/* Drilling Daily — Professional Industry Publication */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Merriweather:wght@400;700&display=swap');

:root {
    --primary: #0d2137;
    --primary-mid: #163a5f;
    --primary-light: #1e5a8a;
    --accent: #c8562b;
    --accent-hover: #a8451f;
    --gold: #d4a843;
    --dark: #0a1628;
    --text: #1a2332;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg: #ffffff;
    --bg-warm: #fafaf8;
    --bg-alt: #f4f5f7;
    --bg-dark: #f0f1f3;
    --border: #e2e5ea;
    --border-light: #edf0f4;
    --radius: 6px;
    --radius-lg: 10px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --max-width: 1200px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text);
    line-height: 1.7;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== TOP BAR ===== */
.top-bar {
    background: var(--dark);
    padding: 6px 0;
    font-size: 0.8rem;
    color: #8899aa;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar a { color: #8899aa; text-decoration: none; margin-left: 16px; }
.top-bar a:hover { color: var(--gold); }

/* ===== HEADER ===== */
.site-header {
    background: var(--primary);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #fff;
}
.logo-icon { display: none; }
.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.5px;
}
.logo-text strong { color: var(--gold); }
.logo-divider {
    display: inline-block;
    width: 1px;
    height: 24px;
    background: rgba(255,255,255,0.2);
    margin: 0 12px;
}
.logo-tagline {
    font-size: 0.75rem;
    color: #8899aa;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 500;
}

.main-nav { display: flex; gap: 0; }
.main-nav a {
    color: #c0ccda;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 22px 16px;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid transparent;
}
.main-nav a:hover {
    color: #fff;
    background: rgba(255,255,255,0.05);
    border-bottom-color: var(--gold);
}
.nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; padding: 8px; }

/* ===== HERO ===== */
.hero {
    background: linear-gradient(160deg, var(--dark) 0%, var(--primary) 50%, var(--primary-mid) 100%);
    padding: 80px 0 70px;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero .container { position: relative; z-index: 1; }
.hero-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--gold);
    margin-bottom: 16px;
    padding: 6px 14px;
    border: 1px solid rgba(212,168,67,0.3);
    border-radius: 3px;
}
.hero h1 {
    font-family: var(--font-serif);
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 20px;
    color: #fff;
    max-width: 700px;
}
.hero .accent { color: var(--gold); }
.hero-sub {
    font-size: 1.15rem;
    color: #8ea3b8;
    max-width: 560px;
    margin-bottom: 36px;
    line-height: 1.8;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 13px 30px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
    letter-spacing: 0.3px;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(200,86,43,0.3);
}
.btn-outline {
    border-color: var(--primary-mid);
    color: var(--primary);
    background: transparent;
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.btn-white {
    background: #fff;
    color: var(--primary);
    border-color: #fff;
}
.btn-white:hover {
    background: var(--bg-alt);
}

/* ===== ARTICLE GRID ===== */
.featured-articles {
    padding: 70px 0;
    background: var(--bg-warm);
}
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 36px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--primary);
}
.section-header h2 {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    color: var(--primary);
    font-weight: 700;
}
.section-header a {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.section-header a:hover { color: var(--accent-hover); }

.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}
.article-card {
    background: var(--bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.25s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}
.article-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: var(--border);
}
.article-card-img {
    height: 180px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-mid) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}
.article-card-img .cat-badge {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: rgba(255,255,255,0.7);
    padding: 6px 14px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 3px;
}
.article-card-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.article-card .category-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 0.8px;
    margin-bottom: 10px;
}
.article-card h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    margin-bottom: 12px;
    line-height: 1.45;
    color: var(--primary);
    font-weight: 700;
}
.article-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.65;
    flex: 1;
}
.article-card .meta {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border-light);
    font-size: 0.8rem;
    color: var(--text-light);
    display: flex;
    justify-content: space-between;
}
.cta-row { text-align: center; margin-top: 16px; }

/* ===== NEWSLETTER ===== */
.newsletter {
    padding: 70px 0;
    background: var(--primary);
}
.newsletter-box {
    max-width: 640px;
    margin: 0 auto;
    text-align: center;
}
.newsletter-box h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: #fff;
    margin-bottom: 12px;
}
.newsletter-box p {
    color: #8ea3b8;
    margin-bottom: 28px;
    font-size: 1.05rem;
    line-height: 1.7;
}
.newsletter-form { display: flex; gap: 12px; max-width: 480px; margin: 0 auto; }
.newsletter-form input {
    flex: 1;
    padding: 14px 18px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: rgba(255,255,255,0.08);
    color: #fff;
    font-family: var(--font-sans);
}
.newsletter-form input::placeholder { color: #6b7f94; }
.newsletter-form input:focus {
    outline: none;
    border-color: var(--gold);
    background: rgba(255,255,255,0.12);
}
.newsletter-form .btn { white-space: nowrap; }

/* ===== CATEGORIES ===== */
.categories { padding: 70px 0; background: var(--bg); }
.categories .section-header { margin-bottom: 36px; }
.cat-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}
.cat-card {
    padding: 28px 20px;
    background: var(--bg-warm);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: all 0.25s ease;
    border: 1px solid var(--border-light);
    text-align: center;
}
.cat-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.cat-icon {
    font-size: 2.2rem;
    display: block;
    margin-bottom: 14px;
}
.cat-card h3 {
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: var(--primary);
    font-weight: 700;
}
.cat-card p {
    font-size: 0.8rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== FOOTER ===== */
.site-footer {
    background: var(--dark);
    color: #8899aa;
    padding: 60px 0 0;
}
.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
}
.footer-brand .logo-text {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    display: block;
    margin-bottom: 14px;
    color: #fff;
}
.footer-brand .logo-text strong { color: var(--gold); }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; }
.footer-links h4 {
    color: #fff;
    margin-bottom: 18px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}
.footer-links a {
    display: block;
    color: #6b7f94;
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color 0.2s;
}
.footer-links a:hover { color: var(--gold); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 20px 0;
    font-size: 0.8rem;
    color: #4a5a6a;
    text-align: center;
}

/* ===== BLOG ARTICLE PAGE ===== */
.article-header {
    padding: 50px 0 40px;
    background: linear-gradient(160deg, var(--bg-alt) 0%, var(--bg-warm) 100%);
    border-bottom: 1px solid var(--border);
}
.article-header .category-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 1px;
    margin-bottom: 14px;
    padding: 4px 12px;
    background: rgba(200,86,43,0.08);
    border-radius: 3px;
}
.article-header h1 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    line-height: 1.35;
    color: var(--primary);
    max-width: 800px;
    font-weight: 700;
}
.article-header .meta {
    color: var(--text-light);
    margin-top: 18px;
    font-size: 0.9rem;
}
.article-content {
    max-width: 760px;
    padding: 48px 0 80px;
}
.article-content h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin: 44px 0 18px;
    color: var(--primary);
    font-weight: 700;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-light);
}
.article-content h3 {
    font-family: var(--font-sans);
    font-size: 1.15rem;
    margin: 32px 0 14px;
    color: var(--primary-mid);
    font-weight: 700;
}
.article-content p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}
.article-content ul, .article-content ol { margin: 0 0 20px 20px; }
.article-content li {
    margin-bottom: 10px;
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-secondary);
}
.article-content blockquote {
    border-left: 3px solid var(--gold);
    padding: 20px 28px;
    margin: 28px 0;
    background: var(--bg-warm);
    font-style: italic;
    color: var(--text-secondary);
    border-radius: 0 var(--radius) var(--radius) 0;
}
.article-content table { width: 100%; border-collapse: collapse; margin: 28px 0; font-size: 0.95rem; }
.article-content th {
    padding: 12px 16px;
    background: var(--primary);
    color: #fff;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.article-content td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}
.article-content tr:hover td { background: var(--bg-warm); }
.article-content a { color: var(--primary-light); text-decoration: underline; text-underline-offset: 2px; }
.article-content a:hover { color: var(--accent); }
.article-content strong { color: var(--text); }

/* Blog listing */
.blog-header { padding: 48px 0; background: var(--bg-alt); border-bottom: 1px solid var(--border); }
.blog-header h1 { font-family: var(--font-serif); font-size: 2rem; color: var(--primary); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .cat-grid { grid-template-columns: repeat(3, 1fr); }
    .article-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero { padding: 50px 0 40px; }
    .main-nav { display: none; }
    .main-nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0; right: 0;
        background: var(--primary);
        padding: 0;
        gap: 0;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid rgba(255,255,255,0.05);
    }
    .main-nav.open a { padding: 16px 24px; border-bottom: 1px solid rgba(255,255,255,0.05); }
    .nav-toggle { display: block; }
    .article-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; gap: 30px; }
    .newsletter-form { flex-direction: column; }
    .cat-grid { grid-template-columns: 1fr 1fr; }
    .article-header h1 { font-size: 1.7rem; }
    .article-content { padding: 32px 0 60px; }
    .top-bar { display: none; }
    .section-header { flex-direction: column; gap: 8px; }
}
@media (max-width: 480px) {
    .cat-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.7rem; }
    .logo-tagline { display: none; }
    .logo-divider { display: none; }
}