/* ===== Design tokens ===== */
:root {
    --bg: #fbfbfc;
    --surface: #ffffff;
    --surface-2: #f2f3f6;
    --surface-3: #e9ebef;
    --border: #ececef;
    --border-strong: #dcdde2;
    --text: #14161a;
    --text-dim: #5a6472;
    --text-mute: #9096a2;
    --accent: #3b6ef5;
    --accent-hover: #315fdb;
    --accent-weak: #edf3ff;
    --accent-text: #2453cf;
    --star: #f5a623;
    --danger: #e5484d;
    --success: #2f9e60;
    --bg-danger: #fdecec;
    --bg-success: #e9f6ee;

    --r-sm: 8px;
    --r: 12px;
    --r-lg: 16px;
    --r-pill: 999px;

    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 24px;

    --shadow-sm: 0 1px 2px rgba(18, 22, 38, 0.05), 0 1px 3px rgba(18, 22, 38, 0.05);
    --shadow-md: 0 4px 14px rgba(18, 22, 38, 0.08), 0 14px 40px rgba(18, 22, 38, 0.10);

    --t-fast: 110ms;
    --t: 180ms;
    --ease: cubic-bezier(0.2, 0, 0, 1);

    --sidebar-w: 268px;
    --content-max: 680px;

    /* 記事本文の表示設定（JS が localStorage から上書き。既定は下記） */
    --read-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
        "Yu Gothic UI", "Noto Sans JP", sans-serif;
    --read-size: 13.5px;
    --read-lh: 1.75;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0c0e12;
        --surface: #15171c;
        --surface-2: #1d2026;
        --surface-3: #262a31;
        --border: #23262d;
        --border-strong: #333843;
        --text: #e9eaee;
        --text-dim: #9ba3af;
        --text-mute: #6a7280;
        --accent: #5c85ff;
        --accent-hover: #7599ff;
        --accent-weak: #172136;
        --accent-text: #a6c1ff;
        --star: #ffc046;
        --danger: #ff6369;
        --success: #4bbd80;
        --bg-danger: #2a1618;
        --bg-success: #12241a;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
        --shadow-md: 0 10px 34px rgba(0, 0, 0, 0.5);
    }
}

* { box-sizing: border-box; }

html { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--r-pill);
    border: 3px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--text-mute); }
.sidebar::-webkit-scrollbar-thumb { border-color: var(--surface); }

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
        "Yu Gothic UI", "Noto Sans JP", sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

h1, h2, h3 { letter-spacing: -0.012em; }

a { color: inherit; }

button,
input {
    font: inherit;
    color: inherit;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--r-sm);
}

/* tabindex="-1" のコンテナ（#content / #sidebar）は
   スキップリンクや JS からプログラム的に focus されるが、枠は出さない */
#content:focus,
#content:focus-visible,
#sidebar:focus,
#sidebar:focus-visible {
    outline: none;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid transparent;
    border-radius: var(--r-sm);
    font-size: 13px;
    font-weight: 550;
    cursor: pointer;
    transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
    white-space: nowrap;
}
.btn:active { transform: translateY(0.5px) scale(0.985); }

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 1px 2px rgba(18, 22, 38, 0.12);
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost {
    background: var(--surface);
    border-color: var(--border-strong);
    color: var(--text-dim);
}
.btn-ghost:hover { background: var(--surface-2); color: var(--text); border-color: var(--border-strong); }

.btn-block { width: 100%; }
.btn-sm { padding: 5px 11px; font-size: 12px; }

.icon-btn {
    border: none;
    background: none;
    color: var(--text-mute);
    cursor: pointer;
    padding: 3px 5px;
    border-radius: var(--r-sm);
    line-height: 1;
    transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn:active { transform: scale(0.9); }

/* ===== Layout ===== */
.layout {
    display: flex;
    align-items: flex-start;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 18px 14px 28px;
}

.sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    padding: 0 4px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.brand-mark {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    border-radius: 7px;
    box-shadow: 0 1px 3px rgba(59, 110, 245, 0.35);
    background:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cg fill='none' stroke='%23fff' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M4 9.5Q8 6.5 12 9.5T20 9.5'/%3E%3Cpath d='M7 15Q9.5 13 12 15T17 15' opacity='.6'/%3E%3C/g%3E%3C/svg%3E") center / contain no-repeat,
        linear-gradient(135deg, var(--accent), #8a5bff);
}

.sidebar-open,
.sidebar-close { display: none; }

/* ===== Add feed form ===== */
.add-feed-form {
    display: flex;
    flex-direction: column;
    gap: 7px;
    margin-bottom: 14px;
}

.add-feed-form input {
    width: 100%;
    padding: 9px 12px;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}
.add-feed-form input::placeholder { color: var(--text-mute); }
.add-feed-form input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--accent-weak);
}

.add-feed-row {
    display: flex;
    gap: 7px;
}
.add-feed-row input { flex: 1; min-width: 0; }

/* ===== OPML import / export ===== */
.opml-box {
    margin-bottom: 12px;
    font-size: 12px;
}
.opml-box > summary {
    cursor: pointer;
    color: var(--text-dim);
    padding: 2px 0;
    display: block;          /* list-item マーカーを消す */
    list-style: none;
}
.opml-box > summary::-webkit-details-marker { display: none; }
.opml-box > summary::marker { content: ""; }
.opml-box > summary::before { content: "▸ "; font-size: 10px; }
.opml-box[open] > summary::before { content: "▾ "; }
.opml-box > summary:hover { color: var(--text); }
.opml-form {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 8px 0 6px;
}
.opml-form input[type="file"] {
    width: 100%;
    font-size: 12px;
    color: var(--text-dim);
}
.opml-export {
    display: inline-block;
    color: var(--accent);
    text-decoration: none;
}
.opml-export:hover { text-decoration: underline; }

/* ===== 記事の表示設定 ===== */
.reading-box {
    margin-bottom: 12px;
    font-size: 12px;
}
.reading-box > summary {
    cursor: pointer;
    color: var(--text-dim);
    padding: 2px 0;
    display: block;
    list-style: none;
}
.reading-box > summary::-webkit-details-marker { display: none; }
.reading-box > summary::marker { content: ""; }
.reading-box > summary::before { content: "▸ "; font-size: 10px; }
.reading-box[open] > summary::before { content: "▾ "; }
.reading-box > summary:hover { color: var(--text); }
.reading-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-top: 8px;
    color: var(--text-dim);
}
.reading-row select {
    flex: 0 0 auto;
    min-width: 88px;
    padding: 4px 6px;
    font: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
}
.reading-row select:focus { outline: none; border-color: var(--accent); }
.reading-sample {
    margin: 10px 0 2px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    background: var(--surface);
    color: var(--text);
    font-family: var(--read-font);
    font-size: var(--read-size);
    line-height: var(--read-lh);
}

/* ===== Sidebar tools ===== */
.sidebar-tools {
    padding-bottom: 12px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--border);
}

.auto-refresh-info {
    margin: 7px 2px 10px;
    font-size: 11px;
    color: var(--text-mute);
}

.search-form {
    position: relative;
    display: flex;
    align-items: center;
}
.search-form input {
    width: 100%;
    padding: 7px 10px 7px 30px;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    transition: border-color var(--t-fast), background var(--t-fast);
}
.search-form input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--surface);
}
.ico-search {
    position: absolute;
    left: 10px;
    width: 13px;
    height: 13px;
    border: 1.6px solid var(--text-mute);
    border-radius: 50%;
    pointer-events: none;
}
.ico-search::after {
    content: "";
    position: absolute;
    top: 11px;
    left: 9px;
    width: 6px;
    height: 1.6px;
    background: var(--text-mute);
    transform: rotate(45deg);
}
.ico-refresh {
    width: 13px;
    height: 13px;
    border: 1.6px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    display: inline-block;
}

