/* ============================================
   ThinkAlike - 产品 Landing 页共享组件库
   风格延续首页（xtech 复刻），主色 #1677ff / hero #031d6a
   ============================================ */

/* ====== Landing Hero ====== */
.lp-hero {
  position: relative; min-height: 86vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden; padding: 150px 24px 96px;
  background: #031d6a; z-index: 1;
}
.lp-hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: url(../images/hero-bg.jpg) center/cover no-repeat; opacity: .16;
}
.lp-hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(1100px 480px at 50% -12%, var(--lp-glow, rgba(22,119,255,.42)), transparent 62%);
}
.lp-hero-inner { position: relative; z-index: 2; max-width: 860px; text-align: center; width: 100%; }
.lp-crumb {
  position: absolute; top: calc(var(--nav-height) + 14px); left: 50%; transform: translateX(-50%);
  z-index: 3; font-size: 13px; color: rgba(255,255,255,.6);
}
.lp-crumb a { color: rgba(255,255,255,.78); text-decoration: none; }
.lp-crumb a:hover { color: #fff; }
.lp-tag {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 14px; border-radius: 20px;
  font-size: 13px; font-weight: 500; color: rgba(255,255,255,.88); background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.16); margin-bottom: 20px;
}
.lp-title { margin-bottom: 14px; }
.lp-title span { display: block; font-size: clamp(30px, 6.2vw, 58px); font-weight: 800; letter-spacing: -1px; line-height: 1.14; color: #fff; }
.lp-title .lp-accent {
  background: linear-gradient(135deg, var(--lp-a1, #40a9ff), var(--lp-a2, #69c0ff));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  font-size: clamp(22px, 4.6vw, 42px) !important; margin-top: 4px;
}
.lp-sub { font-size: clamp(17px, 2.6vw, 23px); font-weight: 700; color: var(--accent); letter-spacing: 3px; margin-bottom: 14px; }
.lp-desc { font-size: 15px; color: rgba(255,255,255,.74); line-height: 1.85; max-width: 620px; margin: 0 auto 30px; }
.lp-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-trial {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 30px; border-radius: 10px;
  font-size: 15px; font-weight: 700; text-decoration: none; color: #fff;
  background: linear-gradient(135deg, var(--lp-btn1, #1677ff), var(--lp-btn2, #0b3ea8));
  box-shadow: 0 8px 24px rgba(22,119,255,.42); transition: all .25s;
}
.btn-trial:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(22,119,255,.5); }
.btn-trial svg { transition: transform .25s; }
.btn-trial:hover svg { transform: translateX(3px); }
.lp-hero-visual { position: relative; z-index: 2; margin: 46px auto 0; max-width: 940px; }

/* ====== Generic landing sections ====== */
.lp-light { background: #fff; }
.lp-gray { background: var(--bg-section); }
.lp-inner { max-width: 1080px; margin: 0 auto; }

/* ====== Feature grid ====== */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feat-grid.two { grid-template-columns: repeat(2, 1fr); }
.feat-grid.four { grid-template-columns: repeat(4, 1fr); }
.feat-card {
  background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 30px 26px;
  transition: all .3s cubic-bezier(0.16,1,0.3,1); opacity: 0; transform: translateY(26px);
}
.feat-card.visible { opacity: 1; transform: translateY(0); }
.feat-card:hover { border-color: transparent; box-shadow: 0 18px 40px rgba(10,64,115,.12); transform: translateY(-4px); }
.feat-ico {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px; color: #fff; background: linear-gradient(135deg, var(--lp-a1, #1677ff), var(--lp-a2, #4096ff));
}
.feat-card h3 { font-size: 17px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.feat-card p { font-size: 13.5px; color: var(--text-secondary); line-height: 1.8; }

/* ====== Split (text + media mock) ====== */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 52px; align-items: center; }
.split + .split { margin-top: 64px; }
.split.flip .split-media { order: -1; }
.split-text h3 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; color: var(--text); margin-bottom: 14px; letter-spacing: -.4px; }
.split-text .lead { font-size: 15px; color: var(--text-secondary); line-height: 1.85; margin-bottom: 18px; }
.split-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.split-list li { display: flex; gap: 11px; align-items: flex-start; font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.split-list li svg { flex: none; margin-top: 3px; color: var(--primary); }
.split-list li b { color: var(--text); font-weight: 600; }

