/* 墨香国学AI Demo V1.0 升级版统一样式 */
:root {
  --bg: #04050a;
  --bg-soft: #0c1018;
  --paper: #f6ead3;
  --paper-ink: #352719;
  --card: rgba(255, 255, 255, 0.074);
  --card-strong: rgba(255, 255, 255, 0.12);
  --ink: #f8f1e5;
  --muted: #b9ad9c;
  --gold: #d8b56c;
  --gold-2: #f0d58e;
  --gold-soft: rgba(216, 181, 108, 0.18);
  --cyan: #7ee4d3;
  --cyan-soft: rgba(126, 228, 211, 0.14);
  --red: #8f1d24;
  --red-soft: rgba(143, 29, 36, 0.24);
  --rule: rgba(248, 241, 229, 0.15);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.36);
  --radius: 26px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, var(--red-soft), transparent 32rem),
    radial-gradient(circle at 88% 8%, var(--cyan-soft), transparent 34rem),
    radial-gradient(circle at 52% 100%, var(--gold-soft), transparent 42rem),
    var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(248, 241, 229, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(248, 241, 229, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at 50% 15%, black, transparent 76%);
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 48px;
  position: relative;
  z-index: 1;
}

/* 顶部导航 */
.topbar {
  position: sticky;
  top: 14px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: rgba(9, 12, 18, 0.78);
  backdrop-filter: blur(22px);
  box-shadow: var(--shadow);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.brand strong {
  display: block;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
}
.brand small {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  margin-top: 3px;
}
.brand-seal {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--bg);
  font-weight: 900;
  background: linear-gradient(135deg, var(--gold), #b84a35);
  box-shadow: 0 0 28px var(--gold-soft);
}
.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav-links a {
  padding: 8px 10px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.86rem;
  transition: 0.2s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.08);
}

/* 成长系统 */
.growth-panel {
  margin: 18px 0 22px;
  border: 1px solid rgba(216, 181, 108, 0.24);
  border-radius: 24px;
  padding: 14px;
  background:
    radial-gradient(circle at 0 0, rgba(216, 181, 108, 0.14), transparent 20rem),
    rgba(255, 255, 255, 0.055);
  box-shadow: 0 18px 58px rgba(0, 0, 0, 0.24);
}
.growth-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.growth-title span {
  color: var(--muted);
  font-size: 0.88rem;
}
.growth-title strong {
  color: var(--cyan);
  font-size: 0.92rem;
}
.growth-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.growth-item {
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.06);
}
.growth-item span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
}
.growth-item strong {
  display: block;
  color: var(--gold);
  font-size: 1.55rem;
  line-height: 1.1;
}
.growth-track {
  height: 6px;
  margin-top: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}
.growth-track i {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  transition: width 0.45s ease;
}
.growth-item.bump { animation: bump 0.45s ease; }

