:root {
    --color-primary: #062b5f;
    --color-primary-dark: #031b3d;
    --color-primary-light: #eaf4ff;
    --color-secondary: #1f78d1;
    --color-accent: #d9a441;
    --color-accent-light: #f8e7b7;
    --color-text: #102033;
    --color-muted: #65758b;
    --color-border: #dce6f2;
    --color-bg: #f6fafd;
    --color-white: #ffffff;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;

    --shadow-soft: 0 10px 30px rgba(6, 43, 95, 0.08);
    --shadow-card: 0 18px 45px rgba(6, 43, 95, 0.12);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", Tahoma, sans-serif;
    color: var(--color-text);
    background:
        radial-gradient(circle at 10% 10%, rgba(31, 120, 209, 0.08), transparent 35%),
        radial-gradient(circle at 88% 4%, rgba(217, 164, 65, 0.12), transparent 30%),
        var(--color-bg);
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1180px, calc(100% - 32px));
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: #000000;
    border-bottom: 1px solid transparent;
    backdrop-filter: none;
    transition: background-color 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
}

@supports (animation-timeline: scroll()) {
    .site-header {
        animation: header-solid linear both;
        animation-timeline: scroll(root block);
        animation-range: 0 120px;
    }

    @keyframes header-solid {
        from {
            background: #000000;
            border-color: transparent;
            backdrop-filter: none;
        }

        to {
            background: #000000;
            border-color: rgba(255, 255, 255, 0.16);
            backdrop-filter: blur(6px);
        }
    }
}

.header-inner {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    font-weight: 800;
    font-size: 1.02rem;
    letter-spacing: 0.02em;
    color: var(--color-primary-dark);
}

.brand img {
    display: block;
    width: auto;
    height: clamp(52px, 6vw, 72px);
    max-width: 320px;
    object-fit: contain;
}

.main-nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
    gap: 24px;
}

.main-nav a {
    color: rgba(255, 255, 255, 0.86);
    font-weight: 500;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
    color: #ffffff;
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.26);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    background: linear-gradient(120deg, var(--color-primary), #0a3e82 82%);
    color: var(--color-white);
    font-weight: 700;
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-soft);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 16px 36px rgba(6, 43, 95, 0.22);
}

.btn-sm {
    min-height: 42px;
    padding-inline: 18px;
    border-radius: var(--radius-sm);
}

.btn-ghost {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-border);
    box-shadow: none;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
    box-shadow: none;
}

.hero {
    padding: 130px 0 72px;
    position: relative;
    background:
        linear-gradient(100deg, rgba(3, 27, 61, 0.72) 0%, rgba(3, 27, 61, 0.48) 46%, rgba(3, 27, 61, 0.3) 100%),
        url("../img/airplane-hero.png") center/cover no-repeat;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 520px;
    align-items: center;
}

.hero-copy {
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    max-width: 720px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.eyebrow {
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.77rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.hero h1 {
    margin: 0;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    font-size: clamp(2rem, 4.4vw, 3.8rem);
    line-height: 1.05;
    color: #ffffff;
}

.lead {
    margin: 16px 0 22px;
    color: rgba(255, 255, 255, 0.92);
    max-width: 56ch;
}

.quick-facts {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.quick-facts li {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.35);
    color: #ffffff;
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.hero-visual {
    display: none;
}

.hero-visual::after {
    content: none;
}

.hero-visual img {
    display: none;
}

.hero .btn-ghost {
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.55);
}

.hero .btn-ghost:hover,
.hero .btn-ghost:focus-visible {
    color: #ffffff;
    border-color: #ffffff;
}

.activities {
    padding: 10px 0 52px;
}

.activities-card {
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    padding: 30px 0;
}

.activities-card h2 {
    margin: 0 0 10px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    color: var(--color-primary-dark);
    text-align: center;
}

