/* ======================================================================
   咖啡萃取比例计算器 · 独立设计（咖啡馆黑板菜单主题）
   浅色 = 燕麦奶白 + 深焙棕 + 铜色点缀；深色 = 夜场吧台
   ====================================================================== */
.cer{
  --ink:#2e2118; --sub:#8a7462; --faint:#b3a08e;
  --bg:#f6f1e7; --card:#fffdf8; --card2:#f0e7d8; --line:#e2d5c0; --line2:#ece2d1;
  --pri:#6f4e37; --pri-2:#9c6b4a; --pri-soft:#f0e2d4; --pri-ink:#4c3322;
  --copper:#c07a3e; --copper-soft:#f8ead8;
  --green:#4e7d5a; --green-soft:#e4efe6;
  --red:#a84332; --red-soft:#f8e4de;
  --r:16px;
  --shadow:0 1px 2px rgba(46,33,24,.05),0 14px 32px rgba(111,78,55,.10);
  color:var(--ink);
  font-family:"Avenir Next","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",-apple-system,sans-serif;
  font-size:15px; line-height:1.75;
  background:
    radial-gradient(760px 380px at 110% -100px, rgba(192,122,62,.12), transparent 60%),
    radial-gradient(600px 320px at -10% 120%, rgba(111,78,55,.08), transparent 60%),
    var(--bg);
  padding:0 16px 60px;
}
:root[data-theme="dark"] .cer{
  --ink:#efe3d3; --sub:#b09a84; --faint:#7c6a58;
  --bg:#191310; --card:#231a14; --card2:#2b2018; --line:#3d2e21; --line2:#33261c;
  --pri:#c89b74; --pri-2:#e0b58c; --pri-soft:rgba(200,155,116,.14); --pri-ink:#ecd0ae;
  --copper:#e0a26a; --copper-soft:rgba(224,162,106,.12);
  --green:#8fc29b; --green-soft:rgba(143,194,155,.12);
  --red:#e08a76; --red-soft:rgba(224,138,118,.12);
  --shadow:0 1px 2px rgba(0,0,0,.5),0 16px 36px rgba(0,0,0,.5);
}
.cer *{box-sizing:border-box;}
.cer b{font-weight:700;}
.cer-wrap{max-width:1060px;margin:0 auto;}
.cer-num{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;font-weight:700;}

/* ---------- Hero：咖啡杯剪影 ---------- */
.cer-hero{margin-top:22px;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow);
  background:linear-gradient(120deg,#3a281d 0%,#5d4030 55%,#7a5640 100%);position:relative;}
.cer-hero-in{padding:28px 30px;display:flex;gap:22px;align-items:center;flex-wrap:wrap;}
.cer-cup{width:110px;height:110px;flex:none;}
.cer-hero-txt{flex:1;min-width:260px;}
.cer-hero h1{margin:0 0 8px;font-size:clamp(23px,3.4vw,31px);font-weight:900;color:#f7ecdd;line-height:1.3;}
.cer-hero p{margin:0;color:#d8c3ab;font-size:14.5px;max-width:660px;}
.cer-hero p em{font-style:normal;color:#ffd9a8;font-weight:700;}

/* ---------- 模式切换 ---------- */
.cer-modes{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap;}
.cer-mode{flex:1;min-width:150px;border:1.5px solid var(--line);background:var(--card);border-radius:12px;padding:10px 14px;cursor:pointer;text-align:center;font-weight:800;color:var(--sub);font-size:14.5px;transition:all .15s;}
.cer-mode small{display:block;font-weight:500;font-size:11.5px;color:var(--faint);margin-top:2px;}
.cer-mode.on{border-color:var(--copper);background:var(--copper-soft);color:var(--pri-ink);box-shadow:0 0 0 3px rgba(192,122,62,.12);}

