/**
 * OAO V2 Phase 4 — Core concept shells
 * Page skeletons for Identity / Agents / Tasks / Verification / Settlement / Space.
 * Additive only. Live actions call existing pages/modals — no fake APIs.
 */

.page-section.oao-v2-shell {
  display: none;
  flex-direction: column;
  align-items: stretch;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0 0 96px;
  box-sizing: border-box;
}

.page-section.oao-v2-shell.active {
  display: flex;
  justify-content: flex-start;
  align-items: stretch;
  overflow-y: auto;
  overflow-x: hidden;
}

#pageShellAgents.active {
  overflow: hidden;
  padding-bottom: calc(54px + env(safe-area-inset-bottom, 0px));
}

.oao-v2-shell-canvas {
  width: min(var(--oao-home-max, 960px), calc(100% - 32px));
  margin: 16px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.oao-v2-shell-hero {
  padding: 22px 20px 20px;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  border-radius: var(--oao-radius-xl, 16px);
  background:
    linear-gradient(125deg, var(--oao-color-accent-soft, rgba(255, 94, 0, 0.12)) 0%, transparent 48%),
    var(--oao-color-surface, #fff);
  box-shadow: var(--oao-shadow-sm, 0 2px 8px rgba(0, 0, 0, 0.08));
}

.oao-v2-shell-hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.oao-v2-shell-kicker {
  margin: 0 0 6px;
  font-size: var(--oao-text-xs, 0.6875rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--oao-color-primary, #ff5e00);
}

.oao-v2-shell-title {
  margin: 0;
  font-family: var(--oao-font-family-display, inherit);
  font-size: var(--oao-text-xl, 1.625rem);
  font-weight: 700;
  letter-spacing: var(--oao-tracking-tight, -0.02em);
  line-height: 1.25;
}

.oao-v2-shell-lead {
  margin: 10px 0 0;
  font-size: var(--oao-text-base, 1.125rem);
  line-height: var(--oao-leading-relaxed, 1.7);
  color: var(--oao-color-text-muted, #666);
  max-width: 44em;
}

.oao-v2-shell-question {
  margin: 12px 0 0;
  font-size: var(--oao-text-sm, 1rem);
  font-weight: 600;
  letter-spacing: 0.03em;
  opacity: 0.85;
}

.oao-v2-shell-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.oao-v2-shell-tile {
  appearance: none;
  text-align: left;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  background: var(--oao-color-surface, #fff);
  color: inherit;
  border-radius: var(--oao-radius-xl, 16px);
  padding: 16px 14px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 132px;
  box-shadow: var(--oao-shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.06));
  transition: transform var(--oao-transition-fast), box-shadow var(--oao-transition-fast), border-color var(--oao-transition-fast);
}

.oao-v2-shell-tile:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--oao-color-accent-mid, rgba(255, 94, 0, 0.28));
  box-shadow: var(--oao-shadow-md, 0 4px 12px rgba(0, 0, 0, 0.12));
}

.oao-v2-shell-tile:disabled,
.oao-v2-shell-tile.is-disabled {
  cursor: default;
  opacity: 0.92;
}

.oao-v2-shell-tile:disabled:hover,
.oao-v2-shell-tile.is-disabled:hover {
  transform: none;
  box-shadow: var(--oao-shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.06));
  border-color: var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
}

.oao-v2-shell-tile-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--oao-color-text-muted, #666);
}

.oao-v2-shell-tile-title {
  font-family: var(--oao-font-family-display, inherit);
  font-size: var(--oao-text-base, 1.125rem);
  font-weight: 600;
  line-height: 1.35;
}

.oao-v2-shell-tile-desc {
  margin: 0;
  font-size: var(--oao-text-sm, 1rem);
  line-height: 1.5;
  color: var(--oao-color-text-muted, #666);
  flex: 1;
}

.oao-v2-shell-panel {
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  border-radius: var(--oao-radius-xl, 16px);
  background: var(--oao-color-surface, #fff);
  padding: 18px 16px;
  box-shadow: var(--oao-shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.06));
}

.oao-v2-shell-panel h3 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.oao-v2-shell-panel p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--oao-color-text-muted, #666);
}

.oao-v2-shell-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.oao-v2-shell-soon {
  border-style: dashed;
  background:
    linear-gradient(180deg, var(--oao-status-soon-bg, rgba(217, 119, 6, 0.12)), transparent 70%),
    var(--oao-color-surface, #fff);
}

.oao-v2-shell-task-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-top: 12px;
}

.oao-v2-shell-task-row textarea {
  width: 100%;
  min-height: 72px;
  resize: vertical;
  box-sizing: border-box;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  border-radius: var(--oao-input-radius, 8px);
  padding: 12px 14px;
  font: inherit;
  background: var(--input-bg, transparent);
  color: inherit;
}

.oao-v2-shell-task-row textarea:focus {
  outline: none;
  border-color: var(--oao-color-primary, #ff5e00);
  box-shadow: var(--oao-focus-ring);
}

