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

:root {
    --bg-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-card: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-hint: #999999;
    --input-bg: #f5f5f5;
    --input-border: #e0e0e0;
    --input-focus: #667eea;
    --input-correct: #e8f5e9;
    --input-correct-border: #4caf50;
    --input-incorrect: #ffebee;
    --input-incorrect-border: #f44336;
    --feedback-correct: #4caf50;
    --feedback-incorrect: #f44336;
    --progress-bg: #e0e0e0;
    --progress-fill: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --tag-bg: #e8eaf6;
    --tag-color: #667eea;
    --btn-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --btn-hover-shadow: rgba(102, 126, 234, 0.4);
    --word-list-border: #eeeeee;
    --word-item-correct: #4caf50;
    --word-item-incorrect: #f44336;
    --problem-mild-bg: #fff3e0;
    --problem-mild-color: #ff9800;
    --problem-severe-bg: #ffebee;
    --problem-severe-color: #f44336;
    --stats-bg: #f5f5f5;
    --shadow: rgba(0, 0, 0, 0.3);
    --trainer-card-bg: #f8f9fa;
    --trainer-card-border: #e0e0e0;
    --trainer-card-hover: #667eea;
    --vowel-btn-bg: #e8eaf6;
    --vowel-btn-border: #667eea;
    --vowel-btn-hover: #764ba2;
    --back-btn-bg: rgba(102, 126, 234, 0.1);
    --back-btn-color: #667eea;
}

body.dark-theme {
    --bg-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --bg-card: #1e1e2e;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-hint: #808080;
    --input-bg: #2a2a3e;
    --input-border: #3a3a4e;
    --input-focus: #8892b0;
    --input-correct: #1b3a2a;
    --input-correct-border: #4caf50;
    --input-incorrect: #3a1b1b;
    --input-incorrect-border: #f44336;
    --feedback-correct: #81c784;
    --feedback-incorrect: #e57373;
    --progress-bg: #2a2a3e;
    --progress-fill: linear-gradient(135deg, #64ffda 0%, #8892b0 100%);
    --tag-bg: #2a2a4e;
    --tag-color: #64ffda;
    --btn-gradient: linear-gradient(135deg, #64ffda 0%, #8892b0 100%);
    --btn-hover-shadow: rgba(100, 255, 218, 0.3);
    --word-list-border: #2a2a3e;
    --word-item-correct: #4caf50;
    --word-item-incorrect: #f44336;
    --problem-mild-bg: #3a2a1a;
    --problem-mild-color: #ff9800;
    --problem-severe-bg: #3a1a1a;
    --problem-severe-color: #f44336;
    --stats-bg: #2a2a3e;
    --shadow: rgba(0, 0, 0, 0.5);
    --trainer-card-bg: #2a2a3e;
    --trainer-card-border: #3a3a4e;
    --trainer-card-hover: #64ffda;
    --vowel-btn-bg: #2a2a4e;
    --vowel-btn-border: #64ffda;
    --vowel-btn-hover: #8892b0;
    --back-btn-bg: rgba(100, 255, 218, 0.1);
    --back-btn-color: #64ffda;
    --pre-pri-btn-bg: #2a2a4e;
    --pre-pri-btn-border: #64ffda;
    --pre-pri-btn-color: #e0e0e0;
    --pre-pri-btn-hover: #8892b0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: background 0.3s;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.container {
    background: var(--bg-card);
    border-radius: 20px;
    box-shadow: 0 20px 60px var(--shadow);
    max-width: 700px;
    width: 100%;
    padding: 40px;
    transition: background 0.3s, box-shadow 0.3s;
    overflow-x: hidden;
}

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

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 2em;
    transition: color 0.3s;
}

h2 {
    color: var(--text-primary);
    transition: color 0.3s;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1.1em;
    transition: color 0.3s;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border: 2px solid var(--input-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    transition: all 0.3s;
    box-shadow: 0 4px 15px var(--shadow);
    z-index: 1000;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.start-screen, .game-screen, .result-screen {
    display: none;
}

.start-screen.active, .game-screen.active, .result-screen.active {
    display: block;
}

.btn {
    background: var(--btn-gradient);
    color: #ffffff;
    border: none;
    padding: 15px 40px;
    font-size: 1.2em;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: block;
    margin: 20px auto;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px var(--btn-hover-shadow);
}

