:root {
  --bg-deep: #05080c;
  --bg-panel: #0d141c;
  --bg-panel-alt: #111c26;
  --border-col: #1f3040;
  --accent: #2ea8ff;
  --accent-dim: #1a5c8a;
  --warn: #eca416;
  --danger: #ff4d4d;
  --ok: #3ddc84;
  --text-main: #d8e6f0;
  --text-dim: #7f95a6;
  --mono: "Share Tech Mono", "Consolas", monospace;
  --sans: "Oswald", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--sans);
  letter-spacing: 0.2px;
}

body {
  background-image:
    radial-gradient(circle at 20% 10%, rgba(46,168,255,0.06), transparent 40%),
    radial-gradient(circle at 80% 90%, rgba(236,164,22,0.05), transparent 40%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* ---------- HEADER ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: linear-gradient(180deg, #0d141c, #0a0f15);
  border-bottom: 1px solid var(--border-col);
}
.app-header .brand {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 2px;
  color: var(--accent);
  text-transform: uppercase;
}
.app-header .brand span { color: var(--warn); }
.header-right { display: flex; align-items: center; gap: 14px; font-family: var(--mono); font-size: 13px; color: var(--text-dim); }

/* ---------- LAYOUT ---------- */
.main-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.screen { width: 100%; max-width: 1100px; }

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border-col);
  border-radius: 10px;
  padding: 32px;
  box-shadow: 0 0 0 1px rgba(46,168,255,0.03), 0 20px 50px rgba(0,0,0,0.5);
}

.card h1 {
  font-family: var(--mono);
  font-size: 22px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-top: 0;
}
.card h2 { font-family: var(--mono); font-size: 16px; color: var(--warn); text-transform: uppercase; letter-spacing: 1px; }
.subtle { color: var(--text-dim); font-size: 14px; }

/* ---------- FORMS ---------- */
input[type="text"], input[type="password"], select {
  background: #0a1119;
  border: 1px solid var(--border-col);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 14px;
  width: 100%;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 6px;
  border: 1px solid var(--border-col);
  background: var(--bg-panel-alt);
  color: var(--text-main);
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all .15s ease;
  text-transform: uppercase;
  font-size: 13px;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: linear-gradient(180deg, var(--accent), var(--accent-dim)); color: #041018; border: none; font-weight: 700; }
.btn-primary:hover { filter: brightness(1.1); color: #041018; }
.btn-block { width: 100%; margin-top: 18px; }

.btn-clear {
  background: linear-gradient(180deg, #3ddc84, #1f8f52);
  border: none; color: #04180c; font-weight: 800; font-size: 15px; padding: 16px;
}
.btn-hold {
  background: linear-gradient(180deg, #ff4d4d, #a11f1f);
  border: none; color: #1a0202; font-weight: 800; font-size: 15px; padding: 16px;
}
.btn-clear:hover, .btn-hold:hover { filter: brightness(1.08); }

.icon-btn {
  background: none; border: 1px solid var(--border-col); color: var(--text-dim);
  border-radius: 50%; width: 32px; height: 32px; cursor: pointer; font-family: var(--mono);
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- LOGIN / START ---------- */
.field-group { margin-bottom: 18px; }
.field-group label { display: block; font-size: 12px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 6px; }

.difficulty-info {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0;
}
.difficulty-info div {
  background: var(--bg-panel-alt); border: 1px solid var(--border-col); border-radius: 6px;
  padding: 10px; font-family: var(--mono); font-size: 12px; text-align: center; color: var(--text-dim);
}

/* ---------- TRAINER SCREEN ---------- */
.trainer-layout { display: grid; grid-template-columns: 1fr 220px; gap: 18px; }

.canvas-wrap { position: relative; background: #000; border: 1px solid var(--border-col); border-radius: 8px; overflow: hidden; }
#xray-canvas { display: block; width: 100%; height: auto; }

.hud-top { position: absolute; top: 8px; left: 12px; right: 12px; display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: rgba(150,210,255,0.6); pointer-events: none; }

.timer-track { height: 6px; background: #0a1119; border-radius: 3px; overflow: hidden; margin: 10px 0 4px; }
.timer-bar { height: 100%; width: 100%; background: var(--ok); transition: width 1s linear, background .3s ease; }
.timer-row { display: flex; justify-content: space-between; align-items: center; font-family: var(--mono); font-size: 12px; color: var(--text-dim); }

