/* ==========================================================================
   《植物大战僵尸：数学大作战》少儿高质感 1:1 原版对标设计系统
   包含：900x600 无畸变原版草坪、60fps DOM GIF 实体动画层、原版 Seed Bank、shuxue 双Tab档案设置
   ========================================================================== */

:root {
    --c-grass-sky: #70a1ff;
    --c-grass-top: #2ed573;
    --c-grass-bottom: #10ac84;
    --c-wood-main: #795548;
    --c-wood-dark: #4e342e;
    --c-wood-light: #a1887f;
    --c-sun-gold: #f1c40f;
    --c-chalkboard: #2c3e50;
    --c-font-family: 'Fredoka', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-user-select: none;
    font-family: var(--c-font-family);
}

body {
    background: linear-gradient(180deg, #74b9ff 0%, #a8e6cf 45%, #1dd1a1 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 8px 12px;
    overflow-x: hidden;
    color: #2d3436;
}

#game-app {
    width: 100%;
    max-width: 1320px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* ================= 1. 顶部原木 HUD 状态栏 ================= */
.wood-hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(180deg, #8d6e63 0%, #6d4c41 50%, #4e342e 100%);
    border: 4px solid #3e2723;
    border-radius: 20px;
    padding: 8px 18px;
    box-shadow: 
        0 6px 0 #2d1810,
        0 12px 24px rgba(0, 0, 0, 0.3),
        inset 0 2px 0 rgba(255, 255, 255, 0.3);
    position: relative;
    z-index: 20;
    min-height: 60px;
}

.hud-left-group, .hud-center-group, .hud-right-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-jelly-pill, .hud-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #ffffff;
    border: 3px solid #4e342e;
    border-radius: 26px;
    padding: 6px 14px;
    box-shadow: 0 4px 0 #3e2723;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
}

.btn-jelly-pill:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #3e2723;
}

.btn-jelly-user {
    background: #fff9db;
    border-color: #f59f00;
}

.btn-jelly-records {
    background: #e7f5ff;
    border-color: #339af0;
}

.hud-pill-lives {
    background: #ffe3e3;
    border-color: #e03131;
    color: #c92a2a;
}

/* 水银波次进度条 */
.syringe-tube {
    width: 140px;
    height: 18px;
    background: #2b2b2b;
    border: 3px solid #4e342e;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.6);
}

.syringe-fluid {
    height: 100%;
    background: linear-gradient(90deg, #f1c40f 0%, #e67e22 50%, #e74c3c 100%);
    border-radius: 10px;
    transition: width 0.4s ease;
}

.hud-pill-wave-capsule {
    background: #ffffff;
    border: 3px solid #4e342e;
    border-radius: 16px;
    padding: 4px 10px;
    font-size: 14px;
    font-weight: 900;
}

.combo-badge {
    background: linear-gradient(135deg, #ff793f, #ff3838);
    color: #fff;
    border: 2.5px solid #fff;
    border-radius: 20px;
    padding: 4px 10px;
    font-size: 14px;
    font-weight: 900;
    box-shadow: 0 3px 0 #b33939;
    animation: pulse 1s infinite alternate;
}

@keyframes pulse {
    from { transform: scale(1); }
    to { transform: scale(1.08); }
}

.btn-jelly-circle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #ffffff;
    border: 3px solid #4e342e;
    box-shadow: 0 4px 0 #3e2723;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.1s;
}

.btn-jelly-circle:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #3e2723;
}

/* ================= 2. 主舞台视窗 (战区 + 黑板) ================= */
.main-stage {
    display: flex;
    gap: 14px;
    width: 100%;
    align-items: flex-start;
}

.battlefield-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* 原版 1:1 植物卡牌银行 (Seed Bank: 阳光数显 + 卡槽 + 铲子座) */
.seed-bank-bar {
    display: flex;
    align-items: center;
    background: linear-gradient(180deg, #6d4c41 0%, #4e342e 100%);
    border: 3.5px solid #3e2723;
    border-radius: 14px;
    padding: 4px 8px;
    box-shadow: 0 5px 0 #2d1810;
    gap: 8px;
}

