* { box-sizing: border-box; }

html { background: var(--color-bg-canvas); color: var(--color-text-primary); font-family: var(--font-sans); }
body { margin: 0; min-width: 20rem; background: var(--color-bg-canvas); }
button, input, textarea { font: inherit; }
button, input, textarea { min-height: var(--touch-target-min); }
button { cursor: pointer; }

.entry-skip {
  position: fixed; inset: var(--space-3) auto auto var(--space-3); z-index: var(--z-fixed);
  padding: var(--space-3) var(--space-4); background: var(--color-bg-surface); color: var(--color-link);
  transform: translateY(-200%); border-radius: var(--radius-md);
}
.entry-skip:focus { transform: none; }

.entry-page { width: min(100%, 96rem); margin: 0 auto; padding: clamp(0.75rem, 3vw, 2.5rem); }
.entry-split {
  display: grid; grid-template-columns: minmax(0, 3fr) minmax(21rem, 2fr);
  min-height: min(47rem, calc(100svh - 5rem)); border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-2xl); overflow: hidden; box-shadow: var(--shadow-editorial-hero);
}

.prologue-card {
  display: flex; flex-direction: column; justify-content: space-between; min-height: 37rem;
  padding: clamp(1.5rem, 4vw, 4rem); color: var(--color-editorial-hero-fg);
  background: var(--color-editorial-hero-bg);
}
.prologue-head, .prologue-card footer, .identity-head, .message-meta { display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); }
.entry-mark {
  display: grid; place-items: center; width: 2.75rem; height: 2.75rem; border: 1px solid var(--color-editorial-hero-rule);
  font: 700 1rem/1 var(--font-mono); border-radius: 50%;
}
.prologue-head time, .prologue-card footer { color: var(--color-editorial-hero-muted); font: 600 var(--font-size-xs)/1.5 var(--font-mono); letter-spacing: 0.08em; }
.prologue-copy { max-width: 48rem; padding: var(--space-16) 0; }
.entry-kicker { margin: 0 0 var(--space-4); font: 700 var(--font-size-xs)/1.4 var(--font-mono); letter-spacing: 0.12em; }
.prologue-copy h1 { margin: 0 0 var(--space-10); font-size: clamp(1rem, 2vw, 1.25rem); font-weight: 500; color: var(--color-editorial-hero-muted); }
.prologue-copy blockquote { margin: 0; max-width: 17ch; font-size: clamp(2.4rem, 5.2vw, 5.6rem); font-weight: 750; line-height: 1.08; letter-spacing: -0.045em; }
.prologue-copy > p:last-child { max-width: 36rem; margin: var(--space-8) 0 0; color: var(--color-editorial-hero-muted); font-size: var(--font-size-lg); line-height: var(--line-height-relaxed); }
.prologue-card footer { border-top: 1px solid var(--color-editorial-hero-rule); padding-top: var(--space-5); }

.identity-panel { display: flex; flex-direction: column; justify-content: center; padding: clamp(1.5rem, 4vw, 3.5rem); background: var(--color-bg-surface); }
.identity-head h2, .visitor-room h2 { margin: 0; font-size: clamp(1.65rem, 2.5vw, 2.4rem); letter-spacing: -0.035em; }
.theme-toggle { width: 2.75rem; border: 1px solid var(--color-border-default); border-radius: 50%; color: var(--color-text-primary); background: transparent; }
.identity-intro { margin: var(--space-6) 0 var(--space-8); color: var(--color-text-secondary); line-height: var(--line-height-relaxed); }
label { display: block; margin: 0 0 var(--space-2); font-weight: 650; }
label small { color: var(--color-text-muted); font-weight: 500; }
input, textarea {
  width: 100%; border: 1px solid var(--color-border-strong); border-radius: var(--radius-md);
  padding: 0.75rem 0.875rem; color: var(--color-text-primary); background: var(--field-bg);
}
input:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible { outline: var(--focus-width) solid var(--color-focus); outline-offset: 3px; }
#identity-hint, .privacy-note, .message-meta { color: var(--color-text-muted); font-size: var(--font-size-sm); line-height: var(--line-height-normal); }
#identity-hint { min-height: 1.5rem; margin: var(--space-3) 0 0; }
.form-status { min-height: 1.6rem; margin: var(--space-3) 0; color: var(--color-text-secondary); font-size: var(--font-size-sm); }
.form-status[data-tone="error"] { color: var(--color-danger-fg); }
.form-status[data-tone="success"] { color: var(--color-success-fg); }
.primary-action, .secondary-action {
  display: flex; align-items: center; justify-content: space-between; width: 100%; min-height: 3.25rem;
  border-radius: var(--radius-md); padding: 0 var(--space-5); font-weight: 700;
}
.primary-action { border: 1px solid var(--color-action-primary-bg); color: var(--color-action-primary-fg); background: var(--color-action-primary-bg); }
.primary-action:hover { background: var(--color-action-primary-hover); }
.secondary-action { justify-content: center; border: 1px solid var(--color-editorial-hero-bg); color: var(--color-editorial-hero-fg); background: var(--color-editorial-hero-bg); }
button[aria-busy="true"] { cursor: wait; opacity: 0.72; }
.privacy-note { margin: var(--space-6) 0 0; }

.visitor-room {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(20rem, 1.15fr); gap: clamp(2rem, 7vw, 7rem);
  margin-top: clamp(1rem, 3vw, 2.5rem); padding: clamp(1.5rem, 4vw, 4rem);
  border: 1px solid var(--color-editorial-note-border); border-radius: var(--radius-2xl);
  background: var(--color-editorial-note-bg); color: var(--color-editorial-note-fg);
}
.visitor-intro > p:last-child { max-width: 34rem; color: var(--color-editorial-note-muted); line-height: var(--line-height-relaxed); }
.message-form { display: grid; align-content: start; }
.message-form label:not(:first-child) { margin-top: var(--space-5); }
textarea { min-height: 8.5rem; resize: vertical; line-height: var(--line-height-relaxed); }
.message-meta { margin-top: var(--space-2); }

[data-theme="dark"] .identity-panel { background: var(--color-bg-surface); }

@media (max-width: 63.99rem) {
  .entry-page { padding: 0; }
  .entry-split { grid-template-columns: 1fr; border: 0; border-radius: 0; min-height: auto; }
  .prologue-card { min-height: clamp(24rem, 62svh, 34rem); padding: 1.5rem; }
  .prologue-copy { padding: 3rem 0; }
  .identity-panel { padding: 2rem 1.25rem max(2.5rem, calc(1.5rem + env(safe-area-inset-bottom))); }
  .visitor-room { grid-template-columns: 1fr; margin: 0; border-width: 1px 0 0; border-radius: 0; padding: 2.5rem 1.25rem; }
}

@media (max-width: 23.5rem) {
  .prologue-card footer span:last-child { display: none; }
  .prologue-copy blockquote { font-size: 2.35rem; }
  .identity-head { align-items: flex-start; }
}

@media (prefers-reduced-motion: no-preference) {
  .primary-action, .secondary-action, .theme-toggle { transition: background-color var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard); }
  .primary-action:active, .secondary-action:active { transform: translateY(1px); }
}