/* ============================================================
   Corvo Bianco — Site Stylesheet (self-contained)
   ============================================================
   Tokens, font locali, componenti, dark variant — tutto qui.
   Nessuna dipendenza esterna: il file gira su GitHub Pages
   senza connessione a Google Fonts.
   ============================================================ */

/* --- Font OFL locali (in assets/fonts/) --- */

@font-face {
  font-family: "Cardo";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/Cardo-Regular.ttf") format("truetype");
}
@font-face {
  font-family: "Cardo";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/Cardo-Italic.ttf") format("truetype");
}
@font-face {
  font-family: "Cardo";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/Cardo-Bold.ttf") format("truetype");
}

@font-face {
  font-family: "EB Garamond";
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url("../fonts/EBGaramond-VariableFont_wght.ttf") format("truetype-variations"),
       url("../fonts/EBGaramond-VariableFont_wght.ttf") format("truetype");
}
@font-face {
  font-family: "EB Garamond";
  font-style: italic;
  font-weight: 400 800;
  font-display: swap;
  src: url("../fonts/EBGaramond-Italic-VariableFont_wght.ttf") format("truetype-variations"),
       url("../fonts/EBGaramond-Italic-VariableFont_wght.ttf") format("truetype");
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 100 700;
  font-stretch: 75% 100%;
  font-display: swap;
  src: url("../fonts/IBMPlexSans-VariableFont_wdth,wght.ttf") format("truetype-variations"),
       url("../fonts/IBMPlexSans-VariableFont_wdth,wght.ttf") format("truetype");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: italic;
  font-weight: 100 700;
  font-stretch: 75% 100%;
  font-display: swap;
  src: url("../fonts/IBMPlexSans-Italic-VariableFont_wdth,wght.ttf") format("truetype-variations"),
       url("../fonts/IBMPlexSans-Italic-VariableFont_wdth,wght.ttf") format("truetype");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/IBMPlexMono-Regular.ttf") format("truetype");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/IBMPlexMono-Italic.ttf") format("truetype");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/IBMPlexMono-Medium.ttf") format("truetype");
}

/* --- Design tokens --- */

:root {
  /* Palette sumi-e */
  --sumi: #1a1817;
  --sumi-soft: #3a3530;
  --kohaku: #6b5b4f;
  --washi: #f5f0e6;
  --rice: #faf7f0;
  --washi-deep: #ebe3d3;
  --vermilion: #b53127;
  --vermilion-soft: #d97264;
  --ink-line: rgba(26, 24, 23, 0.12);
  --ink-line-strong: rgba(26, 24, 23, 0.32);

  /* Tipografia */
  --font-display: "Cardo", "EB Garamond", Georgia, serif;
  --font-body:    "EB Garamond", Georgia, "Times New Roman", serif;
  --font-sans:    "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", "SF Mono", Consolas, monospace;

  /* Scala — rapporto perfetto quarto (1.333) */
  --fs-xs: 0.844rem;
  --fs-sm: 1rem;
  --fs-md: 1.25rem;
  --fs-lg: 1.667rem;
  --fs-xl: 2.222rem;
  --fs-2xl: 2.963rem;
  --fs-3xl: 3.95rem;
  --fs-4xl: 5.267rem;

  /* Spaziatura — base 8px */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;
  --space-9: 12rem;

  /* Misure */
  --measure-narrow: 32rem;
  --measure-base: 40rem;
  --measure-wide: 56rem;

  /* Transizioni */
  --t-base: 200ms ease;
  --t-slow: 400ms ease;

  color-scheme: light;
}

/* --- Dark variant — "inchiostro su carta notturna" --- */

[data-theme="dark"] {
  --washi: #16140f;
  --rice: #1f1c17;
  --washi-deep: #0e0c09;
  --sumi: #ede5d3;
  --sumi-soft: #bfb3a0;
  --kohaku: #8a7e6c;
  --vermilion: #c9483d;
  --vermilion-soft: #e08a7c;
  --ink-line: rgba(237, 229, 211, 0.12);
  --ink-line-strong: rgba(237, 229, 211, 0.32);

  color-scheme: dark;
}

/* --- Reset --- */

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

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--sumi);
  background-color: var(--washi);
  background-image:
    radial-gradient(circle at 20% 80%, rgba(107, 91, 79, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(107, 91, 79, 0.025) 0%, transparent 50%);
  transition: background-color var(--t-slow), color var(--t-slow);
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 20% 80%, rgba(237, 229, 211, 0.025) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(237, 229, 211, 0.02) 0%, transparent 50%);
}

img, svg { max-width: 100%; height: auto; display: block; }

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--ink-line);
  transition: border-color var(--t-base), color var(--t-base);
}
a:hover { color: var(--vermilion); border-color: var(--vermilion-soft); }

/* --- Tipografia --- */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  color: var(--sumi);
}
h1 { font-size: var(--fs-3xl); letter-spacing: -0.01em; }
h2 { font-size: var(--fs-xl);  letter-spacing: -0.005em; }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }

p {
  margin-bottom: var(--space-3);
  font-size: var(--fs-md);
  line-height: 1.7;
}
p:last-child { margin-bottom: 0; }
em, i { font-style: italic; }
strong { font-weight: 600; }

.motto {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--fs-lg);
  letter-spacing: 0.04em;
  color: var(--sumi);
}

.motto-display {
  font-family: var(--font-display);
  font-size: var(--fs-4xl);
  font-style: italic;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--sumi);
}

.section-label {
  font-family: var(--font-display);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--kohaku);
}

