:root {
    color-scheme: light;
    --green: #078444;
    --green-dark: #063c2b;
    --red: #ce1126;
    --ink: #15211c;
    --muted: #637069;
    --surface: #ffffff;
    --line: #d9e3dd;
    --background: #f3f7f4;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--background);
    font-family: Tahoma, Arial, sans-serif;
}

button,
input,
select {
    font: inherit;
}

.site-header {
    min-height: 88px;
    padding: 12px clamp(18px, 5vw, 72px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}

.brand img {
    display: block;
    width: min(230px, 48vw);
    height: 64px;
    object-fit: contain;
}

.back-link {
    color: var(--green-dark);
    font-weight: 700;
}

.page-shell {
    width: min(940px, calc(100% - 28px));
    margin: 34px auto 64px;
}

.intro {
    margin-bottom: 22px;
}

.intro h1 {
    margin: 5px 0 10px;
    font-size: clamp(1.8rem, 5vw, 3rem);
}

.intro p {
    color: var(--muted);
    line-height: 1.8;
}

.eyebrow {
    margin: 0;
    color: var(--green);
    font-weight: 800;
}

.mode-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.mode-tabs button,
button {
    min-height: 46px;
    padding: 10px 18px;
    border: 1px solid var(--green);
    border-radius: 6px;
    color: #fff;
    background: var(--green);
    font-weight: 800;
    cursor: pointer;
}

.mode-tabs button {
    color: var(--green-dark);
    background: transparent;
}

.mode-tabs button.is-active {
    color: #fff;
    background: var(--green);
}

button.secondary {
    color: var(--green-dark);
    background: #fff;
}

.panel,
.event-form,
.qr-result,
.event-card {
    padding: clamp(18px, 4vw, 30px);
    background: var(--surface);
    border: 1px solid var(--line);
    border-top: 3px solid var(--green);
    border-radius: 8px;
}

.event-summary {
    margin-bottom: 18px;
    padding: 16px;
    color: var(--green-dark);
    background: #edf7f1;
    border-right: 4px solid var(--green);
    line-height: 1.8;
}

form {
    display: grid;
    gap: 16px;
}

label {
    display: grid;
    gap: 8px;
    font-weight: 700;
}

input,
select {
    width: 100%;
    min-height: 48px;
    padding: 10px 12px;
    border: 1px solid #b9c9c0;
    border-radius: 6px;
    background: #fff;
}

input:focus,
select:focus,
button:focus-visible {
    outline: 3px solid rgba(7, 132, 68, 0.2);
    outline-offset: 2px;
}

.form-message {
    min-height: 24px;
    margin: 0;
    color: var(--green);
    font-weight: 700;
}

.form-message.error {
    color: var(--red);
}

.workspace-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 22px;
}

.event-form {
    margin-bottom: 18px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.qr-result {
    margin-bottom: 24px;
    text-align: center;
}

#qr-code {
    width: fit-content;
    margin: 0 auto 18px;
    padding: 14px;
    background: #fff;
}

#qr-code img,
#qr-code canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.event-list {
    display: grid;
    gap: 14px;
}

.event-card h3 {
    margin-top: 0;
}

.event-meta {
    color: var(--muted);
    line-height: 1.8;
}

.attendee-list {
    margin: 14px 0 0;
    padding: 0;
    list-style: none;
}

.attendee-list li {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-top: 1px solid var(--line);
}

[hidden] {
    display: none !important;
}

@media (max-width: 680px) {
    .site-header,
    .workspace-header {
        align-items: stretch;
        flex-direction: column;
    }

    .brand img {
        width: min(270px, 80vw);
        height: 74px;
    }

    .mode-tabs,
    .form-grid {
        grid-template-columns: 1fr;
    }

    .mode-tabs {
        display: grid;
    }

    .attendee-list li {
        flex-direction: column;
        gap: 4px;
    }
}