/* ============================================================================
   Quick Stuff — shared design system (dark "border-beam" edition)
   ----------------------------------------------------------------------------
   One stylesheet of design tokens + `qs-` component classes, linked by every
   app. Direction: a sleek dark canvas with glowing accents and an animated
   border beam — the same language as the landing page. Dense and utilitarian
   underneath, but alive.

   The signature: each tool picks ONE accent (via
   `data-accent="coral|mint|gold|violet|sky|rose"` on a wrapper) which threads
   through the header glow line, primary buttons, focus rings, active states,
   and the border beam that traces primary buttons (and any `.qs-beam` element)
   on hover.

   Fonts are loaded by the host page:
     Archivo Black, DM Sans (400/500/600), JetBrains Mono (500/700)
   ========================================================================== */

/* ---- Tokens (dark) ------------------------------------------------------- */
:root {
  /* Canvas + ink */
  --qs-bg: #0a0a0f;          /* page */
  --qs-panel: #15151d;       /* cards / raised surfaces */
  --qs-panel-2: #1b1b25;     /* insets, track backgrounds */
  --qs-panel-3: #20202b;     /* hovered surfaces */
  --qs-ink: #f3f2f7;         /* primary text */
  --qs-ink-muted: #9c9cab;   /* secondary text */
  --qs-ink-faint: #6b6b78;   /* tertiary / placeholders */
  --qs-line: rgba(255,255,255,0.09);   /* hairline borders */
  --qs-line-strong: rgba(255,255,255,0.16); /* emphasized borders */

  /* Accent — default coral. Override the block via [data-accent="…"]. */
  --qs-accent: #ff6b5b;
  --qs-accent-strong: #ff5343;
  --qs-accent-ink: #ffffff;
  --qs-accent-soft: rgba(255, 107, 91, 0.16);
  --qs-accent-ring: rgba(255, 107, 91, 0.42);

  /* Type */
  --qs-font-display: "Archivo Black", -apple-system, sans-serif;
  --qs-font-ui: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --qs-font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --qs-text-xs: 0.75rem;     /* 12 */
  --qs-text-sm: 0.8125rem;   /* 13 */
  --qs-text-base: 0.875rem;  /* 14 — dense base */
  --qs-text-md: 1rem;        /* 16 */
  --qs-text-lg: 1.25rem;     /* 20 */
  --qs-text-xl: 1.625rem;    /* 26 */
  --qs-text-2xl: 2.25rem;    /* 36 */

  /* Spacing — 4px base, tight */
  --qs-1: 0.25rem;   /* 4  */
  --qs-2: 0.5rem;    /* 8  */
  --qs-3: 0.75rem;   /* 12 */
  --qs-4: 1rem;      /* 16 */
  --qs-5: 1.25rem;   /* 20 */
  --qs-6: 1.5rem;    /* 24 */
  --qs-8: 2rem;      /* 32 */

  /* Radius — moderate, not bulbous */
  --qs-radius-sm: 6px;
  --qs-radius: 8px;
  --qs-radius-lg: 12px;
  --qs-radius-full: 999px;

  /* Elevation — deep, quiet */
  --qs-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --qs-shadow: 0 10px 34px rgba(0, 0, 0, 0.5);

  --qs-border: 1px;
  --qs-transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --qs-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --qs-header-h: 3.25rem;
  --qs-maxw: 60rem;
}

/* Animated angle for the border beam (GPU-friendly via @property). */
@property --qs-ba { syntax: '<angle>'; inherits: false; initial-value: 0deg; }

/* ---- Accent palette ------------------------------------------------------ */
/* accent-ink is the text/icon color on solid accent fills — dark on the light
   accents (mint/gold/sky), white on the saturated ones (coral/violet/rose). */
[data-accent="coral"]  { --qs-accent:#ff6b5b; --qs-accent-strong:#ff5343; --qs-accent-ink:#fff;     --qs-accent-soft:rgba(255,107,91,0.16); --qs-accent-ring:rgba(255,107,91,0.42); }
[data-accent="mint"]   { --qs-accent:#3cd6cb; --qs-accent-strong:#2cc3b8; --qs-accent-ink:#04231f;  --qs-accent-soft:rgba(60,214,203,0.16);  --qs-accent-ring:rgba(60,214,203,0.42); }
[data-accent="gold"]   { --qs-accent:#f5c518; --qs-accent-strong:#ecbe0a; --qs-accent-ink:#2a2a2a;  --qs-accent-soft:rgba(245,197,24,0.16);  --qs-accent-ring:rgba(245,197,24,0.42); }
[data-accent="violet"] { --qs-accent:#a06bf0; --qs-accent-strong:#8f52e6; --qs-accent-ink:#fff;     --qs-accent-soft:rgba(160,107,240,0.18); --qs-accent-ring:rgba(160,107,240,0.42); }
[data-accent="sky"]    { --qs-accent:#25b8dd; --qs-accent-strong:#1aa6cb; --qs-accent-ink:#04252e;  --qs-accent-soft:rgba(37,184,221,0.16);  --qs-accent-ring:rgba(37,184,221,0.42); }
[data-accent="rose"]   { --qs-accent:#f15bb5; --qs-accent-strong:#e846a8; --qs-accent-ink:#fff;     --qs-accent-soft:rgba(241,91,181,0.16);  --qs-accent-ring:rgba(241,91,181,0.42); }

