@font-face {
  font-family: "Vellink WenKai";
  src: url("/assets/fonts/lxgw-wenkai-subset.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Vellink Hand";
  src: url("/assets/fonts/zhi-mang-xing-subset.woff2") format("woff2");
  font-display: swap;
}

:root {
  color-scheme: light;
  --paper: #fbf7ee;
  --paper-warm: #f5ecdf;
  --paper-deep: #eadbc8;
  --ink: #25211d;
  --ink-soft: #6d635a;
  --ink-faint: rgba(55, 47, 40, 0.28);
  --rule: rgba(63, 53, 45, 0.19);
  --accent: #a54531;
  --reply: #2e7d59;
  --shadow: 0 22px 72px rgba(48, 38, 30, 0.17);
  font-family: "Vellink WenKai", "Kaiti SC", serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  min-width: 280px;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-touch-callout: none;
}

.paper-app,
.paper-app *,
dialog,
dialog * {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.paper-app,
.paper-controls,
.paper-control,
dialog button,
dialog a {
  touch-action: none;
}

button,
a { color: inherit; font: inherit; -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }

[data-en] { display: none; }
html[data-language="en"] [data-en] { display: inline; }
html[data-language="en"] [data-zh] { display: none; }

button:focus-visible,
a:focus-visible,
canvas:focus-visible {
  outline: 2px solid rgba(165, 69, 49, 0.72);
  outline-offset: 2px;
}

.paper-app {
  position: relative;
  width: 100%;
  height: 100dvh;
  min-height: 28rem;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 48% 34%, rgba(255, 255, 255, 0.78), transparent 48%),
    linear-gradient(103deg, rgba(97, 68, 39, 0.025), transparent 36%, rgba(97, 68, 39, 0.02)),
    var(--paper);
}

.paper-app::after {
  position: absolute;
  z-index: 20;
  inset: 0;
  content: "";
  pointer-events: none;
  opacity: 0.16;
  background-image:
    radial-gradient(circle at 18% 32%, rgba(72, 50, 30, 0.1) 0 0.55px, transparent 0.8px),
    radial-gradient(circle at 78% 62%, rgba(72, 50, 30, 0.07) 0 0.5px, transparent 0.75px);
  background-size: 13px 17px, 19px 11px;
  mix-blend-mode: multiply;
}

.paper-app:fullscreen,
.paper-app.is-fullscreen {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
}

.paper-stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

.paper-app.is-gated .paper-stage,
.paper-app.is-gated .paper-brand,
.paper-app.is-gated .paper-controls {
  pointer-events: none;
  filter: blur(1.5px);
}

.ink-canvas {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

.paper-placeholder {
  position: absolute;
  z-index: 1;
  top: 43%;
  left: 50%;
  max-width: 80vw;
  margin: 0;
  color: var(--ink-faint);
  font-family: "Vellink Hand", "Vellink WenKai", cursive;
  font-size: clamp(2rem, 4.2vw, 3.8rem);
  text-align: center;
  transform: translate(-50%, -50%) rotate(-2deg);
  transition: opacity 180ms ease;
  pointer-events: none;
}

.paper-placeholder.is-hidden { opacity: 0; }

.paper-reply {
  position: absolute;
  z-index: 3;
  top: var(--reply-top, 32%);
  left: 50%;
  width: min(44rem, calc(100% - 11rem));
  margin: 0;
  color: var(--reply);
  font-family: "Vellink WenKai", "Kaiti SC", serif;
  font-size: clamp(1.18rem, 2vw, 1.6rem);
  line-height: 1.8;
  letter-spacing: 0.01em;
  white-space: pre-wrap;
  transform: translateX(-50%);
  opacity: 1;
  transition: opacity 700ms ease;
  pointer-events: none;
}

.paper-reply:empty { display: none; }
.paper-reply.is-fading { opacity: 0; transition-duration: 1.2s; }

.paper-message {
  position: absolute;
  z-index: 5;
  right: clamp(1rem, 2.2vw, 2.2rem);
  bottom: max(0.75rem, env(safe-area-inset-bottom));
  max-width: min(36rem, 72vw);
  margin: 0;
  color: rgba(68, 59, 51, 0.52);
  text-align: right;
  font-size: 0.72rem;
  letter-spacing: 0.01em;
  pointer-events: none;
}

.paper-message.is-error { color: #8d3d2e; }
.paper-app.is-processing .paper-stage { cursor: progress; }

