:root {
    --color-bg: oklch(98% 0.005 260);
    --color-surface: oklch(100% 0 0);
    --color-ink: oklch(24% 0.02 260);
    --color-muted: oklch(58% 0.02 260);
    --color-line: oklch(90% 0.01 260);
    --color-accent: oklch(52% 0.16 255);
    --color-accent-soft: oklch(95% 0.04 255);
    --color-warn: oklch(58% 0.16 55);
    --color-warn-soft: oklch(95% 0.05 70);
    --color-danger: oklch(55% 0.19 25);
    --color-danger-soft: oklch(95% 0.05 25);

    --radius: 10px;
    --radius-sm: 7px;
    --space: clamp(1rem, 0.6rem + 1.4vw, 1.75rem);
    --shadow: 0 1px 2px oklch(20% 0.02 260 / 0.06), 0 8px 24px oklch(20% 0.02 260 / 0.06);

    --font: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font);
    color: var(--color-ink);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-header {
    padding: var(--space) var(--space) 0;
    max-width: 1180px;
    margin: 0 auto;
}

.app-header__eyebrow {
    margin: 0;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    font-weight: 600;
}

.app-header__title {
    margin: 0.15rem 0 0;
    font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.1rem);
    letter-spacing: -0.01em;
}

.layout {
    max-width: 1180px;
    margin: 0 auto;
    padding: var(--space);
    display: grid;
    gap: var(--space);
}

.banner {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    display: grid;
    gap: 0.2rem;
}

.banner--error {
    background: var(--color-danger-soft);
    color: var(--color-danger);
    border: 1px solid oklch(80% 0.08 25);
}

.banner--warn {
    background: var(--color-warn-soft);
    color: var(--color-warn);
    border: 1px solid oklch(80% 0.1 70);
}

.banner--info {
    background: var(--color-accent-soft);
    color: var(--color-accent);
    border: 1px solid oklch(85% 0.06 255);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filters {
    display: grid;
    gap: 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    padding: 1rem 1.15rem;
    box-shadow: var(--shadow);
}

.filters__group {
    display: grid;
    grid-template-columns: 5.5rem 1fr;
    align-items: center;
    gap: 0.75rem;
}

.filters__label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-muted);
}

.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.32rem 0.7rem;
    border: 1px solid var(--color-line);
    border-radius: 999px;
    background: var(--color-bg);
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
    transition: background 150ms, border-color 150ms;
}

.chip:has(input:checked) {
    background: var(--color-accent-soft);
    border-color: var(--color-accent);
    color: var(--color-accent);
    font-weight: 600;
}

.chip--muted:has(input:checked) {
    background: oklch(93% 0.01 260);
    border-color: var(--color-muted);
    color: var(--color-muted);
}

.chip input {
    accent-color: var(--color-accent);
    margin: 0;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.toolbar__actions {
    display: flex;
    gap: 0.5rem;
}

.toolbar__count {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.toolbar__count strong {
    color: var(--color-ink);
    font-variant-numeric: tabular-nums;
}

.btn {
    font: inherit;
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-line);
    background: var(--color-surface);
    cursor: pointer;
    transition: background 150ms, border-color 150ms, transform 80ms;
}

.btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn:active {
    transform: translateY(1px);
}

.roster {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    font-size: 0.9rem;
}

.roster thead th {
    text-align: left;
    padding: 0.7rem 0.8rem;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    background: oklch(97% 0.01 260);
    border-bottom: 1px solid var(--color-line);
    white-space: nowrap;
}

.roster tbody td {
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--color-line);
    vertical-align: middle;
}

.roster tbody tr:last-child td {
    border-bottom: none;
}

.roster__row:hover {
    background: oklch(98% 0.01 255);
}

.roster__row--excluded {
    color: var(--color-muted);
    background: oklch(98.5% 0.003 260);
}

.roster__check {
    width: 2.6rem;
    text-align: center;
}

.roster__id,
.roster__email {
    font-variant-numeric: tabular-nums;
    font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
    font-size: 0.83rem;
}

.row-select {
    width: 1.05rem;
    height: 1.05rem;
    accent-color: var(--color-accent);
}

.grade-tag {
    display: inline-block;
    min-width: 2.4rem;
    text-align: center;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.8rem;
}

.grade-tag--muted {
    background: oklch(94% 0.01 260);
    color: var(--color-muted);
}

.warn {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
}

.warn--exclude {
    background: var(--color-danger-soft);
    color: var(--color-danger);
}

.warn--check {
    background: var(--color-warn-soft);
    color: var(--color-warn);
}

.empty {
    text-align: center;
    color: var(--color-muted);
    padding: 2rem;
}

.app-header__nav {
    margin-top: 0.4rem;
}

.app-header__nav a {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
}

.app-header__nav a:hover {
    text-decoration: underline;
}

.checkbox-field {
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
    font-size: 0.85rem;
    color: var(--color-muted);
    cursor: pointer;
    padding-top: 0.3rem;
}

.checkbox-field input {
    margin-top: 0.15rem;
    accent-color: var(--color-accent);
}

/* --- Milestone 2: compose / result --- */

.btn--primary {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    font-weight: 600;
}

.btn--primary:hover {
    background: oklch(46% 0.16 255);
    color: white;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    padding: 1.1rem 1.15rem;
    box-shadow: var(--shadow);
    display: grid;
    gap: 0.8rem;
}

.card__title {
    margin: 0;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.count-badge {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-accent-soft);
    padding: 0.1rem 0.55rem;
    border-radius: 999px;
}

.items {
    width: 100%;
    border-collapse: collapse;
}

.items th {
    text-align: left;
    font-size: 0.75rem;
    color: var(--color-muted);
    padding: 0.3rem 0.4rem;
}

.items td {
    padding: 0.3rem 0.4rem;
}

.items__num {
    width: 7rem;
    text-align: right;
}

.items__act {
    width: 4rem;
}

.item-row input,
.field input,
.field textarea {
    width: 100%;
    font: inherit;
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
}

.item-row input:focus,
.field input:focus,
.field textarea:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
    border-color: var(--color-accent);
}

.field {
    display: grid;
    gap: 0.3rem;
}

.field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-muted);
}

.recipients {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.35rem;
}

.recipient {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 0.5rem;
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    flex-wrap: wrap;
}

.recipient__grade {
    min-width: 2.4rem;
    text-align: center;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-accent-soft);
    border-radius: var(--radius-sm);
    padding: 0.1rem 0.4rem;
}

.recipient__name {
    font-weight: 600;
}

.recipient__email {
    color: var(--color-muted);
    font-size: 0.85rem;
    font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
}

.excluded {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.excluded summary {
    cursor: pointer;
    color: var(--color-danger);
}

.actions-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding-top: 0.5rem;
}

.summary-cards {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.summary-card {
    flex: 1 1 8rem;
    display: grid;
    gap: 0.2rem;
    padding: 1rem 1.15rem;
    border-radius: var(--radius);
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    box-shadow: var(--shadow);
}

.summary-card__num {
    font-size: 2rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}

.summary-card__label {
    font-size: 0.8rem;
    color: var(--color-muted);
}

.summary-card--ok .summary-card__num {
    color: oklch(55% 0.15 150);
}

.summary-card--fail .summary-card__num {
    color: var(--color-danger);
}

.summary-card--skip .summary-card__num {
    color: var(--color-warn);
}

.pill {
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
}

.pill--ok {
    background: oklch(93% 0.06 150);
    color: oklch(45% 0.14 150);
}

.pill--fail {
    background: var(--color-danger-soft);
    color: var(--color-danger);
}

.pill--skip {
    background: var(--color-warn-soft);
    color: var(--color-warn);
}

@media (max-width: 720px) {
    .filters__group {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }

    .roster {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}

/* ログイン中ユーザー表示（ヘッダ右上） */
.app-header {
    position: relative;
}

.app-header__user {
    position: absolute;
    top: var(--space);
    right: var(--space);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.8rem;
}

.user-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--color-muted, #6b7280);
}

.user-chip__name {
    font-weight: 600;
    color: var(--color-text, #1f2937);
}

.user-chip__role {
    padding: 0.08rem 0.45rem;
    border-radius: 999px;
    background: var(--color-accent, #2f6df6);
    color: #fff;
    font-size: 0.68rem;
    font-weight: 700;
}

.user-chip__logout {
    color: var(--color-accent, #2f6df6);
    text-decoration: none;
    font-weight: 600;
}

.user-chip__logout:hover {
    text-decoration: underline;
}

@media (max-width: 640px) {
    .app-header__user {
        position: static;
        margin-top: 0.6rem;
        justify-content: flex-end;
    }
}

/* 承認ワークフロー用 */
.summary-list {
    display: grid;
    gap: 0.5rem;
    margin: 0;
}

.summary-list > div {
    display: flex;
    gap: 0.75rem;
}

.summary-list dt {
    flex: 0 0 6rem;
    color: var(--color-muted, #6b7280);
    font-size: 0.85rem;
}

.summary-list dd {
    margin: 0;
    font-weight: 600;
}

.field__hint {
    margin: 0 0 0.5rem;
    font-size: 0.82rem;
    color: var(--color-muted, #6b7280);
}

.recipient__check {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
}

.card--danger {
    border-color: #f0c8c8;
    background: #fdf5f5;
}

.btn--danger {
    background: #c0392b;
    color: #fff;
    border-color: #c0392b;
}

.btn--danger:hover {
    background: #a93226;
    border-color: #a93226;
}