:root {
    --primary-color: #84cc16;
    --primary-hover: #65a30d;
    --primary-light: #d9f99d;
    --bg-color: #f7fee7;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --success-color: #16a34a;
    --success-bg: #dcfce7;
    --error-color: #ef4444;
    --error-bg: #fee2e2;
    --warning-color: #facc15;
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    --shadow-soft: 0 10px 25px -5px rgba(132, 204, 22, 0.1), 0 8px 10px -6px rgba(132, 204, 22, 0.1);
    --shadow-btn: 0 4px 6px -1px rgba(132, 204, 22, 0.2), 0 2px 4px -2px rgba(132, 204, 22, 0.2);
    --transition-fast: 0.2s ease;
    --transition-bounce: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

body {
    font-family: 'Nunito', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background-image: radial-gradient(circle at 10% 20%, rgba(217, 249, 157, 0.4) 0%, transparent 20%), 
                      radial-gradient(circle at 90% 80%, rgba(217, 249, 157, 0.4) 0%, transparent 20%);
}

#app-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 10px;
}

.header-titles h1 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-hover);
    margin-bottom: 4px;
}

.subtitle {
    font-family: 'Noto Sans Bengali', sans-serif;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.stats-bar {
    display: flex;
    justify-content: space-around;
    background: var(--card-bg);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-soft);
    margin: 20px 0;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-main);
}

.streak-value {
    color: #f97316;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.controls label {
    font-weight: 700;
    color: var(--text-muted);
}

.controls select {
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--primary-light);
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    color: var(--text-main);
    background-color: var(--card-bg);
    outline: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.controls select:focus {
    border-color: var(--primary-color);
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--primary-light);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 10px;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.5s ease;
}

/* Card General */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 30px;
    position: relative;
    overflow: hidden;
    animation: slideUp 0.4s ease forwards;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.badge {
    background-color: var(--primary-light);
    color: var(--primary-hover);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
}

.icon-btn:hover {
    background-color: var(--bg-color);
    color: var(--warning-color);
}

.hint-box {
    background-color: #fffbeb;
    border-left: 4px solid var(--warning-color);
    padding: 12px 16px;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    margin-bottom: 20px;
    font-family: 'Noto Sans Bengali', sans-serif;
    font-size: 0.95rem;
    color: #b45309;
    animation: fadeIn 0.3s ease;
}

/* Quiz Area */
.question-area {
    text-align: center;
    margin: 30px 0;
}

.bangla-text {
    font-family: 'Noto Sans Bengali', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.4;
}

.input-area {
    margin-bottom: 25px;
}

.input-area input {
    width: 100%;
    padding: 18px 20px;
    font-size: 1.2rem;
    font-family: 'Nunito', sans-serif;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius-md);
    outline: none;
    transition: var(--transition-fast);
    color: var(--text-main);
    background-color: #f9fafb;
}

.input-area input:focus {
    border-color: var(--primary-color);
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(132, 204, 22, 0.1);
}

.input-area input::placeholder {
    color: #9ca3af;
}

/* Buttons */
.actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.primary-btn {
    width: 100%;
    padding: 16px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 1.2rem;
    font-weight: 800;
    font-family: 'Nunito', sans-serif;
    cursor: pointer;
    box-shadow: var(--shadow-btn);
    transition: var(--transition-bounce);
}

.primary-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -2px rgba(132, 204, 22, 0.3);
}

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

.secondary-btn {
    width: 100%;
    padding: 14px;
    background-color: white;
    color: var(--text-muted);
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius-md);
    font-size: 1.1rem;
    font-weight: 700;
    font-family: 'Nunito', sans-serif;
    cursor: pointer;
    transition: var(--transition-fast);
}

.secondary-btn:hover {
    border-color: var(--primary-light);
    color: var(--text-main);
    background-color: var(--bg-color);
}

.btn-small {
    width: auto;
    padding: 8px 16px;
    font-size: 0.9rem;
    border-radius: var(--border-radius-sm);
}