/* ===== Nav ===== */
.nav {
    display: flex;
    flex-direction: column;
    gap: 1px;
    margin: 14px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 8px 11px;
    border-radius: var(--r-sm);
    text-decoration: none;
    color: var(--text-dim);
    font-weight: 500;
    transition: background var(--t-fast), color var(--t-fast);
}
.nav-item > span:first-child { flex: 1; }
.nav-item:hover { background: var(--surface-2); color: var(--text); }
.nav-item.active {
    background: var(--accent-weak);
    color: var(--accent-text);
    font-weight: 600;
}
.nav-item .star { color: var(--star); font-size: 12px; }

.badge {
    min-width: 20px;
    padding: 1.5px 6px;
    text-align: center;
    font-size: 10.5px;
    font-weight: 650;
    border-radius: var(--r-pill);
    background: var(--accent);
    color: #fff;
    font-variant-numeric: tabular-nums;
}
.badge-soft { background: var(--surface-3); color: var(--text-dim); }
.nav-item.active .badge { background: var(--accent); color: #fff; }

/* ===== Nav sections (feeds / tags) ===== */
.nav-section { margin-top: 20px; }

.nav-heading {
    margin: 0 0 8px;
    padding: 0 11px;
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--text-mute);
}

.nav-cat-row {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 6px;
}

/* 左の三角＝一覧の開閉トグル */
.nav-cat-toggle {
    flex-shrink: 0;
    width: 24px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    background: var(--surface-2);
    font-size: 12px;
    line-height: 1;
    color: var(--text-dim);
    cursor: pointer;
    border-radius: var(--r-sm);
    transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}
.nav-cat-toggle:hover {
    color: var(--text);
    background: var(--surface);
    border-color: var(--border-strong);
}

/* カテゴリ名クリック＝そのカテゴリで記事を絞り込み */
.nav-cat {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    border-radius: var(--r-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    color: var(--text);
    transition: background var(--t-fast), color var(--t-fast);
}
.nav-cat:hover { background: var(--surface-2); }
.nav-cat.active {
    background: var(--accent-weak);
    color: var(--accent-text);
}
.nav-cat.active .nav-cat-name { letter-spacing: -0.005em; }
.nav-cat.active .badge-soft { background: var(--accent); color: #fff; }

.nav-cat-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-cat-feeds[hidden] { display: none; }
.nav-cat-row[hidden] { display: none !important; }

.feed-row {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 5px 8px 5px 22px;
    border-radius: var(--r-sm);
    transition: background var(--t-fast);
}
.feed-row:hover { background: var(--surface-2); }
.feed-row.active { background: var(--accent-weak); }

.feed-link {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-dim);
    font-size: 13px;
}
.feed-row.active .feed-link { color: var(--accent-text); font-weight: 600; }

.feed-mark {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.feed-icon {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    object-fit: contain;
    background: var(--surface-2);
}
.feed-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--dot, var(--text-mute));
}
.feed-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.feed-row .icon-btn { opacity: 0; transition: opacity var(--t-fast); }
.feed-row:hover .icon-btn,
.feed-row:focus-within .icon-btn { opacity: 1; }

/* category edit popover */
.feed-edit { position: relative; flex-shrink: 0; }
.feed-edit summary {
    list-style: none;
    cursor: pointer;
    color: var(--text-mute);
    font-size: 12px;
    padding: 2px 4px;
    border-radius: var(--r-sm);
    opacity: 0;
    transition: opacity var(--t-fast), background var(--t-fast);
}
.feed-row:hover .feed-edit summary,
.feed-edit[open] summary { opacity: 1; }
.feed-edit summary:hover { background: var(--surface-2); color: var(--text); }
.feed-edit summary::-webkit-details-marker { display: none; }
.feed-edit form {
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    z-index: 20;
    display: flex;
    gap: 5px;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--r);
    box-shadow: var(--shadow-md);
}
.feed-edit input {
    width: 128px;
    padding: 5px 8px;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    font-size: 12px;
}

/* ===== Tag cloud ===== */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 2px 8px;
}
.tag-pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    color: var(--text-dim);
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-pill);
    transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.tag-pill:hover { color: var(--text); border-color: var(--border-strong); }
.tag-pill.active {
    background: var(--accent-weak);
    color: var(--accent-text);
    font-weight: 600;
}
.tag-pill-count { font-size: 10.5px; color: var(--text-mute); font-variant-numeric: tabular-nums; }
.tag-pill.active .tag-pill-count { color: var(--accent-text); }

