/* 万物研究院 —— 纸质学术风：米白纸面 / 墨色正文 / 朱红印记 */
:root {
  --paper: #f6f4ef;
  --card: #fffefb;
  --ink: #1c2430;
  --ink-2: #3d4757;
  --ink-3: #6d7789;
  --line: #e2dcd0;
  --line-2: #efeae0;
  --red: #9b2c2c;
  --red-soft: #f7ecea;
  --gold: #9a7b45;
  --green: #2f6b4f;
  --blue: #2b5672;
  --top: 58px;
  --bottom: calc(58px + env(safe-area-inset-bottom));
  --r: 14px;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "SimSun", Georgia, serif;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 15px; line-height: 1.65;
  padding-top: calc(var(--top) + env(safe-area-inset-top));
  padding-bottom: var(--bottom);
  overflow-x: hidden;
}
.hidden { display: none !important; }
button { font-family: inherit; cursor: pointer; color: inherit; }
textarea, input, select { font-family: inherit; color: var(--ink); }

/* ================= 顶栏 ================= */
.bar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40;
  height: calc(var(--top) + env(safe-area-inset-top));
  padding: env(safe-area-inset-top) 14px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: rgba(246, 244, 239, .94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; border: none; background: none; padding: 0; text-align: left; }
.seal {
  width: 34px; height: 34px; flex: 0 0 auto; border-radius: 8px;
  background: var(--red); color: #fff5f2;
  font-family: var(--serif); font-size: 19px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.28);
}
.brand-txt { display: flex; flex-direction: column; line-height: 1.25; }
.brand-txt b { font-family: var(--serif); font-size: 16.5px; letter-spacing: .5px; }
.brand-txt i { font-style: normal; font-size: 10.5px; color: var(--ink-3); letter-spacing: .3px; }
.gear {
  width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line);
  background: var(--card); font-size: 15px; color: var(--ink-2);
}

/* ================= 视图 ================= */
.view { max-width: 720px; margin: 0 auto; padding: 14px 14px 28px; }
.view-title { font-family: var(--serif); font-size: 21px; margin: 4px 0 4px; }
.view-sub { font-size: 12.5px; color: var(--ink-3); margin: 0 0 14px; line-height: 1.7; }

/* ================= 首页 hero ================= */
.hero { padding: 6px 2px 2px; }
.hero-line {
  font-family: var(--serif); font-size: 20px; line-height: 1.55; margin: 0 0 6px;
  letter-spacing: .3px;
}
.hero-sub { font-size: 12.5px; color: var(--ink-3); line-height: 1.8; margin: 0 0 14px; }
.ask-box {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 12px 12px 8px; box-shadow: 0 4px 18px rgba(28, 36, 48, .04);
}
.ask-box textarea {
  width: 100%; border: none; outline: none; background: none; resize: none;
  font-size: 15.5px; line-height: 1.6; min-height: 52px; color: var(--ink);
}
.ask-box textarea::placeholder { color: #a9a294; }
.ask-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.ask-hint { font-size: 10.5px; color: var(--ink-3); }
.go {
  flex: 0 0 auto; border: none; border-radius: 10px; padding: 8px 20px;
  background: var(--ink); color: #fdfbf6; font-size: 14px; font-weight: 700;
  font-family: var(--serif); letter-spacing: 1px;
}
.go:active { transform: translateY(1px); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.quick { margin-top: 12px; }
.chip {
  border: 1px solid var(--line); background: var(--card); border-radius: 999px;
  padding: 7px 13px; font-size: 12.5px; color: var(--ink-2);
}
.chip.hot { border-color: rgba(155, 44, 44, .35); color: var(--red); background: var(--red-soft); font-weight: 700; }

/* ================= 区块 ================= */
.block {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 14px; margin-top: 14px;
}
.block-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.block-head b { font-family: var(--serif); font-size: 15.5px; letter-spacing: .4px; }
.block-head .count { font-size: 11.5px; color: var(--ink-3); }
.block-tip { font-size: 12px; color: var(--ink-3); line-height: 1.75; margin: 8px 0 10px; }
.link { border: none; background: none; color: var(--red); font-size: 12.5px; padding: 0; }
.frame-list { margin: 12px 0 0; padding: 0 0 0 2px; list-style: none; }
.frame-list li { display: flex; gap: 10px; padding: 9px 0; border-top: 1px dashed var(--line-2); }
.frame-list li:first-child { border-top: none; }
.frame-list b { flex: 0 0 64px; font-size: 12.5px; color: var(--red); font-weight: 700; }
.frame-list span { font-size: 12.5px; color: var(--ink-2); line-height: 1.7; }
.foot-note { font-size: 11px; color: #a29a8b; text-align: center; line-height: 1.9; margin: 22px 0 0; }

