/* ═══════════════════════════════════════════════════════════════════════════
   AMG Companies — Claude AI Usage Agreement
   Premium dark-mode design system
   ═══════════════════════════════════════════════════════════════════════════ */

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

:root {
  --bg-dark:      #0b0e14;
  --bg-section:   #10141c;
  --bg-card:      #161b27;
  --bg-card-alt:  #1c2233;
  --surface:      #232a3b;
  --border:       #2a3348;
  --border-light: #35405a;

  --text-primary:   #e8ecf4;
  --text-secondary: #9aa3b8;
  --text-muted:     #636d84;

  --accent-blue:    #5b9bf5;
  --accent-purple:  #a78bfa;
  --accent-cyan:    #67e8f9;
  --accent-green:   #6ee7b7;
  --accent-amber:   #fbbf24;
  --accent-red:     #f87171;
  --accent-orange:  #fb923c;

  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 40%, #172554 100%);
  --gradient-accent: linear-gradient(135deg, #5b9bf5 0%, #a78bfa 50%, #67e8f9 100%);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.3);
  --shadow-md:  0 4px 20px rgba(0,0,0,.35);
  --shadow-lg:  0 8px 40px rgba(0,0,0,.45);
  --shadow-glow: 0 0 40px rgba(91,155,245,.15);

  --font: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Hero ──────────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  overflow: hidden;
  text-align: center;
  padding: 60px 24px;
}
.hero-glow {
  position: absolute;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(91,155,245,.12) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: pulseGlow 6s ease-in-out infinite;
}
@keyframes pulseGlow {
  0%, 100% { opacity: .6; transform: translate(-50%,-50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%,-50%) scale(1.15); }
}
.hero-content { position: relative; z-index: 2; max-width: 680px; }
.hero-eyebrow {
  font-size: 12px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent-blue); margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(36px, 7vw, 64px); font-weight: 900; line-height: 1.08;
  color: #fff; margin-bottom: 24px;
}
.hero-title span {
  background: var(--gradient-accent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 17px; color: var(--text-secondary); max-width: 540px;
  margin: 0 auto 40px; line-height: 1.75;
}
.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px;
  background: var(--gradient-accent); color: #0b0e14;
  font-weight: 700; font-size: 15px; text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(91,155,245,.3);
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 32px rgba(91,155,245,.45); }
.hero-badge {
  position: absolute; bottom: 32px; right: 40px;
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.06); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 50px; padding: 8px 18px;
  font-size: 12px; color: var(--text-secondary); font-weight: 500;
}
.badge-icon { font-size: 16px; }

/* ── Progress Bar ─────────────────────────────────────────────────────────── */
.progress-track {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,14,20,.92); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}
.progress-fill {
  position: absolute; bottom: 0; left: 0; height: 2px;
  background: var(--gradient-accent);
  width: 0%; transition: width .4s ease;
}
.progress-steps {
  display: flex; justify-content: center; gap: 12px;
  max-width: 800px; margin: 0 auto;
}
.progress-steps .step {
  padding: 14px 16px; font-size: 12px; font-weight: 600;
  letter-spacing: .5px; text-transform: uppercase;
  color: var(--text-muted); cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}
.progress-steps .step.active { color: var(--accent-blue); border-bottom-color: var(--accent-blue); }
.progress-steps .step:hover { color: var(--text-secondary); }

/* ── Sections ─────────────────────────────────────────────────────────────── */
.section {
  padding: 100px 24px;
  max-width: 960px; margin: 0 auto;
}
.section-dark {
  max-width: 100%;
  background: var(--bg-section);
}
.section-dark > * {
  max-width: 960px; margin-left: auto; margin-right: auto;
}
.section-header { text-align: center; margin-bottom: 56px; }
.section-number {
  display: inline-block;
  font-size: 13px; font-weight: 800; letter-spacing: 2px;
  color: var(--accent-blue); background: rgba(91,155,245,.1);
  padding: 6px 16px; border-radius: 50px; margin-bottom: 16px;
}
.section-header h2 {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800;
  margin-bottom: 12px; color: #fff;
}
.section-subtitle {
  font-size: 16px; color: var(--text-secondary); max-width: 520px;
  margin: 0 auto;
}

