/* ==========================================================================
   Wakaba Design System — system.css (Layer 7 Specimen & Tokens)
   Contract: DESIGN.md (rev 1)
   ========================================================================== */

:root {
  /* Color Tokens */
  --color-ink: #1c1a17;
  --color-ink-60: rgba(28, 26, 23, 0.62);
  --color-ink-30: rgba(28, 26, 23, 0.3);
  --color-ink-10: rgba(28, 26, 23, 0.08);
  --color-paper: #faf6ee;
  --color-paper-deep: #f3ecdf;
  --color-matcha: #4a6741;
  --color-matcha-soft: #e9ede4;
  --color-white: #ffffff;

  /* Typography Stacks */
  --font-display: "Fraunces", "Playfair Display", Georgia, serif;
  --font-body: "Lora", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing Scale (Base 4px) */
  --space-0: 0px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-14: 56px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  /* Layout & Container */
  --container-max: 1360px;
  --gutter: clamp(1.25rem, 4vw, 4rem);
  --section-padding-y: clamp(4rem, 10vh, 7rem);

  /* Radius & Borders */
  --radius-none: 0px;
  --radius-sm: 2px;
  --radius-pill: 9999px;
  --border-hairline: 1px solid var(--color-ink-30);
  --border-hairline-light: 1px solid rgba(250, 246, 238, 0.2);

  /* Motion & Easing */
  --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 180ms;
  --duration-medium: 300ms;
  --duration-slow: 700ms;
}

/* Tailwind v4 @theme binding */
@theme {
  --color-ink: #1c1a17;
  --color-ink-60: rgba(28, 26, 23, 0.62);
  --color-ink-30: rgba(28, 26, 23, 0.3);
  --color-paper: #faf6ee;
  --color-paper-deep: #f3ecdf;
  --color-matcha: #4a6741;
  --color-matcha-soft: #e9ede4;

  --font-display: "Fraunces", "Playfair Display", Georgia, serif;
  --font-body: "Lora", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

/* Universal box sizing */
*, *::before, *::after {
  box-sizing: border-box;
}

/* Root Canvas & Base Typography */
html {
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-paper);
  color: var(--color-ink);
  overflow-x: hidden;
}

/* Typography Hierarchy */
.font-display {
  font-family: var(--font-display);
}

.font-body {
  font-family: var(--font-body);
}

.font-mono {
  font-family: var(--font-mono);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-ink-60);
  margin-bottom: var(--space-3);
  display: block;
}

.heading-display {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 5.5vw, 4.5rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0;
}

.heading-section {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0;
}

.heading-card {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.25;
  color: var(--color-ink);
  margin: 0;
}

.text-body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-ink-60);
  margin: 0;
}

.text-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-ink-60);
}

/* Links */
a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--color-matcha);
}

/* Component Primitives */

/* Primary Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-matcha);
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-matcha);
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}

.btn-primary:hover {
  background-color: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-paper);
}

/* Ghost Button */
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-ink);
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}

.btn-ghost:hover {
  background-color: var(--color-ink);
  color: var(--color-paper);
}

/* Tag */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-matcha);
  background-color: var(--color-matcha-soft);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  line-height: 1.2;
}

/* Underlined Input */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
}

.input-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-ink-60);
}

.input-underlined {
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--color-ink-30);
  border-radius: 0;
  padding: 12px 0;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-ink);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.input-underlined::placeholder {
  color: var(--color-ink-60);
  font-style: italic;
}

.input-underlined:focus {
  border-bottom-color: var(--color-matcha);
}

/* Cards & Surfaces */
.card-paper {
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-sm);
  padding: 32px;
  border: 1px solid transparent;
}

.card-bordered {
  background-color: var(--color-paper);
  border: var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 32px;
}

.card-highlight {
  background-color: var(--color-paper);
  border: 2px solid var(--color-matcha);
  border-radius: var(--radius-sm);
  padding: 32px;
}

/* Hairline Divider */
.divider-hairline {
  border: none;
  border-top: var(--border-hairline);
  margin: 0;
  padding: 0;
  width: 100%;
}

/* Focus Visible Floor */
:focus-visible {
  outline: 2px solid var(--color-matcha);
  outline-offset: 2px;
}

/* Reduced Motion Floor */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .word-inner, .fade-rise, .tier-card {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
  }
}