/* =========================================================
   PULSELINE — Core Stylesheet
   Design language: "Instrument Panel" — deep-space ink base,
   layered aurora glass, mono data readouts, cyan/violet/teal.
   ========================================================= */

:root{
  /* --- Palette --- */
  --ink-950:#070a12;
  --ink-900:#0a0e17;
  --ink-850:#0e1420;
  --ink-800:#131a29;
  --ink-700:#1b2437;
  --ink-600:#293451;

  --fog-100:#f4f6fb;
  --fog-200:#dfe4ef;
  --fog-400:#a7b0c4;
  --fog-600:#7b8499;

  --accent-blue:#7c9cff;
  --accent-teal:#4ce0d2;
  --accent-violet:#c97bff;
  --accent-amber:#ffb454;
  --accent-red:#ff6b7a;
  --accent-green:#5be8a4;

  --grad-signal: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  --grad-aurora-1: radial-gradient(circle, rgba(124,156,255,.55), transparent 65%);
  --grad-aurora-2: radial-gradient(circle, rgba(76,224,210,.45), transparent 65%);
  --grad-aurora-3: radial-gradient(circle, rgba(201,123,255,.4), transparent 65%);

  /* --- Type --- */
  --font-display:'Space Grotesk', 'Segoe UI', sans-serif;
  --font-mono:'JetBrains Mono', ui-monospace, monospace;

  /* --- Elevation / glass --- */
  --glass-bg: rgba(19,26,41,.55);
  --glass-bg-soft: rgba(19,26,41,.35);
  --glass-border: rgba(255,255,255,.09);
  --glass-blur: 18px;
  --shadow-soft: 0 20px 60px -20px rgba(0,0,0,.6);
  --shadow-glow-blue: 0 0 40px -8px rgba(124,156,255,.55);
  --shadow-glow-teal: 0 0 40px -8px rgba(76,224,210,.5);

  /* --- Motion --- */
  --dur-fast:.18s;
  --dur-med:.4s;
  --dur-slow:.9s;
  --ease-out: cubic-bezier(.16,1,.3,1);
  --anim-scale: 1; /* toggled by settings: 0, 1, 1.6 */

  /* --- Radii --- */
  --r-lg:24px;
  --r-md:16px;
  --r-sm:10px;

  color-scheme: dark;
  --text-primary: var(--fog-100);
  --text-secondary: var(--fog-400);
  --page-bg: var(--ink-900);
}

:root[data-theme="light"]{
  color-scheme: light;
  --page-bg:#eef1f8;
  --text-primary:#141a26;
  --text-secondary:#4c566e;
  --glass-bg: rgba(255,255,255,.62);
  --glass-bg-soft: rgba(255,255,255,.4);
  --glass-border: rgba(20,26,38,.08);
  --shadow-soft: 0 20px 50px -25px rgba(20,26,38,.35);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-display);
  background:var(--page-bg);
  color:var(--text-primary);
  min-height:100vh;
  overflow-x:hidden;
  transition: background var(--dur-med) var(--ease-out), color var(--dur-med) var(--ease-out);
}

h1,h2,h3{ font-family:var(--font-display); margin:0; letter-spacing:-.01em; }
p{ margin:0; }
button{ font-family:inherit; }
select, input{ font-family:inherit; }

.sr-only{
  position:absolute; width:1px;height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
.skip-link{
  position:absolute; left:12px; top:-60px; z-index:999;
  background:var(--ink-800); color:var(--fog-100); padding:10px 16px;
  border-radius:var(--r-sm); transition: top var(--dur-fast);
}
.skip-link:focus{ top:12px; }

:focus-visible{
  outline: 2px solid var(--accent-teal);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ===================== Ambient background ===================== */
.bg-layer{
  position:fixed; inset:0; z-index:-1; overflow:hidden;
  background: radial-gradient(ellipse at top, var(--ink-850), var(--ink-950) 70%);
}
:root[data-theme="light"] .bg-layer{
  background: radial-gradient(ellipse at top, #f7f9fd, #e6ebf5 70%);
}
.aurora{
  position:absolute; width:70vw; height:70vw; max-width:900px; max-height:900px;
  border-radius:50%; filter: blur(70px); opacity:.55;
  animation: aurora-drift calc(26s / var(--anim-scale)) ease-in-out infinite alternate;
  will-change: transform;
}
.aurora-1{ background:var(--grad-aurora-1); top:-15%; left:-10%; }
.aurora-2{ background:var(--grad-aurora-2); bottom:-20%; right:-10%; animation-duration: calc(32s / var(--anim-scale)); }
.aurora-3{ background:var(--grad-aurora-3); top:35%; left:35%; animation-duration: calc(40s / var(--anim-scale)); opacity:.35; }

