/*!
 * 吉他和弦可视化 /tools/guitarchord
 * 配色与设计复刻 Kepma 吉他和弦可视化（深色面板 + 木色指板 + 级数配色），
 * 并适配本站的明暗主题与三端断点。
 */
.gc-page {
    --gc-bg: #0d1117;
    --gc-panel: #161b22;
    --gc-panel2: #1c2128;
    --gc-line: #2d333b;
    --gc-line2: #3a424c;
    --gc-fg: #e6edf3;
    --gc-muted: #9198a1;
    --gc-accent: #4f9cff;
    --gc-accent2: #a371f7;
    /* 级数配色（7 色定性区分，彼此不邻近，便于盲读） */
    --gc-c-root: #ef4444;
    --gc-c-third: #f59e0b;
    --gc-c-fifth: #38bdf8;
    --gc-c-sev: #a855f7;
    --gc-c-ext: #22c55e;
    --gc-c-eleven: #06b6d4;
    --gc-c-thirteen: #ec4899;
    /* 统一圆角 / 阴影 / 强调描边，保证整页视觉语言一致 */
    --gc-radius: 14px;
    --gc-shadow: 0 8px 26px rgba(0, 0, 0, .30);
    --gc-ring: rgba(79, 156, 255, .30);

    background: var(--gc-bg);
    color: var(--gc-fg);
    min-height: 100vh;
    box-sizing: border-box;
}

/* 浅色主题（跟随站点 data-theme） */
[data-theme="light"] .gc-page {
    --gc-bg: #f5f7fa;
    --gc-panel: #ffffff;
    --gc-panel2: #eef2f6;
    --gc-line: #d8dee4;
    --gc-line2: #c2cad3;
    --gc-fg: #1f242c;
    --gc-muted: #5c6672;
    --gc-accent: #136ce9;
    --gc-accent2: #7a4dff;
    --gc-ring: rgba(19, 108, 233, .26);
    --gc-shadow: 0 8px 26px rgba(31, 36, 44, .10);
}

.gc-page *, .gc-page *::before, .gc-page *::after { box-sizing: border-box; }
.gc-page [hidden] { display: none !important; }

/* 键盘可达性：统一焦点描边 */
.gc-page .gc-btn:focus-visible,
.gc-page .gc-chip:focus-visible,
.gc-page .gc-seg__b:focus-visible,
.gc-page .gc-sel:focus-visible,
.gc-page .gc-tab:focus-visible,
.gc-page .gc-shape__play:focus-visible,
.gc-page .gc-toggle input:focus-visible {
    outline: 2px solid var(--gc-accent);
    outline-offset: 2px;
}

.gc-wrap { max-width: 1480px; margin: 0 auto; padding: 18px 20px 56px; }

/* ---------- 头部 ---------- */
.gc-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.gc-head__icon {
    width: 46px; height: 46px; flex: 0 0 46px; border-radius: 13px;
    background: linear-gradient(145deg, var(--gc-accent2), var(--gc-accent));
    color: #fff; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 6px 18px rgba(79, 156, 255, .28);
}
.gc-head__icon svg { width: 26px; height: 26px; }
.gc-head__txt { flex: 1 1 260px; min-width: 0; }
.gc-head__title { margin: 0; font-size: 22px; font-weight: 800; letter-spacing: .3px; }
.gc-head__sub { margin: 4px 0 0; font-size: 13px; color: var(--gc-muted); }
.gc-head__acts { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- 通用控件 ---------- */
.gc-btn {
    appearance: none; border: 1px solid var(--gc-line2); background: var(--gc-panel2);
    color: var(--gc-fg); border-radius: 10px; padding: 9px 14px; font-size: 13px;
    font-weight: 600; cursor: pointer; transition: .16s; white-space: nowrap;
}
.gc-btn:hover { border-color: var(--gc-accent); color: var(--gc-accent); }
.gc-btn--primary { background: var(--gc-accent); border-color: var(--gc-accent); color: #fff; }
.gc-btn--primary:hover { background: var(--gc-accent2); border-color: var(--gc-accent2); color: #fff; }
.gc-btn--sm { padding: 6px 10px; font-size: 12px; border-radius: 8px; }
.gc-btn.is-on { border-color: var(--gc-accent); color: var(--gc-accent); }

