/* Favicon 图标生成器 /tools/favicon
   —— 三端排版与配色规范
 *
 * 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（保留左侧导航）」规范，
 *    容器不限宽；「选择尺寸」与「图标样式」并排成两栏，减少纵向滚动；
 *    尺寸预览网格用 auto-fill 铺满整行；说明类长文收在 940px 阅读宽度内居中，
 *    避免整屏下单行过长（一行超过约 90 字符会显著降低阅读效率）。
 *  · 平板 680 - 999px：两栏回落单列，选项区自适应两列，预览网格 160px。
 *  · 手机 ≤680px：单列、操作按钮整行铺满、触控区 ≥44px，
 *    所有输入控件 font-size:16px（iOS Safari 聚焦时 <16px 会强制放大页面）。
 *  · ≤420px：预览两列、按钮纵向铺满、间距与圆角收紧。
 *
 * 配色：全部走站点主题变量（--bg-primary / --bg-secondary / --text-primary /
 *      --text-secondary / --accent / --border），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，
 *      不使用大面积饱和色块，避免与左侧导航抢注意力。
 */

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

/* ---------- Hero ---------- */
.fv-hero {
    text-align: center;
    padding: 4px 0 clamp(20px, 3vw, 30px);
}
.fv-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);
}
.fv-hero h1 {
    margin: 0 0 8px;
    font-size: clamp(21px, 2.4vw, 28px);
    font-weight: 700;
    letter-spacing: .4px;
    line-height: 1.3;
}
.fv-hero-sub {
    margin: 0 auto;
    max-width: 760px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* ---------- 拖拽 / 选择区 ---------- */
.fv-drop {
    border: 2px dashed var(--border);
    border-radius: 18px;
    background: var(--bg-secondary);
    padding: clamp(28px, 5vw, 52px) 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color .18s ease, background .18s ease;
}
.fv-drop:hover,
.fv-drop.is-over {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--bg-secondary));
}
.fv-drop:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
.fv-drop-ico {
    font-size: clamp(34px, 4vw, 42px);
    line-height: 1;
    margin-bottom: 14px;
    opacity: .85;
}
.fv-drop-t {
    margin: 0 0 8px;
    font-size: 16px;
    font-weight: 600;
}
.fv-drop-link {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.fv-drop-s {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--text-secondary);
}

/* ---------- 源图信息 ---------- */
.fv-src {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 14px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--bg-secondary);
}
.fv-src[hidden],
.fv-card[hidden] { display: none !important; }
.fv-src-img {
    width: 56px;
    height: 56px;
    object-fit: contain;
    border-radius: 10px;
    background:
        repeating-conic-gradient(color-mix(in srgb, var(--text-primary) 8%, transparent) 0% 25%, transparent 0% 50%) 50% / 14px 14px;
    border: 1px solid var(--border);
    flex: 0 0 auto;
}
.fv-src-meta { flex: 1 1 auto; min-width: 0; }
.fv-src-name {
    font-size: 14px;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.fv-src-dim { font-size: 12.5px; color: var(--text-secondary); margin-top: 3px; }

/* ---------- 桌面两栏：尺寸 + 样式 ---------- */
.fv-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 18px;
}

/* ---------- 卡片 ---------- */
.fv-card {
    margin-top: 18px;
    padding: 16px 18px 18px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-secondary);
    box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
    min-width: 0;
}
.fv-row .fv-card { margin-top: 0; }
.fv-card-h {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}
.fv-card-h h2 { margin: 0; font-size: 16px; font-weight: 700; }
.fv-card-acts { display: flex; gap: 8px; }
.fv-card-note { font-size: 12.5px; color: var(--text-secondary); }

/* ---------- 尺寸胶囊 ---------- */
.fv-sizes {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}
.fv-size {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 999px;
    padding: 7px 15px;
    font-size: 13.5px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    transition: background .15s ease, border-color .15s ease, color .15s ease, transform .08s ease;
}
.fv-size:hover { border-color: var(--accent); }
.fv-size:active { transform: scale(.97); }
.fv-size:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.fv-size.is-on {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 600;
}

.fv-custom {
    display: flex;
    gap: 8px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px dashed var(--border);
}
.fv-custom .fv-input { flex: 0 1 240px; min-width: 0; }

/* ---------- 样式选项 ---------- */
.fv-opts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 12px 24px;
}
.fv-opt {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13.5px;
    min-width: 0;
}
.fv-opt-l { flex: 0 0 58px; color: var(--text-secondary); }
.fv-opt input[type="range"] { flex: 1 1 auto; min-width: 0; accent-color: var(--accent); height: 28px; }
.fv-opt-v {
    flex: 0 0 44px;
    text-align: right;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 12.5px;
    color: var(--text-secondary);
}
.fv-opt select { flex: 1 1 auto; min-width: 0; }
.fv-opt input[type="color"] {
    width: 46px;
    height: 32px;
    padding: 2px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-primary);
    cursor: pointer;
}

/* ---------- 输入 / 按钮 ---------- */
.fv-input {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 9px;
    padding: 8px 11px;
    font-size: 14px;
    font-family: inherit;
    min-width: 0;
}
.fv-input:focus { outline: none; border-color: var(--accent); }

