/* ===== 词镜AI教学工场 · SaaS 平台样式 ===== */
:root {
  --brand: #185FA5;
  --brand-deep: #0E3E6E;
  --accent: #44C2A8;
  --ink: #1A2230;
  --body: #4E5969;
  --muted: #86909C;
  --line: #E8EBF0;
  --bg: #F6F8FB;
  --bg-blue: #F0F6FC;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino GB", "Microsoft YaHei", sans-serif;
  color: var(--body); line-height: 1.7; background: #fff;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ---- 顶部导航 ---- */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.9); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1160px; margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; gap: 28px;
}
.brand-mark {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 800; color: var(--brand-deep); letter-spacing: 1px;
}
.brand-dot {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 15px;
}
.brand-mark small { font-size: 11px; font-weight: 600; color: var(--accent); letter-spacing: 2px; }
.nav-inner nav { display: flex; gap: 4px; margin-left: auto; }
.nav-inner nav a {
  font-size: 14.5px; color: var(--ink); font-weight: 500;
  padding: 7px 14px; border-radius: 8px; transition: all .2s;
}
.nav-inner nav a:hover { background: var(--bg-blue); color: var(--brand); }
.nav-inner nav a.active { background: var(--bg-blue); color: var(--brand); font-weight: 700; }
.nav-cta {
  margin-left: 18px; padding: 8px 20px !important;
  background: linear-gradient(135deg, var(--brand), #2377c4);
  color: #fff !important; border-radius: 8px !important;
}
.nav-cta:hover { filter: brightness(1.08); }

/* ---- Hero ---- */
.hero {
  position: relative; overflow: hidden; text-align: center;
  padding: 84px 0 64px;
  background:
    radial-gradient(720px 320px at 18% -8%, rgba(68,194,168,.16), transparent 60%),
    radial-gradient(860px 380px at 82% 0%, rgba(24,95,165,.14), transparent 62%),
    linear-gradient(180deg, #FBFDFF 0%, #F2F7FC 100%);
}
.hero .badge {
  display: inline-block; margin-bottom: 18px;
  font-size: 13px; letter-spacing: 1px; color: var(--brand);
  background: rgba(24,95,165,0.08); border: 1px solid rgba(24,95,165,0.15);
  border-radius: 20px; padding: 5px 16px;
}
.hero h1 {
  font-size: 40px; font-weight: 800; letter-spacing: 1px; line-height: 1.35;
  color: var(--ink); margin-bottom: 14px;
}
.hero h1 em { font-style: normal; background: linear-gradient(120deg, var(--brand), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .sub { font-size: 16px; color: var(--muted); max-width: 680px; margin: 0 auto 30px; }

.search-box {
  max-width: 560px; margin: 0 auto 26px;
  display: flex; align-items: center; gap: 8px;
  background: #fff; border: 1.5px solid var(--line); border-radius: 12px;
  padding: 6px 6px 6px 18px; text-align: left;
  box-shadow: 0 8px 26px rgba(24,95,165,0.08);
}
.search-box svg { flex: none; opacity: .45; }
.search-box input {
  flex: 1; border: none; outline: none; font-size: 15px; color: var(--ink);
  font-family: inherit; background: transparent;
}
.search-box button {
  border: none; cursor: pointer; font-family: inherit;
  background: linear-gradient(135deg, var(--brand), #2377c4);
  color: #fff; font-size: 14.5px; font-weight: 600;
  border-radius: 9px; padding: 11px 26px;
}
.scene-chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.scene-chips a, .scene-chips span {
  font-size: 13.5px; color: var(--body);
  background: #fff; border: 1px solid var(--line);
  border-radius: 20px; padding: 6px 18px; transition: all .2s; cursor: pointer;
}
.scene-chips span:hover { border-color: var(--accent); color: var(--brand); }

/* ---- 数据条 ---- */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.stats-grid {
  max-width: 1160px; margin: 0 auto; padding: 26px 24px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; text-align: center;
}
.stats-grid b { display: block; font-size: 26px; color: var(--brand); font-weight: 800; letter-spacing: 1px; }
.stats-grid span { font-size: 13px; color: var(--muted); letter-spacing: 2px; }

/* ---- section 基础 ---- */
section { padding: 72px 0; }
section.soft { background: var(--bg); }
.sec-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 34px; flex-wrap: wrap; }
.sec-head .kicker { font-size: 13px; font-weight: 700; letter-spacing: 3px; color: var(--accent); margin-bottom: 8px; }
.sec-head h2 { font-size: 27px; color: var(--ink); font-weight: 800; letter-spacing: 1px; }
.sec-head p { margin-top: 8px; color: var(--muted); font-size: 14.5px; max-width: 640px; }

