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

:root {
    --red: #e74c3c;
    --red-dark: #c0392b;
    --blue: #0258B4;
    --green: #22c55e;
    --yellow: #facc15;
    --orange: #f97316;
    --dark: #1e3a5f;
    --dark-2: #234b7a;
    --gray-bg: #f0f7ff;
    --white: #ffffff;
    --text: #2d3748;
    --text-light: #64748b;
    --radius: 20px;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Header ── */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo img {
    height: 42px;
}

nav {
    display: flex;
    gap: 32px;
}

nav a {
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: -0.01em;
    transition: color 0.2s;
}

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

/* ── Hero ── */
.hero {
    position: relative;
    margin-top: 72px;
    padding: 100px 0 110px;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #0ea5e9 100%);
    color: var(--white);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 0%, rgba(250,204,21,0.2) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 100%, rgba(34,197,94,0.15) 0%, transparent 50%),
        radial-gradient(circle at 90% 20%, rgba(249,115,22,0.12) 0%, transparent 40%);
}

.hero-inner {
    position: relative;
}

.hero-badge {
    display: inline-block;
    background: rgba(250,204,21,0.2);
    border: 1px solid rgba(250,204,21,0.5);
    color: #fde047;
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.03em;
    padding: 6px 20px;
    border-radius: 100px;
    margin-bottom: 28px;
    text-transform: uppercase;
}

.hero-rt-logo {
    display: block;
    height: 80px;
    margin: 0 auto 28px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    max-width: 600px;
    margin: 0 auto 36px;
}

.hero h1 span {
    background: linear-gradient(135deg, #facc15, #fb923c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.75);
    max-width: 520px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    font-size: 1.05rem;
    max-width: 540px;
    margin: -28px auto 48px;
    line-height: 1.7;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border: none;
    border-radius: 100px;
    font-size: 0.95rem;
    font-weight: 700;
    font-family: inherit;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-hero {
    background: linear-gradient(135deg, #facc15, #f97316);
    color: #1e3a5f;
    font-weight: 800;
    box-shadow: 0 4px 24px rgba(249,115,22,0.35);
}

.btn-hero:hover {
    background: linear-gradient(135deg, #fde047, #fb923c);
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(249,115,22,0.45);
}

/* ── Categories ── */
.categories {
    padding: 90px 0;
    background: var(--white);
}

.categories h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--dark);
    margin-bottom: 48px;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.cat-card {
    background: var(--gray-bg);
    border: 2px solid transparent;
    border-radius: var(--radius);
    padding: 32px 16px;
    text-align: center;
    cursor: default;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.cat-card:hover {
    border-color: #93c5fd;
}

.cat-card.active {
    background: linear-gradient(135deg, #2563eb, #0ea5e9);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(37,99,235,0.25);
}

.cat-img {
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 14px;
}

.cat-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.cat-card:hover .cat-img img,
.cat-card.active .cat-img img {
    transform: scale(1.05);
}

.cat-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

/* ── Catalog ── */
.catalog {
    padding: 90px 0;
    background: var(--white);
}

.catalog-inner {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 50%, #15803d 100%);
    border-radius: 24px;
    padding: 64px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.catalog-inner::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(250,204,21,0.2), transparent 70%);
    border-radius: 50%;
}

.catalog-content {
    position: relative;
}

.catalog h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.catalog p {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.6);
    max-width: 480px;
    margin: 0 auto 32px;
}

.catalog .btn {
    background: var(--white);
    color: #15803d;
    font-weight: 800;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.catalog .btn:hover {
    background: #f0fdf4;
    transform: translateY(-2px);
}

/* ── Contact ── */
.contact {
    padding: 90px 0;
    background: var(--gray-bg);
    position: relative;
}

.contact h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--dark);
    margin-bottom: 6px;
}

.contact-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 48px;
    font-size: 1.05rem;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 700px;
    margin: 0 auto;
}

.contact-card {
    background: var(--white);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: var(--radius);
    padding: 32px;
    transition: box-shadow 0.3s, transform 0.3s;
}

.contact-card:hover {
    box-shadow: 0 12px 32px rgba(0,0,0,0.08);
    transform: translateY(-4px);
}

.contact-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2563eb, #0ea5e9);
    color: var(--white);
    font-weight: 800;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.contact-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 2px;
}

.contact-card .role {
    color: var(--red);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 16px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 6px 0;
    transition: color 0.2s;
}

.contact-link:hover {
    color: var(--blue);
}

.contact-link svg {
    flex-shrink: 0;
    color: var(--text-light);
}

/* ── Footer ── */
footer {
    background: linear-gradient(135deg, #1e3a5f, #2563eb);
    color: rgba(255,255,255,0.7);
    text-align: center;
    padding: 28px 0;
    font-size: 0.85rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero { padding: 70px 0 80px; }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-cards { grid-template-columns: 1fr; }
    .catalog-inner { padding: 48px 28px; }
    nav { display: none; }
}

@media (max-width: 480px) {
    .category-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .cat-card { padding: 24px 12px; }
    .cat-img { aspect-ratio: 4/3; }
    nav { gap: 14px; }
}