/* ═══════════════════════════════════════════════════════════════════════════
   หวยสถิติ — Mobile-first Thai UI
   Design tokens → Reset → Layout → Components → Utilities
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  /* Colors — Thai-inspired, warm, high-contrast */
  --color-bg:          #FBF7F2;
  --color-surface:     #FFFFFF;
  --color-surface-2:   #F5EEE3;
  --color-text:        #1A0F0C;
  --color-text-muted:  #6B5E54;
  --color-border:      #E5D9C9;
  --color-primary:     #8B1538;       /* ครุยราชการเข้ม */
  --color-primary-ink: #FDF6E3;
  --color-accent:      #D4A04E;       /* ทอง */
  --color-hot:         #D93438;
  --color-cold:        #2E7BB8;
  --color-success:     #2D7D5F;
  --color-warn:        #B8721C;

  /* Type */
  --font-sans: "Noto Sans Thai", "Sarabun", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;
  --fs-xs:    0.75rem;
  --fs-sm:    0.875rem;
  --fs-base:  1rem;
  --fs-lg:    1.125rem;
  --fs-xl:    1.375rem;
  --fs-2xl:   1.75rem;
  --fs-3xl:   2.25rem;
  --fs-display: clamp(2.5rem, 10vw, 4.5rem);

  /* Spacing */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.25rem;
  --s-6: 1.5rem;
  --s-8: 2rem;
  --s-10: 2.5rem;
  --s-12: 3rem;
  --s-16: 4rem;

  /* Radii + shadows */
  --r-sm: 0.5rem;
  --r-md: 0.875rem;
  --r-lg: 1.25rem;
  --shadow-sm: 0 1px 2px rgba(26,15,12,.06), 0 1px 3px rgba(26,15,12,.04);
  --shadow-md: 0 4px 12px rgba(26,15,12,.08), 0 2px 4px rgba(26,15,12,.04);
  --shadow-lg: 0 14px 32px rgba(139,21,56,.14), 0 4px 8px rgba(26,15,12,.06);

  /* Motion */
  --dur: 180ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  /* Layout */
  --container: 72rem;
  --header-h: 3.5rem;
  --touch: 2.75rem;     /* 44px minimum — iOS HIG */
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:         #12100F;
    --color-surface:    #1C1916;
    --color-surface-2:  #27221D;
    --color-text:       #F4ECE1;
    --color-text-muted: #AFA194;
    --color-border:     #3A332C;
    --color-primary:    #D4426B;
    --color-primary-ink:#1A0F0C;
    --color-accent:     #E6B965;
    --shadow-md: 0 4px 12px rgba(0,0,0,.4), 0 2px 4px rgba(0,0,0,.3);
    --shadow-lg: 0 14px 32px rgba(0,0,0,.5), 0 4px 8px rgba(0,0,0,.3);
  }
}

/* ────────── Reset ────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; margin: 0 0 var(--s-3); }
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p  { margin: 0 0 var(--s-3); }
a  { color: var(--color-primary); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }
button { font: inherit; cursor: pointer; }
input, select { font: inherit; color: inherit; }
img, svg { max-width: 100%; display: block; }

/* ────────── Skip link / a11y ────────── */
.skip-link {
  position: absolute;
  left: var(--s-2); top: var(--s-2);
  padding: var(--s-2) var(--s-3);
  background: var(--color-primary); color: var(--color-primary-ink);
  border-radius: var(--r-sm);
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
  z-index: 100;
}
.skip-link:focus-visible { transform: translateY(0); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* ────────── Layout primitives ────────── */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: var(--s-4);
}
main { flex: 1; padding-bottom: var(--s-12); }

