:root {
  --bg: #0b1020;
  --panel: #11182f;
  --accent: #6ea8fe;
  --text: #e9eefc;
  --muted: #9bb1d3;
  --good: #3ddc97;
  --warn: #ffd166;
  --bad: #ef476f;

  /* ===== Font sizes (ΠΑΙΖΕΙΣ ΕΔΩ) ===== */
  --fs-base: 13px;
  --fs-h1: 18px;
  --fs-h2: 15px;
  --fs-label: 12px;
  --fs-input: 12px;
  --fs-btn: 12px;
  --fs-status: 12px;
  --fs-legend: 11.5px;
  --fs-chart-card: 11.5px;
  --fs-chart-title: 12px;

  /* ===== Colors for bodies (no images) ===== */
  --body-M: #c9c9c9; /* light gray */
  --body-m: #5f5f5f; /* dark gray */
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #0b1020, #0a0f1f 60%, #0b0f1f);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Noto Sans", "Liberation Sans", sans-serif;
  font-size: var(--fs-base);
}

/* ===== Header ===== */
header {
  padding: 16px 22px;
  border-bottom: 1px solid #1f2b52;
  background: rgba(10, 16, 34, 0.6);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 5;
}

header h1 {
  font-size: var(--fs-h1);
  font-weight: 600;
  margin: 0;
}

.header-row {
  display: flex;
  justify-content: space-between; /* τίτλος αριστερά, controls δεξιά */
  align-items: center;
  gap: 12px;
}

/* Δεξιά “μπλοκ” για fullscreen + language */
.header-right {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

/* Fullscreen button (αριστερά από language) */
#fsBtn {
  appearance: none;
  border: 1px solid #2e417e;
  background: #0d1842;
  border-radius: 10px;
  padding: 6px 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#fsBtn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(110, 168, 254, 0.15) inset;
}

#fsBtn img {
  width: 16px;
  height: 16px;
  display: block;
}

/* Language */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-label);
  color: #cfe3ff;
}

.lang-switcher label {
  font-size: var(--fs-label);
}

.lang-switcher select {
  background: #0f1530;
  border: 1px solid #38456f;
  border-radius: 8px;
  color: #e9eefc;
  padding: 4px 8px;
  font-size: var(--fs-label);
}

/* ===== Layout ===== */
.wrap {
  display: grid;
  grid-template-columns: 360px 1fr 360px;
  gap: 18px;
  padding: 18px;
  min-height: calc(100vh - 64px);
}

@media (max-width: 1100px) {
  .wrap {
    grid-template-columns: 1fr;
  }
}

/* ===== Charts Panel ===== */
.charts {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chart-card {
  background: #0c1537;
  border: 1px solid #2a3a73;
  border-radius: 12px;
  padding: 8px 8px 4px;
  font-size: var(--fs-chart-card);
}

.chart-title {
  margin: 0 0 4px;
  font-size: var(--fs-chart-title);
  font-weight: 600;
  color: #cfe3ff;
}

@media (max-width: 1100px) {
  .charts {
    order: 3;
  }
}

/* ===== Controls Panel ===== */
.panel {
  background: var(--panel);
  border: 1px solid #1c274a;
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 10px 30px rgba(4, 8, 20, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.panel h2 {
  margin: 4px 0 10px;
  font-size: var(--fs-h2);
  font-weight: 600;
  color: #cfe3ff;
}

.controls .row {
  display: grid;
  grid-template-columns: 1fr 84px;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}

label {
  font-size: var(--fs-label);
  color: var(--muted);
}

.ctl {
  padding: 10px 10px 8px;
  background: #0c1330;
  border: 1px solid #213062;
  border-radius: 12px;
}

.ctl label {
  display: block;
  margin-bottom: 6px;
}

input[type="range"] {
  width: 100%;
}

input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  background: #0b153a;
  color: var(--text);
  border: 1px solid #25366e;
  border-radius: 10px;
  font-size: var(--fs-input);
}

.btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

button {
  appearance: none;
  border: 1px solid #2e417e;
  color: var(--text);
  background: #0d1842;
  padding: 9px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--fs-btn);
  letter-spacing: 0.2px;
}

button:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(110, 168, 254, 0.15) inset;
}

button.primary {
  background: linear-gradient(180deg, #1742a0, #12367f);
  border-color: #3f6ad8;
}

button.danger {
  background: #330e19;
  border-color: #7e2e47;
}

/* ===== Status ===== */
.status {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #0c1537;
  border: 1px solid #2a3a73;
  font-size: var(--fs-status);
}

