/* Minimalist 3D Print Calculator */
:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-primary: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-muted: #9ca3af;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 8px;
    --radius-sm: 4px;
    --transition: all 0.2s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--primary);
}

.brand i {
    font-size: 1.25rem;
}

.nav {
    display: flex;
    gap: 0.25rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
    font-size: 0.875rem;
}

.nav-btn:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

.nav-btn.active {
    background: var(--primary);
    color: white;
}

/* Language Selector */
.language-selector {
    display: flex;
    align-items: center;
    margin-left: auto;
    margin-right: 1rem;
}

.language-select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    min-width: 100px;
}

.language-select:hover {
    border-color: var(--primary);
}

.language-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.logout-btn {
    padding: 0.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.logout-btn:hover {
    background: var(--bg-secondary);
    color: var(--danger);
}

/* Main */
.main {
    padding: 2rem 0;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

.actions {
    display: flex;
    gap: 0.5rem;
}

/* Calculator Grid */
.calc-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
    align-items: start;
}

.input-panel, .result-panel {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.result-panel {
    position: sticky;
    top: 6rem;
}

/* Input Groups */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group:last-child {
    margin-bottom: 0;
}

.autocomplete-container {
    position: relative;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.input-group label i {
    color: var(--primary);
    width: 16px;
    text-align: center;
}

.input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

/* Time Input */
.time-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-secondary);
    padding: 0.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.time-input input {
    border: none;
    background: transparent;
    padding: 0;
    width: 3rem;
    text-align: center;
    font-weight: 600;
    font-size: 1.125rem;
}

.time-input span {
    font-weight: 600;
    color: var(--text-secondary);
}

.time-input small {
    color: var(--text-light);
    font-size: 0.75rem;
    margin-left: auto;
}

/* Material Row */
.material-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.material-row .input-group {
    margin-bottom: 0;
}

.material-row select, .material-row input {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) - 2px);
    background: var(--bg);
    font-size: 0.875rem;
}

.material-cost {
    font-weight: 600;
    color: var(--primary);
    text-align: center;
    padding: 0.5rem;
    background: var(--bg);
    border-radius: calc(var(--radius) - 2px);
    border: 1px solid var(--border);
}

.remove-btn {
    padding: 0.5rem;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: calc(var(--radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
}

.remove-btn:hover {
    background: #dc2626;
}

/* Cost Breakdown */
.cost-breakdown {
    margin-bottom: 1.5rem;
}

.cost-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.cost-item:last-child {
    border-bottom: none;
}

.cost-total {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0 0;
    border-top: 2px solid var(--border);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--primary);
    margin-top: 1rem;
}

/* Buttons */
.primary-btn, .secondary-btn, .add-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 0.875rem;
}

.primary-btn {
    background: var(--primary);
    color: white;
    width: 100%;
    justify-content: center;
}

.primary-btn:hover {
    background: var(--primary-light);
}

.secondary-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.secondary-btn:hover {
    background: var(--border);
}

.add-btn {
    background: var(--success);
    color: white;
    width: 100%;
    justify-content: center;
}

.add-btn:hover {
    background: #059669;
}

/* Filaments Grid */
.filaments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.filament-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.filament-card:hover {
    box-shadow: var(--shadow-lg);
}

.filament-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.filament-name {
    font-weight: 600;
    color: var(--text);
}

.filament-color {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.filament-actions {
    display: flex;
    gap: 0.5rem;
}

.filament-actions button {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.filament-code {
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 500;
    font-family: 'Courier New', monospace;
    background: var(--bg-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: calc(var(--radius) - 4px);
    margin-top: 0.25rem;
    display: inline-block;
}

.filament-code-empty {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-style: italic;
    margin-top: 0.25rem;
}

.product-code {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--primary);
    background: var(--bg-light);
    padding: 0.25rem 0.5rem;
    border-radius: calc(var(--radius) - 4px);
    border: 1px solid var(--primary);
}

/* Form Panel */
.form-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 2rem;
}

.form-panel h3 {
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

/* Enhanced Form Styles */
.form-header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-header h3 {
    margin: 0 0 0.5rem 0;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.form-header p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Autocomplete Suggestions */
.autocomplete-suggestions {
    position: absolute;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
    max-height: 200px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    width: 100%;
    left: 0;
    top: 100%;
}

.autocomplete-suggestion:last-child {
    border-bottom: none;
}

.autocomplete-category {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    padding: 0.5rem 0.75rem;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
}

/* Statistics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.stats-panel {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.stats-panel h3 {
    margin: 0 0 1rem 0;
    color: var(--primary);
    font-size: 1.125rem;
    font-weight: 600;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-value {
    font-weight: 600;
    color: var(--primary);
}

/* History Styles */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.history-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    cursor: pointer;
}

