/* ==================== DESIGN SYSTEM (Industrial Precision) ==================== */
:root {
    /* Colors - From DESIGN.md */
    --surface: #f8f9ff;
    --surface-dim: #cbdbf5;
    --surface-bright: #f8f9ff;
    --surface-container-lowest: #ffffff;
    --surface-container-low: #eff4ff;
    --surface-container: #e5eeff;
    --surface-container-high: #dce9ff;
    --surface-container-highest: #d3e4fe;
    --on-surface: #0b1c30;
    --on-surface-variant: #424750;
    --inverse-surface: #213145;
    --inverse-on-surface: #eaf1ff;
    --outline: #727781;
    --outline-variant: #c2c7d2;
    --surface-tint: #2060a0;
    
    --primary: #004982;
    --on-primary: #ffffff;
    --primary-container: #2161a1;
    --on-primary-container: #c4dbff;
    --inverse-primary: #a2c9ff;
    
    --secondary: #575e70;
    --on-secondary: #ffffff;
    --secondary-container: #d9dff5;
    --on-secondary-container: #5c6274;
    
    --tertiary: #793200;
    --on-tertiary: #ffffff;
    --tertiary-container: #9f4400;
    --on-tertiary-container: #ffd0ba;
    
    --error: #ba1a1a;
    --on-error: #ffffff;
    
    /* Functional Colors */
    --cta: #F97316;
    --cta-hover: #EA580C;
    --shadow: rgba(17, 24, 39, 0.05);
    --border: #E2E8F0;

    /* Spacing */
    --space-base: 8px;
    --space-xs: 4px;
    --space-sm: 12px;
    --space-md: 24px;
    --space-lg: 48px;
    --space-xl: 80px;
    --container-max: 1280px;
    --gutter: 24px;

    /* Radius */
    --radius-sm: 0.125rem;
    --radius-default: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-standard: 0.3s ease;
}

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--surface);
    color: var(--on-surface);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-standard);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ==================== TYPOGRAPHY ==================== */
h1, .display {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--on-surface);
}

h2, .headline-lg {
    font-size: 32px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

h3, .headline-md {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
}

.body-lg {
    font-size: 18px;
    line-height: 1.6;
}

.body-md {
    font-size: 16px;
    line-height: 1.5;
}

.label-caps {
    font-size: 12px;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--primary);
}

.text-muted {
    color: var(--on-surface-variant);
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-default);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition-standard);
    border: 1px solid transparent;
    gap: 8px;
}

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

.btn-primary:hover {
    background-color: var(--primary-container);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 73, 130, 0.2);
}

.btn-cta {
    background-color: var(--cta);
    color: white;
}

.btn-cta:hover {
    background-color: var(--cta-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.2);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--primary);
    color: var(--primary);
}

.btn-secondary:hover {
    background-color: var(--surface-container-low);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--outline-variant);
    color: var(--on-surface-variant);
}

.btn-outline:hover {
    background-color: var(--surface-container-lowest);
    border-color: var(--primary);
    color: var(--primary);
}

/* ==================== NAVBAR ==================== */
.navbar {
    background-color: var(--surface-container-lowest);
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo-img {
    height: 48px;
    width: auto;
    border-radius: var(--radius-sm);
}

.logo-text {
    font-weight: 700;
    font-size: 18px;
    line-height: 1.1;
    color: var(--primary);
    letter-spacing: 0.02em;
}

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

.nav-links {
    font-weight: 500;
    font-size: 15px;
    color: var(--on-surface-variant);
}

.nav-links:hover, .nav-links.active {
    color: var(--primary);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.bar {
    width: 24px;
    height: 2px;
    background-color: var(--on-surface);
    transition: var(--transition-standard);
}

/* ==================== DROPDOWNS ==================== */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-arrow {
    font-size: 10px;
    transition: transform 0.3s;
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-standard {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--surface-container-lowest);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px var(--shadow);
    min-width: 200px;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition-standard);
    z-index: 1001;
}

.dropdown-mega {
    position: absolute;
    top: 100%;
    right: -200px;
    background: var(--surface-container-lowest);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px var(--shadow);
    width: 800px;
    padding: 32px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition-standard);
    z-index: 1001;
}

.nav-dropdown:hover .dropdown-standard,
.nav-dropdown:hover .dropdown-mega {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-category h4 {
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

