/* ============================================================
   design-showroom — shell design system
   「意匠を陳列する書庫」: 暖かい漆黒 + シャンパンの差し色 + 多層シャドウ。
   各デザインスタディ本体の CSS はここに含めない (studies/<id>/styles.css)。
   ============================================================ */

/* ---------- Fonts (self-hosted, CDN 非依存) ---------- */
@font-face {
  font-family: "Bricolage Grotesque";
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url("/fonts/bricolage.woff2") format("woff2");
}

/* ---------- Tokens ---------- */
:root {
  /* canvas / ink */
  --bg: #0b0a0c;
  --ink: #f4f1ea;
  --muted: #9d958a;
  --faint: #6c655d;

  /* champagne accent */
  --accent: #e9d5a6;
  --accent-deep: #c9ad6e;

  /* surfaces & lines */
  --surface: rgba(255, 255, 255, 0.026);
  --surface-2: rgba(255, 255, 255, 0.045);
  --line: rgba(255, 255, 255, 0.09);
  --line-soft: rgba(255, 255, 255, 0.055);
  --hi: rgba(255, 255, 255, 0.06); /* top inset highlight */

  /* radii */
  --r-card: 20px;
  --r-panel: 16px;
  --r-btn: 12px;
  --r-pill: 999px;

  /* shadows (multi-layer) */
  --sh-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
  --sh-md: 0 2px 6px rgba(0, 0, 0, 0.4), 0 10px 24px -10px rgba(0, 0, 0, 0.55);
  --sh-lg: 0 1px 2px rgba(0, 0, 0, 0.5), 0 24px 60px -16px rgba(0, 0, 0, 0.7),
    0 12px 28px -12px rgba(0, 0, 0, 0.55);
  --sh-accent: 0 6px 22px -8px hsl(43 60% 55% / 0.4);

  /* type */
  --font-display: "Bricolage Grotesque", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", sans-serif;
  --font-body: ui-sans-serif, -apple-system, "SF Pro Text", "Helvetica Neue",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  --maxw: 1320px;
  --gap: clamp(0.85rem, 1.6vw, 1.4rem);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scrollbar-color: var(--line) transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* atmospheric background: warm glow + cool depth + faint grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(58% 42% at 12% -6%, hsl(43 55% 45% / 0.16), transparent 70%),
    radial-gradient(46% 40% at 102% 8%, hsl(20 50% 50% / 0.1), transparent 70%),
    radial-gradient(70% 60% at 50% 120%, hsl(220 40% 30% / 0.14), transparent 70%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection {
  background: hsl(43 60% 60% / 0.3);
}

/* ---------- Shell / Header ---------- */
.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1rem, 4vw, 2.5rem) 5rem;
}

.shell__head {
  margin-bottom: clamp(2rem, 5vw, 3.25rem);
}

.shell__kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
  opacity: 0.9;
}

.shell__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8vw, 5.5rem);
  line-height: 0.92;
  letter-spacing: -0.035em;
  margin: 0 0 1.1rem;
  background: linear-gradient(180deg, var(--ink) 30%, #b8b0a4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.shell__lead {
  max-width: 48ch;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.4vw, 1.08rem);
  margin: 0;
}

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2.25rem);
  padding: 1.1rem 1.35rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  box-shadow: var(--sh-md), inset 0 1px 0 var(--hi);
  backdrop-filter: blur(10px);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.filter-group__legend {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--faint);
}

.filter-group__options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  font-size: 0.83rem;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  box-shadow: var(--sh-sm), inset 0 1px 0 var(--hi);
  cursor: pointer;
  user-select: none;
  transition: transform 0.16s ease, border-color 0.16s, color 0.16s,
    background 0.16s, box-shadow 0.16s;
}

.chip:hover {
  transform: translateY(-1px);
  color: var(--ink);
  border-color: var(--line);
}

.chip input {
  appearance: none;
  width: 0;
  height: 0;
  margin: 0;
  position: absolute;
}

.chip:has(input:checked) {
  color: #1a1610;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  border-color: transparent;
  box-shadow: var(--sh-accent), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  font-weight: 600;
}

/* ---------- Grid ---------- */
#showroom-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 290px), 1fr));
  gap: var(--gap);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--sh-md), inset 0 1px 0 var(--hi);
  transition: transform 0.22s cubic-bezier(0.2, 0.7, 0.3, 1),
    box-shadow 0.22s, border-color 0.22s;
  view-transition-name: var(--vt-name);
  animation: card-in 0.5s cubic-bezier(0.2, 0.7, 0.3, 1) both;
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.985);
  }
}