/* ================= 课题列表 ================= */
.proj-list { margin-top: 10px; display: flex; flex-direction: column; gap: 10px; }
.proj {
  text-align: left;
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 12px 11px;
  background: #fff; display: flex; flex-direction: column; gap: 6px;
}
.proj:active { background: #fbfaf6; }
.proj-top { display: flex; align-items: center; gap: 6px; }
.proj-type {
  font-size: 10.5px; padding: 1px 7px; border-radius: 5px;
  border: 1px solid rgba(155, 44, 44, .3); color: var(--red); background: var(--red-soft);
}
.proj-date { font-size: 10.5px; color: #a9a294; margin-left: auto; }
.proj-q { font-size: 14.5px; font-weight: 700; line-height: 1.5; }
.proj-c { font-size: 12.5px; color: var(--ink-3); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.proj-meta { display: flex; gap: 10px; font-size: 10.5px; color: #a9a294; }
.empty {
  border: 1px dashed var(--line); border-radius: 12px; padding: 22px 14px;
  text-align: center; font-size: 12.5px; color: var(--ink-3); line-height: 1.9;
}

/* ================= 详情 ================= */
.back { border: none; background: none; color: var(--ink-3); font-size: 13px; padding: 4px 0 10px; }
.q-head { padding: 0 2px 12px; }
.q-head .q { font-family: var(--serif); font-size: 20px; line-height: 1.5; margin: 0 0 8px; }
.q-tags { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.q-tags .tag {
  font-size: 10.5px; color: var(--ink-2); background: #f1ede4; border-radius: 5px; padding: 2px 7px;
}
.q-tags .tag.red { color: var(--red); background: var(--red-soft); }
.sec {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 13px 14px; margin-bottom: 10px;
}
.sec h3 {
  font-family: var(--serif); font-size: 14.5px; margin: 0 0 8px; letter-spacing: .3px;
  display: flex; align-items: center; gap: 8px;
}
.sec h3 em {
  font-style: normal; font-size: 10.5px; color: #fff; background: var(--ink);
  width: 18px; height: 18px; border-radius: 4px; display: inline-flex; align-items: center; justify-content: center;
}
.sec p { font-size: 13.5px; line-height: 1.85; margin: 0 0 8px; color: var(--ink-2); white-space: pre-wrap; }
.sec p:last-child { margin-bottom: 0; }
.sec.lead { border-left: 3px solid var(--red); }
.sec.lead p { font-size: 14.5px; color: var(--ink); }
.sec em.hl { font-style: normal; background: linear-gradient(transparent 62%, #f6e7c9 62%); padding: 0 2px; }
.stop { background: #fbf7ee; border: 1px solid #eadfc6; }
.stop h3 em { background: var(--gold); }

/* 变量表 */
.var-list { display: flex; flex-direction: column; gap: 7px; }
.var-row { display: flex; gap: 8px; align-items: flex-start; font-size: 12.5px; line-height: 1.7; }
.var-kind {
  flex: 0 0 auto; font-size: 10px; padding: 1px 6px; border-radius: 4px; margin-top: 2px;
  border: 1px solid var(--line); color: var(--ink-3); background: #f7f4ee;
}
.var-kind.ctrl { color: var(--green); border-color: #cfe3d6; background: #f0f7f2; }
.var-kind.semi { color: var(--blue); border-color: #cfdde6; background: #f0f5f8; }
.var-kind.un { color: #8a6d1a; border-color: #ecdcb4; background: #fdf8ea; }
.var-kind.ign { color: var(--red); border-color: #edcfcb; background: var(--red-soft); }
.var-name { flex: 0 0 auto; font-weight: 700; color: var(--ink); }
.var-note { color: var(--ink-3); }

