/* =============================================
   SOURCE SOLUTIONS - Main Stylesheet
   Part 1: CSS Variables & Base Styles
   ============================================= */

/* CSS Custom Properties (Variables) */
:root {
    /* Brand Colors */
    --color-primary: #ffb81c;
    --color-primary-dark: #e5a419;
    --color-primary-light: #ffc94d;
    --color-dark: #11111f;
    --color-dark-lighter: #1a1a2e;
    --color-dark-lightest: #252540;
    
    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --line-height-base: 1.6;
    --line-height-tight: 1.2;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    --header-height: 80px;
    
    /* Borders & Shadows */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* CSS Reset & Base Styles */
*,
*::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: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-gray-100);
    background-color: var(--color-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-300);
}

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

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

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

ul, ol {
    list-style: none;
}

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

/* Section Styling */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-2xl);
}

.section-header--center {
    text-align: center;
}

.section-tag {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-400);
    max-width: 600px;
}

.section-header--center .section-description {
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--border-radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-dark);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }

/* Responsive Typography */
@media (min-width: 768px) {
    :root {
        --container-padding: 2rem;
    }
    
    h1 { font-size: var(--font-size-4xl); }
    h2 { font-size: var(--font-size-3xl); }
    h3 { font-size: var(--font-size-2xl); }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    section {
        padding: var(--spacing-4xl) 0;
    }
}

@media (min-width: 1024px) {
    h1 { font-size: var(--font-size-5xl); }
}

/* =============================================
   Part 2: Header & Navigation
   ============================================= */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    background-color: transparent;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
    background-color: var(--color-dark);
    box-shadow: var(--shadow-lg);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    z-index: 1001;
}

.logo img {
    height: 32px;
    width: auto;
}

@media (min-width: 768px) {
    .logo img {
        height: 40px;
    }
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger {
    position: relative;
    width: 24px;
    height: 2px;
    background-color: var(--color-white);
    transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background-color: var(--color-white);
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* Hamburger Animation */
.nav-toggle.active .hamburger {
    background-color: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation Menu */
.nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--color-dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    transition: right var(--transition-base);
}

.nav-menu.active {
    right: 0;
}

.nav-link {
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: color var(--transition-fast);
}

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

.nav-link--cta {
    background-color: var(--color-primary);
    color: var(--color-dark);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-lg);
}

.nav-link--cta:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-dark);
}

/* Desktop Navigation */
@media (min-width: 1024px) {
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background-color: transparent;
        flex-direction: row;
        gap: var(--spacing-md);
    }
    
    .nav-link {
        font-size: var(--font-size-sm);
    }
}

/* Larger desktop - more spacing */
@media (min-width: 1200px) {
    .nav-menu {
        gap: var(--spacing-lg);
    }
    
    .nav-link {
        font-size: var(--font-size-base);
    }
}

/* =============================================
   Part 3: Hero Section
   ============================================= */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-lighter) 50%, var(--color-dark-lightest) 100%);
    z-index: -2;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, transparent 0%, var(--color-dark) 70%);
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    padding: var(--spacing-xl);
    z-index: 1;
}

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

.hero-title-accent {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 400;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.hero-title-main {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-300);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.scroll-indicator:hover {
    color: var(--color-primary);
}

.scroll-indicator-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 20%, 50%, 80%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    40% {
        transform: rotate(45deg) translateY(10px);
    }
    60% {
        transform: rotate(45deg) translateY(5px);
    }
}

/* Hero Responsive */
@media (min-width: 768px) {
    .hero-title-accent {
        font-size: var(--font-size-2xl);
    }
    
    .hero-title-main {
        font-size: var(--font-size-4xl);
    }
    
    .hero-cta {
        flex-direction: row;
        justify-content: center;
    }
}

@media (min-width: 1024px) {
    .hero-title-accent {
        font-size: var(--font-size-2xl);
    }
    
    .hero-title-main {
        font-size: var(--font-size-5xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-xl);
    }
}

/* =============================================
   Part 4: About Section
   ============================================= */

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

.about-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

.about-content {
    order: 2;
}

.about-lead {
    font-size: var(--font-size-lg);
    color: var(--color-gray-200);
    margin-bottom: var(--spacing-lg);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-dark-lightest);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
}

.about-image {
    order: 1;
}

.about-image-wrapper {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.about-image-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary) 0%, transparent 50%);
    opacity: 0.2;
    z-index: 1;
}

.about-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 4/3;
}

/* About Responsive */
@media (min-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
    
    .about-content {
        order: 1;
    }
    
    .about-image {
        order: 2;
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
}

/* =============================================
   Part 5: Services Section
   ============================================= */

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

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

.service-card {
    background-color: var(--color-dark-lighter);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    border: 1px solid transparent;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark-lightest);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
    transition: background-color var(--transition-base);
}

.service-card:hover .service-icon {
    background-color: var(--color-primary);
    color: var(--color-dark);
}

.service-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.service-description {
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-lg);
}

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

.service-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-gray-300);
}

.service-features li::before {
    content: '';
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
    flex-shrink: 0;
}

/* Services Responsive */
@media (min-width: 768px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Make last 2 cards take center if 5 cards */
    .services-grid .service-card:nth-child(4) {
        grid-column: 1 / 2;
    }
    
    .services-grid .service-card:nth-child(5) {
        grid-column: 2 / 3;
    }
}

/* Center the last row for 5 items */
@media (min-width: 1024px) {
    .services-grid {
        justify-items: center;
    }
    
    .services-grid .service-card:nth-child(4),
    .services-grid .service-card:nth-child(5) {
        max-width: 100%;
    }
}

/* =============================================
   Part 6: Portfolio Section
   ============================================= */

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

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

.portfolio-card {
    background-color: var(--color-dark);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.portfolio-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.portfolio-card:hover .portfolio-image img {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(17, 17, 31, 0.9) 0%, transparent 50%);
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-lg);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.portfolio-card:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-category {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-dark);
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-sm);
}

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

.portfolio-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.portfolio-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    margin-bottom: 0;
}

/* Portfolio Responsive */
@media (min-width: 768px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
}

/* =============================================
   Part 7: Process Section
   ============================================= */

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

.process-timeline {
    display: grid;
    gap: var(--spacing-xl);
    position: relative;
}

.process-step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    position: relative;
}

.process-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark-lighter);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    position: relative;
    z-index: 1;
}

/* Connecting line between steps */
.process-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 29px;
    top: 60px;
    width: 2px;
    height: calc(100% + var(--spacing-xl) - 60px);
    background: linear-gradient(to bottom, var(--color-primary), var(--color-dark-lightest));
}

.process-content {
    flex: 1;
    padding-top: var(--spacing-sm);
}

.process-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.process-description {
    color: var(--color-gray-400);
    margin-bottom: 0;
}

/* Process Responsive */
@media (min-width: 768px) {
    .process-timeline {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-2xl);
    }
    
    .process-step:not(:last-child)::after {
        display: none;
    }
    
    .process-step {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
    
    .process-number {
        width: 80px;
        height: 80px;
        font-size: var(--font-size-2xl);
        margin-bottom: var(--spacing-md);
    }
    
    .process-content {
        padding-top: 0;
    }
}

@media (min-width: 1024px) {
    .process-timeline {
        grid-template-columns: repeat(4, 1fr);
    }
    
    /* Add horizontal connecting lines on desktop */
    .process-step:not(:last-child)::after {
        display: block;
        left: calc(50% + 50px);
        top: 40px;
        width: calc(100% - 60px);
        height: 2px;
    }
}

/* =============================================
   Part 8: Contact Section
   ============================================= */

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

.contact-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

.contact-lead {
    font-size: var(--font-size-lg);
    color: var(--color-gray-300);
    margin-bottom: var(--spacing-2xl);
}

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

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark-lightest);
    border-radius: var(--border-radius-md);
    color: var(--color-primary);
}

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

.contact-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.contact-text a,
.contact-text span {
    color: var(--color-white);
    font-size: var(--font-size-base);
}

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

/* Contact Form */
.contact-form-wrapper {
    background-color: var(--color-dark);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
}

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

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

.form-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-300);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-white);
    background-color: var(--color-dark-lighter);
    border: 1px solid var(--color-dark-lightest);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder {
    color: var(--color-gray-600);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(255, 184, 28, 0.1);
}

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

/* Form validation states - subtle feedback */
.form-input:focus:invalid:not(:placeholder-shown) {
    border-color: var(--color-gray-500);
}

.form-input:valid:not(:placeholder-shown) {
    border-color: var(--color-dark-lightest);
}

.form-input:focus:valid:not(:placeholder-shown) {
    border-color: var(--color-primary);
}

/* Form error highlight */
.form-input--error {
    border-color: #dc3545 !important;
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15) !important;
}

/* Form Status Messages */
.form-status {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: center;
}

.form-status--success {
    background-color: rgba(40, 167, 69, 0.15);
    border: 1px solid rgba(40, 167, 69, 0.3);
    color: #28a745;
}

.form-status--error {
    background-color: rgba(220, 53, 69, 0.15);
    border: 1px solid rgba(220, 53, 69, 0.3);
    color: #dc3545;
}

/* Button loading state */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Contact Responsive */
@media (min-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3xl);
        align-items: start;
    }
    
    .contact-form-wrapper {
        padding: var(--spacing-2xl);
    }
}

/* =============================================
   Part 9: Footer
   ============================================= */

.footer {
    background-color: var(--color-dark);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-dark-lightest);
}

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

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.footer-logo img {
    height: 32px;
    width: auto;
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark-lighter);
    border-radius: var(--border-radius-md);
    color: var(--color-gray-400);
    transition: all var(--transition-base);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: var(--color-dark);
}

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

.footer-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

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

.footer-menu a {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-dark-lightest);
    text-align: center;
}

.copyright {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-bottom: 0;
}

/* Footer Responsive */
@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (min-width: 1024px) {
    .footer {
        padding: var(--spacing-4xl) 0 var(--spacing-xl);
    }
}

/* =============================================
   Animations & Scroll Effects
   ============================================= */

/* Fade in animation for elements */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animations */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }

/* Reduced motion preference */
@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;
    }
}