/* 智能扫描 /tools/scan —— 三端排版与配色
 *
 * 排版策略（改动前请先读，避免回退）：
 *  · 桌面 ≥1000px：遵循站点「工具箱默认占满电脑端屏幕」规范，容器不限宽。
 *    左栏是取景区（可拖四角），右栏是固定宽度的控制面板——面板不做成随视口
 *    无限变宽（2560px 下会到近 1000px，控件被拉散），而是夹在 330~380px。
 *    面板吸顶，但偏移量必须避开站点吸顶的 .page-header，由 JS 量出实际高度
 *    写入 --sc-stick（见 scan.js syncStickOffset）。
 *  · 平板 680-999px：两栏回落单列，控制面板改两列并排，减少纵向滚动。
 *  · 手机 ≤680px：单列、按钮整行铺满、触控区 ≥44px、输入 16px 防 iOS 缩放。
 *    已有页面后拖拽区自动收窄为一条紧凑栏，避免占掉半屏。
 *  · ≤420px：模式按钮单列、间距与圆角收紧。
 *
 * 配色：全部走站点主题变量，自动适配日间 / 夜间；强调色只用于主操作与选中态，
 *      卡片用 1px 边框 + 极淡阴影做层次，不与左侧导航抢注意力。
 */

.sc-page {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 24px clamp(16px, 2.4vw, 40px) 64px;
    box-sizing: border-box;
}

/* ---------- Hero ---------- */
.sc-hero {
    text-align: center;
    padding: 4px 0 clamp(18px, 2.6vw, 28px);
}
.sc-hero-ico {
    width: clamp(46px, 5vw, 58px);
    height: clamp(46px, 5vw, 58px);
    margin: 0 auto 12px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(23px, 2.6vw, 29px);
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.sc-hero h1 {
    margin: 0 0 8px;
    font-size: clamp(21px, 2.4vw, 28px);
    font-weight: 700;
    letter-spacing: .4px;
    line-height: 1.3;
}
.sc-hero-sub {
    margin: 0 auto;
    max-width: 760px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* ---------- 拖拽 / 选择区 ---------- */
.sc-drop {
    border: 2px dashed var(--border);
    border-radius: 18px;
    background: var(--bg-secondary);
    padding: clamp(26px, 4.5vw, 46px) 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color .18s ease, background .18s ease, padding .18s ease;
}
.sc-drop:hover,
.sc-drop.is-over {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--bg-secondary));
}
.sc-drop:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sc-drop-ico { font-size: clamp(32px, 4vw, 40px); line-height: 1; margin-bottom: 12px; opacity: .85; }
.sc-drop-t { margin: 0 0 8px; font-size: 16px; font-weight: 600; }
.sc-drop-link { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.sc-drop-s { margin: 4px 0 0; font-size: 13px; color: var(--text-secondary); }

/* 已有页面后收窄为紧凑条：省下的空间留给取景区 */
.sc-page.has-pages .sc-drop {
    display: flex;
    align-items: center;
    gap: 14px;
    text-align: left;
    padding: 13px 18px;
    border-radius: 14px;
}
.sc-page.has-pages .sc-drop-ico { margin: 0; font-size: 24px; flex: 0 0 auto; }
.sc-page.has-pages .sc-drop-t { margin: 0; font-size: 14.5px; }
.sc-page.has-pages .sc-drop-s { display: none; }

/* ---------- 多页条 ---------- */
.sc-pages {
    margin-top: 14px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-secondary);
}
.sc-pages[hidden] { display: none !important; }
.sc-pages-h {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}
.sc-pages-t { font-size: 14px; font-weight: 700; }
.sc-pages-c { font-size: 12.5px; color: var(--text-secondary); }
.sc-pages-acts { margin-left: auto; display: flex; gap: 8px; }
.sc-thumbs {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 4px;
}
.sc-thumb {
    position: relative;
    flex: 0 0 auto;
    width: 84px;
    border: 2px solid transparent;
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-primary);
    cursor: pointer;
    padding: 0;
    line-height: 0;
    transition: border-color .15s ease, transform .12s ease;
}
.sc-thumb:hover { transform: translateY(-2px); }
.sc-thumb.is-on { border-color: var(--accent); }
.sc-thumb:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sc-thumb img { width: 100%; height: 84px; object-fit: cover; display: block; }
.sc-thumb-i {
    position: absolute;
    left: 0;
    bottom: 0;
    right: 0;
    background: rgba(0, 0, 0, .55);
    color: #fff;
    font-size: 11px;
    line-height: 1.5;
    text-align: center;
}

/* ---------- 工作台 ---------- */
.sc-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 16px;
}
.sc-stage,
.sc-panel { min-width: 0; }
.sc-panel { display: flex; flex-direction: column; gap: 14px; }

.sc-stage {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-secondary);
    padding: 14px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
}
.sc-stage-h {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.sc-stage-acts { display: flex; gap: 8px; flex-wrap: wrap; }
.sc-canvas-wrap {
    position: relative;
    border-radius: 12px;
    background:
        repeating-conic-gradient(color-mix(in srgb, var(--text-primary) 7%, transparent) 0% 25%, transparent 0% 50%) 50% / 18px 18px,
        var(--bg-primary);
    border: 1px solid var(--border);
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.sc-canvas {
    max-width: 100%;
    max-height: min(62vh, 640px);
    display: block;
    touch-action: none;   /* 拖四角时不要触发页面滚动 */
}
.sc-hint {
    position: absolute;
    margin: 0;
    padding: 0 16px;
    font-size: 14px;
    color: var(--text-secondary);
    pointer-events: none;
}
.sc-hint[hidden] { display: none !important; }
.sc-stage-tip {
    margin: 10px 0 0;
    font-size: 12.5px;
    color: var(--text-secondary);
    min-height: 18px;
}

/* ---------- 分段控件 ---------- */
.sc-seg {
    display: inline-flex;
    padding: 3px;
    border: 1px solid var(--border);
    border-radius: 11px;
    background: var(--bg-primary);
}
.sc-seg-btn {
    border: 0;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    padding: 7px 14px;
    font-size: 13.5px;
    font-family: inherit;
    cursor: pointer;
    min-height: 34px;
    transition: background .15s ease, color .15s ease;
}
.sc-seg-btn.is-on { background: var(--accent); color: #fff; font-weight: 600; }
.sc-seg-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sc-seg-sm .sc-seg-btn { padding: 6px 12px; font-size: 13px; min-height: 32px; }

/* ---------- 卡片 / 面板 ---------- */
.sc-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-secondary);
    padding: 14px 16px 16px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
}
.sc-card-h { margin-bottom: 12px; }
.sc-card-h h2 { margin: 0; font-size: 15px; font-weight: 700; }
.sc-card-note { margin: 10px 0 0; font-size: 12.5px; color: var(--text-secondary); }

.sc-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
    gap: 9px;
}
.sc-mode {
    display: flex;
    flex-direction: column;
    gap: 2px;
    align-items: flex-start;
    text-align: left;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 9px 12px;
    cursor: pointer;
    font-family: inherit;
    min-height: 52px;
    justify-content: center;
    transition: border-color .15s ease, background .15s ease;
}
.sc-mode b { font-size: 13.5px; font-weight: 600; color: var(--text-primary); }
.sc-mode span { font-size: 11.5px; color: var(--text-secondary); }
.sc-mode:hover { border-color: var(--accent); }
.sc-mode.is-on { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--bg-primary)); }
.sc-mode.is-on b { color: var(--accent); }
.sc-mode:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.sc-switches { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.sc-sw {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 13.5px;
    cursor: pointer;
    min-height: 34px;
}
.sc-sw input[type="checkbox"] { width: 17px; height: 17px; accent-color: var(--accent); }

.sc-field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}
.sc-field:last-child { margin-bottom: 0; }
.sc-field-l { font-size: 13.5px; color: var(--text-secondary); }

.sc-exports { display: flex; flex-direction: column; gap: 9px; }

/* ---------- 按钮 ---------- */
.sc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 9px 16px;
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    transition: border-color .15s ease, color .15s ease, filter .15s ease;
}
.sc-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.sc-btn:active:not(:disabled) { transform: translateY(1px); }
.sc-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sc-btn:disabled { opacity: .5; cursor: not-allowed; }
.sc-btn-sm { min-height: 34px; padding: 6px 13px; font-size: 13px; }
.sc-btn-pri { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.sc-btn-pri:hover:not(:disabled) { filter: brightness(1.08); color: #fff; }
.sc-btn-danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.sc-btn-danger:hover:not(:disabled) { border-color: var(--danger); color: var(--danger); }

/* ---------- 说明 / 关于 ---------- */
.sc-help,
.sc-about {
    max-width: 940px;
    margin-left: auto;
    margin-right: auto;
}
.sc-help {
    margin-top: 18px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-secondary);
    padding: 14px 18px;
}
.sc-help > summary { cursor: pointer; font-size: 15px; font-weight: 700; list-style: none; }
.sc-help > summary::-webkit-details-marker { display: none; }
.sc-help > summary::before { content: '▾ '; color: var(--accent); }
.sc-help[open] > summary::before { content: '▴ '; }
.sc-help-ol { margin: 12px 0 0; padding-left: 22px; font-size: 14px; line-height: 1.9; }
.sc-tip {
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background: color-mix(in srgb, var(--accent) 9%, var(--bg-primary));
    border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
    font-size: 13.5px;
    line-height: 1.85;
}
.sc-tip ul { margin: 6px 0 0; padding-left: 22px; }

