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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --success-color: #10b981;
    --success-light: #6ee7b7;
    --danger-color: #ef4444;
    --danger-light: #fca5a5;
    --warning-color: #f59e0b;
    --warning-light: #fbbf24;
    --info-color: #3b82f6;
    --info-light: #93c5fd;
    
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --surface-color: #ffffff;
    --surface-hover: #f1f5f9;
    --text-color: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-color: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --border-light: #475569;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition-slow);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    box-shadow: var(--shadow);
}

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

.theme-toggle {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    background: var(--surface-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
    opacity: 0;
    transition: var(--transition);
}

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

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.study-controls {
    text-align: center;
    position: relative;
}

.study-mode-container {
    position: relative;
    display: inline-block;
    margin: 2rem 0;
}

.study-mode-toggle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    z-index: 2;
}

.study-mode-toggle::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--info-color), var(--success-color));
    z-index: -1;
    opacity: 0;
    transition: var(--transition);
}

.study-mode-toggle.inactive {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.study-mode-toggle.active {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    animation: studyPulse 2s infinite;
}

.study-mode-toggle.active::before {
    opacity: 1;
    animation: rotate 3s linear infinite;
}

@keyframes studyPulse {
    0%, 100% { transform: scale(1); box-shadow: var(--shadow-md); }
    50% { transform: scale(1.05); box-shadow: var(--shadow-xl); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.progress-ring {
    position: absolute;
    top: -10px;
    left: -10px;
    width: 160px;
    height: 160px;
    z-index: 1;
}

.progress-ring-circle {
    stroke: var(--primary-light);
    stroke-width: 4;
    fill: transparent;
    stroke-dasharray: 502;
    stroke-dashoffset: 502;
    transition: stroke-dashoffset 0.5s ease;
    filter: drop-shadow(0 0 6px var(--primary-color));
}

.timer-display {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 1.5rem 0;
    font-family: 'Inter', monospace;
    background: linear-gradient(135deg, var(--text-color), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition);
}

.timer-display.active {
    background: linear-gradient(135deg, var(--success-color), var(--info-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: timerGlow 2s ease-in-out infinite alternate;
}

@keyframes timerGlow {
    from { filter: brightness(1); }
    to { filter: brightness(1.2); }
}

.status-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin: 1rem 0;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.status-indicator {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    transition: var(--transition);
    position: relative;
}

.status-indicator::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border-radius: 50%;
    opacity: 0;
    transition: var(--transition);
}

.status-indicator.focused {
    background: var(--success-color);
    box-shadow: 0 0 20px var(--success-color);
}

.status-indicator.focused::after {
    background: var(--success-color);
    opacity: 0.3;
    animation: statusPulse 2s infinite;
}

.status-indicator.distracted {
    background: var(--danger-color);
    box-shadow: 0 0 20px var(--danger-color);
}

.status-indicator.distracted::after {
    background: var(--danger-color);
    opacity: 0.3;
    animation: statusPulse 1s infinite;
}

.status-indicator.idle {
    background: var(--text-muted);
}

@keyframes statusPulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.5); opacity: 0.1; }
}

.status-text {
    font-weight: 500;
    color: var(--text-secondary);
}

.mic-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--text-muted);
    border: 1px solid var(--border-light);
}

.mic-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: var(--transition);
}

.mic-indicator.recording {
    background: var(--danger-color);
    box-shadow: 0 0 10px var(--danger-color);
    animation: micBlink 1s infinite;
}

.mic-indicator.ready {
    background: var(--success-color);
}

.mic-indicator.error {
    background: var(--danger-color);
}

@keyframes micBlink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0.3; }
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--surface-color), var(--bg-secondary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.activity-section {
    grid-column: 1 / -1;
}

.activity-log {
    max-height: 400px;
    overflow-y: auto;
    margin-top: 1rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.activity-log::-webkit-scrollbar {
    width: 6px;
}

.activity-log::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

.activity-log::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.activity-log::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.activity-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
    transition: var(--transition);
}

.activity-item:hover {
    background: var(--surface-hover);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-text {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.activity-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.activity-icon.start {
    background: var(--success-light);
    color: var(--success-color);
}

.activity-icon.stop {
    background: var(--danger-light);
    color: var(--danger-color);
}

.activity-icon.distraction {
    background: var(--warning-light);
    color: var(--warning-color);
}

.activity-icon.focus {
    background: var(--info-light);
    color: var(--info-color);
}

.activity-time {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
}

/* Alert Popup Styles */
.alert-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-slow);
}

.alert-overlay.show {
    opacity: 1;
    visibility: visible;
}

.alert-popup {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    padding: 3rem;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    transform: scale(0.8) translateY(20px);
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.alert-popup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--danger-color), var(--warning-color));
}

.alert-overlay.show .alert-popup {
    transform: scale(1) translateY(0);
}

.alert-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: alertBounce 0.6s ease-out;
}

@keyframes alertBounce {
    0% { transform: scale(0.3); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.alert-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--danger-color);
}

.alert-message {
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.6;
}

.alert-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-width: 120px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--surface-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    box-shadow: var(--shadow);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Charts Container */
.charts-section {
    grid-column: 1 / -1;
    margin-top: 2rem;
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 1.5rem;
}

.chart-container {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow);
    position: relative;
    height: 300px;
}

/* Notifications */
.notification {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transform: translateX(400px);
    transition: var(--transition-slow);
    max-width: 350px;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid var(--success-color);
}

.notification.error {
    border-left: 4px solid var(--danger-color);
}

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

/* Keyboard Shortcuts Help */
.shortcuts-help {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem;
    box-shadow: var(--shadow);
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.7;
    transition: var(--transition);
}

.shortcuts-help:hover {
    opacity: 1;
}

.shortcut {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.shortcut:last-child {
    margin-bottom: 0;
}

.key {
    background: var(--bg-secondary);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.75rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .timer-display {
        font-size: 2.5rem;
    }
    
    .study-mode-toggle {
        width: 120px;
        height: 120px;
        font-size: 1rem;
    }
    
    .progress-ring {
        width: 140px;
        height: 140px;
        top: -10px;
        left: -10px;
    }
    
    .alert-popup {
        padding: 2rem;
        margin: 1rem;
    }
    
    .alert-buttons {
        flex-direction: column;
    }
    
    .shortcuts-help {
        display: none;
    }
    
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-value {
        font-size: 2rem;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Focus States */
.btn:focus,
.theme-toggle:focus,
.study-mode-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-muted: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-muted: #ffffff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}