/* ── Philosophy Cards ─────────────────────────────────────────────────────── */
.philosophy-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  margin-bottom: 48px;
}
.phil-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  transition: var(--transition);
}
.phil-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.phil-card.wrong { border-color: rgba(248,113,113,.2); }
.phil-card.wrong:hover { border-color: rgba(248,113,113,.35); }
.phil-card.right { border-color: rgba(110,231,183,.2); }
.phil-card.right:hover { border-color: rgba(110,231,183,.35); }
.phil-icon { font-size: 32px; margin-bottom: 16px; }
.phil-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: #fff; }
.phil-card > p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.phil-example {
  background: var(--bg-dark); border-radius: var(--radius-md);
  padding: 18px; margin-top: 12px;
}
.example-label {
  display: inline-block; font-size: 10px; font-weight: 700;
  letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 10px;
}
.example-note { font-size: 13px; color: var(--text-muted); margin-top: 10px; line-height: 1.6; }

/* ── Code Blocks ──────────────────────────────────────────────────────────── */
.code-block {
  background: #0d1117; border: 1px solid #21262d;
  border-radius: var(--radius-sm); padding: 16px 18px;
  overflow-x: auto;
}
.code-block.dark { background: #080c14; border-color: var(--border); }
.code-block code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 13px; color: var(--accent-cyan); line-height: 1.7;
}
.code-header {
  font-size: 11px; font-weight: 600; color: var(--text-muted);
  margin-bottom: 10px; letter-spacing: .5px;
}

/* ── Principle Cards ──────────────────────────────────────────────────────── */
.principle-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 40px; }
.principle {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 28px;
  position: relative; overflow: hidden; transition: var(--transition);
}
.principle:hover { border-color: var(--accent-blue); transform: translateY(-2px); }
.principle::before {
  content: attr(data-num);
  position: absolute; top: -8px; right: 12px;
  font-size: 64px; font-weight: 900; color: rgba(91,155,245,.06);
}
.principle h4 { font-size: 16px; font-weight: 700; color: var(--accent-blue); margin-bottom: 8px; }
.principle p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }

/* ── Callouts ─────────────────────────────────────────────────────────────── */
.callout {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px 24px; border-radius: var(--radius-md);
  margin-bottom: 40px;
}
.callout-icon { font-size: 22px; flex-shrink: 0; margin-top: 2px; }
.callout-body { font-size: 14px; line-height: 1.7; color: var(--text-secondary); }
.callout-body strong { color: var(--text-primary); }
.callout.insight { background: rgba(91,155,245,.07); border: 1px solid rgba(91,155,245,.15); }
.callout.info    { background: rgba(103,232,249,.06); border: 1px solid rgba(103,232,249,.12); }
.callout.warning { background: rgba(251,191,36,.07);  border: 1px solid rgba(251,191,36,.15); }

/* ── Tier Accordion ───────────────────────────────────────────────────────── */
.tier-accordion { display: flex; flex-direction: column; gap: 12px; margin-bottom: 48px; }
.tier-card { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border); transition: var(--transition); }
.tier-card:hover { box-shadow: var(--shadow-md); }
.tier-header {
  width: 100%; display: flex; align-items: center; gap: 16px;
  background: var(--bg-card); border: none; cursor: pointer;
  padding: 18px 24px; color: var(--text-primary);
  font-family: var(--font); text-align: left; transition: var(--transition);
}
.tier-header:hover { background: var(--bg-card-alt); }
.tier-badge {
  font-size: 10px; font-weight: 800; letter-spacing: 1px;
  padding: 4px 12px; border-radius: 50px; flex-shrink: 0;
}
.tier-badge.green  { background: rgba(110,231,183,.12); color: var(--accent-green); }
.tier-badge.yellow { background: rgba(251,191,36,.12);  color: var(--accent-amber); }
.tier-badge.orange { background: rgba(251,146,60,.12);  color: var(--accent-orange); }
.tier-badge.red    { background: rgba(248,113,113,.12); color: var(--accent-red); }

