/* trenmi.com · 静态站样式
   设计系统对齐 AI Agent Logo：藏蓝 #002448 / 青绿 #06B096 / 亮青 #3FD0B0 / 米白 #FDFCF8
   零外部依赖：系统字体 + 内联 SVG，push 到 Cloudflare Pages 即可跑。
*/

:root {
  --navy: #002448;
  --navy-deep: #001C3D;
  --navy-mid: #0A3159;
  --navy-mid-2: #123A5E;
  --teal: #06B096;
  --teal-light: #3FD0B0;
  --teal-tint: #E4F4F0;
  --cream: #FDFCF8;
  --paper: #F2F7F6;
  --ink: #002448;
  --ink-2: #4E6A72;
  --ink-3: #6E878B;
  --line: #DDE8E5;
  --on-dark-1: #FDFCF8;
  --on-dark-2: #A9C6D0;
  --on-dark-3: #8FB4C2;
  --on-dark-4: #5E8296;
  --on-dark-soft: #C9DEE6;
  --accent-orange: #FF7A45;

  --font-sans: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-display: "Outfit","PingFang SC",-apple-system,BlinkMacSystemFont,sans-serif;

  --maxw: 1440px;
  --gutter: 48px;
  --radius: 16px;
  --radius-pill: 999px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }

img, svg { display: block; max-width: 100%; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ============ Header ============ */
.site-header {
  background: var(--cream);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-logo {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.5px;
}
.nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  transition: color .15s;
}
.nav a:hover { color: var(--navy); }
.nav a.active { color: var(--teal); font-weight: 600; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--teal);
  color: #fff !important;
  font-size: 15px;
  font-weight: 600;
  transition: background .15s;
}
.nav-cta:hover { background: #059A84; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 30px;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform .12s, background .15s, box-shadow .15s;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--teal);
  color: #fff;
}
.btn-primary:hover { background: #059A84; }
.btn-ghost-dark {
  background: var(--navy-mid);
  color: var(--on-dark-soft);
}
.btn-ghost-light {
  background: #fff;
  color: var(--navy);
  border: 1px solid var(--line);
}
.btn-lg { padding: 16px 34px; font-size: 17px; }

/* ============ Eyebrow ============ */
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--teal);
  margin-bottom: 0;
}

/* ============ Home Hero ============ */
.hero {
  background: var(--navy);
  color: var(--on-dark-1);
  padding: 80px 0 96px;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-left { display: flex; flex-direction: column; gap: 22px; }
.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--teal-light);
}
.hero-title {
  font-size: 54px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--on-dark-1);
}
.hero-sub {
  font-size: 18px;
  line-height: 1.7;
  color: var(--on-dark-2);
  max-width: 640px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-trust {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--on-dark-3);
  margin-top: 6px;
}
.hero-trust .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--teal-light); }

/* Hero 画布工作台示意 */
.canvas-mock {
  background: var(--navy-mid);
  border-radius: var(--radius);
  padding: 16px;
  position: relative;
  min-height: 360px;
}
.canvas-mock .toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--navy-mid-2);
  border-radius: 8px;
  margin-bottom: 14px;
}
.canvas-mock .dots { display: flex; gap: 6px; }
.canvas-mock .dots span {
  width: 9px; height: 9px; border-radius: 50%;
  background: #3D5F7E;
}
.canvas-mock .dots span.live { background: var(--teal); }
.canvas-mock .tool-label {
  font-size: 12px;
  color: var(--on-dark-3);
  background: var(--navy);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}
.canvas-mock .nodes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.canvas-mock .node {
  background: var(--cream);
  border-radius: 10px;
  padding: 12px;
  min-height: 88px;
}
.canvas-mock .node.dark { background: var(--navy-mid-2); }
.canvas-mock .node .tag {
  font-size: 11px;
  font-weight: 600;
  color: var(--teal);
  margin-bottom: 6px;
}
.canvas-mock .node .body {
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.4;
}
.canvas-mock .node.dark .tag { color: var(--teal-light); }
.canvas-mock .node.dark .body { color: var(--on-dark-1); }
.canvas-mock .node.wide { grid-column: span 2; }
.canvas-mock .bars {
  display: flex;
  align-items: flex-end;
  gap: 5px;
  height: 40px;
  margin-top: 6px;
}
.canvas-mock .bars span {
  width: 10px;
  border-radius: 2px;
  background: #1D5C7A;
}
.canvas-mock .bars span.hi { background: var(--teal); }
.canvas-mock .bars span.top { background: var(--teal-light); }
.canvas-mock .note {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: var(--navy);
  color: var(--on-dark-3);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
}

/* ============ Stats Band ============ */
.stats {
  background: var(--cream);
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}
.stats .wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat { text-align: left; }
.stat .num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
}
.stat .num .unit {
  font-size: 18px;
  font-weight: 600;
  color: var(--teal);
  margin-left: 4px;
}
.stat .label {
  font-size: 14px;
  color: var(--ink-2);
  margin-top: 8px;
}

/* ============ Section ============ */
.section { padding: 88px 0; }
.section.paper { background: var(--paper); }
.section.dark { background: var(--navy); color: var(--on-dark-1); }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  margin-bottom: 48px;
}
.section-head .left { max-width: 640px; display: flex; flex-direction: column; gap: 12px; }
.section-head h2 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--navy);
}
.section.dark .section-head h2 { color: var(--on-dark-1); }
.section-head .right { max-width: 420px; font-size: 16px; line-height: 1.7; color: var(--ink-2); }
.section.dark .section-head .right { color: var(--on-dark-2); }

/* ============ How It Works ============ */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
}
.step .no {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--teal);
  margin-bottom: 14px;
}
.step h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}
.step p { font-size: 15px; line-height: 1.7; color: var(--ink-2); }
.step .aside {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--ink-3);
}

/* ============ Feature Cards ============ */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card.dark {
  background: var(--navy);
  color: var(--on-dark-1);
  border-color: transparent;
}
.card.accent {
  border: 1.5px solid var(--teal);
}
.card .icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--teal-tint);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
}
.card.dark h3 { color: var(--on-dark-1); }
.card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}
.card.dark p { color: var(--on-dark-2); }
.card .link-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--navy-mid);
  color: var(--teal-light);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  align-self: flex-start;
}
.card .pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--teal-tint);
  color: var(--teal);
  font-size: 12px;
  font-weight: 600;
  align-self: flex-start;
}

/* ============ Final CTA ============ */
.cta-band {
  background: var(--teal);
  color: #fff;
  padding: 72px 0;
}
.cta-band .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.cta-band h2 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
}
.cta-band p {
  margin-top: 10px;
  font-size: 16px;
  line-height: 1.7;
  color: #D6F2EC;
  max-width: 700px;
}
.cta-band .btn-white {
  background: #fff;
  color: var(--teal);
  font-family: var(--font-display);
}
.cta-band .btn-white:hover { background: #F0FAF7; }

/* ============ Footer ============ */
.site-footer {
  background: var(--navy-deep);
  color: var(--on-dark-2);
  padding: 56px 0 32px;
}
.site-footer .top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.site-footer .f-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.site-footer .f-brand .brand-name { color: var(--on-dark-1); }
.site-footer .f-tag {
  font-size: 14px;
  line-height: 1.7;
  color: var(--on-dark-4);
  max-width: 420px;
}
.site-footer .cols {
  display: flex;
  gap: 72px;
}
.site-footer .col h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--teal-light);
  margin-bottom: 12px;
}
.site-footer .col a {
  display: block;
  font-size: 14px;
  color: var(--on-dark-2);
  padding: 4px 0;
  transition: color .15s;
}
.site-footer .col a:hover { color: var(--on-dark-1); }
.site-footer .bottom {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 13px;
  color: var(--on-dark-4);
}

/* ============ Inner Page Hero ============ */
.inner-hero {
  background: var(--navy);
  color: var(--on-dark-1);
  padding: 72px 0 80px;
}
.inner-hero.paper { background: var(--paper); color: var(--ink); }
.inner-hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
}
.inner-hero h1 {
  font-size: 50px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--on-dark-1);
  margin: 14px 0 18px;
}
.inner-hero.paper h1 { color: var(--navy); }
.inner-hero .sub {
  font-size: 18px;
  line-height: 1.7;
  color: var(--on-dark-2);
  max-width: 560px;
}
.inner-hero.paper .sub { color: var(--ink-2); }
.inner-hero .chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.inner-hero .chip {
  background: var(--navy-mid);
  color: var(--on-dark-soft);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
}
.inner-hero .btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* Canvas page hero board */
.canvas-board {
  background: var(--navy-mid);
  border-radius: var(--radius);
  padding: 14px;
  position: relative;
  min-height: 300px;
}

/* OPC course structure panel */
.struct-panel {
  background: var(--navy);
  border-radius: 20px;
  padding: 32px;
  color: var(--on-dark-1);
}
.struct-panel h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}
.struct-panel .desc {
  font-size: 14px;
  color: var(--on-dark-3);
  margin-bottom: 20px;
}
.phase {
  background: var(--navy-mid);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 10px;
}
.phase:last-child { margin-bottom: 0; }
.phase.live { background: var(--teal); }
.phase .pt {
  font-size: 15px;
  font-weight: 600;
  color: var(--teal-light);
}
.phase.live .pt { color: #fff; }
.phase .pd {
  font-size: 13px;
  color: var(--on-dark-2);
  margin-top: 4px;
}
.phase.live .pd { color: #E0F7F2; }

/* Module grid */
.modules {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.module {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.module.dark { background: var(--navy); border-color: transparent; }
.module .no {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--teal);
}
.module.dark .no { color: var(--teal-light); }
.module h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--navy);
}
.module.dark h3 { color: var(--on-dark-1); }
.module p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}
.module.dark p { color: var(--on-dark-2); }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .hero .wrap, .inner-hero .wrap { grid-template-columns: 1fr; }
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
  .steps, .cards-3, .modules { grid-template-columns: repeat(2, 1fr); }
  .section-head { flex-direction: column; align-items: flex-start; }
  .cta-band .wrap { flex-direction: column; align-items: flex-start; }
  .site-footer .top { flex-direction: column; }
  .site-footer .cols { gap: 40px; }
}
@media (max-width: 640px) {
  .hero-title, .inner-hero h1 { font-size: 36px; }
  .section-head h2, .cta-band h2 { font-size: 28px; }
  .stats .wrap, .steps, .cards-3, .modules { grid-template-columns: 1fr; }
  .canvas-mock .nodes { grid-template-columns: repeat(2, 1fr); }
  .nav { display: none; }
  :root { --gutter: 24px; }
}

/* ============ Download Card ============ */
.dl-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.dl-card.dark { background: var(--navy); border-color: transparent; color: var(--on-dark-1); }
.dl-card .dl-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--teal-tint);
  display: flex; align-items: center; justify-content: center;
}
.dl-card.dark .dl-icon { background: rgba(6,176,150,.16); }
.dl-card h3 { font-size: 22px; font-weight: 700; color: var(--navy); }
.dl-card.dark h3 { color: var(--on-dark-1); }
.dl-card p { font-size: 15px; line-height: 1.7; color: var(--ink-2); }
.dl-card.dark p { color: var(--on-dark-2); }
.dl-card .btn { margin-top: 4px; align-self: flex-start; }
.dl-card .meta {
  font-size: 13px; color: var(--ink-3);
  display: flex; gap: 8px; align-items: center;
}
.dl-card.dark .meta { color: var(--on-dark-3); }
.dl-card .meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--teal); }

/* ============ Course Outline ============ */
.outline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.outline .mod {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.outline .mod .head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.outline .mod .no { font-family: var(--font-display); font-size: 13px; font-weight: 700; color: var(--teal); }
.outline .mod h3 { font-size: 20px; font-weight: 700; color: var(--navy); }
.outline .mod .desc { font-size: 14px; line-height: 1.7; color: var(--ink-2); margin-bottom: 14px; }
.outline .mod .deliver {
  font-size: 13px; color: var(--teal); font-weight: 600;
  padding: 6px 12px; background: var(--teal-tint); border-radius: var(--radius-pill);
  display: inline-block; margin-bottom: 14px;
}
.outline .mod ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.outline .mod li { font-size: 14px; color: var(--ink-2); display: flex; gap: 10px; line-height: 1.6; }
.outline .mod li::before { content: "·"; color: var(--teal); font-weight: 700; flex-shrink: 0; }
@media (max-width: 1024px) { .outline { grid-template-columns: 1fr; } }