.btn:active {
    transform: translateY(0);
}

.progress-bar {
    background: var(--progress-bg);
    border-radius: 10px;
    height: 20px;
    margin-bottom: 20px;
    overflow: hidden;
    transition: background 0.3s;
}

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

.stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.word-display {
    text-align: center;
    font-size: 2.5em;
    margin: 40px 0 10px 0;
    letter-spacing: 5px;
    color: var(--text-primary);
    font-weight: bold;
    transition: color 0.3s;
}

.word-display .missing-letter {
    color: var(--feedback-incorrect);
    border-bottom: 3px solid var(--feedback-incorrect);
}

.word-hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1em;
    margin-bottom: 20px;
    min-height: 30px;
    font-style: italic;
    transition: color 0.3s;
}

.layout-warning {
    text-align: center;
    color: #ff9800;
    font-size: 1em;
    font-weight: bold;
    margin-bottom: 15px;
    min-height: 25px;
    opacity: 0;
    transform: translateY(-5px);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
}

.layout-warning.visible {
    opacity: 1;
    transform: translateY(0);
}

.input-group {
    margin: 30px 0;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 1.1em;
    transition: color 0.3s;
}

.input-group input {
    width: 100%;
    padding: 15px;
    font-size: 1.8em;
    border: 3px solid var(--input-border);
    border-radius: 10px;
    text-align: center;
    transition: border-color 0.3s, background 0.3s;
    background: var(--input-bg);
    color: var(--text-primary);
}

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

.input-group input.correct {
    border-color: var(--input-correct-border) !important;
    background: var(--input-correct) !important;
}

.input-group input.incorrect {
    border-color: var(--input-incorrect-border) !important;
    background: var(--input-incorrect) !important;
}

.feedback {
    text-align: center;
    margin-top: 15px;
    font-size: 1.3em;
    min-height: 35px;
    transition: color 0.3s;
}

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

.feedback.incorrect {
    color: var(--feedback-incorrect);
}

.results-summary {
    text-align: center;
    margin-bottom: 30px;
}

.score {
    font-size: 3em;
    color: var(--tag-color);
    margin: 20px 0;
    transition: color 0.3s;
}

.result-message {
    color: var(--text-secondary);
    font-size: 1.2em;
    margin-top: 10px;
    transition: color 0.3s;
}

.section {
    background: var(--stats-bg);
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    transition: background 0.3s;
}

.section h3 {
    color: var(--text-primary);
    margin-bottom: 15px;
    transition: color 0.3s;
}

.problem-letter {
    display: inline-block;
    padding: 8px 15px;
    border-radius: 20px;
    margin: 5px;
    font-weight: bold;
    font-size: 1.1em;
}

.problem-letter.mild {
    background: var(--problem-mild-bg);
    color: var(--problem-mild-color);
}

.problem-letter.severe {
    background: var(--problem-severe-bg);
    color: var(--problem-severe-color);
}

.stat-row {
    padding: 10px;
    border-bottom: 1px solid var(--word-list-border);
    display: flex;
    justify-content: space-between;
    transition: border-color 0.3s;
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-letter {
    font-weight: bold;
    color: var(--text-primary);
    transition: color 0.3s;
}

.stat-value {
    color: var(--text-secondary);
    transition: color 0.3s;
}

.word-list {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 20px;
}

.word-item {
    padding: 12px;
    border-bottom: 1px solid var(--word-list-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.3s;
}

.word-item:last-child {
    border-bottom: none;
}

.word-item.correct {
    border-left: 4px solid var(--word-item-correct);
}

.word-item.incorrect {
    border-left: 4px solid var(--word-item-incorrect);
}

.emoji {
    font-size: 4em;
    text-align: center;
    margin: 20px 0;
}

/* Main screen / trainer selection */
.main-screen {
    display: none;
}

.main-screen.active {
    display: block;
}

.trainer-selection {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin: 30px 0;
    flex-wrap: wrap;
}

.trainer-card {
    background: var(--trainer-card-bg);
    border: 2px solid var(--trainer-card-border);
    border-radius: 15px;
    padding: 30px 25px;
    cursor: pointer;
    transition: all 0.3s;
    flex: 1;
    min-width: 200px;
    max-width: 280px;
    text-align: center;
}

.trainer-card:hover {
    border-color: var(--trainer-card-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px var(--shadow);
}

.trainer-card-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.trainer-card-title {
    font-size: 1.3em;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 8px;
    transition: color 0.3s;
    text-align: center;
}

