/* ─── Reset & Root ─────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:root {
  --bg: #080808;
  --surface: #0f0f0f;
  --surface-2: #161616;
  --surface-3: #1c1c1c;
  --border-dim: rgba(255,255,255,0.06);
  --border-mid: rgba(255,255,255,0.09);
  --text-primary: rgba(255,255,255,0.92);
  --text-secondary: rgba(255,255,255,0.55);  /* 6.4:1 — AA ✓ */
  --text-tertiary: rgba(255,255,255,0.46);  /* 4.7:1 — AA ✓ */
  --accent: #4ade80;
  --accent-dim: rgba(74,222,128,0.12);
  --accent-glow: rgba(74,222,128,0.06);
  --mono: 'JetBrains Mono', monospace;
  --serif: 'DM Serif Display', Georgia, serif;
  --sans: 'Inter', system-ui, sans-serif;

  /* Dark-mode shadow system */
  --shadow-border: 0 0 0 1px rgba(255,255,255,0.07);
  --shadow-border-hover: 0 0 0 1px rgba(255,255,255,0.12);
  --shadow-card: 0 0 0 1px rgba(255,255,255,0.07), 0 4px 24px rgba(0,0,0,0.4);
  --shadow-card-hover: 0 0 0 1px rgba(255,255,255,0.11), 0 8px 32px rgba(0,0,0,0.5);
}

/* ─── Light mode tokens ─────────────────────────────── */
[data-theme="light"] {
  --bg: #ffffff;
  --surface: #f7f7f5;
  --surface-2: #f1f1ef;
  --surface-3: #ebebea;
  --border-dim: #e9e9e7;
  --border-mid: #d9d9d7;
  --text-primary: #37352f;
  --text-secondary: #787672;
  --text-tertiary: #a9a9a6;
  --accent: #16a34a;
  --accent-dim: rgba(22,163,74,0.10);
  --accent-glow: rgba(22,163,74,0.06);
  --shadow-border: 0 0 0 1px #e9e9e7;
  --shadow-border-hover: 0 0 0 1px #d9d9d7;
  --shadow-card: 0 0 0 1px #e9e9e7, 0 4px 24px rgba(55,53,47,0.06);
  --shadow-card-hover: 0 0 0 1px #d9d9d7, 0 8px 32px rgba(55,53,47,0.09);
}

/* Overrides for hardcoded colours that can't use variables */
[data-theme="light"] h1 em                  { color: #a9a9a6; }
[data-theme="light"] .btn-analyze:hover      { background: var(--surface-3); }
[data-theme="light"] .suggestion-item:hover  { background: var(--surface-3); }
[data-theme="light"] .footer-copy-link       { border-bottom-color: #d9d9d7; }
[data-theme="light"] .section-divider        { background: linear-gradient(to bottom, transparent, #e9e9e7, transparent); }
[data-theme="light"] .input-card          { background: var(--bg); }
[data-theme="light"] .textarea-wrap       { background: var(--bg); }
[data-theme="light"] .input-footer        { background: var(--bg); border-radius: 12px; }
[data-theme="light"] .btn-analyze         { background: var(--surface); }
[data-theme="light"] .btn-analyze:hover   { background: var(--surface-2); }
[data-theme="light"] .result-card         { background: var(--bg); }
[data-theme="light"] .card-inner          { background: var(--surface); }
[data-theme="light"] .metric-cell         { background: var(--surface); }
[data-theme="light"] .input-card:focus-within {
  box-shadow: var(--shadow-card-hover),
              0 0 0 1px rgba(22,163,74,0.25),
              0 0 40px rgba(22,163,74,0.05);
}
[data-theme="light"] .ambient::before { opacity: 0.35; }
[data-theme="light"] .ambient::after  { opacity: 0.25; }
[data-theme="light"] footer::after {
  background: radial-gradient(
    circle var(--glow-r) at 50% 78%,
    rgba(22,163,74,0.10) 0%,
    rgba(22,163,74,0.04) 40%,
    rgba(22,163,74,0.01) 65%,
    transparent 85%
  );
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--sans);
  font-weight: 400;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition-property: background-color, color;
  transition-duration: 200ms;
  transition-timing-function: ease-out;
}

