/* Hardware Asset Management - Enhanced Design System */
/* CSS Variables for consistency and easy theming */
:root {
    /* Brand Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;

    /* Accent Colors */
    --color-accent: #06b6d4;
    --color-accent-dark: #0891b2;

    /* Text Colors */
    --color-text: #0f172a;
    --color-text-light: #64748b;
    --color-text-lighter: #94a3b8;

    /* Background Colors */
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-elevated: #ffffff;

    /* Border Colors */
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Success/Warning/Error */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Fonts */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Consolas', 'Courier New', monospace;

    /* Layout */
    --max-width: 1200px;
    --max-width-content: 800px;
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--color-text);
    background-color: var(--color-bg-alt);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.75rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 800;
}

h2 {
    font-size: 2.25rem;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

h3 {
    font-size: 1.75rem;
    margin-top: var(--spacing-xl);
    font-weight: 600;
}

h4 {
    font-size: 1.375rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
}

strong {
    font-weight: 600;
    color: var(--color-text);
}

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

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Header and Navigation */
header {
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.375rem;
    font-weight: 800;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    letter-spacing: -0.03em;
}

.logo:hover {
    text-decoration: none;
    color: var(--color-primary-dark);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    color: var(--color-text-light);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
    font-size: 0.9375rem;
}

.nav-links a:hover {
    background-color: var(--color-primary-50);
    color: var(--color-primary);
    text-decoration: none;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    margin: 5px 0;
    transition: 0.3s;
}

/* Main Content */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    background-color: var(--color-bg);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: -2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 800px;
    height: 200px;
    background: radial-gradient(ellipse at center, var(--color-primary-50) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.375rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.6;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    font-size: 1.0625rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}

.cta-button:active {
    transform: translateY(0);
}

/* Table of Contents */
.toc {
    background: linear-gradient(135deg, var(--color-primary-50) 0%, #ffffff 100%);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.toc h2 {
    font-size: 1.375rem;
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-dark);
}

.toc ul {
    list-style: none;
}

.toc li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-lg);
    position: relative;
}

.toc li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 600;
}

.toc a {
    color: var(--color-text);
    font-weight: 500;
}

.toc a:hover {
    color: var(--color-primary);
}

/* Content Sections */
section {
    margin-bottom: var(--spacing-3xl);
}

article {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

/* Lists */
ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

li {
    margin-bottom: var(--spacing-sm);
}

li::marker {
    color: var(--color-primary);
}

/* Images and Figures */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

svg {
    max-width: 100%;
    height: auto;
}

figure {
    margin: var(--spacing-xl) 0;
}

figcaption {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    font-style: italic;
    margin-top: var(--spacing-sm);
    text-align: center;
}

/* Cards and Boxes */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
}

.card {
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
    border-color: var(--color-primary-100);
}

.card:hover::before {
    transform: scaleX(1);
}

.card h3 {
    margin-top: 0;
    font-size: 1.5rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.card p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.card a {
    color: var(--color-primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
}

.card a:hover {
    gap: 0.75rem;
}

.card-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
    max-width: 48px;
    max-height: 48px;
    margin-bottom: var(--spacing-md);
    display: block;
    flex-shrink: 0;
}

/* Highlight Boxes */
.highlight-box {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.warning-box {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    border-left: 4px solid var(--color-warning);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

/* Tables */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: var(--spacing-xl) 0;
    font-size: 0.9375rem;
    background-color: var(--color-bg-elevated);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

thead {
    background: linear-gradient(180deg, var(--color-bg-alt) 0%, #ffffff 100%);
}

th {
    padding: var(--spacing-md) var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    padding: var(--spacing-md) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-light);
}

tbody tr {
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background-color: var(--color-primary-50);
}

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

/* Code */
code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--color-bg-alt);
    padding: 0.25em 0.5em;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

/* Footer */
footer {
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    color: #e2e8f0;
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: #ffffff;
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-section p {
    color: #cbd5e1;
    line-height: 1.7;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: #cbd5e1;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: #ffffff;
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: var(--spacing-lg);
    text-align: center;
    font-size: 0.9375rem;
    color: #94a3b8;
}

/* Breadcrumbs */
.breadcrumbs {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-lighter);
    padding: var(--spacing-sm) 0;
}

.breadcrumbs a {
    color: var(--color-text-light);
    transition: color 0.2s ease;
}

.breadcrumbs a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: var(--spacing-xl) auto;
}

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

label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-size: 0.9375rem;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all 0.2s ease;
    background-color: var(--color-bg);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

textarea {
    resize: vertical;
    min-height: 150px;
}

button[type="submit"] {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

button[type="submit"]:active {
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero {
        padding: var(--spacing-2xl) 0 var(--spacing-xl);
    }

    h2 {
        font-size: 1.875rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    .menu-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        gap: 0;
    }

    .nav-links a {
        width: 100%;
        padding: var(--spacing-md);
    }

    .nav-links.active {
        display: flex;
    }

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

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

    main {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    table {
        font-size: 0.875rem;
    }

    th, td {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.625rem;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero h1 {
        font-size: 1.875rem;
    }
}

/* Print Styles */
@media print {
    header, footer, .toc, .cta-button {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        background: white;
    }

    a {
        color: var(--color-text);
        text-decoration: underline;
    }

    .card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}