* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Noto Sans Devanagari', 'Mangal', 'Arial', sans-serif;
}

:root {
    --bg-color: #f5f7fa;
    --bg-gradient-start: #f5f7fa;
    --bg-gradient-end: #c3cfe2;
    --container-bg: white;
    --text-color: #333;
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --error-color: #ea4335;
    --border-color: #e0e0e0;
    --stat-bg: #f8f9fa;
    --button-bg: #f1f3f4;
    --input-bg: white;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --instructions-bg: #f8f9fa;
    --profile-bg: #e8f0fe;
    --easy-color: #34a853;
    --medium-color: #fbbc05;
    --hard-color: #ea4335;
    --warning-color: #ff9800;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --bg-gradient-start: #0f0f0f;
    --bg-gradient-end: #2d2d2d;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --primary-color: #5b9aff;
    --secondary-color: #4caf50;
    --error-color: #f44336;
    --border-color: #444;
    --stat-bg: #2d2d2d;
    --button-bg: #333;
    --input-bg: #2d2d2d;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --instructions-bg: #2d2d2d;
    --profile-bg: #2d3a4d;
    --easy-color: #4caf50;
    --medium-color: #ff9800;
    --hard-color: #f44336;
    --warning-color: #ffb74d;
}

body {
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    color: var(--text-color);
    transition: all var(--transition-speed) ease;
}

.main-container {
    display: flex;
    gap: 20px;
    max-width: 1300px;
    width: 100%;
}

.container {
    flex: 3;
    background-color: var(--container-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 30px;
    transition: all var(--transition-speed) ease;
}

.profile-sidebar {
    flex: 1;
    background-color: var(--container-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 25px;
    transition: all var(--transition-speed) ease;
    min-width: 300px;
    max-height: 800px;
    overflow-y: auto;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px 15px;
    background-color: var(--button-bg);
    border-radius: 20px;
    transition: all var(--transition-speed) ease;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.toggle-icon {
    font-size: 1.2rem;
}

.toggle-text {
    font-size: 0.9rem;
    font-weight: bold;
}

header {
    text-align: center;
    flex: 1;
}

h1 {
    color: var(--primary-color);
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-color);
    font-size: 1.1rem;
    opacity: 0.8;
}

.profile-title {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 20px;
    text-align: center;
}

.profile-form {
    background-color: var(--profile-bg);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 2px solid var(--border-color);
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

.form-group label {
    margin-bottom: 5px;
    font-weight: bold;
    color: var(--text-color);
}

.form-group input,
.form-group select {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.profile-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.profile-btn {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all var(--transition-speed);
    flex: 1;
    font-size: 0.9rem;
}

.profile-btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.profile-btn.delete {
    background-color: var(--error-color);
}

.profile-list {
    margin-top: 20px;
}

.profile-item {
    background-color: var(--stat-bg);
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 15px;
    border-left: 5px solid var(--primary-color);
    transition: all var(--transition-speed);
    cursor: pointer;
}

.profile-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.profile-item.active {
    border-left: 5px solid var(--secondary-color);
    background-color: var(--profile-bg);
}

.profile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.profile-item-name {
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--primary-color);
}

.profile-item-delete {
    background: none;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0 5px;
}

.profile-item-details {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

.empty-profiles {
    text-align: center;
    color: var(--text-color);
    opacity: 0.6;
    padding: 20px;
    font-style: italic;
}

.stats {
    display: flex;
    justify-content: space-between;
    background-color: var(--stat-bg);
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    transition: all var(--transition-speed) ease;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

.controls {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.practice-levels {
    display: flex;
    gap: 10px;
    flex: 1;
}

.level-btn {
    padding: 12px 20px;
    background-color: var(--button-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 1rem;
    font-family: 'Noto Sans Devanagari', 'Mangal', 'Arial', sans-serif;
    flex: 1;
    color: var(--text-color);
}

.level-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

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

.time-selection {
    display: flex;
    gap: 10px;
    flex: 1;
}

.time-btn {
    padding: 12px 15px;
    background-color: var(--button-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 1rem;
    font-family: 'Noto Sans Devanagari', 'Mangal', 'Arial', sans-serif;
    flex: 1;
    color: var(--text-color);
}

