* {
    box-sizing: border-box;
}

:root {
    color-scheme: light;
    --bg: #f5f7f8;
    --card: #ffffff;
    --text: #1f2933;
    --muted: #6b7280;
    --line: #e5e7eb;
    --accent: #178b55;
    --accent-dark: #0f6f42;
    --danger: #c0392b;
    --header: rgba(255, 255, 255, .96);
    --input: #fff;
    --input-border: #cfd5db;
    --subtle: #f0f2f4;
    --tab: #e8ecef;
    --on-accent: #fff;
    --focus-ring: rgba(23, 139, 85, .12);
    --shadow: rgba(31, 41, 51, .035);
    --reply-bg: #ebf8f1;
    --error-text: #8f2d24;
    --error-bg: #fff0ee;
    --error-border: #f2c8c2;
    --success-text: #0e6840;
    --success-bg: #ebf8f1;
    --success-border: #b9e6ce;
    --info-text: #345;
    --info-bg: #eef3f6;
    --info-border: #dbe3e8;
    --content-text: #4b5563;
    --radius: 14px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #141b20;
    --card: #202a31;
    --text: #edf2f4;
    --muted: #a8b5bd;
    --line: #39464f;
    --accent: #64d9a0;
    --accent-dark: #86e7b6;
    --danger: #ff938b;
    --header: rgba(25, 33, 39, .96);
    --input: #182127;
    --input-border: #52616b;
    --subtle: #34414a;
    --tab: #34414a;
    --on-accent: #10271b;
    --focus-ring: rgba(100, 217, 160, .22);
    --shadow: rgba(0, 0, 0, .16);
    --reply-bg: #1c3a2d;
    --error-text: #ffb3ac;
    --error-bg: #422b2b;
    --error-border: #81504b;
    --success-text: #9af0bc;
    --success-bg: #1d3d2d;
    --success-border: #3c7352;
    --info-text: #bdd6e5;
    --info-bg: #253743;
    --info-border: #426072;
    --content-text: #c1cbd1;
}

html {
    background: var(--bg);
}

body {
    margin: 0;
    color: var(--text);
    background: var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
        "Yu Gothic", Meiryo, sans-serif;
    line-height: 1.65;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--header);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(8px);
}

.header-inner {
    width: min(760px, calc(100% - 28px));
    min-height: 62px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: nowrap;
}

.site-title {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: var(--text);
    font-weight: 800;
    font-size: 20px;
    text-decoration: none;
}

.theme-toggle {
    flex: 0 0 auto;
    white-space: nowrap;
    margin-left: auto;
    padding: 6px 10px;
    border: 1px solid var(--line);
    color: var(--text);
    background: var(--subtle);
    font-size: 13px;
    font-weight: 600;
}

.theme-toggle:hover {
    color: var(--text);
    background: var(--tab);
}

.nav {
    flex: 0 0 auto;
    flex-wrap: nowrap;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 14px;
}

.nav-primary {
    padding: 7px 12px;
    color: var(--on-accent);
    background: var(--accent);
    border-radius: 999px;
}

.nav-primary:hover {
    background: var(--accent-dark);
    text-decoration: none;
}

.container {
    width: min(760px, calc(100% - 28px));
    margin: 28px auto 60px;
}

.intro {
    margin-bottom: 20px;
}

.intro h1,
.auth-card h1,
.profile-card h1 {
    margin: 0 0 6px;
    font-size: 28px;
    line-height: 1.25;
}

.intro p {
    margin: 0;
    color: var(--muted);
}

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 2px 10px var(--shadow);
}

.composer {
    padding: 20px;
    margin-bottom: 26px;
}

.composer h2 {
    margin: 0 0 14px;
    font-size: 18px;
}

label {
    display: block;
    margin-bottom: 14px;
    font-weight: 700;
    font-size: 14px;
}

input,
textarea {
    width: 100%;
    margin-top: 6px;
    padding: 11px 12px;
    border: 1px solid var(--input-border);
    border-radius: 9px;
    color: var(--text);
    background: var(--input);
    font: inherit;
    outline: none;
}

input:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
    min-height: 125px;
    resize: vertical;
}

button,
.button-primary,
.button-secondary {
    border: 0;
    border-radius: 9px;
    padding: 10px 18px;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

button,
.button-primary {
    color: var(--on-accent);
    background: var(--accent);
}

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

.button-secondary {
    color: var(--text);
    background: var(--subtle);
    text-decoration: none;
}

.form-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.muted {
    color: var(--muted);
    font-weight: 400;
}

.posting-as {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 14px;
    font-size: 14px;
}