.tier-title { flex: 1; }
.tier-title h3 { font-size: 16px; font-weight: 700; margin-bottom: 2px; }
.tier-verdict { font-size: 12px; color: var(--text-muted); }
.tier-chevron {
  font-size: 16px; color: var(--text-muted); transition: transform .3s;
}
.tier-card.open .tier-chevron { transform: rotate(90deg); }

.tier-body {
  max-height: 0; overflow: hidden;
  transition: max-height .4s cubic-bezier(.4,0,.2,1), padding .3s;
  background: var(--bg-dark); padding: 0 24px;
}
.tier-card.open .tier-body { max-height: 400px; padding: 20px 24px; }
.tier-body ul { list-style: none; padding: 0; }
.tier-body li {
  padding: 6px 0 6px 20px; font-size: 14px; color: var(--text-secondary);
  position: relative;
}
.tier-body li::before {
  content: ''; position: absolute; left: 0; top: 14px;
  width: 6px; height: 6px; border-radius: 50%;
}
.tier-green .tier-body li::before  { background: var(--accent-green); }
.tier-yellow .tier-body li::before { background: var(--accent-amber); }
.tier-orange .tier-body li::before { background: var(--accent-orange); }
.tier-red .tier-body li::before    { background: var(--accent-red); }
.tier-guidance {
  margin-top: 14px; padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-muted); font-style: italic;
}

/* ── Quick Check ──────────────────────────────────────────────────────────── */
.tier-interactive-check {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px; text-align: center;
}
.tier-interactive-check h3 { font-size: 18px; font-weight: 700; margin-bottom: 20px; }
.quick-check-box { max-width: 480px; margin: 0 auto; }
.quick-check-box select {
  width: 100%; padding: 14px 18px; border-radius: var(--radius-md);
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; font-family: var(--font);
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%639aa3b8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 16px center;
}
.quick-check-box select:focus { outline: none; border-color: var(--accent-blue); }
.quick-check-result {
  margin-top: 16px; padding: 16px 20px; border-radius: var(--radius-md);
  font-size: 14px; font-weight: 600; min-height: 54px;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.quick-check-result.t1 { background: rgba(110,231,183,.1); color: var(--accent-green); border: 1px solid rgba(110,231,183,.2); }
.quick-check-result.t2 { background: rgba(251,191,36,.1);  color: var(--accent-amber); border: 1px solid rgba(251,191,36,.2); }
.quick-check-result.t3 { background: rgba(251,146,60,.1);  color: var(--accent-orange); border: 1px solid rgba(251,146,60,.2); }
.quick-check-result.t4 { background: rgba(248,113,113,.1); color: var(--accent-red); border: 1px solid rgba(248,113,113,.2); }

/* ── Masking Flow ─────────────────────────────────────────────────────────── */
.flow-title { font-size: 18px; font-weight: 700; margin-bottom: 32px; text-align: center; }
.masking-flow { position: relative; max-width: 700px; margin: 0 auto 40px; }
.flow-step {
  display: flex; gap: 24px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px; transition: var(--transition);
}
.flow-step:hover { border-color: var(--accent-purple); box-shadow: var(--shadow-glow); }
.flow-num {
  width: 40px; height: 40px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-accent); border-radius: 50%;
  font-size: 16px; font-weight: 800; color: var(--bg-dark);
}
.flow-body { flex: 1; }
.flow-body h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: #fff; }
.flow-body > p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 16px; }
.flow-connector {
  display: flex; justify-content: center; padding: 8px 0;
}
.flow-connector span {
  font-size: 20px; color: var(--text-muted); animation: bounceArrow 2s ease-in-out infinite;
}
@keyframes bounceArrow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ── Mask Visual ──────────────────────────────────────────────────────────── */
.mask-visual {
  display: flex; align-items: center; gap: 16px;
  margin-top: 16px; flex-wrap: wrap;
}
.mask-before, .mask-after {
  flex: 1; min-width: 200px; background: var(--bg-dark);
  border-radius: var(--radius-sm); padding: 14px; border: 1px solid var(--border);
}
.mask-label {
  display: block; font-size: 10px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 10px;
}
.mask-row {
  display: flex; justify-content: space-between; padding: 5px 0;
  font-size: 13px; color: var(--text-secondary);
  font-family: 'SF Mono', 'Fira Code', monospace;
}
.mask-row .masked { color: var(--accent-green); font-weight: 600; }
.mask-arrow { font-size: 24px; color: var(--accent-purple); flex-shrink: 0; }

/* ── Guidelines ───────────────────────────────────────────────────────────── */
.guidelines-columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
.guideline-col {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 28px; border: 1px solid var(--border); transition: var(--transition);
}
.guideline-col:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.guideline-col h3 { font-size: 15px; font-weight: 700; margin-bottom: 16px; color: #fff; display: flex; align-items: center; gap: 8px; }
.gl-icon { font-size: 18px; }
.guideline-col ul { list-style: none; padding: 0; }
.guideline-col li {
  padding: 7px 0 7px 18px; font-size: 13px; color: var(--text-secondary);
  line-height: 1.6; position: relative;
}
.guideline-col li::before {
  content: ''; position: absolute; left: 0; top: 13px;
  width: 5px; height: 5px; border-radius: 50%;
}
.guideline-col.do li::before      { background: var(--accent-green); }
.guideline-col.caution li::before { background: var(--accent-amber); }
.guideline-col.never li::before   { background: var(--accent-red); }

.guideline-col.do      { border-color: rgba(110,231,183,.15); }
.guideline-col.caution { border-color: rgba(251,191,36,.15); }
.guideline-col.never   { border-color: rgba(248,113,113,.15); }

.escalation-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px; text-align: center;
}
.escalation-box h3 { font-size: 18px; margin-bottom: 10px; }
.escalation-box p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; max-width: 600px; margin: 0 auto; }

/* ── Agreement Card ───────────────────────────────────────────────────────── */
.agreement-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 48px;
  box-shadow: var(--shadow-lg);
}
.agreement-intro p { font-size: 15px; color: var(--text-secondary); line-height: 1.75; margin-bottom: 32px; }

.check-group { display: flex; flex-direction: column; gap: 14px; margin-bottom: 40px; }
.check-item {
  display: flex; align-items: flex-start; gap: 14px;
  cursor: pointer; padding: 14px 20px;
  background: var(--bg-dark); border: 1px solid var(--border);
  border-radius: var(--radius-md); transition: var(--transition);
  position: relative;
}
.check-item:hover { border-color: var(--accent-blue); }
.check-item input { display: none; }
.checkmark {
  width: 22px; height: 22px; flex-shrink: 0;
  border: 2px solid var(--border-light); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition); margin-top: 1px;
}
.check-item input:checked ~ .checkmark {
  background: var(--accent-blue); border-color: var(--accent-blue);
}
.check-item input:checked ~ .checkmark::after {
  content: '✓'; color: #fff; font-size: 13px; font-weight: 700;
}
.check-item input:checked ~ .check-text { color: var(--text-primary); }
.check-text { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.check-text strong { color: var(--text-primary); }

