/* ============================================
   PetroSentinel - Main Stylesheet
   Petroleum Infrastructure Monitoring
   ============================================ */

/* === CSS Variables === */
:root {
    /* Brand Colors */
    --sentinel-blue: #081722;
    --fogged-grey: #E5EBEF;
    --signal-copper: #B76C32;
    --indicator-teal: #5E8B91;
    
    /* Additional Colors */
    --white: #FFFFFF;
    --text-dark: #1A2530;
    --text-medium: #4A5568;
    --text-light: #718096;
    --border-color: #CBD5E0;
    --overlay-dark: rgba(8, 23, 34, 0.85);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(8, 23, 34, 0.1);
    --shadow-md: 0 4px 8px rgba(8, 23, 34, 0.15);
    --shadow-lg: 0 8px 16px rgba(8, 23, 34, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* === Reset & Base Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--sentinel-blue);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-medium);
}

a {
    color: var(--indicator-teal);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--signal-copper);
}

/* === Header & Navigation === */
header {
    background-color: var(--sentinel-blue);
    color: var(--white);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(229, 235, 239, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background-color: var(--signal-copper);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo h1 {
    color: var(--white);
    font-size: 1.5rem;
    margin: 0;
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--fogged-grey);
    opacity: 0.8;
}

/* Navigation */
nav {
    padding: var(--spacing-sm) 0;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--fogged-grey);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    background-color: var(--indicator-teal);
    color: var(--white);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* === Hero Section === */
.hero {
    background: linear-gradient(135deg, var(--sentinel-blue) 0%, #0A2030 100%);
    color: var(--white);
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(90deg, rgba(94, 139, 145, 0.05) 1px, transparent 1px),
        linear-gradient(rgba(94, 139, 145, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    color: var(--white);
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--fogged-grey);
    margin-bottom: var(--spacing-md);
    max-width: 800px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-item {
    background-color: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--signal-copper);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--indicator-teal);
    display: block;
}

.stat-label {
    color: var(--fogged-grey);
    font-size: 0.9rem;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--signal-copper);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #9A5826;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border-color: var(--fogged-grey);
}

.btn-secondary:hover {
    background-color: var(--fogged-grey);
    color: var(--sentinel-blue);
}

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

.btn-teal:hover {
    background-color: #4A7178;
}

/* === Container & Layout === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    color: var(--sentinel-blue);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* === Grid Layouts === */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* === Cards === */
.card {
    background-color: var(--white);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-icon {
    width: 60px;
    height: 60px;
    background-color: var(--fogged-grey);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--indicator-teal);
}

.card-title {
    font-size: 1.25rem;
    color: var(--sentinel-blue);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    color: var(--text-medium);
    line-height: 1.6;
}

/* === Feature Cards === */
.feature-card {
    background-color: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--indicator-teal);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-left-color: var(--signal-copper);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 2rem;
    color: var(--indicator-teal);
    margin-bottom: var(--spacing-sm);
}

/* === Info Boxes === */
.info-box {
    background-color: var(--fogged-grey);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--signal-copper);
    margin: var(--spacing-md) 0;
}

.info-box.alert {
    background-color: #FFF5E6;
    border-left-color: var(--signal-copper);
}

.info-box.neutral {
    background-color: var(--fogged-grey);
    border-left-color: var(--indicator-teal);
}

/* === Lists === */
.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--text-medium);
}

.feature-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--indicator-teal);
    font-weight: 700;
}

/* === Forms === */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--sentinel-blue);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--indicator-teal);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* === Tables === */
.table-container {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--white);
}

thead {
    background-color: var(--sentinel-blue);
    color: var(--white);
}

th, td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
}

tbody tr:hover {
    background-color: var(--fogged-grey);
}

/* === Timeline === */
.timeline {
    position: relative;
    padding-left: var(--spacing-lg);
    margin: var(--spacing-md) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--indicator-teal);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--signal-copper);
    border: 3px solid var(--white);
    box-shadow: 0 0 0 2px var(--indicator-teal);
}

.timeline-date {
    font-weight: 600;
    color: var(--indicator-teal);
    margin-bottom: var(--spacing-xs);
}

/* === Breadcrumbs === */
.breadcrumbs {
    padding: var(--spacing-sm) 0;
    font-size: 0.9rem;
}

.breadcrumbs a {
    color: var(--text-light);
}

.breadcrumbs a:hover {
    color: var(--indicator-teal);
}

.breadcrumbs span {
    color: var(--text-light);
    margin: 0 var(--spacing-xs);
}

/* === Page Header === */
.page-header {
    background-color: var(--sentinel-blue);
    color: var(--white);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.page-header h1 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    color: var(--fogged-grey);
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto;
}

/* === Contact Section === */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-card {
    background-color: var(--fogged-grey);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
}

.contact-icon {
    font-size: 2rem;
    color: var(--indicator-teal);
    margin-bottom: var(--spacing-sm);
}

/* === Footer === */
footer {
    background-color: var(--sentinel-blue);
    color: var(--fogged-grey);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section p,
.footer-section a {
    color: var(--fogged-grey);
    font-size: 0.9rem;
}

.footer-section a:hover {
    color: var(--signal-copper);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    border-top: 1px solid rgba(229, 235, 239, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: 0.85rem;
    color: var(--fogged-grey);
}

/* === Utility Classes === */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none;
}

/* === Responsive Design === */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .nav-toggle {
        display: block;
    }
    
    nav {
        display: none;
    }
    
    nav.active {
        display: block;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-links li {
        border-bottom: 1px solid rgba(229, 235, 239, 0.1);
    }
    
    .nav-links a {
        display: block;
        padding: var(--spacing-sm);
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-md) 0;
    }
}

@media (max-width: 480px) {
    .header-top {
        flex-wrap: wrap;
    }
    
    .logo {
        flex: 1;
    }
    
    .hero {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

/* === Animations === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* === Cookie Banner === */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--sentinel-blue);
    color: var(--white);
    padding: 1.5rem;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    transform: translateY(100%);
    transition: transform 0.4s ease-in-out;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-banner-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.cookie-banner-text {
    flex: 1;
    min-width: 300px;
}

.cookie-banner-text h4 {
    color: var(--white);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.cookie-banner-text p {
    color: var(--fogged-grey);
    font-size: 0.9rem;
    margin: 0;
}

.cookie-banner-text a {
    color: var(--signal-copper);
    text-decoration: underline;
}

.cookie-banner-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.cookie-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}

.cookie-btn-accept {
    background-color: var(--signal-copper);
    color: var(--white);
}

.cookie-btn-accept:hover {
    background-color: #9A5826;
}

.cookie-btn-decline {
    background-color: transparent;
    color: var(--fogged-grey);
    border: 2px solid var(--fogged-grey);
}

.cookie-btn-decline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-color: var(--white);
}

@media (max-width: 768px) {
    .cookie-banner-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .cookie-banner-actions {
        width: 100%;
    }
    
    .cookie-btn {
        flex: 1;
    }
}

/* === Print Styles === */
@media print {
    header,
    footer,
    .nav-toggle,
    .btn,
    .cookie-banner {
        display: none;
    }
    
    body {
        color: #000;
        background: #fff;
    }
}