.activities-intro {
    margin: 0 auto 24px;
    max-width: 70ch;
    text-align: center;
    color: var(--color-muted);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.activity-item {
    background: linear-gradient(180deg, #ffffff 0%, #f6faff 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 14px;
    transition: box-shadow 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}

.activity-item:hover,
.activity-item:focus-within {
    box-shadow: var(--shadow-soft);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.activity-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.activity-icon {
    display: inline-grid;
    place-content: center;
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 800;
}

.activity-item h3 {
    margin: 0;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    font-size: 0.95rem;
    line-height: 1.2;
}

.activity-item p {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.86rem;
}

.about {
    padding: 10px 0 62px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center;
}

.about-copy {
    padding-block: 20px;
}

.about-copy h2 {
    margin-top: 0;
    margin-bottom: 16px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    color: var(--color-primary-dark);
}

.about-copy p {
    margin-top: 0;
    margin-bottom: 14px;
    color: var(--color-muted);
}

.about-image-fade {
    margin: 0;
    min-height: 0;
}

.about-image-fade img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
}

.about-visual-wrap {
    display: grid;
    gap: 16px;
}

.about-visual {
    margin: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-height: 270px;
    box-shadow: var(--shadow-soft);
}

.about-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.event-card {
    background: linear-gradient(170deg, var(--color-primary-dark), var(--color-primary));
    color: var(--color-white);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-soft);
}

.event-card h3 {
    margin: 0 0 12px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
}

.event-card ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 8px;
}

.event-card strong {
    color: var(--color-accent-light);
}

.registration {
    padding: 8px 0 64px;
}

.form-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 34px;
}

.form-header h1,
.form-header h2 {
    margin: 0 0 8px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    color: var(--color-primary-dark);
}

.section-title {
    margin: 0 0 8px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    color: var(--color-primary-dark);
    font-size: 1.08rem;
}

.form-header p {
    margin: 0;
    color: var(--color-muted);
}

.steps {
    margin: 24px 0 20px;
    padding: 0;
    list-style: none;
    display: flex;
    gap: 10px;
    overflow-x: auto;
}

.steps li {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    padding: 8px 14px;
    background: #f8fbff;
    color: var(--color-muted);
    font-weight: 600;
    font-size: 0.9rem;
}

.steps li span {
    width: 24px;
    height: 24px;
    border-radius: 999px;
    display: inline-grid;
    place-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 800;
}

.steps li.is-active {
    border-color: rgba(31, 120, 209, 0.55);
    background: #edf6ff;
    color: var(--color-primary-dark);
}

.steps li.is-active span {
    background: var(--color-secondary);
    color: var(--color-white);
}

.step-block {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 18px;
    margin: 0 0 16px;
    background: #fbfdff;
}

.active-step {
    border-color: rgba(31, 120, 209, 0.45);
    background: linear-gradient(180deg, #fafdff 0%, #f2f8ff 100%);
}

.step-block.hidden-step {
    display: none;
}

.step-block[data-step-block="2"]:not(.hidden-step) {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-block[data-step-block="3"]:not(.hidden-step) {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-actions {
    margin-top: 14px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.step-block legend {
    padding: 0 8px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    color: var(--color-primary-dark);
    font-weight: 700;
}

.form-grid {
    display: grid;
    gap: 14px;
    align-items: start;
}

.cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.field {
    display: grid;
    gap: 6px;
}

.field label,
.field-label {
    color: var(--color-primary-dark);
    font-size: 0.94rem;
    font-weight: 600;
    margin: 0;
}

.field-check {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    color: var(--color-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.field-check input[type="checkbox"] {
    width: 16px;
    height: 16px;
    min-height: 16px;
    margin: 0;
    accent-color: var(--color-secondary);
}

input,
select,
textarea {
    width: 100%;
    min-height: 46px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0 14px;
    font: inherit;
    color: var(--color-text);
    background: var(--color-white);
}

textarea {
    padding-block: 10px;
    min-height: 100px;
}

input:focus,
select:focus,
textarea:focus {
    outline: 3px solid rgba(31, 120, 209, 0.18);
    border-color: var(--color-secondary);
}

