/* ==========================================================================
   Rebound — Study Planner Design System
   "A study plan that bounces back when you miss a day."
   ========================================================================== */

:root {
  /* Color Palette - Calm & Focused */
  --bg-canvas: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  
  --color-primary: #0F766E;
  --color-primary-hover: #115E59;
  --color-primary-light: #F0FDFA;
  
  --color-accent-amber: #D97706;
  --color-accent-amber-light: #FEF3C7;
  --color-accent-amber-border: #FCD34D;
  
  --color-success: #10B981;
  --color-success-light: #ECFDF5;
  
  --color-text: #0F172A;
  --color-text-secondary: #334155;
  --color-text-muted: #64748B;
  
  --border-subtle: #E2E8F0;
  --border-medium: #CBD5E1;
  
  /* Subject Accent Colors (Distinct: green reserved for done, amber for diffs, teal for app) */
  --color-indigo: #4F46E5;
  --bg-indigo: #EEF2FF;
  --border-indigo: #C7D2FE;
  
  --color-violet: #7C3AED;
  --bg-violet: #F5F3FF;
  --border-violet: #DDD6FE;
  
  --color-sky: #0284C7;
  --bg-sky: #E0F2FE;
  --border-sky: #BAE6FD;

  --color-rose: #E11D48;
  --bg-rose: #FFE4E6;
  --border-rose: #FECDD3;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Shadows & Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-modal: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App Header & Navigation */
.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.brand-text p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Segmented Navigation Pills */
.nav-pills {
  display: flex;
  background: var(--bg-canvas);
  padding: 0.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  gap: 0.25rem;
}

.nav-pill {
  border: none;
  background: transparent;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.nav-pill:hover {
  color: var(--color-text);
}

.nav-pill.active {
  background: var(--bg-surface);
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.125rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--color-text-secondary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-canvas);
  color: var(--color-text);
}

.btn-amber {
  background: var(--color-accent-amber);
  color: white;
}

.btn-amber:hover {
  background: #B45309;
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

/* App Main Container */
.main-content {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* Welcome View (First Run Empty State) */
.welcome-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-md);
  max-width: 580px;
  margin: 3rem auto;
}

.welcome-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.welcome-card h2 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.welcome-card p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.welcome-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
  text-align: left;
}

.highlight-item {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
}

.highlight-item h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.highlight-item p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
  line-height: 1.4;
}

/* Modals & Backdrop */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-modal);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--border-subtle);
  transform: translateY(10px);
  transition: transform var(--transition-normal);
}

.modal-backdrop.open .modal-dialog {
  transform: translateY(0);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background: var(--bg-canvas);
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
}

.modal-footer-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.125rem;
}

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

label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.form-control {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--bg-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

.input-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* Difficulty Selector (1-5) */
.difficulty-selector {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.375rem;
}

.diff-btn {
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  padding: 0.5rem 0.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-align: center;
  transition: all var(--transition-fast);
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.diff-btn:hover {
  background: var(--bg-canvas);
  border-color: var(--color-text-muted);
}

.diff-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Friendly Validation Banner */
.validation-banner {
  display: none;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: #FFFBEB;
  border: 1px solid #FCD34D;
  color: #92400E;
  font-size: 0.875rem;
  line-height: 1.4;
  margin-bottom: 1.25rem;
  align-items: flex-start;
  gap: 0.5rem;
}

.validation-banner.show {
  display: flex;
}

/* Exam Cards List in Manager */
.exams-list-container {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
}

.exams-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.exams-list-header h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text);
}

.exams-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.exam-card-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.exam-card-item:hover {
  border-color: var(--border-medium);
  background: #F1F5F9;
}

.exam-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.subject-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.2;
}

.subject-badge.badge-indigo {
  background: var(--bg-indigo);
  color: var(--color-indigo);
  border: 1px solid var(--border-indigo);
}

.subject-badge.badge-violet {
  background: var(--bg-violet);
  color: var(--color-violet);
  border: 1px solid var(--border-violet);
}

.subject-badge.badge-sky {
  background: var(--bg-sky);
  color: var(--color-sky);
  border: 1px solid var(--border-sky);
}

.subject-badge.badge-rose {
  background: var(--bg-rose);
  color: var(--color-rose);
  border: 1px solid var(--border-rose);
}

/* Amber is strictly reserved for changed/added time diffs */
.badge-diff-amber {
  background: var(--color-accent-amber-light);
  color: var(--color-accent-amber);
  border: 1px solid var(--color-accent-amber-border);
}

.exam-details {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.exam-title {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text);
}

.exam-subtext {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.exam-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.btn-icon {
  background: transparent;
  border: none;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
}

.btn-icon:hover {
  color: var(--color-text);
  background: rgba(0, 0, 0, 0.05);
}

