/* ==========================================================================
   Bishun · 汉字笔顺
   ========================================================================== */

:root {
    --bg: #ffffff;
    --ink: #101a14;
    --ink-soft: #26342b;
    --muted: #6f7a72;
    --muted-2: #8b958d;
    --line: rgba(16, 32, 22, 0.09);
    --line-strong: rgba(16, 32, 22, 0.14);
    --green: #00d96b;
    --green-deep: #00bd5e;
    --green-dark: #009c52;
    --green-soft: rgba(0, 217, 107, 0.12);
    --paper: #ffffff;
    --serif: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
    --top-h: 62px;
    --footer-h: 92px;
    --app-w: 560px;
    color-scheme: light;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--bg);
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    margin: 0;
    overflow: hidden;
    color: var(--ink);
    background: var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC",
        "Helvetica Neue", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    -webkit-tap-highlight-color: transparent;
}

/* 背景：极浅的方格纸 + 顶部一点绿意 */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(16, 32, 22, 0.028) 1px, transparent 1px),
        linear-gradient(90deg, rgba(16, 32, 22, 0.028) 1px, transparent 1px);
    background-size: 46px 46px;
    -webkit-mask-image: radial-gradient(ellipse 72% 58% at 50% 26%, #000 6%, transparent 76%);
    mask-image: radial-gradient(ellipse 72% 58% at 50% 26%, #000 6%, transparent 76%);
}

body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 0;
    height: 320px;
    pointer-events: none;
    background: radial-gradient(ellipse 66% 100% at 50% 0%, rgba(0, 217, 107, 0.1), transparent 72%);
}

::selection {
    color: #ffffff;
    background: #00a859;
}

button {
    font: inherit;
    color: inherit;
}

img,
svg {
    -webkit-user-drag: none;
    user-select: none;
}

[hidden] {
    display: none !important;
}

/* 页面骨架 ----------------------------------------------------------------- */

.bs-app {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: var(--app-w);
    height: 100vh;
    height: 100dvh;
    margin: 0 auto;
    padding-top: env(safe-area-inset-top);
    overflow: hidden;
}

/* 顶部字组 ---------------------------------------------------------------- */

.bs-top {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    height: var(--top-h);
    padding: 0 18px;
}

.bs-chars {
    display: flex;
    flex: 1 1 auto;
    align-items: center;
    gap: 6px;
    min-width: 0;
    padding: 2px 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 16px), transparent);
    mask-image: linear-gradient(to right, #000 calc(100% - 16px), transparent);
}

.bs-chars::-webkit-scrollbar {
    display: none;
}

.bs-char {
    display: grid;
    flex: 0 0 auto;
    place-items: center;
    width: 34px;
    height: 34px;
    border: 1px solid rgba(16, 32, 22, 0.12);
    border-radius: 10px;
    background: #ffffff;
    color: #3c4a41;
    font-family: var(--serif);
    font-size: 17px;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease,
        box-shadow 0.18s ease, transform 0.18s ease;
}

a.bs-char:hover {
    border-color: rgba(0, 189, 94, 0.45);
    color: var(--green-dark);
}

a.bs-char:active {
    transform: scale(0.95);
}

.bs-char.is-active {
    border-color: #121915;
    background: #121915;
    color: #ffffff;
}

.bs-char.is-muted {
    border-style: dashed;
    color: #98a29a;
}

.bs-search-btn {
    display: grid;
    flex: 0 0 auto;
    place-items: center;
    width: 38px;
    height: 38px;
    padding: 0;
    border: 1px solid var(--line-strong);
    border-radius: 12px;
    background: #ffffff;
    color: var(--ink-soft);
    cursor: pointer;
    transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.bs-search-btn svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-width: 1.8;
}

.bs-search-btn:hover {
    border-color: rgba(0, 189, 94, 0.5);
    color: var(--green-dark);
}

.bs-search-btn:active {
    transform: scale(0.96);
}

.bs-search-btn[aria-expanded="true"] {
    border-color: rgba(0, 189, 94, 0.5);
    color: var(--green-dark);
}