.sc-about {
    margin-top: 18px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-secondary);
    padding: 18px 20px 22px;
    font-size: 14px;
    line-height: 1.9;
}
.sc-about h2 { margin: 0 0 10px; font-size: 17px; font-weight: 700; }
.sc-about h3 { margin: 20px 0 8px; font-size: 15px; font-weight: 700; }
.sc-about p { margin: 0 0 8px; }
.sc-about ul { margin: 0 0 8px; padding-left: 22px; }
.sc-note { font-size: 13px; color: var(--text-secondary); }

/* ---------- 忙碌 / Toast ---------- */
.sc-busy {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 100001;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    border-radius: 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    box-shadow: 0 10px 34px rgba(0, 0, 0, .22);
    font-size: 14px;
    color: var(--text-primary);
}
.sc-busy[hidden] { display: none !important; }
.sc-spin {
    width: 18px;
    height: 18px;
    border: 2px solid color-mix(in srgb, var(--accent) 35%, transparent);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: sc-spin .8s linear infinite;
}
@keyframes sc-spin { to { transform: rotate(360deg); } }

.sc-toast {
    position: fixed;
    left: 50%;
    bottom: 34px;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 10px 18px;
    border-radius: 10px;
    font-size: 14px;
    z-index: 100000;
    box-shadow: 0 8px 26px rgba(0, 0, 0, .22);
    max-width: 88vw;
    text-align: center;
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
}
.sc-toast[hidden] { display: none !important; }

/* ================= 响应式 ================= */

/* 桌面：取景区自适应 + 控制面板定宽吸顶 */
@media (min-width: 1000px) {
    .sc-row {
        grid-template-columns: minmax(0, 1fr) minmax(330px, 380px);
        align-items: start;
    }
    /* --sc-stick 由 JS 按站点吸顶 .page-header 的实际高度计算，避免被其遮挡 */
    .sc-panel {
        position: sticky;
        top: var(--sc-stick, 76px);
        max-height: calc(100vh - var(--sc-stick, 76px) - 24px);
        overflow-y: auto;
        padding-right: 2px;
    }
    .sc-canvas { max-height: min(68vh, 700px); }
}

/* 平板：单列，但控制面板两列并排，减少纵向滚动 */
@media (min-width: 680px) and (max-width: 999px) {
    .sc-panel {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
    .sc-panel .sc-card:last-child { grid-column: 1 / -1; }
    .sc-canvas { max-height: 56vh; }
}

@media (max-width: 900px) {
    .sc-hero h1 { font-size: 22px; }
}

/* 手机：单列、大触控区 */
@media (max-width: 680px) {
    .sc-page { padding: 16px 14px 48px; }
    .sc-drop { padding: 26px 14px; border-radius: 16px; }
    .sc-page.has-pages .sc-drop { padding: 12px 14px; gap: 10px; }
    .sc-stage { padding: 12px; }
    .sc-stage-h { flex-direction: column; align-items: stretch; }
    .sc-stage-acts { width: 100%; }
    .sc-stage-acts .sc-btn { flex: 1 1 0; min-height: 44px; }
    .sc-seg { width: 100%; }
    .sc-seg-btn { flex: 1 1 0; min-height: 40px; }
    .sc-canvas { max-height: 46vh; }
    .sc-thumb { width: 68px; }
    .sc-thumb img { height: 68px; }
    .sc-exports .sc-btn { width: 100%; min-height: 44px; }
    .sc-pages-acts { width: 100%; margin-left: 0; }
    .sc-pages-acts .sc-btn { flex: 1 1 0; min-height: 44px; }
    .sc-help, .sc-about { padding-left: 16px; padding-right: 16px; border-radius: 14px; }
    .sc-mode { min-height: 48px; }
}

@media (max-width: 420px) {
    .sc-modes { grid-template-columns: 1fr; }
    .sc-hero-ico { width: 46px; height: 46px; font-size: 24px; }
    .sc-card { padding: 12px 13px 14px; }
    .sc-thumb { width: 60px; }
    .sc-thumb img { height: 60px; }
    .sc-page { padding-bottom: 40px; }
}

@media (prefers-reduced-motion: reduce) {
    .sc-drop, .sc-btn, .sc-mode, .sc-seg-btn, .sc-thumb { transition: none !important; }
    .sc-spin { animation: none !important; }
    .sc-thumb:hover { transform: none !important; }
}