/* ---------- 工作台 ---------- */
.cer-desk{display:grid;grid-template-columns:380px 1fr;gap:18px;margin-top:16px;}
@media (max-width:900px){.cer-desk{grid-template-columns:1fr;}}
.cer-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:20px 22px;}
.cer-card h2{margin:0 0 12px;font-size:16px;font-weight:900;display:flex;align-items:center;gap:8px;}
.cer-card h2::before{content:'';width:8px;height:8px;border-radius:50%;background:var(--copper);}
.cer-field{margin-bottom:14px;}
.cer-field label{display:block;font-size:13px;font-weight:700;color:var(--sub);margin-bottom:5px;}
.cer-in{width:100%;border:1.5px solid var(--line);background:var(--card2);color:var(--ink);border-radius:10px;padding:10px 13px;font-size:15px;outline:none;transition:border-color .15s;}
.cer-in:focus{border-color:var(--copper);box-shadow:0 0 0 3px var(--copper-soft);}
.cer-slider{width:100%;accent-color:var(--copper);margin-top:8px;}
.cer-ratio-lab{font-size:13px;color:var(--pri-ink);font-weight:800;margin-top:4px;}
.cer-btn{border:none;border-radius:10px;padding:9px 18px;font-size:14px;font-weight:800;cursor:pointer;transition:all .15s;font-family:inherit;}
.cer-btn-go{background:var(--pri);color:#fff;}
:root[data-theme="dark"] .cer-btn-go{color:#241710;}
.cer-btn-go:hover{background:var(--pri-2);}
.cer-btn-ghost{background:var(--card2);color:var(--pri-ink);border:1.5px solid var(--line);}
.cer-btn-ghost:hover{border-color:var(--copper);}
.cer-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px;}
.cer-msg{margin-top:10px;font-size:13px;min-height:20px;font-weight:700;}
.cer-msg.err{color:var(--red);}
.cer-msg.ok{color:var(--green);}

/* ---------- 结果 ---------- */
.cer-big{display:flex;gap:14px;flex-wrap:wrap;}
.cer-stat{flex:1;min-width:130px;background:var(--card2);border:1px solid var(--line2);border-radius:12px;padding:12px 14px;text-align:center;}
.cer-stat i{display:block;font-style:normal;font-size:12px;color:var(--sub);margin-bottom:4px;font-weight:700;}
.cer-stat b{font-size:24px;color:var(--pri-ink);}
.cer-stat u{text-decoration:none;font-size:12px;color:var(--faint);font-weight:400;}
.cer-band{margin-top:16px;}
.cer-band-t{font-size:13px;font-weight:800;color:var(--sub);margin-bottom:6px;}
.cer-track{position:relative;height:26px;border-radius:99px;background:linear-gradient(90deg,#d9c8ae, #7fae87 30%, #4e7d5a 45%, #4e7d5a 62%, #a84332 92%);border:1px solid var(--line);overflow:hidden;}
:root[data-theme="dark"] .cer-track{filter:brightness(.8) saturate(.9);}
.cer-marker{position:absolute;top:-3px;width:4px;height:32px;background:var(--ink);border-radius:2px;transition:left .3s;}
.cer-scale{display:flex;justify-content:space-between;font-size:11px;color:var(--faint);margin-top:4px;}
.cer-advice{margin-top:14px;border-radius:12px;padding:12px 14px;font-size:14px;border:1px solid var(--line2);background:var(--green-soft);color:var(--ink);}
.cer-advice.warn{background:var(--copper-soft);}
.cer-advice.bad{background:var(--red-soft);}
.cer-advice b{color:var(--pri-ink);}
.cer-table{width:100%;border-collapse:collapse;font-size:13px;margin-top:14px;}
.cer-table th,.cer-table td{border:1px solid var(--line);padding:6px 9px;text-align:left;}
.cer-table th{background:var(--card2);font-weight:800;white-space:nowrap;}
.cer-table td b{color:var(--pri-ink);}

/* ---------- FAQ ---------- */
.cer-faq{margin-top:34px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 26px;box-shadow:var(--shadow);}
.cer-faq h2{margin:0 0 12px;font-size:19px;font-weight:900;}
.cer-faq h3{margin:18px 0 6px;font-size:15.5px;font-weight:800;color:var(--pri-ink);}
.cer-faq p{margin:0;color:var(--sub);font-size:14px;}
.cer-faq p b{color:var(--ink);}