/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Mode Colors */
    --primary-color: #ff6b6b;
    --secondary-color: #4ecdc4;
    --accent-color: #45b7d1;
    --background-color: #ffffff;
    --surface-color: #f8f9fa;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #e9ecef;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.15);
    
    /* Timer Colors */
    --pomodoro-color: #ff6b6b;
    --short-break-color: #4ecdc4;
    --long-break-color: #45b7d1;
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --background-color: #1a1a1a;
    --surface-color: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.4);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 2.5rem;
}

.dark-mode-toggle {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.dark-mode-toggle:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    padding: 60px 0;
    text-align: center;
}

.timer-container {
    max-width: 600px;
    margin: 0 auto;
}

/* Timer Mode Buttons */
.timer-modes {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.mode-btn {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 15px 25px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 140px;
    justify-content: center;
}

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

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

.mode-btn[data-mode="short-break"].active {
    background: var(--short-break-color);
    border-color: var(--short-break-color);
}

.mode-btn[data-mode="long-break"].active {
    background: var(--long-break-color);
    border-color: var(--long-break-color);
}

/* Timer Display */
.timer-display {
    margin: 40px 0;
}

.time-circle {
    position: relative;
    display: inline-block;
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-circle {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dasharray 1s ease;
}

.time-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

/* Timer Controls */
.timer-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 40px 0;
}

.control-btn {
    background: var(--primary-color);
    border: none;
    border-radius: 50px;
    padding: 18px 35px;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 120px;
    justify-content: center;
}

.control-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.control-btn:active {
    transform: translateY(-1px);
}

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

.start-btn.pause {
    background: #f39c12;
}

/* Settings */
.settings-container {
    margin-top: 40px;
    position: relative;
}

.settings-toggle {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 12px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 auto;
}

.settings-toggle:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

.settings-panel {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    margin-top: 10px;
    box-shadow: var(--shadow);
    display: none;
    min-width: 300px;
    z-index: 100;
}

.settings-panel.active {
    display: block;
    animation: slideDown 0.3s ease;
}

.settings-panel h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.setting-item label {
    font-weight: 500;
    color: var(--text-primary);
}

.setting-item input {
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 8px 12px;
    width: 80px;
    text-align: center;
    color: var(--text-primary);
    font-size: 1rem;
}

.save-settings-btn {
    background: var(--primary-color);
    border: none;
    border-radius: 10px;
    padding: 12px 20px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s ease;
}

.save-settings-btn:hover {
    background: #ff5252;
    transform: translateY(-2px);
}

/* Content Section */
.content-section {
    padding: 80px 0;
    background: var(--surface-color);
}

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

.faq-item {
    background: var(--background-color);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.faq-item h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.5rem;
    font-weight: 600;
}

.faq-item p, .faq-item ol, .faq-item ul {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
}

.faq-item ol, .faq-item ul {
    padding-left: 20px;
}

.faq-item li {
    margin-bottom: 10px;
}

.features-list {
    list-style: none;
    padding: 0;
}

.features-list li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--surface-color);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.features-list li:hover {
    transform: translateX(10px);
}

.features-list i {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-top: 2px;
}

/* Footer */
.footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .timer-modes {
        flex-direction: column;
        align-items: center;
    }
    
    .mode-btn {
        width: 200px;
    }
    
    .time-text {
        font-size: 3rem;
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .control-btn {
        width: 200px;
    }
    
    .faq-item {
        padding: 25px;
    }
    
    .settings-panel {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 90%;
        max-width: 400px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.5rem;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .time-text {
        font-size: 2.5rem;
    }
    
    .progress-ring {
        width: 250px;
        height: 250px;
    }
}