:root { --primary: #7c3aed; --primary-dark: #5b21b6; --text: #211a35; --muted: #746b83; --background: #fafbfc; --border: #d9d2e3; }
* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--background); font: 14px/1.6 'Open Sans', sans-serif; }
button, input, select { font: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid #a855f7; outline-offset: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 100; background: white; color: var(--primary-dark); padding: 12px 20px; border-radius: 6px; }
.skip-link:focus { top: 12px; }
.conference-header { position: fixed; top: 0; left: 0; z-index: 40; width: 100%; color: white; transition: background-color .2s, box-shadow .2s; }
.conference-header.is-scrolled { background: rgba(26, 19, 46, .94); box-shadow: 0 2px 16px #160b2920; }
.header-container, .hero-container, .page-container, .footer-inner { width: 100%; max-width: 1140px; margin: 0 auto; padding-right: 15px; padding-left: 15px; }
.header-container { display: flex; justify-content: flex-end; align-items: center; min-height: 82px; }
.nav-list { display: flex; align-items: center; gap: 30px; list-style: none; margin: 0; padding: 0; }
.nav-list a { display: block; padding: 12px 0; color: white; font-size: 11px; font-weight: 700; line-height: 1.5; text-transform: uppercase; white-space: nowrap; transition: color .15s; }
.nav-list a:hover { color: #c795ff; text-decoration: none; }
.mobile-nav, .menu-toggle { display: none; }
.menu-toggle { position: relative; align-items: center; justify-content: center; width: 44px; height: 44px; padding: 0; border: 0; background: transparent; color: white; }
.burger, .burger::before, .burger::after { display: block; position: relative; width: 32px; height: 1px; background: currentColor; transition: transform .18s; }
.burger::before, .burger::after { content: ''; position: absolute; left: 0; }
.burger::before { top: -9px; }
.burger::after { top: 9px; }
.menu-toggle[aria-expanded="true"] .burger { background: transparent; }
.menu-toggle[aria-expanded="true"] .burger::before { top: 0; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .burger::after { top: 0; transform: rotate(-45deg); }
.conference-hero { position: relative; color: white; background: #201044; }
.hero-cover { position: relative; display: flex; align-items: center; min-height: 60vh; padding: 92px 0 80px; background: linear-gradient(hsla(221, 30%, 21%, .6), hsla(221, 30%, 21%, .6)), url('/registration-assets/banner-desktop.png') center center / cover no-repeat; }
.hero-container { position: relative; z-index: 1; }
.hero-title { max-width: 800px; margin: 0 0 52px; color: white; font-size: 33px; font-weight: 700; line-height: 1.3; text-transform: uppercase; }
.hero-date { margin: 0 0 8px; font-size: 30px; font-weight: 700; line-height: 1.3; }
.hero-location { margin: 0; font-size: 15px; font-weight: 500; line-height: 1.6; }
.hero-wave { position: relative; display: block; width: 100%; height: 140px; margin-top: -110px; pointer-events: none; }
.page-container { padding-top: 20px; padding-bottom: 76px; scroll-margin-top: 95px; }
.section-title { margin: 0 0 35px; padding: 0 0 31px; position: relative; color: var(--text); font-size: 35px; font-weight: 700; line-height: 1.3; text-transform: uppercase; }
.section-title::after { content: ''; position: absolute; left: 0; bottom: 0; width: 70px; height: 9px; background: var(--primary); }
.registration-form { margin: 0; }
.form-field { margin-bottom: 26px; }
.form-field label { display: block; margin-bottom: 10px; font-size: 15px; font-weight: 500; line-height: 1.6; }
.form-control { display: block; width: 100%; min-width: 0; height: 54px; margin: 0; padding: 13px 17px; color: var(--text); background: white; border: 1px solid var(--border); border-radius: 7px; box-shadow: 0 1px 2px #2f164508; font-size: 16px; line-height: 1.5; transition: border-color .15s, box-shadow .15s; }
.form-control:hover { border-color: #af95cf; }
.form-control:focus { border-color: var(--primary); outline: 0; box-shadow: 0 0 0 3px #7c3aed16; }
.select-wrap { position: relative; }
.select-wrap::after { content: ''; position: absolute; right: 20px; top: 21px; width: 9px; height: 9px; border-right: 2px solid #89729f; border-bottom: 2px solid #89729f; transform: rotate(45deg); pointer-events: none; }
select.form-control { appearance: none; padding-right: 48px; text-overflow: ellipsis; cursor: pointer; }
select.form-control:has(option[value=""]:checked) { color: #8a7e97; }
.registration-note { margin: 30px 0 34px; padding: 20px 24px; border-left: 3px solid var(--primary); border-radius: 0 6px 6px 0; background: #f1eafa; color: #5a4770; font-size: 14px; line-height: 1.9; }
.registration-note a { color: var(--primary-dark); text-decoration: underline; text-underline-offset: 3px; }
