/* --- Palette: matches /study/style.css --- */
:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-gradient: linear-gradient(135deg, #3b82f6, #2563eb);

  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;

  --bg-color: #09090b;
  --surface-color: #18181b;
  --surface-hover: #27272a;
  --surface-overlay: rgba(24, 24, 27, 0.75);

  --text-color: #fafafa;
  --text-muted: #a1a1aa;
  --border-color: #27272a;

  --gutter: 16px;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

[hidden] {
  display: none !important;
}

.muted {
  color: var(--text-muted);
}

.small {
  font-size: 0.85rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--surface-hover);
  padding: 1px 5px;
  border-radius: 4px;
}

/* --- Header --- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 0 var(--gutter);
  height: 64px;
  background-color: var(--surface-overlay);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header h1 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.3px;
  white-space: nowrap;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text-color);
  background: var(--surface-hover);
}

/* --- Buttons --- */
.btn-primary,
.btn-secondary,
.btn-ghost,
.btn-danger {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  line-height: 1.2;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--surface-hover);
  color: var(--text-color);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: #3f3f46;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border-color);
}

.btn-ghost:hover {
  color: var(--text-color);
  background: var(--surface-hover);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: var(--border-color);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.12);
  border-color: var(--danger);
}

.btn-sm {
  padding: 7px 13px;
  font-size: 0.85rem;
}

.btn-xs {
  padding: 4px 10px;
  font-size: 0.78rem;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button:active:not(:disabled) {
  transform: scale(0.97);
}

/* --- Inputs --- */
input[type="text"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s ease;
}

input[type="text"]:focus,
input[type="search"]:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.5;
}

/* --- Gate (signed out / loading) --- */
.gate {
  display: flex;
  justify-content: center;
  padding: 64px var(--gutter);
}

.gate-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 32px 24px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.gate-card h2 {
  margin: 0;
  font-size: 1.25rem;
}

.gate-card p {
  margin: 0;
}

/* --- Layout --- */
.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 24px var(--gutter) 80px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
  }
  .deck-panel {
    position: sticky;
    top: 88px;
    max-height: calc(100vh - 112px);
    overflow-y: auto;
  }
}

.deck-panel,
.cards-panel {
  min-width: 0;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.panel-head h2 {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  font-weight: 600;
}

.inline-form {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.inline-form-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.form-error {
  margin: 0;
  color: var(--danger);
  font-size: 0.85rem;
}

/* --- Deck list --- */
.deck-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.deck-group-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  padding: 4px 2px 8px;
  cursor: pointer;
  text-align: left;
}

.deck-group-head:hover {
  color: var(--text-color);
}

.deck-group-head .caret {
  display: inline-block;
  width: 1em;
  text-align: center;
}

.deck-group-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.deck-badge {
  font-size: 0.68rem;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 1px 7px;
  white-space: nowrap;
}

.deck-counts {
  margin-top: -2px;
}

.stat.known {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
}

.stat.known.zero {
  background: var(--surface-hover);
  color: var(--text-muted);
}

.stat.err {
  color: var(--danger);
}

.empty-state.small {
  padding: 16px 12px;
  font-size: 0.85rem;
}

.deck-item {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 12px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.deck-item:hover {
  background: var(--surface-hover);
}

.deck-item.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
}

.deck-item-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.deck-name {
  font-weight: 600;
  font-size: 1rem;
  overflow-wrap: anywhere;
}

.deck-count {
  color: var(--text-muted);
  font-size: 0.8rem;
  white-space: nowrap;
}

.deck-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.78rem;
}

.stat {
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-hover);
  color: var(--text-muted);
  white-space: nowrap;
}

.stat.due {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
}

.stat.due.zero {
  background: var(--surface-hover);
  color: var(--text-muted);
}

.stat.new {
  background: rgba(37, 99, 235, 0.18);
  color: #93c5fd;
}

.stat.new.zero {
  background: var(--surface-hover);
  color: var(--text-muted);
}

.kanji-levels {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.kanji-levels .lvl {
  white-space: nowrap;
}

.kanji-levels .lvl b {
  color: var(--text-color);
  font-weight: 600;
}

.kanji-levels .sep {
  opacity: 0.5;
}

.deck-lock {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* --- Deck header (selected deck) --- */
.deck-header {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.deck-header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.deck-header h2 {
  margin: 0;
  font-size: 1.3rem;
  overflow-wrap: anywhere;
}

.deck-header .deck-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.deck-header .deck-stats {
  font-size: 0.85rem;
}

.rename-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  width: 100%;
}

.rename-form input {
  flex: 1 1 200px;
}

/* --- Card tools: tabs, search, filter, bulk --- */
.card-tools {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border-color);
}

.tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: -1px;
  transition: all 0.15s ease;
}

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

.tab.active {
  color: var(--text-color);
  border-bottom-color: var(--primary);
}

.tab-count {
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.8em;
  margin-left: 2px;
}