/* 首页官网感 */
.hero {
  min-height: 70vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  align-items: center;
  gap: 22px;
  padding: 44px 0 24px;
}
.hero-card,
.page-card,
.content-card {
  border: 1px solid var(--rule);
  border-radius: 36px;
  background:
    radial-gradient(circle at 0% 0%, var(--gold-soft), transparent 22rem),
    linear-gradient(145deg, var(--card-strong), rgba(255, 255, 255, 0.035));
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-card {
  padding: clamp(28px, 5vw, 66px);
  position: relative;
}
.hero-card::after {
  content: "文";
  position: absolute;
  right: -14px;
  bottom: -92px;
  font-size: clamp(12rem, 26vw, 22rem);
  line-height: 1;
  font-weight: 900;
  color: rgba(216, 181, 108, 0.08);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  margin-bottom: 22px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--cyan);
  background: var(--cyan-soft);
  font-size: 0.82rem;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 16px var(--cyan);
}
h1 {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: clamp(3.2rem, 9vw, 7.4rem);
  line-height: 0.96;
  letter-spacing: -0.08em;
}
.subtitle {
  margin: 0 0 20px;
  font-size: clamp(1.35rem, 3vw, 2.45rem);
  line-height: 1.2;
  letter-spacing: -0.04em;
}
.hero-text,
.lead {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 58em;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
}
.hero-badges span {
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 7px 11px;
  color: var(--muted);
  background: rgba(255,255,255,.055);
  font-size: .85rem;
}
.hero-visual {
  min-height: 430px;
  border: 1px solid var(--rule);
  border-radius: 36px;
  background:
    radial-gradient(circle at 62% 16%, rgba(216, 181, 108, 0.24), transparent 11rem),
    linear-gradient(160deg, rgba(143, 29, 36, 0.48), transparent 42%),
    var(--card);
  position: relative;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-visual::before {
  content: "";
  position: absolute;
  inset: 36px;
  border: 1px solid rgba(216, 181, 108, 0.3);
  border-radius: 28px;
  background:
    linear-gradient(90deg, transparent 49%, rgba(216, 181, 108, 0.2) 50%, transparent 51%),
    linear-gradient(0deg, transparent 49%, rgba(216, 181, 108, 0.2) 50%, transparent 51%);
}
.moon {
  position: absolute;
  right: 50px;
  top: 48px;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff9eb, var(--gold) 46%, transparent 70%);
  animation: float 7s ease-in-out infinite;
}
.demo-window {
  position: absolute;
  left: 48px;
  right: 48px;
  bottom: 48px;
  z-index: 2;
  border: 1px solid var(--rule);
  border-radius: 24px;
  padding: 18px;
  background: rgba(6, 8, 12, 0.72);
  backdrop-filter: blur(18px);
}
.demo-window h3 { margin: 0 0 8px; color: var(--gold); }
.demo-window p { margin: 0; color: var(--muted); }
.brush-lines span {
  display: block;
  height: 10px;
  margin: 14px 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold), rgba(216, 181, 108, 0.1));
  transform-origin: left;
  animation: writeLine 1.1s ease both;
}
.brush-lines span:nth-child(2) { width: 76%; animation-delay: 0.2s; }
.brush-lines span:nth-child(3) { width: 54%; animation-delay: 0.4s; }
.entry-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}
.section-band {
  margin-top: 18px;
  border: 1px solid var(--rule);
  border-radius: 30px;
  padding: 26px;
  background: rgba(255,255,255,.055);
}
.section-band h2 {
  margin: 0 0 16px;
  color: var(--gold);
  letter-spacing: -0.04em;
}
.entry-card,
.info-card,
.choice-card,
.quote-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--card);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}
.entry-card:hover,
.choice-card:hover,
.quote-card:hover {
  transform: translateY(-6px);
  border-color: rgba(216, 181, 108, 0.45);
  background: var(--card-strong);
}
.entry-card b,
.info-card b {
  display: block;
  color: var(--cyan);
  font-size: 0.86rem;
  margin-bottom: 10px;
}
.entry-card h2,
.page-title,
.section-title {
  color: var(--gold);
}
.entry-card h2,
.info-card h3,
.choice-card h3,
.quote-card h3 {
  margin: 0 0 10px;
  line-height: 1.3;
}

/* 通用页面 */
.page-card {
  padding: clamp(24px, 4vw, 42px);
}
.page-title {
  margin: 0 0 10px;
  font-size: clamp(2.1rem, 5vw, 4rem);
  letter-spacing: -0.06em;
}
.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}
.side-nav {
  position: sticky;
  top: 138px;
  border: 1px solid var(--rule);
  border-radius: 22px;
  background: var(--card);
  padding: 14px;
}
.side-nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 14px;
  color: var(--muted);
  font-size: 0.92rem;
}
.side-nav a:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.08);
}