/* ── Signature Area ───────────────────────────────────────────────────────── */
.signature-area {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 32px;
}
.sig-field label {
  display: block; font-size: 12px; font-weight: 600;
  color: var(--text-muted); letter-spacing: .5px; margin-bottom: 6px;
  text-transform: uppercase;
}
.sig-field input {
  width: 100%; padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--bg-dark); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; font-family: var(--font);
  transition: var(--transition);
}
.sig-field input:focus { outline: none; border-color: var(--accent-blue); box-shadow: 0 0 0 3px rgba(91,155,245,.15); }
.sig-field input:disabled { color: var(--text-muted); cursor: not-allowed; }

.submit-btn {
  width: 100%; padding: 18px; border: none; border-radius: var(--radius-md);
  background: var(--surface); color: var(--text-muted);
  font-size: 16px; font-weight: 700; font-family: var(--font);
  cursor: not-allowed; display: flex; align-items: center;
  justify-content: center; gap: 10px; transition: var(--transition);
}
.submit-btn.ready {
  background: var(--gradient-accent); color: var(--bg-dark);
  cursor: pointer; box-shadow: 0 4px 24px rgba(91,155,245,.3);
}
.submit-btn.ready:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 32px rgba(91,155,245,.45);
}

/* ── Success Card ─────────────────────────────────────────────────────────── */
.success-card {
  text-align: center; padding: 60px 40px;
  background: var(--bg-card); border: 1px solid rgba(110,231,183,.2);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-lg);
  animation: fadeInUp .6s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.success-icon { font-size: 56px; margin-bottom: 20px; }
.success-card h3 { font-size: 24px; font-weight: 800; color: var(--accent-green); margin-bottom: 12px; }
.success-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }
.success-note { margin-top: 12px; font-size: 14px; color: var(--text-muted); }
.success-badge {
  display: inline-flex; align-items: center; gap: 10px;
  margin-top: 32px; padding: 12px 28px;
  background: rgba(110,231,183,.08); border: 1px solid rgba(110,231,183,.2);
  border-radius: 50px; font-size: 14px; font-weight: 700;
  color: var(--accent-green);
}

/* ── Footer ───────────────────────────────────────────────────────────────── */
.footer {
  text-align: center; padding: 40px 24px;
  border-top: 1px solid var(--border);
}
.footer p { font-size: 13px; color: var(--text-muted); }
.footer-sub { margin-top: 6px; font-size: 12px; color: var(--text-muted); opacity: .7; }

/* ── Claude Models Section ────────────────────────────────────────────────── */
.model-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-bottom: 40px;
}
.model-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); overflow: hidden;
  display: flex; flex-direction: column; transition: var(--transition);
}
.model-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.model-card.haiku  { border-top: 3px solid #38bdf8; }
.model-card.haiku:hover  { border-color: #38bdf8;  box-shadow: 0 12px 40px rgba(56,189,248,.15); }
.model-card.sonnet { border-top: 3px solid var(--accent-blue); }
.model-card.sonnet:hover { border-color: var(--accent-blue);   box-shadow: 0 12px 40px rgba(91,155,245,.18); }
.model-card.opus   { border-top: 3px solid var(--accent-purple); }
.model-card.opus:hover   { border-color: var(--accent-purple); box-shadow: 0 12px 40px rgba(167,139,250,.18); }

.model-card-header {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 22px 16px; border-bottom: 1px solid var(--border);
  background: var(--bg-card-alt);
}
.model-icon { font-size: 28px; flex-shrink: 0; }
.model-meta { flex: 1; min-width: 0; }
.model-name { font-size: 16px; font-weight: 800; color: #fff; line-height: 1.2; }
.model-tier-label { font-size: 11px; color: var(--text-muted); margin-top: 3px; }

.model-cost-badge {
  font-size: 10px; font-weight: 800; letter-spacing: .5px;
  padding: 4px 10px; border-radius: 50px; white-space: nowrap; flex-shrink: 0;
}
.model-cost-badge.haiku  { background: rgba(56,189,248,.1);   color: #38bdf8; }
.model-cost-badge.sonnet { background: rgba(91,155,245,.1);   color: var(--accent-blue); }
.model-cost-badge.opus   { background: rgba(167,139,250,.12); color: var(--accent-purple); }

