/* ─── FONTS (self-hosted, SIL OFL 1.1 — see fonts/OFL.txt) ─── */
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url(fonts/ibm-plex-sans-latin-300-normal.woff2) format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/ibm-plex-sans-latin-400-normal.woff2) format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/ibm-plex-sans-latin-500-normal.woff2) format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/ibm-plex-mono-latin-400-normal.woff2) format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/ibm-plex-mono-latin-500-normal.woff2) format('woff2');
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #777777;
  --color-text-tertiary: #AAAAAA;
  --color-text-disabled: #D0D0CE;
  --color-text-inverse: #FFFFFF;

  --color-background-page: #FFFFFF;
  --color-background-surface: #FFFFFF;
  --color-background-subtle: #F7F7F6;
  --color-background-muted: #EFEFED;
  --color-background-hover: #EFEFED;
  --color-background-disabled: #EFEFED;
  --color-background-accent: #EEF2EC;
  --color-background-accentSubtle: #F4F7F3;

  --color-border-default: #E4E4E2;
  --color-border-subtle: #E4E4E2;
  --color-border-strong: #888888;
  --color-border-focus: #2D6A4F;

  --color-action-primary: #2D6A4F;
  --color-action-primaryHover: #234F3E;
  --color-action-primaryActive: #1B3D30;
  --color-action-disabled: #D0D0CE;

  --color-status-success: #EEF2EC;
  --color-status-successText: #1B3D30;
  --color-status-warning: #FFFBEB;
  --color-status-warningText: #B45309;
  --color-status-warningBorder: #FDE68A;

  --spacing-3xs: 4px;
  --spacing-2xs: 8px;
  --spacing-xs: 12px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  --spacing-3xl: 80px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --motion-duration-fast: 100ms;
  --motion-duration-medium: 150ms;
  --motion-duration-slow: 200ms;
  --motion-easing-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --motion-easing-out: cubic-bezier(0, 0, 0.2, 1);

  --typography-font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --typography-font-heading: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --typography-font-mono: 'IBM Plex Mono', 'SFMono-Regular', 'Consolas', monospace;

  --typography-size-micro: 11px;
  --typography-size-caption: 13px;
  --typography-size-body: 14px;
  --typography-size-bodyLg: 15px;
  --typography-size-subtitle: 17px;
  --typography-size-headingSm: 22px;
  --typography-size-headingMd: 28px;
  --typography-size-display: 42px;

  --typography-weight-light: 300;
  --typography-weight-regular: 400;
  --typography-weight-medium: 500;
  --typography-lineHeight-snug: 1.3;
  --typography-lineHeight-normal: 1.5;
  --typography-lineHeight-relaxed: 1.65;
  --typography-letterSpacing-tight: -0.02em;
  --typography-letterSpacing-mono: 0.08em;
  --typography-letterSpacing-caps: 0.1em;

  --bg: var(--color-background-page);
  --bg-alt: var(--color-background-subtle);
  --border: var(--color-border-default);
  --text-1: var(--color-text-primary);
  --text-2: var(--color-text-secondary);
  --text-3: var(--color-text-tertiary);
  --accent: var(--color-action-primary);
  --accent-dim: var(--color-background-accent);
  --mono: var(--typography-font-mono);
  --serif: var(--typography-font-heading);
  --sans: var(--typography-font-body);
}

html {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--sans);
  font-size: var(--typography-size-body);
  line-height: var(--typography-lineHeight-normal);
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
}

a:hover {
  color: var(--color-action-primaryHover);
}

a:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-border-focus);
  border-radius: var(--radius-sm);
}

/* ─── LAYOUT ─── */
.container {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ─── HEADER ─── */
header {
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-md) 0;
  animation: fadeDown 0.5s ease both;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2xs);
  font-family: var(--sans);
  font-size: var(--typography-size-subtitle);
  font-weight: var(--typography-weight-medium);
  letter-spacing: 0;
  color: var(--text-1);
  text-decoration: none;
}