.gc-sel {
    background: var(--gc-panel2); color: var(--gc-fg); border: 1px solid var(--gc-line);
    border-radius: 9px; padding: 7px 9px; font-size: 13px; max-width: 100%;
}
.gc-sel:focus { outline: 2px solid var(--gc-accent); outline-offset: 1px; }

.gc-panel {
    background: var(--gc-panel); border: 1px solid var(--gc-line); border-radius: var(--gc-radius);
    padding: 16px 18px; display: grid; gap: 14px 16px; align-items: start;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
/* 每个控制分区做成独立小卡片，层次更清晰；调弦区占满整行（弦编辑器需要宽度） */
.gc-panel .gc-sec {
    background: var(--gc-panel2); border: 1px solid var(--gc-line);
    border-radius: 12px; padding: 12px 14px;
}
.gc-sec--tuning { grid-column: 1 / -1; }
.gc-sec { min-width: 0; }
.gc-sec--sub { margin-top: 18px; background: var(--gc-panel); border: 1px solid var(--gc-line); border-radius: 14px; padding: 12px 14px; }
.gc-sec__t { font-size: 12px; font-weight: 800; color: var(--gc-muted); letter-spacing: .4px; margin-bottom: 8px; }

.gc-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.gc-row--wrap { row-gap: 8px; }
.gc-flds { display: flex; gap: 10px; flex-wrap: wrap; }
.gc-fld { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--gc-muted); }
.gc-fld > span { white-space: nowrap; }
.gc-tip { margin-top: 8px; font-size: 12px; color: var(--gc-muted); line-height: 1.6; }

.gc-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.gc-chip {
    appearance: none; border: 1px solid var(--gc-line2); background: var(--gc-panel2);
    color: var(--gc-fg); border-radius: 9px; padding: 7px 11px; font-size: 13px;
    font-weight: 700; cursor: pointer; transition: .14s;
}
.gc-chip:hover { border-color: var(--gc-accent); }
.gc-chip.is-active { background: var(--gc-accent); border-color: var(--gc-accent); color: #fff; }

.gc-seg { display: inline-flex; border: 1px solid var(--gc-line2); border-radius: 10px; overflow: hidden; }
.gc-seg__b {
    appearance: none; border: 0; background: var(--gc-panel2); color: var(--gc-fg);
    padding: 8px 14px; font-size: 13px; font-weight: 700; cursor: pointer;
}
.gc-seg__b + .gc-seg__b { border-left: 1px solid var(--gc-line2); }
.gc-seg__b.is-active { background: var(--gc-accent); color: #fff; }
.gc-toggle { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--gc-muted); cursor: pointer; }

.gc-string-editor { margin-top: 10px; display: grid; gap: 6px; }
.gc-str { display: flex; align-items: center; gap: 6px; }
.gc-str__no { width: 34px; font-size: 12px; color: var(--gc-muted); }
.gc-str__note { min-width: 62px; }
.gc-str__oct { min-width: 52px; }
.gc-str__freq { width: 84px; }
.gc-str__hz { font-size: 11px; color: var(--gc-muted); }

/* ---------- 和弦信息 ---------- */
.gc-chord {
    margin-top: 16px; background: var(--gc-panel); border: 1px solid var(--gc-line);
    border-radius: var(--gc-radius); padding: 16px 18px;
    display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px;
}
.gc-chord__name {
    margin: 0; font-size: 32px; font-weight: 800; letter-spacing: .5px; line-height: 1.1;
    background: linear-gradient(135deg, var(--gc-fg) 30%, var(--gc-accent));
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: var(--gc-fg);
}
[data-theme="light"] .gc-chord__name { background: none; -webkit-text-fill-color: currentColor; color: var(--gc-fg); }
.gc-chord__notes { margin: 0; font-size: 14px; color: var(--gc-fg); font-weight: 600; }
.gc-mini { font-size: 11.5px; color: var(--gc-muted); margin-left: 4px; }
.gc-legend { margin-left: auto; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.gc-lg { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; color: var(--gc-muted); }
.gc-dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }

/* ---------- 指板 ---------- */
.gc-board { margin-top: 14px; }
.gc-fretwrap {
    background: linear-gradient(180deg, var(--gc-panel), var(--gc-panel2));
    border: 1px solid var(--gc-line); border-radius: var(--gc-radius);
    padding: 12px; overflow-x: auto;
}
.gc-fretwrap svg { display: block; }
.gc-fretwrap::-webkit-scrollbar { height: 8px; }
.gc-fretwrap::-webkit-scrollbar-thumb { background: var(--gc-line2); border-radius: 8px; }
.gc-fretwrap::-webkit-scrollbar-track { background: transparent; }
.gc-board__hint { margin-top: 8px; font-size: 12px; color: var(--gc-muted); line-height: 1.5; }
.scrollx { -webkit-overflow-scrolling: touch; }

/* ---------- 页签 ---------- */
.gc-tabs { margin-top: 18px; display: flex; gap: 6px; flex-wrap: wrap; border-bottom: 1px solid var(--gc-line); }
.gc-tab {
    appearance: none; border: 0; background: transparent; color: var(--gc-muted);
    padding: 10px 14px; font-size: 13.5px; font-weight: 700; cursor: pointer;
    border-bottom: 2px solid transparent;
}
.gc-tab.is-active { color: var(--gc-accent); border-bottom-color: var(--gc-accent); }
.gc-pane { padding-top: 14px; }
.gc-pane__head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.gc-count { font-size: 12.5px; font-weight: 800; color: var(--gc-accent); }

/* ---------- 按法 ---------- */
.gc-grid-shapes {
    display: grid; gap: 14px;
    grid-template-columns: repeat(auto-fill, minmax(172px, 1fr));
}
.gc-shape {
    position: relative; background: var(--gc-panel); border: 1px solid var(--gc-line);
    border-radius: 12px; padding: 8px 8px 10px; cursor: pointer; transition: .16s;
}
.gc-shape:hover { border-color: var(--gc-line2); transform: translateY(-2px); box-shadow: var(--gc-shadow); }
.gc-shape.is-sel { border-color: var(--gc-accent); box-shadow: 0 0 0 2px rgba(79, 156, 255, .28); }
.gc-shape__play {
    position: absolute; top: 6px; right: 6px; z-index: 2;
    appearance: none; border: 1px solid var(--gc-line2); background: var(--gc-panel2);
    color: var(--gc-fg); border-radius: 50%; width: 26px; height: 26px; font-size: 11px;
    cursor: pointer; line-height: 1;
}
.gc-shape__play:hover { border-color: var(--gc-accent); color: var(--gc-accent); }
.gc-shape__nm { text-align: center; margin-top: 6px; font-size: 14px; letter-spacing: 1px; }
.gc-shape__nm b { font-weight: 800; }
.gc-shape__tags { margin-top: 6px; display: flex; gap: 4px; flex-wrap: wrap; justify-content: center; }
.gc-shape__tags span {
    font-size: 10.5px; color: var(--gc-muted); background: var(--gc-panel2);
    border: 1px solid var(--gc-line); border-radius: 6px; padding: 2px 5px;
}
.gc-empty {
    background: var(--gc-panel); border: 1px dashed var(--gc-line2); border-radius: 12px;
    padding: 18px; text-align: center; color: var(--gc-muted); font-size: 13px;
}

/* ---------- 和弦进行 ---------- */
.gc-prog { margin-top: 12px; display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
.gc-prog__item {
    background: var(--gc-panel); border: 1px solid var(--gc-line); border-radius: 12px;
    padding: 10px; text-align: center;
}
.gc-prog__item.is-play { border-color: var(--gc-accent); box-shadow: 0 0 0 2px rgba(79, 156, 255, .25); }
.gc-prog__name { font-size: 16px; font-weight: 800; margin-bottom: 4px; }
.gc-prog__svg svg { max-width: 180px; margin: 0 auto; display: block; }
.gc-prog__acts { margin-top: 6px; display: flex; gap: 6px; justify-content: center; }

/* ---------- 速查库 ---------- */
.gc-grid-lib { margin-top: 12px; display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); }
.gc-lib__item {
    background: var(--gc-panel); border: 1px solid var(--gc-line); border-radius: 12px;
    padding: 8px 8px 10px; cursor: pointer; text-align: center; transition: .16s;
}
.gc-lib__item:hover { border-color: var(--gc-accent); transform: translateY(-2px); box-shadow: var(--gc-shadow); }
.gc-lib__name { font-size: 15px; font-weight: 800; }
.gc-lib__svg svg { max-width: 180px; margin: 0 auto; display: block; }
.gc-lib__meta { font-size: 11.5px; color: var(--gc-muted); margin-top: 4px; }

