/* ==========================================================================
   The St. Petersburger, systeme spb- : faience et patrimoine hivernal.
   Le bleu gzhel profond est LE sujet du site : il est assume comme tel et
   documente dans GABARIT.md. Aucune police externe, aucun script, aucune
   animation gadget : transitions 150ms, dark-mode automatique, print.
   ========================================================================== */

:root {
  /* Palette : blanc porcelaine, bleu gzhel profond, or doux, encre. */
  --spb-porcelain: #f6f8fb;
  --spb-glaze: #ffffff;
  --spb-wash: #edf2f9;
  --spb-cobalt: #16355f;
  --spb-cobalt-deep: #0e2340;
  --spb-cobalt-bright: #2f62a8;
  --spb-gold: #a97e26;
  --spb-gold-soft: #d3b264;
  --spb-ink: #1d2433;
  --spb-ink-soft: #525d72;
  --spb-hairline: #c7d3e4;
  --spb-shadow: rgba(14, 35, 64, 0.14);

  /* Typographie : serif Iowan/Palatino pour la lecture, sans systeme pour le chrome. */
  --spb-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "URW Palladio L", Georgia, serif;
  --spb-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --spb-wrap: 72rem;
  --spb-column: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --spb-porcelain: #101520;
    --spb-glaze: #171d2b;
    --spb-wash: #121826;
    --spb-cobalt: #a9c5ea;
    --spb-cobalt-deep: #0b1526;
    --spb-cobalt-bright: #82abdb;
    --spb-gold: #c9a24b;
    --spb-gold-soft: #8a6f33;
    --spb-ink: #e7edf7;
    --spb-ink-soft: #a3aec4;
    --spb-hairline: #2b3650;
    --spb-shadow: rgba(0, 0, 0, 0.45);
  }
}

/* ---------- socle ---------- */

* { box-sizing: border-box; }

html {
  font-size: clamp(16px, 0.45vw + 14.5px, 19px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--spb-porcelain);
  color: var(--spb-ink);
  font-family: var(--spb-serif);
  line-height: 1.62;
}

::selection { background: #16355f; color: #f6f8fb; }

a {
  color: var(--spb-cobalt-bright);
  text-decoration: underline;
  text-decoration-color: var(--spb-gold-soft);
  text-underline-offset: 0.16em;
  transition: color 150ms ease, text-decoration-color 150ms ease, background-color 150ms ease;
}
a:hover { color: var(--spb-cobalt); text-decoration-color: var(--spb-cobalt); }

a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--spb-gold);
  outline-offset: 3px;
}

img { max-width: 100%; height: auto; }

.spb-skip {
  position: absolute;
  left: -100vw;
  top: 0;
  background: var(--spb-cobalt-deep);
  color: #f6f8fb;
  padding: 0.6rem 1rem;
  font-family: var(--spb-sans);
  z-index: 50;
}
.spb-skip:focus { left: 0; }

.spb-wrap {
  max-width: var(--spb-wrap);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

/* ---------- cornice (en-tete) ---------- */

.spb-cornice {
  background: var(--spb-glaze);
  border-bottom: 1px solid var(--spb-hairline);
  box-shadow: inset 0 -4px 0 -3px var(--spb-hairline);
}
.spb-cornice__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.6rem;
  padding-block: 0.9rem;
}
.spb-mark {
  font-family: var(--spb-serif);
  font-size: 1.22rem;
  letter-spacing: 0.04em;
  color: var(--spb-cobalt);
  text-decoration: none;
  white-space: nowrap;
}
.spb-mark b { font-weight: 600; }
.spb-mark span {
  display: block;
  font-family: var(--spb-sans);
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--spb-gold);
  margin-top: 0.15rem;
}
.spb-nav { margin-left: auto; }
.spb-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.spb-nav a {
  font-family: var(--spb-sans);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--spb-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.spb-nav a:hover { color: var(--spb-cobalt); border-bottom-color: var(--spb-gold); }

