/* ────────────────────────────────────────────────────────────
   Memento Landing — Warm Paper + Ink design system
   颜色 / 字体 / 间距全部对齐 app/lib/core/theme/app_*.dart
   ────────────────────────────────────────────────────────────*/

:root {
  /* Paper（暖纸背景三阶）*/
  --paper:        #F5EFE4;
  --paperSoft:    #EDE6D6;
  --paperDeep:    #E4DAC4;
  --paperEdge:    rgba(90, 70, 40, 0.08);

  /* Ink（暖墨文字三阶）*/
  --ink:          #2B261E;
  --inkMid:       #5C5346;
  --inkSoft:      #8A7F6E;
  --inkWash:      rgba(43, 38, 30, 0.08);

  /* Accents */
  --accentTerracotta: #BA7846;
  --accentFawn:       #CBA27F;
  --accentRose:       #D0876F;
  --accentSage:       #7A9E7E;
  --accentIndigo:     #5B6AA5;
  --accentOchre:      #C9A258;

  /* Semantic */
  --success: #6E9173;
  --warning: #C9A258;

  /* Layout */
  --maxWidth: 1140px;
  --gutter: 24px;
  --radius-sm: 8px;
  --radius:    12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  /* Shadow */
  --shadow-soft:  0 1px 2px var(--paperEdge), 0 0 0 1px var(--paperEdge);
  --shadow-card:  0 2px 12px rgba(43, 38, 30, 0.06), 0 0 0 1px var(--paperEdge);
  --shadow-hover: 0 8px 24px rgba(43, 38, 30, 0.10), 0 0 0 1px var(--paperEdge);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* ─── Fade-up scroll animation ────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .7s ease-out, transform .7s ease-out;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .fade-up { opacity: 1; transform: none; transition: none; }
}

/* ─── Nav scroll state ────────────────────────────── */
.nav.scrolled {
  box-shadow: 0 1px 8px rgba(43, 38, 30, 0.06);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Noto Sans SC', 'PingFang TC', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

p { margin: 0 0 1em; }

strong { color: var(--ink); font-weight: 600; }

.container {
  width: 100%;
  max-width: var(--maxWidth);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.ink-soft { color: var(--inkSoft); }

/* ─── Nav ─────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 239, 228, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--paperEdge);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: var(--ink); color: var(--paper);
  border-radius: var(--radius-sm);
  font-family: 'Noto Serif SC', serif;
  font-weight: 700; font-size: 18px;
}
.brand-text {
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.02em;
}
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; }
.nav-links a {
  color: var(--inkMid);
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--ink); }

.btn-cta-small {
  background: var(--ink) !important;
  color: var(--paper) !important;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-weight: 500;
}

/* ─── Hero ───────────────────────────────────────── */
.hero {
  position: relative;
  padding: 96px 0 120px;
  background: linear-gradient(180deg, var(--paper) 0%, #F0E8D6 100%);
  overflow: hidden;
}
.hero-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--accentIndigo);
  text-transform: uppercase;
  font-weight: 500;
  margin: 0 0 20px;
}
.hero-title {
  font-family: 'Noto Serif SC', 'Noto Sans SC', serif;
  font-size: clamp(48px, 8vw, 88px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  color: var(--ink);
}
.hero-lead {
  max-width: 640px;
  font-size: 18px;
  color: var(--inkMid);
  line-height: 1.7;
  margin: 0 0 36px;
}
.hero-cta { display: flex; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.hero-meta {
  font-size: 13px;
  color: var(--inkSoft);
  margin: 0;
}
.hero-paper-edge {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: var(--paperEdge);
}

/* ─── Buttons ────────────────────────────────────── */
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  font-weight: 500;
  font-size: 15px;
  transition: all .2s ease;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover {
  background: #1C1813;
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(43, 38, 30, 0.15);
}
.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--paperEdge);
}
.btn-secondary:hover {
  background: var(--paperSoft);
  border-color: var(--inkSoft);
}

/* ─── Section base ──────────────────────────────── */
.section {
  padding: 96px 0;
  position: relative;
}
.section-soft {
  background: var(--paperSoft);
}
.section-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--ink);
  text-align: center;
}
.section-lead {
  max-width: 720px;
  margin: 0 auto 56px;
  text-align: center;
  font-size: 17px;
  color: var(--inkMid);
  line-height: 1.7;
}
.kicker {
  text-align: center;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accentIndigo);
  text-transform: uppercase;
  font-weight: 500;
  margin: 0 0 16px;
}