.sun-bank-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 70px;
    height: 72px;
    background: #3e2723;
    border: 2.5px solid #8d6e63;
    border-radius: 8px;
    color: #f1c40f;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.5);
}

.sun-bank-icon {
    font-size: 24px;
    animation: sunSpin 10s linear infinite;
}

.sun-bank-val {
    font-size: 16px;
    font-weight: 900;
}

@keyframes sunSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.cards-list {
    display: flex;
    gap: 5px;
    flex: 1;
    overflow-x: auto;
}

.plant-card {
    width: 50px;
    height: 70px;
    border-radius: 5px;
    cursor: pointer;
    position: relative;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.45);
    transition: transform 0.12s, box-shadow 0.12s;
    overflow: hidden;
    flex-shrink: 0;
    user-select: none;
    background: #3e2723;
}

.plant-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.55);
}

.plant-card.selected {
    box-shadow: 0 0 0 2.5px #f1c40f, 0 4px 12px rgba(241, 196, 15, 0.7);
    transform: translateY(-4px);
}

.plant-card.disabled {
    filter: brightness(0.55) grayscale(0.7);
    cursor: not-allowed;
}

.card-seed-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.card-cooldown-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: rgba(0, 0, 0, 0.65);
    z-index: 5;
    pointer-events: none;
    transition: height 0.05s linear;
}

.card-conveyor-tag {
    position: absolute;
    top: 2px;
    right: 2px;
    background: #e74c3c;
    color: #fff;
    font-size: 10px;
    font-weight: 900;
    padding: 1px 4px;
    border-radius: 4px;
    z-index: 6;
}

.plant-card.conveyor-card {
    border: 2px solid #b8860b;
    background: linear-gradient(135deg, #f7d794, #f5cd79);
    animation: conveyorSlideIn 0.28s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.35);
}

.plant-card.conveyor-card.selected {
    border-color: #f1c40f !important;
    transform: scale(1.08) translateY(-4px);
    box-shadow: 0 0 14px #f1c40f, 0 4px 10px rgba(0, 0, 0, 0.4) !important;
}

@keyframes conveyorSlideIn {
    0% { transform: translateX(20px) scale(0.85); opacity: 0; }
    100% { transform: translateX(0) scale(1); opacity: 1; }
}

.card-sleep-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    background: rgba(30, 39, 46, 0.92);
    color: #f1c40f;
    font-size: 10px;
    font-weight: 900;
    padding: 1px 4px;
    border-radius: 4px;
    border: 1px solid rgba(241, 196, 15, 0.7);
    z-index: 6;
    pointer-events: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.plant-card.plant-card-sleep {
    filter: brightness(0.85);
    border-color: #5c6bc0;
}

.shovel-bank-slot {
    width: 68px;
    height: 72px;
    background: linear-gradient(145deg, #4e342e, #2d1810);
    border: 2.5px solid #8d6e63;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.6), 0 3px 0 #1b0000;
    transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.shovel-bank-slot:hover {
    transform: translateY(-2px);
    border-color: #d7ccc8;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4), 0 5px 0 #1b0000;
}

.shovel-bank-slot.active {
    border-color: #ff5252;
    background: linear-gradient(145deg, #5d2525, #3a1414);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.6), 0 0 12px #ff5252, 0 3px 0 #1b0000;
    transform: translateY(-3px);
}

.shovel-bank-slot img {
    width: 62px;
    height: auto;
    transform: rotate(-45deg);
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.6));
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    user-select: none;
    -webkit-user-drag: none;
}

.shovel-bank-slot:hover img {
    transform: rotate(-40deg) scale(1.08);
}

.shovel-bank-slot.active img {
    transform: rotate(-25deg) scale(1.15);
    filter: drop-shadow(0 0 8px #ff5252);
}