.tab-note {
  margin: 0;
}

.tools-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.tools-row input {
  flex: 1 1 200px;
  min-width: 0;
}

.tools-row select {
  width: auto;
  flex: 0 0 auto;
  padding-right: 28px;
}

.bulk-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.list-summary {
  padding: 2px 4px;
}

.show-more {
  align-self: center;
  margin-top: 6px;
}

.add-panel {
  background: var(--surface-color);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.add-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Card list --- */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-item {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-body {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.card-text {
  flex: 1;
  min-width: 0;
}

.card-ja {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.card-en {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 4px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.card-en.none {
  font-style: italic;
  opacity: 0.7;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.chip {
  padding: 2px 9px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.chip.new {
  background: rgba(37, 99, 235, 0.18);
  color: #93c5fd;
}

.chip.learning {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
}

.chip.review {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
}

.chip.readonly {
  background: var(--surface-hover);
  color: var(--text-muted);
}

.card-due.overdue {
  color: #fbbf24;
  font-weight: 600;
}

.card-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.card-actions button {
  padding: 5px 11px;
  font-size: 0.78rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.card-actions button:hover:not(:disabled) {
  color: var(--text-color);
  background: var(--surface-hover);
}

.card-actions button.danger:hover:not(:disabled) {
  color: var(--danger);
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.12);
}

/* Known state */
.card-item.known .card-text,
.card-item.known .kanji-char,
.card-item.known .kanji-info {
  opacity: 0.55;
}

.chip.known {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
}

.chip.lvl {
  background: var(--surface-hover);
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
}

.mode-chip {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-hover);
  color: var(--text-muted);
  white-space: nowrap;
}

.mode-chip.due {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
}

.mode-chip.later {
  background: rgba(16, 185, 129, 0.12);
  color: #6ee7b7;
}

.card-actions .pill {
  border-color: var(--border-color);
  color: var(--text-muted);
}

.card-actions .pill:hover:not(:disabled) {
  color: #6ee7b7;
  border-color: rgba(16, 185, 129, 0.5);
  background: rgba(16, 185, 129, 0.1);
}

.card-actions .pill.on {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.5);
  color: #6ee7b7;
}

.card-actions .pill.on:hover:not(:disabled) {
  color: #fbbf24;
  border-color: rgba(245, 158, 11, 0.5);
  background: rgba(245, 158, 11, 0.12);
}

/* Kanji rows */
.kanji-row {
  flex-direction: row;
  align-items: flex-start;
  gap: 14px;
}

.kanji-char {
  font-size: 2.2rem;
  line-height: 1;
  font-weight: 500;
  min-width: 2.4rem;
  text-align: center;
  padding-top: 2px;
}

.kanji-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.kanji-meanings {
  font-size: 1rem;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.kanji-readings {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.kanji-row .card-actions {
  flex: 0 0 auto;
}

.card-edit {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-edit label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.card-edit textarea {
  min-height: 56px;
}

.card-link {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Empty / error states --- */
.empty-state {
  text-align: center;
  padding: 36px 16px;
  color: var(--text-muted);
  background: var(--surface-color);
  border-radius: var(--radius);
  border: 1px dashed var(--border-color);
}

.empty-state.error {
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.4);
}

.empty-state button {
  margin-top: 12px;
}

/* --- Toast --- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--surface-hover);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: 999px;
  font-size: 0.9rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  z-index: 100;
  max-width: calc(100% - 2 * var(--gutter));
  text-align: center;
}

.toast.error {
  border-color: var(--danger);
  color: #fca5a5;
}

/* --- Mobile tweaks --- */
@media (max-width: 899px) {
  .card-body {
    flex-direction: column;
  }
  .card-actions {
    justify-content: flex-start;
  }
  .tools-row {
    flex-wrap: wrap;
  }
  .tools-row input {
    flex: 1 1 100%;
  }
  .kanji-row {
    flex-wrap: wrap;
  }
  .kanji-row .card-actions {
    flex-basis: 100%;
  }
}

@media (max-width: 480px) {
  .app-header h1 {
    font-size: 1rem;
  }
  .deck-header h2 {
    font-size: 1.1rem;
  }
}

/* --- Error banner (errors.js) --- */
#errorBanner {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translate(-50%, 24px);
  width: min(680px, calc(100% - 32px));
  background: #2a1215;
  border: 1px solid #7f1d1d;
  color: #fecaca;
  border-radius: 14px;
  padding: 12px 14px;
  z-index: 3000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}
#errorBanner.show {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}
.error-banner-inner {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}
.error-banner-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.9rem;
  min-width: 0;
}
.error-banner-msg {
  overflow-wrap: anywhere;
}
.error-banner-details {
  font-size: 0.75rem;
  opacity: 0.8;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.error-banner-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}
.error-banner-actions button {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 0.85rem;
}
.error-banner-actions button:hover {
  background: rgba(255, 255, 255, 0.16);
}