/* =========================================================
   Ossuary — calm, haunted design system
   =========================================================
   Tokens → Reset → Layout → Type → Cards → Buttons →
   Form controls → Flame component → Utilities
   ========================================================= */

/* ---------------------------------------------------------
   1. Design tokens
   --------------------------------------------------------- */
:root {
  /* Palette */
  --color-ground:    #1a1a1f;   /* deep charcoal — page background */
  --color-surface:   #24242b;   /* slightly lighter — card surface  */
  --color-raised:    #2e2e38;   /* interactive surface on hover     */
  --color-border:    #3a3a47;   /* subtle dividers                  */
  --color-bone:      #e8e4d9;   /* bone-white — primary text        */
  --color-muted:     #9a9488;   /* secondary / metadata text        */
  --color-dim:       #5c5852;   /* placeholder, disabled            */
  --color-ember:     #d45f2a;   /* single accent — ember orange     */
  --color-ember-dim: #7a3518;   /* ember pressed / dark tint        */
  --color-ember-glow:#f07840;   /* ember hover / flame highlight    */

  /* Semantic roles */
  --color-bg:        var(--color-ground);
  --color-fg:        var(--color-bone);
  --color-accent:    var(--color-ember);
  --color-danger:    #b04040;
  --color-ok:        #4a8c6a;

  /* Typography */
  --font-sans: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Mono", ui-monospace, monospace;

  --text-xs:   0.75rem;   /* 12 px */
  --text-sm:   0.875rem;  /* 14 px */
  --text-base: 1rem;      /* 16 px */
  --text-lg:   1.125rem;  /* 18 px */
  --text-xl:   1.375rem;  /* 22 px */
  --text-2xl:  1.75rem;   /* 28 px */
  --text-3xl:  2.25rem;   /* 36 px */

  --leading-tight:  1.25;
  --leading-normal: 1.6;

  /* Spacing scale (4-point grid) */
  --space-1:  0.25rem;   /*  4 px */
  --space-2:  0.5rem;    /*  8 px */
  --space-3:  0.75rem;   /* 12 px */
  --space-4:  1rem;      /* 16 px */
  --space-5:  1.25rem;   /* 20 px */
  --space-6:  1.5rem;    /* 24 px */
  --space-8:  2rem;      /* 32 px */
  --space-10: 2.5rem;    /* 40 px */
  --space-12: 3rem;      /* 48 px */
  --space-16: 4rem;      /* 64 px */

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.45);
  --shadow-focus: 0 0 0 3px rgba(212, 95, 42, 0.45);

  /* Transitions */
  --dur-fast: 120ms;
  --dur-base: 220ms;
  --ease:     ease;
}

/* ---------------------------------------------------------
   2. Reset & base
   --------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-ember-glow); }
button, input, select, textarea { font: inherit; }
ul, ol { list-style: none; }
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}

/* ---------------------------------------------------------
   3. Layout
   --------------------------------------------------------- */

/* App shell — two-panel: sidebar nav + main content */
.app-shell {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 100dvh;
}

.app-topbar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-6);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-topbar__title {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.app-topbar__actions {
  margin-left: auto;
  display: flex;
  gap: var(--space-3);
}

/* Content area below topbar */
.app-body {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: calc(100dvh - 52px); /* 52 px = topbar height */
  overflow: hidden;
}

/* Sidebar: list panel */
.list-panel {
  overflow-y: auto;
  border-right: 1px solid var(--color-border);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Detail / form panel */
.detail-panel {
  overflow-y: auto;
  padding: var(--space-8) var(--space-10);
  max-width: 680px;
}

/* Centered single-column page (onboarding, export, etc.) */
.page-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: var(--space-8) var(--space-4);
  text-align: center;
  gap: var(--space-6);
}

/* Standard content container */
.container {
  width: 100%;
  max-width: 720px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* Responsive: stack to single column on small screens */
@media (max-width: 640px) {
  .app-body {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
    height: auto;
  }

  .list-panel {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    max-height: 40dvh;
  }

  .detail-panel {
    padding: var(--space-5) var(--space-4);
    max-width: 100%;
  }
}

/* ---------------------------------------------------------
   4. Typography helpers
   --------------------------------------------------------- */
.text-xs   { font-size: var(--text-xs);  }
.text-sm   { font-size: var(--text-sm);  }
.text-base { font-size: var(--text-base);}
.text-lg   { font-size: var(--text-lg);  }
.text-xl   { font-size: var(--text-xl);  }
.text-2xl  { font-size: var(--text-2xl); }
.text-3xl  { font-size: var(--text-3xl); }

.text-muted   { color: var(--color-muted);  }
.text-dim     { color: var(--color-dim);    }
.text-accent  { color: var(--color-accent); }
.text-danger  { color: var(--color-danger); }
.text-ok      { color: var(--color-ok);     }

.font-mono  { font-family: var(--font-mono); }
.font-bold  { font-weight: 600; }
.leading-tight { line-height: var(--leading-tight); }

h1, h2, h3, h4 {
  line-height: var(--leading-tight);
  font-weight: 600;
  color: var(--color-bone);
}

h1 { font-size: var(--text-3xl); margin-bottom: var(--space-4); }
h2 { font-size: var(--text-2xl); margin-bottom: var(--space-3); }
h3 { font-size: var(--text-xl);  margin-bottom: var(--space-2); }
h4 { font-size: var(--text-lg);  margin-bottom: var(--space-2); }

p  { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

.meta {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

/* ---------------------------------------------------------
   5. Cards
   --------------------------------------------------------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-card);
}