/* ===== Content ===== */
.content {
    flex: 1;
    min-width: 0;
    max-width: calc(var(--content-max) + 56px);
    margin: 0 auto;
    padding: 26px 28px 56px;
}

.content-head {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 9px;
    margin-bottom: 8px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

/* 並び順の切替（新しい順 / 古い順）— filled track + raised active pill */
.seg {
    display: inline-flex;
    gap: 2px;
    padding: 2px;
    background: var(--surface-2);
    border-radius: var(--r-pill);
    font-size: 11.5px;
}
.seg a {
    padding: 4px 12px;
    border-radius: var(--r-pill);
    color: var(--text-dim);
    text-decoration: none;
    white-space: nowrap;
    transition: background var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
}
.seg a:hover { color: var(--text); }
.seg a.on {
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}
.view-title {
    margin: 0;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.015em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.count-pill {
    padding: 1.5px 8px;
    font-size: 11px;
    font-weight: 650;
    color: var(--text-mute);
    background: var(--surface-2);
    border-radius: var(--r-pill);
    font-variant-numeric: tabular-nums;
}
.head-toggle {
    margin-left: auto;
    padding: 4px 11px;
    font-size: 11.5px;
    font-weight: 500;
    color: var(--text-dim);
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-pill);
    text-decoration: none;
    white-space: nowrap;
    transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}
.head-toggle:hover { color: var(--text); background: var(--surface-3); }
.head-toggle.on {
    background: var(--accent-weak);
    color: var(--accent-text);
    font-weight: 600;
}

.head-toggle + .clear-link { margin-left: 8px; }

.head-right { margin-left: auto; }
.head-right ~ .head-right { margin-left: 0; }  /* 2つ目以降は先頭にくっつけて右にまとめる */
.head-right .head-toggle { margin-left: 0; }
.head-right + .clear-link { margin-left: 8px; }
.head-right .head-toggle { cursor: pointer; }
.clear-link {
    margin-left: auto;
    font-size: 12px;
    color: var(--accent-text);
    text-decoration: none;
}
.clear-link:hover { text-decoration: underline; }

/* ===== Banners ===== */
.banner {
    padding: 11px 15px;
    border-radius: var(--r);
    margin: 14px 0;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid transparent;
}
.banner-error {
    background: var(--bg-danger);
    border-color: color-mix(in srgb, var(--danger) 30%, transparent);
    color: var(--danger);
}
.banner-notice {
    background: var(--bg-success);
    border-color: color-mix(in srgb, var(--success) 30%, transparent);
    color: var(--success);
}

/* ===== Article card (flat list row that raises into a card when expanded) ===== */
.card {
    position: relative;
    background: transparent;
    border: 1px solid transparent;
    border-bottom-color: var(--border);
    border-radius: 0;
    scroll-margin-top: 18px;   /* 展開時に上端へ寄せたとき少し余白を残す */
    transition: border-color var(--t), box-shadow var(--t), background var(--t-fast), margin var(--t) var(--ease);
}
.card + .card { margin-top: 0; }
.card:last-child { border-bottom-color: transparent; }

/* 選択行 = 全幅の淡いハイライトのみ（枠で囲わない） */
.card.is-cursor { background: var(--accent-weak); }
/* 展開 = そのままインラインで開く（カード化しない）。ごく薄い地色で少しだけ浮かせる */
.card.is-open { background: var(--surface-2); }
.card.is-open.is-cursor { background: var(--accent-weak); }
/* 既読は少し沈める（展開時とカーソル時は除く） */
.card.is-read:not(.is-open):not(.is-cursor) { opacity: 0.6; }
.card.is-read:not(.is-open):not(.is-cursor):hover { opacity: 1; }

