/* ============================================
   FlowTrack - Styles CSS
   Design moderne, mobile-first
   ============================================ */

:root {
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --primary-light: #e0f2fe;
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --sidebar-w: 256px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.1);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }

/* ---- Layout ---- */
.app-layout { display: flex; min-height: 100vh; }

.app-layout.sidebar-collapsed .main-content {
  margin-left: 0;
}

.sidebar {
  width: var(--sidebar-w);
  background: var(--gray-900);
  color: #fff;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  transition: transform .3s;
}

.sidebar.closed { transform: translateX(-100%); }
.sidebar.closed-desktop { transform: translateX(-100%); }

.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  padding: 24px;
  max-width: 1200px;
}

@media (max-width: 1023px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar.closed-desktop { transform: translateX(-100%); }
  .main-content { margin-left: 0; padding: 16px; padding-top: 64px; }
}

/* ---- Sidebar ---- */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.sidebar-logo .logo-icon {
  width: 32px; height: 32px;
  background: var(--primary);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}

.sidebar-logo span { font-weight: 700; font-size: 18px; letter-spacing: -.02em; }

.sidebar-nav { flex: 1; padding: 16px 12px; }

.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  font-size: 14px; font-weight: 500;
  color: rgba(255,255,255,.6);
  cursor: pointer; transition: all .15s;
  border: none; background: none; width: 100%; text-align: left;
}

.nav-item:hover { background: rgba(255,255,255,.08); color: #fff; }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-user {
  padding: 16px 12px;
  border-top: 1px solid rgba(255,255,255,.1);
}

.user-info {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; margin-bottom: 4px;
}

.user-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; flex-shrink: 0;
}

.user-name { font-size: 14px; font-weight: 500; }
.user-role { font-size: 11px; color: #fbbf24; display: flex; align-items: center; gap: 4px; }

.btn-logout {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  font-size: 14px; font-weight: 500;
  color: rgba(255,255,255,.6); cursor: pointer;
  border: none; background: none; width: 100%; text-align: left;
  transition: all .15s;
}
.btn-logout:hover { background: rgba(255,255,255,.08); color: #fff; }

/* ---- Hamburger ---- */
.hamburger {
  position: fixed; top: 16px; left: 16px; z-index: 20;
  background: var(--gray-900); color: #fff;
  border: none; border-radius: 10px; padding: 8px;
  cursor: pointer; display: flex;
  box-shadow: var(--shadow-md);
}

.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.5);
  z-index: 25; display: none;
}
.overlay.show { display: block; }

/* ---- Page Header ---- */
.page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}

.page-header h1 { font-size: 24px; font-weight: 700; color: var(--gray-900); }
.page-header p { font-size: 14px; color: var(--gray-500); margin-top: 2px; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: var(--radius);
  font-size: 14px; font-weight: 600; border: none;
  cursor: pointer; transition: all .15s;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 2px 8px rgba(14,165,233,.25); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-200); }
.btn-danger { background: var(--danger-light); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: 8px; }
.btn-icon {
  width: 32px; height: 32px; padding: 0;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 8px; border: none; cursor: pointer;
  background: transparent; color: var(--gray-400);
  transition: all .15s;
}
.btn-icon:hover { background: var(--gray-100); color: var(--gray-600); }
.btn-icon.danger:hover { background: var(--danger-light); color: var(--danger); }

/* ---- Cards ---- */
.card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg); padding: 20px;
  box-shadow: var(--shadow);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px; margin-bottom: 24px;
}

.stat-card {
  border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 12px; text-align: center;
}
.stat-card .value { font-size: 24px; font-weight: 700; }
.stat-card .label { font-size: 11px; font-weight: 500; margin-top: 2px; }

/* ---- Filters ---- */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px;
}

.search-input {
  position: relative; flex: 1; min-width: 180px;
}
.search-input input {
  width: 100%; padding: 8px 12px 8px 36px;
  border: 1px solid var(--gray-200); border-radius: var(--radius);
  font-size: 14px; outline: none; transition: border-color .15s;
}
.search-input input:focus { border-color: var(--primary); }
.search-input svg {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 15px; height: 15px; color: var(--gray-400);
}

.filter-pills {
  display: flex; background: var(--gray-100); border-radius: var(--radius);
  padding: 4px; gap: 2px; flex-wrap: wrap;
}
.filter-pill {
  padding: 6px 12px; border-radius: 8px; font-size: 12px;
  font-weight: 500; border: none; cursor: pointer;
  background: transparent; color: var(--gray-500);
  transition: all .15s;
}
.filter-pill:hover { color: var(--gray-700); }
.filter-pill.active { background: #fff; color: var(--gray-900); box-shadow: var(--shadow); }

