/* ============================================
   CURRICULUM TRACKER - Modern Styles
   ============================================
   A clean, modern UI built on the design system
   ============================================ */

/* ============================================
   ACCESSIBILITY UTILITIES
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   LAYOUT CONTAINERS
   ============================================ */
.main-content {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: var(--space-6) var(--space-8);
    animation: fade-in var(--transition-slow) var(--ease-out);
}

.dashboard-container,
.curriculum-container,
.analytics-container,
.day-container {
    display: grid;
    gap: var(--space-8);
}

/* ============================================
   NAVIGATION BAR
   ============================================ */
.navbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(8px);
    background: oklch(1 0 0 / 0.95);
}

.dark .navbar {
    background: oklch(0.2429 0.0304 283.9110 / 0.95);
}

.nav-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: var(--space-4) var(--space-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-8);
}

.nav-logo h2 {
    color: var(--primary);
    font-weight: 700;
    font-size: var(--text-xl);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    letter-spacing: var(--tracking-tight);
}

.nav-logo h2 i {
    font-size: var(--text-2xl);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
}

.nav-menu li {
    list-style: none;
}

.nav-menu a {
    text-decoration: none;
    color: var(--muted-foreground);
    font-weight: 500;
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast) var(--ease-out);
    display: inline-block;
}

.nav-menu a:hover {
    color: var(--foreground);
    background: var(--muted);
}

.nav-menu a.active {
    color: var(--primary);
    background: oklch(0.5547 0.2503 297.0156 / 0.1);
}

.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.user-email {
    color: var(--muted-foreground);
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--text-xl);
    color: var(--foreground);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast) var(--ease-out);
}

.mobile-menu-toggle:hover {
    background: var(--muted);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    color: var(--foreground);
    font-weight: 600;
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
}

h1 {
    font-size: var(--text-4xl);
    font-weight: 700;
}

h2 {
    font-size: var(--text-2xl);
}

h3 {
    font-size: var(--text-xl);
}

h4 {
    font-size: var(--text-lg);
}

p {
    color: var(--muted-foreground);
    line-height: var(--leading-relaxed);
}

/* ============================================
   DASHBOARD HEADER
   ============================================ */
.dashboard-header,
.curriculum-header,
.analytics-header {
    text-align: center;
    padding: var(--space-4) 0 var(--space-8);
}

.dashboard-header h1,
.curriculum-header h1,
.analytics-header h1 {
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

.dashboard-subtitle,
.curriculum-subtitle,
.analytics-subtitle {
    color: var(--muted-foreground);
    font-size: var(--text-lg);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: var(--text-sm);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition-fast) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: var(--primary);
    color: var(--primary-foreground);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: oklch(0.4847 0.2503 297.0156);
    box-shadow: var(--shadow-primary);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-xs);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--secondary-foreground);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--muted);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--chart-3);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-success:hover:not(:disabled) {
    background: oklch(0.5550 0.1772 140.4448);
    box-shadow: var(--shadow-success);
    transform: translateY(-1px);
}

.btn-warning {
    background: var(--chart-4);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-warning:hover:not(:disabled) {
    background: oklch(0.6220 0.2041 42.4293);
    box-shadow: var(--shadow-warning);
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--destructive);
    color: var(--destructive-foreground);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
    background: oklch(0.4805 0.2155 19.8095);
    box-shadow: var(--shadow-danger);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border);
    color: var(--foreground);
}

.btn-outline:hover:not(:disabled) {
    background: var(--muted);
    border-color: var(--muted-foreground);
}

.btn-ghost {
    background: transparent;
    color: var(--foreground);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--muted);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.btn-icon {
    padding: var(--space-2);
    aspect-ratio: 1;
}

.btn-copy,
.btn-logout,
.btn-login,
.btn-register {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition-fast) var(--ease-out);
}

/* ============================================
   CARDS - Base Styles
   ============================================ */
.card {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base) var(--ease-out);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* ============================================
   PROGRESS CARDS
   ============================================ */
.progress-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-5);
}

.progress-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: flex-start;
    gap: var(--space-5);
    transition: all var(--transition-base) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.progress-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition-base) var(--ease-out);
}

.progress-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.progress-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    color: white;
    flex-shrink: 0;
}

