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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #b0d6f7;
    color: #333;
    line-height: 1.6;
    padding-bottom: 50px;
}

.container {
    max-width: 420px;
    margin: 0 auto;
    background: #b0d6f7;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

@media (min-width: 768px) {
    .container {
        max-width: 840px;
    }
    .cards-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .screenshot-item {
        width: 280px;
    }
}

.top-banner {
    background-color: #2088e8;
    color: #fff;
    padding: 12px 15px;
    text-align: center;
    font-size: 14px;
    font-weight: bold;
}

.header {
    background-color: #72b6ee;
    padding: 30px 20px;
    text-align: center;
    margin-bottom: 15px;
}

.logo {
    width: 80px;
    height: 80px;
    margin-bottom: 15px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.header h1 {
    color: #fff;
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 30px;
    background-color: #2088e8;
    color: #fff;
    text-decoration: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(32, 136, 232, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(32, 136, 232, 0.5);
}

.download-btn img {
    width: 24px;
    height: 24px;
}

.warning-banner {
    background-color: #72b6ee;
    padding: 15px 20px;
    margin: 0 15px 15px;
    border-radius: 12px;
    text-align: center;
    border: 2px solid #2088e8;
}

.warning-banner p {
    color: #dc3545;
    font-size: 16px;
    font-weight: bold;
    line-height: 1.8;
}

.section {
    background-color: #72b6ee;
    margin: 0 15px 15px;
    padding: 20px;
    border-radius: 12px;
}

.section-title {
    color: #fff;
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #2088e8;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.section-title-red {
    color: #dc3545;
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 15px;
    text-align: center;
}

.section p {
    color: #1a1a2e;
    font-size: 15px;
    margin-bottom: 12px;
    text-indent: 2em;
    line-height: 1.8;
}

.section ul {
    padding-left: 25px;
    margin-bottom: 15px;
}

.section li {
    color: #1a1a2e;
    font-size: 15px;
    margin-bottom: 8px;
    line-height: 1.7;
}

.install-subtitle {
    color: #fff;
    font-size: 16px;
    margin: 15px 0 10px;
}

.highlight-red {
    color: #dc3545;
    font-weight: bold;
}

.accordion {
    background-color: #5aa3dd;
    color: #fff;
    cursor: pointer;
    padding: 15px;
    width: 100%;
    text-align: left;
    border: none;
    outline: none;
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 5px;
    border-radius: 8px;
    transition: background-color 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion:hover {
    background-color: #4a93cd;
}

.accordion.active {
    background-color: #3a83bd;
}

.accordion::after {
    content: '▼';
    font-size: 12px;
    transition: transform 0.3s;
}

.accordion.active::after {
    transform: rotate(180deg);
}

.panel {
    padding: 0 15px;
    background-color: #6ab0ec;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    border-radius: 0 0 8px 8px;
    margin-bottom: 10px;
}

.panel.show {
    max-height: 500px;
    padding: 15px;
}

.panel p {
    color: #1a1a2e;
    font-size: 14px;
    margin-bottom: 10px;
    text-indent: 2em;
}

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

.panel li {
    color: #1a1a2e;
    font-size: 14px;
    margin-bottom: 6px;
}

.screenshot-grid {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 10px;
    scrollbar-width: auto;
    scrollbar-color: #2088e8 #72b6ee;
    white-space: nowrap;
}

.screenshot-grid::-webkit-scrollbar {
    height: 8px;
}

.screenshot-grid::-webkit-scrollbar-track {
    background: #72b6ee;
    border-radius: 4px;
}

.screenshot-grid::-webkit-scrollbar-thumb {
    background: #2088e8;
    border-radius: 4px;
}

.screenshot-grid::-webkit-scrollbar-thumb:hover {
    background: #1a78d8;
}

.screenshot-item {
    flex-shrink: 0;
    width: 200px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
}

.feature-list {
    counter-reset: item;
}

.feature-list li {
    counter-increment: item;
    margin-bottom: 12px;
    padding-left: 30px;
    position: relative;
}

.feature-list li::before {
    content: counter(item);
    position: absolute;
    left: 0;
    top: 0;
    width: 22px;
    height: 22px;
    background-color: #2088e8;
    color: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 22px;
    font-size: 13px;
    font-weight: bold;
}

.logo-section {
    background-color: #72b6ee;
    margin: 0 15px 15px;
    padding: 40px 20px;
    border-radius: 12px;
    text-align: center;
}

.logo-section .logo {
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
}

.logo-section h2 {
    color: #fff;
    font-size: 32px;
    font-weight: bold;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    padding: 0 15px;
    margin-bottom: 15px;
}

.card {
    background-color: #72b6ee;
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.card-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 10px;
    background-color: #2088e8;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
}

.card h3 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 8px;
    font-weight: bold;
}

.card p {
    color: #1a1a2e;
    font-size: 13px;
    margin-bottom: 12px;
    line-height: 1.5;
    text-indent: 0;
}

.card-btn {
    display: inline-block;
    padding: 6px 16px;
    background-color: #2088e8;
    color: #fff;
    text-decoration: none;
    border-radius: 15px;
    font-size: 12px;
    font-weight: bold;
}

.card-btn:hover {
    background-color: #1a78d8;
}

.comment-section {
    background-color: #72b6ee;
    margin: 0 15px 15px;
    padding: 20px;
    border-radius: 12px;
}

.comment-section h2 {
    color: #fff;
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #2088e8;
}

.comment-input-area {
    margin-bottom: 20px;
}

.comment-input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #5aa3dd;
    border-radius: 8px;
    font-size: 14px;
    background-color: #fff;
    color: #333;
    resize: vertical;
    min-height: 60px;
    margin-bottom: 10px;
}

.comment-input:focus {
    outline: none;
    border-color: #2088e8;
}

.comment-btn {
    float: right;
    padding: 8px 24px;
    background-color: #2088e8;
    color: #fff;
    border: none;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
}

.comment-btn:hover {
    background-color: #1a78d8;
}

.comment-list {
    clear: both;
}

.comment-item {
    background-color: #6ab0ec;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.comment-username {
    color: #2088e8;
    font-weight: bold;
    font-size: 14px;
}

.comment-time {
    color: #666;
    font-size: 12px;
}

.comment-content {
    color: #1a1a2e;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 8px;
}

.comment-reply {
    color: #2088e8;
    font-size: 12px;
    text-decoration: none;
}

.comment-reply:hover {
    text-decoration: underline;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}

.page-link {
    padding: 6px 14px;
    background-color: #5aa3dd;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
}

.page-link:hover, .page-link.active {
    background-color: #2088e8;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 12px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: #2088e8;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(32, 136, 232, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: #1a78d8;
}

@media (min-width: 768px) {
    .download-buttons {
        gap: 30px;
    }
}