@keyframes aurora-drift{
  0%{ transform: translate(0,0) scale(1); }
  50%{ transform: translate(6%, 4%) scale(1.12); }
  100%{ transform: translate(-4%, 8%) scale(.96); }
}

.grid-overlay{
  position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(124,156,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124,156,255,.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse at 50% 20%, black, transparent 75%);
}

#particles-canvas{ position:absolute; inset:0; width:100%; height:100%; opacity:.6; }

.floating-shape{
  position:absolute; border-radius:38% 62% 55% 45% / 45% 40% 60% 55%;
  border:1px solid rgba(255,255,255,.08);
  background:linear-gradient(135deg, rgba(124,156,255,.06), rgba(76,224,210,.03));
  backdrop-filter: blur(2px);
  animation: shape-float calc(18s / var(--anim-scale)) ease-in-out infinite;
}
.shape-1{ width:180px; height:180px; top:12%; right:8%; animation-delay:0s; }
.shape-2{ width:110px; height:110px; bottom:18%; left:6%; animation-delay:-4s; animation-duration: calc(22s / var(--anim-scale)); }
.shape-3{ width:70px; height:70px; top:60%; right:22%; animation-delay:-9s; }
.shape-4{ width:140px; height:140px; top:4%; left:38%; animation-delay:-13s; animation-duration: calc(26s / var(--anim-scale)); }

@keyframes shape-float{
  0%,100%{ transform: translateY(0) rotate(0deg); }
  50%{ transform: translateY(-26px) rotate(12deg); }
}

/* ===================== Glass primitive ===================== */
.glass{
  background:var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  border:1px solid var(--glass-border);
  box-shadow: var(--shadow-soft);
  border-radius: var(--r-lg);
}

/* ===================== Topbar ===================== */
.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  margin:16px; padding:12px 20px;
  border-radius: 999px;
}
.brand{ display:flex; align-items:center; gap:10px; }
.brand-name{ font-weight:700; font-size:1.15rem; letter-spacing:-.02em; }

.topbar-nav{ display:flex; gap:4px; background:var(--glass-bg-soft); padding:4px; border-radius:999px; border:1px solid var(--glass-border); }
.nav-btn{
  border:0; background:transparent; color:var(--text-secondary);
  padding:8px 18px; border-radius:999px; cursor:pointer; font-weight:600; font-size:.9rem;
  transition: all var(--dur-fast) var(--ease-out);
}
.nav-btn:hover{ color:var(--text-primary); }
.nav-btn.is-active{ background:var(--grad-signal); color:#06121a; box-shadow: var(--shadow-glow-blue); }

.icon-btn{
  width:38px; height:38px; border-radius:50%; border:1px solid var(--glass-border);
  background:var(--glass-bg-soft); color:var(--text-primary); cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast);
}
.icon-btn:hover{ transform: rotate(20deg) scale(1.06); box-shadow: var(--shadow-glow-teal); }

/* ===================== Layout / views ===================== */
main{ max-width:1320px; margin:0 auto; padding: 20px 24px 80px; }
.view{ display:none; animation: view-in var(--dur-slow) var(--ease-out); }
.view.is-active{ display:block; }
@keyframes view-in{ from{ opacity:0; transform:translateY(14px);} to{opacity:1; transform:translateY(0);} }

.hero-copy{ max-width:720px; margin: 28px 0 32px; }
.eyebrow{
  font-family:var(--font-mono); text-transform:uppercase; letter-spacing:.18em;
  font-size:.72rem; color:var(--accent-teal); margin-bottom:10px; display:block;
}
.hero-copy h1{ font-size: clamp(1.8rem, 3.6vw, 2.8rem); line-height:1.1; margin-bottom:12px; }
.hero-sub{ color:var(--text-secondary); font-size:1.02rem; line-height:1.6; }

.dashboard-grid{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  grid-template-areas:
    "gauge result"
    "chart info";
  gap:20px;
}
.gauge-panel{ grid-area:gauge; }
.result-panel{ grid-area:result; }
.chart-panel{ grid-area:chart; }
.info-panel{ grid-area:info; }