.posting-as span,
.posting-as small {
    color: var(--muted);
}

.section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 2px 10px;
}

.section-heading h2 {
    margin: 0;
    font-size: 18px;
}

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

.post {
    position: relative;
    padding: 18px;
    margin-bottom: 12px;
}

.sort-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 14px;
}

.sort-tabs a {
    padding: 7px 12px;
    border-radius: 9px;
    background: var(--tab);
    font-size: 14px;
}

.sort-tabs a[aria-current="page"] {
    color: var(--on-accent);
    background: var(--accent);
}

.thread-row {
    padding: 16px 18px;
    margin-bottom: 12px;
}

.thread-row h3 {
    margin: 0 0 8px;
    font-size: 18px;
    overflow-wrap: anywhere;
}

.thread-preview {
    margin: 0 0 12px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.thread-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 16px;
    color: var(--muted);
    font-size: 13px;
}

.breadcrumb {
    margin-bottom: 14px;
}

.thread-heading {
    padding: 20px;
    margin-bottom: 26px;
}

.thread-heading h1 {
    margin: 0 0 10px;
    font-size: 26px;
    overflow-wrap: anywhere;
}

.thread-context {
    display: inline-block;
    margin-bottom: 8px;
    font-weight: 700;
}

.post-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
}

.author {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.avatar,
.profile-avatar {
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    color: var(--on-accent);
    background: var(--accent);
    font-weight: 900;
    border-radius: 50%;
}

.avatar {
    width: 40px;
    height: 40px;
}

.avatar.anonymous {
    color: var(--muted);
    background: var(--tab);
}

.post-reply-number {
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    text-decoration: none;
}

.post-reply-number:hover,
.post-reply-number:focus-visible {
    color: var(--on-accent);
    background: var(--accent-dark);
    text-decoration: none;
}

.reply-reference {
    margin: 12px 0 -6px 50px;
    color: var(--muted);
    font-size: 13px;
}

.post,
#reply-title {
    scroll-margin-top: var(--anchor-offset, 96px);
}

.post:target {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.post-replies {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 12px;
    margin-top: 14px;
    padding: 10px 12px;
    border-radius: 9px;
    background: var(--reply-bg);
    color: var(--muted);
    font-size: 13px;
}

.post-replies a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.replying-to {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin: -4px 0 14px;
    padding: 10px 12px;
    border-radius: 9px;
    color: var(--accent-dark);
    background: var(--reply-bg);
    font-size: 14px;
}

.author-name {
    color: var(--text);
    font-weight: 800;
}

.author-sub {
    color: var(--muted);
    font-size: 12px;
}

.post-meta {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-size: 12px;
}

.post-body {
    margin-top: 14px;
    overflow-wrap: anywhere;
    white-space: normal;
}

.post .post-meta {
    justify-content: flex-end;
}

.post-report-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 4px 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--subtle);
    color: var(--muted);
    font-size: 12px;
    white-space: nowrap;
}

.post-report-button:hover,
.post-report-button:focus-visible {
    border-color: var(--danger);
    background: var(--tab);
    color: var(--danger);
    text-decoration: none;
}

.delete-form {
    margin-top: 12px;
    text-align: right;
}

.link-button {
    padding: 2px 0;
    color: var(--muted);
    background: transparent;
    font-weight: 500;
    font-size: 12px;
}

.link-button:hover {
    background: transparent;
}

.link-button.danger {
    color: var(--danger);
}

.empty {
    padding: 36px 18px;
    text-align: center;
    color: var(--muted);
    background: var(--card);
    border: 1px dashed var(--input-border);
    border-radius: var(--radius);
}

.pagination {
    margin-top: 22px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 14px;
    text-align: center;
}

.pagination a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    box-sizing: border-box;
    padding: 8px 16px;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: var(--subtle);
    color: var(--text);
    font-weight: 700;
    white-space: nowrap;
    text-decoration: none;
}

.pagination a:hover,
.pagination a:focus-visible {
    border-color: var(--accent);
    background: var(--tab);
    color: var(--accent);
    text-decoration: none;
}

.auth-wrap {
    width: min(480px, 100%);
    margin: 42px auto;
}

.auth-card {
    padding: 24px;
}

.auth-card>.muted {
    margin-top: 0;
}

.auth-card small {
    display: block;
    margin-top: 4px;
    color: var(--muted);
    font-weight: 400;
}

.wide {
    width: 100%;
}

.auth-switch {
    margin: 18px 0 0;
    text-align: center;
    color: var(--muted);
    font-size: 14px;
}

.error-box,
.flash {
    padding: 11px 13px;
    margin-bottom: 16px;
    border-radius: 9px;
}

.error-box,
.flash-error {
    color: var(--error-text);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
}

.flash-success {
    color: var(--success-text);
    background: var(--success-bg);
    border: 1px solid var(--success-border);
}

