:root {
  color-scheme: dark;
  --bg: #080b0d;
  --panel: rgba(17, 22, 25, 0.88);
  --panel-2: #151b1f;
  --line: #273137;
  --text: #f0f5f3;
  --muted: #84918e;
  --cyan: #5af2d0;
  --green: #b8ff5a;
  --amber: #ffca5c;
  --red: #ff6b6b;
  --radius: 18px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 82% 8%, rgba(90, 242, 208, .10), transparent 32rem),
    radial-gradient(circle at 8% 72%, rgba(184, 255, 90, .06), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
}
.noise {
  position: fixed; inset: 0; pointer-events: none; opacity: .16;
  background-image: linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 24px 24px;
}
.shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 34px 0 70px; position: relative; }
.topbar { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 26px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -.055em; }
h2 { margin-bottom: 0; font-size: 1.2rem; letter-spacing: -.02em; }
.eyebrow { color: var(--cyan); font: 700 .71rem/1.2 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .16em; margin-bottom: 8px; }
.connection { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: .85rem; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: #56615f; box-shadow: 0 0 0 5px rgba(86,97,95,.12); }
.dot.online { background: var(--green); box-shadow: 0 0 18px rgba(184,255,90,.65); }
.panel { border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius); backdrop-filter: blur(14px); box-shadow: 0 20px 70px rgba(0,0,0,.22); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 18px; }
.upload-panel, .live-panel, .task-panel, .counters-panel, .history-panel, .log-panel { padding: 24px; }
.section-heading { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; margin-bottom: 20px; }
.pill { display: inline-flex; align-items: center; min-height: 26px; padding: 4px 10px; border: 1px solid rgba(90,242,208,.32); color: var(--cyan); background: rgba(90,242,208,.08); border-radius: 999px; font: 700 .7rem ui-monospace, Consolas, monospace; white-space: nowrap; }
.pill.neutral { border-color: var(--line); color: var(--muted); background: rgba(255,255,255,.03); }
.pill.pass { border-color: rgba(184,255,90,.42); color: var(--green); background: rgba(184,255,90,.09); }
.pill.fail { border-color: rgba(255,107,107,.4); color: var(--red); background: rgba(255,107,107,.09); }
.drop-zone { display: grid; place-items: center; min-height: 180px; padding: 20px; border: 1px dashed #415059; border-radius: 14px; cursor: pointer; transition: .2s ease; text-align: center; }
.drop-zone:hover, .drop-zone.drag { border-color: var(--cyan); background: rgba(90,242,208,.045); transform: translateY(-1px); }
.drop-zone strong { margin: 11px 0 5px; }
.drop-zone small, .muted { color: var(--muted); }
.upload-icon { width: 54px; height: 54px; display: grid; place-items: center; border-radius: 13px; background: var(--cyan); color: #07110f; font: 900 .82rem ui-monospace, Consolas, monospace; box-shadow: 0 0 30px rgba(90,242,208,.18); }
button, input { font: inherit; }
button { border: 0; cursor: pointer; }
.primary, .login-row button { width: 100%; margin-top: 14px; min-height: 46px; border-radius: 11px; background: var(--cyan); color: #06110f; font-weight: 800; transition: .2s ease; }
.primary:hover:not(:disabled), .login-row button:hover { filter: brightness(1.08); transform: translateY(-1px); }
.primary:disabled { opacity: .36; cursor: not-allowed; }
.compact { font-size: .78rem; margin: 12px 0 0; }
.display-wrap { background: #050708; border: 1px solid #232c30; border-radius: 13px; padding: 16px 18px; margin-bottom: 22px; }
.display-wrap span, .led-header span { color: var(--muted); font: 700 .67rem ui-monospace, Consolas, monospace; letter-spacing: .14em; }
.display-wrap output { display: block; margin-top: 7px; color: var(--green); font: 700 clamp(2.2rem, 6vw, 4.2rem)/1 ui-monospace, Consolas, monospace; letter-spacing: .08em; text-shadow: 0 0 22px rgba(184,255,90,.26); }
.led-header { display: flex; justify-content: space-between; margin-bottom: 12px; }
.led-header code { color: var(--cyan); }
.led-bank { display: grid; grid-template-columns: repeat(8, 1fr); gap: 10px; }
.led { aspect-ratio: 1; border-radius: 50%; border: 1px solid #374248; background: #101517; position: relative; }
.led::after { content: attr(data-bit); position: absolute; inset: auto 0 -20px; text-align: center; color: #65716f; font: .63rem ui-monospace, Consolas, monospace; }
.led.on { background: var(--green); border-color: #e0ffad; box-shadow: 0 0 22px rgba(184,255,90,.7), inset 0 0 8px white; }
.task-panel, .counters-panel { margin-top: 18px; }
.progress-track { height: 5px; background: #20282c; border-radius: 999px; overflow: hidden; }
#progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--cyan), var(--green)); transition: width .35s ease; }
.task-message { color: #c2ccca; margin: 15px 0 0; }
.counter-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.counter { padding: 15px; min-height: 86px; border: 1px solid var(--line); background: rgba(5,8,9,.54); border-radius: 12px; }
.counter span { display: block; color: var(--muted); font-size: .69rem; margin-bottom: 9px; }
.counter strong { font: 700 1rem ui-monospace, Consolas, monospace; color: #e5eeec; overflow-wrap: anywhere; }
.lower-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 18px; margin-top: 18px; }
.history-list { display: grid; gap: 8px; max-height: 360px; overflow: auto; }
.history-item { width: 100%; margin: 0; padding: 12px; display: grid; grid-template-columns: 1fr auto; gap: 5px 12px; border: 1px solid transparent; border-radius: 10px; background: #101518; color: var(--text); text-align: left; }
.history-item:hover, .history-item.active { border-color: #405057; }
.history-item small { color: var(--muted); overflow: hidden; text-overflow: ellipsis; }
.history-item code { color: var(--cyan); font-size: .69rem; }
pre { margin: 0; height: 360px; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; padding: 16px; border-radius: 12px; background: #050708; color: #9eb0ac; font: .72rem/1.65 ui-monospace, Consolas, monospace; }
.login-card { width: min(620px, 100%); margin: 10vh auto 0; padding: 34px; }
.login-mark { float: right; color: rgba(90,242,208,.16); font: 900 4.2rem/1 ui-monospace, Consolas, monospace; letter-spacing: -.1em; }
.login-card h2 { font-size: 1.8rem; margin-bottom: 11px; }
.login-card label { display: block; margin: 24px 0 8px; color: var(--muted); font-size: .78rem; }
.login-row { display: grid; grid-template-columns: 1fr 140px; gap: 10px; }
.login-row input { min-width: 0; min-height: 46px; padding: 0 13px; color: var(--text); background: #080b0d; border: 1px solid #384348; border-radius: 10px; outline: none; }
.login-row input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(90,242,208,.08); }
.login-row button { margin-top: 0; }
.error { color: var(--red); min-height: 1.2em; margin: 10px 0 0; font-size: .8rem; }
[hidden] { display: none !important; }

@media (max-width: 800px) {
  .shell { width: min(100% - 20px, 700px); padding-top: 22px; }
  .topbar { align-items: flex-start; }
  .hero-grid, .lower-grid { grid-template-columns: 1fr; }
  .counter-grid { grid-template-columns: repeat(2, 1fr); }
  .display-wrap output { font-size: clamp(2.2rem, 12vw, 4rem); }
}
@media (max-width: 480px) {
  .connection { display: none; }
  .upload-panel, .live-panel, .task-panel, .counters-panel, .history-panel, .log-panel, .login-card { padding: 18px; }
  .login-row { grid-template-columns: 1fr; }
  .counter-grid { grid-template-columns: 1fr 1fr; }
}