:root {
  --bg: #f7f5f0;
  --bg-elevated: #ffffff;
  --bg-soft: #efece4;
  --ink: #1c1b18;
  --ink-soft: #4a4842;
  --ink-muted: #8a877e;
  --line: #e3dfd4;
  --line-soft: #ece8dd;
  --primary: #0f766e;
  --primary-soft: #14b8a6;
  --primary-tint: #e6f3f1;
  --accent: #c2410c;
  --accent-tint: #fdf0e6;
  --shadow-sm: 0 1px 2px rgba(28,27,24,0.04), 0 1px 3px rgba(28,27,24,0.06);
  --shadow-md: 0 4px 12px rgba(28,27,24,0.06), 0 2px 4px rgba(28,27,24,0.04);
  --shadow-lg: 0 20px 50px rgba(28,27,24,0.10), 0 8px 16px rgba(28,27,24,0.06);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
::selection { background: var(--primary-tint); color: var(--primary); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 10px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--ink-muted); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ===== Layout ===== */
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 245, 240, 0.82);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner { max-width: 1080px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 600; font-size: 1.15rem; color: var(--ink); letter-spacing: -0.01em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), var(--primary-soft)); color: #fff; }
.header-progress { display: flex; align-items: center; gap: 10px; }
.progress-ring { display: block; }
.progress-label { font-size: 0.82rem; font-weight: 500; color: var(--ink-soft); }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; padding: 96px 24px 80px; text-align: center; }
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-blob { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.55; }
.blob-a { width: 460px; height: 460px; background: radial-gradient(circle, #2dd4bf, transparent 70%); top: -120px; left: -80px; animation: float 9s ease-in-out infinite; }
.blob-b { width: 420px; height: 420px; background: radial-gradient(circle, #fdba74, transparent 70%); bottom: -140px; right: -60px; animation: float 11s ease-in-out infinite reverse; }
.hero-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--line-soft) 1px, transparent 1px), linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000, transparent 75%);
  opacity: 0.5;
}
.hero-inner { position: relative; z-index: 1; max-width: 760px; margin: 0 auto; animation: fadeUp 0.8s ease both; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px; border-radius: 999px; background: var(--bg-elevated); border: 1px solid var(--line); color: var(--primary); font-size: 0.84rem; font-weight: 500; box-shadow: var(--shadow-sm); margin-bottom: 28px; }
.hero-title { font-family: var(--serif); font-weight: 600; font-size: clamp(2.6rem, 6vw, 4.4rem); line-height: 1.05; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 18px; }
.hero-subtitle { font-family: var(--serif); font-style: italic; font-size: clamp(1.15rem, 2.6vw, 1.5rem); color: var(--primary); margin-bottom: 22px; }
.hero-tagline { font-size: 1.08rem; line-height: 1.65; color: var(--ink-soft); max-width: 580px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }
.hero-stat { display: flex; flex-direction: column; gap: 2px; }
.hero-stat-value { font-family: var(--serif); font-size: 2rem; font-weight: 600; color: var(--ink); }
.hero-stat-label { font-size: 0.82rem; color: var(--ink-muted); text-transform: uppercase; letter-spacing: 0.06em; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 22px; border-radius: 12px; font-weight: 600; font-size: 0.95rem; transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: #fff; box-shadow: 0 4px 14px rgba(28,27,24,0.18); }
.btn-primary:hover { background: #2a2925; box-shadow: 0 6px 20px rgba(28,27,24,0.24); }
.btn-ghost { background: transparent; color: var(--ink-soft); border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--bg-elevated); border-color: var(--ink-muted); }
.btn-read { background: var(--primary-tint); color: var(--primary); border: 1px solid var(--primary-soft); }

/* ===== Section heads ===== */
.section-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.eyebrow { display: inline-block; font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; color: var(--primary); margin-bottom: 14px; }
.section-title { font-family: var(--serif); font-weight: 600; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; letter-spacing: -0.01em; color: var(--ink); margin-bottom: 16px; }
.section-lead { font-size: 1.05rem; line-height: 1.65; color: var(--ink-soft); }
.article-section { padding: 72px 24px; }
.chapters-section { padding: 72px 24px; }
.plan-section { padding: 72px 24px 40px; }

/* ===== Article ===== */
.article-card { background: var(--bg-elevated); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 48px; box-shadow: var(--shadow-md); }
.article-intro { display: flex; gap: 18px; align-items: flex-start; padding-bottom: 36px; margin-bottom: 36px; border-bottom: 1px solid var(--line-soft); }
.article-quote { color: var(--primary); flex-shrink: 0; opacity: 0.7; }
.article-intro p { font-family: var(--serif); font-size: 1.22rem; line-height: 1.6; color: var(--ink); font-style: italic; }
.topics-list { display: flex; flex-direction: column; gap: 32px; }
.topic { display: flex; gap: 22px; align-items: flex-start; }
.topic-index { flex-shrink: 0; font-family: var(--serif); font-size: 1.6rem; font-weight: 600; color: var(--primary); width: 48px; line-height: 1; padding-top: 2px; }
.topic-title { font-family: var(--serif); font-weight: 600; font-size: 1.3rem; color: var(--ink); margin-bottom: 10px; letter-spacing: -0.01em; }
.topic-text { font-size: 1.02rem; line-height: 1.7; color: var(--ink-soft); }
.article-conclusion { display: flex; gap: 18px; align-items: flex-start; margin-top: 40px; padding: 28px; background: var(--primary-tint); border-radius: var(--radius-md); border: 1px solid #c9e6e2; }
.conclusion-mark { flex-shrink: 0; color: var(--primary); }
.article-conclusion p { font-family: var(--serif); font-size: 1.1rem; line-height: 1.65; color: var(--ink); }

/* ===== Chapter grid ===== */
.chapter-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.chapter-card { display: flex; flex-direction: column; text-align: left; padding: 26px; background: var(--bg-elevated); border: 1px solid var(--line); border-radius: var(--radius-md); transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease; animation: fadeUp 0.5s ease both; }
.chapter-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-soft); }
.chapter-card[data-read="true"] { border-color: var(--primary); background: linear-gradient(180deg, var(--primary-tint), var(--bg-elevated) 60%); }
.chapter-card-top { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.chapter-icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; background: var(--primary-tint); color: var(--primary); }
.chapter-number { font-size: 0.82rem; font-weight: 600; color: var(--ink-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.chapter-read-badge { display: inline-flex; align-items: center; gap: 4px; margin-left: auto; padding: 4px 9px; border-radius: 999px; background: var(--primary); color: #fff; font-size: 0.72rem; font-weight: 600; }
.chapter-title { font-family: var(--serif); font-weight: 600; font-size: 1.3rem; color: var(--ink); margin-bottom: 8px; letter-spacing: -0.01em; }
.chapter-subtitle { font-size: 0.95rem; line-height: 1.55; color: var(--ink-soft); margin-bottom: 22px; flex: 1; }
.chapter-card-foot { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; border-top: 1px solid var(--line-soft); }
.chapter-meta { font-size: 0.82rem; color: var(--ink-muted); }
.chapter-cta { display: inline-flex; align-items: center; gap: 6px; font-size: 0.88rem; font-weight: 600; color: var(--primary); transition: gap 0.2s ease; }
.chapter-card:hover .chapter-cta { gap: 10px; }

/* ===== Reader overlay ===== */
.reader-overlay { position: fixed; inset: 0; z-index: 100; background: var(--bg); overflow: hidden; }
.reader-overlay[hidden] { display: none; }
.reader-shell { height: 100%; display: flex; flex-direction: column; }
.reader-progress-bar { height: 3px; background: var(--line-soft); }
.reader-progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--primary-soft)); transition: width 0.1s linear; }
.reader-topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 24px; background: rgba(247,245,240,0.9); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line-soft); }
.reader-back { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: 0.92rem; color: var(--ink-soft); padding: 8px 4px; transition: color 0.2s ease; }
.reader-back:hover { color: var(--primary); }
.reader-topbar-meta { display: flex; gap: 8px; }
.reader-chip { padding: 5px 12px; border-radius: 999px; background: var(--bg-elevated); border: 1px solid var(--line); font-size: 0.8rem; font-weight: 600; color: var(--ink-soft); }
.reader-chip.muted { color: var(--ink-muted); }
.reader-scroll { flex: 1; overflow-y: auto; }
.reader-article { max-width: 720px; margin: 0 auto; padding: 56px 28px 80px; animation: fadeIn 0.4s ease both; }
.reader-header { text-align: center; margin-bottom: 40px; }
.reader-icon { display: inline-grid; place-items: center; width: 56px; height: 56px; border-radius: 16px; background: var(--primary-tint); color: var(--primary); margin-bottom: 18px; }
.reader-eyebrow { display: block; font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; color: var(--primary); margin-bottom: 12px; }
.reader-title { font-family: var(--serif); font-weight: 600; font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 14px; }
.reader-subtitle { font-family: var(--serif); font-style: italic; font-size: 1.2rem; color: var(--ink-soft); }
.reader-intro { font-family: var(--serif); font-size: 1.22rem; line-height: 1.65; color: var(--ink); margin-bottom: 44px; padding-bottom: 40px; border-bottom: 1px solid var(--line-soft); }
.reader-sections { display: flex; flex-direction: column; gap: 36px; margin-bottom: 48px; }
.reader-section-title { font-family: var(--serif); font-weight: 600; font-size: 1.4rem; color: var(--ink); margin-bottom: 12px; letter-spacing: -0.01em; }
.reader-section-body { font-size: 1.06rem; line-height: 1.75; color: var(--ink-soft); }

.exercise-block { background: var(--accent-tint); border: 1px solid #f6d5bd; border-radius: var(--radius-lg); padding: 32px; margin-bottom: 36px; }
.exercise-head { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 22px; }
.exercise-icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; background: var(--accent); color: #fff; flex-shrink: 0; }
.exercise-eyebrow { display: block; font-size: 0.74rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); margin-bottom: 4px; }
.exercise-title { font-family: var(--serif); font-weight: 600; font-size: 1.22rem; color: var(--ink); letter-spacing: -0.01em; }
.exercise-steps { display: flex; flex-direction: column; gap: 14px; }
.exercise-step { display: flex; gap: 14px; align-items: flex-start; }
.exercise-step-num { flex-shrink: 0; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--bg-elevated); border: 1px solid var(--accent); color: var(--accent); font-size: 0.82rem; font-weight: 700; }
.exercise-step-text { font-size: 1rem; line-height: 1.65; color: var(--ink-soft); padding-top: 3px; }

.reader-actions { display: flex; justify-content: center; margin-bottom: 48px; }
.reader-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding-top: 32px; border-top: 1px solid var(--line-soft); }
.reader-nav-card { display: flex; flex-direction: column; gap: 8px; padding: 18px 20px; border-radius: var(--radius-md); background: var(--bg-elevated); border: 1px solid var(--line); text-align: left; transition: border-color 0.2s ease, transform 0.2s ease; }
.reader-nav-card:hover { border-color: var(--primary-soft); transform: translateY(-2px); }
.reader-nav-next { text-align: right; }
.reader-nav-dir { display: inline-flex; align-items: center; gap: 4px; font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-muted); }
.reader-nav-title { font-family: var(--serif); font-weight: 600; font-size: 1.05rem; color: var(--ink); }

/* ===== Action plan ===== */
.plan-wrap { max-width: 1080px; margin: 0 auto; }
.plan-overview { display: flex; align-items: center; gap: 32px; padding: 32px; background: var(--bg-elevated); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); margin-bottom: 32px; }
.plan-overview-ring { position: relative; width: 120px; height: 120px; flex-shrink: 0; }
.plan-ring-svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.plan-ring-track { fill: none; stroke: var(--line); stroke-width: 10; }
.plan-ring-fill { fill: none; stroke: var(--primary); stroke-width: 10; stroke-linecap: round; stroke-dasharray: 327; transition: stroke-dashoffset 0.6s ease; }
.plan-ring-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.plan-ring-value { font-family: var(--serif); font-size: 2rem; font-weight: 600; color: var(--ink); line-height: 1; }
.plan-ring-total { font-size: 0.82rem; color: var(--ink-muted); }
.plan-overview-title { font-family: var(--serif); font-weight: 600; font-size: 1.4rem; color: var(--ink); margin-bottom: 8px; }
.plan-overview-desc { font-size: 1rem; line-height: 1.6; color: var(--ink-soft); }

.plan-filters { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.filter-chip { padding: 8px 16px; border-radius: 999px; background: var(--bg-elevated); border: 1px solid var(--line); font-size: 0.86rem; font-weight: 500; color: var(--ink-soft); transition: all 0.2s ease; }
.filter-chip:hover { border-color: var(--ink-muted); }
.filter-chip.is-active { background: var(--ink); color: #fff; border-color: var(--ink); }

.plan-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.plan-day { display: flex; flex-direction: column; gap: 8px; text-align: left; padding: 18px; background: var(--bg-elevated); border: 1px solid var(--line); border-radius: var(--radius-md); transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease; }
.plan-day:hover { border-color: var(--primary-soft); transform: translateY(-2px); }
.plan-day.is-done { background: linear-gradient(180deg, var(--primary-tint), var(--bg-elevated) 70%); border-color: var(--primary); }
.plan-day-head { display: flex; align-items: center; justify-content: space-between; }
.plan-day-num { font-family: var(--serif); font-weight: 600; font-size: 0.95rem; color: var(--ink); }
.plan-day-check { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line); color: transparent; transition: all 0.2s ease; }
.plan-day-check.is-on { background: var(--primary); border-color: var(--primary); color: #fff; }
.plan-day-theme { font-size: 0.74rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--primary); }
.plan-day-task { font-size: 0.94rem; line-height: 1.55; color: var(--ink-soft); flex: 1; }
.plan-day-chapter { font-size: 0.78rem; color: var(--ink-muted); padding-top: 8px; border-top: 1px solid var(--line-soft); }

/* ===== Footer ===== */
.site-footer { margin-top: 60px; padding: 56px 24px 40px; background: var(--bg-soft); border-top: 1px solid var(--line); }
.footer-inner { max-width: 1080px; margin: 0 auto; text-align: center; }
.footer-brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-mark { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), var(--primary-soft)); color: #fff; }
.footer-title { display: block; font-family: var(--serif); font-weight: 600; font-size: 1.1rem; color: var(--ink); }
.footer-sub { font-size: 0.82rem; color: var(--ink-muted); }
.footer-note { max-width: 560px; margin: 0 auto 18px; font-size: 0.95rem; line-height: 1.6; color: var(--ink-soft); }
.footer-credit { font-size: 0.82rem; color: var(--ink-muted); }

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .hero { padding: 64px 20px 56px; }
  .hero-stats { gap: 28px; }
  .article-card { padding: 28px 22px; }
  .article-intro { flex-direction: column; gap: 10px; }
  .topic { gap: 14px; }
  .topic-index { font-size: 1.3rem; width: 38px; }
  .reader-article { padding: 36px 22px 64px; }
  .reader-nav { grid-template-columns: 1fr; }
  .reader-nav-next { text-align: left; }
  .plan-overview { flex-direction: column; text-align: center; gap: 20px; padding: 26px; }
  .exercise-block { padding: 22px; }
  .article-section, .chapters-section, .plan-section { padding: 56px 20px; }
  .section-head { margin-bottom: 32px; }
}