/* 书卷阅读页 */
.reading-wrap {
  border-radius: 28px;
  padding: 18px;
  background:
    linear-gradient(90deg, rgba(216,181,108,.10) 1px, transparent 1px),
    linear-gradient(rgba(216,181,108,.10) 1px, transparent 1px),
    rgba(246, 234, 211, 0.05);
  background-size: 38px 38px;
}
.reading-section {
  padding: 26px;
  border: 1px solid rgba(112, 82, 40, 0.28);
  border-radius: 24px;
  background:
    radial-gradient(circle at 0 0, rgba(216,181,108,.18), transparent 18rem),
    linear-gradient(180deg, rgba(246,234,211,.97), rgba(238,222,190,.94));
  margin-bottom: 16px;
  color: var(--paper-ink);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.28), 0 16px 45px rgba(0,0,0,.18);
}
.reading-section h2 {
  margin: 0 0 14px;
  color: #8a5a13;
  letter-spacing: -0.03em;
}
.reading-section p,
.reading-section li {
  color: #4c3924;
}
.classical {
  color: #2f2014 !important;
  font-size: 1.12rem;
  line-height: 2.1;
  letter-spacing: .03em;
}
.note-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.note-list li {
  padding: 14px 16px;
  border: 1px solid rgba(138, 90, 19, 0.22);
  border-radius: 16px;
  background: rgba(255, 250, 235, 0.55);
}

/* 按钮 */
.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.btn {
  appearance: none;
  border: 1px solid rgba(216, 181, 108, 0.45);
  border-radius: 999px;
  padding: 11px 16px;
  background: linear-gradient(135deg, var(--gold), #b98a3e);
  color: #08090d;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, filter 0.2s ease;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink);
  border-color: var(--rule);
}

/* 聊天 */
.chat-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
}
.question-list { display: grid; gap: 12px; align-content: start; }
.question-btn {
  text-align: left;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 14px 16px;
  color: var(--ink);
  background: var(--card);
  cursor: pointer;
  transition: 0.2s ease;
}
.question-btn:hover,
.question-btn.selected {
  border-color: rgba(126, 228, 211, 0.45);
  background: var(--card-strong);
  transform: translateY(-2px);
}
.chat-box {
  min-height: 520px;
  border: 1px solid var(--rule);
  border-radius: 28px;
  background:
    radial-gradient(circle at 100% 0, rgba(126,228,211,.11), transparent 22rem),
    rgba(255, 255, 255, 0.05);
  padding: 18px;
  display: flex;
  flex-direction: column;
}
.messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  padding-right: 6px;
}
.message {
  max-width: 84%;
  border: 1px solid var(--rule);
  border-radius: 20px;
  padding: 12px 14px;
  animation: pop 0.22s ease both;
}
.message.user {
  align-self: flex-end;
  background: rgba(126, 228, 211, 0.12);
  border-color: rgba(126, 228, 211, 0.32);
}
.message.ai {
  align-self: flex-start;
  background: rgba(216, 181, 108, 0.1);
  border-color: rgba(216, 181, 108, 0.28);
}
.message.typing {
  width: fit-content;
  color: var(--muted);
}
.chat-input {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}
.chat-input input,
.chat-input textarea {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 11px 14px;
  color: var(--ink);
  background: rgba(255,255,255,.07);
  outline: none;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
}
.chat-input textarea {
  border-radius: 18px;
  min-height: 44px;
  max-height: 120px;
}

/* 字帖 */
.copybook-grid { display: grid; gap: 22px; }
.copybook-card {
  border: 1px solid rgba(216, 181, 108, 0.32);
  border-radius: 28px;
  padding: 24px;
  background:
    linear-gradient(90deg, rgba(216, 181, 108, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(216, 181, 108, 0.08) 1px, transparent 1px),
    rgba(255, 250, 235, 0.06);
  background-size: 42px 42px;
}
.copybook-card h2 {
  color: var(--gold);
  margin: 0 0 16px;
}
.grid-chars {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.char-box {
  width: 76px;
  height: 76px;
  display: grid;
  place-items: center;
  position: relative;
  border: 1px solid rgba(216, 181, 108, 0.52);
  color: rgba(248, 241, 229, 0.95);
  font-size: 2rem;
  font-weight: 800;
  background:
    linear-gradient(45deg, transparent 49.4%, rgba(216, 181, 108, 0.26) 50%, transparent 50.6%),
    linear-gradient(-45deg, transparent 49.4%, rgba(216, 181, 108, 0.26) 50%, transparent 50.6%),
    linear-gradient(90deg, transparent 49.4%, rgba(216, 181, 108, 0.16) 50%, transparent 50.6%),
    linear-gradient(0deg, transparent 49.4%, rgba(216, 181, 108, 0.16) 50%, transparent 50.6%),
    rgba(0, 0, 0, 0.08);
  box-shadow: inset 0 0 18px rgba(216,181,108,.06);
}
.char-box::before {
  content: attr(data-char);
  position: absolute;
  color: rgba(143, 29, 36, 0.24);
  transform: translate(2px, 2px);
}
.char-box span {
  position: relative;
  z-index: 1;
}
.copy-zones {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 16px;
}
.copy-zone {
  min-height: 126px;
  border: 1px dashed rgba(216, 181, 108, 0.48);
  border-radius: 18px;
  padding: 14px;
  color: var(--muted);
  background:
    repeating-linear-gradient(to bottom, transparent 0 33px, rgba(216,181,108,.16) 34px),
    rgba(0, 0, 0, 0.12);
}

