/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #22c55e;
    --success-hover: #16a34a;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --break-color: #10b981;
    --long-break-color: #06b6d4;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    text-align: center;
    padding: 30px 0;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.app-logo {
    width: 50px;
    height: 50px;
    border-radius: 12px;
}

.app-header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Section Styles */
section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow-md);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.section-icon {
    font-size: 1.5rem;
}

/* Timer Section */
.timer-section {
    text-align: center;
}

.timer-display {
    margin-bottom: 30px;
}

.timer-circle {
    position: relative;
    width: 250px;
    height: 250px;
    margin: 0 auto;
}

.timer-inner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 1;
}

.timer-time {
    font-size: 3.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    display: block;
}

.timer-label {
    font-size: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.timer-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 8;
}

.timer-progress {
    fill: none;
    stroke: var(--primary-color);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}

.timer-circle.break .timer-progress {
    stroke: var(--break-color);
}

.timer-circle.long-break .timer-progress {
    stroke: var(--long-break-color);
}

/* Timer Controls */
.timer-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

/* Session Info */
.session-info {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.session-stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-hover);
    transform: translateY(-2px);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover);
    transform: translateY(-2px);
}

.btn-text {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 16px;
}

.btn-text:hover:not(:disabled) {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.btn-icon {
    font-size: 0.875rem;
}

/* Settings Section */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.input-group {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.input-group input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px;
    text-align: center;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    width: 60px;
    outline: none;
}

.input-group input::-webkit-outer-spin-button,
.input-group input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-group input[type=number] {
    -moz-appearance: textfield;
}

.input-btn {
    background: var(--bg-secondary);
    border: none;
    color: var(--text-primary);
    padding: 12px 16px;
    font-size: 1.25rem;
    cursor: pointer;
    transition: background var(--transition-fast);
}

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

/* Toggle Settings */
.toggle-settings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.toggle-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.toggle-item label:first-child {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-secondary);
    border-radius: 28px;
    transition: var(--transition-normal);
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background: white;
    border-radius: 50%;
    transition: var(--transition-normal);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary-color);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

/* Task List Section */
.task-input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.task-input-container input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
}

.task-input-container input::placeholder {
    color: var(--text-muted);
}

.task-input-container input:focus {
    border-color: var(--primary-color);
}

.task-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.task-list {
    list-style: none;
    margin-bottom: 15px;
    max-height: 300px;
    overflow-y: auto;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    margin-bottom: 10px;
    transition: all var(--transition-fast);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-item:hover {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

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

.task-item.active-task {
    border-left: 4px solid var(--primary-color);
}

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

.task-checkbox:hover {
    border-color: var(--primary-color);
}

.task-checkbox.checked {
    background: var(--success-color);
    border-color: var(--success-color);
}

.task-checkbox.checked::after {
    content: "✓";
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.task-text {
    flex: 1;
    word-break: break-word;
}

.task-actions-btns {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.task-item:hover .task-actions-btns {
    opacity: 1;
}

.task-action-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 5px;
    font-size: 1rem;
    transition: color var(--transition-fast);
}

.task-action-btn:hover {
    color: var(--text-primary);
}

.task-action-btn.delete:hover {
    color: var(--danger-color);
}

.task-action-btn.set-active:hover {
    color: var(--primary-color);
}

.task-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.task-count {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Distraction Blocker Section */
.blocker-description {
    margin-bottom: 20px;
}

.blocker-description p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.blocker-input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.blocker-input-container input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
}

.blocker-input-container input::placeholder {
    color: var(--text-muted);
}

.blocker-input-container input:focus {
    border-color: var(--primary-color);
}

.blocked-sites-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    min-height: 40px;
}

.blocked-site-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    animation: slideIn 0.2s ease;
}

.blocked-site-tag .remove-site {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    padding: 0;
    transition: color var(--transition-fast);
}

.blocked-site-tag .remove-site:hover {
    color: var(--danger-color);
}

.blocker-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
}

.status-indicator.active {
    background: var(--success-color);
    box-shadow: 0 0 10px var(--success-color);
    animation: pulse 2s infinite;
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

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

/* Blocker Overlay */
.blocker-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.98);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.blocker-overlay.active {
    display: flex;
}

.blocker-overlay-content {
    text-align: center;
    padding: 40px;
}

.blocker-overlay-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.blocker-overlay-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.blocker-overlay-content .time-remaining {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 30px 0 20px;
    margin-top: auto;
}

.app-footer p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.app-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.app-footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    .app-container {
        padding: 15px;
    }

    .app-header h1 {
        font-size: 1.5rem;
    }

    .timer-circle {
        width: 200px;
        height: 200px;
    }

    .timer-time {
        font-size: 2.5rem;
    }

    .timer-label {
        font-size: 0.875rem;
    }

    .timer-controls {
        gap: 10px;
    }

    .btn {
        padding: 10px 18px;
        font-size: 0.9rem;
    }

    .session-info {
        gap: 20px;
    }

    .stat-value {
        font-size: 1.5rem;
    }

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

    .toggle-settings {
        grid-template-columns: 1fr;
    }

    section {
        padding: 20px;
    }

    .task-item:hover .task-actions-btns {
        opacity: 1;
    }

    .task-actions-btns {
        opacity: 1;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: 20px 0;
    }

    .logo-container {
        flex-direction: column;
        gap: 10px;
    }

    .timer-circle {
        width: 180px;
        height: 180px;
    }

    .timer-time {
        font-size: 2rem;
    }

    .timer-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .task-filters {
        justify-content: center;
    }

    .task-actions {
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
        text-align: center;
    }
}

/* Print Styles */
@media print {
    .timer-controls,
    .settings-section,
    .blocker-section,
    .task-input-container,
    .task-filters,
    .task-actions {
        display: none;
    }
}