/* ═══════════════════════════════════════════════════════════════════
   TIMESHEET APP — Modern Light Mode Design System
   Pristine, crisp, high-end SaaS aesthetic with subtle glassmorphism
   ═══════════════════════════════════════════════════════════════════ */

/* ─── CSS Custom Properties (Light Mode Palette) ─────────────────── */
:root {
  /* Surfaces & Canvas */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #fafafa;
  --bg-elevated: #ffffff;
  --bg-input: #ffffff;
  --bg-input-focus: #ffffff;

  /* Borders & Glass */
  --border-light: #e2e8f0;
  --border-subtle: #f1f5f9;
  --border-focus: #6366f1;
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(226, 232, 240, 0.8);
  --glass-blur: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-card: 0 1px 3px 0 rgba(15, 23, 42, 0.05), 0 10px 25px -5px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 30px -10px rgba(15, 23, 42, 0.08), 0 20px 40px -15px rgba(15, 23, 42, 0.05);
  --shadow-modal: 0 25px 50px -12px rgba(15, 23, 42, 0.18);

  /* Typography */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-white: #ffffff;

  /* Primary Brand Accent (Modern Indigo) */
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: #eef2ff;
  --accent-glow: rgba(79, 70, 229, 0.15);
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #6366f1 50%, #8b5cf6 100%);

  /* Status Colors */
  --color-active: #0ea5e9;
  --color-active-bg: #f0f9ff;
  --color-active-border: #bae6fd;

  --color-unbilled: #d97706;
  --color-unbilled-bg: #fffbeb;
  --color-unbilled-border: #fde68a;

  --color-invoiced: #6366f1;
  --color-invoiced-bg: #eef2ff;
  --color-invoiced-border: #c7d2fe;

  --color-paid: #059669;
  --color-paid-bg: #ecfdf5;
  --color-paid-border: #a7f3d0;

  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;

  /* Layout dimensions */
  --sidebar-width: 270px;
  --header-height: 64px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle ambient backdrop mesh */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 800px 500px at 15% 10%, rgba(79, 70, 229, 0.04), transparent),
    radial-gradient(ellipse 600px 450px at 85% 85%, rgba(16, 185, 129, 0.03), transparent),
    radial-gradient(ellipse 500px 350px at 50% 50%, rgba(14, 165, 233, 0.02), transparent);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* ─── Layout ───────────────────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* ─── Sidebar ──────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background: #ffffff;
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  box-shadow: 1px 0 3px rgba(0, 0, 0, 0.02);
  transition: transform var(--transition-base);
}

.sidebar-header {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-logo-icon {
  width: 42px;
  height: 42px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px var(--accent-glow);
  flex-shrink: 0;
}

.sidebar-logo-icon svg {
  width: 22px;
  height: 22px;
}

.sidebar-logo-text {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.sidebar-logo-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.sidebar-nav {
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10%;
  bottom: 10%;
  width: 3px;
  background: var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-icon svg {
  width: 18px;
  height: 18px;
}

.nav-badge {
  margin-left: auto;
  background: #fef3c7;
  color: #b45309;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  border: 1px solid #fde68a;
}

/* Sidebar User Footer */
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-subtle);
  background: #ffffff;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
}

.user-avatar-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-light);
  flex-shrink: 0;
}

.user-avatar-icon svg {
  width: 18px;
  height: 18px;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: 11px;
  color: var(--text-muted);
}

.user-logout-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.user-logout-btn:hover {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.user-logout-btn svg {
  width: 16px;
  height: 16px;
}

/* ─── Main Content ─────────────────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 32px 40px;
  max-width: 1280px;
  min-height: 100vh;
}

.page {
  display: none;
  animation: fadeIn 200ms ease-out;
}

.page.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-muted);
}

/* ─── Cards ────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  border-color: #cbd5e1;
}