/* 思辨挑战 */
.choice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 22px 0;
}
.choice-card {
  min-height: 170px;
  position: relative;
  overflow: hidden;
}
.choice-card::after {
  content: "";
  position: absolute;
  inset: auto 18px 18px 18px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s ease;
}
.choice-card.selected {
  border-color: rgba(216,181,108,.62);
  box-shadow: 0 0 0 1px rgba(216,181,108,.16), 0 24px 70px rgba(216,181,108,.12);
  animation: selectPulse .45s ease;
}
.choice-card.selected::after {
  transform: scaleX(1);
}
.analysis-box {
  display: none;
  border: 1px solid rgba(126, 228, 211, 0.35);
  border-radius: 24px;
  padding: 22px;
  background: rgba(126, 228, 211, 0.08);
  animation: pop 0.25s ease both;
}
.analysis-box.show { display: block; }
.analysis-box h2 { color: var(--cyan); margin-top: 0; }
.analysis-box p {
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.analysis-box p:last-child { border-bottom: 0; }

.footer-tip {
  margin-top: 22px;
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}
.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 100;
  max-width: 320px;
  padding: 13px 16px;
  border: 1px solid rgba(126, 228, 211, 0.35);
  border-radius: 18px;
  color: var(--ink);
  background: rgba(10, 14, 20, 0.9);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: 0.25s ease;
}
.toast.show { opacity: 1; transform: translateY(0); }

@keyframes float {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(-14px, 18px, 0); }
}
@keyframes writeLine {
  from { transform: scaleX(0); opacity: 0; }
  to { transform: scaleX(1); opacity: 1; }
}
@keyframes pop {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes bump {
  0%,100% { transform: scale(1); }
  45% { transform: scale(1.035); }
}
@keyframes selectPulse {
  0% { transform: scale(1); }
  45% { transform: scale(1.025); }
  100% { transform: scale(1); }
}

@media (max-width: 960px) {
  .hero,
  .layout,
  .chat-layout { grid-template-columns: 1fr; }
  .entry-grid,
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .side-nav { position: static; display: flex; gap: 8px; overflow-x: auto; }
  .side-nav a { white-space: nowrap; }
}
@media (max-width: 720px) {
  .app-shell { width: min(100% - 22px, 1180px); padding-top: 12px; }
  .topbar { border-radius: 24px; align-items: flex-start; flex-direction: column; }
  .nav-links {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    justify-content: flex-start;
    padding-bottom: 2px;
  }
  .nav-links a { flex: 0 0 auto; }
  .growth-bar,
  .entry-grid,
  .card-grid,
  .choice-grid,
  .copy-zones { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 24px; }
  .hero-visual { min-height: 340px; }
  .demo-window { left: 28px; right: 28px; bottom: 28px; }
  .message { max-width: 94%; }
  .chat-input { flex-direction: column; }
  .chat-input .btn { width: 100%; }
  .char-box { width: 64px; height: 64px; font-size: 1.7rem; }
  .reading-section { padding: 20px; }
}
@media print {
  body { background: #fff; color: #111; }
  .topbar, .growth-panel, .action-row, .footer-tip, .chat-input { display: none !important; }
  .app-shell { width: 100%; padding: 0; }
  .page-card, .copybook-card { box-shadow: none; border-color: #c8a75e; background: #fffdf6; color: #111; }
  .copybook-card h2, .page-title { color: #8a5a12; }
  .char-box { color: #7b1118; border-color: #b99a56; }
}