/* 前景阳光层 (保证阳光永远覆盖在植物和僵尸最上方) */
.sun-layer {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 60;
    pointer-events: none;
}

.sun-entity {
    position: absolute;
    width: 78px;
    height: 78px;
    pointer-events: auto;
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
    will-change: transform, opacity;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 10px rgba(255, 230, 0, 0.85));
    transition: filter 0.15s;
}

.sun-entity:hover {
    filter: drop-shadow(0 0 18px rgba(255, 240, 50, 1.0)) brightness(1.15);
}

.sun-entity.super-sun {
    width: 96px;
    height: 96px;
    filter: drop-shadow(0 0 20px rgba(255, 215, 0, 0.95)) drop-shadow(0 0 6px #e67e22);
}

.sun-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    pointer-events: none;
}

.sun-badge {
    position: absolute;
    bottom: -2px;
    background: rgba(0, 0, 0, 0.65);
    color: #fff;
    font-weight: 900;
    font-size: 13px;
    padding: 1px 6px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    pointer-events: none;
    text-shadow: 0 1px 2px #000;
}

/* 核心战场视窗 (900x600 严格对标原版) */
.canvas-container {
    width: 900px;
    height: 600px;
    max-width: 100%;
    aspect-ratio: 900 / 600;
    background: #1e272e;
    border: 4px solid #3e2723;
    border-radius: 16px;
    box-shadow: 0 8px 0 #2d1810, 0 16px 30px rgba(0,0,0,0.35);
    overflow: hidden;
    position: relative;
}

#battleCanvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: 1;
}

/* 实体 60fps 动态 GIF 动画图层 */
.entity-layer {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

.plant-entity {
    position: absolute;
    pointer-events: auto;
    width: 76px;
    height: 80px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    transition: transform 0.15s ease-out;
    z-index: 10;
}

/* 荷叶底座规格与层级：稳稳居于水波之中作为托盘 */
.plant-entity.plant-lilypad {
    width: 82px !important;
    height: 56px !important;
    align-items: center !important;
    justify-content: center !important;
    z-index: 4 !important;
}

.plant-entity.plant-lilypad .plant-gif {
    width: 82px !important;
    height: 56px !important;
    object-fit: contain;
    filter: drop-shadow(0 2px 5px rgba(0, 45, 90, 0.45));
}

/* 稳稳立在荷叶之上的植物实体 */
.plant-entity.planted-on-lilypad {
    z-index: 15 !important;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.35));
}

/* 花盆与盆栽植物 */
.plant-entity.plant-flowerpot .plant-gif {
    width: 82px !important;
    height: 62px !important;
    object-fit: contain;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.4));
}

.plant-entity.planted-on-pot {
    z-index: 15 !important;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.35));
}

/* 南瓜头铠甲外壳 */
.plant-entity.plant-pumpkin {
    z-index: 18 !important;
}

.plant-entity.plant-pumpkin .plant-gif {
    width: 86px !important;
    height: 82px !important;
    object-fit: contain;
}

.plant-gif {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.35));
}

.plant-entity.super-gatling {
    filter: drop-shadow(0 0 12px #f1c40f);
}

.plant-entity.is-asleep .plant-gif {
    filter: brightness(0.72) contrast(0.92);
}

.plant-entity.plant-sunflower.is-asleep .plant-gif,
.plant-entity.plant-peashooter.is-asleep .plant-gif,
.plant-entity.plant-snowpea.is-asleep .plant-gif,
.plant-entity.plant-repeater.is-asleep .plant-gif,
.plant-entity.plant-chomper.is-asleep .plant-gif {
    transform: rotate(-10deg) translateY(4px) scale(0.94);
    transform-origin: bottom center;
}