/* ---- 技能市场：筛选 + 卡片 ---- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.filter-bar .chip {
  font-size: 13.5px; color: var(--body); background: #fff;
  border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 18px; cursor: pointer; transition: all .2s; user-select: none;
}
.filter-bar .chip:hover { border-color: var(--brand); color: var(--brand); }
.filter-bar .chip.on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }

.skill-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.skill-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 20px; transition: all .25s;
  display: flex; flex-direction: column;
}
.skill-card:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(17,24,39,0.09); border-color: transparent; }
.skill-card.hide { display: none; }
.skill-card .icon {
  width: 42px; height: 42px; border-radius: 11px; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--accent));
}
.skill-card.c-lesson .icon { background: linear-gradient(135deg, #185FA5, #3E8FD8); }
.skill-card.c-quiz   .icon { background: linear-gradient(135deg, #44C2A8, #2BA58B); }
.skill-card.c-data   .icon { background: linear-gradient(135deg, #5B8DEF, #185FA5); }
.skill-card.c-home   .icon { background: linear-gradient(135deg, #F0A64B, #E07B39); }
.skill-card.c-research .icon { background: linear-gradient(135deg, #8A6FE8, #5F49C4); }
.skill-card .t { font-size: 16.5px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.skill-card .d { font-size: 13.5px; color: var(--body); line-height: 1.65; flex: 1; }
.skill-card .tags { margin-top: 14px; display: flex; gap: 6px; flex-wrap: wrap; }
.skill-card .tags i {
  font-style: normal; font-size: 11.5px; color: var(--brand);
  background: var(--bg-blue); border-radius: 5px; padding: 2px 9px;
}

/* ---- 提示词库 ---- */
.prompt-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.prompt-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 20px; display: flex; flex-direction: column; transition: all .25s;
}
.prompt-card:hover { box-shadow: 0 10px 24px rgba(17,24,39,0.08); }
.prompt-card .cat { font-size: 12px; font-weight: 700; color: var(--accent); letter-spacing: 2px; margin-bottom: 8px; }
.prompt-card .t { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.prompt-card pre {
  flex: 1; white-space: pre-wrap; word-break: break-all;
  font-family: inherit; font-size: 13px; color: var(--body); line-height: 1.7;
  background: var(--bg); border-radius: 8px; padding: 12px 14px; margin-bottom: 14px;
}
.copy-btn {
  align-self: flex-start; border: 1px solid var(--brand); background: transparent;
  color: var(--brand); font-family: inherit; font-size: 13px; font-weight: 600;
  border-radius: 7px; padding: 6px 18px; cursor: pointer; transition: all .2s;
}
.copy-btn:hover { background: var(--brand); color: #fff; }
.copy-btn.done { border-color: var(--accent); color: var(--accent); }

/* ---- 场景方案 ---- */
.flow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.flow-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; transition: all .25s;
}
.flow-card:hover { box-shadow: 0 10px 24px rgba(17,24,39,0.08); }
.flow-card .step-no { font-size: 12.5px; font-weight: 700; color: var(--accent); letter-spacing: 2px; margin-bottom: 10px; }
.flow-card .t { font-size: 17.5px; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.flow-steps { list-style: none; counter-reset: fs; }
.flow-steps li {
  position: relative; padding-left: 30px; margin-bottom: 10px;
  font-size: 13.5px; color: var(--body); line-height: 1.65;
  counter-increment: fs;
}
.flow-steps li::before {
  content: counter(fs);
  position: absolute; left: 0; top: 1px;
  width: 21px; height: 21px; border-radius: 50%;
  background: var(--bg-blue); color: var(--brand);
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.flow-card .gain {
  margin-top: 14px; font-size: 13px; font-weight: 600; color: var(--brand);
  background: var(--bg-blue); border-radius: 8px; padding: 8px 14px;
}

/* ---- 占位栏目 ---- */
.soon-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.soon-card {
  position: relative; overflow: hidden;
  background: #fff; border: 1px dashed #C9D4E0; border-radius: var(--radius);
  padding: 28px 24px;
}
.soon-card .tag-soon {
  position: absolute; top: 16px; right: 16px;
  font-size: 11.5px; font-weight: 700; letter-spacing: 1px;
  color: var(--accent); background: rgba(68,194,168,0.12);
  border-radius: 5px; padding: 3px 10px;
}
.soon-card .t { font-size: 17px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.soon-card .d { font-size: 13.5px; color: var(--muted); line-height: 1.7; }

