/* ============================================================
   Smart Productivity Planner — Main Stylesheet
   ============================================================ */

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

:root {
  --bg: #0a0a0f;
  --bg2: #111118;
  --bg3: #18181f;
  --bg4: #20202a;
  --border: #ffffff12;
  --border2: #ffffff20;
  --text: #e8e8f0;
  --text2: #9898a8;
  --text3: #5a5a6a;
  --accent: #6366f1;
  --accent2: #8b5cf6;
  --accent3: #06b6d4;
  --green: #10b981;
  --amber: #f59e0b;
  --red: #ef4444;
  --pink: #ec4899;
  --card-bg: #13131a;
  --card-border: #ffffff0f;
  font-family: 'DM Sans', sans-serif;
}

/* Light mode overrides */
.light {
  --bg: #f0f0f7;
  --bg2: #e8e8f2;
  --bg3: #ffffff;
  --bg4: #f8f8ff;
  --border: #00000012;
  --border2: #00000025;
  --text: #1a1a2e;
  --text2: #4a4a6a;
  --text3: #9898b8;
  --card-bg: #ffffff;
  --card-border: #0000000f;
}

body {
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.5;
}

h1, h2, h3 { font-weight: 600; line-height: 1.2; }
.mono { font-family: 'Space Mono', monospace; }

/* ── Layout ── */
.app { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: 220px;
  min-width: 220px;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: .3s;
}

.main { flex: 1; overflow-y: auto; background: var(--bg); }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  position: sticky;
  top: 0;
  z-index: 10;
}

.content { padding: 24px; max-width: 1400px; }

/* ── Sidebar ── */
.logo {
  padding: 20px 16px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.3px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.nav { padding: 12px 8px; flex: 1; overflow-y: auto; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text2);
  font-size: 13px;
  font-weight: 500;
  transition: .2s;
  margin-bottom: 2px;
}

.nav-item:hover { background: var(--bg4); color: var(--text); }

.nav-item.active {
  background: #6366f115;
  color: var(--accent);
  border-left: 2px solid var(--accent);
  padding-left: 10px;
}

.nav-icon { font-size: 15px; width: 20px; text-align: center; }

.nav-section {
  font-size: 10px;
  font-weight: 600;
  color: var(--text3);
  letter-spacing: .8px;
  padding: 12px 12px 4px;
  text-transform: uppercase;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: .2s;
  font-family: inherit;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent2); }
.btn-ghost { background: transparent; color: var(--text2); border: 1px solid var(--border2); }
.btn-ghost:hover { background: var(--bg4); color: var(--text); }
.btn-sm { padding: 5px 10px; font-size: 12px; border-radius: 6px; }
.btn-danger { background: #ef444420; color: var(--red); border: 1px solid #ef444440; }
.btn-success { background: #10b98120; color: var(--green); border: 1px solid #10b98140; }

/* ── Cards ── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 20px;
}

.card-sm { border-radius: 10px; padding: 14px; }

.metric-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  position: relative;
  overflow: hidden;
}

.metric-label {
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: .6px;
  margin-bottom: 8px;
  font-weight: 600;
}

.metric-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  font-family: 'Space Mono', monospace;
}

.metric-sub { font-size: 12px; color: var(--text3); margin-top: 4px; }
.metric-accent { position: absolute; right: 12px; top: 12px; font-size: 22px; opacity: .3; }

/* ── Grids ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ── Task Items ── */
.task-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 8px;
  transition: .2s;
  cursor: pointer;
}

.task-item:hover { border-color: var(--border2); background: var(--bg4); }
.task-item.completed { opacity: .6; }
.task-item.completed .task-title { text-decoration: line-through; color: var(--text3); }

.task-header { display: flex; align-items: flex-start; gap: 10px; }

.task-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border2);
  flex-shrink: 0;
  margin-top: 2px;
  cursor: pointer;
  transition: .2s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
}

.task-check.done { background: var(--green); border-color: var(--green); color: #fff; }
.task-title { font-size: 14px; font-weight: 500; color: var(--text); flex: 1; }

.task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding-left: 28px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}

