/* ── Reset 與全域 ──────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

@font-face {
  font-family: "Deck Serif";
  src: url("../assets/fonts/deck-serif-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Deck Serif";
  src: url("../assets/fonts/deck-serif-700.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

@font-face {
  font-family: "Deck Sans";
  src: url("../assets/fonts/deck-sans-300.woff2") format("woff2");
  font-weight: 300;
  font-display: swap;
}

@font-face {
  font-family: "Deck Sans";
  src: url("../assets/fonts/deck-sans-700.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100dvh;
  font-family: "Deck Serif", "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  font-weight: 500;
  color: var(--ink);
  background:
    radial-gradient(120% 90% at 50% 0%, var(--linen) 40%, var(--linen-deep) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

/* 頂部 */
.site-header {
  padding: var(--space-3) var(--space-2) var(--space-2);
  text-align: center;
}

.site-title {
  font-size: var(--text-title);
  font-weight: 700;
  letter-spacing: 0.35em;
  text-indent: 0.35em; /* 抵銷最後一字的字距，讓置中真正置中 */
  color: var(--ink);
}

.site-title .title-orn {
  color: var(--gold-mid);
  letter-spacing: 0;
  text-indent: 0;
  padding: 0 0.4em;
  font-weight: 500;
}

.site-subtitle {
  margin-top: 0.4rem;
  font-size: var(--text-sm);
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--ink-faint);
}

/* 模式切換 */
.mode-switch {
  margin: var(--space-2) auto 0;
  display: inline-flex;
  gap: 0;
  border: 1px solid var(--gold-mid);
  border-radius: 999px;
  overflow: hidden;
  background: oklch(100% 0 0 / 0.35);
}

.mode-switch [role="tab"] {
  appearance: none;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  text-indent: 0.2em;
  color: var(--ink-soft);
  padding: 0.55em 1.5em;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out);
}

.mode-switch [role="tab"][aria-selected="true"] {
  background: linear-gradient(135deg, var(--gold-dark), var(--gold-mid) 55%, var(--gold-light));
  color: oklch(98% 0.01 90);
}

.mode-switch [role="tab"]:focus-visible {
  outline: 2px solid var(--gold-dark);
  outline-offset: -2px;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.view {
  flex: 1;
}

.view[hidden] {
  display: none;
}

.site-footer {
  padding: var(--space-2);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--ink-faint);
  letter-spacing: 0.15em;
}

button {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* 通用金色按鈕 */
.gold-btn {
  appearance: none;
  border: 1px solid var(--gold-mid);
  border-radius: 999px;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold-mid) 55%, var(--gold-light));
  color: oklch(98% 0.01 90);
  font: inherit;
  font-size: var(--text-base);
  letter-spacing: 0.25em;
  text-indent: 0.25em;
  padding: 0.6em 1.8em;
  cursor: pointer;
  box-shadow: var(--shadow-card-soft);
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), filter var(--dur-fast) var(--ease-out);
}

.gold-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.gold-btn:active {
  transform: translateY(0);
  filter: brightness(0.97);
}

.gold-btn:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.ghost-btn {
  appearance: none;
  border: 1px solid var(--gold-mid);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  text-indent: 0.2em;
  padding: 0.5em 1.4em;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out);
}

.ghost-btn:hover {
  background: oklch(100% 0 0 / 0.4);
}

/* 減少動態效果 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}