:root {
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --accent-color: #00d2d3;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    line-height: 1.6;
    color: var(--text-color);
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.logo .highlight {
    color: var(--primary-color);
}

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

.nav-links a {
    color: var(--secondary-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-login {
    margin-right: 1rem;
}

.btn-signup {
    background: var(--primary-color);
    color: var(--white) !important;
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    transition: background 0.3s;
}

.btn-signup:hover {
    background: #357abd;
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    color: #555;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    border: 2px solid var(--primary-color);
    margin-right: 1rem;
}

.btn-primary:hover {
    background: #357abd;
    border-color: #357abd;
}

.btn-outline {
    background: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-outline:hover {
    background: var(--secondary-color);
    color: var(--white);
}

/* Features */
.features {
    padding: 80px 0;
    background: var(--white);
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    border-radius: 10px;
    background: var(--light-bg);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

/* Security Banner */
.security-banner {
    background: var(--secondary-color);
    color: var(--white);
    text-align: center;
    padding: 60px 0;
}

.security-banner h2 {
    margin-bottom: 1rem;
}

.security-banner p {
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn-light {
    background: var(--white);
    color: var(--secondary-color);
    padding: 0.8rem 2rem;
    border-radius: 5px;
    font-weight: bold;
}

.btn-light:hover {
    background: #eee;
}

/* Footer */
.footer {
    background: #1a252f;
    color: #ecf0f1;
    padding: 60px 0 20px;
}

.footer .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer h3 {
    margin-bottom: 1.5rem;
    color: var(--white);
}

.footer a {
    display: block;
    margin-bottom: 0.5rem;
    color: #bdc3c7;
}

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

.social-icons a {
    display: inline-block;
    margin-right: 1rem;
    font-size: 1.2rem;
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid #34495e;
    padding-top: 20px;
    color: #7f8c8d;
}

/* Auth Pages (Login/Register) */
.auth-body {
    background: #f0f2f5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.auth-container {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-logo {
    font-size: 2rem;
    margin-bottom: 2rem;
    display: block;
    color: var(--secondary-color);
    font-weight: bold;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #666;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.btn-block {
    display: block;
    width: 100%;
    margin-top: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
}

.auth-footer {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: #666;
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

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