/* Theme variables */
:root {
    /* Default theme (Classic) */
    --primary-color: #e74c3c;
    --primary-hover: #c0392b;
    --secondary-color: #f1f1f1;
    --secondary-hover: #e5e5e5;
    --text-color: #333;
    --text-light: #777;
    --text-lighter: #999;
    --container-bg: white;
    --page-bg: #f9f9f9;
    --border-color: #eee;
    --box-shadow: rgba(0, 0, 0, 0.1);
    --chart-color: rgba(231, 76, 60, 0.8);
    --chart-border: rgba(192, 57, 43, 1);
}

/* Dark theme */
[data-theme="dark"] {
    --primary-color: #ff5e57;
    --primary-hover: #ff3f36;
    --secondary-color: #454545;
    --secondary-hover: #555555;
    --text-color: #f0f0f0;
    --text-light: #bbbbbb;
    --text-lighter: #999999;
    --container-bg: #2d2d2d;
    --page-bg: #1a1a1a;
    --border-color: #444444;
    --box-shadow: rgba(0, 0, 0, 0.3);
    --chart-color: rgba(255, 94, 87, 0.8);
    --chart-border: rgba(255, 63, 54, 1);
}

/* Ocean theme */
[data-theme="ocean"] {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --secondary-color: #e3f2fd;
    --secondary-hover: #bbdefb;
    --text-color: #2c3e50;
    --text-light: #546e7a;
    --text-lighter: #78909c;
    --container-bg: white;
    --page-bg: #ecf0f1;
    --border-color: #d0e1f9;
    --box-shadow: rgba(52, 152, 219, 0.1);
    --chart-color: rgba(52, 152, 219, 0.8);
    --chart-border: rgba(41, 128, 185, 1);
}

/* Forest theme */
[data-theme="forest"] {
    --primary-color: #27ae60;
    --primary-hover: #219653;
    --secondary-color: #e8f5e9;
    --secondary-hover: #c8e6c9;
    --text-color: #1e3a24;
    --text-light: #4b7157;
    --text-lighter: #689f76;
    --container-bg: white;
    --page-bg: #f1f8e9;
    --border-color: #c8e6c9;
    --box-shadow: rgba(39, 174, 96, 0.1);
    --chart-color: rgba(39, 174, 96, 0.8);
    --chart-border: rgba(33, 150, 83, 1);
}

/* Purple theme */
[data-theme="purple"] {
    --primary-color: #9c27b0;
    --primary-hover: #7b1fa2;
    --secondary-color: #f3e5f5;
    --secondary-hover: #e1bee7;
    --text-color: #4a235a;
    --text-light: #7d3c98;
    --text-lighter: #a569bd;
    --container-bg: white;
    --page-bg: #f5eef8;
    --border-color: #e1bee7;
    --box-shadow: rgba(156, 39, 176, 0.1);
    --chart-color: rgba(156, 39, 176, 0.8);
    --chart-border: rgba(123, 31, 162, 1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--page-bg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

h1, h2, h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* Theme selector toggle */
.theme-selector-toggle {
    position: absolute;
    top: 0;
    right: 0;
}

/* Theme selector modal */
.theme-selector-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.theme-selector-modal.active {
    opacity: 1;
    visibility: visible;
}

.theme-selector-content {
    background-color: var(--container-bg);
    border-radius: 10px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 5px 15px var(--box-shadow);
    overflow: hidden;
}

.theme-selector-header {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.theme-selector-header h3 {
    margin-bottom: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-light);
    cursor: pointer;
}

.theme-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 15px;
    padding: 20px;
}

.theme-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    padding: 10px;
    border-radius: 5px;
    transition: all 0.2s ease;
}

.theme-option:hover {
    background-color: var(--secondary-color);
}

.theme-option.active {
    background-color: var(--secondary-color);
    box-shadow: 0 2px 5px var(--box-shadow);
}

.theme-preview {
    width: 60px;
    height: 60px;
    border-radius: 5px;
    margin-bottom: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}

.preview-color {
    width: 100%;
    height: 100%;
}

/* Theme preview colors for each theme */
/* Default theme preview */
.theme-option[data-theme="default"] .preview-color.primary {
    background-color: #e74c3c;
    grid-column: 1 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="default"] .preview-color.secondary {
    background-color: #f1f1f1;
    grid-column: 2 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="default"] .preview-color.background {
    background-color: #f9f9f9;
    grid-column: 1 / span 2;
    grid-row: 2 / span 1;
}

/* Dark theme preview */
.theme-option[data-theme="dark"] .preview-color.primary {
    background-color: #ff5e57;
    grid-column: 1 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="dark"] .preview-color.secondary {
    background-color: #454545;
    grid-column: 2 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="dark"] .preview-color.background {
    background-color: #1a1a1a;
    grid-column: 1 / span 2;
    grid-row: 2 / span 1;
}

/* Ocean theme preview */
.theme-option[data-theme="ocean"] .preview-color.primary {
    background-color: #3498db;
    grid-column: 1 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="ocean"] .preview-color.secondary {
    background-color: #e3f2fd;
    grid-column: 2 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="ocean"] .preview-color.background {
    background-color: #ecf0f1;
    grid-column: 1 / span 2;
    grid-row: 2 / span 1;
}

