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

body {
    font-family: 'Sarabun', 'Kanit', 'Prompt', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    padding-top: 80px;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background: white;
    border-radius: 3px;
    transition: all 0.3s;
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

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

.nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav a:hover,
.nav a.active {
    background-color: rgba(255,255,255,0.2);
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.3rem;
    opacity: 0.95;
}

/* Steps Section */
.steps-section {
    padding: 5rem 0;
    background: white;
}

.steps-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.steps-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    position: sticky;
    top: 100px;
}

.steps-list h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #1e3c72;
}

.step-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    border-radius: 15px;
    border-left: 5px solid #667eea;
    transition: transform 0.3s, box-shadow 0.3s;
}

.step-item:hover {
    transform: translateX(10px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h3 {
    color: #1e3c72;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.step-content p {
    color: #666;
    line-height: 1.6;
}

/* Requirements Section */
.requirements-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

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

.requirement-card {
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.requirement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.requirement-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.requirement-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #1e3c72;
}

.requirement-card p {
    color: #666;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.requirement-card strong {
    color: #1e3c72;
    font-size: 1.1rem;
}

/* Security Section */
.security-section {
    padding: 5rem 0;
    background: white;
}

.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.security-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.security-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #1e3c72;
}

.security-text p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #555;
    line-height: 1.8;
}

.security-features {
    list-style: none;
}

.security-features li {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border-radius: 8px;
    border-left: 4px solid #4caf50;
    color: #2e7d32;
    font-size: 1.1rem;
}

/* Process Features */
.process-features {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

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

.feature-box {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.feature-box .feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-box h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #1e3c72;
}

.feature-box p {
    color: #666;
    line-height: 1.6;
}

/* CTA Section */
.cta {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, #00d4ff 0%, #00a8cc 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(0,212,255,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,212,255,0.6);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: #1e3c72;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #ccc;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding-top: 80px;
    }

    .header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
        flex-direction: column;
        padding: 2rem 0;
        gap: 0;
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        box-shadow: 0 4px 10px rgba(0,0,0,0.2);
        z-index: 999;
    }

    .nav.active {
        transform: translateX(0);
    }

    .nav a {
        display: block;
        padding: 1rem 2rem;
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav a:hover,
    .nav a.active {
        background-color: rgba(255,255,255,0.2);
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .steps-content {
        grid-template-columns: 1fr;
    }

    .steps-image img {
        position: static;
    }

    .security-content {
        grid-template-columns: 1fr;
    }

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

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