/* 方案卡 */
.plan { border: 1px solid var(--line-2); border-radius: 10px; padding: 10px 11px; margin-bottom: 8px; background: #fff; }
.plan:last-child { margin-bottom: 0; }
.plan b { display: block; font-size: 12.5px; margin-bottom: 4px; }
.plan .strength { display: inline-block; font-size: 10px; color: var(--ink-3); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; margin: 0 0 5px; background: #f7f4ee; }
.plan .pn { font-size: 10.5px; color: #fff; border-radius: 4px; padding: 1px 6px; margin-right: 6px; background: var(--ink-3); }
.plan.p1 .pn { background: var(--green); }
.plan.p2 .pn { background: var(--red); }
.plan.p3 .pn { background: var(--blue); }
.plan.p4 .pn { background: #8a7a5c; }
.plan span { font-size: 12.5px; color: var(--ink-2); line-height: 1.75; }

/* 日志 */
.log-item { display: flex; gap: 8px; font-size: 12.5px; padding: 7px 0; border-top: 1px dashed var(--line-2); }
.log-item:first-child { border-top: none; }
.log-item i { font-style: normal; flex: 0 0 auto; font-size: 10px; color: var(--ink-3); padding-top: 2px; }
.log-item b { font-weight: 600; }

/* 操作条 */
.actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin: 4px 0 14px; }
.act-btn {
  border: 1px solid var(--line); background: var(--card); border-radius: 12px;
  padding: 12px 8px; font-size: 13px; font-weight: 700; color: var(--ink);
}
.act-btn.red { border-color: rgba(155, 44, 44, .35); color: var(--red); }
.act-btn.wide { grid-column: 1 / -1; background: var(--ink); color: #fdfbf6; border-color: var(--ink); }

/* ================= 我的 ================= */
.profile {
  display: flex; align-items: center; gap: 12px; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--r); padding: 14px;
}
.pav {
  width: 50px; height: 50px; border-radius: 10px; background: var(--red); color: #fff5f2;
  font-family: var(--serif); font-size: 24px; display: flex; align-items: center; justify-content: center; flex: 0 0 auto;
}
.pinfo b { display: block; font-size: 15.5px; }
.pinfo span { font-size: 12px; color: var(--ink-3); }
.row-btn {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  width: 100%; border: 1px solid var(--line); background: #fff; border-radius: 11px;
  padding: 12px 12px; font-size: 13.5px; margin-bottom: 8px; text-align: left;
}
.row-btn:last-child { margin-bottom: 0; }
.rv { font-size: 11.5px; color: var(--ink-3); }

/* ================= 底部导航 ================= */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  height: var(--bottom); padding-bottom: env(safe-area-inset-bottom);
  display: flex; background: rgba(246, 244, 239, .96); backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}
.tab {
  flex: 1; border: none; background: none; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 2px;
  font-size: 11px; color: var(--ink-3);
}
.tab span { font-size: 16px; line-height: 1; }
.tab.on { color: var(--red); font-weight: 700; }

/* ================= 生成中 ================= */
.veil {
  position: fixed; inset: 0; z-index: 100; background: rgba(24, 28, 36, .55);
  display: flex; align-items: center; justify-content: center; padding: 24px;
  backdrop-filter: blur(3px);
}
.gen-card {
  width: 100%; max-width: 340px; background: var(--card); border-radius: 16px;
  padding: 22px 20px 18px; text-align: center; border: 1px solid var(--line);
}
.gen-seal {
  width: 46px; height: 46px; margin: 0 auto 12px; border-radius: 10px;
  background: var(--red); color: #fff5f2; font-family: var(--serif); font-size: 24px;
  display: flex; align-items: center; justify-content: center;
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .78; transform: scale(.97); } }
.gen-title { font-family: var(--serif); font-size: 16px; margin-bottom: 10px; }
.gen-steps { font-size: 12px; color: var(--ink-3); line-height: 1.9; min-height: 44px; }
.gen-bar { height: 3px; background: var(--line-2); border-radius: 999px; overflow: hidden; margin: 10px 0 12px; }
.gen-bar i { display: block; height: 100%; width: 8%; background: var(--red); border-radius: 999px; transition: width .5s ease; }
.gen-note { font-size: 11px; color: #a29a8b; line-height: 1.8; margin: 0; }

