/* ===================================
   TechForge - Management Consulting
   Responsive CSS Stylesheet
   =================================== */

/* CSS Variables */
:root {
    --color-primary: #4f46e5;
    --color-primary-light: #6366f1;
    --color-primary-dark: #4338ca;
    --color-secondary: #9ca3af;
    --color-white: #ffffff;
    --color-black: #111827;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-success: #10b981;

    --font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

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

    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-black);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

.btn-full {
    width: 100%;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-100);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-black);
}

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

.nav-links a {
    font-weight: 500;
    color: var(--color-gray-600);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-700);
    transition: all var(--transition-base);
}

/* Hero Section */
.hero {
    padding: calc(72px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-50) 100%);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content {
    max-width: 560px;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    color: var(--color-black);
}

.hero-text {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.hero-image {
    position: relative;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.hero-illustration {
    width: 100%;
    height: auto;
    display: block;
}

/* Services Section */
.services {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    color: var(--color-gray-600);
    font-size: 1.125rem;
}

.services-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.service-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-slow);
    cursor: pointer;
    text-decoration: none;
    position: relative;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary-light);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    display: flex;
    align-items: flex-start;
    padding-top: var(--spacing-xs);
}

.service-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.service-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-black);
}

.service-description {
    color: var(--color-gray-600);
    line-height: 1.7;
}

.service-link {
    color: var(--color-primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: auto;
}

.service-image {
    display: flex;
    align-items: center;
}

.service-illustration {
    width: 200px;
    height: 150px;
    border-radius: var(--border-radius-md);
}

/* Why Us Section */
.why-us {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.why-us .section-title {
    color: var(--color-white);
    margin-bottom: var(--spacing-2xl);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.stat-number {
    display: block;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

/* Milestone Section */
.milestone {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-gray-50);
}

.milestone-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.milestone-image {
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.milestone-illustration {
    width: 100%;
    height: auto;
    display: block;
}

.milestone-content {
    padding: var(--spacing-lg) 0;
}

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

.milestone-text {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.milestone-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.milestone-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    color: var(--color-gray-700);
}

.milestone-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
    pointer-events: none;
}

/* Contact Section */
.contact {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
}

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

.contact-info {
    padding: var(--spacing-lg) 0;
}

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

.contact-text {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-gray-700);
}

.contact-form {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

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

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

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-gray-700);
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-family);
    font-size: 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

/* Footer */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background-color: var(--color-gray-800);
    color: var(--color-gray-300);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-700);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
}

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

.footer-description {
    color: var(--color-gray-400);
    line-height: 1.7;
    max-width: 300px;
}

.footer-links h4 {
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-gray-400);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-social h4 {
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-gray-700);
    border-radius: var(--border-radius-md);
    color: var(--color-gray-300);
    transition: all var(--transition-base);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

/* Mobile Navigation */
.nav-links.active {
    display: flex;
}

/* ===================================
   Responsive Styles
   =================================== */

/* Tablet (768px+) */
@media (max-width: 1024px) {
    .hero-grid {
        gap: var(--spacing-xl);
    }

    .service-card {
        grid-template-columns: auto 1fr;
    }

    .service-image {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

/* Tablet Portrait */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-gray-200);
        box-shadow: var(--shadow-lg);
    }

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

    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-image {
        order: -1;
        max-width: 400px;
        margin: 0 auto;
    }

    .milestone-grid {
        grid-template-columns: 1fr;
    }

    .milestone-image {
        max-width: 400px;
        margin: 0 auto;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .contact-info {
        text-align: center;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Mobile (320px+) */
@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
        --spacing-3xl: 3rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .service-card {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-item {
        padding: var(--spacing-md);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand .logo {
        justify-content: center;
    }

    .footer-description {
        max-width: 100%;
    }

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

    .contact-form {
        padding: var(--spacing-lg);
    }
}

/* High resolution displays */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }

    .hero {
        padding: calc(72px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    }
}

/* Focus states for accessibility */
a:focus,
button:focus,
input:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Print styles */
@media print {
    .header,
    .mobile-menu-btn,
    .btn,
    .footer-social {
        display: none;
    }

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

    .hero {
        padding-top: var(--spacing-lg);
    }
}