/* ===== Màu: tối (mặc định) ===== */
:root{
  --ink:#EEF4FA;--mut:#8FA3BF;--line:#1C2940;--line2:#2B3B57;--bg:#070C16;--card:#0F1727;--card2:#142035;
  --cardg1:#111B2D;--cardg2:#0C1423;--field:#0A101C;--topbg:rgba(13,21,36,.94);--tabbg:#0A111E;--track:#1A2638;
  --page:radial-gradient(1200px 600px at 70% -10%,#0B3A44,#04070E 60%);
  --pri:#2DE2D0;--priInk:#04201D;--priTxt:#7FF3E6;--pri2:rgba(45,226,208,.14);--glow:0 0 22px rgba(45,226,208,.45);--glowS:0 0 14px rgba(45,226,208,.35);
  --pink:#FF8A9A;--pinkS:rgba(255,138,154,.13);--blue:#7FB0FF;--blueS:rgba(127,176,255,.13);--teal:#43E6CC;--tealS:rgba(67,230,204,.12);
  --amb:#FFC453;--ambS:rgba(255,196,83,.13);--ok:#5EF0B8;--okS:rgba(94,240,184,.12);
  --heroTxt:#DCD9FF;--bigTxt:#CDBFD9;--toastBg:#10233A;--shade:rgba(3,6,12,.7);--shadow:0 0 60px rgba(45,226,208,.15);
  --ill-ink:#EEF4FA;--ill-d:#0F1727;--ill-d2:#142035;--ill-l:#2B3B57;
  color-scheme:dark;
}
/* ===== Màu: sáng ===== */
:root[data-theme="light"]{
  --ink:#0E1A2B;--mut:#5B6B82;--line:#E3E9F1;--line2:#CBD5E1;--bg:#F5F8FC;--card:#FFFFFF;--card2:#F0F4F9;
  --cardg1:#FFFFFF;--cardg2:#FBFCFE;--field:#FFFFFF;--topbg:rgba(255,255,255,.94);--tabbg:#FFFFFF;--track:#E3E9F1;
  --page:radial-gradient(1200px 600px at 70% -10%,#D7F7F3,#EEF3F9 60%);
  --pri:#14C9B7;--priInk:#032420;--priTxt:#0A7E73;--pri2:rgba(20,201,183,.12);--glow:0 6px 18px rgba(20,201,183,.32);--glowS:0 4px 12px rgba(20,201,183,.28);
  --pink:#D9475E;--pinkS:rgba(217,71,94,.10);--blue:#2563EB;--blueS:rgba(37,99,235,.10);--teal:#0E9F8E;--tealS:rgba(14,159,142,.10);
  --amb:#B7791F;--ambS:rgba(214,158,46,.14);--ok:#0E9F6E;--okS:rgba(14,159,110,.10);
  --heroTxt:#E8F7FF;--bigTxt:#4A5A70;--toastBg:#FFFFFF;--shade:rgba(15,23,42,.45);--shadow:0 10px 40px rgba(15,23,42,.08);
  --ill-ink:#0E1A2B;--ill-d:#FFFFFF;--ill-d2:#EEF3F9;--ill-l:#CBD5E1;
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--ink);background:var(--page);background-color:var(--bg);-webkit-font-smoothing:antialiased}
button{font-family:inherit;cursor:pointer;color:var(--ink)}
button:disabled{opacity:.55;cursor:default}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--priTxt);outline-offset:2px}
a{color:var(--priTxt)}
.illus{display:block;height:auto}
.phone{width:100%;max-width:480px;height:100vh;height:100dvh;margin:0 auto;background:var(--bg);position:relative;display:flex;flex-direction:column;overflow:hidden}
@media (min-width:600px){.phone{border-left:1px solid var(--line);border-right:1px solid var(--line);box-shadow:var(--shadow)}}
.top{padding:calc(12px + env(safe-area-inset-top)) 18px 10px;background:var(--topbg);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;min-height:60px}
.top .back{width:40px;height:40px;border-radius:12px;border:none;background:var(--bg);display:flex;align-items:center;justify-content:center}
.top h2{margin:0;font-size:25px;font-weight:800;flex:1;font-family:'Barlow Condensed',sans-serif;text-transform:uppercase;letter-spacing:.01em}
.logo{width:36px;height:36px;display:flex;align-items:center;justify-content:center;flex:none}
.logo .mascot{display:block}
.chipc{font-size:12px;font-weight:700;padding:6px 10px;border-radius:999px;background:var(--pri2);color:var(--priTxt);white-space:nowrap;border:none}
.scroll{flex:1;overflow-y:auto;padding:16px 16px 24px;display:flex;flex-direction:column;gap:14px}
.scroll>*{flex-shrink:0}
.tabs{display:grid;grid-template-columns:repeat(5,1fr);background:var(--tabbg);border-top:1px solid var(--line);padding:6px 4px calc(10px + env(safe-area-inset-bottom))}
