/* ============ 找不同 ============ */
:root {
    --sd-paper: #f4ecd8;
    --sd-paper-2: #ebe0c6;
    --sd-paper-3: #d9c9a3;
    --sd-ink: #1a1410;
    --sd-ink-2: #3a3024;
    --sd-ink-3: #6b5d44;
    --sd-vermilion: #b91c1c;
    --sd-vermilion-d: #8a1414;
    --sd-jade: #0c4da2;
    --sd-gold: #b8860b;
    --sd-green: #16a34a;
    --sd-shadow: 0 1px 0 rgba(58,48,36,.18), 0 4px 12px rgba(58,48,36,.10);
}

* { box-sizing: border-box; }

html, body {
    margin: 0; padding: 0;
    height: 100vh;
    overflow: hidden;
    overscroll-behavior: none;
    font-family: "Kaiti", "STKaiti", "KaiTi", "STSong", "FangSong", serif;
    color: var(--sd-ink);
    -webkit-tap-highlight-color: transparent;
}

.sd-fullscreen {
    height: 100vh; height: 100dvh;
    display: flex; flex-direction: column;
    background: var(--sd-paper);
    background-image:
      radial-gradient(circle at 20% 10%, rgba(184,134,11,.06) 0, transparent 40%),
      radial-gradient(circle at 80% 80%, rgba(185,28,28,.04) 0, transparent 40%);
}

/* ============ 顶栏 ============ */
.sd-header {
    flex: 0 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 14px;
    border-bottom: 1px solid rgba(58,48,36,.18);
    background: rgba(244,236,216,.72);
    backdrop-filter: blur(8px);
}
.sd-back {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--sd-ink-2); text-decoration: none;
    padding: 6px 10px; border-radius: 8px;
    font-size: 15px;
    transition: background .15s;
    cursor: pointer;
}
.sd-back:hover { background: rgba(58,48,36,.08); }
.sd-back i { font-size: 18px; }
.sd-title {
    font-size: 19px; font-weight: 700; letter-spacing: 6px;
    color: var(--sd-ink);
    padding-left: 6px;
}
.sd-spacer { width: 60px; }

/* ============ 主体 ============ */
.sd-main {
    flex: 1 1 auto;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 14px 14px 20px;
}
.sd-screen { animation: sd-fade .25s ease; }
.sd-screen.hidden { display: none; }
@keyframes sd-fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; } }

/* ============ 主菜单 ============ */
.sd-intro {
    text-align: center;
    padding: 8px 0 16px;
}
.sd-seal {
    display: inline-block;
    padding: 4px 14px;
    background: var(--sd-vermilion);
    color: #fdf6e3;
    border-radius: 4px;
    font-size: 13px; letter-spacing: 4px;
    margin-bottom: 8px;
    font-weight: 600;
}
.sd-intro-title {
    font-size: 28px; margin: 0 0 6px;
    letter-spacing: 4px;
    color: var(--sd-ink);
    font-weight: 700;
}
.sd-intro-sub {
    font-size: 14px;
    color: var(--sd-ink-3);
    margin: 0;
}

.sd-levels {
    max-width: 720px; margin: 14px auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}
@media (min-width: 520px) {
    .sd-levels { grid-template-columns: repeat(3, 1fr); }
}
.sd-level-card {
    width: 100%;
    background: #fdf6e3;
    border: 1px solid var(--sd-paper-3);
    border-radius: 14px;
    padding: 18px 12px 14px;
    text-align: center;
    cursor: pointer;
    box-shadow: var(--sd-shadow);
    transition: transform .1s, box-shadow .15s;
    font-family: inherit;
    color: inherit;
}
.sd-level-card:hover { transform: translateY(-1px); box-shadow: 0 2px 0 rgba(58,48,36,.18), 0 8px 18px rgba(58,48,36,.14); }
.sd-level-num {
    font-size: 36px;
    color: var(--sd-vermilion);
    font-weight: 700;
}
.sd-level-name {
    font-size: 18px; font-weight: 700;
    color: var(--sd-ink);
    margin-top: 4px;
}
.sd-level-meta {
    font-size: 13px; color: var(--sd-ink-3);
    margin-top: 4px;
}
.sd-level-best {
    font-size: 12px; color: var(--sd-gold);
    margin-top: 6px;
}

.sd-howto {
    max-width: 480px; margin: 18px auto 8px;
    padding: 12px 16px;
    background: rgba(255,250,239,.7);
    border: 1px dashed rgba(58,48,36,.25);
    border-radius: 10px;
}
.sd-howto h3 { margin: 0 0 6px; font-size: 14px; color: var(--sd-ink-2); }
.sd-howto ul { margin: 0; padding-left: 18px; font-size: 13px; color: var(--sd-ink-3); line-height: 1.8; }