.history-item:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.history-name {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text);
}

.history-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.history-details {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}

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

.history-detail-value {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.history-detail-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Statistics Styles */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.stats-panel {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.stats-panel h3 {
    margin: 0 0 1rem 0;
    color: var(--primary);
    font-size: 1.125rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-value {
    font-weight: 600;
    color: var(--text);
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.empty-state p {
    margin: 0;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.modal-content {
    background: var(--bg);
    border-radius: var(--radius);
    max-width: 90vw;
    max-height: 90vh;
    width: 800px;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    margin: 0;
    color: var(--primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

.modal-body {
    padding: 1.5rem;
}

.detail-section {
    margin-bottom: 2rem;
}

.detail-section:last-child {
    margin-bottom: 0;
}

.detail-section h4 {
    margin: 0 0 1rem 0;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.detail-section h4 i {
    color: var(--primary);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.detail-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}

.detail-card-header {
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.detail-card-value {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text);
}

.material-detail {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 1rem;
}

.material-detail:last-child {
    margin-bottom: 0;
}

.material-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.material-name {
    font-weight: 600;
    color: var(--text);
}

.material-cost {
    font-weight: 600;
    color: var(--primary);
}

.material-weight {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Login Styles */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.login-form {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 2rem;
    width: 400px;
    max-width: 90vw;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-form h2 {
    margin: 0 0 0.5rem 0;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.login-form p {
    margin: 0 0 1.5rem 0;
    color: var(--text-secondary);
}

.login-info {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    color: var(--text-secondary);
}

.login-info i {
    color: var(--primary);
    margin-right: 0.25rem;
}

/* User Info in Header */
.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.user-info i {
    color: var(--primary);
}

.logout-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius);
    transition: var(--transition);
}

.logout-btn:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

/* Audit Log Styles */
.audit-log-container {
    max-height: 70vh;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
}

.audit-entry {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.audit-entry:last-child {
    border-bottom: none;
}

.audit-entry:hover {
    background: var(--bg-secondary);
}

.audit-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.audit-action {
    font-weight: 600;
    color: var(--text);
}

.audit-time {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.audit-details {
    margin: 0.75rem 0;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text);
}

.audit-details strong {
    color: var(--primary);
    display: block;
    margin-top: 0.5rem;
}

.audit-details strong:first-child {
    margin-top: 0;
}

.audit-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.audit-info {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    color: var(--text-secondary);
    border-left: 3px solid var(--primary);
}

.audit-info i {
    color: var(--primary);
    margin-right: 0.5rem;
}

.section-actions {
    display: flex;
    gap: 0.5rem;
}

.danger-btn {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

.danger-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.danger-btn i {
    margin-right: 0.25rem;
}

/* Empty State for Audit Log */
.audit-log-container .empty-state {
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
}

.audit-log-container .empty-state i {
    font-size: 3rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

/* Welcome Modal Styles */
.welcome-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.welcome-modal.show {
    opacity: 1;
    visibility: visible;
}

.welcome-content {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    color: white;
    position: relative;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.welcome-modal.show .welcome-content {
    transform: translateY(0);
}

.welcome-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.welcome-content h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.welcome-user {
    background: rgba(255, 255, 255, 0.2);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.welcome-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.welcome-username {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.welcome-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.welcome-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Mobile responsiveness for welcome modal */
@media (max-width: 768px) {
    .welcome-content {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }
    
    .welcome-icon {
        font-size: 2.5rem;
    }
    
    .welcome-content h3 {
        font-size: 1.5rem;
    }
    
    .welcome-username {
        font-size: 1.1rem;
    }
}

/* Responsive Design */

/* Tablet breakpoint */
@media (max-width: 1024px) {
    .form-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    /* Mobile language selector */
    .language-selector {
        margin: 0;
        order: -1;
    }
    
    .language-select {
        min-width: 120px;
        font-size: 0.875rem;
    }
    
    /* Hide nav button text on mobile, show only icons */
    .nav-btn span {
        display: none;
    }
    
    .nav-btn {
        padding: 0.5rem;
        min-width: 44px;
        justify-content: center;
    }
    
    .calc-grid {
        grid-template-columns: 1fr;
    }
    
    .result-panel {
        position: static;
        order: -1;
    }
    
    .material-row {
        grid-template-columns: 1fr;
    }
    
    .history-details {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

/* Very small mobile devices */
@media (max-width: 480px) {
    .header-content {
        padding: 0.75rem 0;
    }
    
    .brand {
        font-size: 1rem;
    }
    
    .language-select {
        min-width: 100px;
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }
    
    .nav {
        gap: 0.125rem;
    }
    
    .nav-btn {
        padding: 0.4rem;
        min-width: 40px;
    }
}