/* collapsed row — always visible, one line */
.card-row {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 12px 14px;
    background: none;
    border: none;
    border-radius: 0;
    font: inherit;
    color: inherit;
    text-align: left;
    cursor: pointer;
    transition: background var(--t-fast);
}
.card:not(.is-cursor):not(.is-open) .card-row:hover { background: var(--surface-2); }
.card.is-open .card-row { background: transparent; }
/* キーボード選択は .is-cursor の背景で示す。行の focus 枠は出さない */
.card-row:focus,
.card-row:focus-visible { outline: none; }

.card-row-mark {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.card-row-icon {
    width: 17px;
    height: 17px;
    border-radius: 5px;
    object-fit: contain;
    background: var(--surface-2);
}
.card.is-read .card-row-icon { opacity: 0.5; filter: grayscale(0.5); }

.card-row-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--dot, var(--accent));
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--dot, var(--accent)) 18%, transparent);
    transition: background var(--t-fast), box-shadow var(--t-fast);
}
.card.is-read .card-row-dot {
    width: 6px;
    height: 6px;
    background: transparent;
    box-shadow: inset 0 0 0 1.5px var(--border-strong);
}

.card-row-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: var(--read-font);
    font-size: 15.5px;
    font-weight: 700;
    letter-spacing: -0.012em;
    line-height: 1.35;
    color: var(--text);
}
.card.is-read .card-row-title { font-weight: 400; color: var(--text-dim); }

.card-row-star { flex-shrink: 0; color: var(--star); font-size: 11px; }

.card-row-right {
    flex-shrink: 0;
    display: flex;
    align-items: baseline;
    gap: 10px;
}
.card-row-feed {
    width: 96px;
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 10.5px;
    color: var(--text-mute);
}
.card-row-date {
    width: 36px;
    text-align: right;
    font-size: 10.5px;
    color: var(--text-mute);
    font-variant-numeric: tabular-nums;
}

/* expanded */
.card.is-open .card-row {
    align-items: flex-start;
    padding-top: 15px;
    padding-bottom: 4px;
}
.card.is-open .card-row-mark { margin-top: 4px; }
.card.is-open .card-row-title {
    white-space: normal;
    overflow: visible;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -0.021em;
    line-height: 1.32;
    color: var(--text);
}
.card.is-open .card-row-right,
.card.is-open .card-row-star { display: none; }

.card-body {
    display: none;
    padding: 2px 24px 18px 44px;
}
.card.is-open .card-body {
    display: block;
    animation: cardBodyIn var(--t) var(--ease);
}
@keyframes cardBodyIn {
    from { opacity: 0; transform: translateY(-3px); }
    to { opacity: 1; transform: none; }
}

/* byline: feed · date, shown under the title */
.card-meta {
    margin: 4px 0 14px;
    font-size: 11.5px;
    color: var(--text-mute);
    display: flex;
    align-items: center;
    gap: 7px;
}
.meta-feed {
    font-weight: 600;
    color: var(--text-dim);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 55%;
}
.meta-dot { opacity: 0.5; }

.card-excerpt {
    margin: 0;
    font-family: var(--read-font);
    font-size: 12.5px;
    line-height: 1.65;
    color: var(--text-dim);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.card.is-read .card-excerpt { opacity: 0.7; }

/* ===== AI要約 ===== */
.card-ai-summary {
    margin: 2px 0 16px;
    padding: 11px 14px;
    background: var(--accent-weak);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
    border-radius: var(--r-sm);
}
.card-ai-summary[hidden] { display: none; }
.card-ai-summary.is-error {
    background: var(--bg-danger);
    border-color: color-mix(in srgb, var(--danger) 30%, transparent);
}
.ai-summary-head {
    margin-bottom: 6px;
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-text);
}
.card-ai-summary.is-error .ai-summary-head { color: var(--danger); }
.ai-summary-body {
    white-space: pre-wrap;
    font-family: var(--read-font);
    font-size: 15px;
    line-height: 1.8;
    color: var(--text);
}
.js-summarize.on,
.js-fulltext.on {
    background: var(--accent-weak);
    border-color: color-mix(in srgb, var(--accent) 30%, transparent);
    color: var(--accent-text);
}

