/* ==================== CSS Variables ==================== */
:root {
    /* Colors */
    --primary: #DC3D24;
    --primary-dark: #B32E1A;
    --primary-light: #E85C47;
    --secondary: #232B2B;
    --secondary-light: #2F3939;
    --accent: #4CAF50;
    --accent-dark: #388E3C;
    
    /* Neutrals */
    --bg-dark: #0F1419;
    --bg-card: #1A1F26;
    --bg-elevated: #232930;
    --text-primary: #FFFFFF;
    --text-secondary: #A0AEC0;
    --text-muted: #718096;
    --border: rgba(255, 255, 255, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #DC3D24 0%, #B32E1A 100%);
    --gradient-secondary: linear-gradient(135deg, #4CAF50 0%, #388E3C 100%);
    --gradient-dark: linear-gradient(135deg, #1A1F26 0%, #0F1419 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== Reset & Base ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ==================== Screen Management ==================== */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* ==================== Login Screen ==================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.login-background {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--gradient-primary);
    top: -250px;
    left: -250px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--gradient-secondary);
    bottom: -200px;
    right: -200px;
    animation-delay: 7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.login-card {
    background: rgba(26, 31, 38, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 1;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 8px 24px rgba(220, 61, 36, 0.3);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: white;
}

.login-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(220, 61, 36, 0.1);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    width: 100%;
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(220, 61, 36, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 61, 36, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

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

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

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-icon {
    transition: transform var(--transition-base);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

.error-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    color: #FCA5A5;
    font-size: 0.875rem;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.login-footer {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

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

.login-footer strong {
    color: var(--primary);
}

/* ==================== Navbar ==================== */
.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-brand .logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==================== Dashboard Layout ==================== */
.dashboard-container {
    display: flex;
    min-height: calc(100vh - 73px);
}

/* ==================== Sidebar ==================== */
.sidebar {
    width: 280px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: var(--spacing-lg);
    overflow-y: auto;
}

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

.sidebar-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.sidebar-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-xs);
}

.sidebar-btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.sidebar-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(220, 61, 36, 0.2);
}

/* ==================== Main Content ==================== */
.main-content {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
    background: var(--bg-dark);
}

.content-section {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
}

.section-header p {
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ==================== Stats Grid ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.stat-icon.workers {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.stat-icon.production {
    background: var(--gradient-primary);
}

.stat-icon.purchases {
    background: var(--gradient-secondary);
}

.stat-icon.supplies {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

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

/* ==================== Overview Grid ==================== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.overview-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.brick-types-list,
.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.brick-type-item,
.activity-item {
    padding: var(--spacing-sm);
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brick-type-name {
    font-weight: 500;
}

.brick-type-rate {
    color: var(--accent);
    font-weight: 600;
}

.activity-item {
    flex-direction: column;
    align-items: flex-start;
}

.activity-text {
    font-size: 0.9rem;
}

.activity-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ==================== Tables ==================== */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: var(--bg-elevated);
}

.data-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.data-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr {
    transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
    background: var(--bg-elevated);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.table-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-icon-only {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-icon-only:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--primary);
}

.btn-icon-only svg {
    width: 16px;
    height: 16px;
}

.btn-delete:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #EF4444;
    color: #EF4444;
}

/* ==================== Modal ==================== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease-out;
}

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

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

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

.modal-close svg {
    width: 24px;
    height: 24px;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal-form select {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.modal-form select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(220, 61, 36, 0.1);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.modal-actions .btn {
    flex: 1;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    
    .overview-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .section-header .btn {
        width: 100%;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .data-table {
        min-width: 600px;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: var(--spacing-lg);
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
    
    .navbar {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-brand {
        font-size: 1rem;
    }
    
    .user-name {
        display: none;
    }
}

/* ==================== Utility Classes ==================== */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none;
}