/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Theme Variables */
:root {
    /* Default Theme: Gray/Monochrome */
    --primary-color: #4b5563;
    --primary-dark: #374151;
    --secondary-color: #6b7280;
    --accent-color: #9ca3af;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-dark: #1f2937;
    --border-color: #d1d5db;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --hero-gradient-start: #4b5563;
    --hero-gradient-end: #1f2937;
    --highlight-color: #d1d5db;
}

/* Purple Theme */
[data-theme="purple"] {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #a78bfa;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --hero-gradient-start: #667eea;
    --hero-gradient-end: #764ba2;
    --highlight-color: #fbbf24;
}

/* Blue Theme */
[data-theme="blue"] {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #60a5fa;
    --accent-color: #93c5fd;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --border-color: #e2e8f0;
    --hero-gradient-start: #3b82f6;
    --hero-gradient-end: #1e40af;
    --highlight-color: #fbbf24;
}

/* Green Theme */
[data-theme="green"] {
    --primary-color: #10b981;
    --primary-dark: #059669;
    --secondary-color: #34d399;
    --accent-color: #6ee7b7;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f0fdf4;
    --bg-dark: #064e3b;
    --border-color: #d1fae5;
    --hero-gradient-start: #10b981;
    --hero-gradient-end: #047857;
    --highlight-color: #fbbf24;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-dark: #6366f1;
    --secondary-color: #a78bfa;
    --accent-color: #c4b5fd;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-dark: #030712;
    --border-color: #374151;
    --hero-gradient-start: #4338ca;
    --hero-gradient-end: #1e1b4b;
    --highlight-color: #fbbf24;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--hero-gradient-start) 0%, var(--hero-gradient-end) 100%);
    color: white;
    padding-top: 80px;
}

.hero-content {
    text-align: center;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    color: var(--highlight-color);
    position: relative;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2rem;
    opacity: 0.95;
    line-height: 1.8;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* Services Section */
.services {
    padding: 6rem 0;
    background-color: var(--bg-secondary);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background-color: var(--bg-primary);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.service-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

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

.service-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.service-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Contact Section */
.contact {
    padding: 6rem 0;
    background-color: var(--bg-primary);
    text-align: center;
}

.contact-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.contact-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background-color: var(--bg-dark);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.contact-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background-color: #1f2937;
}

.contact-button .icon {
    width: 24px;
    height: 24px;
}

/* Footer */
.footer {
    background-color: var(--bg-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer p {
    opacity: 0.8;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

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

    .section-title {
        font-size: 2rem;
    }

    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .nav-links {
        gap: 0.75rem;
        font-size: 0.9rem;
    }

    .service-card {
        padding: 1.5rem;
    }
}

/* Theme Switcher Styles */
.theme-switcher {
    position: relative;
}

.theme-toggle-btn {
    background-color: transparent;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.25rem;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
    background-color: var(--bg-secondary);
}

.theme-menu {
    position: absolute;
    top: calc(100% + 1rem);
    right: 0;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    display: none;
    min-width: 200px;
}

.theme-menu.active {
    display: block;
    animation: slideUp 0.3s ease;
}

.theme-menu h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.theme-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

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

.theme-option.active {
    border-color: var(--primary-color);
    background-color: var(--bg-secondary);
}

.theme-color {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-color.gray {
    background: linear-gradient(135deg, #4b5563 0%, #1f2937 100%);
}

.theme-color.purple {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.theme-color.blue {
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
}

.theme-color.green {
    background: linear-gradient(135deg, #10b981 0%, #047857 100%);
}

.theme-color.dark {
    background: linear-gradient(135deg, #4338ca 0%, #1e1b4b 100%);
}

.theme-name {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .nav-right {
        gap: 1rem;
    }

    .theme-toggle-btn {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .theme-menu {
        right: -1rem;
    }
}

@media (max-width: 480px) {
    .nav-right {
        gap: 0.5rem;
    }

    .theme-toggle-btn {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
}