/* ---- 规划条 ---- */
.roadmap {
  margin-top: 16px; text-align: center;
  background: var(--bg-blue); border-radius: 10px; padding: 14px 20px;
  font-size: 13.5px; color: var(--body); letter-spacing: 0.5px;
}
.roadmap b { color: var(--brand); font-weight: 700; }

/* ---- CTA ---- */
.cta-band {
  background: linear-gradient(135deg, #0E3E6E, #185FA5 55%, #2AA88F);
  border-radius: 18px; color: #fff; text-align: center;
  padding: 52px 32px;
}
.cta-band h2 { font-size: 26px; font-weight: 800; letter-spacing: 1px; margin-bottom: 10px; }
.cta-band p { font-size: 14.5px; opacity: .85; margin-bottom: 24px; }
.cta-band .btn {
  display: inline-block; background: #fff; color: var(--brand);
  font-size: 15px; font-weight: 700; border-radius: 9px; padding: 12px 36px;
  transition: all .2s;
}
.cta-band .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.2); }

/* ---- 页脚（SaaS 简洁版）---- */
footer { background: #fff; border-top: 1px solid var(--line); padding: 56px 24px 28px; margin-top: 80px; }
.footer-cols {
  max-width: 1160px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 36px;
}
.footer-cols .col .h { font-size: 13.5px; font-weight: 700; color: var(--ink); margin-bottom: 14px; letter-spacing: 1px; }
.footer-cols .col a { display: block; font-size: 13.5px; color: var(--muted); margin-bottom: 10px; transition: color .2s; }
.footer-cols .col a:hover { color: var(--brand); }
.footer-intro p { font-size: 13.5px; color: var(--muted); line-height: 1.8; margin-top: 12px; max-width: 300px; }
.footer-base {
  max-width: 1160px; margin: 36px auto 0; padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: 12.5px; color: var(--muted); letter-spacing: 1px;
}

/* ---- 成果预览相框墙 ---- */
.frame-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.shot-frame.wide { grid-column: span 2; }
@media (max-width: 900px) { .frame-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .frame-grid { grid-template-columns: 1fr; } .shot-frame.wide { grid-column: span 1; } }

.shot-frame {
  margin: 0; background: #fff;
  border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  box-shadow: 0 10px 30px rgba(24,95,165,0.10);
  transition: all .25s;
}
.shot-frame:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(24,95,165,0.16); }
.shot-frame .chrome {
  display: flex; align-items: center; gap: 6px;
  background: linear-gradient(180deg,#F2F5F9,#E8EDF3);
  border-bottom: 1px solid var(--line);
  padding: 9px 14px;
}
.shot-frame .chrome i {
  width: 10px; height: 10px; border-radius: 50%;
  background: #D5DDE7;
}
.shot-frame .chrome i:nth-child(1) { background: #F6BE4F; }
.shot-frame .chrome i:nth-child(2) { background: #61C554; }
.shot-frame .chrome i:nth-child(3) { background: #EC6A5E; }
.shot-frame .chrome span {
  margin-left: 8px; font-size: 12px; color: var(--muted); letter-spacing: 1px;
}
.shot-frame img { width: 100%; aspect-ratio: 1536 / 1024; object-fit: cover; }
.shot-frame figcaption {
  padding: 13px 16px; font-size: 14.5px; font-weight: 700; color: var(--ink);
  display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--line);
}
.badge-ex {
  font-size: 11px; font-weight: 600; letter-spacing: 1px;
  color: var(--accent); background: rgba(68,194,168,0.12);
  border-radius: 5px; padding: 2px 9px;
}

/* ---- 三步说明条 ---- */
.how-pill { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.how-pill b {
  font-size: 12.5px; color: var(--brand); font-weight: 700;
  background: #fff; border: 1px solid rgba(24,95,165,0.25);
  border-radius: 20px; padding: 6px 15px; letter-spacing: 0.5px;
}

/* ---- 安装指令按钮 ---- */
.install-btn {
  margin-top: 14px; width: 100%;
  border: none; cursor: pointer; font-family: inherit;
  font-size: 13.5px; font-weight: 700; letter-spacing: 1px;
  color: #fff; border-radius: 8px; padding: 10px 0;
  background: linear-gradient(135deg, var(--brand), #2377c4);
  transition: all .2s;
}
.install-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.install-btn.done { background: linear-gradient(135deg, #35AE92, var(--accent)); }

