/* ========================================
   SLIPSTREAM CONSULTING - MAIN STYLESHEET
   Theme: Light Grey, Dark Grey, Red Accent
   ======================================== */

:root {
    /* Color Palette */
    --color-dark-grey: #1a1a1a;
    --color-charcoal: #2d2d2d;
    --color-medium-grey: #4a4a4a;
    --color-slate: #6b6b6b;
    --color-light-grey: #e8e8e8;
    --color-off-white: #f5f5f5;
    --color-white: #ffffff;
    --color-red: #c41e3a;
    --color-red-dark: #9a1830;
    --color-red-light: #e63950;
    
    /* Typography */
    --font-heading: 'Rajdhani', sans-serif;
    --font-body: 'Source Sans 3', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Borders */
    --border-thin: 1px solid var(--color-red);
    --border-accent: 2px solid var(--color-red);
    
    /* Shadows */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.15);
    --shadow-strong: 0 12px 40px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-dark-grey);
    background-color: var(--color-off-white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-dark-grey);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.accent {
    color: var(--color-red);
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-dark-grey);
    border-bottom: var(--border-thin);
    padding: var(--spacing-sm) 0;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    color: var(--color-red);
    display: flex;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
}

.nav-list a {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-light-grey);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-red);
    transition: var(--transition-medium);
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--color-white);
}

.nav-list a:hover::after,
.nav-list a.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-white);
    transition: var(--transition-fast);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: var(--border-thin);
    cursor: pointer;
    transition: var(--transition-medium);
}

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

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

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

.btn-secondary:hover {
    background: var(--color-red);
    color: var(--color-white);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-dark-grey) 0%, var(--color-charcoal) 100%);
    background-image: url('https://images.unsplash.com/photo-1518770660439-4636190af475?w=1920&h=1080&fit=crop');
    background-size: cover;
    background-position: center;
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.92) 0%, rgba(45, 45, 45, 0.88) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-md);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 2px;
}

.tagline {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-light-grey);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   PAGE HERO (Interior Pages)
   ======================================== */

.page-hero {
    padding: calc(var(--spacing-xl) + 60px) 0 var(--spacing-lg);
    background: var(--color-dark-grey);
    text-align: center;
    border-bottom: var(--border-thin);
}

.page-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.page-hero p {
    color: var(--color-light-grey);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   ABOUT SECTION
   ======================================== */

.about-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

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

.content-block h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.content-block p {
    color: var(--color-medium-grey);
    margin-bottom: var(--spacing-sm);
}

.stats-row {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: var(--border-thin);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-red);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-slate);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.image-block {
    position: relative;
}

.image-block img {
    border: var(--border-thin);
    box-shadow: var(--shadow-medium);
}

.image-accent {
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    border: var(--border-thin);
    z-index: -1;
}

/* ========================================
   HIGHLIGHTS SECTION
   ======================================== */

.highlights-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-off-white);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.highlight-card {
    background: var(--color-white);
    padding: var(--spacing-md);
    border: 1px solid var(--color-light-grey);
    border-left: 3px solid var(--color-red);
    transition: var(--transition-medium);
}

.highlight-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--color-red);
}

.highlight-icon {
    color: var(--color-red);
    margin-bottom: var(--spacing-sm);
}

.highlight-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.highlight-card p {
    color: var(--color-slate);
    font-size: 0.95rem;
}

/* ========================================
   CTA SECTION
   ======================================== */

.cta-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-dark-grey);
    text-align: center;
    border-top: var(--border-thin);
    border-bottom: var(--border-thin);
}

.cta-content h2 {
    font-size: 2rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    color: var(--color-light-grey);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   SERVICES PAGE
   ======================================== */

.services-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.services-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.services-intro h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.services-intro p {
    color: var(--color-slate);
}

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

.service-card {
    background: var(--color-off-white);
    padding: var(--spacing-md);
    border: 1px solid var(--color-light-grey);
    border-top: 3px solid var(--color-red);
    display: flex;
    gap: var(--spacing-sm);
    transition: var(--transition-medium);
}

.service-card:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-soft);
    transform: translateY(-3px);
}

.service-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--color-dark-grey);
    border: var(--border-thin);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-red);
}

.service-content h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.service-content p {
    color: var(--color-slate);
    font-size: 0.9rem;
}

.services-image {
    margin-top: var(--spacing-lg);
    position: relative;
}

.services-image img {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border: var(--border-thin);
}

/* ========================================
   BENEFITS PAGE
   ======================================== */

.benefits-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.benefits-content h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

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

.benefit-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-off-white);
    border-left: 3px solid var(--color-red);
    transition: var(--transition-fast);
}

.benefit-item:hover {
    background: var(--color-light-grey);
}

.benefit-number {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-red);
    min-width: 40px;
}

.benefit-text h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.benefit-text p {
    color: var(--color-slate);
    font-size: 0.9rem;
}

.benefits-image {
    position: sticky;
    top: 100px;
}

.benefits-image img {
    border: var(--border-thin);
    box-shadow: var(--shadow-medium);
}

/* ========================================
   PROJECTS PAGE
   ======================================== */

.projects-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.projects-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.projects-intro h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.project-card {
    background: var(--color-charcoal);
    padding: var(--spacing-md);
    border: var(--border-thin);
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-red), var(--color-red-light));
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-strong);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: var(--color-dark-grey);
    border: var(--border-thin);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-red);
}

.project-card h3 {
    font-size: 1.1rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.project-card p {
    color: var(--color-light-grey);
    font-size: 0.9rem;
}

.project-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--color-dark-grey), var(--color-charcoal));
}

.project-card.featured .project-icon {
    width: 80px;
    height: 80px;
}

.project-card.featured h3 {
    font-size: 1.5rem;
}

.projects-image {
    margin-top: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.projects-image img {
    border: var(--border-thin);
    height: 250px;
    object-fit: cover;
}

/* ========================================
   CONTACT PAGE
   ======================================== */

.contact-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

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

.contact-info h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.contact-info p {
    color: var(--color-slate);
    margin-bottom: var(--spacing-md);
}

.contact-details {
    background: var(--color-dark-grey);
    padding: var(--spacing-md);
    border: var(--border-thin);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-charcoal);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--color-charcoal);
    border: var(--border-thin);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-red);
    flex-shrink: 0;
}

.contact-text {
    color: var(--color-light-grey);
}

.contact-text strong {
    display: block;
    color: var(--color-white);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.contact-text a {
    color: var(--color-red);
}

.contact-text a:hover {
    color: var(--color-red-light);
}

.contact-image {
    position: relative;
}

.contact-image img {
    border: var(--border-thin);
    box-shadow: var(--shadow-medium);
    height: 100%;
    object-fit: cover;
}

/* ========================================
   FOOTER
   ======================================== */

.main-footer {
    background: var(--color-dark-grey);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: var(--border-thin);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-charcoal);
}

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

.footer-tagline {
    color: var(--color-slate);
    font-size: 0.9rem;
}

.footer-links h4,
.footer-contact h4,
.footer-expertise h4 {
    color: var(--color-white);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.footer-links a {
    color: var(--color-slate);
    font-size: 0.9rem;
}

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

.footer-contact p {
    color: var(--color-slate);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.footer-contact a {
    color: var(--color-red);
}

.footer-contact a:hover {
    color: var(--color-red-light);
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.expertise-tags span {
    background: var(--color-charcoal);
    color: var(--color-light-grey);
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--color-medium-grey);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    color: var(--color-slate);
    font-size: 0.85rem;
}

.footer-site {
    color: var(--color-red);
}

/* ========================================
   RESPONSIVE STYLES
   ======================================== */

@media (max-width: 992px) {
    .section-grid,
    .contact-grid,
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .project-card.featured {
        grid-column: span 2;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .image-block {
        order: -1;
    }
}

@media (max-width: 768px) {
    .main-nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-dark-grey);
        border-bottom: var(--border-thin);
        padding: var(--spacing-md);
        transform: translateY(-150%);
        opacity: 0;
        transition: var(--transition-medium);
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .highlights-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .stats-row {
        flex-wrap: wrap;
    }
    
    .projects-image {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .section-title,
    .content-block h2 {
        font-size: 1.75rem;
    }
}