/* ---- Task List ---- */
.task-list { display: flex; flex-direction: column; gap: 8px; }

.task-item {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg); padding: 16px;
  box-shadow: var(--shadow); transition: box-shadow .15s;
}
.task-item:hover { box-shadow: var(--shadow-md); }
.task-item.overdue { border-color: #fca5a5; background: rgba(254,242,242,.5); }
.task-item.archived { opacity: .6; }

.task-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }

.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 20px;
  font-size: 11px; font-weight: 600;
}
.badge-todo { background: var(--gray-100); color: var(--gray-700); }
.badge-in_progress { background: var(--warning-light); color: #b45309; }
.badge-done { background: var(--success-light); color: #047857; }
.badge-low { background: var(--primary-light); color: #0369a1; }
.badge-medium { background: #fff7ed; color: #c2410c; }
.badge-high { background: var(--danger-light); color: #b91c1c; }
.badge-overdue { background: var(--danger-light); color: var(--danger); }

.task-title { font-size: 15px; font-weight: 600; color: var(--gray-900); }
.task-title.done { text-decoration: line-through; color: var(--gray-400); }
.task-desc { font-size: 12px; color: var(--gray-500); margin-top: 2px; }
.task-due { font-size: 12px; color: var(--gray-400); margin-top: 6px; display: flex; align-items: center; gap: 4px; }
.task-due.overdue { color: var(--danger); }

.task-actions {
  display: flex; gap: 4px; opacity: 0; transition: opacity .15s;
}
.task-item:hover .task-actions { opacity: 1; }

@media (max-width: 640px) {
  .task-actions { opacity: 1; }
}

/* ---- Habit Cards ---- */
.habit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.habit-card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg); padding: 16px;
  box-shadow: var(--shadow); transition: box-shadow .15s;
}
.habit-card:hover { box-shadow: var(--shadow-md); }

.habit-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 12px; }
.habit-info { display: flex; align-items: center; gap: 10px; }

.habit-emoji {
  width: 40px; height: 40px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}

.habit-name { font-size: 15px; font-weight: 600; color: var(--gray-900); }
.habit-desc { font-size: 12px; color: var(--gray-400); }

.habit-stats { display: flex; align-items: center; gap: 16px; margin-bottom: 12px; }
.habit-stat { text-align: center; }
.habit-stat .value { font-size: 14px; font-weight: 700; }
.habit-stat .label { font-size: 11px; color: var(--gray-400); }

.streak-value { color: #f97316; display: flex; align-items: center; gap: 4px; }

.progress-bar { width: 100%; height: 6px; background: var(--gray-100); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 3px; transition: width .3s; }

.btn-today {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: var(--radius);
  font-size: 12px; font-weight: 600; border: none;
  cursor: pointer; transition: all .15s;
}
.btn-today.done { color: #fff; }
.btn-today.not-done { background: var(--gray-100); color: var(--gray-600); }
.btn-today.not-done:hover { background: var(--gray-200); }

/* ---- Calendar ---- */
.calendar-table {
  width: 100%; border-collapse: collapse; min-width: 560px;
}
.calendar-table th {
  padding: 12px 8px; font-size: 11px; font-weight: 500;
  color: var(--gray-500); text-align: center;
}
.calendar-table th .day-num { font-size: 14px; font-weight: 700; color: var(--gray-800); margin-top: 2px; }
.calendar-table th .day-num.today { color: var(--primary); }
.calendar-table td { padding: 8px 4px; text-align: center; }
.calendar-table tr { border-top: 1px solid var(--gray-100); }
.calendar-table tr:hover { background: rgba(0,0,0,.01); }

.cal-check {
  width: 28px; height: 28px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  border: none; cursor: pointer; transition: all .15s;
  font-size: 13px;
}
.cal-check.empty { background: var(--gray-100); }
.cal-check.empty:hover { background: var(--gray-200); }
.cal-check.future { background: var(--gray-50); opacity: .3; cursor: not-allowed; }
.cal-check.checked { color: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.1); }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 50;
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
}
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.5); backdrop-filter: blur(4px);
}
.modal-content {
  position: relative; background: #fff;
  border-radius: var(--radius-lg); box-shadow: 0 20px 60px rgba(0,0,0,.2);
  width: 100%; max-width: 480px; max-height: 90vh; overflow-y: auto;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; border-bottom: 1px solid var(--gray-100);
}
.modal-header h2 { font-size: 17px; font-weight: 600; }
.modal-body { padding: 24px; }

