/* ============================================
   SEMHYS ENGINEERING - MAIN STYLESHEET
   Modern, Technical, Premium B2B Design
   ============================================ */

/* ============================================
   1. CSS VARIABLES & DESIGN TOKENS
   ============================================ */
:root {
    /* Colors - Primary Palette */
    --color-primary: #004e92;
    --color-primary-light: #0066cc;
    --color-primary-dark: #003366;

    /* Colors - Secondary Palette */
    --color-secondary: #ff6b00;
    --color-secondary-light: #ff8533;
    --color-secondary-dark: #cc5500;

    /* Colors - Neutrals */
    --color-dark: #1a1a1a;
    --color-gray-dark: #4a4a4a;
    --color-gray: #7a7a7a;
    --color-gray-light: #e0e0e0;
    --color-light: #f4f4f4;
    --color-white: #ffffff;

    /* Colors - Semantic */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-error: #dc3545;
    --color-info: #17a2b8;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #004e92 0%, #0066cc 100%);
    --gradient-secondary: linear-gradient(135deg, #ff6b00 0%, #ff8533 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Roboto Mono', 'Courier New', monospace;

    --font-size-xs: 0.75rem;
    /* 12px */
    --font-size-sm: 0.875rem;
    /* 14px */
    --font-size-base: 1rem;
    /* 16px */
    --font-size-lg: 1.125rem;
    /* 18px */
    --font-size-xl: 1.25rem;
    /* 20px */
    --font-size-2xl: 1.5rem;
    /* 24px */
    --font-size-3xl: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-semibold: 600;
    --font-weight-bold: 800;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    /* 4px */
    --spacing-sm: 0.5rem;
    /* 8px */
    --spacing-md: 1rem;
    /* 16px */
    --spacing-lg: 1.5rem;
    /* 24px */
    --spacing-xl: 2rem;
    /* 32px */
    --spacing-2xl: 3rem;
    /* 48px */
    --spacing-3xl: 4rem;
    /* 64px */
    --spacing-4xl: 6rem;
    /* 96px */

    /* Border Radius */
    --radius-sm: 0.25rem;
    /* 4px */
    --radius-md: 0.5rem;
    /* 8px */
    --radius-lg: 1rem;
    /* 16px */
    --radius-full: 9999px;

    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Breakpoints (for reference in media queries) */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;

    /* Container */
    --container-max-width: 1280px;
    --container-padding: var(--spacing-lg);
}

/* ============================================
   2. RESET & BASE STYLES
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-dark);
    background-color: var(--color-white);
    overflow-x: hidden;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-5xl);
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-3xl);
}

h4 {
    font-size: var(--font-size-2xl);
}

h5 {
    font-size: var(--font-size-xl);
}

h6 {
    font-size: var(--font-size-lg);
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

strong,
b {
    font-weight: var(--font-weight-semibold);
}

code,
pre {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

/* ============================================
   4. LAYOUT COMPONENTS
   ============================================ */

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Section */
.section {
    padding: var(--spacing-4xl) 0;
}

.section-sm {
    padding: var(--spacing-3xl) 0;
}

.section-lg {
    padding: calc(var(--spacing-4xl) * 1.5) 0;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Flexbox Utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

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

.justify-between {
    justify-content: space-between;
}

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

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

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

.gap-xl {
    gap: var(--spacing-xl);
}

/* ============================================
   5. COMPONENTS
   ============================================ */

/* Card */
.card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.card-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark);
}

.card-text {
    font-size: var(--font-size-base);
    color: var(--color-gray-dark);
    line-height: var(--line-height-relaxed);
}

/* Button */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--color-white);
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--color-white);
    border-color: var(--color-secondary);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--color-white);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* Section Title */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title h2 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.section-title .subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray);
    margin-bottom: var(--spacing-md);
}

.section-title .line {
    width: 80px;
    height: 4px;
    background: var(--gradient-secondary);
    margin: 0 auto;
    border-radius: var(--radius-full);
}

/* Stats */
.stat {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: var(--color-gray-dark);
    font-weight: var(--font-weight-semibold);
}

/* Badge */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    background: var(--color-light);
    color: var(--color-dark);
}

.badge-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.badge-secondary {
    background: var(--color-secondary);
    color: var(--color-white);
}

/* ============================================
   6. NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-base);
}

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

.navbar-logo {
    display: flex;
    align-items: center;
}

.navbar-logo img {
    height: 60px;
    width: auto;
    transition: transform var(--transition-base);
}

.navbar-logo:hover img {
    transform: scale(1.05);
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.navbar-link {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-dark);
    transition: color var(--transition-fast);
}

.navbar-link:hover,
.navbar-link.active {
    color: var(--color-primary);
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.navbar-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-dark);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

/* ============================================
   7. HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-4xl) var(--container-padding);
    margin-top: 70px;
    /* Navbar height */
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,112C672,96,768,96,864,112C960,128,1056,160,1152,160C1248,160,1344,128,1392,112L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') bottom center no-repeat;
    background-size: cover;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-lg);
    color: var(--color-white);
}

.hero p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   8. FOOTER
   ============================================ */
.footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-sm);
}

.footer-section a:hover {
    color: var(--color-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

/* ============================================
   9. RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --spacing-4xl: 3rem;
    }

    .navbar-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-xl);
        box-shadow: var(--shadow-xl);
        transition: left var(--transition-base);
    }

    .navbar-menu.active {
        left: 0;
    }

    .navbar-toggle {
        display: flex;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .hero {
        min-height: 500px;
    }
}

@media (max-width: 640px) {
    :root {
        --container-padding: var(--spacing-md);
        --spacing-4xl: 2rem;
    }

    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .hero p {
        font-size: var(--font-size-base);
    }
}

/* ============================================
   10. UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

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

.text-right {
    text-align: right;
}

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

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

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

.bg-primary {
    background: var(--color-primary);
}

.bg-secondary {
    background: var(--color-secondary);
}

.bg-light {
    background: var(--color-light);
}

.bg-dark {
    background: var(--color-dark);
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

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

.mt-xl {
    margin-top: var(--spacing-xl);
}

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

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

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

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.hidden {
    display: none;
}

.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

/* ============================================
   11. BLOG & MODAL ENHANCEMENTS
   ============================================ */
.blog-controls input:focus,
.blog-controls select:focus {
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 3px rgba(0, 78, 146, 0.1);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--color-white);
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    position: relative;
    padding: var(--spacing-3xl);
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlide 0.4s ease-out;
}

@keyframes modalSlide {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2.5rem;
    background: none;
    border: none;
    color: var(--color-gray);
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--color-error);
}

/* Markdown Styling in Modal */
.markdown-body {
    line-height: 1.8;
    color: var(--color-dark);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.markdown-body p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
}

.markdown-body ul,
.markdown-body ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.markdown-body li {
    margin-bottom: 0.5rem;
}

.markdown-body blockquote {
    border-left: 4px solid var(--color-primary-light);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--color-gray-dark);
}

@media (max-width: 768px) {
    .modal-content {
        padding: var(--spacing-xl);
        width: 95%;
    }

    .modal-content h1 {
        font-size: 1.8rem;
    }
}

/* ============================================
   12. ACCESSIBILITY — WCAG 2.1
   ============================================ */

/* Skip navigation link */
.skip-nav {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
    z-index: -1;
}

.skip-nav:focus {
    position: fixed;
    top: 0;
    left: 0;
    width: auto;
    height: auto;
    padding: var(--spacing-md) var(--spacing-2xl);
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    z-index: 9999;
    text-decoration: none;
    border-radius: 0 0 var(--radius-md) 0;
    box-shadow: var(--shadow-lg);
}

/* Screen reader only utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Global focus-visible styles — keyboard navigation indicator */
:focus-visible {
    outline: 3px solid var(--color-secondary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Navbar toggle as button — reset default button styles */
button.navbar-toggle {
    background: none;
    border: none;
    padding: var(--spacing-xs);
    cursor: pointer;
}

button.navbar-toggle:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Logo image sizing — consistent across all pages */
.navbar-logo img {
    height: 46px;
    width: auto;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}