:root {
  --bg: #f4f2ec;        /* 暖白底 */
  --surface: #fbfaf7;   /* 卡片 */
  --ink: #1c1a16;       /* 主文字 */
  --ink-2: #6b675e;     /* 次级 */
  --ink-3: #9b968b;     /* 弱化/元信息 */
  --line: #e6e3da;      /* 发丝线 */
  --accent: #b5503a;    /* 余烬橙——只用于「将熄」的时间 */

  --serif: "Songti SC", "Song", "STSong", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --r-card: 16px;
  --r-btn: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: #e9e8e3;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* 柔光墙：暖白渐变 + 玫瑰/藕荷两团淡色雾（固定，供半透明卡片透出） */
body::before {
  content: ''; position: fixed; top: 0; bottom: 0;
  left: 50%; transform: translateX(-50%);
  width: 100%; max-width: 540px; z-index: -1;
  background:
    repeating-linear-gradient(0deg, transparent 0, transparent 31px, rgba(60, 48, 34, .05) 31px, rgba(60, 48, 34, .05) 32px),
    repeating-linear-gradient(90deg, transparent 0, transparent 31px, rgba(60, 48, 34, .05) 31px, rgba(60, 48, 34, .05) 32px),
    radial-gradient(78% 50% at 12% 4%, rgba(202, 130, 128, .26), transparent 62%),
    radial-gradient(74% 50% at 90% 98%, rgba(112, 104, 166, .26), transparent 64%),
    linear-gradient(180deg, #f7f5f0 0%, #ece6dc 100%);
  box-shadow: 0 0 70px rgba(28, 22, 16, .07);
}
a { color: inherit; text-decoration: none; }

/* —— 按钮：胶囊 + 发丝描边 + 宽字距，克制 —— */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid transparent; border-radius: 999px;
  font-family: inherit; font-size: 15px; font-weight: 400;
  letter-spacing: 3px;
  padding: 14px 26px 14px 29px; /* 左多 3px，抵消末尾字距，视觉居中 */
  cursor: pointer;
  transition: opacity .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.btn:active { opacity: .65; }
.btn:disabled { opacity: .4; cursor: not-allowed; }

.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { background: #000; }

.btn-ghost { background: transparent; color: var(--ink); border-color: rgba(28, 26, 22, .22); }
.btn-ghost:hover { border-color: var(--ink); }

.btn-burn {
  background: transparent; color: var(--ink-2); border-color: var(--line);
  border-radius: 7px;
  padding: 8px 16px; font-size: 13px; letter-spacing: 1.5px;
}
.btn-burn:hover { border-color: var(--ink-3); color: var(--ink); }
.btn-burn:disabled { color: var(--ink-3); opacity: 1; border-color: var(--line); }

.btn-edit {
  background: transparent; color: var(--ink-3); border: none;
  padding: 8px 7px; font-size: 13px; letter-spacing: 1px;
}
.btn-edit:hover { color: var(--ink); }

/* —— 顶栏 —— */
.topbar {
  display: grid; grid-template-columns: 44px 1fr 44px; align-items: center;
  padding: calc(14px + env(safe-area-inset-top)) 0 14px;
}
.topbar h2 { font-size: 16px; font-weight: 600; text-align: center; margin: 0; letter-spacing: .5px; }
.topbar .back { font-size: 22px; line-height: 1; color: var(--ink-2); }
.topbar .link { color: var(--ink); font-size: 15px; font-weight: 600; text-align: right; }
.topbar--wall { grid-template-columns: auto 1fr auto; }
.brand-mini {
  justify-self: start;
  background: none; border: none; cursor: pointer;
  font-family: var(--serif); font-weight: 600; font-size: 17px; letter-spacing: 1.5px;
  color: var(--ink); padding: 4px 0; white-space: nowrap;
}

/* —— 页面骨架 —— */
.page {
  max-width: 540px; margin: 0 auto;
  padding: 0 18px calc(48px + env(safe-area-inset-bottom));
  min-height: 100vh; min-height: 100dvh;
}

/* 常驻头部：与墙同色、吸顶，底部一道渐隐让卡片“溶进墙里” */
.feed-head {
  position: sticky; top: 0; z-index: 6;
  margin: 0 -18px; padding: 0 18px;
  background: rgba(247, 245, 240, .55);
  -webkit-backdrop-filter: blur(16px) saturate(1.05);
  backdrop-filter: blur(16px) saturate(1.05);
}
.feed-head::after {
  content: ''; position: absolute; left: 0; right: 0; top: 100%;
  height: 18px; pointer-events: none;
  background: linear-gradient(180deg, rgba(247, 245, 240, .55), rgba(247, 245, 240, 0));
}

/* —— 首页：半透明覆盖层，透出背后的墙 —— */
body.home-open { overflow: hidden; }
.home-overlay {
  position: fixed; inset: 0; z-index: 30;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background: linear-gradient(180deg, rgba(244, 242, 236, .4), rgba(244, 242, 236, .66));
  -webkit-backdrop-filter: blur(16px) saturate(1.02);
  backdrop-filter: blur(16px) saturate(1.02);
  transition: opacity .45s ease, transform .55s cubic-bezier(.2, .7, .2, 1);
}
.home-overlay.dismissed {
  opacity: 0; transform: translateY(-8px) scale(1.012);
  pointer-events: none;
}
.home-card {
  width: 100%; max-width: 380px; text-align: center;
  padding: 48px 30px 28px;
  background: rgba(251, 250, 247, .55);
  border: 1px solid rgba(255, 255, 255, .6);
  border-radius: 22px;
  box-shadow: 0 20px 50px rgba(28, 26, 22, .12);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  display: flex; flex-direction: column; gap: 20px;
}
.brand-title {
  font-family: var(--serif); font-weight: 600;
  font-size: 36px; letter-spacing: 5px; margin: 0; color: var(--ink);
}
/* 「墙」字：左偏旁(土)=蓝色主题色，右边(啬)=红色主题色，硬分界 */
.wall-char {
  background: linear-gradient(90deg, var(--wall-blue) 0%, var(--wall-blue) 40%, var(--red-accent) 40%, var(--red-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.tagline { font-family: var(--serif); color: var(--ink-2); font-size: 15px; margin: 0; letter-spacing: 1.5px; }
.wall-status { margin-left: 8px; font-size: 12px; letter-spacing: .5px; color: var(--ink-2); }
.wall-status[hidden] { display: none; }
.wall-status::before {
  content: ''; display: inline-block; width: 5px; height: 5px; border-radius: 999px;
  background: rgba(181, 80, 58, .55); margin-right: 4px; vertical-align: middle; position: relative; top: -1px;
}
.wall-status.high::before { background: var(--accent); }
.wall-status.high { color: var(--accent); }
.home-actions { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.home-actions .btn { padding-top: 16px; padding-bottom: 16px; font-size: 16px; font-family: var(--serif); letter-spacing: 1.5px; }
.home-note { color: var(--ink-3); font-size: 12px; margin: 4px 0 0; letter-spacing: .5px; }
.sig { font-size: 10px; }
.sig-name { font-family: var(--serif); color: var(--ink-2); } /* 「曾晓鹏」签名，未来超链接占位 */

/* —— 看帖：排序标签（细下划线） —— */
.tabs {
  display: flex; align-items: center; gap: 22px; padding: 2px 2px 18px;
}
.view-count {
  margin-left: auto; font-size: 12px; color: var(--ink-3); letter-spacing: .3px;
  white-space: nowrap;
}
.view-count[hidden] { display: none; }
.view-count .view-num {
  font-family: var(--serif); font-weight: 600; color: var(--ink-2);
  font-variant-numeric: tabular-nums; margin: 0 1px;
}
.tab {
  background: none; border: none; padding: 6px 0; cursor: pointer;
  font: inherit; font-size: 15px; color: var(--ink-3); position: relative;
  transition: color .2s ease;
}
.tab.active { color: var(--ink); font-weight: 600; }
.tab::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; background: var(--ink); border-radius: 2px;
  transform: scaleX(0); transition: transform .2s ease;
}
.tab.active::after { transform: scaleX(1); }