.panel{ padding:26px; }
.panel-title{ font-size:1.05rem; font-weight:700; margin-bottom:16px; }
.panel-header{ display:flex; align-items:center; justify-content:space-between; margin-bottom:16px; }

/* ===================== Gauge panel ===================== */
.gauge-panel{ display:flex; flex-direction:column; align-items:center; text-align:center; }
.gauge-wrap{ position:relative; width:100%; max-width:340px; aspect-ratio:1/1; margin:4px auto 8px; }
#gauge-canvas{ width:100%; height:100%; }
.gauge-readout{
  position:absolute; inset:0; display:flex; flex-direction:column;
  align-items:center; justify-content:center; pointer-events:none;
}
.gauge-value{
  font-family:var(--font-mono); font-weight:700; font-size:clamp(2.4rem,7vw,3.4rem);
  line-height:1; background:var(--grad-signal); -webkit-background-clip:text; background-clip:text; color:transparent;
  text-shadow: 0 0 30px rgba(76,224,210,.25);
}
.gauge-unit{ font-family:var(--font-mono); font-size:.85rem; color:var(--text-secondary); letter-spacing:.08em; margin-top:2px; }
.gauge-phase{
  margin-top:10px; font-family:var(--font-mono); font-size:.72rem; text-transform:uppercase;
  letter-spacing:.16em; color:var(--accent-blue); padding:4px 12px; border:1px solid var(--glass-border);
  border-radius:999px; background:var(--glass-bg-soft);
}

.gauge-controls{ display:flex; flex-direction:column; align-items:center; gap:14px; margin-top:14px; }
.btn-start{
  position:relative; border:0; cursor:pointer; width:120px; height:120px; border-radius:50%;
  background: var(--grad-signal); color:#06121a; font-weight:700; font-size:.95rem;
  box-shadow: var(--shadow-glow-blue); transition: transform var(--dur-fast) var(--ease-out);
}
.btn-start:hover{ transform: scale(1.045); }
.btn-start:active{ transform: scale(.97); }
.btn-start-ring{
  position:absolute; inset:-8px; border-radius:50%; border:1.5px solid rgba(124,156,255,.5);
  animation: ring-pulse calc(2.4s / var(--anim-scale)) ease-in-out infinite;
}
@keyframes ring-pulse{
  0%,100%{ transform:scale(1); opacity:.6; }
  50%{ transform:scale(1.12); opacity:0; }
}
.btn-start.is-running .btn-start-label::after{ content:"Stop"; }
.btn-start.is-running{ background: linear-gradient(135deg, var(--accent-red), var(--accent-amber)); }

.server-pill{
  display:flex; align-items:center; gap:8px; font-family:var(--font-mono); font-size:.78rem;
  color:var(--text-secondary); padding:6px 14px; border-radius:999px; background:var(--glass-bg-soft);
  border:1px solid var(--glass-border);
}
.dot{ width:7px; height:7px; border-radius:50%; background:var(--accent-teal); }
.dot-live{ box-shadow:0 0 0 0 rgba(76,224,210,.6); animation: dot-ping calc(1.8s / var(--anim-scale)) infinite; }
@keyframes dot-ping{
  0%{ box-shadow:0 0 0 0 rgba(76,224,210,.55); }
  70%{ box-shadow:0 0 0 8px rgba(76,224,210,0); }
  100%{ box-shadow:0 0 0 0 rgba(76,224,210,0); }
}

.gauge-stats{ display:flex; gap:10px; width:100%; margin-top:20px; }
.stat{ flex:1; background:var(--glass-bg-soft); border:1px solid var(--glass-border); border-radius:var(--r-md); padding:12px; }
.stat-label{ display:block; font-size:.7rem; color:var(--text-secondary); text-transform:uppercase; letter-spacing:.1em; margin-bottom:6px; }
.stat-value{ font-family:var(--font-mono); font-weight:700; font-size:1.25rem; }

/* ===================== Result cards ===================== */
.result-cards{ display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.result-card{
  display:flex; align-items:center; gap:12px; padding:14px; border-radius:var(--r-md);
  background:var(--glass-bg-soft); border:1px solid var(--glass-border);
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast);
}
.result-card:hover{ transform: translateY(-3px); box-shadow: var(--shadow-glow-blue); }
.result-icon{
  width:38px; height:38px; border-radius:12px; display:flex; align-items:center; justify-content:center;
  background: var(--grad-signal); color:#06121a; font-weight:700; flex-shrink:0;
}
.result-label{ display:block; font-size:.72rem; color:var(--text-secondary); text-transform:uppercase; letter-spacing:.08em; }
.result-figure{ font-family:var(--font-mono); font-weight:700; font-size:1.15rem; }
.result-figure small{ font-size:.65em; color:var(--text-secondary); font-weight:500; }

