/* Al Dhabi Group UAE - BANDOTSLOT Industrial Engineering Theme */
:root {
    --bg-primary: #0a0f18;
    --bg-secondary: #111927;
    --bg-card: #162032;
    --bg-surface: #1e2b42;
    --gold-primary: #FFD700;
    --gold-accent: #FFC107;
    --gold-muted: #d4af37;
    --text-light: #f1f5f9;
    --text-muted: #94a3b8;
    --border-gold: rgba(212, 175, 55, 0.35);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --shadow-main: 0 12px 32px rgba(0, 0, 0, 0.55);
    --radius-md: 10px;
    --radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-light);
    line-height: 1.7;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-light);
    overflow-x: hidden;
}

a {
    color: var(--gold-primary);
    text-decoration: none;
    transition: all 0.25s ease;
}

a:hover {
    color: var(--gold-accent);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Top Utility Bar */
.top-bar {
    background: #06090f;
    border-bottom: 1px solid var(--border-gold);
    font-size: 0.85rem;
    padding: 8px 0;
    color: var(--text-muted);
}

.top-bar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.badge-iso {
    background: rgba(255, 215, 0, 0.12);
    border: 1px solid var(--gold-muted);
    color: var(--gold-primary);
    padding: 2px 10px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.78rem;
}

/* Header & Navigation */
.site-header {
    background: rgba(10, 15, 24, 0.96);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 999;
    border-bottom: 1px solid var(--border-subtle);
    padding: 14px 0;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.brand-logo img {
    height: 52px;
    width: auto;
    display: block;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 4px;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--gold-primary);
    border-bottom-color: var(--gold-primary);
}

.btn-cta-nav {
    background: linear-gradient(135deg, var(--gold-primary), var(--gold-accent));
    color: #0a0f18 !important;
    font-weight: 700 !important;
    padding: 9px 18px !important;
    border-radius: 6px;
    border: none !important;
    box-shadow: 0 4px 14px rgba(255, 215, 0, 0.25);
}

.btn-cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

/* Breadcrumb */
.breadcrumb-bar {
    background: var(--bg-secondary);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 0.88rem;
}

.breadcrumb-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    color: var(--text-muted);
}

.breadcrumb-list li::after {
    content: "›";
    margin-left: 8px;
    color: var(--gold-muted);
}

.breadcrumb-list li:last-child::after {
    content: "";
}

/* Hero Section */
.hero-section {
    padding: 55px 0 45px;
    background: radial-gradient(circle at top right, rgba(212, 175, 55, 0.14), transparent 55%),
                linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-gold);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 36px;
    align-items: center;
}

.eyebrow-tag {
    display: inline-block;
    background: rgba(255, 215, 0, 0.12);
    border-left: 4px solid var(--gold-primary);
    color: var(--gold-primary);
    padding: 5px 14px;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.hero-title {
    font-size: 2.35rem;
    line-height: 1.25;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 18px;
}

.hero-title span {
    color: var(--gold-primary);
}

.hero-lead {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 26px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gold-primary), var(--gold-accent));
    color: #0a0f18;
    font-weight: 800;
    padding: 13px 26px;
    border-radius: 8px;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 0.96rem;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--gold-primary);
    border: 1px solid var(--gold-muted);
    font-weight: 700;
    padding: 13px 24px;
    border-radius: 8px;
    display: inline-block;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    padding-top: 18px;
    border-top: 1px solid var(--border-subtle);
}

.stat-box strong {
    display: block;
    font-size: 1.45rem;
    color: var(--gold-primary);
}

.stat-box span {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.hero-media img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-gold);
    box-shadow: var(--shadow-main);
}

/* Content Layout */
.content-wrapper {
    padding: 50px 0;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 36px;
    align-items: start;
}

/* Sticky TOC Sidebar */
.sidebar-toc {
    position: sticky;
    top: 95px;
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: var(--radius-md);
    padding: 22px;
}

.sidebar-toc h3 {
    font-size: 1rem;
    color: var(--gold-primary);
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-subtle);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.88rem;
}

.toc-list a {
    color: var(--text-muted);
    display: block;
    padding: 4px 8px;
    border-radius: 4px;
}

