/* 五度圈 /tools/circle —— 全屏工具（左侧导航保留，右侧栏由页面隐藏）
   设计原则：
   · 移动优先：基础样式 = 手机，逐级 min-width 增强（900 / 1200 / 1500）
   · 科学配色：圆环扇区底色深浅 = 该调升降号数量（离 C 越远越深），选中=主色，邻调/关系调用浅色层级
   · 8pt 间距节奏与统一圆角，卡片标题带主色竖条，信息层级：调名 > 调号 > 音阶/和弦 > 辅助说明
*/
.cof-page {
    --cof-gap: 16px;
    --cof-pad: 13px;
    --cof-radius: 14px;
    --cof-radius-sm: 10px;
    max-width: none;
    margin: 0;
    padding: 10px 12px 22px;
    box-sizing: border-box;
}

/* ==================== 顶部 ==================== */
.cof-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}
.cof-top-l { display: flex; align-items: center; gap: 10px; min-width: 0; }
.cof-logo {
    width: 40px; height: 40px; flex: 0 0 40px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; border-radius: 12px;
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 24%, var(--bg-secondary)), var(--bg-secondary));
    border: 1px solid var(--border-color);
}
.cof-top-t { min-width: 0; }
.cof-h1 { margin: 0; font-size: 18px; font-weight: 700; letter-spacing: .3px; line-height: 1.25; }
.cof-sub { display: none; }

/* ==================== 页签 ==================== */
.cof-tabs {
    display: flex; gap: 6px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px; margin-bottom: 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.cof-tabs::-webkit-scrollbar { display: none; }
.cof-tab {
    flex: 0 0 auto;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px; font-weight: 600;
    padding: 7px 12px; border-radius: 999px;
    cursor: pointer; font-family: inherit;
    white-space: nowrap;
}
.cof-tab:hover { color: var(--text-primary); background: var(--bg-secondary); }
.cof-tab.is-active { color: #fff; background: var(--accent); border-color: var(--accent); }

/* ==================== 主体布局 ==================== */
.cof-main { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; align-items: start; }

/* ----- 圆环卡 ----- */
.cof-ring-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--cof-radius);
    padding: 8px;
    box-sizing: border-box;
    min-width: 0;
}
.cof-ring-tools {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    margin-bottom: 6px;
}
.cof-ring-tip { display: none; }

.cof-seg {
    display: inline-flex; gap: 2px; padding: 2px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
}
.cof-seg-btn {
    border: 0; background: transparent; color: var(--text-secondary);
    font-size: 12.5px; font-weight: 600; font-family: inherit;
    padding: 6px 11px; border-radius: 999px; cursor: pointer;
    min-height: 32px;
}
.cof-seg-btn.is-active { background: var(--accent); color: #fff; }

.cof-select {
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 8px; padding: 7px 10px; font-size: 13px;
    font-family: inherit; outline: none; max-width: 100%;
    min-height: 34px;
}
.cof-select:focus { border-color: var(--accent); }

.cof-svg-wrap { display: block; }
#cofSvg { display: block; width: 100%; max-width: 520px; height: auto; margin: 0 auto; }

/* ----- SVG 圆环（字号随屏幕补偿，避免被等比缩放后过小） ----- */
.cof-sect { cursor: pointer; }
.cof-sect-path {
    fill: color-mix(in srgb, var(--accent) var(--cof-tint, 8%), var(--bg-primary));
    stroke: var(--border-color); stroke-width: 1;
    transition: fill .15s ease, stroke .15s ease;
}
.cof-sect:hover .cof-sect-path { fill: color-mix(in srgb, var(--accent) 26%, var(--bg-primary)); }
.cof-sect:focus { outline: none; }
.cof-sect:focus-visible .cof-sect-path { stroke: var(--accent); stroke-width: 2.5; }
/* SVG 圆环：字号 = 基准值 × --cof-k（JS 按实际渲染宽度补偿，缩小后仍保持可读） */
.cof-name {
    font-weight: 700; text-anchor: middle; dominant-baseline: central;
    pointer-events: none; font-size: calc(19px * var(--cof-k, 1));
}
/* 内圈（关系小调）环带更窄，字号相应小一号 —— 必须写在 .cof-name 之后覆盖，
   否则 SVG 上的 font-size 表现属性会被类规则统一成外圈的 19px，内外圈失去层级 */
.cof-sect[data-ring="minor"] .cof-name { font-size: calc(15px * var(--cof-k, 1)); }
.cof-subname {
    text-anchor: middle; dominant-baseline: central;
    pointer-events: none; opacity: .8; font-size: calc(10.5px * var(--cof-k, 1));
}
/* 选中 / 邻调 / 关系调：放在 hover 之后，同特异性后者生效 */
.cof-sect.is-near .cof-sect-path { fill: color-mix(in srgb, var(--accent) 30%, var(--bg-primary)); }
.cof-sect.is-rel .cof-sect-path { fill: color-mix(in srgb, var(--accent) 15%, var(--bg-primary)); }
.cof-sect.is-sel .cof-sect-path { fill: var(--accent); stroke: var(--accent); stroke-width: 1.5; }
.cof-sect.is-sel .cof-name { fill: #fff; }
.cof-sect.is-sel .cof-subname { fill: #fff; opacity: .92; }