.paper-brand {
  position: fixed;
  z-index: 12;
  top: max(0.72rem, env(safe-area-inset-top));
  left: max(0.85rem, env(safe-area-inset-left));
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  height: 2.7rem;
  color: rgba(37, 33, 29, 0.66);
  font-size: 0.9rem;
  letter-spacing: 0.055em;
  line-height: 1;
  white-space: nowrap;
  pointer-events: none;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.paper-brand img {
  display: block;
  width: 2.15rem;
  height: 2.15rem;
  opacity: 0.88;
  -webkit-user-drag: none;
  user-select: none;
}

.paper-controls {
  position: fixed;
  z-index: 12;
  top: max(0.45rem, env(safe-area-inset-top));
  right: max(0.65rem, env(safe-area-inset-right));
  display: flex;
  align-items: stretch;
  height: 3.25rem;
}

.paper-control {
  min-width: 3.25rem;
  min-height: 3.25rem;
  border: 0;
  border-bottom: 1px solid transparent;
  padding: 0 0.9rem;
  color: rgba(37, 33, 29, 0.76);
  background: rgba(251, 247, 238, 0.7);
  box-shadow: none;
  backdrop-filter: blur(7px);
}

.paper-control + .paper-control { border-left: 1px solid var(--rule); }
.paper-control:hover { color: var(--ink); border-bottom-color: rgba(165, 69, 49, 0.45); }
.paper-control:active { background: rgba(234, 219, 200, 0.78); }

.quota-control { min-width: 4.3rem; }
.quota-control strong { color: var(--accent); font-size: 1.03rem; font-weight: 500; }
.quota-control [data-quota-unit] { color: var(--ink-soft); font-size: 0.72rem; }
.fullscreen-control { display: grid; place-items: center; padding: 0; }
.persona-control { min-width: 5.5rem; max-width: 13rem; text-align: right; }
.persona-control span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

dialog {
  max-width: calc(100vw - 2rem);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 0;
  background:
    radial-gradient(circle at 30% 18%, rgba(255, 255, 255, 0.7), transparent 45%),
    var(--paper);
  box-shadow: var(--shadow);
}

dialog::backdrop {
  background: rgba(42, 35, 29, 0.3);
  backdrop-filter: blur(4px);
}

.entry-dialog {
  position: fixed;
  width: min(37rem, calc(100vw - 2rem));
  margin: auto;
  padding: clamp(1.6rem, 4vw, 3.2rem);
  overflow: visible;
}

.entry-dialog[open]:not(:modal) {
  z-index: 200;
  top: 50%;
  transform: translateY(-50%);
}

.entry-mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 2.3rem;
  color: var(--paper);
  border-radius: 48% 52% 44% 56%;
  background: var(--ink);
  font-family: "Vellink Hand", cursive;
  font-size: 1.6rem;
  transform: rotate(-5deg);
}

.dialog-kicker {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-size: 0.69rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

dialog h1,
dialog h2 {
  margin: 0;
  font-size: clamp(1.75rem, 4.8vw, 3rem);
  font-weight: 400;
  line-height: 1.12;
}

.entry-copy { margin: 1.45rem 0 0; font-size: clamp(1rem, 2vw, 1.15rem); }
.entry-note { margin: 1rem 0 0; color: var(--ink-soft); font-size: 0.8rem; }
.entry-actions { display: flex; align-items: center; gap: 1.35rem; margin-top: 2.35rem; }

.entry-actions a,
.privacy-note a {
  color: var(--ink-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25rem;
}

.primary-button {
  min-height: 3.25rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 0.6rem 1.6rem;
  color: var(--paper);
  background: var(--ink);
}

.primary-button:hover { border-color: var(--accent); background: var(--accent); }

.paper-menu,
.persona-dialog { width: min(34rem, calc(100vw - 2rem)); padding: 1.5rem; }

.dialog-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.dialog-heading h2 { font-size: 2rem; }
.close-button { width: 2.75rem; height: 2.75rem; border: 1px solid var(--rule); border-radius: 50%; background: transparent; font-size: 1.35rem; }
.quota-copy { margin: 1.5rem 0 1rem; color: var(--ink-soft); }
.quota-copy strong { color: var(--accent); }

.input-mode-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  margin: 0 0 1rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0.9rem 0;
}

.input-mode-row[hidden] { display: none; }
.input-mode-row h3 { margin: 0; font-size: 0.9rem; font-weight: 500; }
.input-mode-row p { margin: 0.25rem 0 0; color: var(--ink-soft); font-size: 0.72rem; }

