:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --accent-color: #9C27B0;
    --dark-bg: #1a1a1a;
    --light-bg: #f5f5f5;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --border-radius: 12px;
    --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--light-bg) 0%, var(--gray-100) 100%);
    color: var(--gray-800);
    line-height: 1.6;
    padding-bottom: 80px;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255,255,255,0.05) 10px,
        rgba(255,255,255,0.05) 20px
    );
    animation: shimmer 20s linear infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.section {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.section.active {
    display: block;
}

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

.welcome-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
    text-align: center;
    border: 3px solid transparent;
    background-clip: padding-box;
    position: relative;
}

.welcome-card::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    background: linear-gradient(45deg, var(--primary-color), var(--success-color), var(--warning-color), var(--accent-color));
    border-radius: var(--border-radius);
    z-index: -1;
}

.welcome-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    border: 2px dashed var(--primary-color);
}

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

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-600);
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.action-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    transition: all 0.6s ease;
    transform: translate(-50%, -50%);
}

.action-btn:hover::before {
    width: 300px;
    height: 300px;
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    box-shadow: 0 4px 15px rgba(33, 150, 243, 0.3);
}

.action-btn.secondary {
    background: linear-gradient(135deg, var(--success-color), var(--warning-color));
    color: white;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

.environment-controls {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.control-group {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border-left: 4px solid var(--primary-color);
}

.control-group h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.slider-container label {
    font-weight: 600;
    min-width: 140px;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background: var(--gray-200);
    outline: none;
    -webkit-appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.slider-container input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.noise-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.noise-btn {
    padding: 0.8rem;
    border: 2px solid var(--gray-300);
    background: var(--white);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.noise-btn:hover, .noise-btn.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.temperature-display {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

#temperatureValue {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.temperature-controls {
    display: flex;
    gap: 0.5rem;
}

.temperature-controls button {
    padding: 0.5rem 1rem;
    border: none;
    background: var(--gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.temperature-controls button:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.environment-presets {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.environment-presets h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.preset-btn {
    padding: 1rem;
    border: 2px dashed var(--gray-400);
    background: var(--gray-100);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}

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

.video-container {
    position: relative;
    background: var(--gray-900);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 2rem;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#videoPreview {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius);
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.7);
    color: white;
    font-size: 1.2rem;
}

.video-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.video-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    background: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.video-btn:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
}

.video-enhancements {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.video-enhancements h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.enhancement-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.enhancement-group label {
    font-weight: 600;
    min-width: 100px;
}

.enhancement-toggles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.toggle-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 50px;
    height: 26px;
    background: var(--gray-300);
    border-radius: 13px;
    margin-right: 0.5rem;
    transition: var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider {
    background: var(--primary-color);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.reset-btn {
    padding: 0.8rem 1.5rem;
    border: 2px solid var(--gray-400);
    background: transparent;
    color: var(--gray-600);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.reset-btn:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.video-tips {
    background: var(--gray-100);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--warning-color);
}

.video-tips h4 {
    color: var(--warning-color);
    margin-bottom: 1rem;
}

.video-tips ul {
    list-style: none;
    padding: 0;
}

.video-tips li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.video-tips li:last-child {
    border-bottom: none;
}

.timer-container {
    text-align: center;
    margin-bottom: 2rem;
}

.timer-display {
    margin-bottom: 2rem;
}

.time-circle {
    display: inline-block;
    width: 200px;
    height: 200px;
    border: 8px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--white);
    box-shadow: var(--box-shadow);
    position: relative;
    margin: 0 auto;
}

#timerDisplay {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
}

.timer-label {
    font-size: 1rem;
    color: var(--gray-600);
    margin-top: 0.5rem;
}

.timer-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.timer-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

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

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

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

.timer-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.timer-btn:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
}

.timer-settings {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.timer-settings h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.setting-group {
    margin-bottom: 1rem;
}

.setting-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.setting-group input[type="number"] {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.setting-group input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.session-history {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.session-history h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.session-list {
    max-height: 300px;
    overflow-y: auto;
}

.session-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    background: var(--gray-50);
}

.session-time {
    font-weight: bold;
    color: var(--primary-color);
}

.session-type {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.session-type.focus {
    background: var(--success-color);
    color: white;
}

.session-type.break {
    background: var(--warning-color);
    color: white;
}

.collaboration-tools {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.tool-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border-top: 4px solid var(--primary-color);
}

