* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

:root {
    /* Light Mode Colors */
    --primary: #4361ee;
    --primary-light: #4895ef;
    --secondary: #3f37c9;
    --accent: #f72585;
    --success: #4cc9f0;
    --warning: #f8961e;
    --dark: #1d3557;
    --darker: #14213d;
    --light: #f8f9fa;
    --gray: #6c757d;
    --card-bg: rgba(255, 255, 255, 0.1);
    --border-radius: 16px;
    --box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
    --high-priority: #ff6b6b;
    --medium-priority: #ffd166;
    --low-priority: #06d6a0;
    
    /* Theme Colors */
    --bg-primary: #14213d;
    --bg-secondary: #1d3557;
    --text-primary: #f8f9fa;
    --text-secondary: #6c757d;
    --card-bg-color: rgba(255, 255, 255, 0.1);
    --border-color: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(0, 0, 0, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.15);
}

/* Light Mode */
[data-theme='light'] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #e9ecef;
    --text-primary: #1d3557;
    --text-secondary: #495057;
    --card-bg-color: rgba(255, 255, 255, 0.9);
    --border-color: rgba(0, 0, 0, 0.1);
    --input-bg: rgba(255, 255, 255, 0.8);
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg-color);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 15px var(--shadow-color);
}

header {
    text-align: center;
    padding: 20px 0;
    margin-bottom: 20px;
}

.app-title {
    font-size: 2.5rem;
    background: linear-gradient(to right, var(--primary-light), var(--success));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 8px;
}

.app-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    flex: 1;
}

@media (max-width: 1000px) {
    .app-grid {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--card-bg-color);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.panel-title i {
    font-size: 1.5rem;
    color: var(--primary);
}

.panel-title h2 {
    font-size: 1.5rem;
}

.task-form, .goal-form {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.task-input, .goal-input, .time-input, .priority-select {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
    font-size: 1rem;
}

.task-input:focus, .goal-input:focus, .time-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.priority-select {
    flex-shrink: 0;
    width: 150px;
    cursor: pointer;
}

.add-btn {
    padding: 12px 20px;
    background-color: var(--primary);
    color: var(--light);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}

.add-btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.section-title {
    margin-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
    display: flex;
    align-items: center;
}

.section-title h3 {
    font-size: 1.2rem;
    font-weight: 500;
}

.task-list, .goal-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.task-item, .goal-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 15px;
    border-radius: 8px;
    background: var(--input-bg);
    transition: var(--transition);
    border: 1px solid transparent;
}

.task-item:hover, .goal-item:hover {
    border-color: var(--primary);
}

.task-text, .goal-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-wrap: break-word;
}

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

.task-timestamp, .goal-timestamp {
    font-size: 0.8rem;
    color: var(--gray);
    margin-top: 4px;
}

.task-actions, .goal-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.task-actions button, .goal-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 5px;
    border-radius: 5px;
}

.task-actions button:hover, .goal-actions button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--primary);
}

.task-item.high {
    border-left: 5px solid var(--high-priority);
}

.task-item.medium {
    border-left: 5px solid var(--medium-priority);
}

.task-item.low {
    border-left: 5px solid var(--low-priority);
}

.stats {
    display: flex;
    justify-content: space-between;
    text-align: center;
    margin-top: auto;
}

.stat-card {
    background: rgba(0, 0, 0, 0.1);
    padding: 10px;
    border-radius: 8px;
    flex: 1;
    margin: 0 5px;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--success);
}

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

.timer-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    background: rgba(0, 0, 0, 0.1);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.timer-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.timer-title i {
    color: var(--accent);
}

.timer-title h3 {
    font-size: 1.2rem;
}

.time-display {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--success);
    letter-spacing: 2px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
}

.time-input {
    width: 80px;
    text-align: center;
    -moz-appearance: textfield;
}

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

.time-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
    text-align: center;
    margin-top: 5px;
}

.timer-controls {
    display: flex;
    gap: 10px;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
}

.timer-btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    color: var(--light);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

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

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

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

.btn-primary:hover, .btn-danger:hover, .btn-success:hover {
    opacity: 0.8;
    transform: scale(1.05);
}

.motivation, .pro-tip {
    font-style: italic;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.motivation i, .pro-tip i {
    color: var(--warning);
}

.progress-container {
    height: 10px;
    width: 100%;
    background-color: var(--input-bg);
    border-radius: 5px;
    margin-top: 10px;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--success), var(--primary));
    border-radius: 5px;
    transition: width 0.5s ease;
}

.progress-text {
    text-align: center;
    margin-top: 5px;
    font-weight: 600;
}

.data-controls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
}

.data-btn {
    background-color: var(--primary);
    color: white;
    padding: 15px 30px;
    border-radius: 12px;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 200px;
    justify-content: center;
}

.data-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

.data-btn.export { background-color: var(--primary); }
.data-btn.import { background-color: var(--secondary); }
.data-btn.reset { background-color: var(--accent); }

footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    color: var(--gray);
    font-size: 0.9rem;
}

.notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(67, 97, 238, 0.9);
    color: white;
    padding: 15px 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: none;
    align-items: center;
    gap: 10px;
    z-index: 2000;
    font-weight: 500;
    transition: all 0.3s ease-in-out;
}

.notification.show {
    display: flex;
    animation: fadeInOut 3s forwards;
}

@keyframes fadeInOut {
    0% { opacity: 0; transform: translateX(-50%) translateY(20px); }
    10% { opacity: 1; transform: translateX(-50%) translateY(0); }
    90% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(20px); }
}

.notification i {
    font-size: 1.2rem;
}

.help-modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    padding-top: 60px;
}

.help-content {
    background: var(--card-bg-color);
    margin: 5% auto;
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 800px;
    position: relative;
    box-shadow: var(--box-shadow);
}

.help-content h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 2rem;
    color: var(--primary-light);
}

.help-content h3 {
    margin-top: 25px;
    margin-bottom: 10px;
    font-size: 1.5rem;
    color: var(--accent);
}

.help-content p {
    margin-bottom: 10px;
    line-height: 1.6;
    color: var(--text-primary);
}

.close-btn {
    color: var(--text-secondary);
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--accent);
}

/* Print Styles for PDF Export */
@media print {
    body {
        background: #fff;
        color: #000;
        padding: 0;
    }
    .container, .app-grid, .panel {
        display: block;
        width: 100%;
        margin: 0;
        box-shadow: none;
        padding: 0;
        border: none;
    }
    .panel-title, .task-form, .timer-card, .data-controls, footer, .theme-toggle, .help-modal, .notification {
        display: none;
    }
    .task-list, .goal-list {
        display: block;
        border-bottom: 1px solid #ccc;
        margin-bottom: 20px;
    }
    .task-item, .goal-item {
        background: #f0f0f0;
        margin-bottom: 10px;
    }
    .stats {
        display: none;
    }
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .app-grid {
        gap: 15px;
    }
    
    .panel {
        padding: 20px;
    }
    
    .app-title {
        font-size: 2.2rem;
    }
    
    .time-display {
        font-size: 2.8rem;
    }
    
    .input-group {
        gap: 10px;
    }
    
    .time-input {
        width: 70px;
        font-size: 1.1rem;
        padding: 12px;
    }
    
    .task-form, .goal-form {
        flex-direction: column;
    }
    
    .add-btn {
        justify-content: center;
        padding: 15px;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .data-controls {
        flex-direction: column;
    }
    
    .data-btn {
        min-width: auto;
    }
}