/* MTech Software Solutions - Version 2
   Style: Modern Editorial
   Distinguishing features: Serif headings, warm neutral palette,
   generous whitespace, subtle card elevations, refined typography */

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

/* Custom Properties */
:root {
    /* Warm, sophisticated palette */
    --color-ink: #1c1917;
    --color-ink-light: #44403c;
    --color-ink-muted: #78716c;
    --color-surface: #fafaf9;
    --color-surface-elevated: #ffffff;
    --color-surface-warm: #f5f5f4;
    --color-border: #e7e5e4;
    --color-border-subtle: #f0efed;
    --color-accent: #292524;
    --color-accent-hover: #1c1917;
    
    /* Typography - system fonts as fallback for faster initial render */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    
    /* Spacing scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;
    
    /* Layout */
    --max-width: 1200px;
    --max-width-content: 720px;
    
    /* Effects */
    --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.04);
    --shadow-md: 0 4px 12px rgba(28, 25, 23, 0.06);
    --shadow-lg: 0 8px 24px rgba(28, 25, 23, 0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.2s ease;
}

/* Base */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    /* Improve font rendering on mobile */
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-ink-light);
    background-color: var(--color-surface);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    /* Improve scrolling performance on mobile */
    -webkit-overflow-scrolling: touch;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.25;
}

/* Font display optimization - Google Fonts already includes display=swap in URL */
/* Additional fallback font optimization */

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); }
h3 { font-size: 1.25rem; font-weight: 600; }

p { margin-bottom: var(--space-sm); }
p:last-child { margin-bottom: 0; }

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Section Labels */
.section-label {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-xs);
}

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

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(250, 250, 249, 0.92);
    /* Optimize backdrop-filter for mobile - use simpler version on mobile devices */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-subtle);
    transition: box-shadow var(--transition);
    /* Improve rendering performance */
    will-change: box-shadow;
}

@media (max-width: 768px) {
    .header {
        z-index: 103;
        /* Disable expensive backdrop-filter on mobile for better performance */
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background-color: var(--color-surface);
    }
    
    .nav-container {
        min-height: 60px;
    }
}

.header--scrolled {
    box-shadow: var(--shadow-sm);
}

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

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

.logo {
    height: 38px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
    align-items: center;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-ink-light);
    padding: var(--space-xs) 0;
    transition: color var(--transition);
}

.nav-link:hover {
    color: var(--color-ink);
}

.nav-link--cta {
    background-color: var(--color-accent);
    color: var(--color-surface);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition);
}

.nav-link--cta:hover {
    background-color: var(--color-accent-hover);
    color: var(--color-surface);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-ink);
    transition: all 0.3s ease;
    transform-origin: center;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero */
.hero {
    padding: var(--space-3xl) 0;
    background-color: var(--color-surface);
}

.hero-content {
    max-width: 800px;
}

.hero-label {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--color-ink);
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-ink-light);
    max-width: 640px;
    margin-bottom: var(--space-md);
}

.hero-intro {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-ink-light);
    max-width: 680px;
    margin-bottom: var(--space-lg);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background-color: var(--color-accent);
    color: var(--color-surface);
    font-weight: 500;
    font-size: 1rem;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition), transform var(--transition);
}

.hero-cta:hover {
    background-color: var(--color-accent-hover);
    color: var(--color-surface);
    transform: translateY(-1px);
}

/* Services */
.services {
    padding: var(--space-3xl) 0;
    background-color: var(--color-surface-warm);
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.service-card {
    background-color: var(--color-surface-elevated);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition);
    /* Optimize for mobile - use transform3d for GPU acceleration */
    transform: translateZ(0);
}

.service-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.service-card .service-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.service-description {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-ink-light);
    margin-bottom: var(--space-sm);
}

.service-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.service-list li {
    position: relative;
    padding-left: 1.25rem;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-ink-light);
    margin-bottom: var(--space-xs);
}

.service-list li:last-child {
    margin-bottom: 0;
}

.service-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background-color: var(--color-ink-muted);
}

/* Capabilities */
.capabilities {
    padding: var(--space-3xl) 0;
    background-color: var(--color-surface);
}

.capabilities-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-2xl);
    align-items: start;
}

.capabilities-header {
    position: sticky;
    top: calc(var(--space-xl) + 60px);
}

.capabilities-intro {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-ink-light);
}

.capabilities-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.capability-item {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.capability-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.capability-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.capability-description {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-ink-light);
}

.capability-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.capability-list li {
    position: relative;
    padding-left: 1.25rem;
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-ink-light);
    margin-bottom: var(--space-xs);
}

.capability-list li:last-child {
    margin-bottom: 0;
}

.capability-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background-color: var(--color-ink-muted);
}

/* How I Work */
.how-i-work {
    padding: var(--space-3xl) 0;
    background-color: var(--color-surface-warm);
}

.how-i-work-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-2xl);
    align-items: start;
}

.how-i-work-header {
    position: sticky;
    top: calc(var(--space-xl) + 60px);
}

.how-i-work-intro {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-ink-light);
    margin-top: var(--space-md);
}

.how-i-work-content {
    max-width: var(--max-width-content);
}

.how-i-work-list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-md) 0;
}

.how-i-work-list li {
    position: relative;
    padding-left: 1.5rem;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-ink-light);
    margin-bottom: var(--space-sm);
}

.how-i-work-list li:last-child {
    margin-bottom: 0;
}

.how-i-work-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-ink-muted);
}

.how-i-work-closing {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-ink);
    font-weight: 500;
    margin-top: var(--space-md);
}