/* 搜索面板 ---------------------------------------------------------------- */

.bs-search {
    position: absolute;
    top: calc(var(--top-h) + env(safe-area-inset-top));
    right: 0;
    left: 0;
    z-index: 20;
    padding: 0 18px 14px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 34px rgba(16, 32, 22, 0.08);
    background: rgba(255, 255, 255, 0.94);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    animation: bs-drop 0.22s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.bs-search-form {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px;
    border: 1px solid var(--line-strong);
    border-radius: 14px;
    background: #ffffff;
    box-shadow: 0 10px 30px rgba(16, 32, 22, 0.07);
}

.bs-search-input {
    flex: 1 1 auto;
    min-width: 0;
    height: 38px;
    padding: 0 10px;
    border: 0;
    background: transparent;
    color: var(--ink);
    font-size: 16px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.bs-search-input::placeholder {
    color: #a6b0a8;
}

.bs-search-input.is-invalid {
    animation: bs-shake 0.36s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

.bs-search-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
}

.bs-search-submit {
    flex: 0 0 auto;
    height: 36px;
    padding: 0 17px;
    border: 0;
    border-radius: 10px;
    background: #121915;
    color: #ffffff;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.03em;
    cursor: pointer;
}

.bs-search-submit:active {
    transform: scale(0.97);
}

/* 学一学 / 写一写 ---------------------------------------------------------- */

.bs-tabs {
    display: grid;
    flex: 0 0 auto;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    margin: 4px 18px 0;
    padding: 4px;
    border: 1px solid rgba(16, 32, 22, 0.05);
    border-radius: 15px;
    background: #f2f5f3;
}

.bs-tab {
    position: relative;
    height: 38px;
    padding: 0;
    border: 0;
    border-radius: 11px;
    background: transparent;
    color: #69766d;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease, box-shadow 0.25s ease;
}

.bs-tab.is-active {
    background: #121915;
    box-shadow: 0 8px 18px rgba(16, 26, 20, 0.18);
    color: #ffffff;
}

.bs-tab:not(.is-active):active {
    background: rgba(16, 32, 22, 0.06);
}

/* 滚动区域 ---------------------------------------------------------------- */

.bs-scroll {
    flex: 1 1 auto;
    min-height: 0;
    padding: 12px 18px 20px;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.bs-scroll::-webkit-scrollbar {
    display: none;
}

/* 笔顺演示 ---------------------------------------------------------------- */

.bs-stage {
    padding: 12px 12px 10px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: linear-gradient(180deg, #ffffff 0%, #fbfdfb 100%);
    box-shadow:
        0 14px 36px rgba(16, 32, 22, 0.055),
        inset 0 1px 0 #ffffff;
}

.bs-grid {
    position: relative;
    width: 100%;
    max-width: 332px;
    margin: 0 auto;
    overflow: hidden;
    border: 1px solid rgba(16, 32, 22, 0.13);
    border-radius: 16px;
    background: #ffffff;
    aspect-ratio: 1 / 1;
}

/* 田字格虚线 */
.bs-grid::before,
.bs-grid::after {
    content: "";
    position: absolute;
    z-index: 0;
    pointer-events: none;
}

.bs-grid::before {
    top: 50%;
    right: 0;
    left: 0;
    height: 1px;
    background-image: linear-gradient(90deg, rgba(16, 32, 22, 0.15) 50%, transparent 50%);
    background-size: 9px 1px;
}

.bs-grid::after {
    top: 0;
    bottom: 0;
    left: 50%;
    width: 1px;
    background-image: linear-gradient(180deg, rgba(16, 32, 22, 0.15) 50%, transparent 50%);
    background-size: 1px 9px;
}

.bs-writer {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.bs-writer svg {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: pan-y;
}

.bs-body[data-mode="write"] .bs-writer svg {
    touch-action: none;
}

.bs-grid-loader {
    position: absolute;
    inset: 0;
    z-index: 3;
    display: grid;
    place-items: center;
    background: #ffffff;
    transition: opacity 0.3s ease;
}

.bs-grid-loader.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.bs-grid-loader span {
    width: 26px;
    height: 26px;
    border: 2px solid rgba(16, 32, 22, 0.1);
    border-top-color: var(--green-deep);
    border-radius: 50%;
    animation: bs-spin 0.8s linear infinite;
}

.bs-stage-foot {
    display: flex;
    justify-content: center;
    margin-top: 10px;
}