/* ====== Browser mock window ====== */
.mock {
  background: #fff; border: 1px solid var(--border); border-radius: 14px; overflow: hidden;
  box-shadow: 0 30px 70px rgba(10,64,115,.16); opacity: 0; transform: translateY(26px);
  transition: all .5s cubic-bezier(0.16,1,0.3,1);
}
.mock.visible { opacity: 1; transform: translateY(0); }
.mock-bar { display: flex; align-items: center; gap: 7px; padding: 12px 15px; border-bottom: 1px solid var(--border); background: #f7f8fa; }
.mock-dot { width: 11px; height: 11px; border-radius: 50%; background: #d7dbe0; }
.mock-dot.r { background: #ff6b6b; } .mock-dot.y { background: #ffc53d; } .mock-dot.g { background: #52c41a; }
.mock-url { margin-left: 8px; flex: 1; height: 22px; border-radius: 6px; background: #eceff3; display: flex; align-items: center; padding: 0 10px; font-size: 11px; color: #98a1ad; }
.mock-body { padding: 20px; display: grid; gap: 14px; }
.mock-side { display: flex; gap: 14px; }
.mock-nav { flex: none; width: 68px; display: grid; gap: 8px; }
.mock-nav span { height: 9px; border-radius: 5px; background: #e9edf2; }
.mock-nav span.on { background: var(--lp-a1, #1677ff); width: 80%; }
.mock-main { flex: 1; display: grid; gap: 10px; }
.mock-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.mock-kpi { border: 1px solid var(--border); border-radius: 10px; padding: 12px; }
.mock-kpi b { display: block; font-size: 18px; color: var(--text); font-weight: 800; }
.mock-kpi small { font-size: 10px; color: var(--text-muted); }
.mock-card { border: 1px solid var(--border); border-radius: 10px; padding: 14px; }
.bar { height: 8px; border-radius: 5px; background: #eef1f5; overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 5px; background: linear-gradient(90deg, var(--lp-a1, #1677ff), var(--lp-a2, #69c0ff)); }
.mock-line { height: 9px; border-radius: 5px; background: #eef1f5; }
.mock-line.w80 { width: 80%; } .mock-line.w60 { width: 60%; } .mock-line.w40 { width: 40%; }

/* ====== Stats ====== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; text-align: center; }
.stat { padding: 22px 12px; border-radius: 14px; background: #fff; border: 1px solid var(--border); opacity: 0; transform: translateY(26px); transition: all .5s cubic-bezier(0.16,1,0.3,1); }
.stat.visible { opacity: 1; transform: translateY(0); }
.stat-num { font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--primary); letter-spacing: -1px; }
.stat-num .u { font-size: 16px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 6px; }

/* ====== Chips ====== */
.chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.chip { padding: 9px 18px; border-radius: 999px; background: var(--primary-bg); color: var(--primary); font-size: 13px; font-weight: 600; border: 1px solid rgba(22,119,255,.12); }

/* ====== Steps ====== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step { position: relative; padding: 26px 20px; border-radius: 14px; background: #fff; border: 1px solid var(--border); opacity: 0; transform: translateY(26px); transition: all .5s cubic-bezier(0.16,1,0.3,1); }
.step.visible { opacity: 1; transform: translateY(0); }
.step-no { width: 40px; height: 40px; border-radius: 12px; background: linear-gradient(135deg, var(--lp-a1, #1677ff), var(--lp-a2, #4096ff)); color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 17px; margin-bottom: 14px; }
.step h4 { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 7px; }
.step p { font-size: 13px; color: var(--text-secondary); line-height: 1.75; }

/* ====== Pricing / edition cards ====== */
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.plan { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 30px 26px; display: flex; flex-direction: column; opacity: 0; transform: translateY(26px); transition: all .5s cubic-bezier(0.16,1,0.3,1); }
.plan.visible { opacity: 1; transform: translateY(0); }
.plan.hot { border-color: var(--primary); box-shadow: 0 20px 50px rgba(22,119,255,.14); }
.plan-tag { align-self: flex-start; font-size: 12px; font-weight: 700; letter-spacing: 1px; color: var(--primary); background: var(--primary-bg); padding: 4px 12px; border-radius: 6px; margin-bottom: 14px; }
.plan h4 { font-size: 19px; font-weight: 800; color: var(--text); margin-bottom: 6px; }
.plan .plan-sub { font-size: 13px; color: var(--text-muted); margin-bottom: 18px; }
.plan ul { list-style: none; display: grid; gap: 11px; margin-bottom: 22px; }
.plan ul li { display: flex; gap: 9px; align-items: flex-start; font-size: 13.5px; color: var(--text-secondary); line-height: 1.6; }
.plan ul li svg { flex: none; margin-top: 3px; color: var(--primary); }
.plan .plan-cta { margin-top: auto; text-align: center; }

/* ====== Dark CTA band ====== */
.cta-band { position: relative; overflow: hidden; border-radius: 22px; padding: 60px 40px; text-align: center; background: linear-gradient(135deg, #0a2f86, #1677ff); color: #fff; }
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; margin-bottom: 12px; letter-spacing: -.5px; }
.cta-band p { font-size: 15px; color: rgba(255,255,255,.82); margin-bottom: 26px; max-width: 560px; margin-inline: auto; }

/* ====== Case study (中船党校) ====== */
.case { background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 36px; display: grid; grid-template-columns: 1.3fr 1fr; gap: 36px; align-items: center; }
.case-badge { display: inline-flex; gap: 6px; align-items: center; font-size: 12px; font-weight: 700; color: var(--accent); background: #fff7e6; border: 1px solid #ffe7ba; padding: 5px 12px; border-radius: 6px; margin-bottom: 14px; }
.case h3 { font-size: 21px; font-weight: 800; margin-bottom: 12px; color: var(--text); }
.case p { font-size: 14px; color: var(--text-secondary); line-height: 1.85; }
.case-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.case-metric { border: 1px solid var(--border); border-radius: 12px; padding: 18px; text-align: center; background: var(--bg-section); }
.case-metric b { display: block; font-size: 24px; color: var(--primary); font-weight: 800; }
.case-metric small { font-size: 12px; color: var(--text-muted); }

/* ====== Icon rail (small feature strip) ====== */
.rail { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.rail-item { display: flex; gap: 12px; align-items: center; padding: 18px; border-radius: 12px; background: #fff; border: 1px solid var(--border); }
.rail-ico { width: 40px; height: 40px; flex: none; border-radius: 10px; background: var(--primary-bg); color: var(--primary); display: flex; align-items: center; justify-content: center; }
.rail-item span { font-size: 14px; font-weight: 600; color: var(--text); }

/* ====== FAQ (GEO / AEO 问答式抽取内容) ====== */
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 20px 24px; transition: box-shadow .3s, border-color .3s; }
.faq-item:hover { border-color: var(--primary); box-shadow: 0 10px 30px rgba(22,119,255,.08); }
.faq-q { font-size: 17px; font-weight: 700; color: var(--text); margin: 0 0 8px; display: flex; gap: 10px; align-items: baseline; }
.faq-q::before { content: "Q"; flex: none; width: 22px; height: 22px; border-radius: 6px; background: var(--primary-bg); color: var(--primary); font-size: 12px; font-weight: 800; display: inline-flex; align-items: center; justify-content: center; transform: translateY(2px); }
.faq-a { margin: 0; font-size: 15px; line-height: 1.8; color: #4e5969; }
.faq-a b { color: var(--text); }

/* ====== Reveal helper (used by main.js observer) ====== */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: all .55s cubic-bezier(0.16,1,0.3,1); }
[data-reveal].visible { opacity: 1; transform: translateY(0); }

/* ====== Responsive ====== */
@media (max-width: 1024px) {
  .feat-grid.four { grid-template-columns: repeat(2, 1fr); }
  .rail { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .feat-grid, .feat-grid.two { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 30px; }
  .split.flip .split-media { order: 0; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .plan-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .case { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .feat-grid, .feat-grid.two, .feat-grid.four, .steps, .rail { grid-template-columns: 1fr; }
  .lp-hero { min-height: 92vh; padding: 120px 16px 72px; }
  .mock-kpis { grid-template-columns: repeat(2, 1fr); }
}