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

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --accent: #3b82f6;
    --text-dark: #1e293b;
    --text-medium: #475569;
    --text-light: #64748b;
    --bg-white: #ffffff;
    --bg-gray: #f1f5f9;
    --bg-blue: #eff6ff;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Layout Utilities */
.container {
    margin: 0 auto;
    padding: 0 2rem;
}

.container-sm {
    max-width: 700px;
}

.container-md {
    max-width: 800px;
}

.container-lg {
    max-width: 1000px;
}

.container-xl {
    max-width: 1200px;
}

.section {
    padding: 5rem 2rem;
}

.section-sm {
    padding: 3rem 2rem;
}

/* Background Utilities */
.bg-white {
    background: var(--bg-white);
}

.bg-gray {
    background: var(--bg-gray);
}

.bg-blue {
    background: var(--bg-blue);
}

/* Text Utilities */
.text-center {
    text-align: center;
}

.text-medium {
    color: var(--text-medium);
}

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

.text-white {
    color: white;
}

/* Text Transform */
.uppercase {
    text-transform: uppercase;
}

.tracking-wide {
    letter-spacing: 0.05em;
}

/* Font Sizes */
.text-xs {
    font-size: 0.75rem;
}

.text-sm {
    font-size: 0.875rem;
}

.text-base {
    font-size: 0.95rem;
}

.text-lg {
    font-size: 1.05rem;
}

.text-xl {
    font-size: 1.25rem;
}

.text-2xl {
    font-size: 1.35rem;
}

.text-3xl {
    font-size: 1.75rem;
}

.text-4xl {
    font-size: 2.25rem;
}

/* Font Weights */
.font-medium {
    font-weight: 500;
}

.font-semibold {
    font-weight: 600;
}

.font-bold {
    font-weight: 700;
}

/* Line Heights */
.leading-tight {
    line-height: 1.2;
}

.leading-normal {
    line-height: 1.6;
}

.leading-relaxed {
    line-height: 1.8;
}

/* Typography Components */
.title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.intro {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 3rem;
}

/* Width & Height */
.w-full {
    width: 100%;
}

.h-10 {
    height: 40px;
}

.h-12 {
    height: 45px;
}

.h-15 {
    height: 60px;
}

.h-30 {
    height: 120px;
}

.w-30 {
    width: 120px;
}

.max-w-md {
    max-width: 700px;
}

.max-w-lg {
    max-width: 900px;
}

/* Positioning */
.sticky {
    position: sticky;
}

.top-0 {
    top: 0;
}

.z-100 {
    z-index: 100;
}

/* Opacity */
.opacity-80 {
    opacity: 0.8;
}

.opacity-95 {
    opacity: 0.95;
}

/* Display */
.inline-block {
    display: inline-block;
}

/* Margin Auto */
.mx-auto {
    margin: 0 auto;
}

/* Flex Utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-wrap {
    flex-wrap: wrap;
}

.justify-between {
    justify-content: space-between;
}

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

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

.gap-sm {
    gap: 1rem;
}

.gap-md {
    gap: 2rem;
}

.gap-lg {
    gap: 4rem;
}

/* Grid Utilities */
.grid {
    display: grid;
}

.grid-2 {
    grid-template-columns: 1fr 1fr;
}

.grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid-auto-fill {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

/* Spacing Utilities */
.mb-1 {
    margin-bottom: 0.75rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

.mb-6 {
    margin-bottom: 3rem;
}

/* Border & Shadow Utilities */
.rounded {
    border-radius: 6px;
}

.rounded-lg {
    border-radius: 12px;
}

.rounded-full {
    border-radius: 50%;
}

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

.shadow-md {
    box-shadow: var(--shadow-md);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.border {
    border: 1px solid var(--border);
}

/* Component: Card */
.card {
    background: var(--bg-gray);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Component: Button */
.btn {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

.btn:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-lg {
    padding: 1rem 2rem;
    font-weight: 600;
}

/* Component: Input */
.input {
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
}

.input:focus {
    outline: none;
    border-color: var(--accent);
}

/* Component: Link */
.link {
    color: var(--accent);
    text-decoration: none;
}

.link:hover {
    text-decoration: underline;
}

/* Navigation */
nav {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    padding: 4rem 2rem;
}

/* About */
.about-container.centered {
    grid-template-columns: 1fr;
}

/* Contact */
.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

/* Messages */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: 1rem;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 1rem;
}

/* Footer */
footer {
    background: var(--primary-dark);
    padding: 2.5rem 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 1rem;
    }

    .section-sm {
        padding: 2rem 1rem;
    }

    .logo img {
        height: 32px;
    }

    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1.125rem;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .gap-lg {
        gap: 2rem;
    }

    .gap-md {
        gap: 1.5rem;
    }

    .title {
        font-size: 1.75rem;
    }

    .about-content h2 {
        font-size: 2rem;
    }

    .grid-auto-fit,
    .grid-auto-fill {
        grid-template-columns: 1fr;
    }
}