.bs-reset {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 16px;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    background: #ffffff;
    color: var(--ink-soft);
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.bs-reset svg {
    width: 14px;
    height: 14px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.9;
}

.bs-reset:hover {
    border-color: rgba(0, 189, 94, 0.45);
    box-shadow: 0 6px 16px rgba(0, 189, 94, 0.12);
    color: var(--green-dark);
}

.bs-reset:active {
    transform: scale(0.96);
}

.bs-status {
    min-height: 15px;
    margin: 7px 0 0;
    color: var(--muted-2);
    font-size: 11px;
    line-height: 1.4;
    text-align: center;
    letter-spacing: 0.02em;
    transition: color 0.2s ease;
}

.bs-status.is-good {
    color: var(--green-dark);
}

/* 汉字信息 ---------------------------------------------------------------- */

.bs-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 11px;
    padding: 13px 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #ffffff;
}

.bs-thumb {
    position: relative;
    flex: 0 0 64px;
    width: 64px;
    height: 64px;
    overflow: hidden;
    border: 1px solid rgba(16, 32, 22, 0.12);
    border-radius: 13px;
    background: #ffffff;
}

.bs-thumb-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(90deg, rgba(16, 32, 22, 0.09) 50%, transparent 50%),
        linear-gradient(180deg, rgba(16, 32, 22, 0.09) 50%, transparent 50%);
    background-repeat: repeat-x, repeat-y;
    background-position: 0 50%, 50% 0;
    background-size: 9px 1px, 1px 9px;
}

.bs-char-svg {
    position: absolute;
    top: 4%;
    left: 4%;
    z-index: 1;
    width: 92%;
    height: 92%;
    color: var(--ink);
}

.bs-info-body {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
}

.bs-pinyin {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 3px 9px;
}

.bs-py {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin: 0;
    padding: 2px 0;
    border: 0;
    border-radius: 8px;
    background: none;
    color: var(--ink);
    font-family: var(--serif);
    font-size: 21px;
    line-height: 1.1;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: color 0.18s ease;
}

.bs-py--muted {
    color: #4c5a51;
    cursor: default;
}

button.bs-py:hover {
    color: var(--green-dark);
}

button.bs-py:hover .bs-py-text {
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
}

.bs-py-text {
    white-space: nowrap;
}

.bs-py-icon {
    width: 13px;
    height: 13px;
    fill: none;
    stroke: var(--green-deep);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.7;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.bs-py-icon .bs-py-fill {
    fill: var(--green-deep);
    stroke: none;
}

.bs-py.is-playing .bs-py-icon {
    animation: bs-pulse 0.6s ease-in-out 2;
}

.bs-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 12px;
    margin: 0;
    font-size: 11.5px;
    line-height: 1.5;
}

.bs-meta span {
    color: var(--ink);
    font-weight: 600;
    letter-spacing: 0.01em;
}

.bs-meta em {
    margin-right: 4px;
    color: #909b93;
    font-style: normal;
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.03em;
}

/* 笔画列表 ---------------------------------------------------------------- */

.bs-strokes {
    margin-top: 11px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #ffffff;
}

.bs-stroke-defs {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
    pointer-events: none;
}

.bs-stroke-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(86px, 1fr));
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.bs-stroke {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 100%;
    padding: 0;
    border: 0;
    background: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.bs-stroke-no {
    padding-left: 2px;
    color: #93a099;
    font-size: 10px;
    line-height: 1;
    letter-spacing: 0.03em;
    transition: color 0.2s ease;
}

.bs-stroke-grid {
    position: relative;
    display: block;
    width: 100%;
    overflow: hidden;
    border: 1px solid rgba(16, 32, 22, 0.12);
    border-radius: 12px;
    background: #ffffff;
    aspect-ratio: 1 / 1;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.bs-stroke:active .bs-stroke-grid {
    transform: scale(0.97);
}

.bs-stroke.is-active .bs-stroke-grid {
    border-color: rgba(0, 189, 94, 0.6);
    box-shadow: 0 0 0 3px var(--green-soft);
}