/* ===== 元記事の全文表示 ===== */
.card-feedbody[hidden],
.card-fulltext[hidden] { display: none; }
.fulltext-error {
    margin: 0;
    padding: 10px 12px;
    font-size: 12.5px;
    color: var(--danger);
    background: var(--bg-danger);
    border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
    border-radius: var(--r-sm);
}

/* ===== 展開時の記事本文(サニタイズ済みフィードHTML) ===== */
.card-content {
    font-family: var(--read-font);
    font-size: var(--read-size);
    line-height: var(--read-lh);
    color: var(--text);
    overflow-wrap: break-word;
}
.card.is-read .card-content { color: var(--text-dim); }
.card-content > :first-child { margin-top: 0; }
.card-content > :last-child { margin-bottom: 0; }
.card-content p,
.card-content ul,
.card-content ol,
.card-content blockquote,
.card-content table,
.card-content figure,
.card-content pre { margin: 0 0 0.9em; }
.card-content h1,
.card-content h2,
.card-content h3,
.card-content h4 {
    margin: 1.4em 0 0.5em;
    line-height: 1.35;
}
.card-content h1 { font-size: 1.3em; }
.card-content h2 { font-size: 1.18em; }
.card-content h3 { font-size: 1.06em; }
.card-content h4 { font-size: 1em; }
.card-content a {
    color: var(--accent-text);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.card-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--r-sm);
    margin: 0.5em 0;
    background: var(--surface-2);
}
.card-content ul,
.card-content ol { padding-left: 1.5em; }
.card-content li { margin: 0.2em 0; }
.card-content blockquote {
    border-left: 3px solid var(--border-strong);
    padding-left: 12px;
    color: var(--text-dim);
}
.card-content code,
.card-content pre {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans Mono CJK JP", monospace;
}
.card-content code {
    background: var(--surface-2);
    padding: 1px 5px;
    border-radius: 4px;
    font-size: 0.9em;
}
.card-content pre {
    background: var(--surface-2);
    padding: 12px 14px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 12px;
    line-height: 1.55;
}
.card-content pre code { background: none; padding: 0; font-size: inherit; }
.card-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.2em 0;
}
.card-content table {
    border-collapse: collapse;
    display: block;
    overflow-x: auto;
    font-size: 12.5px;
}
.card-content th,
.card-content td {
    border: 1px solid var(--border);
    padding: 5px 9px;
    text-align: left;
}
.card-content figcaption {
    font-size: 11.5px;
    color: var(--text-mute);
    margin-top: 0.3em;
}

/* tags */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
}
.chip {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px 4px 2px 9px;
    font-size: 11px;
    background: var(--surface-2);
    border-radius: var(--r-pill);
}
.chip a { text-decoration: none; color: var(--text-dim); }
.chip a:hover { color: var(--text); }
.chip button {
    border: none;
    background: none;
    color: var(--text-mute);
    cursor: pointer;
    font-size: 12px;
    padding: 0 2px;
    line-height: 1;
    border-radius: 50%;
    transition: color var(--t-fast);
}
.chip button:hover { color: var(--danger); }

.add-tag-form { display: inline-flex; }
.add-tag-form input {
    width: 82px;
    padding: 3px 9px;
    font-size: 11px;
    color: var(--text);
    background: transparent;
    border: 1px dashed var(--border-strong);
    border-radius: var(--r-pill);
    transition: width var(--t-fast), border-color var(--t-fast);
}
.add-tag-form input:focus {
    outline: none;
    width: 118px;
    border-style: solid;
    border-color: var(--accent);
}

/* actions */
.card-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}
.card-actions-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}
.open-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--accent-text);
    background: var(--accent-weak);
    border-radius: var(--r-sm);
    text-decoration: none;
    transition: background var(--t-fast);
}
.open-link:hover { background: color-mix(in srgb, var(--accent) 16%, transparent); }
.open-link span { font-size: 10.5px; }

.star-btn { font-size: 16px; color: var(--text-mute); }
.star-btn.on { color: var(--star); }
.star-btn:hover { color: var(--star); }

.raindrop-badge {
    font-size: 12px;
    color: var(--accent-text);
    cursor: default;
}