.participation { display: grid; gap: 20px; margin: 0 0 30px; padding: 0; border: 0; min-width: 0; }
.checkbox-label { display: flex; align-items: flex-start; gap: 13px; width: fit-content; max-width: 100%; cursor: pointer; font-size: 15px; line-height: 1.7; }
.checkbox-label input { appearance: none; display: grid; place-content: center; flex: 0 0 22px; width: 22px; height: 22px; margin: 2px 0 0; border: 1px solid #b9a6cf; border-radius: 4px; background: white; cursor: pointer; }
.checkbox-label input::before { content: ''; width: 10px; height: 6px; margin-top: -3px; border-left: 2px solid white; border-bottom: 2px solid white; transform: rotate(-45deg) scale(0); }
.checkbox-label input:checked { background: var(--primary); border-color: var(--primary); }
.checkbox-label input:checked::before { transform: rotate(-45deg) scale(1); }
.consent { border-top: 1px solid #e4deec; padding-top: 27px; }
.consent .checkbox-label { font-size: 14px; color: #6f627c; line-height: 1.9; }
.registration-button { display: inline-flex; align-items: center; justify-content: center; gap: 28px; min-width: 268px; min-height: 50px; margin-top: 30px; padding: 13px 28px; border: 1px solid var(--primary); border-radius: 25px; background: var(--primary); color: white; font-size: 15px; font-weight: 600; line-height: 1.5; text-transform: uppercase; transition: background-color .15s, box-shadow .15s; }
.registration-button:hover { background: var(--primary-dark); border-color: var(--primary-dark); box-shadow: 0 4px 15px #7c3aed24; }
.registration-button svg { width: 25px; height: 16px; }
.site-footer { color: #e6dbf5; background: var(--primary-dark); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px 32px; padding-top: 27px; padding-bottom: 27px; font-size: 12px; }
.footer-inner p { margin: 0; }
.footer-inner a { color: #e6dbf5; text-decoration: underline; text-underline-offset: 3px; }
@media (min-width: 992px) and (max-width: 1199px) {
    .header-container, .hero-container, .page-container, .footer-inner { max-width: 960px; }
    .nav-list { gap: 25px; }
    .hero-title { max-width: 750px; }
}
@media (max-width: 991px) {
    .conference-header, .conference-header.is-scrolled { background: var(--primary-dark); }
    .header-container { min-height: 70px; flex-wrap: wrap; }
    .desktop-nav { display: none; }
    .menu-toggle { display: flex; }
    .mobile-nav { flex: 0 0 100%; max-height: calc(100dvh - 70px); overflow-y: auto; }
    .mobile-nav.is-open { display: block; }
    .mobile-nav .nav-list { display: block; padding: 10px 0 20px; }
    .mobile-nav .nav-list a { padding: 13px 0; font-size: 12px; }
    .hero-cover { min-height: 60vh; padding-top: 115px; padding-bottom: 90px; }
    .hero-title { max-width: 700px; font-size: 33px; }
    .header-container, .hero-container, .page-container, .footer-inner { max-width: 720px; }
    .section-title { font-size: 30px; }
}
@media (max-width: 767px) {
    .header-container, .hero-container, .page-container, .footer-inner { max-width: 540px; }
    .hero-title { font-size: 30px; }
    .hero-date { font-size: 28px; }
}
@media (max-width: 575px) {
    .header-container { padding: 0 15px; }
    .conference-hero { padding-top: 70px; }
    .hero-cover { min-height: 70vh; padding: 62px 0 82px; background-image: linear-gradient(hsla(247, 44%, 12%, .6), hsla(247, 44%, 12%, .6)), url('/registration-assets/banner-mobile.jpg'); background-position: center center; }
    .hero-container { padding: 0 18px; text-align: center; }
    .hero-title { margin-bottom: 32px; font-size: clamp(25px, 7vw, 30px); line-height: 1.25; }
    .hero-title span { display: block; margin-top: 8px; }
    .hero-date { margin-bottom: 16px; font-size: 26px; }
    .hero-location { font-size: 16px; line-height: 1.55; }
    .hero-wave { height: 74px; margin-top: -64px; }
    .page-container { padding: 23px 20px 48px; }
    .section-title { margin: 0 0 28px; padding-bottom: 25px; font-size: 26px; }
    .section-title::after { width: 60px; height: 8px; }
    .form-field { margin-bottom: 23px; }
    .form-field label { margin-bottom: 8px; font-size: 14px; }
    .form-control { height: 52px; padding: 12px 14px; }
    .registration-note { margin: 28px 0; padding: 17px 18px; font-size: 13px; line-height: 1.85; }
    .checkbox-label { font-size: 14px; gap: 12px; }
    .participation { gap: 20px; margin-bottom: 26px; }
    .consent { padding-top: 24px; }
    .consent .checkbox-label { font-size: 13px; }
    .registration-button { width: 100%; min-width: 0; margin-top: 28px; }
    .footer-inner { display: block; padding: 24px 20px; font-size: 11px; }
    .footer-inner p { margin-bottom: 10px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }