/* ─── Login screen ──────────────────────────────────────────────────────── */
.login-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 1rem;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  padding: 2.5rem 2rem 2rem;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
  animation: scaleIn .2s ease both;
}

.login-logo {
  display: flex;
  align-items: center;
  gap: .625rem;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.3px;
  margin-bottom: .5rem;
}

.login-heading {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -.4px;
  color: var(--text);
  margin: 0;
}

.login-sub {
  font-size: .9rem;
  color: var(--text-secondary);
  text-align: center;
  margin: 0 0 .75rem;
}

#google-signin-btn {
  display: flex;
  justify-content: center;
  width: 100%;
}

.login-footer-note {
  font-size: .75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: .5rem;
}

/* ─── Reset & tokens ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:       #6366f1;
  --primary-dark:  #4f46e5;
  --primary-light: #e0e7ff;
  --danger:        #ef4444;
  --danger-dark:   #dc2626;
  --success:       #22c55e;
  --success-light: #dcfce7;
  --warning:       #f59e0b;
  --warning-light: #fef3c7;

  --bg:            #f8fafc;
  --surface:       #ffffff;
  --surface-2:     #f1f5f9;
  --border:        #e2e8f0;
  --border-focus:  #6366f1;

  --text:          #0f172a;
  --text-secondary:#64748b;
  --text-muted:    #94a3b8;

  --sidebar-w:     260px;
  --radius:        12px;
  --radius-sm:     8px;
  --shadow:        0 1px 3px rgba(0,0,0,.07), 0 4px 12px rgba(0,0,0,.05);
  --shadow-lg:     0 10px 40px rgba(0,0,0,.14);
  --transition:    0.18s ease;

  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ─── Layout ────────────────────────────────────────────────────────────── */
.app {
  display: flex;
  min-height: 100dvh;
}

/* ─── Sidebar ───────────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: .625rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.3px;
}

.sidebar-nav {
  flex: 1;
  padding: .75rem .75rem 0;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: .625rem;
  padding: .625rem .75rem;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: background var(--transition), color var(--transition);
}

.nav-item:hover {
  background: var(--surface-2);
  color: var(--text);
}

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-item svg { flex-shrink: 0; }

.badge {
  margin-left: auto;
  background: var(--surface-2);
  color: var(--text-secondary);
  border-radius: 20px;
  padding: .125rem .5rem;
  font-size: .75rem;
  font-weight: 600;
  min-width: 1.4rem;
  text-align: center;
}

.badge-green { background: var(--success-light); color: #15803d; }

.sidebar-footer {
  padding: 1rem 1.25rem 1.5rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.stats {
  display: flex;
  gap: 1rem;
  margin-bottom: .875rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
}

.stat-num {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-label {
  font-size: .7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-top: .25rem;
}

.progress-bar-wrap { display: flex; flex-direction: column; gap: .375rem; }

.progress-bar {
  height: 6px;
  background: var(--surface-2);
  border-radius: 99px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #818cf8);
  border-radius: 99px;
  transition: width .4s ease;
  width: 0%;
}

.progress-label { font-size: .72rem; color: var(--text-muted); }

/* ─── Main ──────────────────────────────────────────────────────────────── */
.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ─── Topbar ────────────────────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248,250,252,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: .875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.topbar-left { display: flex; align-items: center; gap: .75rem; flex: 1; }

.topbar-right {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-shrink: 0;
}

/* ─── User info (topbar) ─────────────────────────────────────────────────── */
.user-info {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  flex-shrink: 0;
}

.user-name {
  font-size: .8125rem;
  font-weight: 500;
  color: var(--text);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-sm {
  padding: .35rem .75rem;
  font-size: .8rem;
}

.menu-toggle {
  display: none;
  border: none;
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: .25rem;
  border-radius: var(--radius-sm);
}

.menu-toggle:hover { background: var(--surface-2); }

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 360px;
}

.search-wrap svg {
  position: absolute;
  left: .75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: .5rem .75rem .5rem 2.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

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

/* ─── Buttons ───────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), transform .1s;
  flex-shrink: 0;
}

.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:active { transform: scale(.97); }

.btn-ghost {
  padding: .55rem 1rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  font-family: var(--font);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.btn-ghost:hover { background: var(--surface-2); color: var(--text); }

.btn-danger {
  padding: .55rem 1rem;
  background: var(--danger);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--transition);
}

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

/* ─── Content ───────────────────────────────────────────────────────────── */
.content {
  flex: 1;
  padding: 1.75rem 1.5rem 3rem;
  max-width: 860px;
  width: 100%;
}

.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: 1rem;
}

.content-header h1 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -.3px;
}

.sort-wrap {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .8rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.sort-select {
  padding: .35rem .6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .8rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
}

