:root {
  --bg: #0A0A0A; --panel: #111113; --panel2: #17171A; --line: #232327; --line2: #2A2A30;
  --text: #F2F3F5; --soft: #C4C4CC; --muted: #8B8B93; --green: #00C27A; --red: #FF5A5F;
  --yellow: #F5B83D; --blue: #4C9DFF;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.45 Inter, system-ui, sans-serif; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--green); }
.boot, .loading { padding: 60px; text-align: center; color: var(--muted); }
.muted { color: var(--muted); }

/* header */
.top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; padding: 16px 24px; border-bottom: 1px solid #1C1C20; }
.brand { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.brand h1 { margin: 0; font: 400 32px/1 Anton, Impact, sans-serif; letter-spacing: .02em; }
.brand h1 span { color: var(--green); }
.brand .sub { font: 18px 'Bebas Neue', sans-serif; letter-spacing: .06em; color: #A1A1AA; }
.me { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.me img { width: 28px; height: 28px; border-radius: 50%; }
.link { color: var(--muted); font-size: 12px; }
.seg { display: flex; background: #141416; border: 1px solid #26262B; border-radius: 10px; padding: 4px; gap: 4px; flex-wrap: wrap; }
.seg button { height: 36px; padding: 0 14px; border: 0; border-radius: 7px; background: transparent; color: var(--soft); font-weight: 600; font-size: 13px; cursor: pointer; }
.seg button.on { background: var(--green); color: #0A0A0A; }

/* layout */
.wrap { padding: 20px 24px 40px; max-width: 1500px; margin: 0 auto; }
.cols { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-start; }
.side { flex: 1 1 280px; max-width: 340px; min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.mainc { flex: 999 1 560px; min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.label { font: 16px 'Bebas Neue', sans-serif; letter-spacing: .08em; color: #A1A1AA; }
.label.green { color: var(--green); }
h2.big { margin: 10px 0 4px; font: 400 30px/1 'Bebas Neue', sans-serif; letter-spacing: .02em; }
.task { margin: 14px 0 12px; font-size: 15px; font-weight: 600; }
.rules { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 13px; color: var(--soft); }
.tag { margin-top: 10px; display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--green); color: var(--green); font-size: 11px; font-weight: 700; letter-spacing: .04em; }
.empty { max-width: 520px; margin: 40px auto; text-align: center; }
.empty h2 { font: 400 30px 'Bebas Neue', sans-serif; letter-spacing: .03em; margin: 0 0 8px; }

/* badges */
.badge { display: inline-flex; align-items: center; gap: 5px; padding: 3px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; white-space: nowrap; }
.b-correct { color: var(--green); background: rgba(0,194,122,.14); }
.b-needs { color: var(--yellow); background: rgba(245,184,61,.14); }
.b-wrong { color: #FF6B6F; background: rgba(255,90,95,.14); }
.b-pending { color: #E4E4E7; background: rgba(228,228,231,.10); }
.b-none { color: #A1A1AA; background: rgba(161,161,170,.10); }

/* history */
.hist { display: grid; gap: 10px; margin-top: 12px; }
.hitem { text-align: left; width: 100%; background: var(--panel2); border: 1px solid #222226; border-radius: 10px; padding: 12px; cursor: pointer; }
.hitem.on { border-color: var(--green); }
.hitem .row { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.hitem p { margin: 8px 0 0; font-size: 12px; color: var(--soft); }
.hitem .t { font-weight: 600; font-size: 13px; }
.hitem .d { font-size: 11px; color: var(--muted); }

/* toolbar */
.bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; }
.tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.btn { height: 40px; padding: 0 14px; border-radius: 8px; border: 1px solid var(--line2); background: #18181B; color: #D4D4D8; font-weight: 600; font-size: 13px; display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.btn:disabled { opacity: .45; cursor: default; }
.btn.on-demand { border-color: var(--green); color: var(--green); background: rgba(0,194,122,.14); }
.btn.on-supply { border-color: var(--red); color: var(--red); background: rgba(255,90,95,.14); }
.btn.on-pan { border-color: #E4E4E7; color: #E4E4E7; background: rgba(228,228,231,.10); }
.btn.on-corr { border-color: var(--blue); color: var(--blue); background: rgba(76,157,255,.14); }
.sep { width: 1px; height: 24px; background: var(--line2); }
.count { font: 20px 'Bebas Neue', sans-serif; letter-spacing: .05em; color: #A1A1AA; }
.count.has { color: var(--green); }
.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12px; color: #A1A1AA; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 16px; height: 10px; display: inline-block; }
.sw.d { background: rgba(0,194,122,.22); border: 1.5px solid var(--green); }
.sw.s { background: rgba(255,90,95,.22); border: 1.5px solid var(--red); }
.sw.c { border: 2px dashed var(--blue); }

/* chart */
.chartbox { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.charthead { display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; align-items: center; padding: 10px 12px; border-bottom: 1px solid #1A1A1D; }
.charthead b { font-size: 13px; }
.hint { font-size: 12px; color: var(--muted); }
.zoom { display: flex; align-items: center; gap: 2px; background: #18181B; border: 1px solid var(--line2); border-radius: 8px; padding: 3px; }
.zoom button { min-width: 36px; height: 34px; padding: 0 8px; border: 0; border-radius: 6px; background: transparent; color: #D4D4D8; font-weight: 600; font-size: 12px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
.zoom button:hover { background: #222226; }
canvas.chart { display: block; width: 100%; height: 480px; outline: none; }