.trainer-card-desc {
    font-size: 0.95em;
    color: var(--text-secondary);
    transition: color 0.3s;
}

/* Back button */
.back-btn {
    background: var(--back-btn-bg);
    color: var(--back-btn-color);
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95em;
    margin-bottom: 15px;
    transition: all 0.3s;
}

.back-btn:hover {
    background: var(--trainer-card-hover);
    color: #ffffff;
}

/* Word display wrapper for centering */
.word-display-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
}

/* Vowel buttons inline in word */
.word-display {
    text-align: center;
    font-size: 2.5em;
    margin: 40px 0 10px 0;
    letter-spacing: 3px;
    color: var(--text-primary);
    font-weight: bold;
    transition: color 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 2px;
    line-height: 1.15;
    padding: 10px 0;
}

.consonant-char {
    display: inline-block;
    color: var(--text-primary);
    transition: color 0.3s;
}

.vowel-btn-inline {
    display: inline-block;
    background: #ffffff;
    border: 2px solid var(--vowel-btn-border);
    color: var(--text-primary);
    font-size: 1em;
    font-weight: bold;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    line-height: 1.2;
    min-height: 64px;
    min-width: 64px;
}

.vowel-btn-inline:hover:not(:disabled) {
    background: var(--vowel-btn-hover);
    color: #ffffff;
    border-color: var(--vowel-btn-hover);
    transform: scale(1.15);
}

.vowel-btn-inline:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.vowel-btn-inline.correct {
    background: var(--input-correct);
    border-color: var(--input-correct-border);
    color: var(--feedback-correct);
}

.vowel-btn-inline.correct-highlight {
    background: var(--input-correct);
    border-color: var(--input-correct-border);
    color: var(--feedback-correct);
    animation: pulse 0.5s;
}

.vowel-btn-inline.incorrect {
    background: var(--input-incorrect);
    border-color: var(--input-incorrect-border);
    color: var(--feedback-incorrect);
    animation: shake 0.3s;
}

/* Dark theme vowel buttons */
body.dark-theme .vowel-btn-inline {
    background: #2a2a3e;
    color: #e0e0e0;
}

/* PRE/PRI buttons for Task 10 */
.pre-pri-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin: 30px 0;
}

.pre-pri-btn {
    background: var(--pre-pri-btn-bg);
    border: 3px solid var(--pre-pri-btn-border);
    color: var(--pre-pri-btn-color);
    font-size: 2em;
    font-weight: bold;
    padding: 15px 40px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    min-width: 120px;
}

.pre-pri-btn:hover:not(:disabled) {
    background: var(--pre-pri-btn-hover);
    color: #ffffff;
    border-color: var(--pre-pri-btn-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow);
}

.pre-pri-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.pre-pri-btn.correct {
    background: var(--input-correct);
    border-color: var(--input-correct-border);
    color: var(--feedback-correct);
}

.pre-pri-btn.correct-highlight {
    background: var(--input-correct);
    border-color: var(--input-correct-border);
    color: var(--feedback-correct);
    animation: pulse 0.5s;
}

.pre-pri-btn.incorrect {
    background: var(--input-incorrect);
    border-color: var(--input-incorrect-border);
    color: var(--feedback-incorrect);
    animation: shake 0.3s;
}

/* Dark theme PRE/PRI buttons */
body.dark-theme .pre-pri-btn {
    background: var(--pre-pri-btn-bg);
    color: var(--pre-pri-btn-color);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.shake {
    animation: shake 0.3s;
}

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

.pulse {
    animation: pulse 0.3s;
}

.mode-selection {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin: 20px 0;
    flex-wrap: wrap;
}

.mode-btn {
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    color: var(--text-primary);
    padding: 15px 25px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1em;
    flex: 1;
    min-width: 150px;
}

.mode-btn:hover {
    border-color: var(--input-focus);
    transform: translateY(-2px);
}

.mode-btn.active {
    border-color: var(--input-focus);
    background: var(--tag-bg);
}

.mode-btn-title {
    font-size: 1.2em;
    font-weight: bold;
    display: block;
    margin-bottom: 5px;
}

.mode-btn-desc {
    font-size: 0.9em;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    body {
        padding: 10px;
        align-items: flex-start;
        padding-top: 60px;
        min-height: 100vh;
        min-height: 100dvh;
    }