/* ─── Ambient Background ───────────────────────────────── */
.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    rgba(74,222,128,0.055) 0%,
    rgba(74,222,128,0.018) 35%,
    transparent 70%
  );
  filter: blur(60px);
}

.ambient::after {
  content: '';
  position: absolute;
  top: 30%;
  left: 30%;
  width: 500px;
  height: 400px;
  background: radial-gradient(
    ellipse at center,
    rgba(56,189,248,0.025) 0%,
    transparent 65%
  );
  filter: blur(80px);
}

/* ─── Layout ────────────────────────────────────────────── */
.page {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 680px;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ─── Header ────────────────────────────────────────────── */
header {
  padding-top: 96px;
  padding-bottom: 64px;
  text-align: center;
  width: 100%;
}

.wordmark {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 32px;
  opacity: 0.8;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(36px, 6vw, 52px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  text-wrap: balance;
  margin-bottom: 20px;
}

h1 em {
  font-style: italic;
  color: rgba(255,255,255,0.6);
}

.subtitle {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.7;
  text-wrap: pretty;
  max-width: 420px;
  margin: 0 auto;
}

/* ─── Input Area ────────────────────────────────────────── */
.input-area {
  width: 100%;
  margin-bottom: 24px;
}

/* Outer card: border-radius 20px, padding 8px → inner gets 12px */
.input-card {
  background: var(--surface);
  border-radius: 20px;
  padding: 8px;
  box-shadow: var(--shadow-card);
  transition-property: box-shadow;
  transition-duration: 200ms;
  transition-timing-function: ease-out;
}

.input-card:focus-within {
  box-shadow: var(--shadow-card-hover),
              0 0 0 1px rgba(74,222,128,0.2),
              0 0 40px rgba(74,222,128,0.04);
}

/* Inner textarea wrapper: 12px = 20 - 8 (concentric) */
.textarea-wrap {
  border-radius: 12px;
  background: var(--surface-2);
  overflow: hidden;
}

textarea {
  display: block;
  width: 100%;
  min-height: 160px;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  padding: 20px 20px 16px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 300;
  line-height: 1.65;
  color: var(--text-primary);
  caret-color: var(--accent);
}

textarea::placeholder {
  color: var(--text-tertiary);
}

.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 8px 8px 16px;
  gap: 12px;
}

/* Live token counter — tabular nums to prevent layout shift */
.token-live {
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--text-tertiary);
  transition-property: color, opacity;
  transition-duration: 150ms;
  transition-timing-function: ease-out;
}

.token-live.has-content {
  color: var(--text-secondary);
}

/* ─── Analyze Button ────────────────────────────────────── */
/* Outer: 12px radius, 4px padding → inner gets 8px */
.btn-analyze {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-3);
  border: none;
  border-radius: 12px;
  padding: 4px 4px 4px 16px;
  cursor: pointer;
  box-shadow: var(--shadow-border);
  transition-property: box-shadow, background-color, scale;
  transition-duration: 150ms;
  transition-timing-function: ease-out;
}

.btn-analyze:hover {
  background: #222;
  box-shadow: var(--shadow-border-hover);
}

.btn-analyze:active {
  scale: 0.96;
}

.btn-analyze:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-analyze:disabled:active {
  scale: 1;
}

.btn-label {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

/* Icon wrapper: 8px = 12 - 4 (concentric) */
.btn-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(74,222,128,0.15);
  position: relative;
  overflow: hidden;
}

/* Contextual icon animation: CSS cross-fade (no motion library) */
/* Both icons in DOM, one absolute-positioned on top */
.btn-icon-default,
.btn-icon-active {
  display: flex;
  align-items: center;
  justify-content: center;
  transition-property: opacity, scale, filter;
  transition-duration: 300ms;
  transition-timing-function: cubic-bezier(0.2, 0, 0, 1);
  will-change: transform, opacity, filter;
}

.btn-icon-active {
  position: absolute;
  inset: 0;
  /* hidden by default: scale 0.25, opacity 0, blur 4px */
  opacity: 0;
  scale: 0.25;
  filter: blur(4px);
}

/* When analyzing, show active icon, hide default */
.btn-analyze.analyzing .btn-icon-default {
  opacity: 0;
  scale: 0.25;
  filter: blur(4px);
}