.js-read-toggle { min-width: 74px; }

/* ===== Empty state ===== */
.empty-state {
    text-align: center;
    padding: 72px 24px;
    color: var(--text-dim);
    font-size: 14.5px;
}
.empty-state p { margin: 0 0 6px; }
.empty-sub { font-size: 12.5px; color: var(--text-mute); }
.empty-sub a { color: var(--accent-text); font-weight: 500; }

/* ===== Inline form reset ===== */
.inline-form { display: inline; margin: 0; }

/* ===== Login ===== */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.login-card {
    width: 100%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 26px 24px 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-md);
}
.login-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 8px;
}
.login-label {
    font-size: 12px;
    color: var(--text-dim);
}
.login-input {
    width: 100%;
    padding: 9px 11px;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
}
.login-input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--surface);
}
.login-error {
    margin: 0;
    font-size: 12.5px;
    color: var(--danger);
}
.login-card .btn-block { margin-top: 4px; }

/* 新着通知トグル */
.sidebar-foot-line { margin: 16px 8px 0; }
.push-toggle {
    width: 100%;
    padding: 7px 10px;
    font-size: 12px;
    text-align: left;
    color: var(--text-dim);
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: color var(--t-fast), border-color var(--t-fast);
}
.push-toggle:hover { color: var(--text); border-color: var(--border-strong); }
.push-toggle.on {
    background: var(--accent-weak);
    color: var(--accent-text);
    font-weight: 600;
}
.push-toggle[disabled] { opacity: 0.6; cursor: default; }

/* サイドバーのログアウト */
.logout-line {
    margin: 10px 8px 0;
}
.logout-line button {
    border: none;
    background: none;
    padding: 0;
    font: inherit;
    font-size: 11px;
    color: var(--text-mute);
    cursor: pointer;
}
.logout-line button:hover { color: var(--text); text-decoration: underline; }

/* ===== Keyboard: skip link ===== */
.skip-link {
    position: fixed;
    top: 8px;
    left: 8px;
    z-index: 100;
    padding: 8px 14px;
    background: var(--accent);
    color: #fff;
    border-radius: var(--r-sm);
    text-decoration: none;
    font-size: 13px;
    transform: translateY(-160%);
    transition: transform var(--t) var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); outline-offset: 3px; }

/* ===== Keyboard: shortcut hint + help dialog ===== */
kbd {
    display: inline-block;
    min-width: 18px;
    padding: 1px 6px;
    font: inherit;
    font-size: 11px;
    text-align: center;
    color: var(--text);
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    border-bottom-width: 2px;
    border-radius: 5px;
}

.kbd-hint {
    margin: 18px 8px 0;
    font-size: 11px;
    color: var(--text-mute);
}

.kbd-help {
    position: fixed;
    inset: 0;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(10, 12, 18, 0.5);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    animation: fadeIn var(--t-fast) var(--ease);
}
.kbd-help[hidden] { display: none; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.kbd-help-panel {
    width: 100%;
    max-width: 380px;
    padding: 22px 24px;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-md);
    animation: cardBodyIn var(--t) var(--ease);
}
.kbd-help-panel h3 { margin: 0 0 14px; font-size: 15px; }
.kbd-help-panel dl { margin: 0 0 16px; }
.kbd-help-panel dl > div {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 5px 0;
    border-top: 1px solid var(--border);
    font-size: 13px;
}
.kbd-help-panel dl > div:first-child { border-top: none; }
.kbd-help-panel dt { flex: 0 0 96px; display: flex; gap: 4px; }
.kbd-help-panel dd { margin: 0; color: var(--text-dim); }

/* ===== Responsive: sidebar becomes a drawer ===== */
.nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 40;
    background: rgba(0, 0, 0, 0.45);
    animation: fadeIn var(--t-fast) var(--ease);
}
.nav-backdrop[hidden] { display: none; }

@media (max-width: 860px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        z-index: 50;
        transform: translateX(-100%);
        transition: transform var(--t) var(--ease);
        box-shadow: var(--shadow-md);
    }
    body.nav-open .sidebar { transform: translateX(0); }
    body.nav-open { overflow: hidden; }