.toc-list a:hover {
    color: #0a0f18;
    background: var(--gold-primary);
    font-weight: 600;
}

.sidebar-meta-box {
    margin-top: 22px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* Main Article Body */
.article-main {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-main);
}

.article-main h2 {
    font-size: 1.7rem;
    color: var(--gold-primary);
    margin: 36px 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-gold);
}

.article-main h2:first-of-type {
    margin-top: 0;
}

.article-main h3 {
    font-size: 1.28rem;
    color: #ffffff;
    margin: 26px 0 12px;
}

.article-main p {
    margin-bottom: 18px;
    color: #dbe4f0;
    font-size: 1.02rem;
}

.article-main ul, .article-main ol {
    margin: 0 0 22px 22px;
    color: #dbe4f0;
}

.article-main li {
    margin-bottom: 10px;
}

.article-figure {
    margin: 28px 0;
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.article-figure img {
    width: 100%;
    height: auto;
    display: block;
}

.article-figure figcaption {
    padding: 12px 18px;
    font-size: 0.86rem;
    color: var(--text-muted);
    background: #0d1420;
    border-top: 1px solid var(--border-subtle);
}

/* Highlight Callout */
.callout-box {
    background: linear-gradient(90deg, rgba(255, 215, 0, 0.1), rgba(22, 32, 50, 0.9));
    border-left: 4px solid var(--gold-primary);
    padding: 20px 24px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 24px 0;
}

.callout-box h4 {
    color: var(--gold-primary);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

/* Technical Data Table */
.table-responsive {
    overflow-x: auto;
    margin: 26px 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-gold);
}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    text-align: left;
}

.tech-table th {
    background: #0d1420;
    color: var(--gold-primary);
    padding: 14px 16px;
    font-weight: 700;
    border-bottom: 2px solid var(--gold-muted);
}

.tech-table td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--border-subtle);
    color: #e2e8f0;
}

.tech-table tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

/* Interactive Calculator Widget */
.calculator-card {
    background: var(--bg-card);
    border: 2px solid var(--gold-muted);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin: 34px 0;
}

.calculator-card h3 {
    margin-top: 0;
    color: var(--gold-primary);
}

.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 18px 0;
}

.calc-field label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 600;
}

.calc-field input, .calc-field select {
    width: 100%;
    padding: 11px 14px;
    background: #0a0f18;
    border: 1px solid var(--border-gold);
    color: #ffffff;
    border-radius: 6px;
    font-size: 0.95rem;
}

.calc-result {
    background: #0a0f18;
    border: 1px solid var(--gold-primary);
    padding: 18px;
    border-radius: 8px;
    margin-top: 16px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 12px;
}

.res-item span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.res-item strong {
    font-size: 1.25rem;
    color: var(--gold-primary);
}

/* E-E-A-T Author Box */
.author-eeat-box {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 22px;
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-top: 40px;
    align-items: center;
}

.author-eeat-box img {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    border: 2px solid var(--gold-primary);
    object-fit: cover;
}

.author-meta h4 {
    color: var(--gold-primary);
    font-size: 1.15rem;
    margin-bottom: 4px;
}

.author-role {
    font-size: 0.85rem;
    color: var(--gold-accent);
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
}

/* FAQ Accordion */
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    margin-bottom: 12px;
    padding: 18px 22px;
}

.faq-item h4 {
    color: var(--gold-primary);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

/* Footer */
.site-footer {
    background: #06090f;
    border-top: 2px solid var(--border-gold);
    padding: 55px 0 30px;
    margin-top: 60px;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 30px;
    margin-bottom: 36px;
}

.footer-col h4 {
    color: var(--gold-primary);
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: 22px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.84rem;
}

@media (max-width: 960px) {
    .hero-grid, .content-wrapper, .footer-grid {
        grid-template-columns: 1fr;
    }
    .sidebar-toc {
        position: static;
    }
    .hero-title {
        font-size: 1.85rem;
    }
    .article-main {
        padding: 24px;
    }
    .author-eeat-box {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .author-eeat-box img {
        margin: 0 auto;
    }
}