/* ==========================================================================
   STUDYBUDDY - Modern Study Companion
   Styles & SaaS Aesthetic Theme
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #0B1020;
  --bg-secondary: #0F172A;
  --bg-card: #111827;
  --bg-card-hover: #1E293B;
  --bg-card-subtle: rgba(17, 24, 39, 0.7);
  --bg-input: #1E293B;
  --bg-sidebar: #0E1628;

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  --color-primary: #6366F1;
  --color-primary-hover: #4F46E5;
  --color-primary-light: rgba(99, 102, 241, 0.15);
  --color-primary-glow: rgba(99, 102, 241, 0.35);

  --color-accent: #06B6D4;
  --color-accent-light: rgba(6, 182, 212, 0.15);
  --color-accent-glow: rgba(6, 182, 212, 0.3);

  --color-success: #10B981;
  --color-success-light: rgba(16, 185, 129, 0.15);
  --color-warning: #F59E0B;
  --color-warning-light: rgba(245, 158, 11, 0.15);
  --color-danger: #EF4444;
  --color-danger-light: rgba(239, 68, 68, 0.15);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);

  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --card-shadow-hover: 0 20px 30px -10px rgba(0, 0, 0, 0.6), 0 10px 15px -5px rgba(99, 102, 241, 0.15);
  --glow-primary: 0 0 25px rgba(99, 102, 241, 0.35);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #F8FAFC;
  --bg-secondary: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-card-subtle: rgba(255, 255, 255, 0.85);
  --bg-input: #F1F5F9;
  --bg-sidebar: #FFFFFF;

  --text-primary: #111827;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;

  --color-primary: #6366F1;
  --color-primary-hover: #4F46E5;
  --color-primary-light: rgba(99, 102, 241, 0.1);
  --color-primary-glow: rgba(99, 102, 241, 0.2);

  --color-accent: #06B6D4;
  --color-accent-light: rgba(6, 182, 212, 0.1);
  --color-accent-glow: rgba(6, 182, 212, 0.2);

  --border-color: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(99, 102, 241, 0.4);

  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --card-shadow-hover: 0 20px 30px -10px rgba(99, 102, 241, 0.12), 0 8px 15px -5px rgba(0, 0, 0, 0.04);
  --glow-primary: 0 0 20px rgba(99, 102, 241, 0.15);
}

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

html, body {
  height: 100%;
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- App Layout --- */
.app-container {
  display: flex;
  min-height: 100vh;
  position: relative;
  overflow: hidden;
}

/* Background Ambient Orbs */
.ambient-orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(100px);
  z-index: 0;
  opacity: 0.35;
  transition: opacity var(--transition-normal);
}

[data-theme="light"] .ambient-orb {
  opacity: 0.18;
}

.orb-1 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
  top: -150px;
  right: -100px;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
  bottom: -200px;
  left: 200px;
}

/* --- Sidebar --- */
.sidebar {
  width: 260px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1.75rem 1.25rem;
  z-index: 20;
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

.brand-section {
  display: flex;
  flex-direction: column;
  margin-bottom: 2.25rem;
  padding: 0 0.5rem;
}

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.35rem;
}

.brand-icon {
  font-size: 1.6rem;
  line-height: 1;
  display: inline-block;
  transform: translateY(-1px);
}

.brand-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Navigation */
.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.93rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
  user-select: none;
}

.nav-item svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  transition: transform var(--transition-fast), stroke var(--transition-fast);
  flex-shrink: 0;
}

.nav-item:hover {
  color: var(--text-primary);
  background-color: var(--color-primary-light);
  transform: translateX(3px);
}

.nav-item.active {
  color: #FFFFFF;
  background: linear-gradient(135deg, var(--color-primary) 0%, #4338CA 100%);
  font-weight: 600;
  box-shadow: 0 4px 15px -2px var(--color-primary-glow);
}