.bs-stroke.is-active .bs-stroke-no {
    color: var(--green-dark);
}

.bs-stroke-cross {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(90deg, rgba(16, 32, 22, 0.07) 50%, transparent 50%),
        linear-gradient(180deg, rgba(16, 32, 22, 0.07) 50%, transparent 50%);
    background-repeat: repeat-x, repeat-y;
    background-position: 0 50%, 50% 0;
    background-size: 9px 1px, 1px 9px;
}

.bs-stroke-svg {
    position: absolute;
    top: 6%;
    left: 6%;
    z-index: 1;
    width: 88%;
    height: 88%;
}

/* 每个小田字格里：整字浅灰描红、已写笔画黑、当前笔画红 */
.bs-stroke-svg .bs-stroke-trace {
    fill: #e1e8e2;
}

.bs-stroke-svg .bs-stroke-past {
    fill: var(--ink);
}

.bs-stroke-svg .bs-stroke-now {
    fill: #d9483a;
}

.bs-footnote {
    margin: 18px 0 2px;
    color: #a3ada5;
    font-size: 10.5px;
    letter-spacing: 0.14em;
    text-align: center;
}

/* 未收录 ------------------------------------------------------------------ */

.bs-empty {
    display: grid;
    flex: 1 1 auto;
    place-items: center;
    min-height: 0;
    padding: 16px 18px 24px;
}

.bs-empty-card {
    width: 100%;
    max-width: 340px;
    padding: 26px 22px 24px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: #ffffff;
    box-shadow:
        0 20px 46px rgba(16, 32, 22, 0.07),
        inset 0 1px 0 #ffffff;
    text-align: center;
    animation: bs-rise 0.5s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.bs-empty-icon {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    box-shadow: 0 12px 28px rgba(16, 32, 22, 0.16);
    object-fit: cover;
}

.bs-empty-title {
    margin: 16px 0 0;
    color: var(--ink);
    font-family: var(--serif);
    font-size: 24px;
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: 0.02em;
}

.bs-empty-desc {
    margin: 8px 0 20px;
    color: var(--muted);
    font-size: 12.5px;
    line-height: 1.65;
}

.bs-empty-search {
    height: 42px;
    padding: 0 26px;
    border: 0;
    border-radius: 999px;
    background: #121915;
    color: #ffffff;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.bs-empty-search:hover {
    box-shadow: 0 10px 24px rgba(16, 26, 20, 0.22);
}

.bs-empty-search:active {
    transform: scale(0.97);
}

/* 底部 App 信息 ----------------------------------------------------------- */

.bs-footer {
    position: relative;
    z-index: 5;
    flex: 0 0 calc(var(--footer-h) + env(safe-area-inset-bottom));
    height: calc(var(--footer-h) + env(safe-area-inset-bottom));
    padding-bottom: env(safe-area-inset-bottom);
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.97));
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
}

.bs-footer-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    max-width: var(--app-w);
    height: var(--footer-h);
    margin: 0 auto;
    padding: 0 18px;
}

.bs-app-block {
    display: flex;
    align-items: center;
    gap: 11px;
    min-width: 0;
}

.bs-app-logo {
    display: block;
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: #050805;
    object-fit: cover;
}

.bs-app-copy {
    min-width: 0;
}

.bs-app-name {
    margin: 0;
    color: var(--ink);
    font-size: 14.5px;
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.bs-app-desc {
    margin: 3px 0 0;
    overflow: hidden;
    color: var(--muted-2);
    font-size: 11px;
    line-height: 1.3;
    letter-spacing: 0.02em;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bs-download {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 40px;
    margin-left: auto;
    padding: 0 20px;
    border-radius: 999px;
    background: linear-gradient(180deg, #00f07f, var(--green-deep));
    box-shadow:
        0 8px 22px rgba(0, 230, 118, 0.24),
        inset 0 1px 0 rgba(255, 255, 255, 0.36);
    color: #04150c;
    font-size: 13.5px;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-decoration: none;
    transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.bs-download:hover {
    filter: brightness(1.05);
    box-shadow:
        0 12px 28px rgba(0, 230, 118, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.36);
    transform: translateY(-1px);
}

.bs-download:active {
    transform: scale(0.98);
}

.bs-apple {
    width: 13px;
    height: 16px;
    margin-top: -1px;
}

.bs-qr {
    display: flex;
    flex: 0 0 auto;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    margin-left: auto;
}

