@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;700;800&family=Space+Grotesk:wght@400;500;600&display=swap');

:root {
  --bg: #101419;
  --surface: rgba(28,32,37,0.6);
  --surface-low: #181c21;
  --primary: #5eead4;
  --primary-glow: rgba(94,234,212,0.15);
  --primary-dim: rgba(94,234,212,0.08);
  --text: #e0e2ea;
  --text-dim: #8a9098;
  --ghost: rgba(94,234,212,0.1);
  --accent: #449364; /* overridden per rhythm */
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: 'Manrope', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Atmospheric radial gradients */
body::before, body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
body::before { background: radial-gradient(circle at 50% -20%, #1a2a2f, transparent 60%); }
body::after  { background: radial-gradient(circle at bottom right, #001e1c, transparent 40%); }

/* ── Glass Panel ──────────────────── */
.glass {
  background: var(--surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--ghost);
  box-shadow: inset 0 1px 1px rgba(224,226,234,0.08);
}

/* ── Header ───────────────────────── */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(16,20,25,0.8);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border-bottom: 1px solid rgba(94,234,212,0.12);
  box-shadow: 0 1px 10px rgba(94,234,212,0.08);
}

.logo {
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  color: var(--primary);
}

.tabs {
  display: flex;
  align-items: center;
  gap: 32px;
}
.tab {
  font-family: 'Manrope', sans-serif;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  text-decoration: none;
  color: #64748b;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: all 0.3s;
}
.tab:hover { color: #cbd5e1; }
.tab.on {
  color: var(--primary);
  border-bottom-color: var(--primary);
  text-shadow: 0 0 12px rgba(94,234,212,0.4);
}

/* ── Layout ───────────────────────── */
.layout {
  position: relative;
  z-index: 1;
  padding-top: 64px;
  display: flex;
  height: 100vh;
}

/* ── Sidebar ──────────────────────── */
.sidebar {
  position: fixed;
  left: 0;
  top: 64px;
  height: calc(100vh - 64px);
  width: 280px;
  background: rgba(16,20,25,0.4);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border-right: 1px solid rgba(94,234,212,0.08);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  z-index: 40;
  overflow-y: auto;
}

.sidebar-title {
  color: var(--primary);
  font-weight: 700;
  font-size: 1rem;
}
.sidebar-label {
  font-family: 'Space Grotesk', monospace;
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-dim);
}

/* Parameter card */
.param-card {
  border-radius: 12px;
  padding: 20px;
}
/* Every parameter carries equal weight, so they all get the same surface.
   The first row used to be tinted with an accent left-border, which read as
   "focus on this one" without meaning anything. */
.param-item {
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255,255,255,0.03);
}
/* param items are display-only, no hover */
.param-label {
  font-family: 'Space Grotesk', monospace;
  font-size: 0.65rem;
  color: var(--text-dim);
}
.param-value {
  font-family: 'Space Grotesk', monospace;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.02em;
}
.param-unit {
  font-size: 0.55rem;
  opacity: 0.6;
  margin-left: 2px;
}

/* ── Main ─────────────────────────── */
.main {
  margin-left: 280px;
  flex: 1;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

/* Bento top row */
.bento-top {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 20px;
  min-height: 300px;
}

/* Heart box */
.heart-box {
  border-radius: 16px;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.heart-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(94,234,212,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.heart-box svg { width: 100%; height: 100%; position: relative; z-index: 1; }
.heart-path {
  fill: none;
  stroke: var(--primary);
  stroke-width: 1.5;
  opacity: 0.5;
  filter: drop-shadow(0 0 4px rgba(94,234,212,0.3));
}
.sep-line {
  stroke: rgba(94,234,212,0.12);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