.nav-item.active svg {
  stroke: #FFFFFF;
}

.nav-badge {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-item.active .nav-badge {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

/* Sidebar Footer */
.sidebar-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.toggle-switch {
  width: 36px;
  height: 20px;
  background: var(--bg-input);
  border-radius: var(--radius-full);
  position: relative;
  transition: background var(--transition-fast);
  border: 1px solid var(--border-color);
}

.toggle-slider {
  width: 14px;
  height: 14px;
  background: var(--color-primary);
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 3px;
  transition: transform var(--transition-smooth);
}

[data-theme="light"] .toggle-slider {
  transform: translateX(16px);
  background: var(--color-accent);
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  z-index: 10;
  overflow-y: auto;
  max-width: 100%;
}

/* --- App Header --- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 2.5rem 1.25rem 2.5rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 15;
}

.greeting-block {
  display: flex;
  flex-direction: column;
}

.greeting-title {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.greeting-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-theme-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.header-theme-btn:hover {
  color: var(--color-primary);
  border-color: var(--border-focus);
  transform: scale(1.05);
}

.profile-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #FFFFFF;
  box-shadow: 0 3px 10px var(--color-primary-glow);
  position: relative;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.profile-circle:hover {
  transform: scale(1.05);
}

.profile-status-dot {
  position: absolute;
  bottom: 1px;
  right: 1px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-success);
  border: 2px solid var(--bg-card);
}

/* --- Views Container & Animated Page Switch --- */
.view-container {
  padding: 2rem 2.5rem 4rem 2.5rem;
  flex: 1;
}

.view {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.view.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: viewFadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes viewFadeIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Primary & Secondary Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, #4F46E5 100%);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 15px -2px var(--color-primary-glow);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -2px var(--color-primary-glow);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--color-danger-light);
  color: var(--color-danger);
  transform: scale(1.08);
}

/* --- DASHBOARD: Hero Section --- */
.dashboard-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2.25rem 2.5rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(6, 182, 212, 0.08) 100%), var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.dashboard-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 60%;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Motivational Quote Box */
.quote-card {
  z-index: 1;
  max-width: 340px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.quote-icon {
  font-size: 1.25rem;
  color: var(--color-accent);
}

.quote-text {
  font-size: 0.92rem;
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.4;
}

.quote-author {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: right;
}

/* --- STAT CARDS GRID --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(99, 102, 241, 0.3);
}

.stat-card:hover::after {
  opacity: 1;
}

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

.stat-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.stat-icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.icon-blue {
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-primary);
}

.icon-cyan {
  background: rgba(6, 182, 212, 0.15);
  color: var(--color-accent);
}

.icon-amber {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
}

.icon-emerald {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.stat-value {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.stat-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- DASHBOARD TWO-COLUMN SECTION --- */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 1.5rem;
}

.card-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.panel-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.panel-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* Daily Progress Bar Component */
.progress-box {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.progress-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.progress-pct {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.progress-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.progress-track {
  width: 100%;
  height: 14px;
  background: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  animation: shimmer 2s infinite linear;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Streak Callout Card */
.streak-banner {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(239, 68, 68, 0.08) 100%);
  border: 1px solid rgba(245, 158, 11, 0.25);
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.streak-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(245, 158, 11, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
  animation: flameBounce 2s infinite ease-in-out;
}

@keyframes flameBounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1) translateY(-2px); }
}

.streak-info {
  display: flex;
  flex-direction: column;
}

.streak-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.streak-text {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* --- TASKS COMPONENT (Shared between Dashboard preview & Tasks view) --- */
.tasks-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  position: relative;
  user-select: none;
}

.task-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.25);
  transform: translateX(2px);
}

/* Custom Checkbox */
.custom-checkbox {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  background: transparent;
}

.custom-checkbox svg {
  width: 14px;
  height: 14px;
  stroke: #FFFFFF;
  stroke-width: 3;
  opacity: 0;
  transform: scale(0.5);
  transition: all var(--transition-fast);
}

