/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Dark Mode Minimal Palette */
    --bg-primary: #0a0e14;
    --bg-secondary: #151a23;
    --bg-tertiary: #1a2332;
    --bg-elevated: #202938;
    
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    
    --accent-primary: #58a6ff;
    --accent-secondary: #1f6feb;
    --accent-tertiary: #388bfd;
    
    --border-primary: #30363d;
    --border-secondary: #21262d;
    
    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;
    
    /* Shadows for depth */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* ===================================
   TYPOGRAPHY
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-top: var(--space-12);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

h2 i {
    color: var(--accent-primary);
    flex-shrink: 0;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    margin-top: var(--space-8);
}

h4 {
    font-size: 1.125rem;
    margin-top: var(--space-6);
}

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

.lead {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-tertiary);
}

/* ===================================
   HEADER
   =================================== */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    padding: var(--space-12) 0;
}

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

.header h1 {
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.header h1 i {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

@media (max-width: 768px) {
    .header {
        padding: var(--space-8) 0;
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}

/* ===================================
   NAVIGATION
   =================================== */
.nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) 0;
}

.nav-list li a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav-list li a:hover {
    background: var(--bg-elevated);
    color: var(--accent-primary);
}

.nav-list li a.active {
    background: var(--accent-secondary);
    color: white;
}

.nav-list li a i {
    width: 16px;
    height: 16px;
}

@media (max-width: 768px) {
    .nav-list {
        flex-direction: column;
        padding: var(--space-3) 0;
    }
    
    .nav-list li a {
        justify-content: center;
        width: 100%;
    }
}

/* ===================================
   MAIN CONTENT
   =================================== */
.main {
    padding: var(--space-12) 0;
    min-height: 60vh;
}

.section {
    margin-bottom: var(--space-16);
}

@media (max-width: 768px) {
    .main {
        padding: var(--space-8) 0;
    }
    
    .section {
        margin-bottom: var(--space-12);
    }
}

/* ===================================
   CARDS
   =================================== */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    transition: all 0.3s ease;
}

.card:hover {
    border-color: var(--border-secondary);
    box-shadow: var(--shadow-md);
}

.highlight-card {
    border-left: 3px solid var(--accent-primary);
    background: linear-gradient(to right, rgba(88, 166, 255, 0.05), var(--bg-secondary));
}

.warning-card {
    border-left: 3px solid var(--warning);
    background: linear-gradient(to right, rgba(210, 153, 34, 0.05), var(--bg-secondary));
}

@media (max-width: 768px) {
    .card {
        padding: var(--space-4);
    }
}

/* ===================================
   STATS GRID
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.stat-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    padding: var(--space-6);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.stat-card i {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
    margin-bottom: var(--space-3);
}

.stat-card h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-2);
    font-weight: 600;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--space-2);
}

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

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   INFO BOXES
   =================================== */
.chemistry-box,
.info-box,
.compliance-box {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    margin: var(--space-6) 0;
}

.chemistry-box {
    border-left: 3px solid var(--accent-primary);
}

.info-box {
    border-left: 3px solid var(--success);
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
}

.info-box i {
    color: var(--success);
    flex-shrink: 0;
    margin-top: 2px;
}

.compliance-box {
    border-left: 3px solid var(--success);
}

.chemistry-box h4,
.compliance-box h4 {
    color: var(--accent-primary);
    margin-top: var(--space-4);
}

.chemistry-box ol,
.compliance-box ul {
    margin-left: var(--space-6);
}

.chemistry-box li,
.compliance-box li {
    margin-bottom: var(--space-3);
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .info-box {
        flex-direction: column;
    }
}

/* ===================================
   TABLES
   =================================== */
.table-wrapper {
    overflow-x: auto;
    margin: var(--space-6) 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-primary);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-secondary);
    font-size: 0.875rem;
}

thead {
    background: var(--bg-tertiary);
    border-bottom: 2px solid var(--border-primary);
}

th {
    padding: var(--space-4);
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    white-space: nowrap;
}

td {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-secondary);
    color: var(--text-secondary);
}

tbody tr:hover {
    background: var(--bg-tertiary);
}

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

.total-row {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.total-row td {
    border-top: 2px solid var(--accent-primary);
    color: var(--text-primary);
}

@media (max-width: 768px) {
    th, td {
        padding: var(--space-3);
        font-size: 0.8125rem;
    }
}

/* ===================================
   PROCEDURE STEPS
   =================================== */
.procedure-step {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding: var(--space-5);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.procedure-step:hover {
    border-color: var(--accent-primary);
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--accent-secondary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.step-content {
    flex: 1;
}

.step-content h4 {
    margin-top: 0;
    color: var(--text-primary);
}

.step-content ul {
    margin-left: var(--space-6);
}

.step-content li {
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .procedure-step {
        flex-direction: column;
        padding: var(--space-4);
    }
}

/* ===================================
   EQUIPMENT & FACILITY GRIDS
   =================================== */
.equipment-grid,
.facility-grid,
.success-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.equipment-card,
.facility-item,
.success-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    transition: all 0.3s ease;
}

.equipment-card:hover,
.facility-item:hover,
.success-item:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.equipment-card i,
.facility-item h4 i,
.success-item i {
    color: var(--accent-primary);
    width: 28px;
    height: 28px;
    margin-bottom: var(--space-3);
}

.equipment-card h4,
.facility-item h4,
.success-item h4 {
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: var(--space-4);
}

.equipment-card ul,
.facility-item ul {
    list-style: none;
}

.equipment-card li,
.facility-item li {
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--border-secondary);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.equipment-card li:last-child,
.facility-item li:last-child {
    border-bottom: none;
}

.success-item {
    text-align: center;
}

.success-item p {
    font-size: 0.875rem;
    margin: 0;
}

@media (max-width: 768px) {
    .equipment-grid,
    .facility-grid,
    .success-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   WORKFLOW
   =================================== */
.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: var(--space-8) 0;
    gap: var(--space-4);
}

.workflow-step {
    flex: 1;
    min-width: 140px;
    text-align: center;
    padding: var(--space-4);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.workflow-step:hover {
    border-color: var(--accent-primary);
}

.workflow-number {
    width: 36px;
    height: 36px;
    background: var(--accent-secondary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin: 0 auto var(--space-3);
}

.workflow-step h4 {
    font-size: 0.875rem;
    margin: var(--space-2) 0;
}

.workflow-step p {
    font-size: 0.8125rem;
    margin: 0;
}

.workflow-arrow {
    color: var(--accent-primary);
    font-size: 1.25rem;
    font-weight: 700;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .workflow-steps {
        flex-direction: column;
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
    }
}

/* ===================================
   RESOURCE LIST
   =================================== */
.resource-list {
    list-style: none;
}

.resource-list li {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--border-secondary);
    color: var(--text-secondary);
}

.resource-list li:last-child {
    border-bottom: none;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--space-12) 0 var(--space-6);
    margin-top: var(--space-16);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-6);
}

.footer-section h3 {
    font-size: 1rem;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.footer-section p {
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid var(--border-secondary);
    padding-top: var(--space-4);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

@media (max-width: 768px) {
    .footer {
        padding: var(--space-8) 0 var(--space-4);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.formula-note {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: var(--space-4);
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
    @page {
        margin: 2cm;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .nav,
    .footer {
        display: none;
    }
    
    .card {
        page-break-inside: avoid;
        border: 1px solid #ddd;
    }
    
    h2 {
        page-break-after: avoid;
    }
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.6s ease-out;
}

/* ===================================
   SCROLLBAR STYLING
   =================================== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: 6px;
    border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-primary);
}