/* ---- Form ---- */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 14px; font-weight: 500; color: var(--gray-700); margin-bottom: 6px; }
.form-input {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--gray-200); border-radius: var(--radius);
  font-size: 14px; outline: none; transition: border-color .15s;
  font-family: inherit;
}
.form-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(14,165,233,.1); }
textarea.form-input { resize: vertical; min-height: 60px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.emoji-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.emoji-btn {
  width: 36px; height: 36px; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px; border: 2px solid var(--gray-100);
  cursor: pointer; transition: all .15s; background: none;
}
.emoji-btn:hover { border-color: var(--gray-300); }
.emoji-btn.selected { border-color: var(--primary); background: var(--primary-light); }

.color-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.color-btn {
  width: 32px; height: 32px; border-radius: 50%;
  border: 2px solid transparent; cursor: pointer;
  transition: all .15s;
}
.color-btn:hover { transform: scale(1.1); }
.color-btn.selected { border-color: var(--gray-800); transform: scale(1.15); }

/* ---- Auth Page ---- */
.auth-page {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 50%, #0c4a6e 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
}

.auth-card {
  width: 100%; max-width: 400px;
}

.auth-logo { text-align: center; margin-bottom: 32px; }
.auth-logo .icon {
  width: 56px; height: 56px; background: var(--primary);
  border-radius: 16px; display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 28px; margin-bottom: 16px;
  box-shadow: 0 8px 24px rgba(14,165,233,.3);
}
.auth-logo h1 { font-size: 28px; font-weight: 700; color: #fff; letter-spacing: -.02em; }
.auth-logo p { font-size: 14px; color: var(--gray-400); margin-top: 6px; }

.auth-form {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg); padding: 32px;
  backdrop-filter: blur(12px);
}

.auth-tabs {
  display: flex; background: rgba(255,255,255,.06);
  border-radius: var(--radius); padding: 4px; margin-bottom: 24px;
}
.auth-tab {
  flex: 1; padding: 8px; border-radius: 8px;
  font-size: 14px; font-weight: 500; border: none;
  cursor: pointer; transition: all .15s;
  background: transparent; color: var(--gray-400);
}
.auth-tab.active { background: var(--primary); color: #fff; box-shadow: var(--shadow); }

.auth-field { margin-bottom: 16px; }
.auth-field label { display: block; font-size: 14px; font-weight: 500; color: var(--gray-300); margin-bottom: 6px; }
.auth-field input {
  width: 100%; padding: 12px 14px;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius); color: #fff; font-size: 14px;
  outline: none; transition: border-color .15s;
}
.auth-field input::placeholder { color: var(--gray-500); }
.auth-field input:focus { border-color: var(--primary); }

.auth-error {
  background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3);
  color: #fca5a5; font-size: 13px; border-radius: var(--radius);
  padding: 12px; margin-bottom: 16px;
}

.auth-submit {
  width: 100%; padding: 12px;
  background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: background .15s;
  box-shadow: 0 4px 12px rgba(14,165,233,.2);
}
.auth-submit:hover { background: var(--primary-hover); }
.auth-submit:disabled { opacity: .5; cursor: not-allowed; }

/* ---- Dashboard ---- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px; margin-bottom: 24px;
}

.kpi-card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg); padding: 16px;
  box-shadow: var(--shadow);
}
.kpi-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.kpi-icon {
  width: 36px; height: 36px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.kpi-value { font-size: 24px; font-weight: 700; color: var(--gray-900); }
.kpi-label { font-size: 14px; font-weight: 600; color: var(--gray-700); }
.kpi-sub { font-size: 12px; color: var(--gray-400); margin-top: 2px; }

.donut-chart { display: flex; align-items: center; gap: 16px; }
.donut-legend { display: flex; flex-direction: column; gap: 8px; }
.legend-item { display: flex; align-items: center; gap: 8px; font-size: 12px; }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.legend-label { color: var(--gray-600); flex: 1; }
.legend-value { font-weight: 700; color: var(--gray-800); }

.bar-chart { display: flex; align-items: flex-end; gap: 8px; height: 96px; }
.bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.bar-value { font-size: 12px; font-weight: 700; color: var(--gray-600); }
.bar-fill { width: 100%; border-radius: 6px 6px 0 0; transition: height .3s; min-height: 0; }
.bar-label { font-size: 11px; color: var(--gray-400); }

.quick-list { display: flex; flex-direction: column; gap: 8px; }
.quick-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px; background: var(--gray-50); border-radius: var(--radius);
}
.quick-item .dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.quick-item .title { font-size: 14px; font-weight: 600; color: var(--gray-800); }
.quick-item .sub { font-size: 12px; color: var(--gray-400); }

/* ---- Skeleton ---- */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ---- Empty State ---- */
.empty-state { text-align: center; padding: 64px 16px; color: var(--gray-400); }
.empty-state svg { margin: 0 auto 12px; opacity: .3; }
.empty-state p { font-weight: 500; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }