:root {
    --md-primary: #6750a4;
    --md-on-primary: #ffffff;
    --md-surface: #fffbfe;
    --md-surface-variant: #e7e0ec;
    --md-on-surface: #1c1b1f;
    --md-on-surface-muted: #49454f;
    --md-outline: #79747e;
    --md-success: #2e7d32;
    --md-error: #b3261e;
    --md-shadow: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
    --radius: 12px;
    --gap: 16px;
    --topbar-h: 56px;
    --side-w: 260px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--md-on-surface);
    background: var(--md-surface);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--md-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 960px; margin: 0 auto; padding: var(--gap); }
.container.narrow { max-width: 480px; }

h1 { font-size: 1.5rem; margin: 0 0 var(--gap); }
h2 { font-size: 1.2rem; margin: var(--gap) 0; }

.btn,
button {
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 0 16px;
    border: none;
    border-radius: 24px;
    background: var(--md-primary);
    color: var(--md-on-primary);
    font: inherit;
    font-weight: 500;
    text-decoration: none;
    transition: filter .15s;
}
.btn:hover, button:hover { filter: brightness(1.05); }
.btn.outline {
    background: transparent;
    color: var(--md-primary);
    border: 1px solid var(--md-outline);
}
.btn.danger { background: var(--md-error); }
.btn.success { background: var(--md-success); }
.btn.small { min-height: 36px; padding: 0 12px; font-size: .9rem; }

.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: var(--gap); }
.field label { font-size: .9rem; color: var(--md-on-surface-muted); }
.field input,
.field textarea,
.field select {
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--md-outline);
    border-radius: 8px;
    background: var(--md-surface);
    color: var(--md-on-surface);
    font: inherit;
}
.field input:focus { outline: 2px solid var(--md-primary); outline-offset: -1px; }

.alert { padding: 12px; border-radius: 8px; margin-bottom: var(--gap); }
.alert.error { background: #fdecea; color: var(--md-error); }
.alert.success { background: #e6f4ea; color: var(--md-success); }

.card {
    background: var(--md-surface);
    border: 1px solid var(--md-surface-variant);
    border-radius: var(--radius);
    padding: var(--gap);
    box-shadow: var(--md-shadow);
    margin-bottom: var(--gap);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: .8rem;
    background: var(--md-surface-variant);
    color: var(--md-on-surface-muted);
}
.badge.success { background: #e6f4ea; color: var(--md-success); }
.badge.warn { background: #fff4e5; color: #b26a00; }
.badge.error { background: #fdecea; color: var(--md-error); }

/* Admin shell */
.admin-body { background: #f5f1f7; }
.topbar {
    position: sticky; top: 0; z-index: 20;
    height: var(--topbar-h);
    display: flex; align-items: center; gap: 12px;
    padding: 0 12px;
    background: var(--md-primary); color: var(--md-on-primary);
    box-shadow: var(--md-shadow);
}
.topbar-title { flex: 1; font-size: 1.1rem; margin: 0; font-weight: 500; }
.topbar-user { opacity: .85; font-size: .9rem; }

.nav-toggle-btn {
    width: 40px; height: 40px; display: inline-flex; flex-direction: column;
    justify-content: center; gap: 5px; padding: 0 8px; cursor: pointer;
}
.nav-toggle-btn span {
    display: block; height: 2px; background: currentColor; border-radius: 2px;
}
.nav-toggle { display: none; }

.sidenav {
    position: fixed; top: 0; left: 0; bottom: 0; width: var(--side-w);
    background: var(--md-surface); border-right: 1px solid var(--md-surface-variant);
    transform: translateX(-100%); transition: transform .2s ease;
    z-index: 30; padding-top: var(--topbar-h);
}
.nav-toggle:checked ~ .sidenav { transform: translateX(0); }
.nav-scrim {
    position: fixed; inset: 0; background: rgba(0,0,0,.4);
    opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 25;
}
.nav-toggle:checked ~ .nav-scrim { opacity: 1; pointer-events: auto; }

.sidenav nav { display: flex; flex-direction: column; padding: 8px 0; }
.nav-link {
    display: block; padding: 12px 20px; color: var(--md-on-surface);
    background: transparent; border: none; text-align: left; font: inherit;
    border-radius: 0; min-height: auto; cursor: pointer; text-decoration: none;
}
.nav-link:hover { background: var(--md-surface-variant); text-decoration: none; }
.nav-link.active { background: var(--md-surface-variant); color: var(--md-primary); font-weight: 500; }
.nav-logout { margin-top: auto; padding: 0; }
.nav-logout button { width: 100%; }

.admin-main { padding: var(--gap); }

@media (min-width: 900px) {
    .nav-toggle-btn { display: none; }
    .sidenav { transform: translateX(0); padding-top: 0; top: var(--topbar-h); }
    .nav-scrim { display: none; }
    .admin-main { margin-left: var(--side-w); }
    .topbar { padding-left: 20px; }
}

/* Signup row list */
.signup-list { display: flex; flex-direction: column; gap: 12px; }
.signup-row {
    position: relative;
    background: var(--md-surface);
    border: 1px solid var(--md-surface-variant);
    border-radius: var(--radius);
    padding: 12px 48px 12px 12px;
    display: flex;
    gap: 8px;
}
.signup-row .row-info { flex: 1; min-width: 0; }
.signup-row .row-title-line {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    margin-bottom: 4px;
}
.signup-row .row-name { font-weight: 600; word-break: break-word; }
.signup-row .row-meta { color: var(--md-on-surface-muted); font-size: .9rem; word-break: break-word; }
.signup-row .row-device-note {
    color: var(--md-on-surface-muted);
    font-size: .75rem;
    margin-top: 6px;
    opacity: .8;
    word-break: break-word;
}

.badge.tiny {
    padding: 1px 8px; font-size: .72rem; line-height: 1.5;
}

.row-menu-wrap { position: absolute; top: 8px; right: 8px; }
.row-menu-btn {
    width: 36px; height: 36px; min-height: 36px; padding: 0;
    border-radius: 50%;
    background: transparent; color: var(--md-on-surface);
    font-size: 1.4rem; line-height: 1; font-weight: 700;
}
.row-menu-btn:hover { background: var(--md-surface-variant); filter: none; }
.row-menu {
    position: absolute; right: 0; top: 40px;
    background: var(--md-surface);
    border: 1px solid var(--md-surface-variant);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,.18);
    min-width: 220px;
    z-index: 10;
    padding: 4px 0;
    display: none;
}
.row-menu-wrap.open .row-menu { display: block; }
.menu-item {
    display: block; width: 100%; box-sizing: border-box;
    padding: 10px 16px; min-height: 44px;
    border: none; border-radius: 0;
    background: transparent; color: var(--md-on-surface);
    text-align: left; font: inherit; cursor: pointer; text-decoration: none;
    white-space: nowrap;
}
.menu-item:hover { background: var(--md-surface-variant); text-decoration: none; filter: none; }
.menu-item.danger { color: var(--md-error); }
.menu-item.danger:hover { background: #fdecea; }
.hidden-upload { display: none; }

.signup-row.search {
    flex-direction: column;
    padding: 12px;
    gap: 8px;
}
.signup-row.search .row-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 4px;
}

.chips-label {
    font-size: .85rem; color: var(--md-on-surface-muted);
    margin-bottom: 6px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: var(--gap); }

.sort-select {
    min-height: 44px;
    padding: 0 36px 0 14px;
    border: 1px solid var(--md-outline);
    border-radius: 24px;
    background: var(--md-surface);
    color: var(--md-on-surface);
    font: inherit;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8' width='12' height='8'%3E%3Cpath fill='%2349454f' d='M1.41 0L6 4.59 10.59 0 12 1.41 6 7.41 0 1.41z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    cursor: pointer;
    margin-bottom: var(--gap);
}
.sort-select:focus { outline: 2px solid var(--md-primary); outline-offset: -1px; }
.chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 12px; border-radius: 999px;
    background: var(--md-surface-variant); color: var(--md-on-surface);
    font-size: .9rem; cursor: pointer; user-select: none;
    border: 1px solid transparent;
}
.chip input { display: none; }
.chip.active { background: var(--md-primary); color: var(--md-on-primary); }

.toolbar { display: flex; gap: 8px; margin-bottom: var(--gap); flex-wrap: wrap; }
.toolbar input[type=search] {
    flex: 1; min-width: 200px;
    min-height: 44px; padding: 0 12px;
    border: 1px solid var(--md-outline); border-radius: 24px;
    font: inherit; background: var(--md-surface);
}

.pager { display: flex; gap: 8px; justify-content: center; margin-top: var(--gap); }

/* Scanner */
.scan-shell { position: fixed; inset: 0; background: #000; }
.scan-video { width: 100%; height: 100%; object-fit: cover; }
.scan-overlay {
    position: absolute; inset: 0; pointer-events: none;
    display: flex; align-items: center; justify-content: center;
}
.scan-window {
    width: 70vmin; height: 70vmin; max-width: 320px; max-height: 320px;
    border: 2px solid #fff; border-radius: 16px;
    box-shadow: 0 0 0 9999px rgba(0,0,0,.6);
}
.scan-instructions {
    position: absolute; bottom: 20%; left: 0; right: 0;
    text-align: center; color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.6);
}
.scan-back {
    position: absolute; top: 16px; left: 16px; z-index: 5;
    background: rgba(0,0,0,.6); color: #fff;
}

.modal-backdrop {
    position: fixed; inset: 0; background: rgba(0,0,0,.55);
    display: flex; align-items: center; justify-content: center; z-index: 50;
    padding: 20px;
}
.modal {
    background: var(--md-surface); border-radius: var(--radius); max-width: 420px;
    width: 100%; padding: 20px; box-shadow: var(--md-shadow);
}
.modal h2 { margin-top: 0; word-break: break-word; }
.modal p {
    margin: 8px 0;
    overflow-wrap: anywhere;
    word-break: break-word;
    max-height: 40vh;
    overflow-y: auto;
}
.modal.success { border-top: 4px solid var(--md-success); }
.modal.warn { border-top: 4px solid #b26a00; }
.modal.error { border-top: 4px solid var(--md-error); }
.modal.info { border-top: 4px solid var(--md-primary); }