.cof-center-bg {
    fill: color-mix(in srgb, var(--accent) 7%, var(--bg-primary));
    stroke: var(--border-color); stroke-width: 1;
}
.cof-c-name { text-anchor: middle; dominant-baseline: central; font-weight: 800; fill: var(--text-primary); font-size: calc(44px * var(--cof-k, 1)); }
.cof-c-mode { text-anchor: middle; dominant-baseline: central; font-weight: 600; fill: var(--accent); font-size: calc(14px * var(--cof-k, 1)); }
.cof-c-sig { text-anchor: middle; dominant-baseline: central; fill: var(--text-secondary); font-size: calc(13px * var(--cof-k, 1)); }
.cof-c-rel { text-anchor: middle; dominant-baseline: central; fill: var(--text-secondary); font-size: calc(12.5px * var(--cof-k, 1)); }
.cof-c-hint { text-anchor: middle; dominant-baseline: central; fill: var(--text-secondary); opacity: .75; font-size: calc(11.5px * var(--cof-k, 1)); }

.cof-legend {
    display: flex; flex-wrap: wrap; gap: 4px 12px;
    margin-top: 8px; padding-top: 9px;
    border-top: 1px dashed var(--border-color);
    font-size: 11.5px; color: var(--text-secondary);
}
.cof-lg { display: inline-flex; align-items: center; gap: 6px; }
.cof-lg::before {
    content: ''; width: 11px; height: 11px; border-radius: 3px;
    border: 1px solid var(--border-color); background: var(--bg-primary);
}
.cof-lg-maj::before { background: color-mix(in srgb, var(--accent) 20%, var(--bg-primary)); }
.cof-lg-min::before { background: color-mix(in srgb, var(--accent) 8%, var(--bg-primary)); }

/* ==================== 右侧信息栏 ==================== */
.cof-info { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; min-width: 0; }
.cof-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--cof-radius-sm);
    padding: 12px;
    box-sizing: border-box;
    min-width: 0;
}
.cof-card-t {
    display: flex; align-items: center; gap: 7px;
    font-size: 13.5px; font-weight: 700; margin-bottom: 9px;
}
.cof-card-t::before {
    content: ''; flex: 0 0 3px; width: 3px; height: 13px;
    border-radius: 2px; background: var(--accent);
}
.cof-hint { font-size: 12px; font-weight: 400; color: var(--text-secondary); }
.cof-sw {
    margin-left: auto; font-size: 12px; font-weight: 400; color: var(--text-secondary);
    cursor: pointer; display: inline-flex; align-items: center; gap: 5px;
}
.cof-sw input { accent-color: var(--accent); width: 15px; height: 15px; }

/* 当前调头卡：主色渐层 + 大号调名 */
.cof-keyhead {
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 16%, var(--bg-secondary)), var(--bg-secondary));
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border-color));
}
.cof-keyname { display: flex; align-items: baseline; gap: 9px; flex-wrap: wrap; }
.cof-kname { font-size: 27px; font-weight: 800; line-height: 1.1; letter-spacing: -.5px; }
.cof-kmode { font-size: 12.5px; font-weight: 600; color: var(--accent); }
.cof-ksig { margin-top: 5px; font-size: 12.5px; color: var(--text-secondary); line-height: 1.6; }
.cof-rels { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 9px; }

.cof-row { display: flex; flex-wrap: wrap; gap: 8px; }
.cof-row-inline { align-items: center; margin-top: 8px; }
.cof-lbl { font-size: 12.5px; color: var(--text-secondary); }

/* ==================== 通用控件 ==================== */
.cof-btn {
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 8px; padding: 8px 12px;
    font-size: 13px; font-weight: 600; font-family: inherit;
    cursor: pointer; min-height: 38px;
}
.cof-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.cof-btn:disabled { opacity: .5; cursor: default; }
.cof-btn:focus-visible, .cof-tab:focus-visible, .cof-chip:focus-visible, .cof-seg-btn:focus-visible {
    outline: 2px solid var(--accent); outline-offset: 2px;
}
.cof-btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.cof-btn-primary:hover:not(:disabled) { color: #fff; filter: brightness(1.06); }
.cof-btn-ghost { background: transparent; }
.cof-btn-sm { padding: 6px 10px; font-size: 12.5px; min-height: 34px; }

.cof-chip {
    display: inline-flex; align-items: center; gap: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 999px; padding: 6px 11px;
    font-size: 12.5px; cursor: pointer; font-family: inherit;
    color: var(--text-primary); min-height: 32px;
}
.cof-chip:hover { border-color: var(--accent); color: var(--accent); }
.cof-chip.is-on { background: var(--accent); border-color: var(--accent); color: #fff; }
.cof-chip b { font-size: 13px; }
.cof-chip small { opacity: .75; font-size: 11px; }

/* ----- 调号 ----- */
.cof-sig { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 9px; }
.cof-sig-item {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 34px; padding: 5px 8px;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border-color));
    border-radius: 8px;
    background: var(--bg-primary); font-size: 14px; font-weight: 700;
    color: var(--accent);
}
.cof-sig-none { font-size: 13px; color: var(--text-secondary); }
.cof-order { font-size: 12px; color: var(--text-secondary); line-height: 1.75; }
.cof-order b { color: var(--text-primary); }

/* ----- 音阶 ----- */
.cof-scale { display: flex; flex-wrap: wrap; gap: 7px; }
.cof-note {
    display: inline-flex; flex-direction: column; align-items: center; gap: 1px;
    min-width: 46px; padding: 7px 8px;
    border: 1px solid var(--border-color); border-radius: 9px;
    background: var(--bg-primary); cursor: pointer; font-family: inherit;
    color: var(--text-primary); min-height: 46px; justify-content: center;
}
.cof-note:hover { border-color: var(--accent); }
.cof-note b { font-size: 15px; font-weight: 700; }
.cof-note small { font-size: 10.5px; color: var(--text-secondary); }
.cof-note.is-tonic {
    background: color-mix(in srgb, var(--accent) 16%, var(--bg-primary));
    border-color: var(--accent);
}

/* ----- 和弦 ----- */
.cof-chords { display: flex; flex-wrap: wrap; gap: 7px; }
.cof-chord {
    display: inline-flex; flex-direction: column; align-items: flex-start; gap: 1px;
    padding: 7px 10px; min-width: 62px;
    border: 1px solid var(--border-color); border-radius: 9px;
    background: var(--bg-primary); cursor: pointer; font-family: inherit;
    color: var(--text-primary); min-height: 48px; justify-content: center;
}
.cof-chord:hover { border-color: var(--accent); }
.cof-chord b { font-size: 14.5px; font-weight: 700; }
.cof-chord small { font-size: 11px; color: var(--text-secondary); }
.cof-chord.is-tonic {
    background: color-mix(in srgb, var(--accent) 16%, var(--bg-primary));
    border-color: var(--accent);
}