/* Forest theme preview */
.theme-option[data-theme="forest"] .preview-color.primary {
    background-color: #27ae60;
    grid-column: 1 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="forest"] .preview-color.secondary {
    background-color: #e8f5e9;
    grid-column: 2 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="forest"] .preview-color.background {
    background-color: #f1f8e9;
    grid-column: 1 / span 2;
    grid-row: 2 / span 1;
}

/* Purple theme preview */
.theme-option[data-theme="purple"] .preview-color.primary {
    background-color: #9c27b0;
    grid-column: 1 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="purple"] .preview-color.secondary {
    background-color: #f3e5f5;
    grid-column: 2 / span 1;
    grid-row: 1 / span 1;
}

.theme-option[data-theme="purple"] .preview-color.background {
    background-color: #f5eef8;
    grid-column: 1 / span 2;
    grid-row: 2 / span 1;
}

.theme-name {
    font-size: 0.9rem;
    color: var(--text-color);
}

/* Timer styles */
.timer-container {
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--box-shadow);
    padding: 30px;
    margin-bottom: 30px;
    text-align: center;
}

.timer-display {
    margin-bottom: 25px;
}

.timer-circle {
    width: 250px;
    height: 250px;
    margin: 0 auto;
    border-radius: 50%;
    background-color: var(--secondary-color);
    box-shadow: 0 0 0 10px var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    margin-bottom: 20px;
}

.timer-circle.large {
    width: 350px;
    height: 350px;
}

.timer-circle.large .timer-time {
    font-size: 5rem;
}

.timer-time {
    font-size: 3.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.timer-label {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-top: 5px;
}

.timer-progress-bar {
    width: 80%;
    height: 6px;
    background-color: var(--secondary-color);
    border-radius: 3px;
    margin: 0 auto;
    overflow: hidden;
}

.timer-progress {
    height: 100%;
    width: 0;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: width 1s linear;
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 25px;
}

.timer-settings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    text-align: left;
    margin-bottom: 25px;
}

.setting {
    display: flex;
    flex-direction: column;
}

.setting label {
    margin-bottom: 5px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.setting input {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    width: 100%;
    background-color: var(--container-bg);
    color: var(--text-color);
}

.unit {
    margin-left: 5px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Focus mode and ambient sound styles */
.focus-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    text-align: left;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.focus-mode-control {
    display: flex;
    align-items: center;
    justify-content: center;
}

.ambient-sound-control {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ambient-sound-control label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.sound-select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--container-bg);
    color: var(--text-color);
    font-size: 0.9rem;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.volume-control i {
    color: var(--text-light);
    font-size: 0.9rem;
}

.volume-control input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 5px;
    border-radius: 5px;
    background: var(--secondary-color);
    outline: none;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

/* Focus mode overlay */
.focus-mode-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.focus-mode-overlay.active {
    opacity: 1;
    visibility: visible;
}

.focus-timer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.focus-controls-minimal {
    display: flex;
    gap: 15px;
}

/* Button styles */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

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

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

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

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Tasks styles */
.tasks-container {
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--box-shadow);
    padding: 30px;
    margin-bottom: 30px;
}

.task-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.task-form input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--container-bg);
    color: var(--text-color);
}

.task-form button {
    padding: 10px 15px;
}

/* Task filters */
.task-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 5px;
}

.filter-group label {
    font-size: 0.9rem;
    color: var(--text-light);
}

.filter-group select {
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
    background-color: var(--container-bg);
    color: var(--text-color);
}

.task-list {
    list-style-type: none;
}

.task-list li {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-list li:last-child {
    border-bottom: none;
}

.task-list .task-text {
    flex: 1;
    color: var(--text-color);
}

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

.task-list .task-actions {
    display: flex;
    gap: 10px;
}

.task-list .task-actions button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-light);
    transition: color 0.3s ease;
}

.task-list .task-actions button:hover {
    color: var(--primary-color);
}

/* Stats styles */
.stats-container {
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--box-shadow);
    padding: 30px;
    margin-bottom: 30px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 20px;
    text-align: center;
    margin-bottom: 30px;
}

.stat-item {
    padding: 15px;
    border-radius: 5px;
    background-color: var(--secondary-color);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

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

/* History chart */
.history-stats {
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.history-stats h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.chart-container {
    width: 100%;
    height: 250px;
}

/* Footer styles */
footer {
    text-align: center;
    padding-top: 20px;
    color: var(--text-lighter);
    font-size: 0.9rem;
}

/* Responsive styles */
@media (max-width: 768px) {
    .timer-circle {
        width: 200px;
        height: 200px;
    }

    .timer-circle.large {
        width: 250px;
        height: 250px;
    }

    .timer-circle.large .timer-time {
        font-size: 3.5rem;
    }

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

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

    .focus-controls {
        grid-template-columns: 1fr;
    }

    .focus-mode-control {
        margin-bottom: 15px;
    }

    .btn {
        width: 100%;
        max-width: 200px;
    }

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

    .chart-container {
        height: 200px;
    }
    
    .theme-options {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Animation for timer when active */
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(var(--primary-color-rgb, 231, 76, 60), 0.4);
    }
    70% {
        box-shadow: 0 0 0 15px rgba(var(--primary-color-rgb, 231, 76, 60), 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(var(--primary-color-rgb, 231, 76, 60), 0);
    }
}

.timer-active .timer-circle {
    animation: pulse 2s infinite;
}