/* =====================================================
   一眼千年 · 手机版样式
   手机优先；桌面打开时居中显示 480px「手机框」
   ===================================================== */

:root{
  --paper:#faf6ee;
  --paper-2:#f3ecdd;
  --ink:#2b2620;
  --ink-soft:#6b6156;
  --red:#b93a32;
  --red-deep:#8e2a24;
  --gold:#c9a227;
  --gold-soft:#e8d9a8;
  --teal:#2c5f6e;
  --card:#fffdf7;
  --line:#e5dcc8;
  --serif:"Noto Serif SC","Source Han Serif SC","STSong","SimSun",serif;
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --tabbar-h:62px;
}

*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:#41352a;
  color:var(--ink);
  line-height:1.7;
}
body{background-image:radial-gradient(rgba(232,217,168,.07) 1px, transparent 1px);background-size:26px 26px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

/* 桌面打开：手机框居中；真手机：全屏 */
.phone{
  position:relative;
  max-width:480px;
  margin:0 auto;
  min-height:100vh;
  background:var(--paper);
  box-shadow:0 0 60px rgba(0,0,0,.45);
  display:flex;
  flex-direction:column;
}
@media (min-width:560px){
  body{padding:26px 0}
  .phone{border-radius:34px;overflow:hidden;min-height:calc(100vh - 52px)}
}

/* ---------- 顶栏 ---------- */
.m-topbar{
  position:sticky;top:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 14px;
  background:rgba(250,246,238,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.m-brand{display:flex;align-items:center;gap:9px;font-family:var(--serif);font-weight:700;font-size:18px}
.m-brand i{font-style:normal;font-size:10px;color:#fff;background:var(--gold);border-radius:999px;padding:1px 7px;vertical-align:3px;margin-left:6px;letter-spacing:1px}
.m-brand-seal{
  width:34px;height:34px;display:grid;place-items:center;
  background:var(--red);color:#fff;font-size:18px;border-radius:9px;
  box-shadow:0 3px 8px rgba(185,58,50,.35);
}
.m-mode-btn{
  font-size:14px;font-weight:600;color:var(--red-deep);
  background:var(--paper-2);border:1px solid var(--gold-soft);
  border-radius:999px;padding:8px 14px;
}

/* ---------- Tab 页面 ---------- */
.m-main{flex:1;padding-bottom:calc(var(--tabbar-h) + 14px)}
.m-page{display:none;animation:mFade .35s ease}
.m-page.active{display:block}
@keyframes mFade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* ---------- 首页 ---------- */
.m-hero{position:relative;height:200px;overflow:hidden}
.m-hero img{width:100%;height:100%;object-fit:cover}
.m-hero-text{
  position:absolute;inset:0;display:flex;flex-direction:column;
  justify-content:center;align-items:center;gap:2px;
  background:linear-gradient(180deg,rgba(43,38,32,.5),rgba(43,38,32,.15));
}
.m-hero-text h1{
  font-family:var(--serif);font-size:44px;color:#fff;letter-spacing:8px;
  text-shadow:0 4px 18px rgba(0,0,0,.4);
}
.m-hero-text h1 span{color:#f5d67b}
.m-hero-text p{color:rgba(255,255,255,.95);font-size:14px;letter-spacing:2px;text-shadow:0 1px 6px rgba(0,0,0,.5)}

.m-continue{
  margin:14px 14px 0;display:flex;align-items:center;gap:12px;
  background:linear-gradient(120deg,#fff7e0,#fdeecb);
  border:1px solid var(--gold-soft);border-radius:16px;padding:12px 16px;
  box-shadow:0 6px 16px rgba(160,122,24,.14);
}
.m-continue-icon{font-size:24px}
.m-continue-body{flex:1;line-height:1.4}
.m-continue-body em{font-style:normal;font-size:12px;color:var(--ink-soft);display:block}
.m-continue-body strong{font-size:16px;color:var(--red-deep)}
.m-continue-arrow{font-size:22px;color:var(--gold)}

.m-section{margin-top:22px;padding:0 14px}
.m-sec-title{
  font-family:var(--serif);font-size:20px;letter-spacing:2px;margin-bottom:12px;
  display:flex;align-items:center;gap:8px;
}
.m-sec-title::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}

.m-mode-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.m-mode-card{
  background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:14px 6px;text-align:center;display:flex;flex-direction:column;gap:4px;
  transition:transform .2s,border-color .2s;
}
.m-mode-card:active{transform:scale(.96)}
.m-mode-card b{font-size:15px;color:var(--red-deep)}
.m-mode-card span{font-size:11.5px;color:var(--ink-soft)}

.m-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.m-grid-item{
  position:relative;background:var(--card);border:1px solid var(--line);
  border-radius:16px;padding:13px 4px 11px;text-align:center;
  display:flex;flex-direction:column;align-items:center;gap:3px;
  transition:transform .2s;
}
.m-grid-item:active{transform:scale(.95)}
.m-grid-item .g-emoji{font-size:26px}
.m-grid-item .g-name{font-family:var(--serif);font-weight:700;font-size:15px;color:var(--ink)}
.m-grid-item .g-era{font-size:10px;color:var(--ink-soft)}
.m-grid-item::before{
  content:"";position:absolute;top:0;left:14px;right:14px;height:4px;
  border-radius:0 0 6px 6px;background:var(--g-color,var(--red));
}
.m-grid-item.spot::after{
  content:"番外";position:absolute;top:-6px;right:-4px;font-size:9px;
  background:var(--gold);color:#fff;border-radius:999px;padding:1px 7px;
  box-shadow:0 2px 6px rgba(0,0,0,.2);
}

.m-more-links{display:flex;flex-direction:column;gap:10px}
.m-more-link{
  display:flex;align-items:center;gap:12px;
  background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:13px 16px;font-size:15px;font-weight:600;
}
.m-more-link span{font-size:20px}
.m-more-link:active{background:var(--paper-2)}

.m-footnote{
  margin:22px 14px 8px;text-align:center;font-size:11.5px;color:var(--ink-soft);opacity:.85;
}
.m-footnote a{color:var(--red);font-weight:600}

/* ---------- 时间轴 ---------- */
.m-era-toolbar{
  position:sticky;top:54px;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:10px 14px;background:rgba(250,246,238,.94);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.m-expand-btn{
  font-size:13.5px;font-weight:700;color:#fff;background:var(--red);
  border-radius:999px;padding:8px 16px;box-shadow:0 4px 10px rgba(185,58,50,.3);
}
.m-era-tip{font-size:11px;color:var(--ink-soft)}

#mErasList{position:relative;padding:16px 14px 4px}
#mErasList::before{
  content:"";position:absolute;left:34px;top:0;bottom:0;width:4px;border-radius:4px;
  background:linear-gradient(180deg,var(--red),var(--gold),var(--teal),var(--red));opacity:.3;
}

.m-era{position:relative;margin-bottom:26px}
.m-era-dot{
  position:absolute;left:12px;top:16px;width:26px;height:26px;border-radius:50%;
  background:var(--era-color,var(--red));z-index:2;
  border:4px solid var(--paper);box-shadow:0 0 0 3px var(--era-color,var(--red));
}
.m-era-card{
  margin-left:44px;background:var(--card);
  border:1px solid var(--line);border-top:5px solid var(--era-color,var(--red));
  border-radius:18px;overflow:hidden;box-shadow:0 8px 24px rgba(60,45,20,.09);
}
.m-era-card .m-era-img{position:relative}
.m-era-card .m-era-img img{width:100%;height:172px;object-fit:cover}
.m-era-card .m-era-img figcaption{
  position:absolute;left:10px;bottom:8px;font-size:11px;color:#fff;
  background:rgba(0,0,0,.45);padding:2px 10px;border-radius:999px;
}
.m-era-head{padding:14px 16px 10px;border-bottom:1px dashed var(--line)}
.m-era-order{
  display:inline-block;font-size:11px;letter-spacing:1px;color:#fff;
  background:var(--era-color,var(--red));border-radius:999px;padding:2px 11px;margin-bottom:6px;
}
.m-era-head h2{
  font-family:var(--serif);font-size:30px;letter-spacing:5px;
  color:var(--era-color,var(--red));display:inline-block;margin-right:8px;
}
.m-era-head .m-era-full{display:inline;font-size:13px;color:var(--ink-soft)}
.m-era-period{font-size:12.5px;color:var(--ink-soft);margin-top:4px;line-height:1.6}

.m-era-body{padding:12px 14px 14px}

.m-kid{
  background:linear-gradient(120deg,#fff7e0,#fdf0d5);
  border:1px solid var(--gold-soft);border-radius:14px;
  padding:12px 14px;font-size:16px;line-height:1.85;margin-bottom:10px;
}
.m-kid b{display:block;font-size:13px;color:#a07a18;margin-bottom:4px}

/* 折叠面板 */
.m-sec{border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden;background:var(--paper)}
.m-sec summary{
  list-style:none;display:flex;align-items:center;gap:6px;
  padding:11px 14px;font-size:14.5px;font-weight:700;
  color:var(--era-color,var(--red));cursor:pointer;user-select:none;
  min-height:44px;
}
.m-sec summary::-webkit-details-marker{display:none}
.m-sec summary::after{
  content:"▾";margin-left:auto;transition:transform .25s;font-size:12px;opacity:.7;
}
.m-sec[open] summary::after{transform:rotate(180deg)}
.m-sec .m-sec-body{padding:2px 14px 13px;font-size:13.5px}

.capital-list{display:flex;flex-direction:column;gap:8px}
.capital-item{
  display:flex;flex-wrap:wrap;align-items:center;gap:7px;
  background:var(--card);border-radius:10px;padding:8px 12px;font-size:13.5px;
}
.capital-ancient{font-family:var(--serif);font-weight:700}
.capital-arrow{color:var(--era-color,var(--red));font-weight:700}
.capital-modern{color:var(--ink-soft)}
.capital-note{width:100%;font-size:11.5px;color:var(--ink-soft)}

.person-list,.event-list,.bld-list,.relic-list{display:flex;flex-direction:column;gap:9px}
.person,.event,.bld,.relic{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:9px 12px;font-size:13px;
}
.p-name{font-weight:700;font-family:var(--serif);font-size:14.5px}
.p-role{
  display:inline-block;font-size:10.5px;color:#fff;background:var(--era-color,var(--red));
  border-radius:999px;padding:1px 8px;margin-left:6px;vertical-align:2px;
}
.p-desc,.e-desc,.b-where,.r-where{display:block;color:var(--ink-soft);margin-top:2px;line-height:1.6}
.e-title{font-weight:700;font-size:13.5px}
.e-title::before{content:"⚔️ "}
.b-name,.r-name{font-weight:700;font-size:13.5px}
.b-name::before{content:"🏯 "}
.r-name::before{content:"🏺 "}
.b-where,.r-where{font-size:12px}
.b-where::before{content:"📍 "}
.badge-wh{
  display:inline-block;font-size:10px;color:#7a5a00;background:linear-gradient(120deg,#ffe9a8,#ffd76e);
  border-radius:999px;padding:1px 7px;margin-left:6px;font-weight:700;vertical-align:2px;
}

.change-steps{display:flex;flex-direction:column}
.step{display:flex;gap:12px;position:relative;padding-bottom:14px}
.step:last-child{padding-bottom:0}
.step-num{
  flex:0 0 26px;height:26px;border-radius:50%;
  background:var(--era-color,var(--red));color:#fff;font-weight:700;font-size:13px;
  display:grid;place-items:center;z-index:1;
}
.step::before{
  content:"";position:absolute;left:12.5px;top:26px;bottom:0;width:2px;
  background:var(--era-color,var(--red));opacity:.35;
}
.step:last-child::before{display:none}
.step-text{font-size:13px;padding-top:2px}

.culture-list{list-style:none;display:flex;flex-direction:column;gap:6px;font-size:13px}
.culture-list li::before{content:"💡 "}
.points-list{list-style:none;display:flex;flex-direction:column;gap:6px;font-size:13px;margin-top:10px}
.points-list li{
  background:rgba(44,95,110,.06);border-left:3px solid var(--teal);
  padding:6px 10px;border-radius:0 8px 8px 0;
}
.points-list li::before{content:"📝 "}
.m-sec-sub{font-size:13px;font-weight:700;color:var(--teal);margin-top:10px}

.m-fun{
  background:linear-gradient(120deg,#fdeeee,#fff6f0);
  border:1px solid #f2cfc7;border-radius:14px;
  padding:12px 14px;font-size:13.5px;line-height:1.8;
}
.m-fun b{display:block;font-size:13px;color:var(--red);margin-bottom:3px}

/* ---------- 朝代歌 ---------- */
.m-song-page{
  min-height:70vh;color:#f7f1e3;padding:30px 18px 20px;
  background:linear-gradient(135deg,#2b2620,#41352a 60%,#2b2620);
}
.m-song-title{font-family:var(--serif);font-size:30px;text-align:center;letter-spacing:5px}
.m-song-sub{text-align:center;font-size:13px;color:rgba(247,241,227,.7);margin:6px 0 20px}
.m-song-lines{display:flex;flex-direction:column;gap:12px;max-width:420px;margin:0 auto}
.m-song-line{
  background:rgba(255,255,255,.06);border:1px solid rgba(232,217,168,.35);
  border-radius:14px;padding:14px;text-align:center;
  font-family:var(--serif);font-size:19px;letter-spacing:3px;line-height:1.9;
}
.m-song-line em{font-style:normal;color:#f5d67b;font-weight:700;display:block}
.m-song-go{
  display:block;margin:22px auto 0;max-width:300px;text-align:center;
  background:var(--red);color:#fff;font-weight:600;font-size:14.5px;
  border-radius:999px;padding:12px;
  box-shadow:0 6px 16px rgba(185,58,50,.4);
}

/* ---------- 比例尺（条形图） ---------- */
#mScale{padding:26px 16px}
.m-scale-note{font-size:13px;color:var(--ink-soft);margin-bottom:14px}
.m-scale-row{
  display:flex;align-items:center;gap:10px;margin-bottom:9px;
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:9px 12px;
}
.m-scale-row:active{background:var(--paper-2)}
.m-scale-name{
  flex:0 0 58px;font-family:var(--serif);font-weight:700;font-size:14.5px;
  color:var(--row-color,var(--red));white-space:nowrap;
}
.m-scale-track{flex:1;height:14px;border-radius:8px;background:var(--paper-2);overflow:hidden}
.m-scale-fill{
  height:100%;border-radius:8px;min-width:6px;
  background:var(--row-color,var(--red));
  background:linear-gradient(90deg,var(--row-color,var(--red)),color-mix(in srgb,var(--row-color,var(--red)) 65%, #fff));
}
.m-scale-years{flex:0 0 64px;text-align:right;font-size:11.5px;color:var(--ink-soft);white-space:nowrap}

/* ---------- 底部 Tab 栏 ---------- */
.m-tabbar{
  position:sticky;bottom:0;z-index:60;
  display:flex;height:var(--tabbar-h);
  background:rgba(255,253,247,.96);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom);
}
.m-tab{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;font-size:11px;color:var(--ink-soft);
}
.m-tab span{font-size:20px;line-height:1}
.m-tab.active{color:var(--red);font-weight:700}

/* ---------- 学段弹层 ---------- */
.m-sheet-mask{
  position:fixed;inset:0;background:rgba(43,38,32,.5);z-index:80;
  opacity:0;transition:opacity .25s;
}
.m-sheet-mask.show{opacity:1}
.m-sheet{
  position:fixed;left:0;right:0;bottom:0;z-index:81;
  max-width:480px;margin:0 auto;
  background:var(--card);border-radius:22px 22px 0 0;
  padding:16px 16px calc(18px + env(safe-area-inset-bottom));
  transform:translateY(105%);transition:transform .3s ease;
  box-shadow:0 -10px 40px rgba(0,0,0,.25);
}
.m-sheet.show{transform:translateY(0)}
.m-sheet-head{
  display:flex;align-items:center;justify-content:space-between;
  font-family:var(--serif);font-size:18px;font-weight:700;margin-bottom:12px;
}
.m-sheet-head button{font-size:16px;color:var(--ink-soft);width:34px;height:34px;border-radius:50%;background:var(--paper-2)}
.m-sheet-item{
  display:flex;flex-direction:column;align-items:flex-start;gap:2px;
  width:100%;text-align:left;
  background:var(--paper);border:1px solid var(--line);border-radius:14px;
  padding:13px 15px;margin-bottom:10px;
}
.m-sheet-item:active{background:var(--paper-2)}
.m-sheet-item b{font-size:15.5px;color:var(--red-deep)}
.m-sheet-item span{font-size:12.5px;color:var(--ink-soft)}

/* ---------- 返回顶部 ---------- */
.m-backtop{
  position:fixed;right:calc(50% - 240px + 14px);bottom:calc(var(--tabbar-h) + 18px);
  width:44px;height:44px;border-radius:50%;z-index:70;
  background:var(--red);color:#fff;font-size:18px;
  box-shadow:0 8px 20px rgba(185,58,50,.45);
  opacity:0;pointer-events:none;transform:translateY(12px);transition:all .3s;
}
.m-backtop.show{opacity:1;pointer-events:auto;transform:none}
@media (max-width:520px){
  .m-backtop{right:14px}
}

/* ---------- 学段模式显隐（与桌面版一致） ---------- */
body.mode-senior .only-kid,body.mode-senior .only-primary{display:none!important}
body.mode-primary .only-kid,body.mode-primary .only-senior{display:none!important}
body.mode-kid .only-primary,body.mode-kid .only-senior{display:none!important}

/* 幼儿园模式：大字、展开关键块 */
body.mode-kid .m-era-card .m-era-img img{height:190px}
body.mode-kid .m-kid{font-size:18px}

/* 图片加载失败兜底 */
.m-era-img.error{background:linear-gradient(120deg,#e8dcc3,#d9c9a3);height:172px}