/* About */
.about {
    padding: var(--space-3xl) 0;
    background-color: var(--color-surface);
}

.about-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    align-items: start;
}

.about-content {
    max-width: var(--max-width-content);
}

.about-lead {
    font-size: 1.1875rem;
    line-height: 1.7;
    color: var(--color-ink);
    margin-bottom: var(--space-md);
}

.about-content p {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-ink-light);
    margin-bottom: var(--space-md);
}

/* Contact */
.contact {
    padding: var(--space-3xl) 0;
    background-color: var(--color-surface);
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-2xl);
    align-items: start;
}

.contact-intro {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-ink-light);
}

.contact-form-wrapper {
    background-color: var(--color-surface-elevated);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-ink);
}

.form-input,
.form-textarea {
    font-family: var(--font-sans);
    font-size: 1rem;
    padding: var(--space-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: var(--color-surface);
    color: var(--color-ink);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-ink-muted);
    box-shadow: 0 0 0 3px rgba(120, 113, 108, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    align-self: flex-start;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    padding: var(--space-sm) var(--space-lg);
    background-color: var(--color-accent);
    color: var(--color-surface);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition);
}

.form-submit:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
}

.form-submit:active {
    transform: translateY(0);
}

.form-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.form-message {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--space-sm);
    animation: slideIn 0.3s ease;
}

.form-message--success {
    background-color: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.form-message--error {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translate3d(0, -10px, 0); /* Use translate3d for GPU acceleration */
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

/* Footer */
.footer {
    padding: var(--space-xl) 0;
    background-color: var(--color-surface-warm);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    height: 32px;
    width: auto;
    margin-bottom: var(--space-xs);
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin: 0;
    max-width: 320px;
}

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

.footer-text {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    margin: 0;
}

.footer-text--secondary {
    font-size: 0.8125rem;
    color: var(--color-ink-muted);
    margin-top: var(--space-xs);
}

/* Responsive Design */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --space-xl: 3rem;
        --space-2xl: 4rem;
        --space-3xl: 5rem;
    }
    
    .capabilities-layout,
    .how-i-work-layout,
    .about-layout,
    .contact-layout {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .capabilities-header,
    .how-i-work-header {
        position: static;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 2.5rem;
        --space-2xl: 3rem;
        --space-3xl: 4rem;
    }
    
    .container {
        padding: 0 var(--space-sm);
    }
    
    .nav-container {
        padding: var(--space-sm) var(--space-md);
    }
    
    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
        z-index: 103;
        position: relative;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        width: 100%;
        height: auto;
        max-height: calc(100vh - 60px);
        max-height: calc(100dvh - 60px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        gap: 0;
        background-color: var(--color-surface);
        padding-top: var(--space-lg);
        padding-left: var(--space-md);
        padding-right: var(--space-md);
        padding-bottom: var(--space-lg);
        margin: 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
        z-index: 101;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        box-shadow: var(--shadow-lg);
        border-bottom-left-radius: var(--radius-md);
        border-bottom-right-radius: var(--radius-md);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
        padding: 0;
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .nav-menu li:first-child {
        margin-top: var(--space-sm);
    }
    
    .nav-link {
        font-size: 1.375rem;
        font-weight: 500;
        display: flex;
        align-items: center;
        padding: var(--space-lg) 0;
        width: 100%;
        text-align: left;
        color: var(--color-ink);
        min-height: 56px;
    }
    
    .nav-link:hover {
        color: var(--color-ink);
    }
    
    .nav-link--cta {
        background-color: var(--color-accent);
        color: var(--color-surface);
        padding: var(--space-lg) var(--space-xl);
        border-radius: var(--radius-md);
        text-align: center;
        margin-top: var(--space-lg);
        justify-content: center;
        min-height: 56px;
        font-size: 1.25rem;
    }
    
    .nav-link--cta:hover {
        background-color: var(--color-accent-hover);
        color: var(--color-surface);
    }
    
    
    /* Hero Mobile */
    .hero {
        padding: var(--space-2xl) 0;
    }
    
    .hero-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    /* Services Mobile */
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .service-card {
        padding: var(--space-md);
    }
    
    /* Capabilities Mobile */
    .capabilities-content {
        gap: var(--space-md);
    }
    
    .capability-item {
        padding-bottom: var(--space-md);
    }
    
    /* Contact Mobile */
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        padding: var(--space-md);
    }
    
    /* Footer Mobile */
    .footer-content {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }
    
    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .footer-tagline {
        text-align: center;
        max-width: 100%;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 2.5rem;
        --space-3xl: 3rem;
    }
    
    .hero-cta {
        width: 100%;
        justify-content: center;
    }
    
    .form-submit {
        width: 100%;
    }
    
    .logo {
        height: 32px;
    }
    
    .service-card .service-title {
        font-size: 1.125rem;
    }
    
    .service-description {
        font-size: 0.875rem;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .service-card:hover {
        transform: none;
        box-shadow: var(--shadow-sm);
    }
    
    .hero-cta:hover,
    .form-submit:hover {
        transform: none;
    }
    
    /* Larger touch targets */
    .nav-link {
        padding: var(--space-sm) 0;
    }
    
    .form-input,
    .form-textarea {
        min-height: 48px;
        font-size: 16px; /* Prevents iOS zoom */
    }
    
    .form-submit {
        min-height: 48px;
    }
    
    /* Reduce animations on touch devices for better performance */
    * {
        animation-duration: 0.2s !important;
        transition-duration: 0.2s !important;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .nav-toggle,
    .hero-cta,
    .contact-form-wrapper {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }
    
    section {
        page-break-inside: avoid;
    }
}