.btn-icon.btn-delete:hover {
  color: #DC2626;
  background: #FEE2E2;
}

/* Settings card section */
.settings-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.settings-box h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.settings-box p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.125rem;
}

.btn-text-danger {
  background: transparent;
  border: none;
  color: #DC2626;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.375rem 0.5rem;
  border-radius: var(--radius-sm);
}

.btn-text-danger:hover {
  background: #FEE2E2;
}

/* ==========================================================================
   Full Plan Timeline & Day Cards
   ========================================================================== */
.plan-container {
  max-width: 800px;
  margin: 0 auto;
}

.plan-header-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.timeline-day-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.timeline-day-card:hover {
  border-color: var(--border-medium);
}

.timeline-day-card.is-exam-day {
  border-left: 5px solid var(--color-primary);
  background: #FAFAF9;
}

.timeline-day-card.has-revision {
  border-left: 5px solid var(--color-accent-amber);
}

.timeline-day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
}

.timeline-day-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timeline-day-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge-exam-pill {
  background: #FEE2E2;
  color: #991B1B;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
}

.badge-revision-pill {
  background: #FEF3C7;
  color: #92400E;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
}

.timeline-tasks-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.timeline-task-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0.875rem;
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  gap: 0.75rem;
}

.timeline-task-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
}

.timeline-task-chapters {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.timeline-task-hours {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Today Screen & Task Cards
   ========================================================================== */
.today-container {
  max-width: 680px;
  margin: 0 auto;
}

.today-header-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.today-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.today-date-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.nearest-exam-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.3125rem 0.75rem;
  border-radius: var(--radius-full);
}

/* Progress Bar */
.progress-container {
  margin-top: 0.5rem;
}

.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.progress-track {
  width: 100%;
  height: 10px;
  background: #E2E8F0;
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-success);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

/* Today Tasks List */
.today-tasks-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.today-task-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.today-task-card:hover {
  border-color: var(--border-medium);
}

.today-task-card.is-done {
  background: #F0FDF4;
  border-color: #BBF7D0;
}

.today-task-card.is-done .task-chapter-text {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

.task-left-content {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex: 1;
}

.task-checkbox-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
}

.task-checkbox {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--border-medium);
  cursor: pointer;
  accent-color: var(--color-success);
}

.task-desc {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.task-subject-tag {
  display: inline-block;
  align-self: flex-start;
}

.task-chapter-text {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.task-right-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* All Done Celebration Banner */
.all-done-banner {
  background: var(--color-success-light);
  border: 1px solid #BBF7D0;
  border-radius: var(--radius-lg);
  padding: 1.125rem 1.25rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  box-shadow: var(--shadow-sm);
}

.all-done-icon {
  font-size: 1.75rem;
  line-height: 1;
  flex-shrink: 0;
}

.all-done-content h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #065F46;
  margin-bottom: 0.125rem;
}

.all-done-content p {
  font-size: 0.8125rem;
  color: #047857;
}

/* Missed Today Action Box */
.missed-today-box {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
}

.missed-today-text h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #92400E;
}

.missed-today-text p {
  font-size: 0.8125rem;
  color: #B45309;
  margin-top: 0.125rem;
}

/* ==========================================================================
   Missed Day Preview & Diff Styles
   ========================================================================== */
.diff-container {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.diff-headline-box {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}

.diff-headline-box h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #92400E;
  margin-bottom: 0.25rem;
}

.diff-headline-box p {
  font-size: 0.8125rem;
  color: #B45309;
  line-height: 1.4;
}

.diff-day-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.diff-day-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.diff-day-title {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text);
}

.diff-day-hours-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.diff-before-hours {
  color: var(--color-text-muted);
  font-weight: 500;
}

.diff-arrow {
  color: var(--color-text-muted);
  font-weight: 700;
}

.diff-after-hours {
  font-weight: 700;
  color: var(--color-text);
}

.diff-badge-amber {
  background: #FEF3C7;
  color: #92400E;
  border: 1px solid #FCD34D;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

/* Changed Day Card Highlight Pulse */
@keyframes amberPulse {
  0% { box-shadow: 0 0 0 0 rgba(217, 119, 6, 0.4); border-color: #F59E0B; }
  50% { box-shadow: 0 0 0 8px rgba(217, 119, 6, 0); border-color: #FBBF24; }
  100% { box-shadow: 0 0 0 0 rgba(217, 119, 6, 0); border-color: var(--border-subtle); }
}

.timeline-day-card.highlight-amber-pulse {
  animation: amberPulse 2s ease-out 2;
  border-left: 5px solid #F59E0B !important;
}

/* Floating Undo Toast */
.undo-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: #1E293B;
  color: #F8FAFC;
  border-radius: var(--radius-lg);
  padding: 0.875rem 1.25rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 1000;
  animation: slideUp 0.25s ease-out;
}

