* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333;
    --hover-color: #2a2a2a;
    --active-color: #333;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

.container {
    width: 100%;
    max-width: 100%;
    margin: 0;
    background-color: var(--bg-color);
    padding: 2rem;
    min-height: 100vh;
}

h1 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.input-section {
    margin-bottom: 2rem;
}

textarea {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    resize: none;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-color);
    overflow: hidden;
    transition: height 0.2s ease-out;
}

textarea:focus {
    outline: none;
    border-color: #555;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.control-group {
    flex: 1;
    min-width: 150px;
}

.control-group label {
    color: var(--text-color);
    opacity: 0.9;
    display: block;
    margin-bottom: 0.5rem;
}

.control-group input {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.6rem;
    border-radius: 4px;
    width: 100%;
    font-size: 1rem;
}

.control-group input:focus {
    outline: none;
    border-color: #555;
}

.control-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: 500;
    color: #555;
}

.control-group input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

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

button {
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

#startBtn {
    background-color: #2ecc71;
    color: white;
}

#startBtn:hover {
    background-color: #27ae60;
}

#pauseResumeBtn {
    background-color: #3498db;
    color: white;
}

#pauseResumeBtn.paused {
    background-color: #e67e22;
}

#pauseResumeBtn:hover:not(:disabled) {
    background-color: #2980b9;
}

#pauseResumeBtn.paused:hover:not(:disabled) {
    background-color: #d35400;
}

#resetBtn {
    background-color: #e74c3c;
    color: white;
}

#resetBtn:hover:not(:disabled) {
    background-color: #c0392b;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Removed display styles as preview is no longer needed on main page */

/* Buttons */
.buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 0 1.5rem;
}

button {
    padding: 0.8rem 1.8rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    background-color: var(--surface-color);
    color: var(--text-color);
}

button:hover:not(:disabled) {
    background-color: var(--hover-color);
}

button:active:not(:disabled) {
    background-color: var(--active-color);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#startBtn {
    background-color: #2c3e50;
    color: white;
}

#startBtn:hover:not(:disabled) {
    background-color: #34495e;
}

#pauseResumeBtn {
    background-color: #2980b9;
    color: white;
}

#pauseResumeBtn.paused {
    background-color: #e67e22;
}

#resetBtn {
    background-color: #7f8c8d;
    color: white;
}

.stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-top: 1.5rem;
}

.stat {
    text-align: center;
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: 5px;
    border: 1px solid var(--border-color);
    min-width: 150px;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: #aaa;
    margin-bottom: 0.5rem;
}

.stat span:not(.stat-label) {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-color);
}

/* Full-screen reading overlay */
.reading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 2rem;
    box-sizing: border-box;
    text-align: center;
}

/* Waterfall effect */
.waterfall-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.waterfall-line {
    display: flex;
    justify-content: center;
    width: 100%;
    margin: 0.1rem 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.waterfall-line.past {
    opacity: 0.5;
    transform: scale(0.9);
    color: #aaa;
}

.waterfall-line.future {
    opacity: 0.5;
    transform: scale(0.9);
    color: #888;
}

.waterfall-line.current {
    font-size: 1.5em;
    margin: 1rem 0;
    padding: 0.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    min-height: 2em;
}

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

.reading-content {
    font-size: 5rem; /* Default size, will be overridden by JS */
    font-weight: bold;
    text-align: center;
    max-width: 90%;
    margin: 0 auto 2rem;
    line-height: 1.3;
    color: var(--text-color);
    transition: font-size 0.2s ease;
}

.reading-controls {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: rgba(30, 30, 30, 0.95);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--border-color);
}

.reading-speed, .reading-progress {
    font-size: 1rem;
    color: #aaa;
    font-weight: 500;
}

.close-button {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #aaa;
    padding: 0 1rem;
    line-height: 1;
    transition: color 0.2s;
}

.close-button:hover {
    color: #fff;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .control-group {
        width: 100%;
    }
    
    .display {
        font-size: 1.5rem;
        min-height: 150px;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
    
    .reading-content {
        font-size: 3rem;
    }
    
    .reading-controls {
        flex-direction: column;
        gap: 0.5rem;
    }
}