.unit-toggle{ display:flex; gap:6px; margin-top:18px; }
.unit-btn{
  flex:1; padding:8px; border-radius:var(--r-sm); border:1px solid var(--glass-border);
  background:transparent; color:var(--text-secondary); cursor:pointer; font-size:.78rem; font-weight:600;
  transition: all var(--dur-fast);
}
.unit-btn.is-active{ background:var(--grad-signal); color:#06121a; border-color:transparent; }

/* ===================== Charts ===================== */
.legend{ display:flex; gap:14px; font-size:.78rem; color:var(--text-secondary); }
.legend-item{ display:flex; align-items:center; gap:6px; }
.swatch{ width:10px; height:10px; border-radius:3px; display:inline-block; }
.swatch-down{ background:var(--accent-teal); }
.swatch-up{ background:var(--accent-violet); }
canvas#live-chart, canvas#history-chart{ width:100%; display:block; }

/* ===================== Info panel ===================== */
.info-list{ margin:0; display:grid; gap:0; }
.info-row{ display:flex; align-items:center; justify-content:space-between; padding:10px 0; border-bottom:1px dashed var(--glass-border); }
.info-row:last-child{ border-bottom:0; }
.info-row dt{ color:var(--text-secondary); font-size:.85rem; }
.info-row dd{ margin:0; font-family:var(--font-mono); font-size:.85rem; font-weight:600; text-align:right; }

/* ===================== History view ===================== */
.export-actions{ display:flex; gap:8px; flex-wrap:wrap; }
.btn-ghost{
  padding:8px 14px; border-radius:999px; border:1px solid var(--glass-border);
  background:var(--glass-bg-soft); color:var(--text-primary); cursor:pointer; font-size:.8rem; font-weight:600;
  transition: all var(--dur-fast);
}
.btn-ghost:hover{ box-shadow: var(--shadow-glow-teal); transform:translateY(-1px); }
.btn-danger{ color:var(--accent-red); }

.table-wrap{ overflow-x:auto; }
.history-table{ width:100%; border-collapse:collapse; font-size:.85rem; }
.history-table th{
  text-align:left; padding:10px 14px; color:var(--text-secondary); font-weight:600;
  text-transform:uppercase; font-size:.7rem; letter-spacing:.08em; border-bottom:1px solid var(--glass-border);
}
.history-table td{ padding:12px 14px; font-family:var(--font-mono); border-bottom:1px solid var(--glass-border); }
.history-table tbody tr{ transition: background var(--dur-fast); }
.history-table tbody tr:hover{ background: var(--glass-bg-soft); }
.empty-row td{ text-align:center; color:var(--text-secondary); font-family:var(--font-display); padding:30px; }

/* ===================== Settings ===================== */
.settings-panel{ display:flex; flex-direction:column; gap:22px; }
.settings-row{ display:grid; grid-template-columns: 1fr 1fr; gap:20px; align-items:center; padding-bottom:20px; border-bottom:1px dashed var(--glass-border); }
.settings-row:last-child{ border-bottom:0; padding-bottom:0; }
.settings-label span{ display:block; font-weight:600; margin-bottom:4px; }
.settings-label small{ color:var(--text-secondary); font-size:.8rem; }
.select{
  width:100%; padding:10px 14px; border-radius:var(--r-sm); border:1px solid var(--glass-border);
  background:var(--glass-bg-soft); color:var(--text-primary); font-size:.88rem; cursor:pointer;
}
.range{ width:100%; accent-color: var(--accent-teal); }
.range-labels{ display:flex; justify-content:space-between; font-size:.7rem; color:var(--text-secondary); margin-top:4px; }
.segmented{ display:flex; border:1px solid var(--glass-border); border-radius:999px; overflow:hidden; }
.segmented button{
  flex:1; padding:9px; background:transparent; border:0; color:var(--text-secondary); cursor:pointer; font-size:.82rem; font-weight:600;
}
.segmented button[aria-checked="true"]{ background:var(--grad-signal); color:#06121a; }

.site-footer{ text-align:center; padding:30px; color:var(--text-secondary); font-size:.78rem; }