:root {
    --tg-theme-bg-color: var(--tg-color-scheme-bg-color, #ffffff);
    --tg-theme-text-color: var(--tg-color-scheme-text-color, #000000);
    --tg-theme-hint-color: var(--tg-color-scheme-hint-color, #999999);
    --tg-theme-link-color: var(--tg-color-scheme-link-color, #2481cc);
    --tg-theme-button-color: var(--tg-color-scheme-button-color, #2481cc);
    --tg-theme-button-text-color: var(--tg-color-scheme-button-text-color, #ffffff);
    --tg-theme-secondary-bg-color: var(--tg-color-scheme-secondary-bg-color, #f1f1f1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    font-size: 16px;
    line-height: 1.4;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
}

.app-container {
    max-width: 100%;
    margin: 0;
    padding: 0;
}

header {
    background: linear-gradient(135deg, var(--tg-theme-button-color), #6a1b9a);
    color: var(--tg-theme-button-text-color);
    padding: 20px 16px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 4px;
}

header p {
    font-size: 14px;
    opacity: 0.9;
}

.search-container {
    padding: 16px;
    background-color: var(--tg-theme-bg-color);
    position: sticky;
    top: 80px;
    z-index: 99;
    border-bottom: 1px solid var(--tg-theme-secondary-bg-color);
}

#searchInput {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    font-size: 16px;
    background-color: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    outline: none;
    transition: all 0.2s ease;
}

#searchInput:focus {
    border-color: var(--tg-theme-button-color);
    box-shadow: 0 0 0 2px rgba(36, 129, 204, 0.2);
}

.alphabet-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 16px;
    background-color: var(--tg-theme-bg-color);
    border-bottom: 1px solid var(--tg-theme-secondary-bg-color);
}

.alphabet-btn {
    padding: 8px 12px;
    border: 1px solid var(--tg-theme-secondary-bg-color);
    border-radius: 20px;
    background-color: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 40px;
    text-align: center;
}

.alphabet-btn:hover,
.alphabet-btn.active {
    background-color: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
    border-color: var(--tg-theme-button-color);
}

.disease-list {
    padding: 0 16px 16px;
}

.disease-item {
    background-color: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.disease-item:hover {
    background-color: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.disease-name {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 4px;
}

.disease-preview {
    font-size: 14px;
    opacity: 0.8;
    line-height: 1.3;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--tg-theme-bg-color);
    margin: 5% auto;
    padding: 0;
    border-radius: 16px;
    width: 95%;
    max-width: 500px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.close-btn {
    position: absolute;
    right: 16px;
    top: 16px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: var(--tg-theme-hint-color);
    z-index: 1001;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--tg-theme-secondary-bg-color);
}

.close-btn:hover {
    background-color: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
}

#modalTitle {
    font-size: 20px;
    font-weight: 600;
    padding: 24px 24px 16px;
    color: var(--tg-theme-text-color);
    border-bottom: 1px solid var(--tg-theme-secondary-bg-color);
}

.cause-section,
.affirmation-section {
    padding: 20px 24px;
}

.cause-title,
.affirmation-title {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--tg-theme-button-color);
}

.cause-section p,
.affirmation-text {
    line-height: 1.5;
    font-size: 15px;
    color: var(--tg-theme-text-color);
}

.affirmation-text {
    background-color: var(--tg-theme-secondary-bg-color);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 16px;
    font-style: italic;
    border-left: 4px solid var(--tg-theme-button-color);
}

.action-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.action-btn {
    flex: 1;
    padding: 12px 16px;
    border: none;
    border-radius: 12px;
    background-color: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(36, 129, 204, 0.3);
}

.copy-msg {
    display: none;
    background-color: #4caf50;
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
    animation: fadeInOut 2s ease-in-out;
}

.loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--tg-theme-hint-color);
    font-size: 16px;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
}

@media (max-width: 480px) {
    .modal-content {
        margin: 2% auto;
        width: 98%;
        max-height: 95vh;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .alphabet-filter {
        padding: 12px;
    }
    
    .alphabet-btn {
        padding: 6px 10px;
        font-size: 13px;
    }
}