/* Biashara Guide — Clean, fast, mobile-first */
:root {
    --primary: #1a73e8;
    --dark: #1f2937;
    --gray: #6b7280;
    --light: #f3f4f6;
    --white: #ffffff;
    --radius: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    color: var(--dark);
    line-height: 1.7;
    background: var(--white);
}

.container { max-width: 800px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
    border-bottom: 1px solid #e5e7eb;
    padding: 16px 0;
    background: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    font-size: 1.3rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--dark);
}
.logo span { color: var(--primary); }
.site-header nav a {
    margin-left: 24px;
    text-decoration: none;
    color: var(--gray);
    font-size: 0.9rem;
    font-weight: 500;
}
.site-header nav a:hover { color: var(--primary); }

/* Hero */
.hero {
    padding: 80px 0 60px;
    text-align: center;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f0fe 100%);
}
.hero h1 { font-size: 2.5rem; margin-bottom: 16px; line-height: 1.2; }
.hero p { font-size: 1.15rem; color: var(--gray); max-width: 600px; margin: 0 auto; }

/* Features */
.features { padding: 60px 0; }
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--light);
    padding: 24px;
    border-radius: var(--radius);
}
.feature-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--gray); }

/* Articles */
.latest { padding: 0 0 60px; }
.latest h2 { font-size: 1.5rem; margin-bottom: 24px; }
.article-list { display: flex; flex-direction: column; gap: 16px; }
.article-card {
    display: block;
    padding: 20px 24px;
    background: var(--light);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--dark);
    transition: transform 0.15s;
}
.article-card:hover { transform: translateX(4px); }
.article-card h3 { font-size: 1.05rem; margin-bottom: 4px; }
.article-card .date { font-size: 0.8rem; color: var(--gray); }
.article-card p { font-size: 0.9rem; color: var(--gray); margin-top: 4px; }
.loading { color: var(--gray); font-size: 0.9rem; }

/* Article Page */
.article-page { padding: 40px 0 60px; }
.article-page h1 { font-size: 1.8rem; line-height: 1.3; margin-bottom: 8px; }
.article-page .meta { color: var(--gray); font-size: 0.85rem; margin-bottom: 32px; }
.article-page h2 { font-size: 1.3rem; margin: 32px 0 12px; }
.article-page h3 { font-size: 1.1rem; margin: 24px 0 8px; }
.article-page p { margin-bottom: 16px; }
.article-page ul, .article-page ol { margin: 0 0 16px 24px; }
.article-page li { margin-bottom: 8px; }
.article-page .back { display: inline-block; margin-bottom: 24px; color: var(--primary); text-decoration: none; font-size: 0.9rem; }
.article-page .back:hover { text-decoration: underline; }

/* Footer */
.site-footer {
    border-top: 1px solid #e5e7eb;
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray);
}

/* Mobile */
@media (max-width: 600px) {
    .hero h1 { font-size: 1.8rem; }
    .hero { padding: 50px 0 40px; }
    .feature-grid { grid-template-columns: 1fr; }
}