/* ---------- etiquette (heros typographique) ---------- */

.spb-etiquette {
  margin: clamp(1.6rem, 5vw, 3.4rem) auto;
  max-width: 58rem;
  text-align: center;
  border: 1px solid var(--spb-hairline);
  outline: 1px solid var(--spb-hairline);
  outline-offset: 6px;
  background: linear-gradient(180deg, var(--spb-glaze) 0%, var(--spb-wash) 100%);
  padding: clamp(2.2rem, 7vw, 4.6rem) clamp(1.2rem, 5vw, 4rem);
}
.spb-etiquette__kicker {
  font-family: var(--spb-sans);
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--spb-gold);
  margin: 0 0 1.1rem;
}
.spb-etiquette h1 {
  margin: 0;
  font-size: clamp(2.5rem, 8vw, 4.7rem);
  font-weight: 500;
  letter-spacing: 0.015em;
  line-height: 1.04;
  color: var(--spb-cobalt);
  font-variant-caps: small-caps;
}
.spb-etiquette__deck {
  margin: 1.2rem auto 0;
  max-width: 47ch;
  font-size: 1.04rem;
  color: var(--spb-ink-soft);
}
.spb-etiquette__verbes {
  margin: 1.6rem 0 0;
  font-family: var(--spb-sans);
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--spb-cobalt-bright);
}
.spb-orn {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--spb-gold);
}
.spb-orn::before, .spb-orn::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--spb-hairline);
}
.spb-orn svg { width: 2.1rem; height: 2.1rem; flex: none; }
.spb-etiquette .spb-orn { margin-block: 0.4rem; }
.spb-orn--solo { justify-content: center; }
.spb-orn--solo::before, .spb-orn--solo::after { flex: 0 0 3.4rem; }

/* ---------- sections et bandeaux ---------- */

.spb-section { padding-block: clamp(1.8rem, 5vw, 3.2rem); }
.spb-section--wash { background: var(--spb-wash); border-block: 1px solid var(--spb-hairline); }
.spb-bandeau {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.4rem;
  border-bottom: 1px solid var(--spb-ink);
  padding-bottom: 0.55rem;
  margin-bottom: clamp(1.2rem, 3vw, 2rem);
}
.spb-bandeau h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--spb-cobalt-deep);
}
@media (prefers-color-scheme: dark) {
  .spb-bandeau h2 { color: var(--spb-ink); }
}
.spb-bandeau__note {
  margin: 0 0 0 auto;
  font-family: var(--spb-sans);
  font-size: 0.8rem;
  color: var(--spb-ink-soft);
  font-style: italic;
}

/* ---------- vitrine : grille asymetrique des rubriques ---------- */

.spb-shelf {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2.6vw, 1.7rem);
  list-style: none;
  margin: 0;
  padding: 0;
}
.spb-piece {
  background: var(--spb-glaze);
  border: 1px solid var(--spb-hairline);
  display: flex;
  flex-direction: column;
  transition: transform 150ms ease, box-shadow 150ms ease;
}
.spb-piece:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px var(--spb-shadow);
}
.spb-piece--7 { grid-column: span 7; }
.spb-piece--5 { grid-column: span 5; }
.spb-piece--4 { grid-column: span 4; }
.spb-piece--6 { grid-column: span 6; }
.spb-piece--12 { grid-column: span 12; }
.spb-piece--drop1 { margin-top: 2.6rem; }
.spb-piece--drop2 { margin-top: -1.4rem; }
.spb-piece__frame { border-bottom: 1px solid var(--spb-hairline); }
.spb-piece__frame--portrait img { aspect-ratio: 4 / 3; }
.spb-piece__frame--paysage img { aspect-ratio: 16 / 9; }
.spb-piece__frame--carre img { aspect-ratio: 1 / 1; }
.spb-piece__frame--haut img { aspect-ratio: 5 / 4; }
.spb-piece__frame img { width: 100%; height: 100%; object-fit: cover; display: block; }
.spb-piece__body { padding: 0.9rem 1.1rem 1.2rem; }
.spb-piece__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
}
.spb-num {
  font-family: var(--spb-serif);
  font-size: 1.7rem;
  color: var(--spb-gold);
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--spb-gold-soft);
  line-height: 1.15;
}
.spb-piece h3 { margin: 0; font-size: 1.16rem; line-height: 1.3; }
.spb-piece h3 a { color: var(--spb-ink); text-decoration: none; }
.spb-piece h3 a:hover { color: var(--spb-cobalt); text-decoration: underline; text-decoration-color: var(--spb-gold); }
.spb-piece__desc {
  margin: 0.45rem 0 0;
  font-size: 0.92rem;
  color: var(--spb-ink-soft);
}
@media (max-width: 940px) {
  .spb-piece--7, .spb-piece--5, .spb-piece--4, .spb-piece--6 { grid-column: span 12; }
  .spb-piece--drop1, .spb-piece--drop2 { margin-top: 0; }
  .spb-piece__frame--paysage img, .spb-piece__frame--carre img, .spb-piece__frame--haut img { aspect-ratio: 16 / 9; }
}

/* ---------- registre date (flux d'articles) ---------- */

.spb-ledger {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.spb-entry {
  display: grid;
  grid-template-columns: 5.6rem 1fr;
  gap: 1rem;
  padding-block: 1.05rem;
  border-top: 1px solid var(--spb-hairline);
}
.spb-entry__img {
  width: 5.6rem;
  height: 4.2rem;
  object-fit: cover;
  border: 1px solid var(--spb-hairline);
  background: var(--spb-wash);
}
.spb-entry__date {
  margin: 0 0 0.2rem;
  font-family: var(--spb-sans);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--spb-gold);
}
.spb-entry h3 { margin: 0; font-size: 1.05rem; line-height: 1.32; }
.spb-entry h3 a { color: var(--spb-ink); text-decoration: none; }
.spb-entry h3 a:hover { color: var(--spb-cobalt); text-decoration: underline; text-decoration-color: var(--spb-gold); }
.spb-entry__desc { margin: 0.3rem 0 0; font-size: 0.88rem; color: var(--spb-ink-soft); }
@media (max-width: 820px) {
  .spb-ledger { grid-template-columns: 1fr; gap: 0; }
}

/* ---------- colophon d'accueil ---------- */

.spb-pagenote {
  max-width: 60rem;
  margin: 0 auto;
  font-size: 0.94rem;
  color: var(--spb-ink-soft);
  border-top: 1px solid var(--spb-hairline);
  padding-top: 1.1rem;
}

/* ---------- fil d'ariane ---------- */

.breadcrumb.spb-crumb {
  padding-block: 0.85rem;
  border-bottom: 1px solid var(--spb-hairline);
}
.spb-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--spb-sans);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}
.spb-crumb li { color: var(--spb-ink-soft); }
.spb-crumb li + li::before { content: "\203A"; color: var(--spb-gold); margin-right: 0.45rem; }
.spb-crumb a { color: var(--spb-ink-soft); text-decoration: none; }
.spb-crumb a:hover { color: var(--spb-cobalt); }
.spb-crumb [aria-current="page"] { color: var(--spb-cobalt); }

/* ---------- tete d'article et planche ---------- */

.spb-head { text-align: left; padding-top: clamp(1.6rem, 4vw, 2.6rem); }
.spb-head__kicker {
  font-family: var(--spb-sans);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--spb-gold);
  margin: 0 0 0.7rem;
}
.spb-head h1 {
  margin: 0;
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  line-height: 1.12;
  font-weight: 600;
  color: var(--spb-cobalt);
  max-width: 30ch;
}
@media (prefers-color-scheme: dark) {
  .spb-head h1 { color: var(--spb-ink); }
}
.spb-head__deck {
  margin: 0.9rem 0 0;
  font-size: 1.08rem;
  font-style: italic;
  color: var(--spb-ink-soft);
  max-width: 56ch;
}
.spb-marks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.3rem;
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0.55rem 0;
  border-block: 1px solid var(--spb-hairline);
  font-family: var(--spb-sans);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--spb-ink-soft);
}
.spb-marks a { color: var(--spb-ink-soft); text-decoration: none; }
.spb-marks a:hover { color: var(--spb-cobalt); }

.spb-plate { margin: clamp(1.2rem, 3.5vw, 2rem) 0 0; }
.spb-plate img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--spb-hairline);
  background: var(--spb-wash);
}
.spb-plate figcaption {
  font-family: var(--spb-sans);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--spb-ink-soft);
  padding-top: 0.45rem;
}

/* ---------- colonne de lecture, lettrines ---------- */

.spb-column {
  max-width: var(--spb-column);
  margin: clamp(1.6rem, 4vw, 2.4rem) auto 0;
  font-size: 1.02rem;
}
.spb-column > p:first-of-type::first-letter {
  float: left;
  font-size: 3.3em;
  line-height: 0.82;
  padding-right: 0.09em;
  padding-top: 0.06em;
  color: var(--spb-cobalt);
  font-weight: 600;
}
.spb-lede { font-size: 1.12rem; }
.spb-column h2 {
  margin: 2.1rem 0 0.6rem;
  font-size: 1.32rem;
  line-height: 1.25;
  color: var(--spb-cobalt);
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--spb-hairline);
}
@media (prefers-color-scheme: dark) {
  .spb-column h2 { color: var(--spb-ink); }
}
.spb-column p { margin: 0 0 1rem; }

/* ---------- tableaux, checklists, notes ---------- */

.spb-scroll {
  overflow-x: auto;
  border: 1px solid var(--spb-hairline);
  background: var(--spb-glaze);
  margin: 1.3rem 0 1.5rem;
  padding: 0.35rem;
}
.spb-table {
  width: 100%;
  min-width: 40rem;
  border-collapse: collapse;
  font-size: 0.88rem;
  font-family: var(--spb-sans);
  line-height: 1.45;
}
.spb-table caption {
  caption-side: top;
  text-align: left;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--spb-gold);
  padding: 0.4rem 0.4rem 0.5rem;
}
.spb-table th {
  text-align: left;
  font-weight: 600;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.08em;
  color: var(--spb-cobalt);
  border-bottom: 2px solid var(--spb-cobalt);
  padding: 0.5rem 0.6rem;
}
.spb-table td {
  border-bottom: 1px solid var(--spb-hairline);
  padding: 0.5rem 0.6rem;
  vertical-align: top;
}
.spb-table tbody tr:nth-child(even) { background: var(--spb-wash); }

.spb-check, .spb-mistakes {
  list-style: none;
  margin: 0.6rem 0 1.3rem;
  padding: 0;
}
.spb-check li, .spb-mistakes li {
  position: relative;
  padding-left: 1.7rem;
  margin-bottom: 0.55rem;
}
.spb-check li::before {
  content: "";
  position: absolute;
  left: 0.25rem;
  top: 0.55em;
  width: 0.52em;
  height: 0.52em;
  background: var(--spb-gold);
  transform: rotate(45deg);
}
.spb-mistakes li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.72em;
  width: 0.95em;
  height: 2px;
  background: var(--spb-cobalt-bright);
}

.spb-note {
  border-left: 3px solid var(--spb-gold);
  background: var(--spb-wash);
  padding: 0.9rem 1.2rem;
  margin: 1.6rem 0 0.6rem;
}
.spb-note p { margin: 0; font-style: italic; }

/* ---------- a lire ensuite ---------- */

.spb-next {
  max-width: var(--spb-column);
  margin: 2.2rem auto 0;
  border-top: 1px solid var(--spb-ink);
  padding-top: 0.9rem;
}
.spb-next h2 {
  font-family: var(--spb-sans);
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--spb-gold);
  margin: 0 0 0.6rem;
}
.spb-next ul { list-style: none; margin: 0; padding: 0; }
.spb-next li { margin-bottom: 0.5rem; font-size: 0.96rem; color: var(--spb-ink-soft); }

/* ---------- mosaque de rubrique ---------- */

.spb-mosaic {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: clamp(1rem, 2.4vw, 1.5rem);
}
.spb-tile {
  background: var(--spb-glaze);
  border: 1px solid var(--spb-hairline);
  transition: transform 150ms ease, box-shadow 150ms ease;
}
.spb-tile:hover { transform: translateY(-2px); box-shadow: 0 12px 26px var(--spb-shadow); }
.spb-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--spb-hairline);
}
.spb-tile__body { padding: 0.8rem 1rem 1.05rem; }
.spb-tile h3 { margin: 0; font-size: 1.05rem; line-height: 1.3; }
.spb-tile h3 a { color: var(--spb-ink); text-decoration: none; }
.spb-tile h3 a:hover { color: var(--spb-cobalt); text-decoration: underline; text-decoration-color: var(--spb-gold); }
.spb-tile p { margin: 0.35rem 0 0; font-size: 0.86rem; color: var(--spb-ink-soft); }

/* ---------- onglets de renvoi entre rubriques ---------- */

.spb-cross {
  max-width: var(--spb-column);
  margin: 1.6rem auto 0;
  font-size: 0.94rem;
  color: var(--spb-ink-soft);
}

/* ---------- pied (footring : bord non emaille) ---------- */

.spb-footring {
  margin-top: clamp(2.2rem, 6vw, 3.6rem);
  background: #0e2340;
  color: #dfe8f4;
}
.spb-footring a { color: #cfe0f5; text-decoration-color: rgba(211, 178, 100, 0.55); }
.spb-footring a:hover { color: #ffffff; text-decoration-color: #d3b264; }
.spb-footring__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1.6rem;
  padding-block: 2rem 1.4rem;
}
.spb-footring h2 {
  font-family: var(--spb-sans);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: #d3b264;
  margin: 0 0 0.6rem;
}
.spb-footring ul { list-style: none; margin: 0; padding: 0; }
.spb-footring li { margin-bottom: 0.4rem; font-size: 0.9rem; }
.spb-footring__base {
  border-top: 1px solid rgba(223, 232, 244, 0.22);
  padding-block: 0.9rem 1.1rem;
  font-family: var(--spb-sans);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: #9fb4d2;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}
.spb-footring .spb-orn { color: #d3b264; }
.spb-footring .spb-orn::before, .spb-footring .spb-orn::after { background: rgba(223, 232, 244, 0.22); }

/* ---------- impression ---------- */

@media print {
  :root {
    --spb-porcelain: #ffffff;
    --spb-glaze: #ffffff;
    --spb-wash: #f2f2f2;
    --spb-ink: #111111;
    --spb-ink-soft: #444444;
    --spb-hairline: #999999;
    --spb-cobalt: #16355f;
    --spb-cobalt-bright: #16355f;
  }
  .spb-cornice, .spb-footring, .spb-skip, .spb-orn { display: none; }
  body { font-size: 11pt; line-height: 1.5; }
  a { color: inherit; text-decoration: underline; }
  .spb-scroll { overflow: visible; }
  .spb-piece:hover, .spb-tile:hover { transform: none; box-shadow: none; }
}