:root {
    --primary-color: #00e5ff;
    /* Vibrant Cyan */
    --secondary-color: #2979ff;
    /* Bright Blue */
    --bg-color: #121212;
    /* Dark Background */
    --surface-color: #1e1e1e;
    /* Slightly lighter for cards/sections */
    --text-color: #ffffff;
    --text-muted: #b0b0b0;
    --font-main: 'Outfit', sans-serif;
    --spacing-unit: 1rem;
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --banner-height: 40px;
}

.promo-banner {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: #000;
    text-align: center;
    padding: 0.5rem 0;
    font-weight: 700;
    font-size: 0.9rem;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1001;
    height: var(--banner-height);
    display: flex;
    align-items: center;
    justify-content: center;
    text-transform: uppercase;
    letter-spacing: 1px;
}

body.has-banner header {
    top: var(--banner-height);
}

body.has-banner main {
    padding-top: var(--banner-height);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* Header */
header {
    background-color: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    font-size: 1.1rem;
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1571019614242-c5c5dee9f50b?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
    /* Placeholder image */
    background-size: cover;
    background-position: center;
    padding-top: 80px;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-content h1 span {
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--primary-color);
    color: #000;
    font-weight: 700;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--primary-color);
    cursor: pointer;
    text-align: center;
}

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

/* Sections */
section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.section-title span {
    border-bottom: 3px solid var(--primary-color);
}

/* Services Preview */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

/* About Preview */
.about-preview {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.about-image {
    flex: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

/* Footer */
footer {
    background-color: var(--surface-color);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-info h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-info p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hamburger {
        display: block;
        z-index: 1001;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--surface-color);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: var(--transition);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.5);
    }

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

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .about-preview {
        flex-direction: column;
    }
}

/* Loading Spinner */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* Form & Utility Classes */
.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.vh-100 {
    min-height: 100vh;
}

.card {
    background-color: var(--surface-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.82);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
}

.form-grid-group {
    display: grid;
    grid-template-columns: 120px 1fr;
    align-items: center;
    gap: 1rem;
}

@media (max-width: 480px) {
    .form-grid-group {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }
}

.form-label {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    background-color: var(--bg-color);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--font-main);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 229, 255, 0.1);
}

.btn-block {
    width: 100%;
}

.btn-google {
    background-color: #DB4437;
    border-color: #DB4437;
    color: #fff;
    font-size: 0.9rem;
    padding: 0.8rem 1rem;
}

.btn-google:hover {
    background-color: transparent;
    color: #DB4437;
}

.auth-links {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-muted);
}

.auth-links a {
    color: var(--primary-color);
    font-weight: 600;
}