/* ================= 面板 ================= */
.sheet-wrap {
  position: fixed; inset: 0; z-index: 95; background: rgba(24, 28, 36, .5);
  display: flex; align-items: flex-end; justify-content: center; backdrop-filter: blur(2px);
}
.sheet {
  width: 100%; max-width: 560px; max-height: 92dvh; overflow-y: auto;
  background: var(--card); border-radius: 18px 18px 0 0;
  padding-bottom: calc(16px + env(safe-area-inset-bottom));
  animation: rise .22s ease-out;
}
@keyframes rise { from { transform: translateY(26px); opacity: .6; } to { transform: none; opacity: 1; } }
.sheet-head {
  position: sticky; top: 0; z-index: 2; background: var(--card);
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px 10px; border-bottom: 1px solid var(--line-2);
  font-family: var(--serif); font-size: 16px;
}
.sheet-head .link { width: 52px; text-align: left; }
.w44 { width: 52px; }
.pad { padding: 14px 16px 4px; }

/* 表单 */
.field { margin-bottom: 16px; }
.field label { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 700; margin-bottom: 7px; }
.field input, .field select {
  width: 100%; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 12px; font-size: 14px; outline: none; background: #fff; margin-bottom: 8px;
}
.field input:focus, .field select:focus { border-color: var(--red); }
.btn-row { display: flex; gap: 8px; }
.ghost {
  flex: 1; border: 1px solid var(--line); background: #fff; border-radius: 10px;
  padding: 10px 0; font-size: 13px; color: var(--ink-2);
}
.ghost.danger { color: var(--red); border-color: rgba(155, 44, 44, .3); }
.msg { font-size: 11.5px; color: var(--ink-3); line-height: 1.7; margin: 8px 0 0; word-break: break-all; }
.msg.ok { color: var(--green); }
.msg.err { color: var(--red); }
.msg.hint { color: var(--ink-4, #9a958c); margin: 6px 0 8px; }

/* 分段选择 */
.seg { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.seg button {
  border: 1px solid var(--line); background: #fff; border-radius: 999px;
  padding: 7px 12px; font-size: 12px; color: var(--ink-3);
}
.seg button.on { background: var(--ink); color: #fdfbf6; border-color: var(--ink); }

textarea#logText, textarea#revText, .pad textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 12px; outline: none;
  padding: 12px; font-size: 14px; line-height: 1.65; resize: none; background: #fff;
  margin-bottom: 10px;
}
textarea:focus { border-color: var(--red); }
.primary {
  width: 100%; border: none; border-radius: 11px; padding: 12px 0;
  background: var(--ink); color: #fdfbf6; font-size: 14px; font-weight: 700;
  font-family: var(--serif); letter-spacing: .5px;
}
.primary:disabled { opacity: .6; }

/* 说明 */
.help p { margin: 0 0 14px; font-size: 13px; line-height: 1.8; }
.help b { display: block; font-family: var(--serif); margin-bottom: 2px; }
.help span { color: var(--ink-3); font-size: 12.5px; }

/* B 站嵌入 */
.embed-box {
  width: 100%; height: 62dvh; border: 1px solid var(--line); border-radius: 12px;
  overflow: hidden; background: #fff; margin-bottom: 10px;
}
.embed-box iframe { width: 100%; height: 100%; border: 0; display: block; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--bottom) + 16px); transform: translateX(-50%);
  background: rgba(28, 36, 48, .94); color: #fdfbf6; font-size: 12.5px; line-height: 1.6;
  border-radius: 10px; padding: 10px 15px; max-width: 86vw; z-index: 130; text-align: center;
}
.toast.err { background: rgba(155, 44, 44, .95); }

/* 辅助材料：内联视频窗口 */
.vidcard { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-top: 12px; background: #f5f2ec; }
.vid-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 11px; }
.vid-head b { font-size: 12.5px; color: var(--red); font-weight: 600; }
.vid-head span { font-size: 10.5px; color: var(--ink-3); text-align: right; line-height: 1.4; }
.vid-box { position: relative; height: 430px; background: #0d0f14; }
.vid-box iframe { width: 100%; height: 100%; border: 0; display: block; }
.vid-poster { position: absolute; inset: 0; z-index: 2; display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: #d9d2c4; text-align: center; font-size: 12px; line-height: 1.9; cursor: pointer;
  background: radial-gradient(circle at 50% 28%, #262a33, #0d0f14 75%); }
.vid-poster .play { width: 58px; height: 58px; border-radius: 50%; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22);
  display: flex; align-items: center; justify-content: center; font-size: 20px; color: #fff; margin-bottom: 12px; padding-left: 4px; }
.vid-poster small { color: #8b8577; font-size: 10.5px; }
.vid-poster.fade { opacity: 0; pointer-events: none; transition: opacity .5s .6s; }