.card--interactive {
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease);
}
.card--interactive:hover {
  background: var(--color-raised);
  border-color: var(--color-dim);
}
.card--interactive:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* selected state — e.g. active item in list panel */
.card--selected {
  border-color: var(--color-accent);
  background: var(--color-raised);
}

/* Danger/graveyard tint */
.card--dead {
  opacity: 0.6;
  border-color: var(--color-border);
}

/* List item card — compact */
.list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease);
}
.list-item:hover   { background: var(--color-raised); }
.list-item--active {
  background: var(--color-raised);
  border-color: var(--color-accent);
}

.list-item__icon  { flex-shrink: 0; font-size: var(--text-lg); }
.list-item__body  { flex: 1; min-width: 0; }
.list-item__title {
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.list-item__sub   {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

/* ---------------------------------------------------------
   6. Buttons
   --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease),
              color      var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
  user-select: none;
  white-space: nowrap;
}
.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Primary — ember fill */
.btn--primary {
  background: var(--color-ember);
  color: #fff;
  border-color: var(--color-ember);
}
.btn--primary:hover:not(:disabled) {
  background: var(--color-ember-glow);
  border-color: var(--color-ember-glow);
}
.btn--primary:active:not(:disabled) {
  background: var(--color-ember-dim);
  border-color: var(--color-ember-dim);
}

/* Ghost — outline only */
.btn--ghost {
  background: transparent;
  color: var(--color-bone);
  border-color: var(--color-border);
}
.btn--ghost:hover:not(:disabled) {
  background: var(--color-raised);
  border-color: var(--color-dim);
}

/* Danger */
.btn--danger {
  background: transparent;
  color: var(--color-danger);
  border-color: var(--color-danger);
}
.btn--danger:hover:not(:disabled) {
  background: var(--color-danger);
  color: #fff;
}

/* Icon-only button */
.btn--icon {
  padding: var(--space-2);
  background: transparent;
  border-color: transparent;
  color: var(--color-muted);
}
.btn--icon:hover:not(:disabled) { color: var(--color-bone); }

/* Small size modifier */
.btn--sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

/* ---------------------------------------------------------
   7. Form controls
   --------------------------------------------------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.field:last-child { margin-bottom: 0; }

.label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-bone);
}

.label--required::after {
  content: " *";
  color: var(--color-accent);
}

.hint {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.input,
.select,
.textarea {
  background: var(--color-ground);
  color: var(--color-bone);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  width: 100%;
  transition: border-color var(--dur-fast) var(--ease),
              box-shadow    var(--dur-fast) var(--ease);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-dim);
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-focus);
}

.input:disabled,
.select:disabled,
.textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.textarea {
  resize: vertical;
  min-height: 96px;
}

/* Validation states */
.input--error,
.select--error,
.textarea--error {
  border-color: var(--color-danger);
}
.field-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
}

/* Checkbox / radio group */
.check-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.check-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  cursor: pointer;
}

.check-label input[type="checkbox"],
.check-label input[type="radio"] {
  accent-color: var(--color-accent);
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

/* Form action row */
.form-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-6);
}

/* ---------------------------------------------------------
   8. Flame component
   ---------------------------------------------------------
   Three flame levels: kindling, burning, blazing.
   Applied as data-flame="kindling|burning|blazing" or
   as modifier classes .flame--kindling etc.
   --------------------------------------------------------- */
.flame {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-lg);
  line-height: 1;
  /* default: no active streak */
  filter: grayscale(1) opacity(0.35);
  transition: filter var(--dur-base) var(--ease);
}

.flame--kindling,
[data-flame="kindling"] .flame {
  filter: grayscale(0.5) opacity(0.6);
  color: #c87020;
}

.flame--burning,
[data-flame="burning"] .flame {
  filter: none;
  color: var(--color-ember);
}

.flame--blazing,
[data-flame="blazing"] .flame {
  filter: none;
  color: var(--color-ember-glow);
  text-shadow: 0 0 10px rgba(240, 120, 64, 0.7);
}

/* Streak badge — number beside the flame */
.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-muted);
}

.streak-badge .flame { font-size: 1em; }

[data-flame="kindling"] .streak-badge,
.streak-badge--kindling { color: #c87020; }

[data-flame="burning"]  .streak-badge,
.streak-badge--burning  { color: var(--color-ember); }

[data-flame="blazing"]  .streak-badge,
.streak-badge--blazing  { color: var(--color-ember-glow); }

/* Deadline bucket badges */
.bucket {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.bucket--alive  { background: rgba(74,140,106,0.18); color: var(--color-ok); }
.bucket--dying  { background: rgba(212,95,42,0.18);  color: var(--color-ember); }
.bucket--dead   { background: rgba(176,64,64,0.18);  color: var(--color-danger); }

/* ---------------------------------------------------------
   9. Empty state
   --------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-12) var(--space-4);
  text-align: center;
  color: var(--color-muted);
}

.empty-state__icon { font-size: 3rem; opacity: 0.5; }
.empty-state__title { font-size: var(--text-lg); font-weight: 500; }
.empty-state__body  { font-size: var(--text-sm);  max-width: 32ch; }

/* ---------------------------------------------------------
   10. Section / divider helpers
   --------------------------------------------------------- */
.section-title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-dim);
  padding: var(--space-3) var(--space-4) var(--space-1);
}

.stack  { display: flex; flex-direction: column; gap: var(--space-3); }
.row    { display: flex; align-items: center;    gap: var(--space-3); }
.spacer { flex: 1; }

/* Visually hidden (accessible) */
.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;
}