.model-card-body { padding: 20px 22px; flex: 1; }
.model-desc {
  font-size: 13px; color: var(--text-secondary); line-height: 1.7;
  margin-bottom: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--border);
}
.model-section-label {
  font-size: 10px; font-weight: 800; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--text-muted); margin: 14px 0 8px;
}
.model-list { list-style: none; padding: 0; }
.model-list li {
  font-size: 13px; color: var(--text-secondary); line-height: 1.6;
  padding: 4px 0 4px 18px; position: relative;
}
.model-list li::before {
  content: ''; position: absolute; left: 0; top: 10px;
  width: 6px; height: 6px; border-radius: 50%;
}
.model-list.plus  li::before { background: var(--accent-green); }
.model-list.minus li::before { background: var(--accent-red); }
.model-list.use   li::before { background: var(--accent-blue); }

.model-cost-row {
  padding: 14px 22px; background: rgba(0,0,0,.25);
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 6px;
}
.model-cost-item { display: flex; justify-content: space-between; align-items: center; }
.cost-label { font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }
.cost-val   { font-size: 13px; font-weight: 700; color: var(--text-primary); font-family: 'SF Mono','Fira Code',monospace; }
.model-cost-note {
  font-size: 11px; color: var(--text-muted); margin-top: 4px;
  border-top: 1px solid var(--border); padding-top: 8px; line-height: 1.6;
}

/* ── Model Picker ─────────────────────────────────────────────────────────── */
.model-picker {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px; margin-bottom: 8px;
}
.model-picker .flow-title { margin-bottom: 24px; }
.picker-flow { display: flex; flex-direction: column; gap: 0; }
.picker-q {
  font-size: 14px; font-weight: 600; color: var(--text-primary);
  padding: 14px 20px; background: var(--bg-dark);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border: 1px solid var(--border); border-bottom: none;
}
.picker-options {
  display: flex; gap: 12px; flex-wrap: wrap;
  padding: 12px 20px; background: rgba(0,0,0,.15);
  border: 1px solid var(--border); border-top: none;
  margin-bottom: 16px; border-radius: 0 0 var(--radius-md) var(--radius-md);
}
.picker-opt {
  font-size: 13px; padding: 7px 16px; border-radius: 50px;
  font-weight: 600; display: inline-flex; align-items: center; gap: 6px;
}
.picker-opt span { font-weight: 500; }
.picker-opt.haiku  { background: rgba(56,189,248,.1);   color: #38bdf8;  border: 1px solid rgba(56,189,248,.2); }
.picker-opt.sonnet { background: rgba(91,155,245,.1);   color: var(--accent-blue);   border: 1px solid rgba(91,155,245,.2); }
.picker-opt.opus   { background: rgba(167,139,250,.12); color: var(--accent-purple); border: 1px solid rgba(167,139,250,.2); }
.picker-opt.check  { background: rgba(255,255,255,.04); color: var(--text-muted); border: 1px solid var(--border); }

/* ── Token Explainer ─────────────────────────────────────────────────────── */
.token-explainer {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  margin-bottom: 24px;
}
.token-explainer-header {
  display: flex; align-items: center; gap: 16px; margin-bottom: 20px;
}
.token-explainer-icon { font-size: 32px; flex-shrink: 0; }
.token-explainer-title {
  font-size: 18px; font-weight: 800; color: #fff; line-height: 1.3;
}
.token-explainer-sub {
  font-size: 12px; color: var(--text-muted); margin-top: 3px;
}
.token-body-text {
  font-size: 14px; color: var(--text-secondary); line-height: 1.75;
  margin-bottom: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--border);
}
.token-body-text strong { color: var(--text-primary); }
.token-body-text em { color: var(--accent-blue); font-style: normal; font-weight: 600; }