/* submit */
.submitrow { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; }
.field { flex: 999 1 320px; display: flex; flex-direction: column; gap: 6px; }
.field label, .flabel { font-size: 12px; font-weight: 600; color: #A1A1AA; }
textarea, input[type=text], input[type=date], input[type=datetime-local], select {
  background: var(--panel); border: 1px solid var(--line2); border-radius: 10px; color: var(--text); padding: 10px 12px; font-size: 13px;
}
textarea { min-height: 64px; resize: vertical; }
textarea:disabled { opacity: .6; }
.cta { flex: 1 1 200px; display: flex; flex-direction: column; gap: 8px; }
.go { height: 48px; border: 0; border-radius: 10px; background: var(--green); color: #0A0A0A; font: 22px 'Bebas Neue', sans-serif; letter-spacing: .06em; cursor: pointer; padding: 0 18px; }
.go:disabled { opacity: .45; cursor: default; }
.ghost { height: 48px; border-radius: 10px; border: 1px solid var(--line2); background: #18181B; color: #E4E4E7; font-weight: 600; cursor: pointer; padding: 0 16px; }
.small { font-size: 12px; color: var(--muted); text-align: center; }

/* banner */
.banner { display: grid; gap: 8px; border-color: var(--line2); }
.banner .head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.banner .title { font: 20px 'Bebas Neue', sans-serif; letter-spacing: .05em; }
.banner p { margin: 0; font-size: 14px; color: #E4E4E7; white-space: pre-wrap; }
.banner .feat { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 600; color: var(--green); }

/* teacher */
.gradetop { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.gradetop .l { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.queue { display: grid; gap: 10px; }
.qitem { text-align: left; width: 100%; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px; cursor: pointer; display: flex; align-items: center; gap: 12px; }
.qitem.on { background: #1A1A1E; border-color: var(--green); }
.av { width: 36px; height: 36px; flex: none; border-radius: 50%; background: #5865F2; color: #fff; font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.av img { width: 100%; height: 100%; }
.qmain { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.qname { font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.qmeta { font-size: 11px; color: var(--muted); }
.rhead { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; gap: 12px; }
.rhead h2 { margin: 0; font: 400 30px/1 'Bebas Neue', sans-serif; letter-spacing: .03em; }
.note { max-width: 460px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.note .k { font-size: 11px; font-weight: 700; letter-spacing: .05em; color: var(--muted); margin-bottom: 4px; }
.note .v { font-size: 13px; color: #E4E4E7; white-space: pre-wrap; }
.switch { margin-top: 8px; height: 40px; padding: 0 14px 0 10px; border-radius: 999px; border: 1px solid var(--line2); background: var(--panel); font-size: 13px; font-weight: 600; display: inline-flex; align-items: center; gap: 10px; cursor: pointer; }
.switch.on { border-color: var(--green); }
.switch .track { position: relative; width: 36px; height: 20px; border-radius: 10px; background: #3F3F46; flex: none; }
.switch.on .track { background: var(--green); }
.switch .knob { position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 50%; background: #fff; transition: left .15s; }
.switch.on .knob { left: 18px; }
.grades { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.gbtn { height: 44px; padding: 0 18px; border-radius: 10px; border: 1.5px solid; background: transparent; font-weight: 700; font-size: 14px; display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.gbtn.correct { border-color: var(--green); color: var(--green); } .gbtn.correct.on { background: var(--green); color: #0A0A0A; }
.gbtn.needs { border-color: var(--yellow); color: var(--yellow); } .gbtn.needs.on { background: var(--yellow); color: #0A0A0A; }
.gbtn.wrong { border-color: #FF6B6F; color: #FF6B6F; } .gbtn.wrong.on { background: #FF6B6F; color: #0A0A0A; }
.kbd { font-size: 11px; color: var(--muted); }

/* post */
.form { display: grid; gap: 14px; }
.form .row2 { display: flex; flex-wrap: wrap; gap: 14px; }
.form .row2 > div { flex: 1 1 200px; display: flex; flex-direction: column; gap: 6px; }
.check { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.status { font-size: 12px; color: var(--soft); }
.status.err { color: #FF6B6F; }

/* login */
.login { min-height: 80vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.login .card { max-width: 440px; text-align: center; padding: 36px 28px; }
.login h1 { margin: 0 0 6px; font: 400 44px/1 Anton, Impact, sans-serif; }
.login h1 span { color: var(--green); }
.login p { color: var(--soft); }
.discord { display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 50px; padding: 0 24px; border-radius: 10px; background: #5865F2; color: #fff; font-weight: 700; text-decoration: none; margin-top: 10px; }
.err { color: #FF6B6F; font-size: 13px; }

#toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: #F2F3F5; color: #0A0A0A; font-weight: 600; font-size: 13px; padding: 10px 16px; border-radius: 8px; box-shadow: 0 8px 24px rgba(0,0,0,.5); opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 10; }
#toast.show { opacity: 1; }

@media (max-width: 700px) {
  .wrap { padding: 14px; }
  .side { max-width: none; }
  canvas.chart { height: 380px; }
}