    .sidebar-open {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 34px;
        height: 34px;
        border-radius: var(--r-sm);
        background: var(--surface);
        border: 1px solid var(--border-strong);
        color: inherit;
        cursor: pointer;
        font-size: 15px;
        flex-shrink: 0;
    }
    .sidebar-close {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 28px;
        height: 28px;
        font-size: 18px;
        color: var(--text-mute);
        background: none;
        border: none;
        cursor: pointer;
    }
    .content { padding: 16px 16px 40px; }
}

@media (max-width: 520px) {
    .card-row { padding: 9px 11px; gap: 8px; }
    .card-row-feed { display: none; }
    .card-row-right { gap: 0; }
    .card-body { padding: 0 12px 12px 35px; }
    .card.is-open .card-row-title { font-size: 17px; }
    .view-title { font-size: 15.5px; }
}

/* ===================================================================
   フォーカスモード — 記事を開くと本文だけを大きく表示し、一覧を隠す（feedly 風）
   有効化: index.html の JS が body に .focus-mode を付与（開いている記事があるとき）
   ロールバック:
     - 丸ごと戻す  → static/style.css.pre-focusmode / templates/index.html.pre-focusmode
     - CSS だけ外す → このブロックを削除（index.html 側は無害なので残しても可）
     - 一時的に無効 → index.html の `var FOCUS_MODE = true;` を false に
   =================================================================== */
body.focus-mode .card:not(.is-open) { display: none; }

body.focus-mode .content { max-width: calc(var(--content-max) + 120px); }

body.focus-mode .card.is-open {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-md);
    margin-top: 12px;
    scroll-margin-top: 8px;
    min-height: calc(100vh - 120px);   /* 短い記事でも一覧が覗かないように画面を埋める */
    overflow: clip;                    /* clip はスクロールコンテナを作らない = sticky が効く */
}

/* タイトル行を上端に固定。記事内をスクロールしても見出しと「×」が残る */
body.focus-mode .card.is-open .card-row {
    position: sticky;
    top: 0;
    z-index: 3;
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--border);
    padding: 18px 56px 14px 28px;
}
body.focus-mode .card.is-open .card-row-title {
    font-size: 23px;
    line-height: 1.3;
}

/* 右上「×」= 行クリック（行全体がボタン）または Esc で一覧に戻る */
body.focus-mode .card.is-open .card-row::after {
    content: "×";
    position: absolute;
    top: 12px;
    right: 16px;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    line-height: 1;
    color: var(--text-mute);
    background: var(--surface-2);
    border-radius: 50%;
    transition: color var(--t-fast), background var(--t-fast);
}
body.focus-mode .card.is-open .card-row:hover::after {
    color: var(--text);
    background: var(--surface-3);
}

/* 本文を flex 縦並びにして order で操作バーをタイトル(メタ)直下へ引き上げる。
   DOM 順は meta → content → tags → actions。表示順を meta → actions → content → tags に。 */
body.focus-mode .card.is-open .card-body {
    display: flex;
    flex-direction: column;
    padding: 20px 32px 44px;
}
body.focus-mode .card.is-open .card-actions {
    order: 1;
    margin: 2px 0 22px;
    padding: 0 0 16px;
    border-top: none;
    border-bottom: 1px solid var(--border);
}
body.focus-mode .card.is-open .card-ai-summary { order: 2; margin-top: 0; padding: 14px 16px; }
body.focus-mode .card.is-open .ai-summary-body { font-size: 16.5px; line-height: 1.85; }
body.focus-mode .card.is-open .card-content,
body.focus-mode .card.is-open .card-excerpt { order: 3; min-width: 0; }
body.focus-mode .card.is-open .card-tags { order: 4; margin-top: 20px; }

@media (max-width: 520px) {
    body.focus-mode .content { max-width: none; }
    body.focus-mode .card.is-open { border-radius: var(--r); margin-top: 8px; }
    body.focus-mode .card.is-open .card-row { padding: 14px 46px 12px 14px; }
    body.focus-mode .card.is-open .card-row-title { font-size: 19px; }
    body.focus-mode .card.is-open .card-body { padding: 16px 14px 32px; }
}