/* ===== Tokens ===== */
:root {
  --canvas: #faf9f5;
  --surface: #ffffff;
  --surface-2: #f1efe7;
  --surface-3: #eae7dc;
  --ink: #14181f;
  --ink-muted: #5b6472;
  --ink-faint: #8a8f99;
  --border: #e2ded2;
  --border-strong: #cdc7b6;
  --accent: #ff5a1f;
  --accent-strong: #c23e10;
  --accent-strong-hover: #a6350c;
  --accent-ink: #7a2600;
  --accent-surface: #fff0e8;
  --on-accent: #fff8f5;
  --focus: #1d4ed8;

  --status-todo: #5b6472;
  --status-todo-bg: #eceef1;
  --status-in-progress: #a6570a;
  --status-in-progress-bg: #fbecd6;
  --status-blocked: #c22929;
  --status-blocked-bg: #fbe6e6;
  --status-done: #0d7a52;
  --status-done-bg: #e2f3ea;

  --font-display: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Roboto Mono", Menlo, Consolas, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-panel: -12px 0 40px rgba(20, 24, 31, 0.14);
  --shadow-card: 0 1px 2px rgba(20, 24, 31, 0.04);
  --transition-fast: 140ms ease;
  --transition-med: 240ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p, dl, dd, dt { margin: 0; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--on-accent);
  padding: var(--space-3) var(--space-4);
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

button, input, select {
  font-family: inherit;
  color: inherit;
}

/* ===== Topbar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--canvas);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1360px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-6) var(--space-4);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark { flex-shrink: 0; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-top: 2px;
}

.controls {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.field label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 12px;
  color: var(--ink-faint);
  pointer-events: none;
}

#search-input {
  width: 260px;
  max-width: 60vw;
  padding: 10px 14px 10px 36px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface);
  font-size: 15px;
}

#search-input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
}

#filter-select {
  padding: 10px 36px 10px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="8" viewBox="0 0 12 8"><path d="M1 1L6 6L11 1" stroke="%235B6472" stroke-width="1.6" fill="none" stroke-linecap="round" stroke-linejoin="round"/></svg>') no-repeat right 14px center;
  appearance: none;
  -webkit-appearance: none;
  font-size: 15px;
  min-width: 168px;
}

.track-rule {
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--accent) 0px,
    var(--accent) 22px,
    transparent 22px,
    transparent 38px
  );
  opacity: 0.9;
}

/* ===== Main / board intro ===== */
main {
  max-width: 1360px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-6) var(--space-8);
}

.board-intro {
  margin-bottom: var(--space-6);
  max-width: 720px;
}

.board-heading {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 3.2vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.board-sub {
  margin-top: var(--space-2);
  color: var(--ink-muted);
  font-size: 16px;
}

/* ===== Board / lanes ===== */
.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
  align-items: start;
}

.board[data-single="true"] {
  grid-template-columns: minmax(0, 560px);
  justify-content: center;
}

.lane {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 0;
}

.lane-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: 2px dashed var(--border-strong);
}

.lane-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.status-todo-dot { background: var(--status-todo); }
.status-in-progress-dot { background: var(--status-in-progress); }
.status-blocked-dot { background: var(--status-blocked); }
.status-done-dot { background: var(--status-done); }

.lane-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  flex: 1;
}

.lane-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
  min-width: 22px;
  text-align: center;
}

.lane-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.lane-empty {
  font-size: 13px;
  color: var(--ink-faint);
  padding: var(--space-3);
  text-align: center;
}

/* ===== Item card ===== */
.item {
  list-style: none;
}

.item-btn {
  width: 100%;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--lane-accent, var(--border-strong));
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.item-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(20, 24, 31, 0.1);
  border-color: var(--border-strong);
}

.item-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.priority-badge {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--ink-muted);
  background: var(--surface);
}

.priority-badge.priority-high {
  color: var(--accent-ink);
  background: var(--accent-surface);
  border-color: #f5c7ac;
}

.item-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.item-summary {
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.item-row-bottom {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-1);
  font-size: 12.5px;
  color: var(--ink-muted);
}

.assignee {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--ink);
}

.avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--surface-3);
  border: 1px solid var(--border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  color: var(--ink);
  flex-shrink: 0;
}

.due {
  font-family: var(--font-mono);
}
.due.due-overdue { color: var(--status-blocked); font-weight: 600; }
.due.due-today { color: var(--status-in-progress); font-weight: 600; }

.comments {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  margin-left: auto;
}

/* ===== Empty state ===== */
.empty-state {
  max-width: 420px;
  margin: var(--space-8) auto;
  text-align: center;
  color: var(--ink-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.empty-state svg { color: var(--border-strong); margin-bottom: var(--space-2); }

.empty-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.empty-body { font-size: 14px; }

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent-strong);
  color: var(--on-accent);
  margin-top: var(--space-2);
}
.btn-primary:hover { background: var(--accent-strong-hover); }

.board-footnote {
  margin-top: var(--space-7);
  text-align: center;
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--ink-faint);
}

/* ===== Scrim & detail panel ===== */
.scrim {
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 31, 0.38);
  z-index: 30;
  opacity: 0;
  transition: opacity var(--transition-med);
}
.scrim.visible { opacity: 1; }

.detail-panel {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(460px, 100vw);
  background: var(--surface);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-panel);
  z-index: 31;
  transform: translateX(100%);
  transition: transform var(--transition-med);
  display: flex;
}

.detail-panel.open {
  transform: translateX(0);
}

.detail-scroll {
  overflow-y: auto;
  width: 100%;
  padding: var(--space-5) var(--space-5) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.detail-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--lane-accent, var(--accent));
}

.detail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.close-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.close-btn:hover { background: var(--surface-2); color: var(--ink); }

.detail-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.detail-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3) var(--space-4);
  padding: var(--space-4);
  background: var(--surface-2);
  border-radius: var(--radius-md);
}

.detail-meta-grid div {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.detail-meta-grid dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.detail-meta-grid dd {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.status-field select {
  width: 100%;
  padding: 12px 40px 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="8" viewBox="0 0 12 8"><path d="M1 1L6 6L11 1" stroke="%235B6472" stroke-width="1.6" fill="none" stroke-linecap="round" stroke-linejoin="round"/></svg>') no-repeat right 14px center;
  appearance: none;
  -webkit-appearance: none;
  font-size: 15px;
  font-weight: 600;
}

.status-feedback {
  margin-top: var(--space-2);
  font-size: 13px;
  font-weight: 600;
  color: var(--status-done);
  min-height: 18px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.status-feedback.visible { opacity: 1; }

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag-chip {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--ink-muted);
}

.detail-copy {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  border-top: 1px solid var(--border);
  padding-top: var(--space-4);
}

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .board {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar-inner {
    padding: var(--space-4) var(--space-4) var(--space-3);
    align-items: flex-start;
  }
  .controls {
    width: 100%;
  }
  .field { flex: 1 1 140px; }
  #search-input {
    width: 100%;
    max-width: none;
  }
  main {
    padding: var(--space-4) var(--space-4) var(--space-7);
  }
  .board-heading { font-size: 26px; }
  .detail-panel {
    width: 100%;
  }
  .detail-meta-grid {
    grid-template-columns: 1fr 1fr;
  }
}