.tool-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.notes-container textarea {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition);
}

.notes-container textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.notes-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.task-input, .links-input, .meeting-input {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.task-input input, .links-input input, .meeting-input input {
    flex: 1;
    padding: 0.8rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
    min-width: 150px;
}

.task-input input:focus, .links-input input:focus, .meeting-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.add-btn {
    padding: 0.8rem 1rem;
    border: none;
    background: var(--success-color);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

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

.task-list, .links-list, .meetings-list {
    max-height: 300px;
    overflow-y: auto;
}

.task-item, .link-item, .meeting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    background: var(--gray-50);
    transition: var(--transition);
}

.task-item:hover, .link-item:hover, .meeting-item:hover {
    background: var(--gray-100);
    transform: translateX(5px);
}

.task-item.completed {
    opacity: 0.6;
    text-decoration: line-through;
}

.item-actions {
    display: flex;
    gap: 0.5rem;
}

.item-btn {
    padding: 0.3rem 0.6rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
}

.item-btn.complete {
    background: var(--success-color);
    color: white;
}

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

.item-btn:hover {
    transform: scale(1.1);
}

.integration-tools {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.integration-tools h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.integration-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.integration-btn {
    padding: 1rem;
    border: 2px solid var(--gray-300);
    background: var(--white);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.integration-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
    transform: translateY(-5px);
}

.integration-btn i {
    font-size: 1.5rem;
}

.boundaries-config {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.config-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border-left: 4px solid var(--accent-color);
}

.config-card h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.time-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.time-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.time-group input[type="time"] {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.save-btn {
    padding: 0.8rem 1.5rem;
    border: none;
    background: var(--success-color);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.dnd-controls, .dnd-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.goals-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.goal-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.goal-group input[type="number"] {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.current-status {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.current-status h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

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

.status-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    border: 2px dashed var(--accent-color);
}

.status-icon {
    font-size: 2rem;
}

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

.status-label {
    font-size: 0.9rem;
    color: var(--gray-600);
}

.status-value {
    font-weight: bold;
    color: var(--accent-color);
}

.boundary-alerts {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.boundary-alerts h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.alerts-list {
    max-height: 200px;
    overflow-y: auto;
}

.alert-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--warning-color);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    background: rgba(255, 193, 7, 0.1);
}

.alert-text {
    font-weight: 600;
    color: var(--warning-color);
}

.dismiss-btn {
    padding: 0.3rem 0.8rem;
    border: none;
    background: var(--warning-color);
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}

.faq-section {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin: 2rem 0;
}

.faq-section h2 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    border: none;
    background: var(--gray-100);
    text-align: left;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--gray-200);
}

.faq-question[aria-expanded="true"] {
    background: var(--primary-color);
    color: white;
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: bold;
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 1.5rem;
    background: var(--white);
    border-top: 1px solid var(--gray-300);
    animation: fadeIn 0.3s ease;
}

.faq-answer p {
    line-height: 1.6;
    color: var(--gray-700);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid var(--gray-300);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--gray-600);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    min-width: 60px;
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 600;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary-color);
    background: rgba(33, 150, 243, 0.1);
}

.empty-state {
    text-align: center;
    color: var(--gray-500);
    font-style: italic;
    padding: 2rem;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    border: 2px dashed var(--gray-300);
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--gray-600);
    font-size: 0.9rem;
    border-top: 1px solid var(--gray-300);
    margin-top: 2rem;
}

.action-btn.danger {
    background: linear-gradient(135deg, var(--danger-color), #d32f2f);
    color: white;
    box-shadow: 0 4px 15px rgba(244, 67, 54, 0.3);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .quick-stats {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
    
    .time-circle {
        width: 150px;
        height: 150px;
    }
    
    #timerDisplay {
        font-size: 2rem;
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .integration-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .task-input, .links-input, .meeting-input {
        flex-direction: column;
    }
    
    .task-input input, .links-input input, .meeting-input input {
        min-width: auto;
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
    
    .status-grid {
        grid-template-columns: 1fr;
    }
    
    .time-inputs, .goals-inputs {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    main {
        padding: 0.5rem;
    }
    
    .welcome-card, .tool-card, .config-card {
        padding: 1rem;
    }
    
    .faq-question {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .faq-answer {
        padding: 1rem;
    }
    
    .preset-buttons {
        grid-template-columns: 1fr;
    }
    
    .noise-controls {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .video-container {
        height: 200px;
    }
}