.task-item.completed .custom-checkbox {
  background: var(--color-success);
  border-color: var(--color-success);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.task-item.completed .custom-checkbox svg {
  opacity: 1;
  transform: scale(1);
}

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

.task-item.completed {
  opacity: 0.65;
}

.task-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.task-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-fast);
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  text-transform: capitalize;
}

.badge-subject {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-duration {
  background: rgba(148, 163, 184, 0.15);
  color: var(--text-secondary);
}

.badge-priority-high {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.badge-priority-medium {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.badge-priority-low {
  background: var(--color-success-light);
  color: var(--color-success);
}

.task-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3.5rem 1.5rem;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  background: rgba(17, 24, 39, 0.3);
}

.empty-state-icon {
  font-size: 3.2rem;
  margin-bottom: 1rem;
  opacity: 0.75;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.empty-state-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 320px;
  margin-bottom: 1.5rem;
}

/* --- TASKS VIEW SPECIFIC STYLES --- */
.tasks-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.tasks-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.search-box-wrap {
  position: relative;
  flex: 1;
  min-width: 240px;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.7rem 1rem 0.7rem 2.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.filter-pills {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  gap: 0.25rem;
}

.filter-pill {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

.filter-pill.active {
  background: var(--color-primary);
  color: #FFFFFF;
  font-weight: 600;
  box-shadow: 0 2px 8px var(--color-primary-glow);
}

.select-filter {
  padding: 0.7rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.select-filter:focus {
  border-color: var(--color-primary);
}

/* --- FOCUS VIEW: POMODORO TIMER --- */
.focus-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 650px;
  margin: 0 auto;
  text-align: center;
}

.focus-header-text {
  margin-bottom: 2rem;
}

.focus-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.focus-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Mode Switcher Tabs */
.timer-modes {
  display: inline-flex;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.3rem;
  gap: 0.4rem;
  margin-bottom: 2.5rem;
}

.timer-mode-btn {
  padding: 0.55rem 1.4rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.timer-mode-btn:hover {
  color: var(--text-primary);
}

.timer-mode-btn.active {
  background: linear-gradient(135deg, var(--color-primary) 0%, #4338CA 100%);
  color: #FFFFFF;
  box-shadow: 0 2px 10px var(--color-primary-glow);
}

/* Circular Timer Graphic */
.circular-timer-wrap {
  position: relative;
  width: 320px;
  height: 320px;
  margin: 0 auto 2.5rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timer-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-circle-bg {
  fill: none;
  stroke: var(--bg-card);
  stroke-width: 12;
}

.timer-circle-progress {
  fill: none;
  stroke: url(#timerGradient);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 534.07;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.8s linear;
}

.timer-inner-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.timer-display {
  font-size: 4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.4rem;
  transition: transform 0.2s ease;
}

.timer-ticking .timer-display {
  animation: timerPulse 2s infinite ease-in-out;
}

@keyframes timerPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

.timer-session-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.timer-task-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  max-width: 180px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Timer Control Buttons */
.timer-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.btn-timer-primary {
  min-width: 140px;
  padding: 0.9rem 2.2rem;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-full);
}

.btn-timer-reset {
  min-width: 110px;
  padding: 0.9rem 1.8rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

/* Duration Summary Cards */
.timer-durations-summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.duration-pill {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.duration-pill strong {
  color: var(--text-primary);
}

/* --- PROGRESS VIEW --- */
.progress-view-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

/* Weekly Study Time SVG Chart */
.chart-container {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chart-svg-wrap {
  width: 100%;
  height: 240px;
  position: relative;
}

.weekly-chart-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.chart-bar-bg {
  fill: var(--bg-input);
  rx: 8;
  ry: 8;
}