.btn-analyze.analyzing .btn-icon-active {
  opacity: 1;
  scale: 1;
  filter: blur(0px);
}

.btn-icon-wrap svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
}

/* ─── Results Area ──────────────────────────────────────── */
.results-area {
  width: 100%;
  margin-bottom: 48px;
}

/* Stagger enter keyframe for result cards */
@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(12px);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

/* Exit state applied via JS */
@keyframes cardExit {
  from {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
  to {
    opacity: 0;
    transform: translateY(-8px);
    filter: blur(3px);
  }
}

.results-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-card {
  /* Outer: 18px radius, 8px padding → inner elements get ~10px */
  background: var(--surface);
  border-radius: 18px;
  padding: 8px;
  box-shadow: var(--shadow-card);
  opacity: 0;
  transition-property: box-shadow;
  transition-duration: 200ms;
  transition-timing-function: ease-out;
}

.result-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.result-card.visible {
  will-change: transform, opacity, filter;
  animation: cardEnter 400ms cubic-bezier(0.2, 0, 0, 1) forwards;
}

.result-card.exiting {
  will-change: transform, opacity, filter;
  animation: cardExit 150ms ease-in forwards;
}

/* Inner card: 10px = 18 - 8 (concentric) */
.card-inner {
  border-radius: 10px;
  background: var(--surface-2);
  padding: 20px 24px;
}

.card-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

/* Card 1: .card-label is a direct child of .result-card (no .card-inner wrapper) */
.result-card > .card-label {
  padding: 8px 8px 0;
}

/* ─── Metrics Grid ──────────────────────────────────────── */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  border-radius: 10px;
  overflow: hidden;
}

@media (min-width: 480px) {
  .metrics-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.metric-cell {
  background: var(--surface-2);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* First and last in row get rounded inner corners */
.metric-cell:first-child { border-radius: 10px 0 0 10px; }
.metric-cell:last-child  { border-radius: 0 10px 10px 0; }

@media (max-width: 479px) {
  .metric-cell:nth-child(1) { border-radius: 10px 0 0 0; }
  .metric-cell:nth-child(2) { border-radius: 0 10px 0 0; }
  .metric-cell:nth-child(3) { border-radius: 0 0 0 10px; }
  .metric-cell:nth-child(4) { border-radius: 0 0 10px 0; }
}

.metric-name,
.summary-label {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

.metric-value {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  line-height: 1;
}

.metric-unit {
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--text-secondary);
}

.metric-equiv {
  font-size: 10px;
  font-weight: 300;
  color: var(--text-tertiary);
  line-height: 1.4;
  margin-top: 2px;
}

/* ─── Summary Row ───────────────────────────────────────── */
.summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.summary-val {
  font-family: var(--mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--text-secondary);
}

.model-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 20px;
  padding: 4px 12px 4px 8px;
}

.model-badge--small {
  background: rgba(56,189,248,0.1);
  box-shadow: 0 0 0 1px rgba(56,189,248,0.18);
}
.model-badge--medium {
  background: var(--accent-dim);
  box-shadow: 0 0 0 1px rgba(74,222,128,0.18);
}
.model-badge--large {
  background: rgba(251,191,36,0.08);
  box-shadow: 0 0 0 1px rgba(251,191,36,0.18);
}

.model-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.model-badge--small  .model-dot { background: #38bdf8; }
.model-badge--medium .model-dot { background: var(--accent); }
.model-badge--large  .model-dot { background: #fbbf24; }

.model-text {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.model-badge--small  .model-text { color: #38bdf8; }
.model-badge--medium .model-text { color: var(--accent); }
.model-badge--large  .model-text { color: #fbbf24; }

.model-reason {
  font-size: 10px;
  font-weight: 300;
  color: var(--text-tertiary);
  margin-top: 4px;
  line-height: 1.4;
  text-wrap: pretty;
  max-width: 180px;
}

/* ─── Suggestions ───────────────────────────────────────── */
.suggestions-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.suggestion-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  /* Outer: 12px radius, 4px padding → inner text area gets ~8px implicit */
  border-radius: 12px;
  background: var(--surface-3);
  box-shadow: var(--shadow-border);
  transition-property: box-shadow, background-color;
  transition-duration: 150ms;
  transition-timing-function: ease-out;
}