/* ---- Base ---------------------------------------------------------------- */
.qs-root,
.qs-root *,
.qs-root *::before,
.qs-root *::after { box-sizing: border-box; }

.qs-root {
  margin: 0;
  min-height: 100vh;
  background: var(--qs-bg);
  color: var(--qs-ink);
  font-family: var(--qs-font-ui);
  font-size: var(--qs-text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  position: relative;
}
/* Ambient top glow — the sleek halo behind the header/hero. */
.qs-root::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 60vh;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(40% 60% at 26% 0%, color-mix(in srgb, var(--qs-accent) 20%, transparent), transparent 70%),
    radial-gradient(34% 52% at 80% 4%, rgba(120,120,180,0.14), transparent 70%);
  filter: blur(6px);
}
.qs-root > * { position: relative; z-index: 1; }

/* ---- Layout -------------------------------------------------------------- */
.qs-main {
  flex: 1;
  width: 100%;
  max-width: var(--qs-maxw);
  margin-inline: auto;
  padding: var(--qs-6) var(--qs-4);
}
.qs-main--narrow { max-width: 34rem; }

/* Vertical rhythm helpers */
.qs-stack { display: flex; flex-direction: column; gap: var(--qs-4); }
.qs-stack--tight { gap: var(--qs-2); }
.qs-row { display: flex; align-items: center; gap: var(--qs-2); }
.qs-row--between { justify-content: space-between; }
.qs-cluster { display: flex; flex-wrap: wrap; gap: var(--qs-2); }
.qs-grow { flex: 1; }

/* ---- Header -------------------------------------------------------------- */
.qs-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--qs-3);
  height: var(--qs-header-h);
  padding-inline: var(--qs-4);
  background: color-mix(in srgb, var(--qs-bg) 72%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: var(--qs-border) solid var(--qs-line);
}
/* The one confident accent line — now a glowing beam of accent light. */
.qs-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--qs-accent) 20%, var(--qs-accent) 80%, transparent);
  box-shadow: 0 0 12px 0 color-mix(in srgb, var(--qs-accent) 60%, transparent);
}
.qs-wordmark {
  font-family: var(--qs-font-display);
  font-size: var(--qs-text-md);
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--qs-ink);
  text-decoration: none;
  white-space: nowrap;
}
.qs-wordmark .qs-wordmark-accent { color: var(--qs-accent); }
.qs-header .qs-grow { min-width: 0; }
.qs-crumb {
  font-size: var(--qs-text-sm);
  color: var(--qs-ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Icon button (back link, theme toggle) */
.qs-iconbtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: var(--qs-border) solid var(--qs-line);
  border-radius: var(--qs-radius-sm);
  background: var(--qs-panel);
  color: var(--qs-ink-muted);
  cursor: pointer;
  text-decoration: none;
  transition: color var(--qs-transition), border-color var(--qs-transition), background var(--qs-transition);
}
.qs-iconbtn:hover { color: var(--qs-ink); border-color: var(--qs-line-strong); background: var(--qs-panel-3); }

/* ---- Card / panel -------------------------------------------------------- */
.qs-card {
  position: relative;
  background: var(--qs-panel);
  border: var(--qs-border) solid var(--qs-line);
  border-radius: var(--qs-radius-lg);
  padding: var(--qs-5);
  box-shadow: var(--qs-shadow-sm);
  isolation: isolate;
}
.qs-card--flush { padding: 0; overflow: hidden; }
.qs-card-title {
  display: flex;
  align-items: center;
  gap: var(--qs-2);
  margin: 0 0 var(--qs-3);
  font-size: var(--qs-text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--qs-ink-muted);
}
.qs-card-title i { color: var(--qs-accent); }

/* ---- Typography helpers -------------------------------------------------- */
.qs-eyebrow {
  font-size: var(--qs-text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qs-accent);
}
.qs-title { font-size: var(--qs-text-xl); font-weight: 600; letter-spacing: -0.01em; margin: 0; }
.qs-hint { font-size: var(--qs-text-sm); color: var(--qs-ink-muted); margin: 0; }
.qs-readout {
  font-family: var(--qs-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---- Border beam --------------------------------------------------------- */
/* Shared mechanism: a conic arc masked to the border ring, revealed + spun on
   hover. Applied to primary buttons and any element carrying `.qs-beam`.
   The host element must be position:relative (all here are). */
.qs-btn--primary::after,
.qs-beam::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1.5px;
  pointer-events: none;
  z-index: 2;
  background: conic-gradient(from var(--qs-ba), transparent 0 58%, var(--qs-accent) 74%, #ffffff 82%, var(--qs-accent) 90%, transparent 100%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--qs-transition);
}
.qs-btn--primary:hover::after,
.qs-beam:hover::after { opacity: 1; animation: qs-beam-spin 2s linear infinite; }
@keyframes qs-beam-spin { to { --qs-ba: 360deg; } }

