/* ═══════════════════════════════════════════════════════════
   AJARN.KWAN · SELF-LEARNING CENTRE
   theme.css — Shared design tokens + components
   
   ใช้กับทุกหน้าของเว็บไซต์ ajarnkwan.github.io
   เพื่อให้ขอบบน-ขอบล่าง + sense of brand เป็นเดียวกัน
   เนื้อหาตรงกลางแต่ละหน้า customize สีของตัวเองได้
   ═══════════════════════════════════════════════════════════ */

/* ─── FONTS ──────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=Bai+Jamjuree:wght@400;500;600;700&family=Noto+Sans+Thai:wght@300;400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

/* ─── DESIGN TOKENS ──────────────────────────────────────── */
:root {
  /* Brand palette */
  --ak-bg: #F2EBDD;
  --ak-bg-soft: #EDE5D3;
  --ak-ink: #0E0D0B;
  --ak-ink-mute: #5C544A;
  --ak-ink-soft: #8A8074;
  --ak-accent: #C2A878;
  --ak-accent-soft: #DECDA9;
  --ak-line-soft: rgba(14,13,11,0.12);

  /* Course accent palette (use sparingly per page) */
  --ak-c1: #4759AA;   /* Economics — deep blue */
  --ak-c2: #D9CAA8;   /* Econ English — sand beige */
  --ak-c3: #5E8A66;   /* Personal Finance — sage green */
  --ak-c4: #E8C75A;   /* AI Literacy — warm gold */

  /* Type scale */
  --ak-font-display: 'Archivo Black', sans-serif;
  --ak-font-th-display: 'Bai Jamjuree', sans-serif;
  --ak-font-body: 'Noto Sans Thai', system-ui, sans-serif;
  --ak-font-mono: 'Space Mono', monospace;

  /* Spacing */
  --ak-radius: 12px;
  --ak-radius-lg: 18px;
}

/* ─── BASE (use sparingly — page-specific styles override) ─ */
.ak-themed {
  background: var(--ak-bg);
  color: var(--ak-ink);
  font-family: var(--ak-font-body);
  -webkit-font-smoothing: antialiased;
}
.ak-themed ::selection { background: var(--ak-ink); color: var(--ak-bg); }

/* ─── TOP BAR (shared header) ────────────────────────────── */
.ak-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--ak-bg);
  padding: 16px 0;
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}
.ak-topbar.scrolled {
  border-bottom-color: var(--ak-line-soft);
  box-shadow: 0 2px 12px -8px rgba(0,0,0,0.06);
}
.ak-topbar-inner {
  max-width: var(--ak-content-width, 1100px);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.ak-brand {
  font-family: var(--ak-font-display);
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--ak-ink);
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 4px;
  flex-shrink: 0;
}
.ak-brand .ak-brand-dot {
  color: var(--ak-accent);
  font-size: 28px;
  line-height: 0;
}
.ak-brand:hover { opacity: 0.85; }

.ak-breadcrumb {
  font-family: var(--ak-font-mono);
  font-size: 14.5px;
  letter-spacing: 0.12em;
  color: var(--ak-ink-soft);
  text-transform: uppercase;
  display: flex;
  gap: 8px;
  align-items: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  justify-content: center;
}
.ak-breadcrumb a {
  color: inherit;
  text-decoration: none;
  transition: color .2s;
}
.ak-breadcrumb a:hover { color: var(--ak-ink); }
.ak-breadcrumb .sep { opacity: 0.4; }

.ak-topbar-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

/* Member status pill — shown when logged in (set by JS that reads localStorage) */
.ak-member-pill {
  display: none;  /* JS will toggle to inline-flex when logged in */
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  background: white;
  border: 1px solid var(--ak-line-soft);
  border-radius: 999px;
  text-decoration: none;
  color: var(--ak-ink);
  font-size: 13.5px;
  font-weight: 500;
  font-family: inherit;
  transition: all .2s;
}
.ak-member-pill:hover {
  border-color: var(--ak-ink);
  transform: translateY(-1px);
}
.ak-member-pill .ak-pill-avatar {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--ak-accent);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  font-family: 'Bai Jamjuree', sans-serif;
  flex-shrink: 0;
}
.ak-member-pill .ak-pill-label {
  font-family: 'Bai Jamjuree', sans-serif;
  font-weight: 600;
}
.ak-member-pill.is-admin .ak-pill-avatar {
  background: var(--ak-ink);
}
.ak-member-pill .ak-pill-arrow {
  font-family: 'Space Mono', monospace;
  color: var(--ak-accent);
  font-size: 12px;
  font-weight: 700;
}
@media (max-width: 540px) {
  .ak-member-pill .ak-pill-label { display: none; }
}

/* ─── BUTTONS ────────────────────────────────────────────── */
.ak-btn {
  font-family: var(--ak-font-body);
  font-size: 16px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform .2s, background .2s, color .2s, border-color .2s;
  white-space: nowrap;
}
.ak-btn:hover { transform: translateY(-1px); }

.ak-btn-primary {
  background: var(--ak-ink);
  color: var(--ak-bg);
  border-color: var(--ak-ink);
}
.ak-btn-ghost {
  background: transparent;
  color: var(--ak-ink);
  border-color: var(--ak-ink);
}
.ak-btn-ghost:hover { background: var(--ak-ink); color: var(--ak-bg); }
.ak-btn-soft {
  background: white;
  color: var(--ak-ink);
  border-color: var(--ak-line-soft);
}
.ak-btn-soft:hover { border-color: var(--ak-ink); }

/* ─── FOOTER (shared) ────────────────────────────────────── */
.ak-footer {
  padding: 60px 0 40px;
  background: var(--ak-bg);
  border-top: 1px solid var(--ak-line-soft);
  margin-top: 80px;
}
.ak-footer-inner {
  max-width: var(--ak-content-width, 1100px);
  margin: 0 auto;
  padding: 0 24px;
}
.ak-footer-mark {
  font-family: var(--ak-font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  color: var(--ak-ink);
  margin-bottom: 28px;
}
.ak-footer-mark .dim { color: var(--ak-accent); }

.ak-footer-groups {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--ak-line-soft);
}
.ak-footer-group { display: flex; flex-direction: column; gap: 8px; }
.ak-footer-group-title {
  font-family: var(--ak-font-display);
  font-size: 14.5px;
  letter-spacing: 0.18em;
  color: var(--ak-ink);
  text-transform: uppercase;
  margin-bottom: 4px;
}
.ak-footer-group a {
  color: var(--ak-ink-mute);
  text-decoration: none;
  font-size: 16px;
  cursor: pointer;
  transition: color .2s;
}
.ak-footer-group a:hover { color: var(--ak-ink); }
.ak-footer-group-brand { max-width: 280px; }
.ak-footer-group-brand p {
  font-size: 16px;
  color: var(--ak-ink-mute);
  line-height: 1.6;
  margin-bottom: 10px;
}

.ak-footer-social { display: flex; gap: 8px; margin-top: 4px; }
.ak-footer-social a {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: white;
  border: 1px solid var(--ak-line-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: var(--ak-ink);
  transition: all .2s;
  text-decoration: none;
}
.ak-footer-social a:hover {
  background: var(--ak-ink);
  color: var(--ak-bg);
  border-color: var(--ak-ink);
  transform: translateY(-2px);
}
.ak-footer-social a.fs-yt:hover {
  background: #FF0000;
  border-color: #FF0000;
}

.ak-footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: end;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 15px;
  color: var(--ak-ink-mute);
  line-height: 1.6;
}
.ak-footer-meta strong { color: var(--ak-ink); display: block; font-weight: 600; margin-bottom: 4px; }
.ak-footer-meta-tag {
  font-family: var(--ak-font-mono);
  font-size: 14.5px;
  letter-spacing: 0.15em;
  color: var(--ak-ink-soft);
  text-transform: uppercase;
}

