:root {
    --primary-color: #2ecc71;
    --secondary-color: #27ae60;
    --background-color: #f5f6fa;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --border-color: #e8e8e8;
}

body {
    margin: 0;
    padding: 20px;
    font-family: Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
}

.page-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.title-container h1 {
    text-align: center;
    font-size: 2.5em;
    margin-bottom: 30px;
}

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

.app-name {
    color: var(--primary-color);
}

.initial-letter {
    font-size: 1.2em;
    font-weight: bold;
}

.intro {
    text-align: center;
    margin: 20px auto 40px;
    max-width: 800px;
    padding: 0 20px;
}

.intro-content {
    position: relative;
}

.intro-part-1 {
    margin-bottom: 20px;
}

.intro-part-2 {
    margin-bottom: 20px;
}

.expand-btn {
    display: none;
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 10px;
    font-size: 1.2em;
    margin: 10px auto;
    transition: transform 0.3s ease;
}

.expand-btn.expanded {
    transform: rotate(180deg);
}

.intro h2 {
    font-size: 1.4em;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.intro p {
    text-align: left;
    color: var(--text-color);
    line-height: 1.6;
    margin-bottom: 15px;
}

.signature {
    text-align: right;
    font-style: italic;
    color: var(--secondary-color);
    font-size: 1.1em;
    margin-top: 20px;
}

.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    padding: 20px 0;
}

.modal-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: var(--card-background);
    margin: 15% auto;
    padding: 20px;
    border-radius: 10px;
    max-width: 400px;
    position: relative;
    overflow: hidden;
}

.close {
    position: absolute;
    right: 20px;
    top: 10px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-color);
}

.form-group {
    margin-bottom: 0;
}

.form-group label {
    display: none;
}

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.submit-btn.unavailable {
    background-color: #dc3545;
}

.submit-btn:not(:disabled):hover {
    background-color: var(--secondary-color);
}

.modal-content h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-right: 30px;
    font-size: 1.2em;
}

.form-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: #f8f9fa;
    color: var(--text-color);
    font-weight: bold;
}

.form-group select:disabled {
    opacity: 1;
    -webkit-text-fill-color: var(--text-color);
    color: var(--text-color);
}

.bottom-menu {
    text-align: center;
    margin-bottom: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
    padding: 0 10px;
    width: 100%;
    box-sizing: border-box;
}

.show-reservations-btn, .show-list-btn, .show-ad-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    white-space: nowrap;
    height: 45px;
    box-sizing: border-box;
}

.show-reservations-btn:hover, .show-list-btn:hover, .show-ad-btn:hover {
    background-color: var(--secondary-color);
    transform: scale(1.02);
}

.show-reservations-btn i, .show-list-btn i, .show-ad-btn i {
    margin-right: 0;
}

.modal-large {
    max-width: 800px;
    width: 90%;
    height: auto;
    min-height: 500px;
    margin: 10vh auto !important;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
}

.error-message p {
    margin: 0;
    line-height: 1.5;
}

.error-details {
    font-size: 0.9em;
    margin-top: 5px;
    color: #721c24;
}

.copyright {
    text-align: center;
    color: var(--text-color);
    font-size: 0.9em;
    margin-top: 20px;
}

.copyright s {
    text-decoration: none;
    color: var(--primary-color);
}

.copyright:hover {
    color: var(--secondary-color);
}

.legal-notice {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    margin-top: 20px;
    font-size: 0.9em;
    line-height: 1.5;
}

.legal-notice p:first-child {
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--text-color);
}

.legal-notice p {
    margin: 0;
    color: #666;
}

.legal-notice p:last-child {
    margin-top: 10px;
}

.bottom-section {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.items-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-height: 70vh;
    overflow-y: auto;
    padding: 10px;
}

.items-list .category-title {
    color: var(--primary-color);
    font-size: 1.2em;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

.items-list .item-line {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-group {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 15px;
}

.show-ad-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    white-space: nowrap;
    height: 45px;
    box-sizing: border-box;
}

.show-ad-btn:hover {
    background-color: var(--secondary-color);
    transform: scale(1.02);
}

.ad-creator {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

.category-selector {
    margin-bottom: 15px;
}

.category-selector select {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: #f8f9fa;
    color: var(--text-color);
    font-weight: bold;
}

.items-selector {
    max-height: 300px;
    overflow-y: auto;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 5px;
}

.item-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
}

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

.ad-preview {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
}

.ad-preview h4 {
    color: var(--primary-color);
    margin: 0 0 15px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ad-preview textarea {
    width: 100%;
    min-height: 200px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    resize: vertical;
    font-family: Arial, sans-serif;
    line-height: 1.5;
    background-color: white;
}

.ad-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 5px 10px;
    font-size: 1.1em;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    color: var(--secondary-color);
    transform: scale(1.1);
}

.copy-btn i {
    margin-right: 5px;
}

@media (max-width: 768px) {
    .ad-creator {
        grid-template-columns: 1fr;
    }

    .ad-controls, .ad-preview {
        width: 100%;
    }

    .bottom-menu {
        grid-template-columns: 1fr;
    }

    .show-reservations-btn, .show-list-btn, .show-ad-btn {
        width: 100%;
        margin-bottom: 10px;
    }

    .intro-part-2 {
        display: none;
    }

    .intro-part-2.show {
        display: block;
    }

    .expand-btn {
        display: block;
    }
}

@media (max-width: 480px) {
    .bottom-menu {
        grid-template-columns: 1fr;
    }

    .show-reservations-btn, .show-list-btn, .show-ad-btn {
        width: 100%;
        margin-bottom: 10px;
    }
}