/* Design tokens ------------------------------------------------------- */
/* Two modes: dark ("A") uses a violet accent, light ("C") uses a teal
   accent — each mode keeps its own accent hue rather than sharing one,
   matching the approved A/C toggle design. */

:root {
  --bg: #faf9f7;
  --bg-subtle: radial-gradient(ellipse 900px 500px at 50% -10%, rgba(15, 118, 110, 0.07), transparent 70%);
  --card: #ffffff;
  --card-2: #f7f7f5;
  --border: #e4e4e7;
  --border-strong: #d4d4d8;
  --ink: #18181b;
  --ink-dim: #71717a;
  --ink-faint: #a1a1aa;
  --accent: #0f766e;
  --accent-hover: #0c5f58;
  --accent-ink: #ffffff;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #0f766e;
  --success-hover: #0c5f58;
  --input-bg: #fafafa;
  --secondary-bg: #f4f4f5;
  --secondary-hover: #e9e9ec;
  --secondary-border: #e4e4e7;
  --ghost-border: #e4e4e7;
  --ghost-ink: #3f3f46;
  --scrim: rgba(24, 24, 27, 0.5);
  --focus-ring: rgba(15, 118, 110, 0.25);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(24, 24, 27, 0.05);
  --shadow-md: 0 8px 24px -8px rgba(24, 24, 27, 0.14);
  --shadow-lg: 0 24px 64px -16px rgba(24, 24, 27, 0.22);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0e;
    --bg-subtle: radial-gradient(ellipse 900px 500px at 50% -10%, rgba(109, 94, 252, 0.10), transparent 70%);
    --card: #16161a;
    --card-2: #1b1b20;
    --border: #26262c;
    --border-strong: #34343c;
    --ink: #fafafa;
    --ink-dim: #8a8a94;
    --ink-faint: #5c5c66;
    --accent: #6d5efc;
    --accent-hover: #7d6fff;
    --accent-ink: #ffffff;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --success-hover: #0da271;
    --input-bg: #0f0f12;
    --secondary-bg: #1e1e24;
    --secondary-hover: #26262e;
    --secondary-border: #2e2e36;
    --ghost-border: #2a2a30;
    --ghost-ink: #c9c9d2;
    --scrim: rgba(6, 6, 8, 0.65);
    --focus-ring: rgba(109, 94, 252, 0.35);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 24px 64px -16px rgba(0, 0, 0, 0.55);
  }
}

:root[data-theme="dark"] {
  --bg: #0b0b0e;
  --bg-subtle: radial-gradient(ellipse 900px 500px at 50% -10%, rgba(109, 94, 252, 0.10), transparent 70%);
  --card: #16161a;
  --card-2: #1b1b20;
  --border: #26262c;
  --border-strong: #34343c;
  --ink: #fafafa;
  --ink-dim: #8a8a94;
  --ink-faint: #5c5c66;
  --accent: #6d5efc;
  --accent-hover: #7d6fff;
  --accent-ink: #ffffff;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --success-hover: #0da271;
  --input-bg: #0f0f12;
  --secondary-bg: #1e1e24;
  --secondary-hover: #26262e;
  --secondary-border: #2e2e36;
  --ghost-border: #2a2a30;
  --ghost-ink: #c9c9d2;
  --scrim: rgba(6, 6, 8, 0.65);
  --focus-ring: rgba(109, 94, 252, 0.35);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 64px -16px rgba(0, 0, 0, 0.55);
}

:root[data-theme="light"] {
  --bg: #faf9f7;
  --bg-subtle: radial-gradient(ellipse 900px 500px at 50% -10%, rgba(15, 118, 110, 0.07), transparent 70%);
  --card: #ffffff;
  --card-2: #f7f7f5;
  --border: #e4e4e7;
  --border-strong: #d4d4d8;
  --ink: #18181b;
  --ink-dim: #71717a;
  --ink-faint: #a1a1aa;
  --accent: #0f766e;
  --accent-hover: #0c5f58;
  --accent-ink: #ffffff;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #0f766e;
  --success-hover: #0c5f58;
  --input-bg: #fafafa;
  --secondary-bg: #f4f4f5;
  --secondary-hover: #e9e9ec;
  --secondary-border: #e4e4e7;
  --ghost-border: #e4e4e7;
  --ghost-ink: #3f3f46;
  --scrim: rgba(24, 24, 27, 0.5);
  --focus-ring: rgba(15, 118, 110, 0.25);

  --shadow-sm: 0 1px 2px rgba(24, 24, 27, 0.05);
  --shadow-md: 0 8px 24px -8px rgba(24, 24, 27, 0.14);
  --shadow-lg: 0 24px 64px -16px rgba(24, 24, 27, 0.22);
}

/* Global ---------------------------------------------------------------- */

* { box-sizing: border-box; }

/* Tailwind's .hidden and component classes like .btn both set `display`
   at equal specificity; since this file loads after tailwind.css, .btn
   would silently win. .hidden must always win regardless of what else
   sets display on the same element. */
.hidden { display: none !important; }

body {
  background: var(--bg-subtle), var(--bg);
  color: var(--ink);
  transition: background-color 0.2s ease, color 0.2s ease;
}