.filter-toolbar { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; margin-top: 14px; }
.filter-btn {
  background: var(--bg-panel-alt); border: 1px solid var(--border-col); color: var(--text-dim);
  border-radius: 6px; padding: 8px 2px; font-family: var(--mono); font-size: 11px; cursor: pointer; text-align: center; line-height: 1.3;
}
.filter-btn .key { display: block; font-size: 14px; color: var(--accent); font-weight: 700; }
.filter-btn.active { border-color: var(--accent); background: rgba(46,168,255,0.12); color: var(--accent); }
.filter-btn:hover { border-color: var(--accent); }

.decision-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }

.side-panel { display: flex; flex-direction: column; gap: 14px; }
.badge { align-self: flex-start; font-family: var(--mono); font-size: 11px; padding: 5px 10px; border-radius: 4px; letter-spacing: 1px; }
.badge-practice { background: rgba(61,220,132,0.15); color: var(--ok); border: 1px solid var(--ok); }
.badge-exam { background: rgba(255,77,77,0.15); color: var(--danger); border: 1px solid var(--danger); }

.progress-box, .sound-box { background: var(--bg-panel-alt); border: 1px solid var(--border-col); border-radius: 8px; padding: 12px; font-family: var(--mono); font-size: 13px; }

.legend-box { background: var(--bg-panel-alt); border: 1px solid var(--border-col); border-radius: 8px; padding: 12px; font-size: 12px; color: var(--text-dim); }
.legend-box .dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }

.feedback-panel { margin-top: 14px; padding: 14px 16px; border-radius: 8px; border: 1px solid var(--border-col); }
.feedback-correct { background: rgba(61,220,132,0.1); border-color: var(--ok); }
.feedback-wrong { background: rgba(255,77,77,0.1); border-color: var(--danger); }
.feedback-panel .fb-title { font-weight: 700; margin-bottom: 4px; }
.feedback-panel .fb-detail { font-size: 13px; color: var(--text-dim); }

/* ---------- RESULTS ---------- */
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 22px 0; }
.result-tile { background: var(--bg-panel-alt); border: 1px solid var(--border-col); border-radius: 8px; padding: 18px; text-align: center; }
.result-tile .val { font-family: var(--mono); font-size: 26px; color: var(--accent); }
.result-tile .lab { font-size: 11px; text-transform: uppercase; color: var(--text-dim); letter-spacing: 1px; margin-top: 4px; }

/* ---------- MODAL ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal-box { background: var(--bg-panel); border: 1px solid var(--border-col); border-radius: 10px; padding: 26px; max-width: 640px; width: 92%; max-height: 82vh; overflow-y: auto; }
.modal-box table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 13px; }
.modal-box td, .modal-box th { border-bottom: 1px solid var(--border-col); padding: 8px 6px; text-align: left; }

/* ---------- ADMIN ---------- */
.admin-nav { display: flex; gap: 10px; margin-bottom: 18px; }
.admin-nav a {
  color: var(--text-dim); text-decoration: none; font-family: var(--mono); font-size: 12px; text-transform: uppercase;
  padding: 8px 14px; border: 1px solid var(--border-col); border-radius: 6px;
}
.admin-nav a.active, .admin-nav a:hover { color: var(--accent); border-color: var(--accent); }

table.data-table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 12.5px; }
table.data-table th { text-align: left; padding: 10px 8px; color: var(--text-dim); border-bottom: 1px solid var(--border-col); text-transform: uppercase; font-size: 11px; letter-spacing: 0.5px; }
table.data-table td { padding: 9px 8px; border-bottom: 1px solid rgba(31,48,64,0.5); }
table.data-table tr:hover td { background: rgba(46,168,255,0.04); }
table.data-table a { color: var(--accent); text-decoration: none; }

.settings-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 600px; }
.settings-form .full { grid-column: 1 / -1; }

.flash { padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 16px; }
.flash-ok { background: rgba(61,220,132,0.12); border: 1px solid var(--ok); color: var(--ok); }
.flash-err { background: rgba(255,77,77,0.12); border: 1px solid var(--danger); color: var(--danger); }

@media (max-width: 820px) {
  .trainer-layout { grid-template-columns: 1fr; }
  .filter-toolbar { grid-template-columns: repeat(4, 1fr); }
  .result-grid { grid-template-columns: repeat(2, 1fr); }
  .settings-form { grid-template-columns: 1fr; }
}