/* —— 帖子卡片：便签感，发丝线，无重影 —— */
.feed { display: flex; flex-direction: column; gap: 16px; transition: opacity .18s ease, transform .18s ease; }
.feed.switching { opacity: 0; transform: translateY(6px); }
.card {
  background: var(--surface);
  border-radius: 6px; padding: 22px;
  box-shadow:
    0 1px 1px rgba(28, 22, 16, .035),
    0 10px 22px -14px rgba(28, 22, 16, .16),
    inset 0 1px 0 rgba(255, 255, 255, .45);
  display: flex; flex-direction: column; gap: 16px;
}
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.region { font-size: 13px; font-weight: 600; letter-spacing: 2px; color: var(--ink-2); }
.remain {
  font-size: 13px; color: var(--ink-3);
  font-variant-numeric: tabular-nums; letter-spacing: .3px; white-space: nowrap;
}
.remain.dying { color: var(--accent); font-weight: 600; }
.remain.dead { opacity: .55; }
.content {
  font-family: var(--serif); font-size: 17.5px; line-height: 1.75; color: var(--ink);
  white-space: pre-wrap; word-break: break-word; margin: 0;
}
.photo {
  width: 100%; border-radius: 4px; display: block;
  border: 1px solid var(--line); background: #f0eee8;
}
.card-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-top: 14px; border-top: 1px solid var(--line);
}
.contact { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.ctype { font-size: 12px; color: var(--ink-3); letter-spacing: .5px; }
.cval { font-size: 16px; font-weight: 600; color: var(--ink); word-break: break-all; }
.cval-reveal {
  align-self: flex-start;
  background: none; border: none; cursor: pointer;
  font: inherit; font-size: 14px; color: var(--ink-3); letter-spacing: .5px;
  padding: 2px 0;
  text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line);
  transition: color .18s ease;
}
.cval-reveal:hover { color: var(--ink); text-decoration-color: var(--ink-3); }
.cval-reveal:disabled { color: var(--ink-3); cursor: default; text-decoration: none; }
.card-actions { display: flex; align-items: center; gap: 6px; flex: none; }
.card-meta { font-size: 12px; color: var(--ink-3); letter-spacing: .3px; }
.card-meta:empty { display: none; }

/* —— 发帖表单 —— */
.capacity {
  color: var(--ink-3); font-size: 13px; letter-spacing: .3px;
  padding: 0 2px 16px; margin: 2px 0 6px; border-bottom: 1px solid var(--line);
}
.form { display: flex; flex-direction: column; gap: 18px; }
.form label { display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: var(--ink-2); letter-spacing: .3px; }
.form .req { color: var(--accent); }
.form input, .form select, .form textarea {
  font: inherit; font-size: 16px; color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--r-btn); padding: 13px 14px; width: 100%;
}
.form textarea { resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--ink); }
.form .btn-primary { width: 100%; }
.photo-label.disabled { opacity: .55; }
.notice {
  font-size: 13px; color: var(--ink-2); line-height: 1.65;
  padding: 2px 2px; background: transparent;
}
.notice strong { color: var(--ink); font-weight: 600; }

/* —— 弹窗 —— */
.modal-back {
  position: fixed; inset: 0; z-index: 40;
  background: rgba(28, 22, 16, .35);
  -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px);
  display: flex; align-items: flex-end; justify-content: center;
}
.modal {
  background: var(--bg); width: 100%; max-width: 540px;
  border-radius: 22px 22px 0 0;
  padding: 22px 18px calc(22px + env(safe-area-inset-bottom));
  max-height: 92vh; overflow: auto;
}
.modal h3 { font-family: var(--serif); font-weight: 600; font-size: 20px; margin: 4px 0 18px; letter-spacing: 1px; }
.modal form { display: flex; flex-direction: column; gap: 14px; }
.modal label { display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: var(--ink-2); }
.modal input, .modal select, .modal textarea {
  font: inherit; font-size: 16px; color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--r-btn); padding: 13px 14px; width: 100%;
}
.modal-actions { display: flex; gap: 10px; margin-top: 6px; }
.modal-actions .btn { flex: 1; }

