/* ボタン、見出し、通知、ダイアログなど画面横断の部品を定義する。 */
.button {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.62rem 1rem;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 700;
    line-height: 1.2;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.button:hover:not(:disabled) {
    transform: translateY(-1px);
}

.button:disabled {
    border-color: var(--color-border);
    color: #939cab;
    background: #eef0f3;
    cursor: not-allowed;
}

.button--primary {
    color: #fff;
    background: var(--color-primary-strong);
    box-shadow: 0 6px 16px rgba(185, 71, 12, 0.18);
}

.button--primary:hover:not(:disabled) {
    background: #963608;
}

.button--secondary {
    border-color: #c9d0da;
    color: var(--color-ink);
    background: #fff;
}

.button--secondary:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.button--ghost {
    color: var(--color-ink);
    background: transparent;
}

.button--ghost:hover {
    color: var(--color-primary-strong);
    background: var(--color-primary-soft);
}

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

.button--danger-outline {
    border-color: #e7b7b2;
    color: var(--color-danger);
    background: #fff;
}

.button--danger-outline:hover:not(:disabled) {
    background: var(--color-danger-soft);
}

.page-heading {
    display: flex;
    align-items: stretch;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.page-heading__mark {
    width: 8px;
    flex: 0 0 8px;
    border-radius: 999px;
    background: linear-gradient(var(--color-primary), #f7b243);
}

.page-heading h1 {
    margin: 0;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    line-height: 1.25;
}

.page-heading p {
    margin: 0.35rem 0 0;
    color: var(--color-muted);
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.section-heading > span {
    color: var(--color-primary);
    font-size: 1.4rem;
}

.section-heading h2,
.minor-heading {
    margin: 0;
    font-size: clamp(1.35rem, 3vw, 1.75rem);
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.toolbar--start { justify-content: flex-start; }
.toolbar--between { justify-content: space-between; }
.toolbar__group { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.notice {
    margin: 1.25rem 0;
    padding: 1rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    background: #fff;
}

.notice p { margin: 0; }

.notice--warning {
    width: min(calc(100% - 2rem), var(--content-width));
    margin: 1rem auto 0;
    border-color: #ead078;
    color: var(--color-warning);
    background: var(--color-warning-soft);
}

.empty-state,
.error-state,
.fatal-error,
.page-loading {
    padding: 3rem 1.25rem;
    border: 1px dashed #c8ced7;
    border-radius: var(--radius-md);
    color: var(--color-muted);
    background: #fff;
    text-align: center;
}

.error-state h1,
.fatal-error h1 {
    margin-top: 0;
    color: var(--color-ink);
}

.page-loading {
    min-height: 260px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.section-divider {
    height: 1px;
    margin: clamp(2.5rem, 6vw, 5rem) 0;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.content-section + .content-section {
    margin-top: 3.5rem;
}

.content-dialog {
    width: min(860px, calc(100vw - 2rem));
    max-height: min(86vh, 900px);
    padding: 0;
    border: 0;
    border-radius: var(--radius-md);
    color: var(--color-ink);
    background: transparent;
    box-shadow: var(--shadow-md);
}

.content-dialog::backdrop {
    background: rgba(18, 29, 43, 0.66);
    backdrop-filter: blur(3px);
}

.content-dialog__surface {
    max-height: min(86vh, 900px);
    display: grid;
    grid-template-rows: auto 1fr;
    overflow: hidden;
    background: #fff;
}

.content-dialog__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.content-dialog__header h2 { margin: 0; }

.content-dialog__body {
    padding: clamp(1rem, 3vw, 2rem);
    overflow: auto;
}

.icon-button {
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    color: var(--color-ink);
    background: var(--color-surface-alt);
    cursor: pointer;
    font-size: 1.75rem;
    line-height: 1;
}

.icon-button:hover { background: var(--color-primary-soft); }

.share-links {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    margin: 2rem 0 1rem;
}

.share-links a {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-surface-alt);
}

.toast {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    z-index: 1200;
    max-width: min(420px, calc(100vw - 2rem));
    padding: 0.9rem 1.15rem;
    border-radius: var(--radius-sm);
    color: #fff;
    background: var(--color-ink);
    box-shadow: var(--shadow-md);
}

@media (max-width: 640px) {
    .toolbar--between {
        align-items: stretch;
        flex-direction: column;
    }

    .toolbar__group,
    .toolbar--between > .button {
        width: 100%;
    }

    .toolbar__group .button {
        flex: 1 1 auto;
    }

    .content-dialog {
        width: calc(100vw - 1rem);
        max-height: calc(100vh - 1rem);
    }

    .content-dialog__surface {
        max-height: calc(100vh - 1rem);
    }
}