/* ============ 游戏 HUD ============ */
.sd-hud {
    display: flex; gap: 8px;
    margin-bottom: 10px;
    align-items: center;
    max-width: 920px; margin-left: auto; margin-right: auto;
}
.sd-hud-cell {
    padding: 6px 10px;
    background: #fdf6e3;
    border: 1px solid var(--sd-paper-3);
    border-radius: 8px;
    font-size: 14px; font-weight: 600;
    color: var(--sd-ink);
    display: inline-flex; align-items: center; gap: 5px;
}
.sd-hud-cell i { font-size: 15px; color: var(--sd-vermilion); }
.sd-time-cell { min-width: 80px; }
.sd-hud-btn {
    margin-left: auto;
    padding: 6px 10px;
    background: #fdf6e3;
    border: 1px solid var(--sd-paper-3);
    border-radius: 8px;
    font-size: 14px; font-weight: 600;
    color: var(--sd-ink);
    cursor: pointer;
    display: inline-flex; align-items: center; gap: 4px;
    font-family: inherit;
}
.sd-hud-btn:hover { background: var(--sd-paper-2); }
.sd-hud-btn:disabled { opacity: .4; cursor: not-allowed; }
#btnQuit { margin-left: 4px; }

/* ============ 图片对 ============ */
.sd-images {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    max-width: 920px; margin: 0 auto;
}
@media (min-width: 720px) {
    .sd-images { grid-template-columns: 1fr 1fr; }
}

.sd-img-wrap {
    position: relative;
    background: #fff;
    border: 1px solid var(--sd-paper-3);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--sd-shadow);
    aspect-ratio: 1 / 1;
    user-select: none;
    -webkit-user-select: none;
    cursor: crosshair;
}
.sd-img {
    width: 100%; height: 100%;
    display: block;
    object-fit: cover;
    pointer-events: none;
    user-select: none;
    -webkit-user-drag: none;
}
.sd-marks {
    position: absolute; inset: 0;
    pointer-events: none;
}
.sd-label {
    position: absolute;
    top: 6px; left: 8px;
    background: rgba(26,20,16,.65);
    color: #fdf6e3;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    letter-spacing: 2px;
}

/* 命中标记 */
.sd-mark {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    box-sizing: border-box;
}
.sd-mark.found {
    border: 3px solid var(--sd-green);
    background: rgba(22,163,74,.18);
    animation: sd-pop .35s cubic-bezier(.34,1.56,.64,1);
}
.sd-mark.miss {
    border: 3px solid var(--sd-vermilion);
    background: rgba(185,28,28,.18);
    animation: sd-shake .4s ease;
}
.sd-mark.hint {
    border: 3px dashed var(--sd-gold);
    background: rgba(184,134,11,.15);
    animation: sd-pulse 1.2s ease-in-out 2;
}
@keyframes sd-pop {
    0%   { transform: translate(-50%, -50%) scale(0); }
    60%  { transform: translate(-50%, -50%) scale(1.2); }
    100% { transform: translate(-50%, -50%) scale(1); }
}
@keyframes sd-shake {
    0%,100% { transform: translate(-50%, -50%) scale(1); }
    25%     { transform: translate(-44%, -50%) scale(1.05); }
    75%     { transform: translate(-56%, -50%) scale(1.05); }
}
@keyframes sd-pulse {
    0%,100% { box-shadow: 0 0 0 0 rgba(184,134,11,.6); }
    50%     { box-shadow: 0 0 0 8px rgba(184,134,11,0); }
}

/* ============ Toast ============ */
.sd-toast {
    position: fixed; left: 50%; top: 80px;
    transform: translateX(-50%) translateY(-12px);
    padding: 8px 16px;
    background: var(--sd-ink);
    color: #fdf6e3;
    border-radius: 8px;
    font-size: 14px;
    box-shadow: 0 4px 14px rgba(0,0,0,.25);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s, transform .2s;
    z-index: 100;
}
.sd-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============ 战绩 ============ */
.sd-result-card {
    max-width: 380px;
    margin: 12px auto;
    background: #fdf6e3;
    border: 2px solid var(--sd-paper-3);
    border-radius: 14px;
    padding: 22px 22px 18px;
    text-align: center;
    box-shadow: var(--sd-shadow);
}
.sd-result-seal {
    display: inline-block;
    padding: 4px 14px;
    background: var(--sd-vermilion);
    color: #fdf6e3;
    border-radius: 4px;
    font-size: 13px; letter-spacing: 4px;
    margin-bottom: 10px;
    font-weight: 600;
}
.sd-result-level {
    font-size: 18px; font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: 2px;
}
.sd-result-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 14px;
}
.sd-result-stat {
    background: rgba(244,236,216,.5);
    border-radius: 8px;
    padding: 8px 4px;
}
.sd-result-num {
    font-size: 22px; font-weight: 700;
    color: var(--sd-vermilion);
}
.sd-result-label {
    font-size: 12px;
    color: var(--sd-ink-3);
}
.sd-result-best {
    font-size: 13px; color: var(--sd-gold);
    margin-bottom: 12px;
    min-height: 18px;
}
.sd-result-actions {
    display: flex; gap: 8px; justify-content: center;
}
.sd-btn {
    padding: 9px 16px;
    background: #fff;
    border: 1px solid var(--sd-paper-3);
    border-radius: 9px;
    color: var(--sd-ink);
    font-size: 14px; font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    min-width: 100px;
}
.sd-btn:hover { background: var(--sd-paper-2); }
.sd-btn.primary {
    background: var(--sd-vermilion);
    border-color: var(--sd-vermilion-d);
    color: #fdf6e3;
}
.sd-btn.primary:hover { background: #a01717; }

/* ============ 移动端 ============ */
@media (max-width: 520px) {
    .sd-intro-title { font-size: 22px; letter-spacing: 3px; }
    .sd-hud-cell { font-size: 13px; padding: 5px 8px; }
    .sd-hud-btn { font-size: 13px; padding: 5px 8px; }
}