.status .kv {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
}

.pill {
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 11px;
}

.pill.good {
  background: rgba(61, 220, 151, 0.15);
  color: var(--good);
  border: 1px solid rgba(61, 220, 151, 0.35);
}

.pill.warn {
  background: rgba(255, 209, 102, 0.12);
  color: var(--warn);
  border: 1px solid rgba(255, 209, 102, 0.35);
}

.pill.bad {
  background: rgba(239, 71, 111, 0.12);
  color: var(--bad);
  border: 1px solid rgba(239, 71, 111, 0.35);
}

/* ===== Legend (κάτω αριστερά) ===== */
.legend {
  display: flex;
  gap: 10px;
  font-size: var(--fs-legend);
  color: var(--muted);
  margin-top: 8px;
  flex-wrap: wrap;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
  vertical-align: -1px;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

/* ΖΗΤΟΥΜΕΝΟ: M/m σε γκρι */
.c-m {
  background: var(--body-M);
}

.c-mov {
  background: var(--body-m);
}

.c-path {
  background: #6ea8fe;
}

.c-grid {
  background: #43507a;
}

/* ===== Canvas ===== */
canvas {
  width: 100%;
  height: calc(100vh - 120px);
  background: radial-gradient(
      800px 800px at 80% 20%,
      rgba(110, 168, 254, 0.09),
      transparent 40%
    ),
    radial-gradient(
      1000px 800px at 20% 60%,
      rgba(61, 220, 151, 0.07),
      transparent 42%
    ),
    #070b18;
  border: 1px solid #1b2549;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(4, 8, 20, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.unit-sup {
  font-size: 0.75em;
  vertical-align: super;
  opacity: 0.8;
  margin-left: 2px;
}

.chart-container canvas {
  border-radius: 8px;
}

/* ===== Collapsible chart headers ===== */
.chart-accordion {
  border: none;
  padding: 0;
}

.chart-accordion > summary {
  list-style: none;
  cursor: pointer;
}

.chart-accordion > summary::-webkit-details-marker {
  display: none;
}

details.chart-accordion {
  margin-bottom: 10px;
  border-radius: 10px;
}

details.chart-accordion summary::-webkit-details-marker {
  display: none;
}

details.chart-accordion summary {
  list-style: none;
}

details.chart-accordion > summary.chart-title {
  display: flex;
  align-items: center;
  position: relative;
  padding: 8px 12px 8px 28px;
  cursor: pointer;
  user-select: none;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.7);
  border-radius: 10px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

details.chart-accordion[open] > summary.chart-title {
  background: rgba(37, 99, 235, 0.85);
  border-color: #60a5fa;
}

details.chart-accordion > summary.chart-title::before {
  content: "▶";
  position: absolute;
  left: 10px;
  font-size: 0.8em;
  opacity: 0.9;
}

details.chart-accordion[open] > summary.chart-title::before {
  content: "▼";
}

details.chart-accordion .chart-container {
  margin-top: 8px;
}

.orbit-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.time-label {
  font-size: 0.85rem;
  color: var(--muted-text, #a3b5e6);
}

/* μικρό διακριτικό κουμπί PNG, πάνω δεξιά */
.chart-download-btn {
  position: absolute;
  right: 6px;
  top: 6px;
  padding: 2px 6px;
  font-size: 0.7rem;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(0, 0, 0, 0.4);
  color: #e0e0e0;
  cursor: pointer;
}

.chart-download-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ===== uPlot / ECharts text colors ===== */
.uplot,
.uplot .u-axis,
.uplot .u-axis .u-values,
.uplot .u-axis .u-value,
.uplot .u-axis .u-label,
.uplot .u-legend {
  color: #d0d0d0 !important;
}

.uplot .u-grid {
  stroke: rgba(255, 255, 255, 0.18);
}

.uplot text {
  fill: #d0d0d0 !important;
}

/* FIX: η .chart-container είχε διπλά/αντικρουόμενα */
.chart-container {
  position: relative;
  width: 100%;
  height: 220px;
  margin-bottom: 0.9rem;
}