.dropdown-item {
    display: flex;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-default);
    margin-bottom: 4px;
}

.dropdown-item:hover {
    background-color: var(--surface-container-low);
}

.dropdown-item img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    background: var(--surface-container);
    border-radius: var(--radius-sm);
    padding: 4px;
}

.dropdown-item strong {
    display: block;
    font-size: 14px;
    color: var(--on-surface);
}

.dropdown-item span {
    font-size: 12px;
    color: var(--on-surface-variant);
}

.dropdown-footer {
    grid-column: 1 / -1;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    text-align: center;
}

/* ==================== HERO SECTION ==================== */
.hero {
    padding-top: 160px;
    padding-bottom: 80px;
    background-color: var(--surface-container-low);
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 40%;
    height: 100%;
    background: linear-gradient(135deg, transparent, var(--surface-container-highest));
    z-index: 0;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-title {
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--on-surface-variant);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-btns {
    display: flex;
    gap: 16px;
}

/* ==================== CARDS ==================== */
.industrial-card {
    background-color: var(--surface-container-lowest);
    border: 1px solid var(--border);
    border-radius: var(--radius-default);
    padding: 24px;
    transition: var(--transition-standard);
    box-shadow: 0 4px 20px var(--shadow);
}

.industrial-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(17, 24, 39, 0.1);
    border-color: var(--primary);
}

.service-card {
    display: flex;
    flex-direction: column;
}

.service-card-header {
    background-color: var(--surface-container-low);
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    margin: -24px -24px 24px -24px;
    border-top-left-radius: var(--radius-default);
    border-top-right-radius: var(--radius-default);
}

/* ==================== SECTIONS ==================== */
section {
    padding: 80px 0;
}

.section-overline {
    display: block;
    margin-bottom: 12px;
}

.section-title {
    margin-bottom: 16px;
}

.section-desc {
    color: var(--on-surface-variant);
    font-size: 18px;
    max-width: 700px;
    margin-bottom: 48px;
}

.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

/* ==================== FEATURES ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: -120px;
    position: relative;
    z-index: 10;
}

.feature-icon {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 16px;
}

/* ==================== DATA TABLES ==================== */
.data-table-container {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background-color: #111827;
    color: white;
    text-align: left;
    padding: 16px;
    font-weight: 600;
}

.data-table td {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.data-table tr:nth-child(even) {
    background-color: var(--surface-container-low);
}

.data-table tr:last-child td {
    border-bottom: none;
}

/* ==================== CLIENT MARQUEE ==================== */
.marquee-container {
    overflow: hidden;
    padding: 40px 0;
    position: relative;
    background-color: var(--surface-container-lowest);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.marquee-track {
    display: flex;
    gap: 48px;
    width: max-content;
    padding-right: 48px; /* Matches gap for perfect -50% loop */
    animation: marquee 40s linear infinite;
}

@keyframes marquee {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

.client-logo {
    height: 60px;
    width: auto;
    filter: grayscale(1);
    opacity: 0.6;
    transition: var(--transition-standard);
}

.client-logo:hover {
    filter: grayscale(0);
    opacity: 1;
}

/* ==================== FOOTER ==================== */
.footer {
    background-color: var(--inverse-surface);
    color: var(--inverse-on-surface);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 48px;
    margin-bottom: 64px;
}

.footer-title {
    color: white;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--inverse-on-surface);
    opacity: 0.8;
}

.footer-links a:hover {
    color: var(--primary-fixed-dim);
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 40px;
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    opacity: 0.6;
}

/* ==================== ANIMATIONS ==================== */
.fade-in-up {
    animation: fadeInUp 0.8s ease forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== MOBILE RESPONSIVE ==================== */
@media (max-width: 992px) {
    .dropdown-mega {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        margin-top: 0;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1, .display { font-size: 36px; }
    h2, .headline-lg { font-size: 28px; }
    
    .nav-menu {
        display: none; /* In a real scenario, this would be a mobile menu */
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== LEGAL & DOCS ==================== */
.legal-content h2 {
    margin-top: 32px;
    color: var(--on-surface);
    border-bottom: 2px solid var(--surface-container);
    padding-bottom: 8px;
}

.legal-content p {
    margin-bottom: 20px;
    color: var(--on-surface-variant);
    line-height: 1.7;
}

.legal-content strong {
    color: var(--primary);
}