.tab{border:none;background:none;display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11.5px;font-weight:600;color:var(--mut);min-height:52px;justify-content:center}
.tab.on{color:var(--priTxt);font-weight:800}
.tab .plus{width:46px;height:46px;border-radius:16px;background:var(--pri);color:var(--priInk);display:flex;align-items:center;justify-content:center;margin-top:-6px;box-shadow:var(--glow)}
.card{background:linear-gradient(180deg,var(--cardg1),var(--cardg2));border:1px solid var(--line);border-radius:20px;padding:16px;display:flex;flex-direction:column;gap:10px}
:root[data-theme="light"] .card{box-shadow:0 1px 3px rgba(15,23,42,.05)}
.h{font-size:15px;font-weight:800;margin:0}
.sub{font-size:13px;color:var(--mut);line-height:1.5;margin:0}
.btn{min-height:50px;border-radius:16px;border:none;background:var(--pri);color:var(--priInk);width:100%;box-shadow:var(--glow);text-transform:uppercase;font-family:'Barlow Condensed',sans-serif;font-size:20px;font-weight:800;letter-spacing:.03em}
.btn2{min-height:44px;border-radius:14px;border:1.5px solid var(--line2);background:var(--card);color:var(--ink);font-size:14px;font-weight:700;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;gap:6px}
.btnx{min-height:44px;border-radius:14px;border:1.5px solid color-mix(in srgb,var(--pink) 45%,transparent);background:transparent;color:var(--pink);font-size:14px;font-weight:700;padding:0 14px}
.row{display:flex;align-items:center;gap:10px}
.wrap{flex-wrap:wrap;gap:6px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.pill{min-height:40px;padding:0 14px;border-radius:999px;border:1.5px solid var(--line2);background:var(--card);font-size:13.5px;font-weight:600;color:var(--ink)}
.pill.on{background:var(--pri);border-color:var(--pri);color:var(--priInk);box-shadow:var(--glowS)}
.tag{font-size:11.5px;font-weight:700;padding:4px 9px;border-radius:999px;white-space:nowrap}
.ico{width:42px;height:42px;border-radius:13px;display:flex;align-items:center;justify-content:center;flex:none}
.big{border:none;text-align:left;border-radius:22px;padding:18px;display:flex;flex-direction:column;gap:6px;color:var(--ink);position:relative;overflow:hidden}
.big b{font-size:22px;font-weight:800;font-family:'Barlow Condensed',sans-serif;text-transform:uppercase;letter-spacing:.01em}
.big span{font-size:13px;line-height:1.45;color:var(--bigTxt)}
.big .bigill{position:absolute;right:-10px;bottom:-12px;width:46%;opacity:.95;pointer-events:none}
.big .bigtxt{position:relative;max-width:64%}
.hero{background:linear-gradient(135deg,#0FB9A8,#2459E0);box-shadow:0 0 30px rgba(45,226,208,.4)}
.disp{font-size:44px;font-weight:800;line-height:.95;font-family:'Barlow Condensed',sans-serif;text-transform:uppercase;letter-spacing:.01em}
.disp em{font-style:normal;color:var(--priTxt);text-shadow:0 0 18px color-mix(in srgb,var(--pri) 60%,transparent)}
.greet{display:flex;align-items:center;gap:8px}
.greet .illus{width:42%;max-width:190px;flex:none}
.prog{height:8px;border-radius:4px;background:var(--track);overflow:hidden}.prog i{display:block;height:100%;background:var(--pri);border-radius:4px;transition:width .4s}
.chat{display:flex;flex-direction:column;gap:8px}
.me{align-self:flex-end;background:var(--pri);color:var(--priInk);padding:10px 14px;border-radius:18px 18px 6px 18px;font-size:14.5px;max-width:85%;white-space:pre-wrap}