/* Feedback Area */
.feedback-box {
    margin-top: 25px;
    padding: 20px;
    border-radius: var(--border-radius-md);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.feedback-box.correct {
    background-color: var(--success-bg);
    border: 2px solid var(--success-color);
}

.feedback-box.incorrect {
    background-color: var(--error-bg);
    border: 2px solid var(--error-color);
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.feedback-icon {
    font-size: 1.5rem;
}

.feedback-box.correct h3 {
    color: var(--success-color);
    font-size: 1.4rem;
}

.feedback-box.incorrect h3 {
    color: var(--error-color);
    font-size: 1.4rem;
}

.feedback-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.label {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
}

.incorrect-text {
    color: var(--error-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.correct-text {
    color: var(--success-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.bangla-text-small {
    font-family: 'Noto Sans Bengali', sans-serif;
    font-size: 1rem;
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.6);
    padding: 12px;
    border-radius: var(--border-radius-sm);
}

.feedback-actions {
    display: flex;
    gap: 10px;
}

/* Result Screen */
.result-header {
    text-align: center;
    margin-bottom: 30px;
}

.result-header h2 {
    font-size: 2rem;
    color: var(--primary-hover);
}

.result-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 30px;
}

.result-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background-color: var(--bg-color);
    border: 8px solid var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 20px rgba(132, 204, 22, 0.2);
}

.score-big {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-hover);
    line-height: 1;
}

.score-label {
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.9rem;
    margin-top: 5px;
}

.result-details p {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.result-details strong {
    font-size: 1.2rem;
}

.encouragement {
    text-align: center;
    margin-bottom: 30px;
    padding: 15px;
    background-color: var(--primary-light);
    border-radius: var(--border-radius-md);
}

.encouragement p {
    font-size: 1.3rem;
    color: var(--primary-hover);
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Toast */
#toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
}

.toast {
    background-color: var(--text-main);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: toastIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-20px); }
}

/* Controls additions */
.controls-actions {
    display: flex;
    gap: 8px;
}

/* Pattern Box */
.pattern-box {
    background-color: var(--primary-light);
    border: 2px dashed var(--primary-color);
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    margin: 0 auto 20px auto;
    max-width: 80%;
    text-align: left;
    font-size: 0.95rem;
    animation: fadeIn 0.3s ease;
}

.pattern-title {
    font-weight: 800;
    color: var(--primary-hover);
    margin-bottom: 2px;
    font-size: 0.85rem;
    text-transform: uppercase;
}

#pattern-text, #pattern-example {
    font-family: 'Nunito', sans-serif;
    color: var(--text-main);
    margin-bottom: 8px;
    font-weight: 600;
}
#pattern-example { margin-bottom: 0; }

/* Word Feedback */
.word-feedback {
    background-color: rgba(255, 255, 255, 0.7);
    border-left: 4px solid var(--warning-color);
    padding: 10px;
    margin-top: 10px;
    border-radius: 4px;
}

#word-feedback {
    font-family: 'Noto Sans Bengali', sans-serif;
    color: #92400e;
    font-size: 0.95rem;
    font-weight: 600;
}

/* Notebook */
.notebook-title {
    font-size: 1.6rem;
    color: var(--primary-hover);
    font-family: 'Noto Sans Bengali', sans-serif;
}

.mistakes-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 10px;
}

.mistake-card {
    background-color: #f9fafb;
    border: 1px solid #e5e7eb;
    border-left: 4px solid var(--error-color);
    padding: 15px;
    border-radius: var(--border-radius-sm);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mistake-card h4 {
    font-family: 'Noto Sans Bengali', sans-serif;
    font-size: 1.2rem;
    color: var(--text-main);
}

.mistake-detail {
    font-size: 0.95rem;
    color: var(--text-muted);
}
.mistake-detail strong {
    color: var(--text-main);
}

.warning-text {
    color: var(--warning-color);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 480px) {
    .card {
        padding: 20px;
    }
    .bangla-text {
        font-size: 1.5rem;
    }
    .result-stats {
        flex-direction: column;
        gap: 20px;
    }
    .stats-bar {
        padding: 10px;
    }
}