    .container {
        padding: 20px;
        border-radius: 15px;
        max-width: 100%;
        min-height: calc(100vh - 80px);
        min-height: calc(100dvh - 80px);
        display: flex;
        flex-direction: column;
    }

    .game-screen.active {
        flex: 1;
        display: flex;
        flex-direction: column;
    }

    h1 {
        font-size: 1.5em;
        margin-bottom: 8px;
    }

    .subtitle {
        font-size: 0.95em;
        margin-bottom: 20px;
    }

    .theme-toggle {
        width: 45px;
        height: 45px;
        font-size: 1.3em;
        top: 10px;
        right: 10px;
    }

    .emoji {
        font-size: 3em;
        margin: 15px 0;
    }

    /* Trainer selection responsive */
    .trainer-selection {
        flex-direction: column;
        gap: 15px;
        margin: 20px 0;
    }

    .trainer-card {
        min-width: 100%;
        max-width: 100%;
        padding: 25px 20px;
    }

    .trainer-card-icon {
        font-size: 2.5em;
        margin-bottom: 10px;
    }

    .trainer-card-title {
        font-size: 1.2em;
    }

    .trainer-card-desc {
        font-size: 0.9em;
    }

    /* Back button responsive */
    .back-btn {
        padding: 8px 14px;
        font-size: 0.9em;
        margin-bottom: 10px;
    }

    /* Vowel buttons inline responsive */
    .vowel-btn-inline {
        font-size: 0.9em;
        padding: 6px 10px;
        min-height: 52px;
        min-width: 52px;
    }

    .consonant-char {
        font-size: 0.9em;
    }

    /* Mode selection responsive */
    .mode-selection {
        flex-direction: column;
        gap: 10px;
    }

    .mode-btn {
        min-width: 100%;
        padding: 15px 20px;
        margin: 0;
    }

    /* Word display responsive */
    .word-display {
        font-size: 2.2em;
        margin: 0;
        letter-spacing: 2px;
        padding: 5px 5px;
        line-height: 1.15;
        gap: 2px;
    }

    .word-display-wrapper {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 0;
    }

    .vowel-btn-inline {
        font-size: 0.8em;
        padding: 4px 6px;
        min-height: 48px;
        min-width: 48px;
    }

    .consonant-char {
        font-size: 1em;
    }

    .word-hint {
        font-size: 1em;
        margin-bottom: 15px;
    }

    .layout-warning {
        font-size: 0.95em;
        margin-bottom: 12px;
    }

    /* PRE/PRI buttons responsive */
    .pre-pri-buttons {
        flex-direction: column;
        gap: 12px;
        margin: 20px 0;
    }

    .pre-pri-btn {
        font-size: 1.5em;
        padding: 12px 30px;
        min-width: 100%;
        min-height: 56px;
    }

    /* Input responsive */
    .input-group {
        margin: 20px 0;
    }

    .input-group label {
        font-size: 1em;
        margin-bottom: 8px;
    }

    .input-group input {
        font-size: 1.8em;
        padding: 15px;
        -webkit-appearance: none;
        -moz-appearance: textfield;
        appearance: none;
    }

    /* Button responsive */
    .btn {
        padding: 14px 30px;
        font-size: 1.1em;
        margin: 15px auto;
        width: 100%;
        max-width: 100%;
        min-height: 48px;
        touch-action: manipulation;
    }

    /* Stats responsive */
    .stats {
        font-size: 0.9em;
        margin-bottom: 15px;
        flex-wrap: wrap;
        gap: 8px;
        justify-content: center;
    }

    .progress-bar {
        height: 18px;
        margin-bottom: 15px;
    }

    /* Feedback responsive */
    .feedback {
        font-size: 1.1em;
        margin-top: 10px;
        min-height: 30px;
    }

    /* Results responsive */
    .results-summary {
        margin-bottom: 20px;
    }

    .score {
        font-size: 2.5em;
        margin: 15px 0;
    }

    .result-message {
        font-size: 1em;
    }

    /* Word list responsive */
    .word-list {
        max-height: 250px;
        margin-top: 15px;
        -webkit-overflow-scrolling: touch;
    }

    .word-item {
        padding: 12px;
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .word-item span:first-child {
        font-size: 1.1em;
    }

    .word-item span:last-child {
        font-size: 0.9em;
    }

    /* Section responsive */
    .section {
        padding: 15px;
        margin: 15px 0;
    }