.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  padding: 24px;
}

/* ─── Welcome Banner ───────────────────────────────────────────────── */
.welcome-banner {
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.welcome-text h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.welcome-text p {
  font-size: 14px;
  color: var(--text-muted);
}

.welcome-progress {
  min-width: 260px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 6px;
}

.progress-bar-bg {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 500ms ease;
}

/* ─── Stats Grid ───────────────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: all var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.stat-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  color: var(--accent);
}

.stat-icon svg {
  width: 18px;
  height: 18px;
}

.stat-icon.icon-amber {
  background: #fffbeb;
  color: #d97706;
}

.stat-icon.icon-green {
  background: #ecfdf5;
  color: #059669;
}

.stat-icon.icon-blue {
  background: #f0f9ff;
  color: #0ea5e9;
}

.stat-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ─── Timer Section ────────────────────────────────────────────────── */
.timer-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.timer-display {
  flex: 1;
}

.timer-time {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 48px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}

.timer-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  animation: pulseAnimation 1.5s infinite;
  display: inline-block;
}

@keyframes pulseAnimation {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.timer-info {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.timer-task-input {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 420px;
}

.timer-task-input input {
  flex: 1;
  padding: 8px 12px;
  font-size: 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.timer-task-input input:focus {
  outline: none;
  border-color: var(--accent);
  background: #ffffff;
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── Buttons ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-ghost {
  background: #ffffff;
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.btn-ghost:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: #cbd5e1;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 12px;
  border-radius: var(--radius-sm);
}

.btn-sm svg {
  width: 14px;
  height: 14px;
}

.btn-xl {
  padding: 16px 32px;
  font-size: 16px;
  border-radius: var(--radius-lg);
  font-weight: 700;
  box-shadow: var(--shadow-card);
}

.btn-clock-in {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-clock-in:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
}

.btn-clock-out {
  background: #dc2626;
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(220, 38, 38, 0.25);
}

.btn-clock-out:hover {
  background: #b91c1c;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(220, 38, 38, 0.35);
}

/* ─── Today's Sessions List ────────────────────────────────────────── */
.today-session {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
}

.today-session:last-child {
  border-bottom: none;
}

.today-session:hover {
  background: var(--bg-secondary);
}

.today-session-times {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.today-session-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.today-session-hours {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.today-session-amount {
  font-size: 12px;
  color: var(--text-muted);
}

/* ─── Filter Bar & Search ──────────────────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.filter-chip {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-chip:hover {
  border-color: #cbd5e1;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.filter-chip.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.search-box {
  display: flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  gap: 8px;
  margin-left: auto;
}

.search-box svg {
  color: var(--text-light);
  width: 15px;
  height: 15px;
}

.search-box input {
  border: none;
  outline: none;
  font-size: 13px;
  color: var(--text-primary);
  width: 160px;
}

/* ─── Tables ───────────────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.data-table th {
  padding: 12px 16px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: #f8fafc;
}

/* ─── Badges ───────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
}

.badge svg {
  width: 12px;
  height: 12px;
}

.badge-active {
  background: var(--color-active-bg);
  color: var(--color-active);
  border-color: var(--color-active-border);
}

.badge-unbilled {
  background: var(--color-unbilled-bg);
  color: var(--color-unbilled);
  border-color: var(--color-unbilled-border);
}

.badge-invoiced {
  background: var(--color-invoiced-bg);
  color: var(--color-invoiced);
  border-color: var(--color-invoiced-border);
}

.badge-paid {
  background: var(--color-paid-bg);
  color: var(--color-paid);
  border-color: var(--color-paid-border);
}

.badge-unpaid {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: var(--color-danger-border);
}

/* ─── Empty State ──────────────────────────────────────────────────── */
.empty-state {
  padding: 48px 24px;
  text-align: center;
}

.empty-state-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-state-icon svg {
  width: 24px;
  height: 24px;
}

.empty-state-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.empty-state-text {
  font-size: 13px;
  color: var(--text-muted);
}

