:root {
    --ink: #13213c;
    --muted: #60708a;
    --navy: #07152f;
    --blue: #1f62e8;
    --blue-dark: #174db5;
    --teal: #53ddc1;
    --surface: #ffffff;
    --canvas: #f3f6fb;
    --border: #ced7e5;
    --error: #b42318;
    --error-bg: #fff3f1;
    --success: #13795b;
    --shadow: 0 24px 70px rgba(7, 21, 47, 0.16);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--ink);
    background: var(--canvas);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-width: 320px;
    min-height: 100vh;
    line-height: 1.5;
    background:
        radial-gradient(circle at 14% 10%, rgba(83, 221, 193, 0.12), transparent 27rem),
        var(--canvas);
}

.page-shell {
    display: grid;
    min-height: 100vh;
}

.event-intro {
    display: flex;
    flex-direction: column;
    min-height: 18rem;
    padding: 1.5rem;
    color: #fff;
    background:
        linear-gradient(150deg, rgba(31, 98, 232, 0.22), transparent 52%),
        var(--navy);
}

.brand {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 0.75rem;
    color: #fff;
    font-size: 0.92rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-decoration: none;
}

.brand-mark {
    display: grid;
    width: 2.5rem;
    height: 2.5rem;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 0.75rem;
    color: var(--teal);
    background: rgba(255, 255, 255, 0.08);
    letter-spacing: -0.04em;
}

.intro-copy { margin: auto 0; max-width: 38rem; padding: 3rem 0; }
.intro-copy h1 { margin: 0.5rem 0 1rem; max-width: 12ch; font-size: clamp(2rem, 7vw, 4.6rem); line-height: 1.03; letter-spacing: -0.045em; }
.intro-copy > p:last-child { max-width: 35rem; margin: 0; color: #c3cde0; font-size: 1.04rem; }
.eyebrow { margin: 0; color: var(--blue); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.13em; text-transform: uppercase; }
.event-intro .eyebrow { color: var(--teal); }
.privacy-note { margin: 0; color: #91a1bc; font-size: 0.78rem; }

.registration-panel {
    width: 100%;
    max-width: 48rem;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
    background: var(--surface);
}

.form-header { margin-bottom: 2rem; }
.form-header h2, .success-state h2 { margin: 0.35rem 0 0.45rem; font-size: clamp(1.8rem, 5vw, 2.5rem); line-height: 1.1; letter-spacing: -0.035em; }
.form-header > p:last-child, .success-state > p { margin: 0; color: var(--muted); }

.field-grid { display: grid; gap: 1.15rem; }
.field { margin-bottom: 1.15rem; }
.field label { display: block; margin-bottom: 0.42rem; font-size: 0.88rem; font-weight: 700; }
.field input {
    display: block;
    width: 100%;
    min-height: 3.15rem;
    border: 1px solid var(--border);
    border-radius: 0.68rem;
    padding: 0.75rem 0.9rem;
    color: var(--ink);
    background: #fff;
    font: inherit;
    outline: none;
    transition: border-color 150ms ease, box-shadow 150ms ease;
}
.field input::placeholder { color: #8d99ab; }
.field input:hover { border-color: #9cabc0; }
.field input:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(31, 98, 232, 0.14); }
.field input[aria-invalid="true"] { border-color: var(--error); }
.field input[aria-invalid="true"]:focus { box-shadow: 0 0 0 4px rgba(180, 35, 24, 0.12); }
.field-hint, .field-error { margin: 0.4rem 0 0; font-size: 0.78rem; }
.field-hint { color: var(--muted); }
.field-error { color: var(--error); font-weight: 650; }

.alert {
    display: grid;
    gap: 0.15rem;
    margin: 0 0 1.4rem;
    border-left: 4px solid var(--error);
    border-radius: 0.45rem;
    padding: 0.85rem 1rem;
    color: #731b14;
    background: var(--error-bg);
    font-size: 0.88rem;
    outline: none;
}

.submit-button, .secondary-action {
    display: inline-flex;
    min-height: 3.25rem;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    border: 0;
    border-radius: 0.7rem;
    padding: 0.8rem 1.35rem;
    color: #fff;
    background: var(--blue);
    box-shadow: 0 8px 22px rgba(31, 98, 232, 0.22);
    font: inherit;
    font-weight: 750;
    text-decoration: none;
    cursor: pointer;
    transition: background 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}
.submit-button { width: 100%; }
.submit-button:hover, .secondary-action:hover { background: var(--blue-dark); transform: translateY(-1px); box-shadow: 0 10px 28px rgba(31, 98, 232, 0.29); }
.submit-button:focus-visible, .secondary-action:focus-visible, .brand:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; }
.submit-button:disabled { opacity: 0.75; cursor: wait; transform: none; }
.spinner { display: none; width: 1.05rem; height: 1.05rem; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin 700ms linear infinite; }
.is-loading .spinner { display: inline-block; }
.required-note { margin: 0.75rem 0 0; color: var(--muted); font-size: 0.76rem; text-align: center; }

.success-state { max-width: 31rem; margin: auto; padding: 3rem 0; text-align: center; }
.success-icon { display: grid; width: 4rem; height: 4rem; margin: 0 auto 1.5rem; place-items: center; border-radius: 50%; color: #fff; background: var(--success); font-size: 1.8rem; font-weight: 800; }
.success-state .secondary-action { margin-top: 1.8rem; }

@keyframes spin { to { transform: rotate(360deg); } }

@media (min-width: 42rem) {
    .event-intro { padding: 2.25rem 3rem; }
    .registration-panel { margin: 2rem auto; border-radius: 1.2rem; padding: 3rem; box-shadow: var(--shadow); }
    .field-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 64rem) {
    .page-shell { grid-template-columns: minmax(25rem, 0.9fr) minmax(38rem, 1.1fr); align-items: stretch; }
    .event-intro { min-height: 100vh; padding: 2.5rem clamp(3rem, 6vw, 7rem); }
    .registration-panel { align-self: center; margin: 2.5rem auto; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}