/* ─── Pillars ───────────────────────────────────── */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 56px;
}
.pillar {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: all .2s ease;
}
.pillar:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.pillar-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink);
  margin-bottom: 20px;
}
.pillar h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--ink);
}
.pillar p {
  font-size: 15px;
  color: var(--inkMid);
  line-height: 1.7;
  margin: 0;
}

/* ─── Kin ───────────────────────────────────────── */
.kin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin: 24px 0 56px;
  max-width: 840px;
  margin-left: auto; margin-right: auto;
}
.kin-card {
  display: flex; flex-direction: column; align-items: center;
  padding: 32px 20px;
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-card);
  transition: transform .2s ease;
}
.kin-card:hover { transform: translateY(-4px) scale(1.02); }
.kin-tuantuan { background: linear-gradient(160deg, var(--paper) 0%, #F0F0E8 100%); }
.kin-bengbeng { background: linear-gradient(160deg, var(--paper) 0%, #F5EBE3 100%); }
.kin-afu      { background: linear-gradient(160deg, var(--paper) 0%, #F0E5D8 100%); }
.kin-xiaolu   { background: linear-gradient(160deg, var(--paper) 0%, #F5DFC8 100%); }
.kin-emoji {
  font-size: 64px;
  line-height: 1;
  margin-bottom: 16px;
}
.kin-lottie {
  width: 110px;
  height: 110px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.kin-lottie svg {
  width: 100% !important;
  height: 100% !important;
}
.kin-name {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}
.kin-desc {
  font-size: 13px;
  color: var(--inkSoft);
  letter-spacing: 0.04em;
}
.kin-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px 48px;
  margin-top: 64px;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}
@media (max-width: 720px) {
  .kin-features { grid-template-columns: 1fr; gap: 28px; }
}
.kin-feature {
  padding: 0;
}
.kin-feature strong {
  display: block;
  font-family: 'Noto Serif SC', serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}
.kin-feature p {
  font-size: 15px;
  color: var(--inkMid);
  line-height: 1.7;
  margin: 0;
}
.kin-feature p strong {
  display: inline; /* 防止句中 strong 引起换行错乱 */
  font-size: inherit;
  font-family: inherit;
  margin: 0;
}

/* ─── Voice ─────────────────────────────────────── */
.voice-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
  margin-top: 56px;
}
@media (max-width: 900px) {
  .voice-grid { grid-template-columns: 1fr; }
}
.voice-card {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
}
.voice-card-primary {
  background: linear-gradient(160deg, #F5EFE4 0%, #EDE0CC 100%);
  border: 1px solid var(--accentOchre);
}
.voice-card-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--accentIndigo);
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 14px;
}
.voice-card-primary .voice-card-label { color: var(--accentTerracotta); }
.voice-card h3 {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  margin: 0 0 16px;
}
.voice-card-primary h3 {
  font-size: 26px;
}
.voice-card p {
  font-size: 15px;
  color: var(--inkMid);
  line-height: 1.7;
  margin: 0;
}

/* ─── Guardian flow ─────────────────────────────── */
.guardian-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 16px;
  align-items: stretch;
  margin: 56px 0 32px;
}
@media (max-width: 900px) {
  .guardian-flow {
    grid-template-columns: 1fr;
  }
  .guardian-arrow { display: none; }
}
.guardian-step {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
}
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-pill);
  font-weight: 600;
  margin-bottom: 12px;
}
.guardian-step h4 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--ink);
}
.guardian-step p {
  font-size: 14px;
  color: var(--inkMid);
  line-height: 1.6;
  margin: 0;
}
.guardian-arrow {
  display: flex;
  align-items: center;
  color: var(--inkSoft);
  font-size: 24px;
  font-weight: 300;
}
.guardian-note {
  text-align: center;
  font-size: 14px;
  color: var(--inkSoft);
  max-width: 720px;
  margin: 0 auto;
  font-style: italic;
}

/* ─── Vault examples ────────────────────────────── */
.vault-examples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 56px;
}
.vault-card {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
}
.vault-icon { font-size: 40px; margin-bottom: 16px; line-height: 1; }
.vault-card h4 {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--ink);
}
.vault-card p {
  font-size: 15px;
  color: var(--inkMid);
  line-height: 1.7;
  margin: 0;
}
.vault-meta {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--inkSoft);
  font-style: italic;
}

