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

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    :root {
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
    }

    .container {
        padding: 0 var(--spacing-lg);
    }

    .header-top {
        gap: var(--spacing-lg);
    }

    .nav-breadcrumb a {
        padding: 6px 10px;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero-split {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-right {
        order: -1;
    }

    .hero-illustration {
        max-width: 220px;
    }

    .hero-slogan {
        text-align: left;
    }

    .hero-cta-btn {
        margin-left: auto;
        margin-right: auto;
    }

    .stats-row {
        justify-content: center;
    }

    .process-flow {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .process-flow-arrow {
        transform: rotate(90deg);
        padding: var(--spacing-xs) 0;
    }

    .process-panel {
        padding: var(--spacing-xl) var(--spacing-md);
    }

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

    .form-header h1 {
        font-size: 1.75rem;
    }

    .progress-steps {
        gap: var(--spacing-sm);
    }

    .step-label {
        font-size: 0.75rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 1rem;
        --spacing-2xl: 1.5rem;
    }

    body {
        font-size: 14px;
    }

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

    /* Header */
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
        margin-bottom: var(--spacing-md);
        position: static;
    }

    .header-top {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .header-brand {
        flex-wrap: wrap;
    }

    .brand-logo-full img {
        height: 28px;
    }

    .nav-breadcrumb {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-xs);
    }

    #gioi-thieu,
    #quy-trinh,
    #lien-he {
        scroll-margin-top: 16px;
    }

    /* Dashboard */
    .hero {
        margin-bottom: var(--spacing-xl);
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .hero-desc,
    .hero-cta {
        font-size: 0.95rem;
    }

    .stats-row {
        flex-direction: column;
    }

    .stat-item {
        min-width: 0;
    }

    .category-zone {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .categories-grid,
    .links-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .category-card {
        padding: var(--spacing-lg);
    }

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

    /* Forms */
    .form-container {
        margin: var(--spacing-lg) 0;
        padding: var(--spacing-md);
    }

    .form-header h1 {
        font-size: 1.5rem;
    }

    .form-header p {
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.25rem;
    }

    .progress-bar {
        height: 6px;
    }

    .progress-steps {
        gap: var(--spacing-xs);
    }

    .step-number {
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }

    .step-label {
        font-size: 0.65rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .form-field {
        gap: var(--spacing-xs);
    }

    label {
        font-size: 0.9rem;
    }

    input,
    textarea,
    select {
        padding: var(--spacing-md) var(--spacing-md);
        font-size: 16px; /* Prevent zoom on focus */
    }

    /* Buttons */
    .btn {
        padding: var(--spacing-md);
        font-size: 0.95rem;
    }

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

    .btn-group {
        flex-direction: column;
    }

    .form-buttons {
        flex-direction: column;
        gap: var(--spacing-md);
        margin-top: var(--spacing-lg);
    }

    .btn-prev,
    .btn-next,
    .btn-submit {
        width: 100%;
    }

    /* Members */
    .member-item {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .member-remove {
        width: 100%;
    }

    /* File Upload */
    .upload-area {
        padding: var(--spacing-xl);
    }

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

    .file-list {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: var(--spacing-sm);
    }

    .file-item img,
    .file-item video,
    .file-item-icon {
        height: 80px;
    }

    /* Success Section */
    .success-section {
        padding: var(--spacing-lg);
    }

    .submission-id {
        font-size: 1rem;
        padding: var(--spacing-md);
    }

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

    .footer p {
        font-size: 0.85rem;
    }

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

    .footer-links-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

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

    .footer-links-2col {
        grid-template-columns: 1fr 1fr;
    }
}

/* Small Mobile (< 480px) */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 0.75rem;
        --spacing-md: 0.5rem;
    }

    html {
        font-size: 14px;
    }

    .header-top {
        gap: var(--spacing-md);
    }

    .brand-logo-full img {
        height: 24px;
    }

    .hero h2 {
        font-size: 1.25rem;
    }

    .category-card {
        padding: var(--spacing-md);
    }

    .card-icon {
        font-size: 1.5rem;
    }

    .category-card h3 {
        font-size: 1.1rem;
    }

    .category-card p {
        font-size: 0.85rem;
    }

    .form-container {
        padding: var(--spacing-md);
    }

    .form-header h1 {
        font-size: 1.25rem;
    }

    .step-number {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
    }

    .section-title {
        font-size: 1.1rem;
    }

    .btn {
        padding: var(--spacing-md);
        font-size: 0.9rem;
    }

    .member-item {
        padding: var(--spacing-sm);
    }

    .upload-area {
        padding: var(--spacing-lg);
    }

    input,
    textarea,
    select {
        padding: var(--spacing-md);
    }
}

/* Landscape Mode */
@media (max-height: 600px) and (orientation: landscape) {
    .header {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }

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

    .form-container {
        margin: var(--spacing-lg) auto;
    }

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

    .form-buttons {
        margin-top: var(--spacing-lg);
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }

    .header,
    .footer,
    .form-buttons,
    .btn {
        display: none;
    }

    .form-container {
        max-width: 100%;
        margin: 0;
        padding: 0;
    }

    input,
    textarea,
    select {
        border: 1px solid #333;
    }
}

/* High DPI Screens */
@media (min-resolution: 2dppx) {
    input,
    textarea,
    select {
        font-size: 16px;
    }

    .btn {
        font-size: 16px;
    }
}