::selection { background: var(--accent); color: var(--accent-ink); }

a { color: inherit; }

/* Buttons ----------------------------------------------------------------
   One shared shape/motion system; color comes from the variant only. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0.65em 1.1em;
  font: inherit;
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn-secondary { background: var(--secondary-bg); color: var(--ink); border-color: var(--secondary-border); }
.btn-secondary:hover:not(:disabled) { background: var(--secondary-hover); border-color: var(--border-strong); }

.btn-danger { background: var(--danger); color: #ffffff; }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); }

.btn-success { background: var(--success); color: #ffffff; }
.btn-success:hover:not(:disabled) { background: var(--success-hover); }

.btn-ghost { background: transparent; color: var(--ghost-ink); border-color: var(--ghost-border); }
.btn-ghost:hover:not(:disabled) { background: var(--card-2); }

.btn-sm { padding: 0.45em 0.8em; font-size: 0.8125rem; border-radius: var(--radius-sm); }
.btn-block { width: 100%; }

.fab {
  /* Fluid sizing instead of a fixed 3rem: shrinks on narrow phones, grows
     on large displays (this app is sometimes shown on a TV/big screen). */
  width: clamp(2.5rem, 3vw + 1.5rem, 4rem);
  height: clamp(2.5rem, 3vw + 1.5rem, 4rem);
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--ink-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  font-size: clamp(1rem, 1.2vw + 0.6rem, 1.5rem);
  flex-shrink: 0;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.fab:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }
.fab:active { transform: translateY(0); }

/* Groups the bottom-left utility buttons (info/help/usage/feedback) so
   their spacing scales together with the fluid .fab size above, instead
   of each button being pinned to a fixed pixel offset. */
.fab-row {
  position: fixed;
  bottom: clamp(0.75rem, 2vw, 1.5rem);
  left: clamp(0.75rem, 2vw, 1.5rem);
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1rem);
  z-index: 40;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ghost-border);
  background: transparent;
  color: var(--ghost-ink);
  border-radius: 50%;
  width: 2.25rem;
  height: 2.25rem;
  cursor: pointer;
  padding: 0;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.icon-btn:hover { background: var(--card-2); transform: scale(1.05); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--focus-ring); }
.icon-btn svg { width: 1.05rem; height: 1.05rem; stroke: currentColor; }

/* Surfaces ---------------------------------------------------------------- */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  color: var(--ink);
}

.chip {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* Alerts: neutral surface, semantic color carried only by the left border.
   Semantic color is intentionally separate from --accent. */
.alert {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--ink-faint);
  border-radius: var(--radius);
  padding: 0.9em 1em;
  color: var(--ink);
  font-size: 0.875rem;
  line-height: 1.5;
}
.alert-info { border-left-color: #3b82f6; }
.alert-warning { border-left-color: #f59e0b; }
.alert-success { border-left-color: var(--success); }

/* Form fields ---------------------------------------------------------- */

.field {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--ink);
  padding: 0.75em 0.9em;
  font: inherit;
  font-size: 0.9375rem;
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.field::placeholder { color: var(--ink-faint); }
.field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.field[type="color"] { padding: 0.3em; height: 2.75rem; cursor: pointer; }

label.field-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-dim);
  margin-bottom: 0.4em;
}

/* Toggle switch --------------------------------------------------------- */

.toggle-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  cursor: pointer;
}
.toggle-switch-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.toggle-switch-track {
  width: 2.75rem;
  height: 1.5rem;
  border-radius: 999px;
  background: var(--secondary-bg);
  border: 1px solid var(--secondary-border);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.toggle-switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  background: var(--ink-faint);
  transition: transform 0.15s ease, background-color 0.15s ease;
}
.toggle-switch-input:checked ~ .toggle-switch-track {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle-switch-input:checked ~ .toggle-switch-track .toggle-switch-thumb {
  transform: translateX(1.25rem);
  background: var(--accent-ink);
}
.toggle-switch-input:focus-visible ~ .toggle-switch-track {
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.toggle-switch-input:disabled ~ .toggle-switch-track {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Spinner ------------------------------------------------------------------ */

.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  opacity: 0.7;
  animation: spinner-rotate 0.65s linear infinite;
  flex-shrink: 0;
}

@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}

/* Divider ---------------------------------------------------------------- */

.divider {
  display: flex;
  align-items: center;
  gap: 0.75em;
  color: var(--ink-faint);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Theme toggle ------------------------------------------------------------ */

.theme-toggle { position: relative; }
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  width: 1.05rem;
  height: 1.05rem;
  transition: opacity 0.15s ease, transform 0.2s ease;
}
:root:not([data-theme="light"]) .theme-toggle .icon-sun { opacity: 1; transform: rotate(0deg); }
:root:not([data-theme="light"]) .theme-toggle .icon-moon { opacity: 0; transform: rotate(-40deg); }
:root[data-theme="light"] .theme-toggle .icon-sun { opacity: 0; transform: rotate(40deg); }
:root[data-theme="light"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg); }

@media (prefers-reduced-motion: reduce) {
  .btn, .icon-btn, .field, .theme-toggle .icon-sun, .theme-toggle .icon-moon {
    transition: none;
  }
}