/* ---- toast ---- */
.toast {
  position: fixed; bottom: 34px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: #fff; font-size: 13.5px;
  border-radius: 8px; padding: 10px 22px; opacity: 0; pointer-events: none;
  transition: all .3s; z-index: 200; letter-spacing: 1px;
}
.toast.show { opacity: .94; transform: translateX(-50%) translateY(0); }

/* ---- 响应式 ---- */
@media (max-width: 900px) {
  .skill-grid { grid-template-columns: repeat(2, 1fr); }
  .prompt-grid, .flow-grid { grid-template-columns: 1fr; }
  .soon-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 20px; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 30px; }
}
@media (max-width: 600px) {
  .nav-inner nav { display: none; }
  .skill-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 25px; }
  .hero { padding: 60px 0 48px; }
}

/* ---- 官网同款 logo ---- */
.brand-mark .logo-img { height: 38px; width: auto; display: inline-block; }
.brand-mark { gap: 12px; }
.footer-intro .logo-img { height: 34px; }

/* ---- 旗舰技能卡 ---- */
.skill-card.flagship {
  border: 1.5px solid transparent;
  background:
    linear-gradient(#fff, #fff) padding-box,
    linear-gradient(135deg, var(--brand), var(--accent)) border-box;
  grid-column: span 2;
}
@media (max-width: 900px) { .skill-card.flagship { grid-column: span 2; } }
@media (max-width: 600px) { .skill-card.flagship { grid-column: span 1; } }
.skill-card.flagship .icon { background: linear-gradient(135deg, #E8A23D, #D97730); }
.skill-card.flagship .t a:hover { color: var(--brand); }
.skill-card.flagship::after {
  content: "FLAGSHIP";
  position: absolute; top: 14px; right: 14px;
  font-size: 10.5px; font-weight: 800; letter-spacing: 2px;
  color: var(--accent);
}
.skill-card { position: relative; }

/* ---- 多页版补充 ---- */
.hero.slim { padding: 64px 0 52px; }
.hero.slim h1 { font-size: 34px; margin-bottom: 12px; }
.portal-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.portal-card {
  display: block; background: #fff; border: 1px solid var(--line);
  border-radius: 14px; padding: 28px 26px; transition: all .25s;
}
.portal-card:hover { transform: translateY(-4px); box-shadow: 0 14px 32px rgba(17,24,39,0.10); border-color: transparent; }
.portal-card.main { grid-column: span 2; }
@media (max-width: 700px) { .portal-grid { grid-template-columns: 1fr; } .portal-card.main { grid-column: span 1; } }
.portal-card .pk { font-size: 11.5px; font-weight: 800; letter-spacing: 3px; color: var(--accent); margin-bottom: 10px; }
.portal-card.flagship-p .pk { color: var(--brand); }
.portal-card .t { font-size: 21px; font-weight: 800; color: var(--ink); margin-bottom: 8px; letter-spacing: 1px; }
.portal-card p { font-size: 13.5px; color: var(--body); line-height: 1.75; margin-bottom: 14px; }
.portal-card .go { font-size: 13.5px; font-weight: 700; color: var(--brand); }
.portal-card.flagship-p {
  background: linear-gradient(135deg, #FBF6EE, #FDF0E7);
  border-color: rgba(217,119,48,0.25);
}
.skill-card.c-ppt .icon { background: linear-gradient(135deg, #E8A23D, #D97730); }
.footer-cols .col a[href="#"] { pointer-events: auto; }

/* ---- 图片弹出层 Lightbox ---- */
.lightbox {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(10,20,35,.86); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity .22s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox .lb-stage { max-width: min(1180px, 92vw); max-height: 86vh; display: flex; align-items: center; gap: 14px; }
.lightbox .lb-img-wrap {
  border-radius: 12px; overflow: hidden;
  box-shadow: 0 24px 60px rgba(0,0,0,.45);
  line-height: 0; max-height: 86vh;
}
.lightbox img.lb-img {
  max-width: min(1000px, 84vw); max-height: 86vh; width: auto; height: auto;
  display: block; object-fit: contain;
}
.lightbox .lb-cap {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,.85); font-size: 13.5px; letter-spacing: 1px;
}
.lightbox .lb-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.14); color: #fff; font-size: 20px;
  transition: background .2s; font-family: inherit; line-height: 1;
}
.lightbox .lb-btn:hover { background: rgba(255,255,255,.28); }
.lightbox .lb-prev { left: 26px; }
.lightbox .lb-next { right: 26px; }
.lightbox .lb-close {
  position: absolute; top: 20px; right: 22px;
  width: 42px; height: 42px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.12); color: #fff; font-size: 18px;
}
.lightbox .lb-close:hover { background: rgba(236,106,94,.6); }