/* 问道馆 · 纸墨文脉（融合 specs/ui/prototype.html） */
:root {
  --paper: #f6f1e6;
  --paper-2: #efe8d8;
  --paper-3: #e9e1cf;
  --ink: #2a2824;
  --ink-2: #6d665a;
  --ink-3: #a59c8a;
  --cinnabar: #a63a2b;
  --line: #ddd4c1;
  --line-2: #cbc1aa;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --field-line: 1.45;
  --field-pad-y: 11px;
  --field-max-lines: 6;
}
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  background-image:
    radial-gradient(circle at 20% 10%, rgba(178, 160, 120, 0.05) 0, transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(178, 160, 120, 0.06) 0, transparent 40%),
    repeating-linear-gradient(0deg, transparent 0 2px, rgba(120, 105, 70, 0.012) 2px 3px);
}
button { font-family: var(--serif); cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }

.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; background: var(--cinnabar); color: #f6f1e6;
  border-radius: 5px; font-size: 15px; letter-spacing: 2px; line-height: 1.05;
  writing-mode: vertical-rl; padding: 2px;
  box-shadow: 0 1px 0 rgba(143, 47, 34, 0.5) inset;
  font-weight: 700;
}
.intro-fig {
  width: 118px; height: auto; margin-bottom: 6px; display: block;
}
.figure { width: 34px; height: auto; display: block; }

/* ---- 引言页 ---- */
.page-intro {
  min-height: 100%; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 32px 24px; text-align: center;
}
.brand { display: flex; align-items: center; gap: 12px; justify-content: center; margin-bottom: 4px; }
.brand h1 { font-size: 24px; letter-spacing: 6px; font-weight: 700; }
.brand-sub { font-size: 12px; color: var(--ink-3); letter-spacing: 4px; margin-bottom: 26px; }
.intro-card {
  background: var(--paper-2); border: 1px solid var(--line); border-radius: 10px;
  padding: 20px 18px; max-width: 420px; width: 100%; text-align: left; margin-bottom: 14px;
}
.intro-card h2 { font-size: 17px; margin-bottom: 8px; letter-spacing: 1px; }
.intro-card p { font-size: 13.5px; line-height: 1.9; color: var(--ink-2); }
.identity {
  border-left: 3px solid var(--cinnabar); background: rgba(166, 58, 43, 0.06);
  padding: 10px 12px; margin-top: 12px; font-size: 13px !important;
  color: var(--ink) !important; line-height: 1.8 !important;
}
.disclaim { font-size: 11.5px; color: var(--ink-3); margin-bottom: 22px; max-width: 420px; line-height: 1.7; }
.btn-enter {
  display: inline-block; background: var(--cinnabar); color: #f6f1e6;
  font-size: 16px; letter-spacing: 6px; padding: 13px 46px; border-radius: 8px;
  box-shadow: 0 2px 10px rgba(166, 58, 43, 0.28); transition: transform 0.12s;
}
.btn-enter:active { transform: scale(0.97); }
.intro-foot { margin-top: 22px; font-size: 11px; color: var(--ink-3); letter-spacing: 1px; }
.intro-foot a { color: var(--ink-2); border-bottom: 1px solid var(--line-2); }

/* ---- 对话页壳 ---- */
.page-chat { height: 100%; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 10px; padding: 12px 16px;
  border-bottom: 1px solid var(--line); background: rgba(246, 241, 230, 0.92);
  backdrop-filter: blur(6px); position: sticky; top: 0; z-index: 5;
}
.topbar .who { flex: 1; min-width: 0; }
.topbar .who b { font-size: 15.5px; letter-spacing: 2px; display: block; }
.topbar .who span { font-size: 10.5px; color: var(--cinnabar); letter-spacing: 1px; }
.topbar .actions { display: flex; align-items: center; gap: 8px; }
/* 顶栏「新会话」与反馈「送出」同规格，避免一大一小 */
.btn-quiet {
  font-size: 12px; letter-spacing: 1px; line-height: 1;
  color: var(--ink-2); border: 1px solid var(--line);
  padding: 0 11px; height: 28px; border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
}
.btn-quiet:active { border-color: var(--cinnabar); color: var(--cinnabar); }
.btn-quiet:disabled { opacity: 0.5; cursor: default; }
.topbar a.home-seal { flex-shrink: 0; }

#msgs {
  flex: 1; overflow-y: auto; padding: 20px 16px 12px;
  max-width: 720px; width: 100%; margin: 0 auto;
}
.row { display: flex; margin-bottom: 18px; }
.row.user { justify-content: flex-end; }
.bubble {
  max-width: 86%; border-radius: 10px; padding: 11px 14px;
  font-size: 15px; line-height: 1.85; white-space: pre-wrap; word-break: break-word;
}
.row.user .bubble {
  background: var(--paper-3); border: 1px solid var(--line-2);
  border-radius: 10px 10px 3px 10px; color: var(--ink);
}
.row.ghost .bubble {
  background: transparent; border-left: 2px solid var(--cinnabar); border-radius: 2px;
  padding: 6px 0 6px 14px; max-width: 92%;
}
.row.ghost.tier-F1 .bubble { font-size: 16.5px; letter-spacing: 0.3px; }
.row.ghost.tier-F3 .bubble { font-size: 14.5px; line-height: 1.95; }
.cursor {
  display: inline-block; width: 8px; height: 16px; background: var(--ink);
  vertical-align: -2px; animation: blink 0.8s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: -8px 0 12px 16px; }
.meta .form-tag { font-size: 10px; color: var(--ink-3); letter-spacing: 1px; }

.fb-row {
  display: flex; align-items: center; gap: 8px; margin: -4px 0 12px 16px;
  opacity: 0; animation: fbIn 0.4s ease 0.35s forwards;
}
@keyframes fbIn { to { opacity: 1; } }
.fb-hint { font-size: 11px; color: var(--ink-3); letter-spacing: 1px; }
.fb { display: inline-flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.fb-votes { display: inline-flex; gap: 2px; }
.fb button {
  padding: 6px; border-radius: 6px; line-height: 0; cursor: pointer;
  border: none; background: none;
}
.fb button:hover svg, .fb button:focus-visible svg { stroke: var(--cinnabar); }
.fb svg {
  width: 20px; height: 20px; stroke: var(--ink-2); fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.fb button.on svg { stroke: var(--cinnabar); fill: rgba(166, 58, 43, 0.12); }
.fb button:disabled { opacity: 0.55; cursor: default; }
.fb-note-wrap { display: none; width: min(320px, 100%); gap: 6px; align-items: center; }
.fb-note-wrap.on { display: flex; }
.fb-note-wrap input {
  flex: 1; font-size: 12px; font-family: var(--serif); color: var(--ink);
  padding: 0 8px; height: 28px; border: 1px solid var(--line); background: var(--paper-2); border-radius: 6px; outline: none;
}
.fb-note-wrap input:focus { border-color: var(--ink-3); }
.inputbar {
  display: flex; gap: 10px; align-items: flex-end;
  padding: 10px 14px 8px;
  border-top: 1px solid var(--line); background: rgba(246, 241, 230, 0.94);
  backdrop-filter: blur(6px); max-width: 720px; width: 100%; margin: 0 auto;
}
.inputbar .field {
  flex: 1; resize: none; overflow-y: auto;
  background: var(--paper-2); border: 1px solid var(--line-2); border-radius: 10px;
  padding: var(--field-pad-y) 14px; font-size: 15px; line-height: var(--field-line);
  font-family: var(--serif); color: var(--ink); outline: none;
  min-height: calc(var(--field-pad-y) * 2 + 1em * var(--field-line));
  max-height: calc(var(--field-pad-y) * 2 + 1em * var(--field-line) * var(--field-max-lines));
}
.inputbar .field:focus { border-color: var(--ink-3); }
.inputbar .send {
  width: 44px; height: 44px; flex-shrink: 0; background: var(--cinnabar); border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.inputbar .send:disabled { opacity: 0.5; cursor: default; }
.inputbar .send svg {
  width: 20px; height: 20px; stroke: #f6f1e6; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

.chat-foot {
  text-align: center; font-size: 11px; color: var(--ink-3); letter-spacing: 1px;
  padding: 0 16px calc(10px + env(safe-area-inset-bottom));
  line-height: 1.6;
}

.toast {
  position: fixed; bottom: 96px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: var(--paper); font-size: 12.5px;
  padding: 8px 16px; border-radius: 8px; opacity: 0; transition: opacity 0.25s;
  pointer-events: none; z-index: 9;
}
.toast.on { opacity: 0.92; }

@media (min-width: 760px) {
  #msgs, .inputbar { padding-left: 0; padding-right: 0; }
}