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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(145deg, #f4f9ff 0%, #e9f0fc 100%);
    color: #0a2540;
    line-height: 1.6;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.badge {
    background: rgba(0, 112, 243, 0.12);
    color: #0070f3;
    padding: 6px 14px;
    border-radius: 40px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
}

.badge-daily {
    background: rgba(16, 185, 129, 0.12);
    color: #059669;
}

.btn-primary {
    background: #0070f3;
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(0, 112, 243, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.btn-primary:hover {
    background: #005bc1;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 112, 243, 0.3);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid #0070f3;
    color: #0070f3;
    padding: 10px 24px;
    border-radius: 40px;
    font-weight: 600;
    transition: 0.2s;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-outline:hover {
    background: #0070f310;
    transform: translateY(-1px);
}

.card {
    background: white;
    border-radius: 28px;
    padding: 28px 24px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.02), 0 2px 6px rgba(0, 45, 80, 0.05);
    transition: all 0.25s ease;
    border: 1px solid rgba(0, 112, 243, 0.08);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 30px -12px rgba(0, 112, 243, 0.15);
    border-color: rgba(0, 112, 243, 0.2);
}

h1, h2, h3 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.section-sub {
    color: #4a627a;
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
}

.grid-2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.grid-3col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-4col {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.platform-icon {
    font-size: 2.2rem;
    color: #0070f3;
    margin-bottom: 1rem;
}

.feature-icon {
    font-size: 1.8rem;
    background: #eff6ff;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 18px;
    color: #0070f3;
    margin-bottom: 1.2rem;
}

.article-card {
    background: white;
    border-radius: 24px;
    overflow: hidden;
    transition: 0.2s;
    box-shadow: 0 5px 12px rgba(0, 0, 0, 0.03);
    border: 1px solid #eef2f9;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 30px -12px rgba(0, 112, 243, 0.15);
    border-color: rgba(0, 112, 243, 0.2);
}

.article-img {
    height: 180px;
    background: linear-gradient(135deg, #d4e4fc, #e9f0fa);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #0070f3;
    font-size: 2.5rem;
    overflow: hidden;
}

.article-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.article-content {
    padding: 18px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-content h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-content p {
    color: #4a627a;
    font-size: 0.85rem;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.read-more-link {
    color: #0070f3;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    margin-top: 8px;
    transition: gap 0.2s;
    align-self: flex-start;
}

.read-more-link:hover {
    gap: 10px;
    text-decoration: underline;
}

.site-nav {
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #eef2ff;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    flex-wrap: wrap;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.nav-brand span {
    font-weight: 800;
    font-size: 1.7rem;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: #1f3a5f;
    font-weight: 500;
}

.nav-links a.active {
    color: #0070f3;
}

footer {
    background: #ffffffcc;
    backdrop-filter: blur(2px);
    border-top: 1px solid #e2edff;
    margin-top: 4rem;
    padding: 3rem 0 2rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    text-decoration: none;
    color: #2c4c74;
}

.hero-image {
    max-width: 100%;
    border-radius: 32px;
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.1);
}

.hero-image-container {
    text-align: center;
}

.download-card {
    background: linear-gradient(115deg, #ffffff, #f4faff);
}

.daily-tip-box {
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 20px;
    padding: 20px 24px;
    margin-bottom: 2rem;
}

.daily-tip-box h3 {
    color: #047857;
    font-size: 1rem;
    margin-bottom: 8px;
}

.daily-tip-box p {
    color: #065f46;
    font-size: 0.95rem;
}

.article-page {
    max-width: 820px;
    margin: 0 auto;
    padding: 40px 24px 60px;
}

.article-page h1 {
    font-size: 2.2rem;
    margin-bottom: 12px;
    line-height: 1.3;
}

.article-meta {
    color: #64748b;
    font-size: 0.9rem;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e2e8f0;
}

.article-body h2 {
    font-size: 1.4rem;
    margin: 28px 0 12px;
    color: #0f172a;
}

.article-body p {
    margin-bottom: 16px;
    color: #334155;
}

.article-body ul {
    margin: 12px 0 20px 24px;
    color: #334155;
}

.article-body li {
    margin-bottom: 8px;
}

.sitemap-list {
    list-style: none;
    padding: 0;
}

.sitemap-list li {
    margin-bottom: 12px;
}

.sitemap-list a {
    color: #0070f3;
    text-decoration: none;
    font-weight: 500;
}

.sitemap-list a:hover {
    text-decoration: underline;
}

@media (max-width: 900px) {
    .grid-4col,
    .grid-3col,
    .grid-2col {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .site-nav .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 16px;
        justify-content: center;
    }
}