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

.undo-toast-text {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.undo-toast-text svg {
  color: #F59E0B;
  flex-shrink: 0;
}

.btn-undo-action {
  background: #334155;
  color: #F8FAFC;
  border: 1px solid #475569;
  border-radius: var(--radius-sm);
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-undo-action:hover {
  background: #475569;
  color: white;
}

.btn-icon-sm {
  background: transparent;
  border: none;
  color: #94A3B8;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.125rem 0.25rem;
}

.btn-icon-sm:hover {
  color: white;
}

/* ==========================================================================
   Reality Check Forecast (What-If Simulator)
   ========================================================================== */
.forecast-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.forecast-header-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.forecast-header-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.forecast-header-subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
  margin-bottom: 0.875rem;
}

.forecast-disclaimer {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #F1F5F9;
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-md);
  border: 1px solid #E2E8F0;
  line-height: 1.4;
}

.forecast-section {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.forecast-section-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Section 1: Where You Stand Cards */
.forecast-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.forecast-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  transition: all var(--transition-fast);
}

.forecast-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-medium);
}

.forecast-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.forecast-days-left {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--bg-canvas);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
}

.forecast-card-metrics {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
}

.forecast-metric-needed {
  color: var(--color-text-secondary);
}

.forecast-metric-sched {
  font-weight: 600;
  color: var(--color-text);
}

/* Coverage Bar */
.forecast-bar-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.forecast-bar-track {
  width: 100%;
  height: 10px;
  background: #E2E8F0;
  border-radius: var(--radius-full);
  overflow: hidden;
}

.forecast-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-normal), background-color var(--transition-fast);
}

.forecast-bar-fill.bar-on-track {
  background: #10B981;
}

.forecast-bar-fill.bar-tight {
  background: #3B82F6;
}

.forecast-bar-fill.bar-behind {
  background: #EF4444;
}

.forecast-bar-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

/* Status Badges - strictly NO AMBER */
.forecast-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.3125rem 0.75rem;
  border-radius: var(--radius-full);
  align-self: flex-start;
}

.forecast-status-badge.status-on-track {
  background: #ECFDF5;
  color: #065F46;
  border: 1px solid #A7F3D0;
}

.forecast-status-badge.status-tight {
  background: #EFF6FF;
  color: #1E40AF;
  border: 1px solid #BFDBFE;
}

.forecast-status-badge.status-behind {
  background: #FEF2F2;
  color: #991B1B;
  border: 1px solid #FECACA;
}

/* Section 2: Simulator Box */
.forecast-simulator-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.forecast-slider-row {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.forecast-slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.forecast-slider-header label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.forecast-slider-display {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.forecast-slider-input {
  width: 100%;
  accent-color: var(--color-primary);
  height: 8px;
  cursor: pointer;
}

.forecast-slider-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.forecast-comparison-banner {
  padding: 0.875rem 1.125rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.4;
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.forecast-comparison-banner.banner-success {
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
  color: #065F46;
}

.forecast-comparison-banner.banner-warning {
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
  color: #1E40AF;
}

.forecast-comparison-banner.banner-deficit {
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #991B1B;
}

/* Section 3: The Minimum You Need */
.forecast-minimum-card {
  background: #F8FAFC;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
}

.forecast-minimum-sentence {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.5;
  margin: 0;
}

/* Responsive Media Queries */
@media (max-width: 640px) {
  .header-container {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  
  .brand {
    justify-content: center;
  }
  
  .nav-pills {
    justify-content: center;
    width: 100%;
  }

  .nav-pill {
    flex: 1;
    text-align: center;
    min-height: 44px;
    padding: 0.5rem 0.5rem;
    font-size: 0.8125rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .header-actions {
    justify-content: center;
  }

  .header-actions .btn {
    width: 100%;
  }

  .welcome-highlights {
    grid-template-columns: 1fr;
  }

  .main-content {
    padding: 1rem 0.875rem 3rem;
  }

  .welcome-card {
    padding: 2.25rem 1.25rem;
    margin: 1rem auto;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .modal-dialog {
    max-width: calc(100vw - 1.25rem);
    margin: 0.625rem auto;
    border-radius: var(--radius-md);
  }

  .modal-body {
    padding: 1.125rem;
  }

  .modal-footer {
    padding: 1rem 1.125rem;
    flex-direction: column-reverse;
    align-items: stretch;
  }

  .modal-footer-actions {
    width: 100%;
    margin-left: 0;
  }

  .modal-footer-actions .btn {
    flex: 1;
  }

  .today-meta-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.625rem;
  }

  .plan-header-box {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .plan-header-box .btn {
    width: 100%;
  }

  .diff-day-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .diff-day-hours-box {
    width: 100%;
    justify-content: space-between;
  }

  .undo-toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    flex-direction: row;
    justify-content: space-between;
  }
}