:root {
    /* Light Theme */
    --bg-color: #f4f4f9;
    --panel-bg: rgba(255, 255, 255, 0.7);
    --panel-border: rgba(255, 255, 255, 0.5);
    --text-color: #2b2b2b;
    --text-muted: #6b6b6b;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --stop-color: #ef4444;
    --stop-hover: #dc2626;
    --accent-color: #8b5cf6;
    --focus-word: #111827;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --panel-bg: rgba(30, 30, 30, 0.7);
    --panel-border: rgba(255, 255, 255, 0.1);
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --primary-color: #818cf8;
    --primary-hover: #6366f1;
    --stop-color: #f87171;
    --stop-hover: #ef4444;
    --accent-color: #a78bfa;
    --focus-word: #ffffff;
}

[data-theme="sepia"] {
    --bg-color: #f4ecd8;
    --panel-bg: rgba(244, 236, 216, 0.7);
    --panel-border: rgba(181, 160, 133, 0.3);
    --text-color: #5b4636;
    --text-muted: #8a7a6a;
    --primary-color: #d97736;
    --primary-hover: #c0632a;
    --stop-color: #a04040;
    --stop-hover: #803030;
    --accent-color: #9c6c4c;
    --focus-word: #3a2b20;
}

[data-theme="matrix"] {
    --bg-color: #000000;
    --panel-bg: rgba(0, 20, 0, 0.8);
    --panel-border: rgba(0, 255, 0, 0.3);
    --text-color: #00ff00;
    --text-muted: #008800;
    --primary-color: #00ff00;
    --primary-hover: #00cc00;
    --stop-color: #ff0000;
    --stop-hover: #cc0000;
    --accent-color: #00ff00;
    --focus-word: #00ff00;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.4s ease, color 0.4s ease;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

select {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--panel-border);
    background: var(--panel-bg);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    outline: none;
    cursor: pointer;
    backdrop-filter: blur(10px);
}

.setup-panel, .reading-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.hidden {
    display: none !important;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 600;
    color: var(--text-color);
}

textarea {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--panel-border);
    background: rgba(0,0,0,0.03);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s;
}

[data-theme="dark"] textarea,
[data-theme="matrix"] textarea {
    background: rgba(255,255,255,0.03);
}

textarea:focus {
    border-color: var(--primary-color);
}

.slider-container {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.slider-container label {
    font-weight: 600;
    display: flex;
    justify-content: space-between;
}

input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    margin-top: -8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: rgba(128,128,128,0.3);
    border-radius: 3px;
}

button {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

[data-theme="matrix"] .primary-btn {
    color: black;
}

.reader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.word-display-wrapper {
    height: 150px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

#word-display {
    font-size: 4rem;
    font-weight: 800;
    color: var(--focus-word);
    text-align: center;
    letter-spacing: -1px;
}

.progress-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.progress-bar {
    height: 8px;
    background-color: rgba(128,128,128,0.2);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: var(--progress, 0%);
    background-color: var(--primary-color);
    transition: width 0.1s linear;
}

.progress-text {
    text-align: right;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.reader-controls {
    display: flex;
    gap: 1rem;
    width: 100%;
}

.control-btn {
    flex: 1;
    background-color: var(--panel-bg);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

[data-theme="matrix"] .control-btn:hover {
    color: black;
}

.stop-btn {
    border-color: var(--stop-color);
    color: var(--stop-color);
}

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

/* Footer Styles */
.app-footer {
    text-align: center;
    margin-top: 1rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.separator {
    color: var(--text-muted);
    opacity: 0.5;
}