/* Core Styling & Variables */
:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --text-main: #1e293b;
    --text-muted: #475569;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Navigation */
.navbar {
    background: #ffffff;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

@media(min-width: 640px) {
    .nav-container {
        flex-direction: row;
    }
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary);
    letter-spacing: -0.05em;
}

.logo-dark {
    color: #0f172a;
}

.tabs-wrapper {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    background: none;
    border: none;
    padding: 8px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

/* Main layouts */
.main-content {
    flex-grow: 1;
    max-width: 1140px;
    margin: 0 auto;
    padding: 48px 16px;
    width: 100%;
}

.tab-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 48px;
}

.tab-header h1 {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 16px;
}

.tab-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* Grid & Cards */
.services-grid {
    display: grid;
    gap: 32px;
}

@media(min-width: 768px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.service-card {
    background: #ffffff;
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
}

.service-card .icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    font-weight: 700;
}

.service-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Contact Form UI */
.contact-box {
    display: block;
    margin: 0 auto;
    /* Form is perfectly center-aligned horizontally */
    max-width: 500px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.contact-box h2 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.form-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 24px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 12px;
    background-color: var(--bg-light);
    border: 1px solid #cbd5e1;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s, background-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    background-color: #ffffff;
}

.submit-btn {
    background-color: var(--primary);
    color: #ffffff;
    font-weight: 700;
    padding: 14px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.875rem;
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
    transition: background-color 0.2s;
}

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

/* Footer */
.footer {
    background-color: #020617;
    color: #94a3b8;
    padding: 32px 16px;
    text-align: center;
    font-size: 0.75rem;
    border-top: 1px solid #0f172a;
    margin-top: auto;
}