.input-mode-switch {
  min-width: 8.8rem;
  min-height: 2.75rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  color: var(--ink-soft);
  background: transparent;
  font-size: 0.78rem;
}

.input-mode-switch[aria-checked="true"] {
  color: var(--paper);
  border-color: var(--ink);
  background: var(--ink);
}

.paper-menu-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.paper-menu-actions button {
  min-height: 4rem;
  border: 0;
  border-right: 1px solid var(--rule);
  padding: 0.65rem;
  background: transparent;
}

.paper-menu-actions button:last-child { border-right: 0; }
.paper-menu-actions button:hover { background: var(--paper-warm); }

.privacy-note { padding: 1.2rem 0; color: var(--ink-soft); font-size: 0.8rem; }
.privacy-note p { margin: 0 0 0.5rem; }
.danger-actions { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.65rem 1rem; }
.danger-actions button { border: 0; border-bottom: 1px solid currentColor; padding: 0; color: #873a2c; background: transparent; font-size: 0.77rem; }

.persona-list { display: grid; grid-template-columns: 1fr 1fr; margin-top: 1.5rem; border-top: 1px solid var(--rule); border-left: 1px solid var(--rule); }
.persona-list button { position: relative; display: grid; min-height: 5rem; border: 0; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 0.85rem 2.4rem 0.8rem 1rem; background: transparent; text-align: left; font-size: 1.02rem; }
.persona-list button:hover { background: var(--paper-warm); }
.persona-list button[aria-selected="true"] { background: var(--paper-deep); }
.persona-list button[aria-selected="true"]::after { position: absolute; top: 50%; right: 1rem; content: "✓"; color: var(--accent); transform: translateY(-50%); }
.persona-list small { color: var(--ink-soft); font-size: 0.69rem; }
html[data-language="en"] .persona-list small { display: none; }
.persona-note { margin: 1rem 0 0; color: var(--ink-soft); font-size: 0.76rem; }

.confirm-dialog { width: min(31rem, calc(100vw - 2rem)); padding: 1.5rem; }
.confirm-dialog h2 { font-size: 1.65rem; }
.confirm-dialog p { color: var(--ink-soft); }
.confirm-dialog form { display: flex; justify-content: flex-end; gap: 0.65rem; margin-top: 1.5rem; }
.confirm-dialog form button { min-height: 2.7rem; border: 1px solid var(--rule); border-radius: 999px; padding: 0.45rem 1rem; background: transparent; }
.confirm-dialog .danger-button { color: var(--paper); border-color: #873525; background: #873525; }

@media (max-width: 800px) {
  .paper-brand { left: max(0.55rem, env(safe-area-inset-left)); }
  .paper-controls { right: max(0.35rem, env(safe-area-inset-right)); height: 3rem; }
  .paper-control { min-width: 3rem; min-height: 3rem; padding-inline: 0.72rem; }
  .quota-control { min-width: 3.85rem; }
  .persona-control { min-width: 4.8rem; max-width: 9.5rem; }
  .paper-reply { width: min(38rem, calc(100% - 4rem)); font-size: clamp(1.08rem, 4vw, 1.35rem); }
  .paper-message { right: 0.8rem; max-width: 84vw; font-size: 0.67rem; }
  .paper-menu-actions { grid-template-columns: 1fr; }
  .paper-menu-actions button { min-height: 3.2rem; border-right: 0; border-bottom: 1px solid var(--rule); }
  .paper-menu-actions button:last-child { border-bottom: 0; }
}

@media (max-width: 390px) {
  .paper-brand { top: max(0.55rem, env(safe-area-inset-top)); height: 2.6rem; }
  .paper-brand img { width: 2rem; height: 2rem; }
  .paper-brand span { display: none; }
  .paper-control { padding-inline: 0.55rem; }
  .quota-control { min-width: 3.55rem; }
  .persona-control { min-width: 4.25rem; max-width: 7.5rem; }
  .paper-reply { width: calc(100% - 2.5rem); }
  .paper-placeholder { font-size: 2.15rem; }
  .entry-dialog,
  .paper-menu,
  .persona-dialog { padding: 1.25rem; }
  .entry-mark { margin-bottom: 1.45rem; }
  .entry-actions { margin-top: 1.7rem; }
  .persona-list { grid-template-columns: 1fr; max-height: 52vh; overflow-y: auto; }
  .persona-list button { min-height: 4.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}