.bs-qr-img {
    display: block;
    width: 56px;
    height: 56px;
    background: #ffffff;
    object-fit: contain;
}

.bs-qr-text {
    margin: 0;
    color: #5c6b61;
    font-size: 9.5px;
    line-height: 1.2;
    white-space: nowrap;
}

/* 键盘焦点 ---------------------------------------------------------------- */

.bs-char:focus-visible,
.bs-search-btn:focus-visible,
.bs-tab:focus-visible,
.bs-reset:focus-visible,
.bs-py:focus-visible,
.bs-stroke:focus-visible,
.bs-download:focus-visible,
.bs-search-submit:focus-visible,
.bs-empty-search:focus-visible {
    outline: 2px solid rgba(0, 168, 89, 0.55);
    outline-offset: 2px;
}

/* 动效 -------------------------------------------------------------------- */

@keyframes bs-spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes bs-rise {
    from {
        opacity: 0;
        transform: translateY(9px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bs-drop {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bs-shake {
    10%,
    90% {
        transform: translateX(-1px);
    }

    20%,
    80% {
        transform: translateX(2px);
    }

    30%,
    50%,
    70% {
        transform: translateX(-3px);
    }

    40%,
    60% {
        transform: translateX(3px);
    }
}

@keyframes bs-pulse {
    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.55;
        transform: scale(0.86);
    }
}

.bs-stage,
.bs-info,
.bs-strokes {
    animation: bs-rise 0.5s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.bs-info {
    animation-delay: 0.04s;
}

.bs-strokes {
    animation-delay: 0.08s;
}

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

/* 小屏适配 ---------------------------------------------------------------- */

@media (max-width: 380px) {
    :root {
        --top-h: 58px;
    }

    .bs-top {
        padding: 0 14px;
    }

    .bs-chars {
        gap: 5px;
    }

    .bs-char {
        width: 30px;
        height: 30px;
        border-radius: 9px;
        font-size: 16px;
    }

    .bs-search-btn {
        width: 35px;
        height: 35px;
    }

    .bs-tabs {
        margin-right: 14px;
        margin-left: 14px;
    }

    .bs-scroll {
        padding-right: 14px;
        padding-left: 14px;
    }

    .bs-grid {
        max-width: 300px;
    }

    .bs-stroke-list {
        grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
        gap: 7px;
    }

    .bs-thumb {
        flex-basis: 58px;
        width: 58px;
        height: 58px;
    }

    .bs-py {
        font-size: 21px;
    }

    .bs-footer-inner {
        padding: 0 14px;
    }

    .bs-download {
        height: 38px;
        padding: 0 16px;
        font-size: 13px;
    }
}

@media (max-height: 730px) {
    :root {
        --top-h: 56px;
        --footer-h: 84px;
    }

    .bs-grid {
        max-width: 288px;
    }

    .bs-status {
        margin-top: 5px;
    }

    .bs-stage-foot {
        margin-top: 8px;
    }

    .bs-app-logo {
        flex-basis: 40px;
        width: 40px;
        height: 40px;
    }
}

@media (max-height: 640px) {
    .bs-grid {
        max-width: 220px;
    }

    .bs-stage {
        padding-top: 10px;
    }

    .bs-info {
        padding: 11px;
    }

    .bs-tabs {
        margin-top: 2px;
    }

    .bs-scroll {
        padding-top: 8px;
    }
}

/* 桌面：保持居中的移动端阅读宽度 ------------------------------------------ */

@media (min-width: 760px) {
    .bs-app {
        border-right: 1px solid rgba(16, 32, 22, 0.05);
        border-left: 1px solid rgba(16, 32, 22, 0.05);
        background: rgba(255, 255, 255, 0.55);
        -webkit-backdrop-filter: blur(2px);
        backdrop-filter: blur(2px);
    }

    .bs-grid {
        max-width: 350px;
    }
}

/* --------------------------------------------------------------------------
   嵌入练写字APP 主题后的覆盖（共享页眉/页脚）
   -------------------------------------------------------------------------- */

.lxz-app-body.bs-page .lxz-app-main {
    overflow: hidden;
}

.lxz-app-body.bs-page .bs-app {
    height: 100%;
    padding-top: 0;
}