/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #2c3e50;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background: #ffffff;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* Header */
.header {
    text-align: center;
    padding: 50px 20px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #ffffff;
    border-radius: 12px;
    margin-bottom: 40px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.logo-link {
    display: inline-block;
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
    margin-bottom: 20px;
    transition: transform 0.2s ease;
}

.logo-link:hover {
    transform: scale(1.05);
}

.header h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 18px;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Content */
.content {
    padding: 0 20px 40px;
}

section {
    margin-bottom: 50px;
}

section:last-child {
    margin-bottom: 0;
}

h2 {
    font-size: 28px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 30px;
    text-align: center;
    position: relative;
    padding-bottom: 15px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

h3 {
    font-size: 22px;
    font-weight: 600;
    color: #34495e;
    margin-bottom: 15px;
}

p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.lead {
    font-size: 20px;
    font-weight: 500;
    color: #2c3e50;
    margin-bottom: 20px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4f8 100%);
    padding: 40px;
    border-radius: 12px;
    margin-bottom: 40px;
    border-left: 5px solid #667eea;
}

.hero-content p {
    font-size: 17px;
    color: #2c3e50;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.feature-card {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid #667eea;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    text-align: center;
}

.feature-list {
    list-style: none;
    padding-left: 0;
    margin-top: 15px;
}

.feature-list li {
    padding: 8px 0 8px 25px;
    position: relative;
    color: #555;
}

.feature-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: 700;
}

.highlight {
    background: #fff3cd;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #ffc107;
    margin-top: 15px;
    font-weight: 500;
}

/* Timeline */
.timeline {
    margin-bottom: 50px;
}

.timeline-item {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 5px solid #667eea;
    transition: background 0.3s ease;
}

.timeline-item:hover {
    background: #f0f7ff;
}

.timeline-year {
    font-size: 20px;
    font-weight: 700;
    color: #667eea;
    min-width: 120px;
    flex-shrink: 0;
}

.timeline-content h3 {
    margin-bottom: 8px;
    color: #2c3e50;
}

.timeline-content p {
    color: #6c757d;
    margin: 0;
}

/* Principles Grid */
.principles {
    margin-bottom: 50px;
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.principle-item {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 12px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.principle-item:hover {
    transform: translateY(-5px);
}

.principle-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.principle-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #2c3e50;
}

.principle-item p {
    font-size: 14px;
    color: #6c757d;
    margin: 0;
}

/* Advantages */
.advantages {
    margin-bottom: 50px;
}

.advantages-list {
    display: grid;
    gap: 20px;
    margin-top: 30px;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    border-left: 4px solid #28a745;
    transition: transform 0.2s ease;
}

.advantage-item:hover {
    transform: translateX(5px);
}

.check-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: #28a745;
    color: #ffffff;
    border-radius: 50%;
    font-weight: 700;
    font-size: 18px;
    flex-shrink: 0;
}

.advantage-item p {
    margin: 0;
    font-size: 16px;
    color: #2c3e50;
}

/* Future Section */
.future {
    background: linear-gradient(135deg, #e8f4f8 0%, #f0f7ff 100%);
    padding: 40px;
    border-radius: 12px;
    margin-bottom: 40px;
    text-align: center;
}

.future p {
    font-size: 18px;
    color: #2c3e50;
    max-width: 800px;
    margin: 0 auto;
}

/* Contact Info */
.contact-info {
    margin-bottom: 40px;
}

.contact-card {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    text-align: center;
    border-top: 4px solid #667eea;
}

.contact-card p {
    margin-bottom: 10px;
    font-size: 16px;
}

.contact-card a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.contact-card a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Links */
a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #764ba2;
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 20px;
    border-top: 2px solid #e9ecef;
    margin-top: 50px;
}

.back-link {
    display: inline-block;
    font-size: 16px;
    font-weight: 500;
    color: #667eea;
    padding: 14px 28px;
    border: 2px solid #667eea;
    border-radius: 8px;
    transition: all 0.3s ease;
    background: #ffffff;
}

.back-link:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #ffffff;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* Mobile Optimization */
@media (max-width: 768px) {
    .container {
        padding: 15px;
        margin: 0;
        box-shadow: none;
    }

    .header {
        padding: 40px 20px 30px;
        border-radius: 0;
        margin: -20px -15px 30px -15px;
    }

    .header h1 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 16px;
    }

    .content {
        padding: 0 10px 30px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .hero {
        padding: 25px;
    }

    .timeline-item {
        flex-direction: column;
        gap: 15px;
    }

    .timeline-year {
        min-width: auto;
    }

    .principles-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 20px;
    }

    .advantage-item {
        padding: 20px;
    }

    .future {
        padding: 30px 20px;
    }

    .contact-card {
        padding: 25px 20px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 15px;
    }

    .header h1 {
        font-size: 26px;
    }

    .logo-link {
        font-size: 22px;
    }

    .subtitle {
        font-size: 15px;
    }

    h2 {
        font-size: 22px;
    }

    h3 {
        font-size: 18px;
    }

    .lead {
        font-size: 18px;
    }

    .feature-card,
    .contact-card {
        padding: 20px;
    }

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

/* Print Styles */
@media print {
    body {
        background: #ffffff;
    }

    .container {
        box-shadow: none;
        max-width: 100%;
    }

    .header {
        background: #667eea;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .footer {
        display: none;
    }

    .feature-card,
    .principle-item,
    .advantage-item {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}