    .section h3 {
        font-size: 1.1em;
        margin-bottom: 10px;
    }

    /* Problem letter responsive */
    .problem-letter {
        padding: 8px 12px;
        font-size: 1em;
        margin: 3px;
    }

    /* Practice button responsive */
    #practiceErrorsStartBtn {
        width: 100%;
        max-width: 100%;
        font-size: 1.1em;
        padding: 14px 20px;
        margin-bottom: 15px;
        min-height: 48px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 5px;
        padding-top: 55px;
        min-height: 100vh;
        min-height: 100dvh;
    }

    .container {
        padding: 15px;
        border-radius: 10px;
        min-height: calc(100vh - 65px);
        min-height: calc(100dvh - 65px);
        display: flex;
        flex-direction: column;
    }

    .game-screen.active {
        flex: 1;
        display: flex;
        flex-direction: column;
    }

    h1 {
        font-size: 1.3em;
    }

    .subtitle {
        font-size: 0.9em;
        margin-bottom: 15px;
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 1.1em;
        top: 8px;
        right: 8px;
    }

    .emoji {
        font-size: 2.5em;
        margin: 10px 0;
    }

    /* Word display smaller */
    .word-display {
        font-size: 1.8em;
        margin: 0;
        letter-spacing: 1px;
        padding: 5px 5px;
        line-height: 1.15;
        gap: 2px;
    }

    .word-display-wrapper {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 0;
    }

    .vowel-btn-inline {
        font-size: 0.8em;
        padding: 4px 6px;
        min-height: 44px;
        min-width: 44px;
    }

    .consonant-char {
        font-size: 1em;
    }

    .word-hint {
        font-size: 0.95em;
        margin-bottom: 12px;
    }

    /* Input smaller */
    .input-group {
        margin: 15px 0;
    }

    .input-group label {
        font-size: 0.95em;
    }

    .input-group input {
        font-size: 1.6em;
        padding: 12px;
    }

    /* Button smaller */
    .btn {
        padding: 12px 25px;
        font-size: 1em;
        margin: 12px auto;
        min-height: 44px;
    }

    /* Stats smaller */
    .stats {
        font-size: 0.85em;
        margin-bottom: 10px;
        gap: 5px;
    }

    .progress-bar {
        height: 14px;
        margin-bottom: 10px;
    }

    /* Feedback smaller */
    .feedback {
        font-size: 1em;
        margin-top: 8px;
    }

    /* Results smaller */
    .score {
        font-size: 2em;
        margin: 10px 0;
    }

    .result-message {
        font-size: 0.9em;
    }

    /* Word list smaller */
    .word-list {
        max-height: 200px;
        margin-top: 10px;
    }

    .word-item {
        padding: 10px;
        gap: 5px;
    }

    .word-item span:first-child {
        font-size: 1em;
    }

    .word-item span:last-child {
        font-size: 0.85em;
    }

    /* Section smaller */
    .section {
        padding: 12px;
        margin: 10px 0;
    }

    .section h3 {
        font-size: 1em;
        margin-bottom: 8px;
    }

    /* Mode button smaller */
    .mode-btn {
        padding: 12px 15px;
        min-height: 44px;
    }

    .mode-btn-title {
        font-size: 1.1em;
    }

    .mode-btn-desc {
        font-size: 0.85em;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 44px;
    }

    .btn:active {
        transform: translateY(0);
        opacity: 0.9;
    }

    .mode-btn:active {
        transform: translateY(0);
        opacity: 0.9;
    }

    .theme-toggle:active {
        transform: scale(0.95);
    }

    .input-group input {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    /* Improve scrolling on mobile */
    .word-list {
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
    }

    /* Prevent text selection on buttons */
    .btn,
    .mode-btn,
    .theme-toggle {
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }
}

/* Safe area padding for devices with notches */
@supports (padding: max(0px)) {
    body {
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
    }

    @media (max-width: 768px) {
        body {
            padding-left: max(10px, env(safe-area-inset-left));
            padding-right: max(10px, env(safe-area-inset-right));
            padding-top: max(60px, env(safe-area-inset-top) + 10px);
        }
    }

    @media (max-width: 480px) {
        body {
            padding-left: max(5px, env(safe-area-inset-left));
            padding-right: max(5px, env(safe-area-inset-right));
            padding-top: max(55px, env(safe-area-inset-top) + 5px);
        }
    }
}