/* ─── Pricing ───────────────────────────────────── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 56px;
}
.pricing-card {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-card);
  display: flex; flex-direction: column;
  position: relative;
}
.pricing-featured {
  background: linear-gradient(180deg, var(--paper) 0%, #F0E8D6 100%);
  border: 2px solid var(--ink);
  transform: scale(1.02);
}
.pricing-lifetime {
  background: linear-gradient(180deg, #F5EAD0 0%, #ECDFB5 100%);
  border: 1px solid var(--accentOchre);
}
.plan-badge {
  position: absolute;
  top: -10px; left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}
.plan-badge-gold {
  background: var(--accentOchre);
  color: var(--ink);
}
.plan-name {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
.plan-price { margin-bottom: 4px; }
.price-amount {
  font-family: 'Inter', sans-serif;
  font-size: 36px;
  font-weight: 600;
  color: var(--ink);
}
.price-period {
  font-size: 14px;
  color: var(--inkSoft);
  margin-left: 4px;
}
.plan-desc {
  font-size: 14px;
  color: var(--inkSoft);
  margin-bottom: 24px;
}
.plan-features {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  flex: 1;
}
.plan-features li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--inkMid);
  line-height: 1.5;
}
.plan-features li::before {
  content: "·";
  position: absolute;
  left: 6px;
  top: -2px;
  color: var(--accentSage);
  font-weight: 700;
  font-size: 18px;
}
.plan-features li strong { color: var(--ink); }
.plan-cta { width: 100%; }

/* ─── FAQ ───────────────────────────────────────── */
.faq {
  max-width: 760px;
  margin: 56px auto 0;
}
.faq details {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
}
.faq summary {
  font-weight: 600;
  font-size: 16px;
  color: var(--ink);
  list-style: none;
  position: relative;
  padding-right: 24px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0; top: -2px;
  font-size: 22px;
  color: var(--inkSoft);
  font-weight: 300;
  transition: transform .2s ease;
}
.faq details[open] summary::after { content: "−"; }
.faq details p {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--inkMid);
  line-height: 1.7;
}

/* ─── CTA section ───────────────────────────────── */
.section-cta {
  background: linear-gradient(180deg, var(--paperSoft) 0%, var(--paperDeep) 100%);
}
.store-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: 32px 0 24px;
}
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  transition: all .2s ease;
  min-width: 200px;
}
.store-btn:hover {
  background: #1C1813;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(43, 38, 30, 0.2);
}
.store-btn-text { display: flex; flex-direction: column; line-height: 1.2; }
.store-btn-small { font-size: 11px; opacity: 0.85; }
.store-btn-big { font-size: 18px; font-weight: 600; }
.cta-trust {
  text-align: center;
  font-size: 14px;
  color: var(--inkSoft);
  margin: 0;
}

/* ─── Footer ────────────────────────────────────── */
.footer {
  background: var(--paperDeep);
  padding: 56px 0 32px;
  border-top: 1px solid var(--paperEdge);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 48px;
  margin-bottom: 32px;
}
@media (max-width: 700px) {
  .footer-inner { grid-template-columns: 1fr; }
}
.footer-tagline {
  margin-top: 12px;
  font-family: 'Noto Serif SC', serif;
  font-size: 14px;
  color: var(--inkSoft);
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.footer-col h5 {
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--inkSoft);
  margin: 0 0 16px;
  font-weight: 600;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--inkMid);
  margin-bottom: 8px;
  transition: color .15s ease;
}
.footer-col a:hover { color: var(--ink); }
.footer-copyright {
  text-align: center;
  font-size: 12px;
  color: var(--inkSoft);
  padding-top: 24px;
  border-top: 1px solid var(--paperEdge);
}

/* ─── Mobile ─────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links a:not(.btn-cta-small) { display: none; }
  .section { padding: 64px 0; }
  .hero { padding: 64px 0 80px; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .hero-cta .btn-primary, .hero-cta .btn-secondary { width: 100%; }
  .pricing-featured { transform: none; }
}

/* ─── Legal pages ────────────────────────────────── */
.legal-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 96px var(--gutter) 96px;
}
.legal-page h1 {
  font-family: 'Noto Serif SC', serif;
  font-size: 36px;
  margin: 0 0 8px;
}
.legal-page .legal-meta {
  color: var(--inkSoft);
  font-size: 14px;
  margin-bottom: 32px;
}
.legal-page h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  margin: 32px 0 12px;
  color: var(--ink);
}
.legal-page h3 {
  font-size: 17px;
  margin: 24px 0 8px;
  color: var(--ink);
}
.legal-page p, .legal-page li {
  font-size: 15px;
  color: var(--inkMid);
  line-height: 1.75;
}
.legal-page a { color: var(--accentIndigo); text-decoration: underline; }
.legal-page ul { padding-left: 20px; }
.legal-page hr {
  border: none;
  border-top: 1px solid var(--paperEdge);
  margin: 48px 0;
}