/* ========================================
   MSSSL Website - Main Stylesheet
   Performance-Optimized, Mobile-First Design
   ======================================== */

/* ========== CSS VARIABLES ========== */
:root {
    /* Colors - Maritime Professional Theme */
    --primary-color: #003b5c;        /* Deep Navy Blue */
    --primary-dark: #002844;
    --primary-light: #005580;
    --secondary-color: #0088cc;      /* Ocean Blue */
    --accent-color: #ff6b35;         /* Safety Orange */
    --success-color: #28a745;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --text-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    
    /* Layout */
    --container-max: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--text-dark);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

a:hover {
    color: var(--primary-color);
}

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

/* ========== LAYOUT ========== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

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

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto;
}

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

/* ========== BUTTONS ========== */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--text-white);
    border-color: var(--accent-color);
}

.btn-primary:hover {
    background-color: #ff5520;
    color: var(--text-white);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-white);
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

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

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

.btn-white {
    background-color: var(--text-white);
    color: var(--primary-color);
    border-color: var(--text-white);
}

.btn-white:hover {
    background-color: transparent;
    color: var(--text-white);
    border-color: var(--text-white);
}

.btn-outline-white {
    background-color: transparent;
    color: var(--text-white);
    border-color: var(--text-white);
}

.btn-outline-white:hover {
    background-color: var(--text-white);
    color: var(--primary-color);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.125rem;
}

.btn-small {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* ========== HEADER ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--primary-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-list a {
    color: var(--text-white);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
}

.nav-list a:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-white);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-radius: var(--border-radius);
    min-width: 250px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 100;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    border-bottom: 1px solid var(--border-color);
}

.dropdown-menu li:last-child {
    border-bottom: none;
}

.dropdown-menu a {
    color: var(--text-dark);
    padding: var(--spacing-sm);
    display: block;
}

.dropdown-menu a:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-white);
    border-radius: 3px;
    transition: var(--transition);
}

.phone-icon {
    margin-right: 4px;
}

/* ========== HERO SECTION ========== */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    background-image: url('https://msssl.co/wp-content/uploads/2019/07/left-image1.jpg');
    background-size: cover;
    background-position: center;
    background-blend-mode: multiply;
    padding: var(--spacing-xl) 0;
    margin-top: 80px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0,59,92,0.95) 0%, rgba(0,40,68,0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    color: var(--text-white);
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    color: rgba(255,255,255,0.9);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero-trust-signals {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-white);
    font-weight: 500;
}

.trust-icon {
    font-size: 1.25rem;
    color: var(--success-color);
}

/* ========== VALUE PROPOSITION ========== */
.value-prop {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.value-item {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    text-align: center;
    transition: var(--transition);
}

.value-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.value-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.value-item h3 {
    margin-bottom: var(--spacing-sm);
}

.value-item p {
    font-size: 0.95rem;
}

/* ========== SERVICES ========== */
.services {
    padding: var(--spacing-xl) 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.service-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.service-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 16px rgba(0,59,92,0.15);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.service-card h3 {
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    margin-bottom: var(--spacing-md);
}

.service-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.service-features li {
    padding: 6px 0;
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ========== PORT COVERAGE ========== */
.port-coverage {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.ports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.port-card {
    background-color: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.port-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.port-card.featured {
    border-color: var(--accent-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--text-white);
}

.port-card.featured h3,
.port-card.featured p {
    color: var(--text-white);
}

.port-location {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.port-card.featured .port-location {
    color: rgba(255,255,255,0.9);
}

/* ========== WHY CHOOSE ========== */
.why-choose {
    padding: var(--spacing-xl) 0;
}

.why-choose-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.why-item {
    margin-bottom: var(--spacing-md);
}

.why-item h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.why-choose-image img {
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* ========== CTA SECTION ========== */
.cta-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    text-align: center;
}

.cta-content h2 {
    color: var(--text-white);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    color: rgba(255,255,255,0.9);
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== FOOTER ========== */
.footer {
    background-color: var(--primary-dark);
    color: rgba(255,255,255,0.9);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer h4 {
    color: var(--text-white);
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.footer-contact {
    margin-top: var(--spacing-sm);
}

.footer-contact p {
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--spacing-xs);
}

.footer-contact a {
    color: var(--secondary-color);
}

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

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

.footer-links a {
    color: rgba(255,255,255,0.8);
}

.footer-links a:hover {
    color: var(--text-white);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    text-align: center;
}

.footer-certifications {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.cert-badge {
    background-color: rgba(255,255,255,0.1);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.copyright {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}

/* ========== STICKY CONTACT BAR ========== */
.sticky-contact {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--accent-color);
    padding: var(--spacing-sm);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.2);
    z-index: 999;
    display: none;
}

.sticky-btn {
    display: block;
    color: var(--text-white);
    font-weight: 600;
    text-align: center;
    font-size: 1.125rem;
}

/* ========== RESPONSIVE DESIGN ========== */

/* Tablet */
@media (max-width: 968px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .hero {
        min-height: 500px;
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .why-choose-content {
        grid-template-columns: 1fr;
    }
    
    .why-choose-image {
        order: -1;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 32px;
        --spacing-xl: 48px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Header Mobile */
    .nav {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--primary-color);
        transition: var(--transition);
        overflow-y: auto;
    }
    
    .nav.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
    }
    
    .nav-list li {
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background-color: rgba(0,0,0,0.2);
        margin-top: var(--spacing-xs);
        display: none;
    }
    
    .dropdown.active .dropdown-menu {
        display: block;
    }
    
    .dropdown-menu a {
        color: rgba(255,255,255,0.9);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .header-cta {
        display: none;
    }
    
    /* Hero Mobile */
    .hero {
        margin-top: 70px;
        min-height: 450px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-trust-signals {
        gap: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    /* Grids Mobile */
    .value-grid,
    .services-grid,
    .ports-grid {
        grid-template-columns: 1fr;
    }
    
    /* CTA Section Mobile */
    .cta-content h2 {
        font-size: 1.75rem;
    }
    
    .cta-content p {
        font-size: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    /* Sticky Contact - Show on Mobile */
    .sticky-contact {
        display: block;
    }
    
    /* Footer Mobile */
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.5rem; }
    
    .btn-large {
        padding: 14px 24px;
        font-size: 1rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .value-item,
    .service-card,
    .port-card {
        padding: var(--spacing-md);
    }
}

/* ========== PERFORMANCE OPTIMIZATIONS ========== */

/* Reduce animations on low-power devices */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .sticky-contact,
    .hero,
    .cta-section,
    .footer {
        display: none;
    }
}