/* Reset dan Variabel */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --white: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

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

/* Header */
header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.logo span {
    color: var(--secondary-color);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--secondary-color);
}

.auth-buttons {
    display: flex;
    gap: 10px;
}

.btn-login, .btn-register {
    padding: 8px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-login {
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
}

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

/* Hero Section */
.hero {
    padding: 120px 0 60px;
    background-color: var(--light-gray);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #666;
}

.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--secondary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.hero-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Features Section */
.features {
    padding: 60px 0;
    background-color: var(--white);
}

.features h2 {
    text-align: center;
    margin-bottom: 40px;
    color: var(--primary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 30px;
    background-color: var(--light-gray);
    border-radius: 10px;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

/* Calculator Section */
.calculator-section {
    padding: 60px 0;
    background-color: var(--light-gray);
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.input-group {
    position: relative;
}

.currency {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
}

.input-group input {
    padding-left: 30px;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.btn-secondary {
    padding: 12px 30px;
    background-color: var(--light-gray);
    color: var(--text-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s;
}

.btn-secondary:hover {
    background-color: #ddd;
}

.results {
    background-color: var(--light-gray);
    padding: 20px;
    border-radius: 5px;
}

.result-item {
    margin-bottom: 15px;
}

.result-item span {
    display: block;
    color: #666;
    font-size: 0.9rem;
}

.result-item p {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--primary-color);
}

.disclaimer {
    font-size: 0.8rem;
    color: #666;
    margin-top: 20px;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 40px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-section p {
    margin-bottom: 10px;
    opacity: 0.8;
}

.footer-section a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-section a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* About Section */
.about-section {
    padding: 120px 0 60px;
    background-color: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.about-text h2 {
    color: var(--primary-color);
    margin: 20px 0 10px;
}

.about-text p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Disclaimer & Privacy Section */
.disclaimer-section, .privacy-section {
    padding: 120px 0 60px;
    background-color: var(--white);
}

.disclaimer-content, .privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.disclaimer-content h2, .privacy-content h2 {
    color: var(--primary-color);
    margin: 30px 0 15px;
}

.disclaimer-content p, .privacy-content p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.disclaimer-content ul, .privacy-content ul {
    margin: 15px 0;
    padding-left: 20px;
}

.disclaimer-content li, .privacy-content li {
    margin-bottom: 10px;
}

/* Contact Section */
.contact-section {
    padding: 120px 0 60px;
    background-color: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.info-item {
    background-color: var(--light-gray);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.info-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.info-item h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.contact-form {
    background-color: var(--light-gray);
    padding: 30px;
    border-radius: 10px;
}

.contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    resize: vertical;
}

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .calculator-container {
        grid-template-columns: 1fr;
    }

    .hero-image {
        order: -1;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }

    .about-image {
        order: -1;
    }
}

@media (max-width: 480px) {
    .auth-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn-login, .btn-register {
        width: 100%;
        text-align: center;
    }

    .button-group {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
    }
}