/* Token visualization row */
.token-visual-row {
  display: grid; grid-template-columns: 1fr 1.3fr;
  gap: 24px; margin-bottom: 24px; padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.token-example {
  background: var(--bg-dark); border-radius: var(--radius-md);
  padding: 20px; display: flex; flex-direction: column; gap: 12px;
  border: 1px solid var(--border);
}
.token-example-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--text-muted);
}
.token-example-sentence {
  display: flex; flex-wrap: wrap; gap: 4px; align-items: center;
}
.tok {
  padding: 4px 10px; border-radius: 6px;
  font-size: 13px; font-weight: 600; font-family: 'SF Mono','Fira Code',monospace;
  border: 1px solid transparent;
}
.tok.t1 { background: rgba(91,155,245,.15);  color: #93c5fd; border-color: rgba(91,155,245,.25); }
.tok.t2 { background: rgba(167,139,250,.15); color: #c4b5fd; border-color: rgba(167,139,250,.25); }
.tok.t3 { background: rgba(110,231,183,.12); color: #6ee7b7; border-color: rgba(110,231,183,.2); }
.tok.t4 { background: rgba(251,191,36,.12);  color: #fcd34d; border-color: rgba(251,191,36,.2); }
.token-example-note {
  font-size: 12px; color: var(--text-muted); line-height: 1.6;
}

/* Usage flow steps */
.token-flow-cards { display: flex; flex-direction: column; gap: 10px; }
.token-flow-item {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--bg-dark); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 14px 16px;
}
.token-flow-num {
  width: 26px; height: 26px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(91,155,245,.15); border: 1px solid rgba(91,155,245,.25);
  border-radius: 50%; font-size: 11px; font-weight: 800; color: var(--accent-blue);
}
.token-flow-text {
  font-size: 13px; color: var(--text-secondary); line-height: 1.6;
}
.token-flow-text strong { color: var(--text-primary); }
.token-flow-text em { color: var(--accent-blue); font-style: normal; font-weight: 600; }

/* Reference cards */
.token-reference-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px; margin-bottom: 20px;
}
.token-ref-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 16px 14px; text-align: center;
  transition: var(--transition);
}
.token-ref-card:hover { border-color: var(--accent-blue); transform: translateY(-2px); }
.token-ref-icon  { font-size: 24px; margin-bottom: 8px; }
.token-ref-label { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; line-height: 1.4; }
.token-ref-val   { font-size: 13px; font-weight: 700; color: var(--accent-blue); font-family: 'SF Mono','Fira Code',monospace; }

/* Practical tip */
.token-tip {
  display: flex; align-items: flex-start; gap: 12px;
  background: rgba(110,231,183,.06); border: 1px solid rgba(110,231,183,.14);
  border-radius: var(--radius-md); padding: 16px 18px;
  font-size: 13px; color: var(--text-secondary); line-height: 1.7;
}
.token-tip-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
.token-tip strong { color: var(--text-primary); }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .model-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .philosophy-grid, .guidelines-columns { grid-template-columns: 1fr; }
  .principle-cards { grid-template-columns: 1fr; }
  .signature-area { grid-template-columns: 1fr; }
  .mask-visual { flex-direction: column; }
  .mask-arrow { transform: rotate(90deg); }
  .progress-steps { gap: 4px; flex-wrap: wrap; }
  .progress-steps .step { padding: 10px 8px; font-size: 10px; }
  .hero-badge { bottom: 20px; right: 20px; }
  .agreement-card { padding: 28px; }
  .flow-step { flex-direction: column; gap: 16px; }
  .model-grid { grid-template-columns: 1fr; }
  .picker-options { flex-direction: column; }
  .token-visual-row { grid-template-columns: 1fr; }
  .token-reference-row { grid-template-columns: 1fr 1fr; }
}