.fv-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, background .15s ease, filter .15s ease;
}
.fv-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.fv-btn:active:not(:disabled) { transform: translateY(1px); }
.fv-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.fv-btn:disabled { opacity: .5; cursor: not-allowed; }
.fv-btn-sm { min-height: 34px; padding: 6px 13px; font-size: 13px; }
.fv-btn-ghost { background: transparent; }
.fv-btn-pri {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 600;
}
.fv-btn-pri:hover:not(:disabled) { filter: brightness(1.08); color: #fff; }

/* ---------- 批量下载条 ---------- */
.fv-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 18px;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--bg-secondary);
}
.fv-bar-tip {
    font-size: 13px;
    color: var(--text-secondary);
    min-width: 0;
    flex: 1 1 200px;
}

/* ---------- 预览网格 ---------- */
.fv-grid {
    margin-top: 18px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}
.fv-grid:empty { display: none; }
.fv-item {
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--bg-secondary);
    padding: 14px;
    text-align: center;
    min-width: 0;
    transition: border-color .16s ease, box-shadow .16s ease;
}
.fv-item:hover {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
    box-shadow: 0 2px 10px rgba(0, 0, 0, .06);
}
.fv-item-pv {
    height: 104px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    margin-bottom: 10px;
    background:
        repeating-conic-gradient(color-mix(in srgb, var(--text-primary) 8%, transparent) 0% 25%, transparent 0% 50%) 50% / 16px 16px;
}
.fv-item-pv img { max-width: 100%; max-height: 100%; }
.fv-item-t {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13.5px;
    font-weight: 600;
    margin-bottom: 2px;
}
.fv-item-s { font-size: 12px; color: var(--text-secondary); margin-bottom: 10px; }
.fv-item-acts { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

.fv-empty {
    margin-top: 18px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    padding: 26px 0;
}
.fv-empty[hidden] { display: none !important; }

/* ---------- 引用代码 ---------- */
.fv-snip {
    margin: 0 0 10px;
    padding: 14px;
    border-radius: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 12.5px;
    line-height: 1.75;
    color: var(--text-primary);
    overflow-x: auto;
    white-space: pre;
    max-height: 320px;
    overflow-y: auto;
}

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

.fv-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;
}
.fv-about h2 { margin: 0 0 10px; font-size: 17px; font-weight: 700; }
.fv-about h3 { margin: 20px 0 8px; font-size: 15px; font-weight: 700; }
.fv-about p { margin: 0 0 8px; color: var(--text-primary); }
.fv-about ul { margin: 0 0 8px; padding-left: 22px; color: var(--text-primary); }
.fv-note { font-size: 13px; color: var(--text-secondary); }
.fv-code {
    margin: 0 0 10px;
    padding: 13px 14px;
    border-radius: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 12.5px;
    line-height: 1.8;
    overflow-x: auto;
    white-space: pre;
}

/* ---------- Toast ---------- */
.fv-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));
}
.fv-toast[hidden] { display: none !important; }

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

/* 大屏：尺寸与样式并排，网格铺满 */
@media (min-width: 1000px) {
    .fv-row {
        grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
        align-items: start;
    }
}

/* 平板 / 窄窗：回落单列，网格收紧 */
@media (max-width: 999px) {
    .fv-row { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
    .fv-hero h1 { font-size: 22px; }
    .fv-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 13px; }
    .fv-item-pv { height: 92px; }
}

/* 手机：单列、大触控区、16px 输入防 iOS 缩放 */
@media (max-width: 680px) {
    .fv-page { padding: 16px 14px 48px; }
    .fv-drop { padding: 30px 14px; border-radius: 16px; }
    .fv-bar { flex-direction: column; align-items: stretch; gap: 8px; }
    .fv-bar .fv-btn { width: 100%; min-height: 44px; }
    .fv-bar-tip { text-align: center; flex: 1 1 auto; }
    /* iOS Safari 聚焦时字号 <16px 会强制放大页面 */
    .fv-input { font-size: 16px; }
    .fv-custom { flex-direction: column; }
    .fv-custom .fv-input { flex: 1 1 auto; width: 100%; }
    .fv-custom .fv-btn { width: 100%; min-height: 44px; }
    .fv-size { min-height: 40px; padding: 8px 14px; }
    .fv-src { flex-wrap: wrap; }
    .fv-src .fv-btn { min-height: 44px; }
    .fv-item-acts .fv-btn { min-height: 40px; }
    .fv-help, .fv-about { padding-left: 16px; padding-right: 16px; border-radius: 14px; }
    .fv-snip, .fv-code { font-size: 12px; }
}

/* 小屏手机：预览两列、按钮纵向铺满 */
@media (max-width: 420px) {
    .fv-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
    .fv-item { padding: 10px; }
    .fv-item-pv { height: 74px; }
    .fv-item-acts { flex-direction: column; }
    .fv-item-acts .fv-btn { width: 100%; }
    .fv-hero-ico { width: 46px; height: 46px; font-size: 24px; }
    .fv-card { padding: 14px 14px 16px; }
    .fv-opts { gap: 10px; }
    .fv-opt-l { flex: 0 0 48px; }
    .fv-card-acts { width: 100%; }
    .fv-card-acts .fv-btn { flex: 1 1 0; }
}

/* 尊重系统「减弱动态效果」设置 */
@media (prefers-reduced-motion: reduce) {
    .fv-drop,
    .fv-size,
    .fv-btn,
    .fv-item { transition: none !important; }
    .fv-size:active,
    .fv-btn:active { transform: none !important; }
}