/* —— 杂项 —— */
.err { color: var(--accent); font-size: 14px; min-height: 1em; margin: 4px 0 0; font-weight: 600; }
.err:not(:empty)::before { content: "⚠ "; }

/* —— 缺填高亮：红圈 + 行内红字 + 轻微抖动，指到没填的那一项 —— */
.papers.invalid, .chips.invalid {
  outline: 2px solid var(--accent); outline-offset: 8px; border-radius: 14px;
}
.contact-input.invalid { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(181, 80, 58, .15); }
.inline-err { color: var(--accent); font-size: 13.5px; font-weight: 600; letter-spacing: .3px; margin: 8px 0 0; }
.inline-err::before { content: "⚠ "; }
@keyframes wall-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}
.shake { animation: wall-shake .32s ease; }
.muted { color: var(--ink-3); text-align: center; padding: 36px 0; font-size: 14px; }
.empty { color: var(--ink-3); text-align: center; padding: 72px 16px; font-size: 15px; letter-spacing: .5px; }

.site-foot {
  margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--line);
  color: var(--ink-3); font-size: 12px; text-align: center; letter-spacing: .3px;
}
.site-foot p { margin: 4px 0; }
.site-foot .legal { font-size: 11px; opacity: .85; }
.site-foot .owner { font-size: 12px; }
.owner-link { font-family: var(--serif); font-size: inherit; color: inherit; text-decoration: none; letter-spacing: .5px; }
.home-card .site-foot { margin-top: 16px; border-top: none; padding-top: 0; }

/* —— 发帖：点击选取的 chips（替代下拉框） —— */
.field { display: flex; flex-direction: column; gap: 10px; }
.field-label { font-size: 13px; color: var(--ink-2); letter-spacing: .3px; }
.char-count { align-self: flex-end; font-size: 12px; color: var(--ink-3); letter-spacing: .3px; font-variant-numeric: tabular-nums; }
.char-count.full { color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 9px 16px; font: inherit; font-size: 14px; letter-spacing: 1px;
  cursor: pointer; transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.chip:hover { border-color: var(--ink-3); }
.chip.selected { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* —— 发帖：从底部滑上来的面板 —— */
.topbar button.link { background: none; border: none; cursor: pointer; font-family: inherit; }
.topbar .link:disabled { color: var(--ink-3); opacity: .5; cursor: default; }
body.sheet-open { overflow: hidden; }
.sheet-back {
  position: fixed; inset: 0; z-index: 35;
  display: flex; align-items: flex-end; justify-content: center;
  background: rgba(28, 22, 16, 0);
  -webkit-backdrop-filter: blur(0); backdrop-filter: blur(0);
  pointer-events: none;
  transition: background .35s ease, -webkit-backdrop-filter .35s ease, backdrop-filter .35s ease;
}
.sheet-back.open {
  background: rgba(28, 22, 16, .32);
  -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px);
  pointer-events: auto;
}
.sheet {
  width: 100%; max-width: 540px; background: var(--bg);
  border-radius: 24px 24px 0 0;
  padding: 4px 18px calc(24px + env(safe-area-inset-bottom));
  max-height: 92vh; overflow: auto;
  transform: translateY(100%);
  transition: transform .42s cubic-bezier(.2, .8, .2, 1), background .3s ease;
}
.sheet-back.open .sheet { transform: translateY(0); }
.sheet::before {
  content: ''; display: block; width: 38px; height: 4px;
  background: var(--line); border-radius: 2px; margin: 8px auto 0;
}
.sheet-head {
  position: sticky; top: 0; z-index: 1; background: var(--bg);
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0 8px;
  transition: background .3s ease;
}
.sheet-head h2 { font-family: var(--serif); font-weight: 600; font-size: 20px; letter-spacing: 1px; margin: 0; }
.sheet-close {
  background: none; border: none; color: var(--ink-3); cursor: pointer;
  font: inherit; font-size: 15px; letter-spacing: 1px; padding: 6px 4px;
}
.sheet-close:hover { color: var(--ink); }