.caption {
  font-size: var(--fs-xs);
  color: var(--kohaku);
  font-style: italic;
}

/* --- Layout --- */

.container {
  width: 100%;
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.measure        { max-width: var(--measure-base);   margin: 0 auto; }
.measure-narrow { max-width: var(--measure-narrow); margin: 0 auto; }

section { padding: var(--space-7) 0; }
section + section { border-top: 1px solid var(--ink-line); }

/* --- Header --- */

.site-header {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--ink-line);
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
}
.brand-mark {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-style: italic;
  letter-spacing: 0.02em;
  border: none;
}
.brand-mark:hover { color: var(--vermilion); }

/* --- Hero --- */

.hero {
  padding: var(--space-9) 0 var(--space-7);
  text-align: center;
}

.hero-logo {
  max-width: 480px;
  margin: 0 auto var(--space-5);
}

/* Logo "dipinto" — l'SVG ha fill=currentColor, eredita color: var(--sumi).
   Sempre in palette, mai #fff. */
.cb-logo-paint {
  display: block;
  width: 100%;
  height: auto;
  color: var(--sumi);
  transition: color var(--t-slow);
}
.cb-logo-paint svg { width: 100%; height: auto; display: block; fill: currentColor; }

.hero-translation {
  color: var(--kohaku);
  font-size: var(--fs-md);
  letter-spacing: 0;
}

/* --- Manifesto --- */

.manifesto-section { padding: var(--space-7) 0; }
.manifesto-block {
  max-width: var(--measure-base);
  margin: 0 auto var(--space-7);
}
.manifesto-block:last-child { margin-bottom: 0; }
.manifesto-label { display: block; margin-bottom: var(--space-3); }
.manifesto-block h2 { margin-bottom: var(--space-4); }

/* --- Decalogo --- */

.decalogo {
  padding: var(--space-7) 0;
  background-color: var(--rice);
  transition: background-color var(--t-slow);
}
.decalogo-opening {
  max-width: var(--measure-base);
  margin: 0 auto var(--space-5);
  text-align: center;
}
.decalogo-opening .motto { display: block; margin-bottom: var(--space-2); }

.decalogo-list {
  max-width: var(--measure-base);
  margin: 0 auto;
  list-style: none;
}
.decalogo-item {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--ink-line);
  font-size: var(--fs-md);
  font-family: var(--font-display);
  line-height: 1.4;
}
.decalogo-item:last-child { border-bottom: none; }
.decalogo-left  { text-align: right; font-weight: 600; }
.decalogo-separator {
  font-style: italic;
  color: var(--kohaku);
  font-size: var(--fs-sm);
  white-space: nowrap;
}
.decalogo-right { text-align: left; color: var(--sumi-soft); }

.decalogo-closing {
  max-width: var(--measure-base);
  margin: var(--space-5) auto 0;
  text-align: center;
  font-style: italic;
  color: var(--kohaku);
  font-size: var(--fs-sm);
  line-height: 1.7;
}

/* --- Footer --- */

.site-footer {
  padding: var(--space-5) 0 var(--space-4);
  border-top: 1px solid var(--ink-line);
  text-align: center;
}
.site-footer .seal {
  display: inline-block;
  width: 24px;
  height: 24px;
  margin-bottom: var(--space-2);
  background-color: var(--vermilion);
  border-radius: 2px;
  opacity: 0.85;
}
.site-footer p {
  font-size: var(--fs-xs);
  color: var(--kohaku);
  margin: 0;
  line-height: 1.6;
}

/* --- Theme toggle (discreto, top-right) --- */

.theme-toggle {
  position: fixed;
  top: 14px;
  right: 18px;
  z-index: 100;
  font-family: var(--font-display);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--kohaku);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--ink-line);
  padding: 4px 2px;
  cursor: pointer;
  transition: color var(--t-base), border-color var(--t-base);
}
.theme-toggle:hover {
  color: var(--vermilion);
  border-color: var(--vermilion-soft);
}

/* --- Styleguide helpers --- */

.sg-section { padding: var(--space-6) 0; }
.sg-section + .sg-section { border-top: 1px solid var(--ink-line); }

.sg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
}
.sg-swatch { display: flex; flex-direction: column; gap: var(--space-1); }
.sg-swatch-color { height: 96px; border: 1px solid var(--ink-line); }
.sg-swatch-meta { font-size: var(--fs-xs); color: var(--kohaku); }
.sg-swatch-meta strong { display: block; color: var(--sumi); font-weight: 600; margin-bottom: 2px; }

.sg-type-row { padding: var(--space-3) 0; border-bottom: 1px solid var(--ink-line); }
.sg-type-row:last-child { border-bottom: none; }
.sg-type-label {
  font-size: var(--fs-xs);
  color: var(--kohaku);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.sg-spacing-bar { background-color: var(--vermilion); opacity: 0.7; height: 8px; margin-bottom: var(--space-1); }
.sg-note { font-style: italic; color: var(--kohaku); font-size: var(--fs-sm); margin-top: var(--space-3); }

/* --- Responsive --- */

@media (max-width: 720px) {
  html { font-size: 16px; }
  .hero { padding: var(--space-6) 0 var(--space-5); }
  .motto-display { font-size: var(--fs-2xl); }
  section { padding: var(--space-5) 0; }
  .manifesto-block { margin-bottom: var(--space-5); }
  .decalogo-item {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-1);
  }
  .decalogo-left, .decalogo-right { text-align: center; }
  .decalogo-separator { font-size: var(--fs-xs); }
}

/* --- Accessibilità --- */

:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}