.sort-select:focus { outline: none; border-color: var(--border-focus); }

/* ─── Task list ─────────────────────────────────────────────────────────── */
.task-list {
  display: flex;
  flex-direction: column;
  gap: .625rem;
}

/* ─── Task card ─────────────────────────────────────────────────────────── */
.task-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.125rem;
  display: flex;
  align-items: flex-start;
  gap: .875rem;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  animation: slideIn .2s ease both;
  position: relative;
}

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

.task-card:hover {
  box-shadow: var(--shadow);
  border-color: #cbd5e1;
}

.task-card.completed { opacity: .65; }
.task-card.completed .task-title { text-decoration: line-through; color: var(--text-muted); }

/* overdue highlight */
.task-card.overdue { border-left: 3px solid var(--danger); }

/* checkbox */
.task-check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
  transition: border-color var(--transition), background var(--transition);
  background: none;
}

.task-check:hover { border-color: var(--primary); background: var(--primary-light); }

.task-card.completed .task-check {
  background: var(--success);
  border-color: var(--success);
}

.task-check svg { display: none; }
.task-card.completed .task-check svg { display: block; }

/* task body */
.task-body { flex: 1; min-width: 0; }

.task-title {
  font-size: .9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: .375rem;
  line-height: 1.4;
  word-break: break-word;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .75rem;
  font-size: .78rem;
  color: var(--text-secondary);
}

.task-meta-item {
  display: flex;
  align-items: center;
  gap: .3rem;
}

.task-meta-item svg { flex-shrink: 0; }

.task-notes {
  margin-top: .5rem;
  font-size: .8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  border-top: 1px solid var(--border);
  padding-top: .5rem;
}

/* task actions */
.task-actions {
  display: flex;
  gap: .25rem;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--transition);
}

.task-card:hover .task-actions,
.task-card:focus-within .task-actions {
  opacity: 1;
}

.task-action-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}

.task-action-btn:hover { background: var(--surface-2); color: var(--text); }
.task-action-btn.delete:hover { background: #fee2e2; color: var(--danger); }

/* ─── Empty state ───────────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 5rem 1rem;
  gap: .75rem;
  text-align: center;
}

.empty-title { font-size: 1.125rem; font-weight: 600; color: var(--text-secondary); }
.empty-sub { font-size: .875rem; color: var(--text-muted); }

/* ─── Modal ─────────────────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn .15s ease both;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90dvh;
  overflow-y: auto;
  animation: scaleIn .18s ease both;
}

.modal-sm { max-width: 380px; }

@keyframes scaleIn {
  from { opacity: 0; transform: scale(.95) translateY(-8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface);
  border-radius: var(--radius) var(--radius) 0 0;
}

.modal-header h2 { font-size: 1.0625rem; font-weight: 700; }

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.modal-close:hover { background: var(--surface-2); color: var(--text); }

.modal-body { padding: 1.5rem; }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: .625rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  margin-top: 1.25rem;
}

/* ─── Form ──────────────────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: .375rem;
  margin-bottom: 1.125rem;
}

.form-group:last-child { margin-bottom: 0; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .875rem;
  margin-bottom: 1.125rem;
}

label {
  font-size: .8125rem;
  font-weight: 600;
  color: var(--text);
}

.required { color: var(--primary); }

.form-control {
  padding: .6rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

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

textarea.form-control { resize: vertical; min-height: 80px; }

.input-icon-wrap { position: relative; }
.input-icon-wrap svg {
  position: absolute;
  left: .75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}
.form-control.has-icon { padding-left: 2.25rem; }

.field-error { font-size: .75rem; color: var(--danger); min-height: 1rem; }
.form-control.error { border-color: var(--danger); }

/* ─── Toast ─────────────────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  z-index: 300;
}

.toast {
  background: var(--text);
  color: #fff;
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toastIn .2s ease both;
  max-width: 300px;
}

.toast.success { background: #15803d; }
.toast.error   { background: var(--danger-dark); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(20px); }
}

/* ─── Sidebar overlay (mobile) ──────────────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,.4);
  z-index: 90;
}

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  :root { --sidebar-w: 260px; }

  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .sidebar-overlay.open { display: block; }

  .menu-toggle { display: flex; }

  .main { margin-left: 0; }

  .content { padding: 1.25rem 1rem 3rem; }

  .form-row { grid-template-columns: 1fr; }

  .task-actions { opacity: 1; }

  .topbar { padding: .75rem 1rem; }

  .search-wrap { max-width: none; }

  .btn-primary span { display: none; }
}

@media (max-width: 480px) {
  .content-header { flex-direction: column; align-items: flex-start; }
  .sort-wrap { width: 100%; }
  .sort-select { flex: 1; }
}