.chart-bar {
  fill: url(#barGradient);
  rx: 8;
  ry: 8;
  transform-origin: bottom;
  transition: height 0.8s cubic-bezier(0.16, 1, 0.3, 1), y 0.8s cubic-bezier(0.16, 1, 0.3, 1), fill var(--transition-fast);
  cursor: pointer;
}

.chart-bar:hover {
  fill: url(#barHoverGradient);
  filter: drop-shadow(0 4px 8px var(--color-primary-glow));
}

.chart-label {
  font-size: 11px;
  fill: var(--text-muted);
  text-anchor: middle;
  font-weight: 600;
}

.chart-val-label {
  font-size: 11px;
  fill: var(--text-primary);
  text-anchor: middle;
  font-weight: 700;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.chart-bar-group:hover .chart-val-label {
  opacity: 1;
}

/* Subject Progress Bars */
.subject-bars-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.subject-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.subject-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
}

.subject-name {
  font-weight: 600;
  color: var(--text-primary);
}

.subject-pct {
  font-weight: 700;
  color: var(--color-accent);
}

.subject-track {
  width: 100%;
  height: 10px;
  background: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.subject-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  transition: width 1s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 7-Day Habit Tracker */
.week-habit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.habit-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.habit-day-letter {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.habit-day-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.habit-day-dot.active {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 0 12px var(--color-primary-glow);
}

/* --- ADD TASK MODAL --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.modal-card {
  width: 100%;
  max-width: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
  padding: 2rem;
  transform: scale(0.94) translateY(10px);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.modal-close-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

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

/* Modal Form Controls */
.modal-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* Quick Duration Chips */
.quick-chips {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.3rem;
  flex-wrap: wrap;
}

.chip-btn {
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--border-focus);
}

/* Priority Segmented Options */
.priority-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.priority-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.priority-label input {
  display: none;
}

.priority-label:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.priority-label.selected-high {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.priority-label.selected-medium {
  background: var(--color-warning-light);
  color: var(--color-warning);
  border-color: var(--color-warning);
}

.priority-label.selected-low {
  background: var(--color-success-light);
  color: var(--color-success);
  border-color: var(--color-success);
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  z-index: 200;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.85rem 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.5);
  transform: translateX(120%);
  opacity: 0;
  transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.32s ease;
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast.hide {
  transform: translateX(120%);
  opacity: 0;
}

.toast-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
}

.toast-message {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}

/* --- MOBILE BOTTOM NAVIGATION --- */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card-subtle);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  z-index: 40;
  justify-content: space-around;
  align-items: center;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-nav-item svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  transition: stroke var(--transition-fast);
}

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

.mobile-nav-item.active svg {
  stroke: var(--color-primary);
}

/* --- RESPONSIVE BREAKPOINTS --- */
@media (max-width: 1024px) {
  .sidebar {
    width: 220px;
    padding: 1.5rem 1rem;
  }
  .app-header {
    padding: 1.25rem 1.75rem;
  }
  .view-container {
    padding: 1.5rem 1.75rem 3rem 1.75rem;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .progress-view-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
  .mobile-nav {
    display: flex;
  }
  .main-content {
    margin-bottom: 60px;
  }
  .app-header {
    padding: 1rem 1.25rem;
  }
  .greeting-title {
    font-size: 1.25rem;
  }
  .greeting-subtitle {
    font-size: 0.8rem;
  }
  .view-container {
    padding: 1.25rem 1.25rem 2.5rem 1.25rem;
  }
  .dashboard-hero {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 1.25rem;
  }
  .hero-content {
    max-width: 100%;
  }
  .quote-card {
    max-width: 100%;
    width: 100%;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .circular-timer-wrap {
    width: 260px;
    height: 260px;
  }
  .timer-display {
    font-size: 3.2rem;
  }
  .toast-container {
    left: 1rem;
    right: 1rem;
    bottom: 5rem;
  }
  .toast {
    min-width: unset;
    width: 100%;
  }
}