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 800px) {
  .ak-breadcrumb { display: none; }
  .ak-footer-groups { grid-template-columns: 1fr 1fr; }
  .ak-footer-group-brand { grid-column: 1 / -1; max-width: 100%; }
}
@media (max-width: 540px) {
  .ak-topbar-inner { padding: 0 16px; gap: 8px; }
  .ak-btn { padding: 8px 14px; font-size: 16px; }
  .ak-footer-inner { padding: 0 20px; }
  .ak-footer-groups { grid-template-columns: 1fr; gap: 24px; }
  .ak-footer-meta { flex-direction: column; align-items: flex-start; }
}


/* ─── CONTENT WIDTH OVERRIDE ─────────────────────────────── */
/* Force content containers to match topbar/footer width
   ทำให้เนื้อหาภายในกว้างเท่ากับขอบบน-ล่างเสมอ ไม่มี seam */
body[style*="--ak-content-width"] > .container,
body[style*="--ak-content-width"] .container,
body[style*="--ak-content-width"] .page,
body[style*="--ak-content-width"] .topbar,
body[style*="--ak-content-width"] header.topbar,
body[style*="--ak-content-width"] .land-bar,
body[style*="--ak-content-width"] header.ajk-topbar,
body[style*="--ak-content-width"] .ajk-topbar-inner,
body[style*="--ak-content-width"] .ajk-footer-inner,
body[style*="--ak-content-width"] main,
body[style*="--ak-content-width"] > footer:not(.ak-footer) {
  max-width: var(--ak-content-width) !important;
  margin-left: auto !important;
  margin-right: auto !important;
}

/* ─── THEME VARIANTS ─────────────────────────────────────── */
/* Each section has its own bg + content-width. 
   Inline style on <body> can further override per-page (สำคัญสำหรับ microeconomics ที่ chapters มีสีหลากหลาย) */

.ak-theme-economics {
  --ak-bg: #FDF8F2;
  --ak-content-width: 920px;
}
.ak-theme-economics .ak-topbar { background: var(--ak-bg, #FDF8F2); }
.ak-theme-economics .ak-footer { background: var(--ak-bg, #FDF8F2); }

.ak-theme-econometrics {
  --ak-bg: #FFF8F0;
  --ak-content-width: 1100px;
}
.ak-theme-econometrics .ak-topbar { background: var(--ak-bg, #FFF8F0); }
.ak-theme-econometrics .ak-footer { background: var(--ak-bg, #FFF8F0); }

.ak-theme-econ-math-readiness {
  --ak-bg: #FAF9F6;
  --ak-content-width: 1100px;
}
.ak-theme-econ-math-readiness .ak-topbar { background: var(--ak-bg, #FAF9F6); }
.ak-theme-econ-math-readiness .ak-footer { background: var(--ak-bg, #FAF9F6); }

.ak-theme-microeconomics {
  --ak-bg: #F6F7FF;
  --ak-content-width: 780px;
}
.ak-theme-microeconomics .ak-topbar { background: var(--ak-bg, #F6F7FF); }
.ak-theme-microeconomics .ak-footer { background: var(--ak-bg, #F6F7FF); }

.ak-theme-vibe-coding {
  --ak-bg: #FDF8F2;
  --ak-content-width: 760px;
}
.ak-theme-vibe-coding .ak-topbar { background: var(--ak-bg, #FDF8F2); }
.ak-theme-vibe-coding .ak-footer { background: var(--ak-bg, #FDF8F2); }

.ak-theme-vocab {
  --ak-bg: #FFF8EA;
  --ak-content-width: 1100px;
}
.ak-theme-vocab .ak-topbar { background: var(--ak-bg, #FFF8EA); }
.ak-theme-vocab .ak-footer { background: var(--ak-bg, #FFF8EA); }