*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

:root {
  --bg: #f5f5f4;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #78716c;
  --text-placeholder: #a8a29e;
  --border: #e7e5e4;
  --border-hover: #d6d3d1;
  --accent: #1a1a1a;
  --accent-text: #ffffff;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08);
  --transition: 150ms ease;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --column-width: 320px;
}

html.dark {
  --bg: #171717;
  --surface: #262626;
  --text: #e5e5e5;
  --text-secondary: #a3a3a3;
  --text-placeholder: #737373;
  --border: #333333;
  --border-hover: #444444;
  --accent: #e5e5e5;
  --accent-text: #171717;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4);
}

html, body {
  height: 100%;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ===== Sync Status ===== */
.sync-status {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: opacity 300ms ease;
}

.sync-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #a8a29e;
}

.sync-status.synced::before {
  background: #22c55e;
}

.sync-status.syncing::before {
  background: #f59e0b;
  animation: pulse 1s infinite;
}

.sync-status.offline::before {
  background: #a8a29e;
}

.sync-status.error::before {
  background: var(--danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 4px 8px;
}

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

.btn-danger {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all var(--transition);
}

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

/* ===== Theme Toggle ===== */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 6px;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.btn-icon:hover {
  color: var(--text);
  background: var(--bg);
}

/* ===== Sync Modal ===== */
.sync-modal {
  text-align: center;
}

/* ===== Board ===== */
.board {
  display: flex;
  gap: 16px;
  padding: 24px;
  overflow-x: auto;
  overflow-y: hidden;
  height: calc(100vh - 53px);
  align-items: flex-start;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

/* ===== Column ===== */
.column {
  flex: 0 0 var(--column-width);
  max-height: 100%;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  gap: 8px;
}

.column-title {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: none;
  border: none;
  outline: none;
  font-family: var(--font);
  padding: 2px 4px;
  margin: -2px -4px;
  border-radius: 4px;
  min-width: 0;
}

.column-title:focus {
  background: var(--bg);
}

.column-menu {
  position: relative;
  flex-shrink: 0;
}

.btn-menu {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 18px;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
  transition: all var(--transition);
  opacity: 0;
}

.column:hover .btn-menu {
  opacity: 1;
}

.btn-menu:hover {
  color: var(--text);
  background: var(--bg);
}

.column-menu-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  padding: 4px;
  z-index: 50;
}

.menu-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  font-size: 13px;
  font-family: var(--font);
  background: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text);
  transition: background var(--transition);
}

.menu-item:hover {
  background: var(--bg);
}

.menu-item-danger {
  color: var(--danger);
}

.menu-item-danger:hover {
  background: #fef2f2;
}

html.dark .menu-item-danger:hover {
  background: #3b1111;
}

.menu-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.column-notes {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.column-footer {
  padding: 8px;
  border-top: 1px solid var(--border);
}

.add-note-btn {
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-placeholder);
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font);
  transition: all var(--transition);
}

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

/* ===== Note ===== */
.note {
  position: relative;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 10px 12px;
  transition: box-shadow var(--transition);
}

.note:hover {
  box-shadow: var(--shadow);
}

.note-content {
  width: 100%;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: none;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font);
  overflow: hidden;
  min-height: 20px;
}

.note-actions {
  position: absolute;
  top: 6px;
  right: 6px;
  display: flex;
  align-items: center;
  gap: 2px;
  opacity: 0;
  transition: opacity var(--transition);
}

.note:hover .note-actions {
  opacity: 1;
}

.btn-move {
  background: transparent;
  color: var(--text-placeholder);
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 13px;
  padding: 2px 5px;
  border-radius: 4px;
  line-height: 1;
  transition: all var(--transition);
}

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

/* ===== Add Column ===== */
.add-column {
  flex: 0 0 var(--column-width);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  color: var(--text-placeholder);
  font-size: 14px;
  font-family: var(--font);
  transition: all var(--transition);
  scroll-snap-align: start;
}

.add-column:hover {
  border-color: var(--border-hover);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.5);
}

html.dark .add-column:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 24px;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  width: 100%;
  max-width: 400px;
  position: relative;
}

.modal h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.modal-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

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

#auth-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#auth-form input[type="email"] {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  font-family: var(--font);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition);
}

#auth-form input[type="email"]:focus {
  border-color: var(--accent);
}

.auth-message {
  font-size: 13px;
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: #f0fdf4;
  color: #166534;
}

.auth-message.error {
  background: #fef2f2;
  color: var(--danger);
}

html.dark .auth-message {
  background: #14332a;
  color: #4ade80;
}

html.dark .auth-message.error {
  background: #3b1111;
  color: #f87171;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --column-width: calc(100vw - 64px);
  }

  .header {
    padding: 12px 16px;
  }

  .board {
    padding: 16px;
    gap: 12px;
    scroll-snap-type: x mandatory;
  }

  .column {
    scroll-snap-align: center;
  }
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--accent-text);
  font-size: 13px;
  font-family: var(--font);
  padding: 8px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 300;
  transition: opacity 300ms ease;
}

/* ===== Column Type Badge ===== */
.column-type-badge {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-placeholder);
  flex-shrink: 0;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg);
}

.column-type-badge:empty {
  display: none;
}

/* ===== Add Column Type Picker ===== */
.add-column-wrapper {
  position: relative;
  flex: 0 0 var(--column-width);
  scroll-snap-align: start;
}

.type-picker-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.type-picker-option {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  font-family: var(--font);
  background: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition);
}

.type-picker-option:hover {
  background: var(--bg);
}

.type-picker-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.type-picker-desc {
  font-size: 12px;
  color: var(--text-secondary);
}

/* ===== Checklist ===== */
.checklist-items {
  gap: 2px !important;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius);
  transition: background var(--transition);
}

.checklist-item:hover {
  background: var(--bg);
}

.checklist-checkbox {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.checklist-text {
  flex: 1;
  font-size: 14px;
  font-family: var(--font);
  color: var(--text);
  background: none;
  border: none;
  outline: none;
  padding: 2px 0;
  min-width: 0;
}

.checklist-text.checked {
  text-decoration: line-through;
  color: var(--text-placeholder);
}

.checklist-delete {
  opacity: 0;
  flex-shrink: 0;
  font-size: 12px;
  padding: 2px 5px;
  transition: opacity var(--transition);
}

.checklist-item:hover .checklist-delete {
  opacity: 1;
}

.checklist-item.is-checked {
  opacity: 0.6;
}

/* ===== Feed Setup (RSS + ICS URL form) ===== */
.feed-setup {
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feed-setup-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.feed-url-row {
  display: flex;
  gap: 8px;
}

.feed-url-input {
  flex: 1;
  padding: 8px 12px;
  font-size: 13px;
  font-family: var(--font);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  background: var(--bg);
  color: var(--text);
  min-width: 0;
  transition: border-color var(--transition);
}

.feed-url-input:focus {
  border-color: var(--accent);
}

.feed-url-submit {
  flex-shrink: 0;
  padding: 8px 14px;
  font-size: 13px;
}

/* ===== Feed Items (RSS) ===== */
.feed-items {
  gap: 0 !important;
}

.feed-item {
  padding: 10px 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.feed-item:last-child {
  border-bottom: none;
}

.feed-item-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  line-height: 1.4;
}

a.feed-item-title:hover {
  text-decoration: underline;
}

.feed-item-meta {
  font-size: 11px;
  color: var(--text-placeholder);
}

.feed-item-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin: 0;
}

.feed-status {
  font-size: 13px;
  color: var(--text-placeholder);
  padding: 16px 10px;
  text-align: center;
}

.feed-updated {
  font-size: 11px;
  color: var(--text-placeholder);
  text-align: center;
  padding: 8px 0 4px;
}

/* ===== Calendar Events (ICS) ===== */
.calendar-events {
  gap: 0 !important;
}

.cal-date-header {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  padding: 12px 10px 4px;
  border-bottom: 1px solid var(--border);
}

.cal-date-header:first-child {
  padding-top: 6px;
}

.cal-event {
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-bottom: 1px solid var(--border);
}

.cal-event:last-child {
  border-bottom: none;
}

.cal-event-time {
  font-size: 11px;
  color: var(--text-placeholder);
  font-weight: 500;
}

.cal-event-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}

.cal-event-location {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 1px;
}

/* ===== Scrollbar ===== */
.column-notes::-webkit-scrollbar {
  width: 4px;
}

.column-notes::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.board::-webkit-scrollbar {
  height: 6px;
}

.board::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}