.suggestion-item:hover {
  background: #202020;
  box-shadow: var(--shadow-border-hover);
}

.suggestion-icon {
  flex-shrink: 0;
  margin-top: 1px;
  opacity: 0.5;
}

.suggestion-icon svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

.suggestion-text {
  font-size: 13px;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.55;
  text-wrap: pretty;
}

.suggestion-text strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* ─── Footer ────────────────────────────────────────────── */
@property --glow-r {
  syntax: '<length>';
  inherits: false;
  initial-value: 240px;
}

@keyframes footer-breathe {
  0%, 100% { --glow-r: 240px; opacity: 0.6; }
  50%       { --glow-r: 300px; opacity: 1;   }
}

footer {
  position: relative;
  padding: 40px 0 56px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

/* horizon glow — animates radius only, no layout shift */
footer::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 380px;
  background: radial-gradient(
    circle var(--glow-r) at 50% 78%,
    rgba(74,222,128,0.16) 0%,
    rgba(74,222,128,0.07) 40%,
    rgba(74,222,128,0.02) 65%,
    transparent 85%
  );
  pointer-events: none;
  animation: footer-breathe 8s ease-in-out infinite;
}

.footer-main,
.footer-link,
.footer-cite {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-tertiary);
}

.footer-disclaimer {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-tertiary);
  opacity: 0.6;
}

.footer-main {
  letter-spacing: 0.1em;
}

.footer-copy {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-secondary);
  opacity: 0.45;
  margin-top: 6px;
}

.footer-copy-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  transition: opacity 150ms ease-out;
}

.footer-copy-link:hover {
  opacity: 0.8;
}

.footer-link {
  color: var(--accent);
  opacity: 0.6;
  text-decoration: none;
  transition-property: opacity;
  transition-duration: 150ms;
  transition-timing-function: ease-out;
}

.footer-link:hover {
  opacity: 1;
}

/* ─── Empty / Placeholder state ────────────────────────── */
.placeholder-hint {
  text-align: center;
  padding: 32px 0 16px;
  opacity: 0;
  transition-property: opacity;
  transition-duration: 300ms;
  transition-timing-function: ease-out;
}

.placeholder-hint.visible {
  opacity: 1;
}

.placeholder-hint p {
  font-size: 13px;
  color: var(--text-tertiary);
  font-style: italic;
  font-family: var(--serif);
}

/* ─── Theme toggle ──────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 24px;
  z-index: 100;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: var(--surface-2);
  box-shadow: var(--shadow-border);
  transition-property: box-shadow, background-color, scale;
  transition-duration: 150ms;
  transition-timing-function: ease-out;
}

.theme-toggle:hover {
  background: var(--surface-3);
  box-shadow: var(--shadow-border-hover);
}

.theme-toggle:active { scale: 0.96; }

/* Cross-fade icons — both always in DOM, absolute-positioned */
.theme-toggle-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition-property: opacity, scale, filter;
  transition-duration: 300ms;
  transition-timing-function: cubic-bezier(0.2, 0, 0, 1);
  will-change: opacity, scale, filter;
}

.theme-toggle-icon svg {
  width: 16px;
  height: 16px;
  color: var(--text-secondary);
}

/* Dark mode: sun visible (click → go light) */
.icon-sun  { opacity: 1; scale: 1;    filter: blur(0px); }
.icon-moon { opacity: 0; scale: 0.25; filter: blur(4px); }

/* Light mode: moon visible (click → go dark) */
[data-theme="light"] .icon-sun  { opacity: 0; scale: 0.25; filter: blur(4px); }
[data-theme="light"] .icon-moon { opacity: 1; scale: 1;    filter: blur(0px); }

/* Surface transitions for theme switching */
.input-card, .textarea-wrap, .card-inner, .theme-toggle {
  transition-property: background-color, box-shadow;
  transition-duration: 200ms;
  transition-timing-function: ease-out;
}

/* ─── Divider ───────────────────────────────────────────── */
.section-divider {
  width: 1px;
  height: 24px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.035), transparent);
  margin: 0 auto 16px;
}