.time-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.time-btn.active {
    background-color: var(--secondary-color);
    color: white;
}

.difficulty-levels {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    display: none;
}

.difficulty-levels.active {
    display: flex;
}

.difficulty-btn {
    padding: 12px 20px;
    background-color: var(--button-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 1rem;
    font-family: 'Noto Sans Devanagari', 'Mangal', 'Arial', sans-serif;
    flex: 1;
    color: var(--text-color);
}

.difficulty-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.difficulty-btn.active {
    color: white;
}

.difficulty-btn.easy.active {
    background-color: var(--easy-color);
}

.difficulty-btn.medium.active {
    background-color: var(--medium-color);
}

.difficulty-btn.hard.active {
    background-color: var(--hard-color);
}

.difficulty-btn.easy {
    border-left: 5px solid var(--easy-color);
}

.difficulty-btn.medium {
    border-left: 5px solid var(--medium-color);
}

.difficulty-btn.hard {
    border-left: 5px solid var(--hard-color);
}

.practice-area {
    background-color: var(--stat-bg);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 2px solid var(--border-color);
    transition: all var(--transition-speed) ease;
}

.practice-text {
    font-size: 1.6rem;
    line-height: 1.8;
    margin-bottom: 20px;
    min-height: 150px;
    text-align: justify;
}

.current-char {
    background-color: var(--primary-color);
    color: white;
    padding: 2px 5px;
    border-radius: 3px;
    font-weight: bold;
}

.correct {
    color: var(--secondary-color);
}

.incorrect {
    color: var(--error-color);
    text-decoration: underline;
}

.input-area {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

#hindi-input {
    flex: 1;
    padding: 15px;
    font-size: 1.3rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    outline: none;
    transition: border-color 0.3s;
    font-family: 'Noto Sans Devanagari', 'Mangal', 'Arial', sans-serif;
    background-color: var(--input-bg);
    color: var(--text-color);
}

#hindi-input:focus {
    border-color: var(--primary-color);
}

#start-btn {
    padding: 15px 25px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-family: 'Noto Sans Devanagari', 'Mangal', 'Arial', sans-serif;
    min-width: 120px;
}

#start-btn:hover {
    background-color: var(--primary-color);
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

#start-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.progress-container {
    width: 100%;
    background-color: var(--button-bg);
    border-radius: 10px;
    margin: 15px 0;
    height: 10px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 10px;
    width: 0%;
    transition: width 0.3s;
}

.backspace-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    background-color: var(--button-bg);
    padding: 10px 15px;
    border-radius: 8px;
    margin-top: 10px;
}

.backspace-icon {
    font-size: 1.5rem;
    color: var(--warning-color);
}

.backspace-count {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--warning-color);
}

.backspace-label {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

.instructions {
    margin-top: 30px;
    background-color: var(--instructions-bg);
    padding: 20px;
    border-radius: 10px;
    transition: all var(--transition-speed) ease;
}

.instructions h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.instructions ul {
    padding-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
    line-height: 1.5;
}

footer {
    margin-top: 30px;
    text-align: center;
    color: var(--text-color);
    font-size: 0.9rem;
    opacity: 0.8;
    width: 100%;
}

/* Animation for typing effect */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.current-char {
    animation: blink 1s infinite;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-container {
        flex-direction: column;
    }
    
    .profile-sidebar {
        min-width: 100%;
        order: 1;
    }
    
    .container {
        order: 2;
    }
}

@media (max-width: 768px) {
    .container, .profile-sidebar {
        padding: 15px;
    }
    
    .header-container {
        flex-direction: column;
        text-align: center;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .practice-levels, .time-selection, .difficulty-levels {
        flex-direction: column;
    }
    
    .level-btn, .time-btn, .difficulty-btn {
        width: 100%;
    }
    
    .practice-text {
        font-size: 1.3rem;
    }
    
    .profile-buttons {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .container, .profile-sidebar {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .practice-text {
        font-size: 1.1rem;
    }
    
    #hindi-input {
        font-size: 1.1rem;
    }
}