/* ===== Ragnar — RuSense CSI Node Flasher · matches Ragnar web palette ===== */
/* Brand color is Tailwind sky-500 / sky-400 / sky-600 (see tailwind.config.js
   in the main repo); background mirrors the slate-900→slate-800 gradient used
   by index_modern.html. Glass cards mirror the .glass utility (rgba slate-900
   with backdrop-blur). The Viking trim (boar logo, "Forge" copy, rune strip)
   is recoloured in Ragnar blue rather than gold. */
:root {
  color-scheme: dark;
  --bg:          #0f172a;   /* slate-900 */
  --bg-dark:     #020617;   /* slate-950 */
  --surface:     rgba(15, 23, 42, 0.7);    /* matches .glass on Ragnar web */
  --surface-solid: #1e293b; /* slate-800 — for solid panels */
  --border:      rgba(255, 255, 255, 0.10);
  --border-accent: rgba(56, 189, 248, 0.30);
  --accent:      #0ea5e9;   /* sky-500 — Ragnar primary */
  --accent-light:#38bdf8;   /* sky-400 */
  --accent-dim:  #0284c7;   /* sky-600 */
  --accent-glow: rgba(14, 165, 233, 0.25);
  --green:       #22c55e;   /* green-500 */
  --green-dim:   #16a34a;
  --purple:      #a855f7;
  --yellow:      #eab308;
  --red:         #ef4444;
  --white:       #f8fafc;   /* slate-50 */
  --grey:        #94a3b8;   /* slate-400 */
  --grey-dim:    #1e293b;   /* slate-800 */
}

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

body {
  min-height: 100vh;
  /* Same gradient as Ragnar's index_modern.html body */
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  color: var(--white);
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 300;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

/* Subtle accent glow at top, fades to nothing */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at center top,
      rgba(14, 165, 233, 0.08) 0%,
      transparent 55%);
  pointer-events: none;
  z-index: 1;
}

/* Top rune strip — thin band of futhark across the top, in Ragnar blue */
.rune-strip {
  position: relative;
  z-index: 3;
  width: 100%;
  text-align: center;
  font-family: "Russo One", system-ui, sans-serif;
  letter-spacing: 0.35em;
  color: var(--accent-dim);
  font-size: 0.75rem;
  padding: 0.45rem 0;
  background: linear-gradient(180deg,
    rgba(14, 165, 233, 0.10) 0%,
    transparent 100%);
  border-bottom: 1px solid var(--border);
  user-select: none;
}

/* ── layout ── */
.page {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* ── header ── */
.site-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem 0 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
}
.site-header .logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background:
    radial-gradient(circle at 30% 30%,
      rgba(125, 211, 252, 0.45) 0%,
      transparent 60%),
    linear-gradient(135deg, var(--accent-light) 0%, var(--accent-dim) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
  box-shadow: 0 0 18px var(--accent-glow),
              inset 0 0 6px rgba(0,0,0,0.3);
  border: 1px solid rgba(0, 0, 0, 0.25);
}
.site-header .brand {
  font-family: "Russo One", system-ui, sans-serif;
  font-size: 1.2rem;
  /* Match Ragnar's gradient brand text (from-Ragnar-400 to-Ragnar-600) */
  background: linear-gradient(90deg, var(--accent-light), var(--accent-dim));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.site-header .brand span {
  color: var(--accent-light);
  -webkit-text-fill-color: var(--accent-light);
}

/* ── hero title ── */
.hero-title {
  text-align: center;
  margin-bottom: 2.5rem;
}
.hero-title .rune-divider {
  font-family: "Russo One", system-ui, sans-serif;
  color: var(--accent-dim);
  letter-spacing: 0.4em;
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
  user-select: none;
}
.hero-title h1 {
  font-family: "Russo One", system-ui, sans-serif;
  font-weight: 400;
  font-size: clamp(1.8rem, 6vw, 2.8rem);
  margin: 0 0 0.4rem;
  color: var(--white);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-shadow: 0 0 24px rgba(14, 165, 233, 0.25);
}
.hero-title h1 span { color: var(--accent-light); }
.hero-title .tagline {
  font-size: 0.9rem;
  color: var(--accent-light);
  margin: 0 0 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}
.hero-title .desc {
  font-size: 0.95rem;
  color: rgba(248, 250, 252, 0.7);
  max-width: 540px;
  margin: 0 auto;
}

/* ── flash panel (glass card, matches Ragnar's .glass) ── */
.flash-panel {
  background: var(--surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow:
    0 4px 24px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.flash-panel h2 {
  margin: 0 0 0.6rem;
  font-size: 1.2rem;
  color: var(--accent-light);
  font-weight: 500;
  font-family: "Russo One", system-ui, sans-serif;
  letter-spacing: 0.03em;
}
.flash-panel h2 .panel-sub {
  display: inline;
  font-family: "Inter", system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--grey);
  letter-spacing: 0.04em;
  margin-left: 0.4rem;
  text-transform: none;
}
.flash-panel p {
  margin: 0 0 1rem;
  font-size: 0.92rem;
  color: rgba(248, 250, 252, 0.78);
}

/* ── prerequisites ── */
.prereq {
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.25);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  margin-bottom: 1.25rem;
}
.prereq-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-light);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.prereq ol {
  margin: 0;
  padding-left: 1.4rem;
  font-size: 0.88rem;
  color: rgba(248, 250, 252, 0.85);
}
.prereq ol li { margin-bottom: 0.25rem; }
.prereq ol li:last-child { margin-bottom: 0; }
.prereq code {
  background: rgba(14, 165, 233, 0.15);
  border-radius: 3px;
  padding: 0 4px;
  font-size: 0.82rem;
  color: var(--green);
}

/* ── chip badge ── */
.chip-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.chip-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(34, 197, 94, 0.10);
  border: 1px solid rgba(34, 197, 94, 0.30);
  border-radius: 20px;
  padding: 0.2rem 0.75rem;
  font-size: 0.8rem;
  color: var(--green);
  font-weight: 500;
}
.chip-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse 2s ease-in-out infinite;
  box-shadow: 0 0 6px var(--green);
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ── buttons ── */
.flash-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.btn-flash {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  color: #fff;
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  padding: 0.7rem 1.4rem;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: filter 0.15s, box-shadow 0.15s, transform 0.1s;
  box-shadow:
    0 2px 12px var(--accent-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.20);
  font-family: "Russo One", system-ui, sans-serif;
}
.btn-flash:hover {
  filter: brightness(1.10);
  box-shadow:
    0 4px 22px var(--accent-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}
.btn-flash:active { transform: translateY(0); filter: brightness(1); }
.btn-flash.btn-small {
  padding: 0.45rem 0.95rem;
  font-size: 0.82rem;
  font-family: "Inter", system-ui, sans-serif;
  text-transform: none;
  letter-spacing: 0.02em;
}

.btn-logs {
  background: transparent;
  color: var(--accent-light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 1.2rem;
  font-size: 0.88rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.btn-logs:hover {
  color: var(--white);
  border-color: var(--accent);
  background: rgba(14, 165, 233, 0.08);
}
.btn-logs.btn-small { padding: 0.4rem 0.9rem; font-size: 0.82rem; }

.hint {
  margin-top: 0.75rem !important;
  font-size: 0.82rem !important;
  color: var(--grey) !important;
}

/* ── divider ── */
.divider {
  text-align: center;
  color: var(--grey);
  margin: 0.75rem 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

/* ── browser warning ── */
.browser-warn {
  display: none;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  font-size: 0.85rem;
  color: var(--red);
  margin-bottom: 1.5rem;
  text-align: center;
}

/* ── footer ── */
.footer {
  text-align: center;
  font-size: 0.82rem;
  color: var(--grey);
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  line-height: 2;
}
.footer a { color: var(--accent-light); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer code {
  background: var(--grey-dim);
  border-radius: 3px;
  padding: 0 4px;
  font-size: 0.75rem;
  color: var(--accent-light);
}
.footer .skal {
  font-family: "Russo One", system-ui, sans-serif;
  letter-spacing: 0.2em;
  color: var(--accent-light);
  margin-top: 0.4rem;
  font-size: 0.95rem;
}

/* ── overlay / dialog ── */
.flash-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}
.flash-overlay[hidden] { display: none; }

.flash-dialog {
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  width: 100%;
  max-width: 520px;
  box-shadow:
    0 16px 60px rgba(0,0,0,0.7),
    0 0 40px var(--accent-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.flash-dialog h3 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  color: var(--accent-light);
  font-family: "Russo One", system-ui, sans-serif;
  letter-spacing: 0.04em;
}

.flash-progress-track {
  background: var(--grey-dim);
  border-radius: 4px;
  height: 6px;
  margin-bottom: 0.5rem;
  overflow: hidden;
}
.flash-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dim) 0%, var(--accent) 50%, var(--green) 100%);
  border-radius: 4px;
  width: 0%;
  transition: width 0.3s ease;
  box-shadow: 0 0 10px var(--accent-glow);
}
.flash-pct {
  font-size: 0.82rem;
  color: var(--grey);
  margin: 0 0 0.4rem;
  text-align: right;
}
.flash-status {
  font-size: 0.9rem;
  color: var(--white);
  margin: 0 0 0.75rem;
}
.flash-log {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem;
  font-size: 0.75rem;
  color: var(--green);
  font-family: "Fira Code", "Courier New", monospace;
  height: 160px;
  overflow-y: auto;
  white-space: pre-wrap;
  margin-bottom: 1rem;
}

.flash-confirm-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

/* ── serial dialog extras ── */
.serial-dialog { max-width: 620px; }
.serial-baud {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: var(--grey);
}
.serial-baud select {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--white);
  padding: 0.2rem 0.5rem;
  font-size: 0.82rem;
}
.serial-log-area {
  height: 260px;
  color: var(--green);
}
.serial-input-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.serial-input-row input {
  flex: 1;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--white);
  padding: 0.45rem 0.75rem;
  font-size: 0.85rem;
  outline: none;
}
.serial-input-row input:focus { border-color: var(--accent); }
.serial-actions { display: flex; gap: 0.5rem; }