/**
 * ICE Project Services Ltd - Responsive Styles
 * Mobile-first approach
 */

/* =====================================================
   TABLET (768px and below)
   ===================================================== */
@media (max-width: 768px) {
    /* Typography */
    :root {
        --font-size-6xl: 2.5rem;   /* 40px */
        --font-size-5xl: 2rem;     /* 32px */
        --font-size-4xl: 1.75rem;  /* 28px */
        --font-size-3xl: 1.5rem;   /* 24px */
    }

    /* Container */
    .container {
        padding: 0 var(--spacing-md);
    }

    /* Sections */
    .section {
        padding: var(--spacing-3xl) 0;
    }

    /* Top Bar */
    .top-bar-content {
        flex-direction: column;
        text-align: center;
    }

    .top-bar-left,
    .top-bar-right {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Navigation */
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-4xl) var(--spacing-xl);
        box-shadow: var(--shadow-2xl);
        transition: right var(--transition-base);
        overflow-y: auto;
        z-index: var(--z-modal);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--color-light-gray);
    }

    .nav-menu a {
        display: block;
        padding: var(--spacing-md) 0;
        width: 100%;
    }

    .btn-nav {
        width: 100%;
        text-align: center;
        margin-top: var(--spacing-md);
    }

    /* Mobile menu overlay */
    .mobile-menu-toggle.active + .nav-menu::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }

    /* Hero */
    .hero {
        padding: var(--spacing-3xl) 0;
        text-align: center;
    }

    .hero h1 {
        font-size: var(--font-size-4xl);
    }

    .hero p {
        font-size: var(--font-size-base);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .hero-iso-badge {
        flex-direction: column;
        text-align: center;
    }

    /* Hero Slider */
    .hero-slider {
        height: 80vh;
        min-height: 500px;
    }

    .hero-slide h1 {
        font-size: var(--font-size-4xl);
    }

    .hero-slide .hero-highlight {
        font-size: var(--font-size-2xl);
    }

    .hero-slide p {
        font-size: var(--font-size-base);
    }

    .slider-control {
        width: 50px;
        height: 50px;
    }

    .slider-control.prev {
        left: 15px;
    }

    .slider-control.next {
        right: 15px;
    }

    .slider-indicators {
        bottom: 30px;
    }

    /* Stats Grid */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: var(--font-size-3xl);
    }

    /* Services Grid */
    .services-grid {
        grid-template-columns: 1fr;
    }

    /* Projects Grid */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Project Map */
    #project-map {
        height: 400px;
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-contact li {
        justify-content: center;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }

    /* Buttons */
    .btn-lg {
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: var(--font-size-base);
    }

    /* Cards */
    .card-content {
        padding: var(--spacing-lg);
    }

    /* Filter Buttons */
    .filter-buttons {
        gap: var(--spacing-sm);
    }

    .filter-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    /* Scroll to Top */
    .scroll-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    /* Contact Page */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .contact-form-wrapper {
        padding: var(--spacing-xl);
    }

    .iso-badge-large {
        flex-direction: column;
        text-align: center;
    }

    /* Services Page */
    .lifecycle-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    .services-grid-large {
        grid-template-columns: 1fr;
    }

    .sectors-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .iso-features {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .cta-buttons .btn {
        width: 100%;
    }

    /* Gallery Page */
    .gallery-filters {
        gap: var(--spacing-sm);
    }

    .gallery-filter-btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-xs);
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .lightbox-prev,
    .lightbox-next {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1.5rem;
    }

    .lightbox-prev {
        left: 20px;
    }

    .lightbox-next {
        right: 20px;
    }

    .lightbox-close {
        right: 20px;
        font-size: 2.5rem;
    }

    .lightbox-caption {
        max-width: 90%;
        padding: var(--spacing-md);
    }

    /* Careers Page */
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .careers-disciplines {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* =====================================================
   MOBILE (480px and below)
   ===================================================== */
@media (max-width: 480px) {
    /* Typography */
    :root {
        --font-size-6xl: 2rem;      /* 32px */
        --font-size-5xl: 1.75rem;   /* 28px */
        --font-size-4xl: 1.5rem;    /* 24px */
    }