/* ────────── Header / nav ────────── */
.app-header {
  position: sticky;
  top: 0; z-index: 50;
  background: rgba(251,247,242,0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}
@media (prefers-color-scheme: dark) {
  .app-header { background: rgba(18,16,15,0.85); }
}
.header-row {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-4);
}
.brand {
  display: inline-flex; align-items: center; gap: var(--s-2);
  color: var(--color-text); font-weight: 700; font-size: var(--fs-lg);
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 2.25rem; height: 2.25rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-primary-ink);
  font-weight: 700;
}
.nav {
  display: none;
  position: absolute;
  top: var(--header-h); left: 0; right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--s-3) var(--s-4);
  flex-direction: column; gap: var(--s-1);
  box-shadow: var(--shadow-md);
}
.nav.open { display: flex; }
.nav-link {
  color: var(--color-text);
  padding: var(--s-3);
  border-radius: var(--r-sm);
  min-height: var(--touch);
  display: flex; align-items: center;
  font-weight: 500;
}
.nav-link:hover { background: var(--color-surface-2); text-decoration: none; }
.nav-link.active { color: var(--color-primary); font-weight: 600; background: var(--color-surface-2); }

.nav-toggle {
  background: transparent; border: 0;
  width: var(--touch); height: var(--touch);
  display: inline-grid; place-items: center; gap: 4px;
  border-radius: var(--r-sm);
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (min-width: 720px) {
  .nav-toggle { display: none; }
  .nav {
    display: flex !important;
    position: static; flex-direction: row; gap: var(--s-2);
    background: transparent; border: 0; box-shadow: none;
    padding: 0;
  }
  .nav-link { padding: var(--s-2) var(--s-3); }
}

/* ────────── Hero / latest ────────── */
.hero { padding-block: var(--s-8) var(--s-6); }
.eyebrow {
  text-transform: none;
  color: var(--color-text-muted);
  font-size: var(--fs-sm); font-weight: 600;
  margin-bottom: var(--s-2);
}
.hero-title { font-size: var(--fs-2xl); margin-bottom: var(--s-6); }

.prize-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
}
@media (min-width: 560px) {
  .prize-grid { grid-template-columns: repeat(2, 1fr); }
  .prize-first { grid-column: 1 / -1; }
}
@media (min-width: 960px) {
  .prize-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .prize-first { grid-column: auto; grid-row: span 1; }
}
.prize-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; justify-content: center;
  min-height: 8rem;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.prize-card:hover { box-shadow: var(--shadow-md); }
.prize-first {
  background: linear-gradient(135deg, var(--color-primary), #6B0F28);
  color: var(--color-primary-ink);
  border-color: transparent;
}
.prize-first .prize-label { color: rgba(255,255,255,0.85); }
.prize-label {
  font-size: var(--fs-sm); color: var(--color-text-muted);
  font-weight: 600; margin: 0 0 var(--s-2);
}
.prize-number {
  font-family: var(--font-mono);
  font-size: var(--fs-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}
.prize-number.small { font-size: clamp(1.75rem, 7vw, 2.75rem); }

.source-note {
  margin-top: var(--s-4);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

/* ────────── CTA / next-draw ────────── */
.cta-section { padding-block: var(--s-4); }
.next-draw-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  display: flex; flex-direction: column; gap: var(--s-4);
  box-shadow: var(--shadow-sm);
}
@media (min-width: 560px) {
  .next-draw-card { flex-direction: row; align-items: center; justify-content: space-between; }
}
.next-draw-card h2 { font-size: var(--fs-xl); margin: 0; }
.countdown {
  margin: var(--s-1) 0 0;
  color: var(--color-primary);
  font-weight: 600; font-variant-numeric: tabular-nums;
}

/* ────────── Buttons ────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--touch);
  padding: var(--s-3) var(--s-5);
  border-radius: var(--r-md);
  border: 1px solid transparent;
  font-weight: 600; font-size: var(--fs-base);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), background var(--dur), color var(--dur);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn-primary:hover { background: #721128; }
.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { background: var(--color-border); }