.oao-v2-shell-task-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.oao-v2-shell-task-list li {
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  border-radius: var(--oao-radius-md, 8px);
  padding: 10px 12px;
  font-size: 13px;
}

.oao-v2-shell-empty {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--oao-color-text-muted, #666);
}

[data-theme="dark"] .oao-v2-shell-hero,
[data-theme="dark"] .oao-v2-shell-tile,
[data-theme="dark"] .oao-v2-shell-panel {
  background-color: #1a1a1a;
}

[data-theme="dark"] .oao-v2-shell-hero {
  background:
    linear-gradient(125deg, var(--oao-color-accent-soft, rgba(255, 154, 68, 0.16)) 0%, transparent 48%),
    #1a1a1a;
}

@media (max-width: 900px) {
  .oao-v2-shell-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .oao-v2-shell-canvas {
    width: calc(100% - 24px);
  }

  .oao-v2-shell-grid {
    grid-template-columns: 1fr;
  }

  .oao-v2-shell-task-row {
    grid-template-columns: 1fr;
  }

  .oao-v2-shell-hero-top {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .oao-v2-shell-tile:hover:not(:disabled) {
    transform: none;
  }
}

/* ── Phase 5 Task Prototype ── */
.oao-v2-task-create {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.oao-v2-task-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.oao-v2-task-list-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.oao-v2-task-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.oao-v2-task-filter {
  appearance: none;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  background: transparent;
  color: inherit;
  border-radius: var(--oao-radius-full, 9999px);
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.oao-v2-task-filter.is-active {
  background: var(--oao-color-primary, #ff5e00);
  border-color: var(--oao-color-primary, #ff5e00);
  color: #fff;
}

.oao-v2-shell-task-list .oao-v2-task-item {
  border: 0;
  padding: 0;
  background: transparent;
}

.oao-v2-task-item-btn {
  width: 100%;
  appearance: none;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  background: var(--oao-color-surface, #fff);
  color: inherit;
  border-radius: var(--oao-radius-md, 8px);
  padding: 12px;
  text-align: left;
  cursor: pointer;
  display: grid;
  gap: 8px;
  transition: border-color var(--oao-transition-fast), box-shadow var(--oao-transition-fast);
}

.oao-v2-task-item.is-selected .oao-v2-task-item-btn,
.oao-v2-task-item-btn:hover {
  border-color: var(--oao-color-accent-mid, rgba(255, 94, 0, 0.28));
  box-shadow: var(--oao-shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.06));
}

.oao-v2-task-item-title {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}

.oao-v2-task-item-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
  color: var(--oao-color-text-muted, #666);
}

.oao-v2-task-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--oao-radius-full, 9999px);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.oao-v2-task-badge.is-draft {
  color: var(--oao-status-prototype, #c2410c);
  background: var(--oao-status-prototype-bg, rgba(194, 65, 12, 0.12));
}

.oao-v2-task-badge.is-open {
  color: var(--oao-status-live, #059669);
  background: var(--oao-status-live-bg, rgba(5, 150, 105, 0.1));
}

.oao-v2-task-badge.is-done {
  color: var(--oao-color-text-muted, #666);
  background: var(--oao-color-surface-soft, rgba(18, 18, 18, 0.04));
}

.oao-v2-task-detail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.oao-v2-task-field-label {
  display: block;
  margin: 10px 0 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--oao-color-text-muted, #666);
}

.oao-v2-task-detail textarea,
.oao-v2-task-detail select {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  border-radius: var(--oao-input-radius, 8px);
  padding: 10px 12px;
  font: inherit;
  background: var(--input-bg, transparent);
  color: inherit;
}

.oao-v2-task-detail textarea:focus,
.oao-v2-task-detail select:focus {
  outline: none;
  border-color: var(--oao-color-primary, #ff5e00);
  box-shadow: var(--oao-focus-ring);
}

.oao-v2-task-meta,
.oao-v2-task-hint {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--oao-color-text-muted, #666);
}

.oao-v2-home-task-item {
  border: 0 !important;
  padding: 0 !important;
  background: transparent !important;
}

.oao-v2-home-task-btn {
  width: 100%;
  appearance: none;
  border: 1px solid var(--oao-color-border-soft, rgba(18, 18, 18, 0.14));
  background: var(--oao-color-surface, #fff);
  color: inherit;
  border-radius: var(--oao-radius-md, 8px);
  padding: 10px 12px;
  text-align: left;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.oao-v2-home-task-btn:hover {
  border-color: var(--oao-color-primary, #ff5e00);
}

[data-theme="dark"] .oao-v2-task-item-btn,
[data-theme="dark"] .oao-v2-home-task-btn {
  background: #1a1a1a;
}

@media (max-width: 900px) {
  .oao-v2-task-workspace {
    grid-template-columns: 1fr;
  }

  .oao-v2-task-list-head {
    flex-direction: column;
  }
}