ui-monospace, Consolas, monospace; margin-top: 3px; word-break: break-all; }
.dl-right { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }

.dl-tips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 22px; }
.dl-tips > div { display: flex; flex-direction: column; font-size: 13.5px; }
.dl-tips b { color: var(--text); }
.dl-tips span { color: var(--text-muted); }

/* ---------------------------- 答得准 / 智能学习 ---------------------------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 8px; }
.split > div {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 26px 28px;
}
.split h3 { font-size: 18px; margin-bottom: 16px; display: flex; align-items: center; gap: 9px; }
.split .tag-bad { color: var(--danger); }
.split .tag-good { color: var(--success); }
.split ul { display: flex; flex-direction: column; gap: 13px; }
.split li { position: relative; padding-left: 24px; font-size: 14.5px; color: var(--text-sub); }
.split li::before { position: absolute; left: 0; top: 1px; font-weight: 700; }
.split li b { color: var(--text); }
.problem li::before { content: '✕'; color: #f87171; }
.solution li::before { content: '✓'; color: #34d399; }

.points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 22px; }
.point {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 22px; display: flex; gap: 14px; align-items: flex-start;
}
.point .num {
  flex: none; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  font-weight: 700; font-size: 14px; color: #fff; background: linear-gradient(135deg, var(--primary), #f97316);
}
.point h4 { font-size: 15.5px; margin-bottom: 5px; }
.point p { color: var(--text-sub); font-size: 14px; }

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.feature-card { padding: 28px 26px; }
.feature-card .ico { margin-bottom: 12px; }
.feature-card h3 { font-size: 19px; margin-bottom: 10px; }
.feature-card p { color: var(--text-sub); font-size: 14.5px; }
.feature-card ul { margin-top: 14px; display: flex; flex-direction: column; gap: 9px; }
.feature-card li { position: relative; padding-left: 22px; font-size: 14px; color: var(--text-sub); }
.feature-card li::before { content: '✓'; position: absolute; left: 0; top: 0; color: var(--primary); font-weight: 700; }

/* ---------------------------- FAQ ---------------------------- */
details {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}
summary {
  cursor: pointer; font-weight: 600; font-size: 16.5px; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: '+'; color: var(--text-muted); font-size: 22px; font-weight: 400; flex: none;
  transition: transform 0.18s;
}
details[open] summary::after { content: '−'; }
details p { margin-top: 12px; color: var(--text-sub); font-size: 15px; }

/* ---------------------------- CTA / 页脚 ---------------------------- */
.cta {
  background: linear-gradient(135deg, #fff3ef 0%, var(--bg-soft) 100%);
  border-top: 1px solid var(--border);
  padding: 60px 0;
}
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 26px; flex-wrap: wrap; }
.cta h2 { font-size: 27px; }
.cta p { color: var(--text-sub); margin-top: 8px; }

.foot { background: var(--dark); color: #94a3b8; padding: 46px 0 40px; font-size: 14px; }
.foot-inner { display: grid; grid-template-columns: 1.2fr 1fr 1.4fr; gap: 32px; }
.foot-brand { display: flex; gap: 12px; align-items: flex-start; }
.foot-brand strong { color: #fff; font-size: 15px; }
.foot-brand p { margin-top: 4px; font-size: 13px; }
.foot-links { display: flex; flex-direction: column; gap: 9px; }
.foot-links a:hover { color: #fff; }
.foot-org p { margin-bottom: 6px; }
.foot-org .dim { color: #64748b; font-size: 12.5px; margin-top: 12px; }

/* ---------------------------- 响应式 ---------------------------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 38px; }
  .shot { transform: none; }
  .grid-3, .steps, .compare, .dl-tips, .grid-2, .split, .points { grid-template-columns: 1fr; }
  .trust { grid-template-columns: repeat(2, 1fr); }
  .foot-inner { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .section { padding: 64px 0; }
  .step-n { position: static; margin-bottom: 6px; }
}
@media (max-width: 560px) {
  .hero h1 { font-size: 31px; }
  .sec-head h2 { font-size: 25px; }
  .trust { grid-template-columns: 1fr; }
  .dl-right { align-items: stretch; width: 100%; }
  .dl-right .btn { width: 100%; }
}