/* =========================================================================
   SUMO Dashboard — M1 styles
   Mobile-first, vanilla CSS, dark/light via prefers-color-scheme
   ========================================================================= */

:root {
  /* Color tokens — light */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-border: #e2e8f0;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-inverse: #ffffff;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;

  /* Status badge palette */
  --status-open-bg: #e5e7eb;
  --status-open-fg: #374151;
  --status-proposed-bg: #fef3c7;
  --status-proposed-fg: #92400e;
  --status-confirmed-bg: #dbeafe;
  --status-confirmed-fg: #1e40af;
  --status-in_progress-bg: #ede9fe;
  --status-in_progress-fg: #5b21b6;
  --status-done-bg: #dcfce7;
  --status-done-fg: #166534;
  --status-blocked-bg: #fee2e2;
  --status-blocked-fg: #991b1b;
  --status-split_requested-bg: #ffedd5;
  --status-split_requested-fg: #9a3412;

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

  /* Radii / shadow */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.18);

  /* Layout */
  --max-w: 600px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans Thai", "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0b1220;
    --color-surface: #111827;
    --color-surface-alt: #1f2937;
    --color-border: #1f2937;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-text-inverse: #0f172a;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;

    /* Status badge palette — dark mode */
    --status-open-bg: #374151;
    --status-open-fg: #e5e7eb;
    --status-proposed-bg: #78350f;
    --status-proposed-fg: #fef3c7;
    --status-confirmed-bg: #1e3a8a;
    --status-confirmed-fg: #dbeafe;
    --status-in_progress-bg: #4c1d95;
    --status-in_progress-fg: #ede9fe;
    --status-done-bg: #14532d;
    --status-done-fg: #dcfce7;
    --status-blocked-bg: #7f1d1d;
    --status-blocked-fg: #fee2e2;
    --status-split_requested-bg: #7c2d12;
    --status-split_requested-fg: #ffedd5;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ---------- Header ---------- */
.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 5;
}

.app-header__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-4);
}

.app-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.app-subtitle {
  margin: var(--space-1) 0 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ---------- Main / Toolbar ---------- */
.app-main {
  flex: 1;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

.filters {
  display: inline-flex;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.filter-btn {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--color-text-muted);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  min-height: 36px;
  transition: background 120ms ease, color 120ms ease;
}

.filter-btn:hover { color: var(--color-text); }

.filter-btn.is-active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* ---------- Buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  min-height: 40px;
  min-width: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease, transform 80ms ease;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

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

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover:not(:disabled) { background: var(--color-surface-alt); }

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

.icon-btn {
  appearance: none;
  background: transparent;
  border: 0;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  min-width: 40px;
  min-height: 40px;
}
.icon-btn:hover { color: var(--color-text); background: var(--color-surface-alt); }

/* ---------- Task list ---------- */
.task-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.task-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.task-card:hover { box-shadow: var(--shadow-md); }
.task-card:active { transform: scale(0.995); }

.task-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.task-card__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  word-break: break-word;
}

.task-card__body {
  margin: var(--space-2) 0 var(--space-3);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-break: break-word;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.task-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.task-card__time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.task-card__actions {
  display: inline-flex;
  gap: var(--space-1);
}

/* ---------- Status badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: var(--space-1) var(--space-2);
  border-radius: 999px;
  background: var(--color-surface-alt);
  color: var(--color-text);
  white-space: nowrap;
}

.badge--open { background: var(--status-open-bg); color: var(--status-open-fg); }
.badge--proposed { background: var(--status-proposed-bg); color: var(--status-proposed-fg); }
.badge--confirmed { background: var(--status-confirmed-bg); color: var(--status-confirmed-fg); }
.badge--in_progress { background: var(--status-in_progress-bg); color: var(--status-in_progress-fg); }
.badge--done { background: var(--status-done-bg); color: var(--status-done-fg); }
.badge--blocked { background: var(--status-blocked-bg); color: var(--status-blocked-fg); }
.badge--split_requested { background: var(--status-split_requested-bg); color: var(--status-split_requested-fg); }

/* ---------- Loading / Empty ---------- */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-5);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}

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

.empty-state {
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.empty-state p { margin: 0; font-size: 0.95rem; }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

@media (min-width: 540px) {
  .modal { align-items: center; padding: var(--space-4); }
}

.modal[hidden] { display: none; }

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(2px);
}

.modal__panel {
  position: relative;
  background: var(--color-surface);
  width: 100%;
  max-width: var(--max-w);
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
  max-height: 90dvh;
  overflow: hidden;
}

@media (min-width: 540px) {
  .modal__panel {
    border-radius: var(--radius-lg);
  }
}

.modal__panel--narrow { max-width: 420px; }

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.modal__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.modal__body {
  padding: var(--space-4);
  color: var(--color-text-muted);
  margin: 0;
}

.modal__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-4);
  overflow-y: auto;
}

.modal__footer {
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4);
  margin-top: var(--space-2);
  background: var(--color-surface);
}

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

.field__label {
  font-size: 0.85rem;
  font-weight: 600;
}

.field__optional {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.field__hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.field input[type="text"],
.field textarea {
  appearance: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font: inherit;
  font-size: 0.95rem;
  padding: var(--space-3);
  width: 100%;
  resize: vertical;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.field input[type="text"]:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] {
  border-color: var(--color-danger);
}

/* ---------- Toast ---------- */
.toast-region {
  position: fixed;
  left: 50%;
  bottom: var(--space-5);
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
  width: min(90vw, 360px);
}

.toast {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-md);
  font-size: 0.9rem;
  pointer-events: auto;
  animation: toast-in 200ms ease-out;
}

.toast--error { border-left-color: var(--color-danger); }
.toast--success { border-left-color: #16a34a; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Utilities ---------- */
[hidden] { display: none !important; }

/* ---------- Narrow mobile tweaks (≤360px) ---------- */
@media (max-width: 360px) {
  .app-header__inner,
  .app-main {
    padding: var(--space-3);
  }
  .filter-btn { padding: var(--space-2); font-size: 0.8rem; }
}