/* —— 发帖：选图 + 缩略图预览 —— */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0;
}
.photo-row { display: flex; align-items: flex-start; gap: 12px; }
.photo-pick {
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 10px 18px; font-size: 14px; color: var(--ink-2); letter-spacing: 1px;
  cursor: pointer; transition: border-color .18s ease, color .18s ease;
}
.photo-pick:hover { border-color: var(--ink-3); color: var(--ink); }
.photo-pick.disabled { opacity: .5; cursor: not-allowed; }
.photo-pick[hidden] { display: none; }
.photo-preview { position: relative; width: 96px; height: 96px; }
.photo-preview[hidden] { display: none; }
.photo-preview img {
  width: 100%; height: 100%; object-fit: cover;
  border-radius: 12px; border: 1px solid var(--line); display: block;
}
.photo-remove {
  position: absolute; top: 5px; right: 5px;
  width: 24px; height: 24px; border: none; border-radius: 999px;
  background: rgba(28, 22, 16, .6); color: #fff;
  font-size: 15px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px);
}
.photo-remove:hover { background: rgba(28, 22, 16, .85); }

/* —— 主题纸色：红纸 / 蓝纸（低饱和信笺纸，克制） —— */
:root {
  --red-paper: #f6e2e1;  --red-paper-rgb: 246, 226, 225;  --red-line: #eccfcb;  --red-accent: #b0463a;
  --blue-paper: #e9e7f2; --blue-paper-rgb: 233, 231, 242; --blue-line: #d2cce0; --blue-accent: #5b4f86;
  --wall-blue: #3b4fc4; /* 「墙」左偏旁专用：更鲜艳的靛蓝，仍与紫纸同调，不脱离主题 */
}
[data-color="red"]  { --paper: var(--red-paper);  --paper-rgb: var(--red-paper-rgb);  --paper-line: var(--red-line);  --paper-accent: var(--red-accent); }
[data-color="blue"] { --paper: var(--blue-paper); --paper-rgb: var(--blue-paper-rgb); --paper-line: var(--blue-line); --paper-accent: var(--blue-accent); }

/* 选张纸 */
.papers { display: flex; gap: 10px; }
.paper-opt {
  flex: 1; display: flex; align-items: center; gap: 10px;
  background: transparent; border: 1px solid var(--line); border-radius: 14px;
  padding: 12px 14px; cursor: pointer; font: inherit; font-size: 15px; color: var(--ink-2);
  transition: border-color .18s ease, color .18s ease, box-shadow .18s ease;
}
.paper-opt:hover { border-color: var(--ink-3); }
.paper-swatch {
  width: 26px; height: 32px; border-radius: 4px; flex: none;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .06);
}
.paper-opt[data-color="red"]  .paper-swatch { background: var(--red-paper);  border: 1px solid var(--red-line); }
.paper-opt[data-color="blue"] .paper-swatch { background: var(--blue-paper); border: 1px solid var(--blue-line); }
.paper-opt.selected { color: var(--ink); }
.paper-opt[data-color="red"].selected  { border-color: var(--red-accent);  box-shadow: 0 0 0 1px var(--red-accent); }
.paper-opt[data-color="blue"].selected { border-color: var(--blue-accent); box-shadow: 0 0 0 1px var(--blue-accent); }

/* 帖子卡片用所选纸色 */
.card[data-color] {
  background: rgba(var(--paper-rgb), .55);
}
.card[data-color] .card-foot { border-top-color: var(--paper-line); }
.card[data-color] .region { color: var(--paper-accent); }
.card[data-color] .photo { border-color: var(--paper-line); }
.card[data-color] .btn-burn { border-color: var(--paper-line); }
.card[data-color] .cval-reveal { text-decoration-color: var(--paper-line); }

/* 发帖面板：选纸后整屏预览该纸色 */
.sheet[data-color] { background: var(--paper); }
.sheet[data-color] .sheet-head { background: var(--paper); }
.sheet[data-color]::before { background: var(--paper-line); }
.sheet[data-color] .capacity { border-bottom-color: var(--paper-line); }
.sheet[data-color] .btn-primary { background: var(--paper-accent); }

@media (min-width: 600px) {
  .modal-back { align-items: center; }
  .modal { border-radius: 22px; }
}