.ai{align-self:flex-start;background:var(--card);border:1px solid var(--line);padding:10px 14px;border-radius:18px 18px 18px 6px;font-size:14.5px;line-height:1.5;max-width:88%;white-space:pre-wrap}
.inp{display:flex;gap:8px;align-items:center;background:var(--card);border:1.5px solid var(--line2);border-radius:16px;padding:5px 5px 5px 14px}
.inp input{flex:1;border:none;outline:none;font:inherit;font-size:15px;min-height:42px;background:transparent;color:var(--ink)}
.sq{width:42px;height:42px;border-radius:13px;border:none;display:flex;align-items:center;justify-content:center;flex:none}
.toggle{width:46px;height:28px;border-radius:14px;border:none;position:relative;flex:none}
.toggle i{position:absolute;top:3px;width:22px;height:22px;border-radius:50%;background:#fff;transition:left .2s}
textarea,.field{width:100%;border-radius:14px;border:1.5px solid var(--line2);padding:10px 12px;font:inherit;font-size:15px;line-height:1.5;background:var(--field);color:var(--ink)}
textarea{resize:vertical}
.field{min-height:48px}
label.lb,span.lb{font-size:13px;font-weight:700;color:var(--mut);display:block;margin-bottom:6px}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:4px;border-radius:14px;background:var(--bg)}
.seg button{min-height:40px;border:none;border-radius:11px;background:transparent;color:var(--mut);font-weight:700;display:flex;align-items:center;justify-content:center;gap:6px;font-family:'Barlow Condensed';text-transform:uppercase;font-size:17px}
.seg button .n{font-family:'Barlow Condensed';font-size:22px;font-weight:800;color:transparent;-webkit-text-stroke:1.2px var(--mut)}
.seg button.on{background:var(--card);color:var(--priTxt);box-shadow:0 1px 3px color-mix(in srgb,var(--pri) 35%,transparent)}
.seg button.on .n{-webkit-text-stroke:1.2px var(--priTxt)}
.sb{background:var(--bg);border-radius:12px;padding:10px 12px;font-size:14.5px;line-height:1.5;white-space:pre-wrap}.sb span{display:block;font-size:11.5px;font-weight:800;color:var(--priTxt);margin-bottom:2px}
.sheetbg{position:fixed;inset:0;background:var(--shade);z-index:20;display:flex;align-items:flex-end;justify-content:center}
.sheet{background:var(--card);border-top:1px solid var(--line2);border-radius:24px 24px 0 0;padding:20px 18px calc(26px + env(safe-area-inset-bottom));width:100%;max-width:520px;display:flex;flex-direction:column;gap:12px}
.istep{display:flex;gap:12px;align-items:center;font-size:15px;line-height:1.45}.istep b.k{width:30px;height:30px;border-radius:10px;background:var(--pri2);color:var(--priTxt);display:flex;align-items:center;justify-content:center;flex:none;font-family:'Barlow Condensed';font-size:18px}
.toast{position:fixed;left:50%;transform:translateX(-50%);width:min(448px,calc(100% - 32px));bottom:96px;background:var(--toastBg);border:1px solid var(--pri);box-shadow:var(--glow);color:var(--ink);border-radius:16px;padding:12px 14px;font-size:14px;font-weight:600;z-index:30}
.toast.err{border-color:var(--pink);box-shadow:0 0 22px color-mix(in srgb,var(--pink) 35%,transparent)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.soon{border-style:dashed;align-items:flex-start}
.soon .illus{width:120px;align-self:center}
.empty{align-items:center;text-align:center}
.empty .illus{width:150px}
.center{flex:1;display:flex;align-items:center;justify-content:center}
.spin{width:36px;height:36px;border-radius:50%;border:3px solid var(--line2);border-top-color:var(--pri);animation:sp 1s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.stepbar{display:flex;gap:4px}.stepbar i{flex:1;height:5px;border-radius:3px;background:var(--line2)}.stepbar i.on{background:var(--pri);box-shadow:0 0 8px color-mix(in srgb,var(--pri) 60%,transparent)}
