:root {
    --primary: #00A9E9;
    --primary-dark: #0088c4;
    --secondary: #1a1a2e;
    --accent: #f5f5f5;
    --text-dark: #222;
    --text-light: #666;
    --white: #ffffff;
    --shadow: 0 8px 30px rgba(0,0,0,0.12);
    --border-radius: 12px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--accent);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Header */
.header {
    background: var(--white);
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0 20px;
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    flex-wrap: wrap;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-area img {
    height: 50px;
    width: auto;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--secondary);
    letter-spacing: -1px;
}

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

.slogan {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 400;
    letter-spacing: 0.5px;
}

.nav-toggle {
    display: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--secondary);
    background: none;
    border: none;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 5px;
    flex-wrap: wrap;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.85rem;
    padding: 8px 14px;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.nav-menu a:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-subscribe {
    background: var(--primary);
    color: var(--white) !important;
    padding: 10px 24px !important;
    border-radius: 30px !important;
    font-weight: 700 !important;
}

.btn-subscribe:hover {
    background: var(--primary-dark) !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,169,233,0.3);
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--secondary) 0%, #16213e 100%);
    color: var(--white);
    padding: 80px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,169,233,0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

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

.hero p {
    font-size: 1.3rem;
    opacity: 0.9;
    margin-bottom: 30px;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    padding: 14px 36px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,169,233,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    padding: 14px 36px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    border: 2px solid var(--white);
    transition: all 0.3s ease;
}

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

/* Sections */
.section {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 20px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 4px;
}

.section-subtitle {
    color: var(--text-light);
    margin-top: 15px;
    margin-bottom: 40px;
    font-size: 1.1rem;
}

/* Grids */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.card-img {
    height: 200px;
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    align-items: flex-start;
    padding: 15px;
}

.card-tag {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
}

.card-body {
    padding: 25px;
}

.card-body h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.card-body p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #f0f0f0;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* PDF Grid */
.pdf-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.pdf-item {
    background: var(--white);
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.pdf-item:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.pdf-item i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.pdf-item a {
    display: block;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 600;
    margin-top: 8px;
    font-size: 0.9rem;
}

.pdf-item .pdf-date {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Contact */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 30px;
    background: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.contact-info div {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-info i {
    font-size: 2rem;
    color: var(--primary);
    width: 50px;
    text-align: center;
}

/* Footer */
.footer {
    background: var(--secondary);
    color: rgba(255,255,255,0.7);
    padding: 40px 20px;
    text-align: center;
    border-top: 3px solid var(--primary);
}

.footer a {
    color: var(--white);
    text-decoration: none;
}

.footer .social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
}

.footer .social a {
    font-size: 1.8rem;
    transition: all 0.3s ease;
}

.footer .social a:hover {
    color: var(--primary);
    transform: translateY(-3px);
}

/* Responsive */
@media (max-width: 1024px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding: 20px 0;
        gap: 5px;
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-menu a {
        padding: 12px 20px;
        border-radius: 8px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .contact-info {
        padding: 20px;
    }

    .contact-info div {
        flex-direction: column;
        text-align: center;
    }
}