/* Mode toggle + info column */
.info-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.toggle {
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toggle-label {
  font-family: 'Space Grotesk', monospace;
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.toggle-btns { display: flex; gap: 6px; }
.tbtn {
  flex: 1;
  padding: 8px 12px;
  border: none;
  border-radius: 8px;
  font-family: 'Space Grotesk', monospace;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  transition: all 0.2s;
}
.tbtn:hover { color: var(--text); background: rgba(255,255,255,0.08); }
.tbtn.on {
  color: #002e28;
  background: var(--primary);
  box-shadow: 0 0 15px rgba(94,234,212,0.3);
}

.insight-card {
  flex: 1;
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.insight-card h4 {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
}
.insight-card p {
  font-size: 0.72rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.insight-card p strong { color: var(--text); font-weight: 500; }

/* ── ECG Strip ────────────────────── */
.strip-panel {
  border-radius: 16px;
  flex: 1;
  min-height: 280px;
  display: flex;
  flex-direction: column;
}

.strip-header {
  padding: 14px 20px;
  border-bottom: 1px solid rgba(94,234,212,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.strip-title {
  font-size: 0.78rem;
  font-weight: 700;
}
.strip-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  background: rgba(28,32,37,0.8);
  border-radius: 6px;
}
.strip-meta span {
  font-family: 'Space Grotesk', monospace;
  font-size: 0.58rem;
  color: var(--text-dim);
}

.strip-canvas {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: crosshair;
  /* ECG grid */
  background-image:
    linear-gradient(to right, rgba(94,234,212,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(94,234,212,0.04) 1px, transparent 1px);
  background-size: 20px 20px;
}
.strip-canvas::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(94,234,212,0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(94,234,212,0.02) 1px, transparent 1px);
  background-size: 4px 4px;
  pointer-events: none;
}
.strip-canvas svg {
  width: 100%;
  height: 100%;
  display: block;
  position: relative;
  z-index: 1;
}

/* SVG drawing styles */
.ref-wave { fill:none; stroke: var(--primary); stroke-width: 2.5; opacity: 0.18; }
.drawn { fill:none; stroke: var(--primary); stroke-width: 2.5; stroke-linecap:round; stroke-linejoin:round; opacity:0.9; filter: drop-shadow(0 0 6px rgba(94,234,212,0.5)); }
.answer { fill:none; stroke: #b5fff0; stroke-width: 2.5; stroke-linecap:round; opacity:0; transition: opacity 0.6s ease; filter: drop-shadow(0 0 8px rgba(181,255,240,0.6)); }
.answer.show { opacity: 1; }
.start-dot { cursor:pointer; filter: drop-shadow(0 0 8px rgba(94,234,212,0.6)); transition: r 0.15s ease; }
.start-dot:hover { r: 13; }
.grid-line { stroke: rgba(94,234,212,0.03); stroke-width: 0.5; }
.grid-bold { stroke: rgba(94,234,212,0.06); stroke-width: 0.5; }

/* Strip footer */
.strip-footer {
  padding: 16px 20px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  background: rgba(24,28,33,0.4);
  border-radius: 0 0 16px 16px;
}

.btn-reset {
  padding: 10px 28px;
  border-radius: 8px;
  border: none;
  background: none;
  font-family: 'Space Grotesk', monospace;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.2s;
}
.btn-reset:hover { color: var(--text); }

.btn-check {
  padding: 12px 36px;
  border-radius: 8px;
  border: none;
  background: var(--primary);
  font-family: 'Space Grotesk', monospace;
  font-size: 0.65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #002e28;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(94,234,212,0.4);
  transition: all 0.2s;
}
.btn-check:hover {
  transform: scale(1.04);
  box-shadow: 0 0 30px rgba(94,234,212,0.5);
}
.btn-check:active { transform: scale(0.97); }

/* ── Responsive ───────────────────── */
@media (max-width: 1100px) {
  .bento-top { grid-template-columns: 1fr; }
  .info-col { flex-direction: row; }
}
@media (max-width: 900px) {
  .sidebar { display: none; }
  .main { margin-left: 0; }
  .tabs { gap: 16px; }
  .tab { font-size: 0.6rem; }
}