:root {
    --primary-color: #3ddc84;
    --primary-dark: #2bb673;
    --secondary-color: #667eea;
    --accent-color: #764ba2;
    --text-primary: #333;
    --text-secondary: #666;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #333;
    --border-color: #e9ecef;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --spacing-lg: 2rem;
}

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

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background: linear-gradient(135deg, #f6fff9 0%, #eef2ff 100%);
    line-height: 1.6;
}

.page-wrap {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 20px var(--shadow-light);
}

.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.9rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-weight: 700;
    color: var(--primary-dark);
    text-decoration: none;
    font-size: 1.2rem;
}

.top-links {
    display: flex;
    gap: 1.4rem;
    list-style: none;
}

.top-link {
    text-decoration: none;
    padding: 0.2rem 0;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.top-link:hover,
.top-link:focus {
    color: var(--primary-dark);
}

.top-link:hover::after,
.top-link:focus::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
}

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

.hero {
    margin: 2.2rem auto 1.6rem;
    padding: 2rem;
    border-radius: 18px;
    background: linear-gradient(120deg, #667eea, #764ba2);
    color: #fff;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.25);
}

.hero h1 {
    font-size: clamp(1.7rem, 3.5vw, 2.5rem);
    margin-bottom: 0.5rem;
}

.hero p {
    opacity: 0.95;
}

.notice {
    margin: 0.2rem auto 1.5rem;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    padding: 0.95rem 1rem;
    border-radius: 10px;
    color: var(--text-secondary);
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin: 0 auto 2.5rem;
}

.app-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 24px var(--shadow-light);
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.app-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px var(--shadow-medium);
}

.app-card-head {
    display: flex;
    gap: 0.8rem;
    align-items: center;
}

.app-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    object-fit: contain;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.app-title {
    font-size: 1.15rem;
    margin-bottom: 0.1rem;
}

.app-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.button-row {
    margin-top: auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    text-decoration: none;
    border-radius: 9px;
    padding: 0.6rem 0.85rem;
    font-size: 0.92rem;
    font-weight: 700;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--primary-dark);
}

.btn-secondary {
    background: #fff;
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-secondary:hover,
.btn-secondary:focus {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

.versions {
    list-style: none;
    display: grid;
    gap: 0.6rem;
    margin: 0.4rem 0 0.9rem;
}

.versions li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.7rem;
    border: 1px solid var(--border-color);
    background: #fff;
    border-radius: 10px;
    padding: 0.65rem 0.8rem;
}

.version-label {
    font-weight: 700;
}

.muted {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer {
    margin-top: auto;
    padding: 0;
    background: var(--bg-dark);
    color: #fff;
}

.footer-bottom {
    padding: 1rem 0;
    text-align: center;
    color: rgba(255, 255, 255, 0.82);
    font-size: 0.9rem;
}

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

@media (max-width: 640px) {
    .topbar-inner {
        padding: 0.8rem 1rem;
    }

    .top-links {
        gap: 0.9rem;
    }

    .hero {
        padding: 1.2rem;
    }

    .versions li {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn {
        width: 100%;
    }
}