    /* Container */
    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Sections */
    .section {
        padding: var(--spacing-2xl) 0;
    }

    /* Logo */
    .logo-text {
        font-size: var(--font-size-xl);
    }

    /* Hero */
    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    /* Hero Slider */
    .hero-slider {
        height: 70vh;
        min-height: 450px;
    }

    .hero-slide h1 {
        font-size: var(--font-size-3xl);
    }

    .hero-slide .hero-highlight {
        font-size: var(--font-size-xl);
    }

    .hero-slide p {
        font-size: var(--font-size-sm);
    }

    .slider-control {
        width: 40px;
        height: 40px;
    }

    .slider-control svg {
        width: 20px;
        height: 20px;
    }

    .slider-control.prev {
        left: 10px;
    }

    .slider-control.next {
        right: 10px;
    }

    .slider-indicators {
        bottom: 20px;
    }

    .indicator {
        width: 10px;
        height: 10px;
    }

    /* Stats Grid */
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-item {
        padding: var(--spacing-lg);
    }

    .stat-number {
        font-size: var(--font-size-4xl);
    }

    /* Section Headers */
    .section-title {
        font-size: var(--font-size-3xl);
    }

    /* Service Cards */
    .service-card {
        padding: var(--spacing-xl);
    }

    .service-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-2xl);
    }

    /* Project Map */
    #project-map {
        height: 350px;
    }

    /* Contact Page */
    .contact-method {
        flex-direction: column;
        text-align: center;
    }

    .contact-form-wrapper {
        padding: var(--spacing-lg);
    }

    .map-container iframe {
        height: 300px;
    }

    .btn-large {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
    }

    /* Services Page */
    .lifecycle-grid {
        grid-template-columns: 1fr;
    }

    .lifecycle-item {
        padding: var(--spacing-lg);
    }

    .lifecycle-number {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-lg);
    }

    .sectors-grid {
        grid-template-columns: 1fr;
    }

    .cta-box {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .cta-box h2 {
        font-size: var(--font-size-3xl);
    }

    .cta-box p {
        font-size: var(--font-size-base);
    }

    /* Gallery Page */
    .gallery-filter-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-xs);
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .gallery-item {
        aspect-ratio: 16/9;
    }

    .lightbox-content {
        max-width: 95%;
        max-height: 70vh;
    }

    .lightbox-prev,
    .lightbox-next {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1.25rem;
    }

    .lightbox-prev {
        left: 10px;
    }

    .lightbox-next {
        right: 10px;
    }

    .lightbox-close {
        right: 10px;
        top: 10px;
        font-size: 2rem;
    }

    .lightbox-caption {
        bottom: 20px;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .lightbox-caption strong {
        font-size: var(--font-size-base);
    }

    /* Careers Page */
    .no-vacancies-card {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .careers-disciplines {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .discipline-item {
        padding: var(--spacing-md);
    }

    .discipline-icon {
        font-size: 2rem;
    }




    /* Footer */
    .footer-top {
        padding: var(--spacing-2xl) 0;
    }

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

    /* Buttons */
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
}

/* =====================================================
   LARGE DESKTOP (1400px and above)
   ===================================================== */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }

    .hero h1 {
        font-size: 4rem;
    }

    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* =====================================================
   PRINT STYLES
   ===================================================== */
@media print {
    .top-bar,
    .main-nav,
    .hero-buttons,
    .filter-buttons,
    .scroll-top,
    .main-footer {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    .section {
        padding: 20pt 0;
    }

    a {
        text-decoration: underline;
        color: #000;
    }

    .card,
    .project-card {
        page-break-inside: avoid;
    }
}

/* =====================================================
   ACCESSIBILITY
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #0000ff;
        --color-accent: #008000;
    }

    .btn {
        border-width: 3px;
    }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    /* Uncomment to enable dark mode */
    /*
    :root {
        --color-white: #1e293b;
        --color-off-white: #0f172a;
        --color-dark: #f8fafc;
        --color-black: #ffffff;
    }
    */
}