.choice-grid {
    display: grid;
    gap: 8px;
    margin-top: 2px;
}

.choice-grid label {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 42px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0 12px;
    color: var(--color-text);
    background: var(--color-white);
}

.choice-grid input[type="radio"],
.choice-grid input[type="checkbox"] {
    width: 16px;
    height: 16px;
    min-height: 16px;
    margin: 0;
    accent-color: var(--color-secondary);
}

.choice-grid.compact label {
    justify-content: flex-start;
}

.conditional-block {
    margin-top: 10px;
    border: 1px dashed rgba(31, 120, 209, 0.5);
    border-radius: var(--radius-md);
    padding: 14px;
    background: rgba(31, 120, 209, 0.03);
}

.conditional-title {
    margin: 0 0 10px;
    color: var(--color-secondary);
    font-weight: 700;
    font-size: 0.9rem;
}

.confirm-box {
    margin-bottom: 14px;
    border: 1px solid var(--color-border);
    background: #fffdf7;
    border-radius: var(--radius-md);
    padding: 16px;
}

.confirm-box p {
    margin: 0 0 6px;
}

.confirm-box p:last-child {
    margin-bottom: 0;
    color: var(--color-muted);
}

.btn-full {
    width: 100%;
}

.final-cta {
    padding: 10px 0 58px;
}

.final-cta-inner {
    border-radius: var(--radius-lg);
    padding: 38px 30px;
    background:
        linear-gradient(120deg, rgba(217, 164, 65, 0.2), rgba(217, 164, 65, 0) 35%),
        linear-gradient(135deg, var(--color-primary-dark), #0b3f86 78%);
    color: var(--color-white);
    text-align: center;
    box-shadow: var(--shadow-card);
}

.final-cta-inner h2 {
    margin: 0;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.final-cta-inner p {
    margin: 10px auto 22px;
    max-width: 62ch;
    color: rgba(255, 255, 255, 0.88);
}

.btn-accent {
    background: linear-gradient(135deg, var(--color-accent), #f0bd60);
    color: var(--color-primary-dark);
    box-shadow: 0 16px 36px rgba(3, 27, 61, 0.26);
}

.site-footer {
    border-top: 1px solid var(--color-border);
    background: #f4f8fc;
    padding: 36px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

.site-footer h3 {
    margin: 0 0 10px;
    font-family: "Montserrat", "Trebuchet MS", sans-serif;
    color: var(--color-primary-dark);
    font-size: 1rem;
}

.site-footer p,
.site-footer li {
    color: var(--color-muted);
    margin: 0 0 8px;
    font-size: 0.94rem;
}

.site-footer ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

@media (max-width: 1024px) {

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

    .about-copy {
        padding-block: 4px;
    }

    .hero-visual {
        display: none;
    }

    .activities-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .cols-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .header-inner {
        min-height: 72px;
    }

    .main-nav {
        display: none;
    }

    .hero {
        padding-top: 110px;
        padding-bottom: 54px;
    }

    .hero-copy {
        padding: 0;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .activities-grid,
    .cols-2,
    .cols-4 {
        grid-template-columns: 1fr 1fr;
    }

    .form-card {
        padding: 24px;
    }

    .registration .steps {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        width: min(1180px, calc(100% - 22px));
    }

    .btn,
    .btn-sm {
        width: 100%;
    }

    .header-inner {
        gap: 12px;
    }

    .brand {
        font-size: 0.95rem;
    }

    .brand img {
        height: 50px;
        max-width: 220px;
    }

    .hero-copy {
        padding: 0;
    }

    .activities-card {
        padding: 20px;
    }

    .activities-grid,
    .cols-3,
    .cols-2,
    .cols-4,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .step-block {
        padding: 14px;
    }

    .final-cta-inner {
        padding: 28px 20px;
        text-align: left;
    }
}