/* ─── Invoice Detail Card ──────────────────────────────────────────── */
.invoice-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  gap: 16px;
}

.invoice-number {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.invoice-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.invoice-total-card {
  text-align: right;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.invoice-total-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.invoice-total-amount {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.invoice-actions {
  display: flex;
  gap: 10px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-primary);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 16px;
  padding: 4px 0;
}

.back-link svg {
  width: 16px;
  height: 16px;
}

/* ─── Modals ───────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  padding: 16px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: #ffffff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-modal);
  width: 100%;
  max-width: 520px;
  overflow: hidden;
  transform: scale(0.96) translateY(10px);
  transition: transform var(--transition-base);
  border: 1px solid var(--border-light);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  padding: 24px;
  max-height: 75vh;
  overflow-y: auto;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ─── Forms ────────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 18px;
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: #ffffff;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── Timeline (History) ───────────────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  padding-left: 20px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--border-light);
}

.timeline-item {
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -20px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--accent);
}

.timeline-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.timeline-field {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: capitalize;
}

.timeline-change {
  font-size: 13px;
  margin-top: 4px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.timeline-old {
  color: var(--color-danger);
  text-decoration: line-through;
}

.timeline-new {
  color: var(--color-paid);
  font-weight: 600;
}

.timeline-reason {
  font-size: 12px;
  font-style: italic;
  color: var(--text-muted);
  margin-top: 4px;
}

.timeline-date {
  font-size: 11px;
  color: var(--text-light);
  margin-top: 4px;
}

/* ─── Invoice Session Selection List ───────────────────────────────── */
.select-all-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 600;
}

.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.session-select-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 260px;
  overflow-y: auto;
  margin-bottom: 18px;
}

.session-select-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.session-select-item:hover {
  background: var(--bg-primary);
  border-color: #cbd5e1;
}

.session-select-info {
  flex: 1;
}

.session-select-date {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.session-select-times {
  font-size: 12px;
  color: var(--text-muted);
}

.session-select-hours {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.session-select-amount {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  min-width: 70px;
  text-align: right;
}

.preview-totals {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

.preview-total-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.preview-total-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2px;
}

/* ─── Settings ─────────────────────────────────────────────────────── */
.settings-section {
  max-width: 680px;
}

.settings-saved {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-paid);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.settings-saved.visible {
  opacity: 1;
}

/* ─── Toast Notifications ──────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  font-weight: 500;
  animation: slideInRight 250ms ease-out;
  min-width: 280px;
  max-width: 400px;
}

.toast.removing {
  opacity: 0;
  transform: translateX(40px);
  transition: all 250ms ease-in;
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

.toast-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.toast-icon svg {
  width: 18px;
  height: 18px;
}

.toast-success .toast-icon { color: var(--color-paid); }
.toast-error .toast-icon { color: var(--color-danger); }
.toast-info .toast-icon { color: var(--accent); }

/* ─── Mobile Sidebar Toggle ────────────────────────────────────────── */
.mobile-toggle {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 150;
  width: 40px;
  height: 40px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.mobile-toggle svg {
  width: 20px;
  height: 20px;
}

/* ═══════════════════════════════════════════════════════════════════
   AUTHENTICATION VIEW (Simple & Clean Centered Login)
   ═══════════════════════════════════════════════════════════════════ */
.auth-page {
  display: flex;
  min-height: 100vh;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  background: var(--bg-primary);
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-modal);
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.auth-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
}

/* ─── Responsive Media Queries ─────────────────────────────────────── */
@media (max-width: 960px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    padding: 24px 20px;
    padding-top: 72px;
  }

  .mobile-toggle {
    display: flex;
  }

  .auth-hero-side {
    display: none;
  }

  .auth-form-side {
    flex: 1;
    padding: 24px;
  }

  .welcome-banner {
    flex-direction: column;
    align-items: flex-start;
  }

  .welcome-progress {
    width: 100%;
  }

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