.list-item{display:flex;align-items:center;gap:10px;padding:10px 0;border-top:1px solid var(--line)}
.list-item:first-of-type{border-top:none}
.themebtn{position:absolute;top:calc(12px + env(safe-area-inset-top));right:14px;z-index:5}
.seg3{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.seg3 button{min-height:44px;border-radius:14px;border:1.5px solid var(--line2);background:var(--card);font-weight:700;font-size:14px;color:var(--ink);display:flex;align-items:center;justify-content:center;gap:6px}
.seg3 button.on{border-color:var(--pri);background:var(--pri2);color:var(--priTxt)}
.coachill{width:110px;align-self:center}

/* ===== Bản máy tính: chi tiết, 3 cột ===== */
.desk{display:grid;grid-template-columns:248px minmax(0,1fr);height:100vh;height:100dvh;background:var(--bg)}
.desk.wr{grid-template-columns:248px minmax(0,1fr) 320px}
.side{border-right:1px solid var(--line);padding:22px 14px;display:flex;flex-direction:column;gap:4px;overflow-y:auto;background:var(--tabbg)}
.side .brand{display:flex;align-items:center;gap:10px;padding:0 8px 18px;font-weight:800;font-size:20px}
.navi{display:flex;align-items:center;gap:12px;padding:8px 10px;border-radius:14px;border:none;background:none;color:var(--ink);font-size:15px;font-weight:600;text-align:left;width:100%}
.navi .ico{width:34px;height:34px;border-radius:11px}
.navi:hover{background:var(--card2)}
.navi.on{background:var(--pri2);color:var(--priTxt);font-weight:800}
.side hr{border:none;border-top:1px solid var(--line);margin:10px 8px;width:auto}
.side .foot{margin-top:auto;display:flex;flex-direction:column;gap:10px}
.dmain{display:flex;flex-direction:column;min-width:0;overflow:hidden}
.dmain .top{padding:16px 32px;background:transparent;border-bottom:1px solid var(--line)}
.dmain .top .logo{display:none}
.side .brand .logo{width:40px;height:40px}
.dmain .top h2{font-size:30px}
.dmain .scroll{padding:24px 32px 40px;gap:18px}
.dmain .scroll>*{max-width:1100px;width:100%}
.rpanel{border-left:1px solid var(--line);padding:22px 18px;overflow-y:auto;display:flex;flex-direction:column;gap:14px;background:var(--tabbg)}
.rpanel h3{margin:0 0 4px;font-size:18px;font-weight:800}
.dept{display:flex;gap:12px;align-items:flex-start}
.dept .ico{width:40px;height:40px}
.dgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:18px;align-items:start}
.split>div{display:flex;flex-direction:column;gap:14px}
.desk .big{min-height:150px}
.desk .greet .illus{width:280px;max-width:none}
.desk .disp{font-size:56px}
.weekgrid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:10px}
.wday{background:linear-gradient(180deg,var(--cardg1),var(--cardg2));border:1px solid var(--line);border-radius:16px;padding:10px;min-height:220px;display:flex;flex-direction:column;gap:8px}
.wday.today{border-color:var(--pri)}
.wday .dh{display:flex;justify-content:space-between;align-items:baseline;font-weight:700;font-size:13px;color:var(--mut)}
.wday .dh b{font-size:22px;color:var(--ink)}
.wpost{background:var(--bg);border-radius:10px;padding:8px;font-size:12.5px;line-height:1.35;display:flex;flex-direction:column;gap:4px}
.wpost .t{font-weight:800;color:var(--priTxt)}
.stat{display:flex;flex-direction:column;gap:2px}.stat b{font-size:28px;font-weight:800}
.desk .tabs{display:none}
.desk .chatwrap{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:18px;align-items:start}
.desk .toast{bottom:28px}