/* ---------- 说明 ---------- */
.gc-doc { background: var(--gc-panel); border: 1px solid var(--gc-line); border-radius: 14px; padding: 16px 18px; }
.gc-doc h3 { margin: 16px 0 8px; font-size: 15px; font-weight: 800; }
.gc-doc h3:first-child { margin-top: 0; }
.gc-doc p, .gc-doc li { font-size: 13.5px; line-height: 1.85; color: var(--gc-fg); }
.gc-doc ol { margin: 0; padding-left: 20px; }
.gc-inline-dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; margin: 0 3px -1px 6px; }
.gc-doc__chords { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.gc-doc__grp { background: var(--gc-panel2); border: 1px solid var(--gc-line); border-radius: 10px; padding: 8px 10px; }
.gc-doc__grp b { display: block; font-size: 12.5px; margin-bottom: 4px; }
.gc-doc__grp span { font-size: 12px; color: var(--gc-muted); }

/* ---------- 提示条 ---------- */
.gc-toast {
    position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
    background: rgba(20, 26, 34, .95); color: #fff; border: 1px solid var(--gc-line2);
    padding: 10px 16px; border-radius: 10px; font-size: 13px; z-index: 99999;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .35);
}

/* ---------- 响应式：桌面 / 平板 / 手机 ---------- */
/* 平板（700~1024）：控制面板两列，调弦区占满整行 */
@media (max-width: 1024px) and (min-width: 700px) {
    .gc-panel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .gc-sec--tuning { grid-column: 1 / -1; }
    .gc-wrap { padding: 16px 16px 48px; }
}
/* 平板及以下：外边距收敛 */
@media (max-width: 1024px) {
    .gc-wrap { padding: 16px 16px 48px; }
}
/* 手机（≤699）：控制面板单列，头部按钮 2×2，页签横滑，弦编辑器紧凑 */
@media (max-width: 699px) {
    .gc-panel { grid-template-columns: 1fr; }
    .gc-sec--tuning { grid-column: auto; }
    .gc-wrap { padding: 12px 12px 44px; }

    .gc-head { gap: 10px; }
    .gc-head__icon { width: 40px; height: 40px; flex: 0 0 40px; }
    .gc-head__icon svg { width: 22px; height: 22px; }
    .gc-head__title { font-size: 19px; }
    .gc-head__sub { font-size: 12px; }
    .gc-head__acts { width: 100%; margin-top: 2px; }
    .gc-head__acts .gc-btn--primary { flex: 1 1 100%; }
    .gc-head__acts .gc-btn { flex: 1 1 calc(50% - 4px); text-align: center; }

    .gc-sec__t { font-size: 11.5px; }
    .gc-flds { flex-direction: column; align-items: stretch; }
    .gc-fld { justify-content: space-between; }

    /* 弦编辑器：每行单行紧凑排布，整体可横向滚动兜底，避免挤压换行 */
    .gc-string-editor { overflow-x: auto; padding-bottom: 4px; }
    .gc-str { flex-wrap: nowrap; min-width: max-content; }
    .gc-str__no { width: 30px; font-size: 11.5px; }
    .gc-str__note { min-width: 50px; }
    .gc-str__oct { min-width: 42px; }
    .gc-str__freq { width: 66px; }
    .gc-str__hz { display: none; }

    /* 页签：单行横滑不换行，保持一屏可见 */
    .gc-tabs { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .gc-tab { white-space: nowrap; flex: 0 0 auto; padding: 10px 12px; font-size: 13px; }

    /* 按法 / 速查 / 进行：手机两列 */
    .gc-grid-shapes, .gc-grid-lib, .gc-prog { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .gc-shape, .gc-lib__item, .gc-prog__item { padding: 8px 6px 10px; }
    .gc-shape__nm, .gc-lib__name, .gc-prog__name { font-size: 14px; }

    /* iOS 聚焦缩放防护 */
    .gc-page select, .gc-page input { font-size: 16px; }
    .gc-chord__name { font-size: 27px; }
}
@media (max-width: 420px) {
    .gc-grid-shapes, .gc-grid-lib, .gc-prog { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .gc-chord__name { font-size: 24px; }
    .gc-shape__nm, .gc-lib__name, .gc-prog__name { font-size: 13px; }
    .gc-doc { padding: 14px; }
}
@media (prefers-reduced-motion: reduce) {
    .gc-page * { transition: none !important; }
}