:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-soft: #eef2ff;
  --text: #111827;
  --muted: #667085;
  --border: #d9e0ef;
  --brand: #6366f1;
  --brand-strong: #4f46e5;
  --good: #16a34a;
  --warn: #f59e0b;
  --danger: #dc2626;
  --shadow: 0 24px 70px rgba(15, 23, 42, .12);
  --ring: rgba(99,102,241,.18);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #121a2e;
  --panel-soft: #1b2440;
  --text: #f8fafc;
  --muted: #aab4c5;
  --border: #26334d;
  --brand: #818cf8;
  --brand-strong: #6366f1;
  --shadow: 0 20px 50px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(99,102,241,.22), transparent 28rem), radial-gradient(circle at bottom right, rgba(20,184,166,.14), transparent 26rem), var(--bg);
  color: var(--text);
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.app-shell { min-height: 100vh; }
.auth-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-card {
  width: min(500px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 30px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.logo-row, .topbar, .project-row, .task-row, .toolbar, .view-tabs, .theme-row, .auth-tabs, .status-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.premium-card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 5px; background: linear-gradient(90deg, var(--brand), #ec4899, #14b8a6); }
.logo {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--brand), #ec4899);
  color: white;
  font-size: 24px;
}
h1, h2, h3 { margin: 0; }
p { color: var(--muted); line-height: 1.5; }
label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; font-weight: 700; }
input, select, textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(99,102,241,.18); }
.form-grid { display: grid; gap: 14px; margin-top: 20px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  padding: 10px 14px;
  font-weight: 800;
}
.btn.primary { background: var(--brand); border-color: var(--brand); color: white; }
.btn.primary:hover { background: var(--brand-strong); transform: translateY(-1px); }
.btn:hover { border-color: var(--brand); }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--danger); }
.btn.small { padding: 7px 10px; font-size: 13px; }
.btn.full { width: 100%; justify-content: center; margin-top: 10px; }
.auth-tabs { margin-top: 20px; padding: 4px; background: var(--panel-soft); border-radius: 16px; }
.auth-tabs .btn { flex: 1; border: 0; }
.auth-tabs .active { background: var(--panel); box-shadow: 0 2px 10px rgba(0,0,0,.08); }
.error { color: var(--danger); font-weight: 700; padding: 10px 12px; background: rgba(220,38,38,.10); border-radius: 12px; }
.success { color: var(--good); font-weight: 700; padding: 10px 12px; background: rgba(22,163,74,.10); border-radius: 12px; }
.reset-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 100vh;
}
.sidebar {
  padding: 22px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--border);
  background: rgba(255,255,255,.55);
  backdrop-filter: blur(16px);
}
[data-theme="dark"] .sidebar { background: rgba(18,26,46,.78); }
.main { padding: 26px; min-width: 0; }
.topbar { justify-content: space-between; margin-bottom: 18px; flex-wrap: wrap; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.panel-pad { padding: 18px; }
.project-list { display: grid; gap: 8px; margin: 18px 0; }
.project-row {
  width: 100%;
  justify-content: space-between;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 16px;
  padding: 10px;
  text-align: left;
}
.project-row.active { border-color: var(--brand); background: var(--panel-soft); }
.project-name { display: flex; align-items: center; gap: 8px; min-width: 0; }
.project-name span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge { border-radius: 999px; background: var(--panel-soft); padding: 4px 8px; color: var(--muted); font-size: 12px; font-weight: 800; }
.toolbar { justify-content: space-between; flex-wrap: wrap; margin-bottom: 16px; }
.view-tabs { flex-wrap: wrap; padding: 4px; background: var(--panel-soft); border-radius: 16px; }
.view-tabs .btn { border: 0; }
.view-tabs .active { background: var(--panel); color: var(--brand); }
.task-form { display: grid; grid-template-columns: minmax(180px,1fr) auto; gap: 10px; margin-bottom: 12px; }
.task-more { grid-column: 1 / -1; border: 1px solid var(--border); border-radius: 16px; padding: 10px 12px; background: var(--panel); }
.task-more summary { cursor: pointer; font-weight: 850; color: var(--brand); min-height: 28px; }
.task-more-grid { display: grid; grid-template-columns: repeat(4, minmax(120px, 1fr)); gap: 10px; margin-top: 10px; }
.quick-row, .filter-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.filter-more { margin-bottom: 12px; border: 1px solid var(--border); border-radius: 16px; padding: 10px 12px; background: var(--panel); }
.filter-more summary { cursor: pointer; font-weight: 850; color: var(--brand); min-height: 28px; }
.filter-more .quick-row { margin-top: 10px; }
.filter-more .filter-row { margin-bottom: 0; }
.filter-row input { flex: 1 1 260px; }
.filter-row select { width: auto; min-width: 150px; }
.task-list { display: grid; gap: 10px; }
.task-row {
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
}
.task-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.task-row[draggable="true"] { cursor: grab; }
.task-row.dragging { opacity: .55; transform: rotate(.4deg); }
.task-title { font-weight: 850; }
.task-meta { color: var(--muted); font-size: 13px; margin-top: 4px; }
.priority { display: inline-flex; align-items: center; border-radius: 999px; padding: 2px 7px; font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: .02em; }
.priority.high { background: rgba(220,38,38,.14); color: #ef4444; }
.priority.medium { background: rgba(245,158,11,.16); color: #d97706; }
.priority.low { background: rgba(22,163,74,.14); color: #16a34a; }
.task-left { display: flex; gap: 12px; align-items: flex-start; min-width: 0; }
.task-left input { width: auto; margin-top: 4px; }
.task-done .task-title { text-decoration: line-through; color: var(--muted); }
.board { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.column { padding: 12px; border-radius: 20px; background: var(--panel-soft); min-height: 240px; border: 1px solid transparent; transition: .16s ease; }
.column.drag-over { border-color: var(--brand); box-shadow: 0 0 0 4px var(--ring); }
.empty-mini { color: var(--muted); font-size: 13px; }
.column h3 { margin-bottom: 10px; font-size: 15px; }
.calendar, .timeline { display: grid; gap: 10px; }
.calendar-day, .timeline-item { padding: 14px; border: 1px solid var(--border); border-radius: 18px; background: var(--panel); }
.theme-row { flex-wrap: wrap; margin-top: 16px; }
.theme-pill { display: inline-flex; gap: 7px; align-items: center; padding: 8px 10px; border: 1px solid var(--border); border-radius: 999px; }
.theme-pill input { width: auto; }
.status-row { justify-content: space-between; color: var(--muted); font-size: 13px; flex-wrap: wrap; margin-top: 16px; }
.empty { padding: 36px; text-align: center; color: var(--muted); }
.mobile-project-toggle { display: none; }
.utility-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
.template-box { display: grid; gap: 8px; margin-top: 12px; padding: 12px; border: 1px solid var(--border); border-radius: 18px; background: var(--panel-soft); }
.help { margin-top: 18px; color: var(--muted); font-size: 13px; }

@media (max-width: 1120px) {
  .task-more-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 0; z-index: 4; height: auto; max-height: 80vh; border-right: 0; border-bottom: 1px solid var(--border); padding: 14px; }
  .main { padding: 14px; }
  .mobile-project-toggle { display: inline-flex; }
  .projects-collapsed .project-list, .projects-collapsed .new-project-form, .projects-collapsed .utility-grid, .projects-collapsed .template-box, .projects-collapsed .example-action, .projects-collapsed .theme-row, .projects-collapsed .help { display: none; }
  .task-form { grid-template-columns: 1fr auto; }
  .task-more-grid { grid-template-columns: 1fr; }
  .task-more { padding: 8px 10px; }
  .btn, input, select { min-height: 44px; }
  .quick-row .btn, .view-tabs .btn { min-height: 44px; }
  .filter-row select { width: 100%; }
  .board { grid-template-columns: 1fr; }
  .topbar { align-items: flex-start; }
  .toolbar { align-items: stretch; }
  .view-tabs { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .task-row { align-items: flex-start; }
  .task-row .task-actions { display: grid; gap: 6px; }
}

@media (max-width: 520px) {
  .auth-wrap { padding: 14px; }
  .auth-card, .panel-pad { padding: 16px; border-radius: 20px; }
  .main { padding: 12px; }
  .task-actions { width: 100%; }
  .task-actions select, .task-actions button { width: 100%; }
}