/* ===================================
   Responsive Styles - SafetyRad
   =================================== */

@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .content-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .package-types {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .transport-rules {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .container {
        max-width: 720px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .labeling-system {
        gap: 40px;
    }
    
    .label-demo {
        gap: 15px;
    }
    
    .label {
        width: 130px;
        height: 160px;
    }
    
    .transport-rules {
        grid-template-columns: 1fr;
    }
    
    .emergency-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        max-width: 540px;
    }
    
    /* Header */
    .header {
        padding: 12px 0;
    }
    
    .logo-text {
        font-size: 1.4rem;
    }
    
    .atom-animation {
        width: 40px;
        height: 40px;
    }
    
    .nucleus {
        width: 10px;
        height: 10px;
    }
    
    .orbit {
        width: 32px;
        height: 32px;
    }
    
    /* Navigation */
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(17, 17, 17, 0.98);
        padding: 20px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    }
    
    .nav-menu.active {
        display: block;
    }
    
    .nav-menu ul {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-menu a {
        display: block;
        padding: 10px 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* Hero */
    .hero {
        min-height: 100vh;
        padding: 80px 0 60px;
    }
    
    .hero-title {
        font-size: 2.4rem;
        line-height: 1.3;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 30px;
    }
    
    .btn-primary {
        padding: 12px 30px;
        font-size: 1rem;
    }
    
    /* Sections */
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 2rem;
        margin-bottom: 10px;
    }
    
    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 40px;
    }
    
    /* Cards */
    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .card {
        padding: 30px 25px;
    }
    
    .card-icon {
        width: 70px;
        height: 70px;
    }
    
    .card-icon svg {
        width: 50px;
        height: 50px;
    }
    
    .card h3 {
        font-size: 1.2rem;
    }
    
    /* Packaging */
    .packaging-container {
        margin: 30px 0;
    }
    
    .package-layer {
        width: 200px;
        padding: 18px 15px;
    }
    
    .middle-layer,
    .inner-layer {
        margin-top: -80px;
    }
    
    .layer-label {
        font-size: 1rem;
    }
    
    .package-types {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .package-card {
        padding: 20px;
    }
    
    /* Labeling */
    .label-demo {
        gap: 12px;
    }
    
    .label {
        width: 110px;
        height: 140px;
    }
    
    .label-content {
        padding: 12px;
    }
    
    .trefoil-small::before {
        font-size: 2.2rem;
    }
    
    .category {
        font-size: 0.85rem;
    }
    
    .transport-index {
        font-size: 1.2rem;
    }
    
    .detail-card {
        padding: 25px 20px;
    }
    
    .it-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .it-item {
        padding: 20px 15px;
    }
    
    .it-value {
        font-size: 1.1rem;
        padding: 8px;
    }
    
    /* Transport */
    .rule-card {
        padding: 25px 20px;
    }
    
    .rule-number {
        font-size: 2.5rem;
    }
    
    .rule-card h3 {
        font-size: 1.2rem;
    }
    
    .vehicle-types {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .vehicle-card {
        padding: 25px 20px;
    }
    
    /* Emergency */
    .emergency-steps {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .step-card {
        padding: 25px 20px;
    }
    
    .step-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
    
    .checklist {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .check-item {
        padding: 12px;
    }
    
    /* Quiz */
    .quiz-container {
        border-radius: 8px;
    }
    
    .quiz-question {
        padding: 30px 20px;
    }
    
    #questionText {
        font-size: 1.2rem;
    }
    
    .option {
        padding: 15px;
        font-size: 0.95rem;
    }
    
    .quiz-result {
        padding: 40px 20px;
    }
    
    .score-number {
        font-size: 3rem;
    }
    
    .score-total {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .container {
        max-width: 100%;
        padding: 0 15px;
    }
    
    /* Hero */
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
    }
    
    /* Labels */
    .label-demo {
        flex-direction: column;
        align-items: center;
    }
    
    .label {
        width: 160px;
        height: 120px;
    }
    
    .label:hover {
        transform: scale(1.02);
    }
    
    /* IT Index */
    .it-grid {
        grid-template-columns: 1fr;
    }
    
    /* Quiz */
    .quiz-question {
        padding: 25px 15px;
    }
    
    #questionText {
        font-size: 1.1rem;
    }
    
    .options {
        gap: 10px;
    }
    
    .option {
        padding: 12px;
        font-size: 0.9rem;
    }
    
    /* Footer */
    .footer {
        padding: 30px 0;
    }
    
    .footer p {
        font-size: 0.9rem;
    }
}

@media (max-width: 400px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .card {
        padding: 25px 20px;
    }
    
    .package-layer {
        width: 180px;
        padding: 15px;
    }
    
    .middle-layer,
    .inner-layer {
        margin-top: -70px;
    }
    
    .placard {
        width: 100px;
        height: 100px;
    }
    
    .placard-number {
        font-size: 2rem;
    }
}

/* Touch devices optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn-primary:active {
        transform: translateY(-1px);
    }
    
    .card:active {
        transform: translateY(-3px);
    }
    
    .package-layer:active {
        transform: scale(1.02);
    }
    
    .label:active {
        transform: scale(1.05);
    }
    
    .option:active {
        background: #f0f0f0;
    }
}

/* Print styles */
@media print {
    .header,
    .hero,
    .scroll-indicator,
    .quiz-container,
    .footer {
        display: none;
    }
    
    .section {
        padding: 20px 0;
        page-break-inside: avoid;
    }
    
    .card,
    .package-card,
    .rule-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .fade-in {
        opacity: 1;
        transform: none;
    }
}