/* ----- 虚拟键盘 ----- */
.cof-kb {
    position: relative; height: 92px; box-sizing: border-box;
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: 9px; padding: 6px;
}
.cof-kb-inner { position: relative; width: 100%; height: 100%; }
.cof-kb-white { display: flex; height: 100%; }
.cof-wkey {
    flex: 1 1 0; box-sizing: border-box; position: relative;
    background: #fcfcfd; border: 1px solid #c7ccd4; border-right-width: 0;
    border-radius: 0 0 4px 4px; cursor: pointer;
    display: flex; align-items: flex-end; justify-content: center;
    padding-bottom: 4px; font-size: 10px; color: #8a94a6; user-select: none;
}
.cof-wkey:last-child { border-right-width: 1px; }
.cof-wkey.is-on { background: color-mix(in srgb, var(--accent) 34%, #fff); color: #1b2430; font-weight: 700; }
.cof-bkeys { position: absolute; inset: 0 0 auto 0; height: 62%; pointer-events: none; }
.cof-bkey {
    position: absolute; top: 0; height: 100%;
    background: #2c313a; border-radius: 0 0 4px 4px; cursor: pointer; pointer-events: auto;
    user-select: none;
}
.cof-bkey.is-on { background: color-mix(in srgb, var(--accent) 62%, #2c313a); }
.cof-deg {
    position: absolute; top: 3px; left: 50%; transform: translateX(-50%);
    font-size: 9.5px; font-weight: 700; pointer-events: none;
}
.cof-wkey .cof-deg { color: var(--accent); }
.cof-bkey .cof-deg { color: #fff; opacity: .92; }

/* ==================== 文档 / 知识页 ==================== */
.cof-doc { display: flex; flex-direction: column; gap: 12px; max-width: 960px; margin: 0 auto; }
.cof-article {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--cof-radius-sm); padding: 13px 14px;
}
.cof-article h2 { margin: 0 0 8px; font-size: 17px; }
.cof-article h3 { margin: 0 0 8px; font-size: 15px; color: var(--accent); }
.cof-article p { margin: 0 0 8px; font-size: 14px; line-height: 1.85; color: var(--text-primary); }
.cof-article ul, .cof-article ol { margin: 0 0 8px; padding-left: 20px; font-size: 14px; line-height: 1.85; }
.cof-article li { margin-bottom: 3px; }
.cof-seq {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px; letter-spacing: .5px;
    background: var(--bg-primary); border: 1px dashed var(--border-color);
    border-radius: 8px; padding: 9px 11px; word-break: break-word; line-height: 1.7;
}
.cof-tip {
    background: color-mix(in srgb, var(--accent) 10%, var(--bg-primary));
    border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0;
    padding: 9px 12px !important;
}

.cof-table-card { margin-top: 2px; }
.cof-table-wrap { overflow-x: auto; }
.cof-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.cof-table th, .cof-table td {
    border-bottom: 1px solid var(--border-color);
    padding: 8px 10px; text-align: left; white-space: nowrap;
}
.cof-table th { color: var(--text-secondary); font-weight: 600; font-size: 12.5px; }
.cof-table tbody tr { cursor: pointer; transition: background .15s ease; }
.cof-table tbody tr.is-cur { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.cof-table tbody tr:hover { background: var(--bg-primary); }
.cof-table tbody tr.is-cur:hover { background: color-mix(in srgb, var(--accent) 16%, transparent); }
.cof-table td b { font-size: 14px; }

/* 和弦进行 */
.cof-progs { display: flex; flex-direction: column; gap: 8px; }
.cof-prog {
    display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
    border: 1px solid var(--border-color); border-radius: 9px;
    background: var(--bg-primary); padding: 9px 11px;
}
.cof-prog-l { min-width: 0; flex: 1 1 200px; }
.cof-prog-t { font-size: 13.5px; font-weight: 700; }
.cof-prog-c { font-size: 12.5px; color: var(--accent); margin-top: 2px; word-break: break-word; }
.cof-prog-d { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* 案例 */
.cof-cases { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.cof-case {
    background: var(--bg-secondary); border: 1px solid var(--border-color);
    border-radius: var(--cof-radius-sm); padding: 13px 14px;
}
.cof-case-h {
    display: flex; align-items: center; justify-content: space-between;
    gap: 10px; flex-wrap: wrap; margin-bottom: 7px;
}
.cof-case-n { font-size: 14px; font-weight: 700; }
.cof-case-ch {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px; color: var(--accent); margin: 0 0 6px !important;
}
.cof-case p { font-size: 13.5px; line-height: 1.8; margin: 0; }