.badge-high    { background: #ef444420; color: #ef4444; }
.badge-medium  { background: #f59e0b20; color: #f59e0b; }
.badge-low     { background: #10b98120; color: #10b981; }
.badge-tag     { background: #6366f115; color: var(--accent); }
.badge-overdue { background: #ef444430; color: #ef4444; }

.task-time { font-size: 11px; color: var(--text3); }

.progress-bar {
  height: 4px;
  background: var(--bg4);
  border-radius: 2px;
  margin-top: 8px;
  margin-left: 28px;
}

.progress-fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: .3s;
}

/* ── Forms ── */
.form-group { margin-bottom: 14px; }

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .5px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  transition: .2s;
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus { border-color: var(--accent); background: var(--bg4); }

.form-select { cursor: pointer; }
.form-textarea { resize: vertical; min-height: 70px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: #00000080;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 16px;
  padding: 24px;
  width: 500px;
  max-width: 95vw;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title { font-size: 17px; font-weight: 700; }

.close-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: .2s;
}

.close-btn:hover { background: var(--bg4); color: var(--text); }

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg3);
  border-radius: 10px;
  padding: 4px;
}

.tab {
  padding: 7px 16px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text2);
  transition: .2s;
  border: none;
  background: transparent;
  font-family: inherit;
}

.tab.active { background: var(--accent); color: #fff; }

/* ── Theme Toggle ── */
.toggle-theme {
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: var(--bg4);
  border: 1px solid var(--border2);
  cursor: pointer;
  position: relative;
  transition: .2s;
}

.toggle-theme::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text2);
  transition: .2s;
}

.light .toggle-theme::after { left: 18px; background: var(--accent); }

/* ── Chart containers ── */
.chart-wrap { position: relative; width: 100%; height: 220px; }
.chart-wrap-sm { height: 160px; }

/* ── Heatmap ── */
.heatmap { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; }

.hm-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  cursor: pointer;
  transition: .2s;
}

.hm-cell:hover { transform: scale(1.1); }

/* ── Streak badge ── */
.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, #f59e0b20, #ef444420);
  border: 1px solid #f59e0b40;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: #f59e0b;
}

/* ── Notification toast ── */
.notif {
  position: fixed;
  top: 16px;
  right: 16px;
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  z-index: 200;
  max-width: 300px;
  animation: slideIn .3s ease;
  box-shadow: 0 8px 32px #0006;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);   opacity: 1; }
}

/* ── Insight cards ── */
.insight-card {
  background: var(--bg3);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 12px 14px;
  margin-bottom: 8px;
}

.insight-card.warn    { border-left-color: var(--amber); }
.insight-card.danger  { border-left-color: var(--red); }
.insight-card.success { border-left-color: var(--green); }

.insight-title { font-size: 13px; font-weight: 600; margin-bottom: 3px; }
.insight-text  { font-size: 12px; color: var(--text2); }

/* ── Calendar ── */
.date-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-top: 8px; }

.date-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: .2s;
  border: 1px solid transparent;
  position: relative;
}

.date-cell:hover       { background: var(--bg4); border-color: var(--border2); }
.date-cell.today       { background: #6366f125; border-color: #6366f150; color: var(--accent); }
.date-cell.selected    { background: var(--accent); color: #fff; }
.date-cell.has-tasks::after {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--green);
  position: absolute;
  bottom: 3px;
  left: 50%;
  transform: translateX(-50%);
}
.date-cell.other-month { opacity: .3; }

/* ── Google Calendar banner ── */
.gcal-banner {
  background: linear-gradient(135deg, #1a73e820, #0f9d5820);
  border: 1px solid #1a73e830;
  border-radius: 10px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.gcal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #1a73e8;
  flex-shrink: 0;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .3; }
}

/* ── Misc ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title { font-size: 16px; font-weight: 700; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text3); }
.empty-icon  { font-size: 32px; margin-bottom: 8px; opacity: .4; }
.divider     { height: 1px; background: var(--border); margin: 20px 0; }

/* ── Scrollbar ── */
::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { width: 60px; min-width: 60px; }
  .nav-label, .logo-text, .nav-section { display: none; }
  .grid-4, .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}