.card:hover {
  transform: translateY(-5px);
  border-color: hsl(var(--hue, 40) 40% 55% / 0.45);
  box-shadow: var(--sh-lg);
}

.card__preview {
  position: relative;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: flex-end;
  padding: 0.85rem 1rem;
  background: #111014;
  overflow: hidden;
}

.card__preview-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.card:hover .card__preview-img {
  transform: scale(1.04);
}

.card__preview::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 40%, rgba(255, 255, 255, 0.14) 50%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.6s ease;
}

.card:hover .card__preview::after {
  transform: translateX(120%);
}

.card__preview-tone {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.82);
  padding: 0.2rem 0.55rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--r-pill);
  background: rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(4px);
}

.card__body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.05rem 1.15rem 1.25rem;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0;
}

.card__summary {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.2rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.14rem 0.5rem;
  background: rgba(0, 0, 0, 0.2);
}

.tag--industry {
  color: var(--accent);
  border-color: hsl(43 50% 60% / 0.3);
}

/* 無限スクロール番兵 (不可視) */
.sentinel {
  grid-column: 1 / -1;
  height: 1px;
}

/* 空状態 */
.empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 5rem 1rem;
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.01em;
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 5, 7, 0.72);
  backdrop-filter: blur(6px) saturate(120%);
  display: grid;
  place-items: center;
  padding: clamp(0.75rem, 3vw, 2.5rem);
  z-index: 50;
  view-transition-name: modal;
  animation: overlay-in 0.2s ease both;
}

@keyframes overlay-in {
  from {
    opacity: 0;
  }
}

.modal {
  position: relative;
  width: min(980px, 100%);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #1a181c, #131115);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  overflow: hidden;
  box-shadow: var(--sh-lg), inset 0 1px 0 var(--hi);
  animation: modal-in 0.32s cubic-bezier(0.2, 0.7, 0.3, 1) both;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.97);
  }
}

.modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.4rem;
  border-bottom: 1px solid var(--line-soft);
}

.modal__head strong {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.modal__tabs {
  display: flex;
  gap: 0.3rem;
  padding: 0.7rem 1.4rem 0;
}

.modal__tab {
  font: inherit;
  font-size: 0.82rem;
  padding: 0.45rem 0.95rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px 10px 0 0;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.modal__tab:hover {
  color: var(--ink);
}

.modal__body {
  flex: 1;
  overflow: auto;
  padding: 1.25rem 1.4rem 1.6rem;
}

.modal__preview {
  width: 100%;
  height: 60vh;
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  background: #fff;
  box-shadow: var(--sh-md);
}

.modal__code {
  margin: 0;
  white-space: pre;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: #d7d2c8;
  background: #0c0b0e;
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  padding: 1.1rem 1.2rem;
  box-shadow: inset 0 1px 0 var(--hi);
}

.modal__close {
  font: inherit;
  font-size: 1.05rem;
  display: grid;
  place-items: center;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--ink);
  width: 2.2rem;
  height: 2.2rem;
  cursor: pointer;
  box-shadow: var(--sh-sm), inset 0 1px 0 var(--hi);
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}

.modal__close:hover {
  transform: rotate(90deg);
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--muted);
}

.modal__panel--desc a,
.modal__panel--desc p {
  font-size: 0.92rem;
}

.modal__panel--desc a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid hsl(43 50% 60% / 0.4);
}

/* CSS ラジオによるタブ切替 (JS なし)。:has() は Chrome/Safari/Firefox 対応。 */
.modal__radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.modal__panel {
  display: none;
}

.modal:has(#mtab-preview:checked) .modal__panel--preview,
.modal:has(#mtab-code:checked) .modal__panel--code,
.modal:has(#mtab-desc:checked) .modal__panel--desc {
  display: block;
}

.modal:has(#mtab-preview:checked) label[for="mtab-preview"],
.modal:has(#mtab-code:checked) label[for="mtab-code"],
.modal:has(#mtab-desc:checked) label[for="mtab-desc"] {
  color: var(--ink);
  background: var(--surface-2);
  border-color: var(--line-soft);
  border-bottom-color: transparent;
}

/* ---------- View Transitions ---------- */
/* 非対応ブラウザでは単にフラグメントが差し替わる (グレースフルデグレード)。 */
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.28s;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card,
  .modal,
  .modal-overlay {
    animation: none;
  }
}