.cof-foot { margin: 16px 0 0; font-size: 12px; color: var(--text-secondary); text-align: center; line-height: 1.7; }

/* Toast */
.cof-toast {
    position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%);
    max-width: calc(100% - 32px);
    background: rgba(20, 24, 32, .94); color: #fff;
    padding: 9px 16px; border-radius: 999px; font-size: 13px; text-align: center;
    z-index: 100000; box-shadow: 0 8px 26px rgba(0, 0, 0, .28);
}
.cof-toast[hidden] { display: none !important; }

/* ==================== 增强：小屏细节 ==================== */
@media (max-width: 480px) {
    .cof-page { padding: 8px 10px 20px; }
    .cof-top-r { width: 100%; }
    .cof-top-r .cof-btn { width: 100%; }
    .cof-ring-card { padding: 6px; }
    .cof-ring-tools { gap: 6px; }
    .cof-seg { width: 100%; }
    .cof-seg-btn { flex: 1; text-align: center; padding: 6px 8px; }
    .cof-select { width: 100%; }
    .cof-row .cof-btn { flex: 1 1 auto; }
    .cof-kb { height: 84px; }
    .cof-kname { font-size: 25px; }
    .cof-note { min-width: 44px; }
    .cof-chord { min-width: 58px; }
}

/* ==================== 增强：≥600px（大屏手机 / 小平板竖屏） ==================== */
@media (min-width: 600px) {
    .cof-scale .cof-note { min-width: 50px; }
    .cof-chord { min-width: 66px; }
    .cof-cases { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ==================== 增强：≥768px（平板） ==================== */
@media (min-width: 768px) {
    .cof-page { padding: 14px 18px 26px; }
    .cof-h1 { font-size: 21px; }
    .cof-sub { display: block; margin: 3px 0 0; font-size: 13px; color: var(--text-secondary); }
    .cof-logo { width: 46px; height: 46px; flex-basis: 46px; font-size: 26px; }
    .cof-tabs { flex-wrap: wrap; overflow: visible; padding-bottom: 8px; }
    .cof-tab { font-size: 13.5px; padding: 8px 14px; }
    .cof-main { gap: var(--cof-gap); }
    .cof-ring-card { padding: 12px; }
    #cofSvg { max-width: 560px; }
    .cof-ring-tools { margin-bottom: 8px; }
    .cof-ring-tip { display: inline; font-size: 12px; color: var(--text-secondary); margin-left: auto; }
    .cof-legend { font-size: 12px; gap: 6px 14px; }
    .cof-card { padding: var(--cof-pad); }
    .cof-kname { font-size: 30px; }
    .cof-kb { height: 104px; }
    .cof-article { padding: 14px 16px; }
    .cof-doc { gap: 14px; }
}

/* ==================== 增强：≥900px（信息区双列，圆环整幅） ==================== */
@media (min-width: 900px) {
    .cof-info { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .cof-keyhead { grid-column: 1 / -1; }
}

/* ==================== 增强：≥1200px（桌面：左圆环吸顶 + 右信息单列） ==================== */
@media (min-width: 1200px) {
    .cof-main { grid-template-columns: minmax(0, 1fr) minmax(360px, 410px); }
    .cof-ring-card { position: sticky; top: 14px; align-self: start; }
    .cof-info { grid-template-columns: minmax(0, 1fr); }
    .cof-keyhead { grid-column: auto; }
    .cof-doc { margin: 0; }
}

/* ==================== 增强：≥1500px（宽屏：圆环放大 + 信息双列仪表盘） ==================== */
@media (min-width: 1500px) {
    .cof-main { grid-template-columns: minmax(560px, 1fr) minmax(0, 1.28fr); }
    #cofSvg { max-width: 620px; }
    .cof-info { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .cof-keyhead { grid-column: 1 / -1; }
    .cof-card { padding: 14px 15px; }
    .cof-kname { font-size: 32px; }
    .cof-cases { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .cof-doc { max-width: 1100px; margin: 0 auto; }
}

/* ==================== 增强：≥1800px（超宽屏：圆环再放大，填满空间） ==================== */
@media (min-width: 1800px) {
    #cofSvg { max-width: 680px; }
    .cof-page { padding: 16px 24px 30px; }
}