/* ────────── Features ────────── */
.feature-section { padding-block: var(--s-6); }
.section-title { font-size: var(--fs-xl); margin-bottom: var(--s-4); }
.feature-grid {
  display: grid; grid-template-columns: 1fr;
  gap: var(--s-3);
}
@media (min-width: 640px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .feature-grid { grid-template-columns: repeat(4, 1fr); }
}
.feature-card {
  position: relative;
  display: block;
  padding: var(--s-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  color: var(--color-text);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur);
  min-height: var(--touch);
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  text-decoration: none;
}
.feature-card h3 { margin-bottom: var(--s-2); color: var(--color-text); }
.feature-card p { color: var(--color-text-muted); font-size: var(--fs-sm); margin: 0; }
.feature-arrow {
  position: absolute; top: var(--s-4); right: var(--s-4);
  color: var(--color-primary); font-size: 1.25rem;
  transition: transform var(--dur) var(--ease);
}
.feature-card:hover .feature-arrow { transform: translateX(4px); }

/* ────────── Meta row ────────── */
.meta-section { padding-block: var(--s-6); }
.meta-row {
  display: grid; grid-template-columns: repeat(3, 1fr);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.meta-stat { padding: var(--s-4); text-align: center; border-right: 1px solid var(--color-border); }
.meta-stat:last-child { border-right: 0; }
.meta-label { color: var(--color-text-muted); font-size: var(--fs-sm); margin: 0 0 var(--s-1); }
.meta-value { font-size: var(--fs-lg); font-weight: 700; margin: 0; font-variant-numeric: tabular-nums; }

/* ────────── Page head ────────── */
.page-head { padding-block: var(--s-6) var(--s-3); }
.page-head h1 { font-size: var(--fs-3xl); }
.lede { color: var(--color-text-muted); max-width: 48rem; }

/* ────────── Draws list ────────── */
.filter-bar {
  display: flex; gap: var(--s-3); flex-wrap: wrap;
  align-items: center; margin: var(--s-4) 0;
}
.select {
  min-height: var(--touch);
  padding: 0 var(--s-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  color: var(--color-text);
}
.draw-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: 1fr; gap: var(--s-3);
}
@media (min-width: 640px) { .draw-list { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .draw-list { grid-template-columns: repeat(3, 1fr); } }
.draw-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--s-4);
  box-shadow: var(--shadow-sm);
}
.draw-card time {
  font-weight: 600; color: var(--color-primary);
  display: block; margin-bottom: var(--s-3);
}
.draw-row { display: flex; justify-content: space-between; padding: var(--s-1) 0; font-size: var(--fs-sm); }
.draw-row-label { color: var(--color-text-muted); }
.draw-row-value { font-family: var(--font-mono); font-weight: 600; font-variant-numeric: tabular-nums; }

.draw-skeleton, .rank-skeleton {
  padding: var(--s-4);
  background: var(--color-surface-2);
  border-radius: var(--r-md);
  color: var(--color-text-muted);
  text-align: center;
}

/* ────────── Segment control ────────── */
.segment {
  display: flex; gap: 2px;
  background: var(--color-surface-2);
  padding: 4px;
  border-radius: var(--r-md);
  margin: var(--s-4) 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.segment::-webkit-scrollbar { display: none; }
.segment-item {
  flex: 1 0 auto;
  min-height: var(--touch);
  padding: 0 var(--s-4);
  background: transparent; border: 0;
  border-radius: calc(var(--r-md) - 4px);
  color: var(--color-text-muted);
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--dur), color var(--dur);
}
.segment-item.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

/* ────────── Window slider ────────── */
.window-control {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center; gap: var(--s-3);
  padding: var(--s-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  margin: var(--s-4) 0;
}
.window-control input[type="range"] {
  width: 100%; accent-color: var(--color-primary);
  min-height: var(--touch);
}
.window-control output {
  font-family: var(--font-mono); font-weight: 700;
  min-width: 2.5rem; text-align: right;
}

/* ────────── Chips (hot/cold) ────────── */
.stats-section { margin-block: var(--s-6); }
.chip-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(4.5rem, 1fr));
  gap: var(--s-2);
}
.chip {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: var(--s-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  min-height: var(--touch);
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.chip--hot { background: linear-gradient(180deg, #FFE8E8, var(--color-surface)); border-color: #F6C9C9; }
.chip--cold { background: linear-gradient(180deg, #E3EFFA, var(--color-surface)); border-color: #C6DCEF; }
@media (prefers-color-scheme: dark) {
  .chip--hot { background: linear-gradient(180deg, #3A1616, var(--color-surface)); }
  .chip--cold { background: linear-gradient(180deg, #162838, var(--color-surface)); }
}
.chip-num { font-size: var(--fs-xl); letter-spacing: 0.06em; }
.chip-count { font-size: var(--fs-xs); color: var(--color-text-muted); margin-top: 2px; }
.skeleton-chip { background: var(--color-surface-2); border-radius: var(--r-md); height: 3.75rem; }

/* ────────── Digit heatmap ────────── */
.digit-heatmap {
  display: grid; gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  overflow: hidden;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.heatmap-row {
  display: grid; grid-template-columns: auto repeat(10, 1fr);
  gap: 2px; background: var(--color-border);
}
.heatmap-label {
  background: var(--color-surface); padding: var(--s-2);
  font-size: var(--fs-xs); color: var(--color-text-muted);
  text-align: center; font-weight: 600;
}
.heatmap-cell {
  background: var(--color-surface);
  padding: var(--s-2) var(--s-1);
  text-align: center; font-weight: 600;
  transition: background var(--dur);
}

/* ────────── Prediction ranks ────────── */
.rank-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: 1fr; gap: var(--s-2);
}
@media (min-width: 560px) {
  .rank-list { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .rank-list { grid-template-columns: repeat(5, 1fr); }
}
.rank-item {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--s-4);
  display: flex; flex-direction: column; gap: var(--s-1);
  overflow: hidden;
}
.rank-item::before {
  content: "";
  position: absolute; inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform-origin: left;
  transform: scaleX(var(--score, 0));
}
.rank-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.75rem; height: 1.75rem;
  border-radius: 50%;
  background: var(--color-primary); color: var(--color-primary-ink);
  font-weight: 700; font-size: var(--fs-sm);
}
.rank-number {
  font-family: var(--font-mono);
  font-size: var(--fs-3xl);
  font-weight: 700;
  letter-spacing: 0.06em;
  margin: 0;
  font-variant-numeric: tabular-nums;
}
.rank-score {
  font-size: var(--fs-sm); color: var(--color-text-muted);
}
.rank-reason {
  font-size: var(--fs-xs); color: var(--color-text-muted); margin-top: var(--s-1);
}

/* ────────── Model breakdown ────────── */
.model-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--s-4);
  margin-top: var(--s-3);
}
@media (min-width: 720px) { .model-grid { grid-template-columns: repeat(2, 1fr); } }
.model-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--s-4);
}
.model-card h3 { font-size: var(--fs-base); color: var(--color-primary); margin-bottom: var(--s-3); }
.model-nums {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(4rem, 1fr));
  gap: var(--s-2); list-style: none; padding: 0; margin: 0;
}
.model-num {
  padding: var(--s-2);
  background: var(--color-surface-2);
  border-radius: var(--r-sm);
  font-family: var(--font-mono); font-weight: 700;
  text-align: center; font-variant-numeric: tabular-nums;
}

/* ────────── Callout / disclaimer ────────── */
.callout {
  padding: var(--s-4);
  border-radius: var(--r-md);
  margin: var(--s-4) 0;
  border-left: 4px solid var(--color-warn);
  background: #FFF6E8;
  color: #5A3B0E;
}
.callout-warn { border-left-color: var(--color-warn); background: #FFF6E8; color: #5A3B0E; }
@media (prefers-color-scheme: dark) {
  .callout-warn { background: #2C1F10; color: #E6B965; }
}
.disclaimer {
  padding: var(--s-4);
  margin: var(--s-8) 0 0;
  background: var(--color-surface-2);
  border-radius: var(--r-md);
  font-size: var(--fs-sm); color: var(--color-text-muted);
}
.disclaimer strong { color: var(--color-text); }

/* ────────── Footer ────────── */
.app-footer {
  margin-top: auto;
  padding: var(--s-6) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  text-align: center;
}
.footer-note { font-size: var(--fs-xs); margin-top: var(--s-1); }

/* ────────── Motion safe ────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}