.card-icon.concepts {
    background: linear-gradient(135deg, var(--primary), oklch(0.6547 0.2503 297.0156));
}

.card-icon.projects {
    background: linear-gradient(135deg, var(--chart-3), oklch(0.7250 0.1772 140.4448));
}

.card-icon.time {
    background: linear-gradient(135deg, var(--chart-4), oklch(0.7920 0.2041 42.4293));
}

.card-icon.streak {
    background: linear-gradient(135deg, var(--destructive), oklch(0.6505 0.2155 19.8095));
}

.card-content {
    flex: 1;
    min-width: 0;
}

.card-content h3 {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--muted-foreground);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

.card-content p {
    font-size: var(--text-sm);
    color: var(--muted-foreground);
    margin: 0;
}

.time-display,
.streak-display {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--foreground);
    margin-bottom: var(--space-1);
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--muted);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: var(--space-3) 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--chart-3), oklch(0.7250 0.1772 140.4448));
    border-radius: var(--radius-full);
    transition: width 1s var(--ease-out);
    animation: progress-fill 1s var(--ease-out);
}

.mini-progress-bar {
    height: 6px;
}

.mini-progress-fill {
    height: 100%;
    background: var(--chart-3);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow) var(--ease-out);
}

/* ============================================
   DASHBOARD SECTIONS
   ============================================ */
.dashboard-sections {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-6);
}

.current-focus,
.recent-activity {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
}

.current-focus h2,
.recent-activity h2 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.current-day-card {
    background: var(--muted);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-5);
    border-left: 4px solid var(--primary);
}

.current-day-card h3 {
    font-size: var(--text-base);
    margin-bottom: var(--space-2);
}

/* Activity List */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.activity-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--muted);
    border-radius: var(--radius-lg);
    transition: background var(--transition-fast) var(--ease-out);
}

.activity-item:hover {
    background: oklch(0.8560 0.0117 264.5071);
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-sm);
    flex-shrink: 0;
}

.activity-content h4 {
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.activity-content p {
    font-size: var(--text-xs);
    margin: 0;
}

/* ============================================
   QUICK ACTIONS
   ============================================ */
.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    padding: var(--space-6) 0;
}

.quick-actions .btn {
    min-width: 160px;
}

.day-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
    padding: var(--space-6) 0;
}

/* ============================================
   WEEK CARDS
   ============================================ */
.weeks-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.week-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base) var(--ease-out);
}

.week-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.week-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--primary), oklch(0.4547 0.2103 297.0156));
    color: white;
}

.week-info h2 {
    color: white;
    margin: 0 0 var(--space-2) 0;
    font-size: var(--text-xl);
}

.week-number {
    display: block;
    font-size: var(--text-xs);
    font-weight: 500;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    margin-bottom: var(--space-1);
}

.week-title {
    display: block;
    font-weight: 700;
}

.week-description {
    margin: 0;
    opacity: 0.9;
    font-size: var(--text-sm);
}

/* Progress Circle */
.week-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.progress-circle {
    position: relative;
    width: 72px;
    height: 72px;
}

.circular-chart {
    display: block;
    width: 72px;
    height: 72px;
}

.circle-bg {
    fill: none;
    stroke: oklch(1 0 0 / 0.2);
    stroke-width: 3;
}

.circle {
    fill: none;
    stroke-width: 3;
    stroke-linecap: round;
    stroke: oklch(1 0 0 / 0.95);
    transition: stroke-dasharray 1s var(--ease-out);
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--text-sm);
    font-weight: 700;
    color: white;
}

.week-stats {
    text-align: center;
    font-size: var(--text-xs);
}

.completed-count {
    display: block;
    font-weight: 600;
    opacity: 0.95;
}

.completed-label {
    opacity: 0.8;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

/* Week Timeline */
.week-timeline {
    padding: var(--space-6);
}

.week-timeline h3 {
    margin: 0 0 var(--space-5) 0;
    font-size: var(--text-base);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ============================================
   DAY CARDS
   ============================================ */
.days-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-5);
}

.day-card {
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.day-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.day-card.completed {
    border-color: var(--chart-3);
    background: oklch(0.9750 0.0372 140.4448 / 0.5);
}

.day-card.in-progress {
    border-color: var(--chart-4);
    background: oklch(0.9720 0.0341 42.4293 / 0.5);
}

.day-card.weekend-day {
    border-color: var(--chart-4);
    background: oklch(0.9780 0.0233 307.0156 / 0.3);
}

.day-number {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.day-number .number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: var(--text-base);
}

.weekend-icon {
    color: var(--chart-4);
    font-size: var(--text-sm);
}

.day-title {
    margin: 0 0 var(--space-2) 0;
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--foreground);
    line-height: var(--leading-snug);
}

.day-concepts {
    margin: 0 0 var(--space-4) 0;
    font-size: var(--text-sm);
    color: var(--muted-foreground);
    line-height: var(--leading-relaxed);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.day-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.project-info,
.languages {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--muted-foreground);
}

.day-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-indicators {
    display: flex;
    gap: var(--space-2);
}

.indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 2px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--card);
    color: var(--muted-foreground);
    font-size: var(--text-xs);
    transition: all var(--transition-fast) var(--ease-out);
}

.indicator.completed {
    border-color: var(--chart-3);
    background: var(--chart-3);
    color: white;
}

.study-time {
    font-size: var(--text-xs);
    color: var(--muted-foreground);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.difficulty-rating {
    display: flex;
    gap: 2px;
}

.difficulty-rating i {
    font-size: 0.65rem;
    color: var(--border);
}

.difficulty-rating i.active {
    color: var(--chart-4);
}

/* Badges */
.weekend-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--chart-4);
    color: white;
    font-size: var(--text-xs);
    font-weight: 500;
    padding: var(--space-1) var(--space-3);
    border-radius: 0 var(--radius-lg) 0 var(--radius-lg);
}

.completion-badge {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    color: var(--chart-3);
    font-size: var(--text-xl);
}

/* ============================================
   DAY DETAIL PAGE
   ============================================ */
.day-header {
    margin-bottom: var(--space-6);
}

.day-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.day-navigation h1 {
    font-size: var(--text-2xl);
    text-align: center;
    flex: 1;
}

.day-progress-indicators {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    margin-bottom: var(--space-6);
}

.progress-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    background: var(--card);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
    min-width: 120px;
}

.progress-indicator:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.progress-indicator.completed {
    border-color: var(--chart-3);
    background: oklch(0.9750 0.0372 140.4448 / 0.5);
}

.progress-indicator i {
    font-size: var(--text-xl);
    margin-bottom: var(--space-2);
    color: var(--muted-foreground);
    transition: color var(--transition-fast) var(--ease-out);
}

.progress-indicator.completed i {
    color: var(--chart-3);
}

.progress-indicator span {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--foreground);
}

/* Content Sections */
.day-content {
    display: grid;
    gap: var(--space-6);
}

.concepts-section,
.claude-prompt-section,
.project-section,
.notes-section {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
}

.concepts-section h2,
.claude-prompt-section h2,
.project-section h2,
.notes-section h2 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border);
}

.concepts-content,
.project-content {
    display: grid;
    gap: var(--space-5);
}

.key-concepts h3,
.why-important h3,
.learning-elements h3,
.project-overview h3,
.project-steps h3 {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--foreground);
}

.key-concepts p,
.why-important p,
.project-overview p {
    line-height: var(--leading-relaxed);
}

/* Claude Prompt Styling */
.prompt-container {
    position: relative;
}

.claude-prompt {
    background: var(--muted);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    white-space: pre-wrap;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    overflow-x: auto;
    margin-bottom: var(--space-4);
    color: var(--foreground);
}

/* ============================================
   NOTES SECTION
   ============================================ */
.notes-container {
    display: grid;
    gap: var(--space-6);
}

.note-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.note-group h3 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--foreground);
}

.note-group textarea {
    width: 100%;
    min-height: 120px;
    padding: var(--space-4);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    resize: vertical;
    background: var(--background);
    color: var(--foreground);
    transition: border-color var(--transition-fast) var(--ease-out),
                box-shadow var(--transition-fast) var(--ease-out);
}

.note-group textarea:focus {
    outline: none;
    border-color: var(--ring);
    box-shadow: 0 0 0 3px oklch(0.5547 0.2503 297.0156 / 0.15);
}

.note-group textarea::placeholder {
    color: var(--muted-foreground);
}

.help-text {
    font-size: var(--text-xs);
    color: var(--muted-foreground);
}

.required-indicator {
    color: var(--destructive);
    font-weight: 700;
}

/* Rating Stars */
.rating-stars {
    display: flex;
    gap: var(--space-1);
}

.rating-stars .rating-button {
    background: none;
    border: none;
    padding: var(--space-2);
    cursor: pointer;
    transition: transform var(--transition-fast) var(--ease-spring);
    border-radius: var(--radius-md);
}

.rating-stars .rating-button:hover {
    transform: scale(1.2);
}

.rating-stars .rating-button i {
    color: var(--border);
    transition: color var(--transition-fast) var(--ease-out);
    font-size: var(--text-lg);
    pointer-events: none;
}

.rating-stars .rating-button:hover i,
.rating-stars .rating-button.active i {
    color: var(--chart-4);
}

.rating-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--muted-foreground);
    margin-top: var(--space-2);
}

/* ============================================
   MODALS
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: oklch(0 0 0 / 0.5);
    display: none;
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity var(--transition-base) var(--ease-out);
    backdrop-filter: blur(4px);
}

.modal.show {
    opacity: 1;
}

.modal-content {
    background: var(--card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    margin: 10vh auto;
    padding: var(--space-8);
    width: 90%;
    max-width: 500px;
    position: relative;
    animation: scale-in var(--transition-base) var(--ease-spring);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border);
}

.modal-title {
    margin: 0;
    font-size: var(--text-xl);
}

.close,
.modal-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--muted-foreground);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast) var(--ease-out);
    line-height: 1;
    position: absolute;
    right: var(--space-4);
    top: var(--space-4);
}

.close:hover,
.modal-close:hover {
    background: var(--muted);
    color: var(--foreground);
}

.modal h2 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-6);
    text-align: center;
}

.timer-display {
    font-size: var(--text-5xl);
    font-weight: 700;
    text-align: center;
    color: var(--primary);
    margin: var(--space-6) 0;
    font-family: var(--font-mono);
    letter-spacing: var(--tracking-tight);
}

.session-controls {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    margin-bottom: var(--space-6);
}

.session-notes-input label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.session-notes-input textarea {
    width: 100%;
    min-height: 80px;
    padding: var(--space-3);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    resize: vertical;
    background: var(--background);
    color: var(--foreground);
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: oklch(0 0 0 / 0.5);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base) var(--ease-out);
    pointer-events: none;
    backdrop-filter: blur(4px);
}

.modal-overlay.show {
    opacity: 1;
    pointer-events: all;
}

.modal-overlay .modal-content {
    margin: 0;
    transform: scale(0.95);
    transition: transform var(--transition-base) var(--ease-spring);
}

.modal-overlay.show .modal-content {
    transform: scale(1);
}

.modal-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
    margin-top: var(--space-6);
}

/* ============================================
   FLOATING TIMER
   ============================================ */
.floating-timer {
    position: fixed;
    top: 80px;
    right: var(--space-5);
    width: 280px;
    background: var(--card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
    border: 2px solid var(--primary);
    overflow: hidden;
    animation: slide-in-right var(--transition-slow) var(--ease-out);
}

.timer-header {
    background: linear-gradient(135deg, var(--primary), oklch(0.4547 0.2103 297.0156));
    color: white;
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.timer-title {
    font-weight: 600;
    font-size: var(--text-sm);
}

.timer-minimize {
    background: oklch(1 0 0 / 0.2);
    border: none;
    color: white;
    font-size: var(--text-base);
    font-weight: 700;
    cursor: pointer;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast) var(--ease-out);
    line-height: 1;
}

.timer-minimize:hover {
    background: oklch(1 0 0 / 0.3);
}

.timer-body {
    padding: var(--space-5);
    text-align: center;
}

.floating-timer .timer-display {
    font-size: var(--text-3xl);
    margin: var(--space-2) 0;
}

.timer-status {
    color: var(--chart-3);
    font-weight: 600;
    margin-bottom: var(--space-4);
    font-size: var(--text-sm);
}

.timer-controls {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}

.btn-timer {
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition-fast) var(--ease-out);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.btn-pause {
    background: var(--chart-4);
    color: white;
}

.btn-pause:hover {
    background: oklch(0.6220 0.2041 42.4293);
    transform: translateY(-1px);
}

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

.btn-end:hover {
    background: oklch(0.4805 0.2155 19.8095);
    transform: translateY(-1px);
}

/* ============================================
   NOTIFICATIONS
   ============================================ */
.notification {
    position: fixed;
    top: var(--space-5);
    right: var(--space-5);
    background: var(--card);
    color: var(--foreground);
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    z-index: var(--z-toast);
    max-width: 380px;
    animation: slide-in-right var(--transition-slow) var(--ease-out);
    border-left: 4px solid var(--primary);
}

.notification.success {
    border-left-color: var(--chart-3);
}

.notification.error {
    border-left-color: var(--destructive);
}

.notification.warning {
    border-left-color: var(--chart-4);
}

.notification i {
    font-size: var(--text-lg);
}

.notification.success i {
    color: var(--chart-3);
}

.notification.error i {
    color: var(--destructive);
}

.notification__close {
    background: none;
    border: none;
    color: var(--muted-foreground);
    cursor: pointer;
    font-size: var(--text-lg);
    padding: 0;
    margin-left: auto;
    transition: color var(--transition-fast) var(--ease-out);
}

.notification__close:hover {
    color: var(--foreground);
}

/* Achievement Notification */
.achievement-notification {
    position: fixed;
    top: var(--space-5);
    right: var(--space-5);
    background: linear-gradient(135deg, var(--primary), oklch(0.6547 0.1803 297.0156));
    color: white;
    padding: var(--space-5);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-toast);
    max-width: 320px;
    animation: scale-in var(--transition-slow) var(--ease-spring);
}

.achievement-content {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.achievement-icon {
    font-size: var(--text-3xl);
    color: #ffd700;
}

.achievement-text h3 {
    margin: 0 0 var(--space-1) 0;
    font-size: var(--text-sm);
    opacity: 0.9;
}

.achievement-text h4 {
    margin: 0 0 var(--space-1) 0;
    font-size: var(--text-base);
    color: #ffd700;
}

.achievement-text p {
    margin: 0;
    font-size: var(--text-sm);
    opacity: 0.9;
    color: white;
}

/* ============================================
   FLASH MESSAGES / ALERTS
   ============================================ */
.flash-messages {
    margin-bottom: var(--space-5);
}

.alert {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.alert-info {
    background: oklch(0.6820 0.1448 235.3822 / 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
}

.alert-warning {
    background: oklch(0.6920 0.2041 42.4293 / 0.1);
    border: 1px solid var(--chart-4);
    color: var(--chart-4);
}

.alert-danger,
.alert-error {
    background: oklch(0.5505 0.2155 19.8095 / 0.1);
    border: 1px solid var(--destructive);
    color: var(--destructive);
}

.alert-success {
    background: oklch(0.6250 0.1772 140.4448 / 0.1);
    border: 1px solid var(--chart-3);
    color: var(--chart-3);
}

/* ============================================
   LOADING STATES
   ============================================ */
.loading {
    position: relative;
    opacity: 0.6;
    pointer-events: none;
}

.spinner,
.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--muted);
    border-top-color: var(--primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
    margin: var(--space-4) auto;
}

.loading-text {
    text-align: center;
    color: var(--muted-foreground);
    font-size: var(--text-sm);
}

/* ============================================
   ANALYTICS PAGE
   ============================================ */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-5);
}

.analytics-card {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
}

.analytics-card h3 {
    font-size: var(--text-base);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--foreground);
}

.progress-summary,
.study-time-analysis,
.weekly-breakdown,
.streaks-section {
    display: grid;
    gap: var(--space-3);
}

.progress-stat,
.time-stat,
.streak-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3);
    background: var(--muted);
    border-radius: var(--radius-md);
}

.stat-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--foreground);
}

.stat-value {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--primary);
}

.time-stat {
    flex-direction: column;
    text-align: center;
    padding: var(--space-4);
}

.time-stat .value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--chart-3);
    margin-bottom: var(--space-1);
}

.time-stat .label {
    font-size: var(--text-xs);
    color: var(--muted-foreground);
}

.streak-value {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--destructive);
}

/* Week Progress Item */
.week-progress-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3);
    background: var(--muted);
    border-radius: var(--radius-md);
}

.week-progress-item .week-number {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--text-sm);
    flex-shrink: 0;
}

.week-info {
    flex: 1;
}

.week-info .week-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: var(--space-2);
}

.week-progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.week-progress-fill {
    height: 100%;
    background: var(--chart-3);
    transition: width var(--transition-slow) var(--ease-out);
}

.week-percentage {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--muted-foreground);
    min-width: 40px;
    text-align: right;
}

/* Detailed Progress */
.detailed-progress,
.insights-section {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    margin-top: var(--space-6);
}

.detailed-progress h2,
.insights-section h2 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-6);
}

.week-detail-card {
    background: var(--muted);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    border-left: 4px solid var(--primary);
}

.week-detail-card h3 {
    font-size: var(--text-base);
    margin-bottom: var(--space-2);
}

.week-detail-card p {
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}

.week-detail-card .week-stats {
    display: flex;
    gap: var(--space-6);
    margin-bottom: var(--space-4);
}

.week-detail-card .stat {
    text-align: center;
}

.week-detail-card .stat-value {
    font-size: var(--text-xl);
}

.insight-item {
    padding: var(--space-4);
    background: var(--card);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
}

/* ============================================
   SESSION TYPE SELECTOR
   ============================================ */
.session-type-selector {
    text-align: left;
}

.session-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.session-option {
    display: flex;
    align-items: center;
    padding: var(--space-4);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
    background: var(--muted);
}

.session-option:hover {
    border-color: var(--primary);
    background: oklch(0.5547 0.2503 297.0156 / 0.05);
}

.session-option input[type="radio"] {
    margin-right: var(--space-3);
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.option-label {
    font-size: var(--text-base);
    font-weight: 500;
    flex: 1;
}

.option-description {
    font-size: var(--text-sm);
    color: var(--muted-foreground);
    margin-left: calc(18px + var(--space-3));
    margin-top: var(--space-1);
}

/* ============================================
   QUICK NAVIGATION
   ============================================ */
.quick-nav {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-6);
}

.quick-nav h3 {
    margin: 0 0 var(--space-4) 0;
    font-size: var(--text-base);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.quick-nav-buttons {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* ============================================
   CURRICULUM STATS
   ============================================ */
.curriculum-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-top: var(--space-6);
}

.curriculum-stats .stat-item {
    text-align: center;
    padding: var(--space-4) var(--space-6);
    background: var(--card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    min-width: 100px;
}

.curriculum-stats .stat-number {
    display: block;
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.curriculum-stats .stat-label {
    font-size: var(--text-xs);
    color: var(--muted-foreground);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

/* ============================================
   SESSIONS HISTORY
   ============================================ */
.sessions-history {
    background: var(--card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    margin-top: var(--space-6);
}

.sessions-history h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.session-item {
    background: var(--muted);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
}

.session-info {
    display: flex;
    gap: var(--space-4);
    align-items: center;
    flex-wrap: wrap;
}

.session-type {
    font-weight: 600;
    color: var(--primary);
}

.session-duration {
    background: var(--chart-3);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 500;
}

.session-date {
    color: var(--muted-foreground);
    font-size: var(--text-sm);
}

.session-notes {
    margin-top: var(--space-3);
    font-style: italic;
    color: var(--muted-foreground);
    font-size: var(--text-sm);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--space-2); }
.mt-2 { margin-top: var(--space-4); }
.mt-3 { margin-top: var(--space-6); }
.mb-1 { margin-bottom: var(--space-2); }
.mb-2 { margin-bottom: var(--space-4); }
.mb-3 { margin-bottom: var(--space-6); }
.hidden { display: none !important; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (768px and below) */
@media (max-width: 768px) {
    .main-content {
        padding: var(--space-4);
    }

    .nav-container {
        padding: var(--space-3) var(--space-4);
        flex-wrap: wrap;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card);
        border-top: 1px solid var(--border);
        flex-direction: column;
        padding: var(--space-4);
        gap: var(--space-1);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.show {
        display: flex;
    }

    .nav-menu a {
        width: 100%;
        padding: var(--space-3) var(--space-4);
    }

    .mobile-menu-toggle {
        display: block;
    }

    .nav-auth {
        display: none;
    }

    .nav-menu.show ~ .nav-auth,
    .nav-auth.show {
        display: flex;
        flex-direction: column;
        width: 100%;
        gap: var(--space-2);
        padding-top: var(--space-3);
        border-top: 1px solid var(--border);
    }

    h1 {
        font-size: var(--text-2xl);
    }

    h2 {
        font-size: var(--text-xl);
    }

    .dashboard-sections {
        grid-template-columns: 1fr;
    }

    .progress-cards {
        grid-template-columns: 1fr;
    }

    .days-grid {
        grid-template-columns: 1fr;
    }

    .day-navigation {
        flex-direction: column;
        text-align: center;
        gap: var(--space-4);
    }

    .day-navigation h1 {
        font-size: var(--text-xl);
        order: -1;
    }

    .day-progress-indicators {
        flex-wrap: wrap;
    }

    .progress-indicator {
        flex: 1;
        min-width: 100px;
    }

    .quick-nav-buttons {
        flex-direction: column;
    }

    .quick-actions {
        flex-direction: column;
    }

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

    .week-header {
        flex-direction: column;
        text-align: center;
        gap: var(--space-4);
    }

    .curriculum-stats {
        gap: var(--space-3);
    }

    .curriculum-stats .stat-item {
        min-width: 80px;
        padding: var(--space-3) var(--space-4);
    }

    .curriculum-stats .stat-number {
        font-size: var(--text-2xl);
    }

    .analytics-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile phones (480px and below) */
@media (max-width: 480px) {
    .main-content {
        padding: var(--space-3);
    }

    .progress-card {
        padding: var(--space-4);
    }

    .card-icon {
        width: 44px;
        height: 44px;
        font-size: var(--text-lg);
    }

    .modal-content {
        width: 95%;
        margin: 5vh auto;
        padding: var(--space-5);
    }

    .timer-display {
        font-size: var(--text-4xl);
    }

    .floating-timer {
        width: 240px;
        right: var(--space-3);
    }

    .floating-timer .timer-display {
        font-size: var(--text-2xl);
    }

    .btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-sm);
        min-height: 44px;
    }

    .session-controls {
        flex-direction: column;
        gap: var(--space-3);
    }

    .session-info {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .notification {
        left: var(--space-3);
        right: var(--space-3);
        max-width: none;
    }
}

/* Extra small devices (360px and below) */
@media (max-width: 360px) {
    .main-content {
        padding: var(--space-2);
    }

    h1 {
        font-size: var(--text-xl);
    }

    .nav-logo h2 {
        font-size: var(--text-base);
    }

    .curriculum-stats .stat-item {
        min-width: 70px;
        padding: var(--space-2) var(--space-3);
    }
}

/* Landscape orientation on mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .floating-timer {
        top: var(--space-3);
        right: var(--space-3);
    }

    .modal-content {
        margin: var(--space-4) auto;
        max-height: 90vh;
        overflow-y: auto;
    }
}

/* Print styles */
@media print {
    .navbar,
    .floating-timer,
    .quick-actions,
    .day-actions,
    .mobile-menu-toggle,
    .btn,
    .notification {
        display: none !important;
    }

    .main-content {
        max-width: 100%;
        padding: 0;
    }

    .progress-card,
    .day-card,
    .analytics-card {
        break-inside: avoid;
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* ============================================
   DARK MODE OVERRIDES
   ============================================ */
@media (prefers-color-scheme: dark) {
    .day-card.completed {
        background: oklch(0.2250 0.0372 140.4448 / 0.3);
    }

    .day-card.in-progress {
        background: oklch(0.2220 0.0341 42.4293 / 0.3);
    }

    .progress-indicator.completed {
        background: oklch(0.2250 0.0372 140.4448 / 0.3);
    }

    .claude-prompt {
        background: var(--card);
    }

    .modal {
        background: oklch(0 0 0 / 0.7);
    }

    .notification {
        box-shadow: var(--shadow-lg);
    }
}