/* ---- Buttons ------------------------------------------------------------- */
.qs-btn {
  --_bg: var(--qs-panel);
  --_fg: var(--qs-ink);
  --_bd: var(--qs-line-strong);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--qs-2);
  padding: 0 var(--qs-4);
  height: 2.25rem;
  border: var(--qs-border) solid var(--_bd);
  border-radius: var(--qs-radius);
  background: var(--_bg);
  color: var(--_fg);
  font-family: inherit;
  font-size: var(--qs-text-base);
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  isolation: isolate;
  transition: background var(--qs-transition), border-color var(--qs-transition), color var(--qs-transition), box-shadow var(--qs-transition), transform var(--qs-transition);
}
.qs-btn:hover { border-color: var(--qs-line-strong); background: var(--qs-panel-3); }
.qs-btn:active { transform: translateY(1px); }
.qs-btn i { font-size: 0.9em; }

.qs-btn--primary {
  --_bg: var(--qs-accent-strong);
  --_fg: var(--qs-accent-ink);
  --_bd: transparent;
}
.qs-btn--primary:hover {
  --_bd: transparent;
  background: var(--qs-accent-strong);
  filter: brightness(1.06);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--qs-accent) 40%, transparent);
}

.qs-btn--ghost { --_bg: transparent; --_bd: transparent; --_fg: var(--qs-ink-muted); }
.qs-btn--ghost:hover { --_fg: var(--qs-ink); --_bd: transparent; background: var(--qs-accent-soft); }

.qs-btn--sm { height: 1.75rem; padding-inline: var(--qs-3); font-size: var(--qs-text-sm); }
.qs-btn--lg { height: 2.75rem; padding-inline: var(--qs-5); font-size: var(--qs-text-md); }
.qs-btn--block { display: flex; width: 100%; }
.qs-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.qs-btn:disabled::after { display: none; }

/* ---- Form controls ------------------------------------------------------- */
.qs-field { display: flex; flex-direction: column; gap: var(--qs-2); }
.qs-label {
  font-size: var(--qs-text-sm);
  font-weight: 500;
  color: var(--qs-ink-muted);
}
.qs-input,
.qs-select,
.qs-textarea {
  width: 100%;
  padding: 0 var(--qs-3);
  height: 2.25rem;
  border: var(--qs-border) solid var(--qs-line-strong);
  border-radius: var(--qs-radius);
  background: var(--qs-panel-2);
  color: var(--qs-ink);
  font-family: inherit;
  font-size: var(--qs-text-base);
  transition: border-color var(--qs-transition), box-shadow var(--qs-transition);
}
.qs-textarea { height: auto; min-height: 6rem; padding: var(--qs-2) var(--qs-3); resize: vertical; line-height: 1.5; }
.qs-input::placeholder,
.qs-textarea::placeholder { color: var(--qs-ink-faint); }
.qs-input:focus,
.qs-select:focus,
.qs-textarea:focus {
  outline: none;
  border-color: var(--qs-accent);
  box-shadow: 0 0 0 3px var(--qs-accent-ring);
}
.qs-select {
  appearance: none;
  padding-right: var(--qs-6);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239c9cab' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--qs-3) center;
}

/* ---- Segmented control (presets, ratio buttons, tabs) -------------------- */
.qs-segmented {
  display: inline-flex;
  padding: 3px;
  gap: 2px;
  border: var(--qs-border) solid var(--qs-line);
  border-radius: var(--qs-radius);
  background: var(--qs-panel-2);
}
.qs-segmented button {
  border: none;
  background: transparent;
  color: var(--qs-ink-muted);
  font-family: inherit;
  font-size: var(--qs-text-sm);
  font-weight: 500;
  padding: var(--qs-1) var(--qs-3);
  height: 1.75rem;
  border-radius: calc(var(--qs-radius-sm) - 1px);
  cursor: pointer;
  transition: background var(--qs-transition), color var(--qs-transition);
}
.qs-segmented button:hover { color: var(--qs-ink); }
.qs-segmented button[aria-pressed="true"],
.qs-segmented button.is-active {
  background: var(--qs-panel-3);
  color: var(--qs-ink);
  box-shadow: var(--qs-shadow-sm);
}

/* ---- Chip / badge -------------------------------------------------------- */
.qs-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--qs-1);
  padding: 2px var(--qs-2);
  border-radius: var(--qs-radius-full);
  font-size: var(--qs-text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--qs-accent-soft);
  color: var(--qs-accent);
}
.qs-chip--neutral { background: var(--qs-panel-2); color: var(--qs-ink-muted); }

/* ---- Focus + motion floor ------------------------------------------------ */
.qs-root :focus-visible {
  outline: 2px solid var(--qs-accent);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  .qs-root *,
  .qs-root *::before,
  .qs-root *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .qs-btn--primary:hover::after,
  .qs-beam:hover::after { animation: none !important; }
}