.flash-info {
    color: var(--info-text);
    background: var(--info-bg);
    border: 1px solid var(--info-border);
}

.profile-card {
    padding: 22px;
    margin-bottom: 28px;
}

.profile-top {
    display: flex;
    align-items: center;
    gap: 14px;
}

.profile-avatar {
    width: 64px;
    height: 64px;
    font-size: 24px;
}

.profile-main {
    min-width: 0;
    flex: 1;
}

.profile-main h1 {
    margin: 0;
}

.profile-id {
    color: var(--muted);
    font-size: 14px;
}

.profile-bio {
    margin-top: 20px;
    overflow-wrap: anywhere;
}

.profile-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    padding-top: 16px;
    margin-top: 16px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 13px;
}

.profile-post-meta {
    justify-content: flex-end;
}

.post-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 14px;
    margin-top: 12px;
}

.post-actions .delete-form {
    margin-top: 0;
}

.post-action-link {
    color: var(--muted);
    font-size: 12px;
}

.report-link:hover {
    color: var(--danger);
}

.report-target {
    padding: 16px;
    margin-bottom: 18px;
    background: var(--subtle);
    border: 1px solid var(--line);
    border-radius: 10px;
}

.report-target-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 12px;
}

.report-target-body {
    max-height: 180px;
    overflow: auto;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.report-note {
    margin: -4px 0 16px;
    color: var(--muted);
    font-size: 13px;
}

select {
    width: 100%;
    margin-top: 6px;
    padding: 11px 12px;
    border: 1px solid var(--input-border);
    border-radius: 9px;
    color: var(--text);
    background: var(--input);
    font: inherit;
}

select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.terms-content {
    padding: clamp(18px, 4vw, 32px);
    overflow-wrap: anywhere;
}

.terms-content h1 {
    margin-top: 0;
}

.terms-content h2 {
    margin: 28px 0 12px;
    font-size: 19px;
}

.terms-content ul {
    padding-left: 1.5em;
}

.terms-content li + li {
    margin-top: 8px;
}

.footer {
    padding: 30px 16px;
    border-top: 1px solid var(--line);
    text-align: center;
    color: var(--muted);
    font-size: 12px;
}

.footer-ad {
    text-align: center;
    margin: 16px 0;
}

@media (max-width: 640px) {
    .header-inner {
        width: min(760px, calc(100% - 20px));
        gap: 8px;
        padding: 8px 0;
    }

    .nav {
        gap: 8px;
        font-size: 13px;
    }

    .container {
        width: min(100% - 20px, 760px);
        margin-top: 18px;
    }

    .intro h1,
    .auth-card h1,
    .profile-card h1 {
        font-size: 23px;
    }

    .post {
        padding: 15px;
    }

    .post-head {
        display: block;
    }

    .post-meta {
        margin-top: 9px;
        margin-left: 50px;
    }

    .profile-top {
        align-items: flex-start;
        flex-wrap: wrap;
    }

    .profile-top .button-secondary {
        width: 100%;
        text-align: center;
    }

    .site-title {
        font-size: 17px;
    }
}


.post-number {
    color: var(--muted);
    text-decoration: none;
}

.post-number:hover {
    color: var(--accent);
    text-decoration: underline;
}

.seo-info {
    margin-top: 34px;
    padding: 20px;
}

.seo-info h2 {
    margin: 0 0 10px;
    font-size: 18px;
}

.seo-info p {
    margin: 8px 0 0;
    color: var(--content-text);
    font-size: 14px;
}

.footer a {
    color: inherit;
}

.thread-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 0 0 10px;
}

.thread-tags a {
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--reply-bg);
    font-size: 13px;
    overflow-wrap: anywhere;
}

.sort-tabs {
    flex-wrap: wrap;
}

.tag-cloud {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 12px 18px;
    list-style: none;
    padding: 22px;
    margin: 0;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}
.tag-cloud a { font-size: var(--tag-size); font-weight: 700; overflow-wrap: anywhere; }
.tag-cloud .muted { margin-left: 6px; font-size: 12px; white-space: nowrap; }

.thread-list {
    margin-bottom: 28px;
}

@media (max-width: 420px) {
    .header-inner { gap: 6px; }
    .site-title { font-size: 14px; }
    .theme-toggle { padding: 6px; font-size: 11px; }
    .nav { gap: 6px; font-size: 11px; }
    .nav-primary { padding: 6px 8px; }
}

.profile-meta > * { min-width: 0; overflow-wrap: anywhere; }

.thread-search-link { margin: 24px 0 0; text-align: center; }
.thread-search-link a { display: inline-block; }

.button-primary, .button-primary:hover { text-decoration: none; }