:root {
    color-scheme: light;
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-muted: #eef2f7;
    --border: #d7dee8;
    --text: #172033;
    --muted: #657187;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #c2410c;
    --success-bg: #e8f7ee;
    --success-text: #166534;
    --danger-bg: #fff1ed;
    --danger-text: #9a3412;
    --shadow: 0 18px 48px rgba(23, 32, 51, .09);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
    color: inherit;
}

button,
input,
textarea {
    font: inherit;
}

.auth-screen {
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-panel {
    width: min(420px, 100%);
    padding: 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.brand-mark {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    margin-bottom: 18px;
    border-radius: 8px;
    background: #172033;
    color: #fff;
    font-weight: 800;
    letter-spacing: 0;
}

h1,
h2 {
    margin: 0;
    letter-spacing: 0;
}

h1 {
    font-size: 34px;
    line-height: 1.1;
}

h2 {
    font-size: 20px;
}

.auth-panel h1 {
    margin-bottom: 20px;
    font-size: 28px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 26px 32px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.eyebrow {
    margin-bottom: 4px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0;
}

.layout {
    display: grid;
    grid-template-columns: minmax(260px, 340px) minmax(0, 1fr);
    gap: 24px;
    width: min(1320px, 100%);
    margin: 0 auto;
    padding: 24px;
}

.events-panel,
.form-shell,
.detail-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.events-panel {
    align-self: start;
    padding: 18px;
}

.panel-heading,
.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.side-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    margin-bottom: 18px;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface-muted);
}

.side-nav a {
    min-height: 34px;
    display: grid;
    place-items: center;
    border-radius: 6px;
    color: var(--muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 750;
}

.side-nav a.active,
.side-nav a:hover {
    background: #fff;
    color: var(--text);
}

.section-title {
    padding: 22px 24px;
    border-bottom: 1px solid var(--border);
}

.section-title p,
.muted {
    margin: 6px 0 0;
    color: var(--muted);
}

.event-list {
    display: grid;
    gap: 8px;
    margin-top: 16px;
}

.subheading {
    margin-top: 26px;
}

.event-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text);
    text-decoration: none;
}

.event-row:hover,
.event-row.active {
    background: var(--surface-muted);
    border-color: var(--border);
}

.event-row strong,
.event-row small {
    display: block;
}

.event-row small {
    margin-top: 3px;
    color: var(--muted);
}

.metric {
    flex: 0 0 auto;
    color: var(--muted);
    font-size: 13px;
}

.workspace {
    min-width: 0;
}

.event-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    padding: 24px;
}

.stack {
    display: grid;
    gap: 16px;
}

label {
    display: grid;
    gap: 7px;
    color: var(--text);
    font-weight: 700;
}

label span {
    font-size: 13px;
}

input,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    color: var(--text);
    padding: 11px 12px;
    outline: none;
}

textarea {
    resize: vertical;
}

input:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .14);
}

input[readonly] {
    background: var(--surface-muted);
    color: var(--muted);
}

input[type="color"] {
    height: 44px;
    padding: 4px;
}

.span-2 {
    grid-column: span 2;
}

.color-pair {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.checkbox-panel {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.checkbox-panel legend {
    padding: 0 6px;
    font-size: 13px;
    font-weight: 800;
}

.checkbox-row {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: 10px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    font-weight: 500;
}

.checkbox-row input {
    width: auto;
    margin-top: 3px;
}

.checkbox-row strong,
.checkbox-row small {
    display: block;
}

.checkbox-row small {
    margin-top: 2px;
    color: var(--muted);
}

.form-actions {
    display: flex;
    justify-content: flex-start;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    font-weight: 750;
    color: var(--text);
    background: #fff;
}

.button.primary {
    background: var(--primary);
    color: #fff;
}

.button.primary:hover {
    background: var(--primary-dark);
}

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

.button.secondary:hover,
.button.ghost:hover {
    background: var(--surface-muted);
}

.button.ghost {
    border-color: var(--border);
}

.button.danger {
    border-color: #fed7aa;
    background: #fff7ed;
    color: var(--danger);
}

.button.full {
    width: 100%;
}

.notice {
    margin-bottom: 16px;
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: #fff;
}

.notice.success {
    border-color: #bbf7d0;
    background: var(--success-bg);
    color: var(--success-text);
}

.notice.danger {
    border-color: #fed7aa;
    background: var(--danger-bg);
    color: var(--danger-text);
}

.details-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, .8fr);
    gap: 24px;
    margin-top: 24px;
}

.detail-panel {
    padding: 22px 24px;
}

.copy-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    align-items: start;
    margin-top: 14px;
}

.copy-row textarea {
    min-height: 86px;
    font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    font-size: 13px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 16px 0;
}

.stats-grid div {
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface-muted);
}

.stats-grid strong,
.stats-grid span {
    display: block;
}

.stats-grid strong {
    font-size: 24px;
}

.stats-grid span {
    color: var(--muted);
    font-size: 13px;
}

@media (max-width: 860px) {
    .topbar,
    .layout {
        padding: 18px;
    }

    .topbar,
    .layout,
    .details-grid {
        display: grid;
        grid-template-columns: 1fr;
    }

    .event-form {
        grid-template-columns: 1fr;
    }

    .span-2 {
        grid-column: span 1;
    }

    .copy-row,
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .auth-panel,
    .events-panel,
    .form-shell,
    .detail-panel {
        border-radius: 8px;
    }

    .section-title {
        align-items: flex-start;
        display: grid;
    }

    .color-pair {
        grid-template-columns: 1fr;
    }
}