.logo:hover {
  color: var(--text-1);
}

nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

nav a {
  font-family: var(--mono);
  font-size: var(--typography-size-micro);
  text-transform: uppercase;
  letter-spacing: var(--typography-letterSpacing-mono);
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--motion-duration-medium) var(--motion-easing-standard);
}

nav a:hover {
  color: var(--text-1);
}

nav a.lang-switch {
  color: var(--text-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px var(--spacing-2xs);
}

nav a.lang-switch:hover {
  border-color: var(--color-border-strong);
}

/* ─── STATUS BADGE ─── */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2xs);
  font-family: var(--mono);
  font-size: var(--typography-size-micro);
  text-transform: uppercase;
  letter-spacing: var(--typography-letterSpacing-caps);
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--color-border-default);
  padding: var(--spacing-3xs) var(--spacing-xs);
  border-radius: var(--radius-sm);
}

.status-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.5s ease-in-out infinite;
}

/* ─── HERO ─── */
.hero {
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  animation: fadeUp 0.6s ease 0.1s both;
}

.hero-eyebrow {
  margin-bottom: var(--spacing-md);
}

.hero h1 {
  font-family: var(--sans);
  font-size: clamp(var(--typography-size-headingMd), 5vw, var(--typography-size-display));
  font-weight: var(--typography-weight-medium);
  line-height: var(--typography-lineHeight-snug);
  letter-spacing: var(--typography-letterSpacing-tight);
  color: var(--text-1);
  max-width: 620px;
  margin-bottom: var(--spacing-md);
}

.hero h1 em {
  font-style: normal;
  font-weight: var(--typography-weight-light);
  color: var(--text-2);
}

.hero-sub {
  font-size: var(--typography-size-subtitle);
  font-weight: var(--typography-weight-light);
  color: var(--text-2);
  max-width: 560px;
  line-height: var(--typography-lineHeight-relaxed);
  margin-bottom: var(--spacing-xl);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  align-items: center;
}

.btn-primary {
  font-family: var(--sans);
  font-size: var(--typography-size-body);
  text-transform: none;
  letter-spacing: 0;
  color: var(--color-text-inverse);
  background: var(--accent);
  border: 1px solid var(--accent);
  padding: var(--spacing-2xs) var(--spacing-sm);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: background-color var(--motion-duration-medium) var(--motion-easing-standard);
}

.btn-primary:hover {
  color: var(--color-text-inverse);
  background: var(--color-action-primaryHover);
  border-color: var(--color-action-primaryHover);
}

.btn-primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-border-focus);
}

.btn-secondary {
  font-family: var(--sans);
  font-size: var(--typography-size-body);
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-2);
  background: transparent;
  border: 1px solid var(--border);
  padding: var(--spacing-2xs) var(--spacing-sm);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition:
    border-color var(--motion-duration-medium) var(--motion-easing-standard),
    color var(--motion-duration-medium) var(--motion-easing-standard),
    background-color var(--motion-duration-medium) var(--motion-easing-standard);
}

.btn-secondary:hover {
  border-color: var(--color-border-strong);
  color: var(--text-1);
  background: var(--color-background-hover);
}

.btn-secondary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-border-focus);
}

/* ─── DIVIDER ─── */
.section-divider {
  width: 100%;
  height: 1px;
  background: var(--border);
}

/* ─── SECTION BASE ─── */
section {
  padding: var(--spacing-2xl) 0;
  animation: fadeUp 0.6s ease 0.2s both;
  scroll-margin-top: var(--spacing-md);
}

section.alt {
  background: var(--bg-alt);
}

.section-label {
  font-family: var(--mono);
  font-size: var(--typography-size-micro);
  text-transform: uppercase;
  letter-spacing: var(--typography-letterSpacing-caps);
  color: var(--text-3);
  margin-bottom: var(--spacing-md);
}

.prose h2 {
  font-family: var(--sans);
  font-size: var(--typography-size-headingSm);
  font-weight: var(--typography-weight-medium);
  line-height: var(--typography-lineHeight-snug);
  color: var(--text-1);
  margin-bottom: var(--spacing-sm);
}

.prose p {
  font-size: var(--typography-size-bodyLg);
  color: var(--text-2);
  line-height: var(--typography-lineHeight-relaxed);
  margin-bottom: var(--spacing-sm);
  max-width: 640px;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  font-weight: var(--typography-weight-medium);
  color: var(--text-1);
}

/* ─── STEPS (three-column grid) ─── */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  margin-top: var(--spacing-lg);
}

.step-item {
  padding: var(--spacing-md) 0;
  border-right: 1px solid var(--border);
}

.step-item:last-child {
  border-right: none;
}

.step-item + .step-item {
  padding-left: var(--spacing-md);
}

.step-item:not(:last-child) {
  padding-right: var(--spacing-md);
}

.step-tag {
  font-family: var(--mono);
  font-size: var(--typography-size-micro);
  text-transform: uppercase;
  letter-spacing: var(--typography-letterSpacing-caps);
  color: var(--text-3);
  margin-bottom: var(--spacing-2xs);
}

.step-name {
  font-family: var(--sans);
  font-size: var(--typography-size-subtitle);
  font-weight: var(--typography-weight-medium);
  color: var(--text-1);
  margin-bottom: var(--spacing-2xs);
}

.step-desc {
  font-size: var(--typography-size-body);
  color: var(--text-2);
  line-height: var(--typography-lineHeight-relaxed);
}

/* ─── STATUS TABLE ─── */
.status-table {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-size: var(--typography-size-body);
  margin-top: var(--spacing-lg);
  background: var(--color-background-surface);
}

.status-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--border);
  gap: var(--spacing-sm);
}

.status-row:last-child {
  border-bottom: none;
}

.status-row-label {
  color: var(--text-1);
  font-weight: var(--typography-weight-medium);
}

.status-row-sub {
  font-size: var(--typography-size-caption);
  color: var(--text-2);
  margin-top: var(--spacing-3xs);
  line-height: var(--typography-lineHeight-relaxed);
}

.tag {
  font-family: var(--mono);
  font-size: var(--typography-size-micro);
  text-transform: uppercase;
  letter-spacing: var(--typography-letterSpacing-mono);
  padding: var(--spacing-3xs) var(--spacing-2xs);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-live   { background: var(--color-status-success); color: var(--color-status-successText); border: 1px solid var(--color-border-default); }
.tag-wip    { background: var(--color-status-warning); color: var(--color-status-warningText); border: 1px solid var(--color-status-warningBorder); }
.tag-soon   { background: var(--color-background-muted); color: var(--text-2); border: 1px solid var(--border); }
.tag-neutral { background: var(--color-background-surface); color: var(--text-2); border: 1px solid var(--border); }

/* ─── FOOTNOTE ─── */
.footnote {
  margin-top: var(--spacing-md);
  font-size: var(--typography-size-caption);
  color: var(--text-2);
  line-height: var(--typography-lineHeight-relaxed);
  max-width: 560px;
}

/* ─── FOOTER ─── */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: var(--spacing-md) 0;
}

footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.footer-brand {
  font-family: var(--serif);
  font-size: var(--typography-size-caption);
  color: var(--text-3);
}

.footer-brand a {
  color: var(--text-2);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-links a {
  font-family: var(--mono);
  font-size: var(--typography-size-micro);
  text-transform: uppercase;
  letter-spacing: var(--typography-letterSpacing-mono);
  color: var(--text-3);
  text-decoration: none;
  transition: color var(--motion-duration-medium) var(--motion-easing-standard);
}

.footer-links a:hover {
  color: var(--text-1);
}

/* ─── LANGUAGE CHOOSER (root page) ─── */
.lang-choice {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

/* ─── ANIMATIONS ─── */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  html { scroll-behavior: auto; }
}

/* ─── RESPONSIVE ─── */
@media (max-width: 600px) {
  .container { padding: 0 var(--spacing-sm); }
  nav { gap: var(--spacing-sm); }
  nav a.nav-secondary { display: none; }
  .hero { padding: var(--spacing-xl) 0 var(--spacing-lg); }
  section { padding: var(--spacing-xl) 0; }
  .steps-grid { grid-template-columns: 1fr; }
  .step-item { border-right: none; border-bottom: 1px solid var(--border); padding-right: 0; }
  .step-item:not(:last-child) { padding-right: 0; }
  .step-item:last-child { border-bottom: none; }
  .step-item + .step-item { padding-left: 0; }
  .status-row { grid-template-columns: 1fr; padding: var(--spacing-sm); }
  .status-row .tag { justify-self: start; grid-row: 1; }
}