.plant-zzz-bubble {
    position: absolute;
    top: -16px;
    right: 4px;
    font-size: 13px;
    font-weight: 900;
    color: #f1c40f;
    text-shadow: 0 0 3px #000, 1px 1px 2px #000;
    pointer-events: none;
    display: flex;
    align-items: baseline;
    gap: 2px;
    z-index: 25;
    animation: zzzDrift 2.2s infinite ease-in-out;
}
.plant-zzz-bubble span:nth-child(1) { font-size: 10px; opacity: 0.6; }
.plant-zzz-bubble span:nth-child(2) { font-size: 13px; opacity: 0.85; }
.plant-zzz-bubble span:nth-child(3) { font-size: 17px; opacity: 1.0; }

@keyframes zzzDrift {
    0% { transform: translate(0, 0) rotate(-4deg); opacity: 0.5; }
    50% { transform: translate(3px, -7px) rotate(6deg); opacity: 1; }
    100% { transform: translate(0, 0) rotate(-4deg); opacity: 0.5; }
}

.zombie-entity {
    position: absolute;
    pointer-events: none;
    width: 166px;
    height: 144px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    will-change: left, top;
}

.zombie-gif {
    width: 166px;
    height: 144px;
    object-fit: contain;
}

.zombie-entity.hit-flash {
    filter: brightness(2) contrast(1.3);
}

.zombie-entity.slowed {
    filter: drop-shadow(0 0 10px #3498db) hue-rotate(180deg);
}

.zombie-entity.frozen {
    filter: brightness(0.9) saturate(1.8) hue-rotate(170deg) drop-shadow(0 0 14px #00d2d3);
}

.zombie-entity.charred-die {
    z-index: 25 !important;
}

.zombie-entity.charred-die .zombie-gif {
    filter: drop-shadow(0 0 12px rgba(0, 0, 0, 0.85));
    animation: ash-disintegrate 2.4s forwards ease-in-out;
}

@keyframes ash-disintegrate {
    0% { opacity: 1; transform: scale(1); filter: brightness(1); }
    85% { opacity: 0.95; transform: scale(1); filter: brightness(0.8); }
    100% { opacity: 0; transform: scale(0.96) translateY(6px); filter: brightness(0.2); }
}

.shield-badge {
    display: none !important;
}

.head-drop-entity {
    position: absolute;
    pointer-events: none;
    width: 70px;
    height: 70px;
    animation: headFall 0.8s ease-in forwards;
}

.head-gif {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

@keyframes headFall {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(45px) rotate(180deg); opacity: 0; }
}

/* 击飞掉落路障与铁桶动画 */
.armor-drop-entity {
    position: absolute;
    pointer-events: none;
    width: 55px;
    height: 48px;
    animation: armorDropFly 0.75s cubic-bezier(0.2, 0.8, 0.4, 1) forwards;
    z-index: 15;
}

.armor-drop-entity img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

@keyframes armorDropFly {
    0% {
        transform: translate(0, 0) rotate(0deg) scale(1);
        opacity: 1;
    }
    35% {
        transform: translate(25px, -35px) rotate(45deg) scale(1.1);
        opacity: 1;
    }
    100% {
        transform: translate(65px, 55px) rotate(160deg) scale(0.85);
        opacity: 0;
    }
}

/* 大嘴花/霸王花特殊规格 */
.plant-entity.plant-chomper {
    width: 130px !important;
    height: 114px !important;
}

.plant-entity.plant-chomper .plant-gif {
    width: 130px !important;
    height: 114px !important;
    object-fit: contain;
}

/* 资源加载动画 */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(44, 62, 80, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.loading-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: #fff;
}

.loading-sun {
    font-size: 56px;
    animation: sunSpin 6s linear infinite;
}

.loading-title {
    font-size: 22px;
    font-weight: 900;
}

.loading-bar-wrap {
    width: 260px;
    height: 16px;
    background: #1a252f;
    border: 3px solid #fff;
    border-radius: 12px;
    overflow: hidden;
}

.loading-bar-fill {
    height: 100%;
    background: #2ecc71;
    border-radius: 10px;
    transition: width 0.2s;
}

.loading-hint {
    font-size: 14px;
    color: #bdc3c7;
}

/* ================= 3. 右侧：智慧小黑板算术法阵 ================= */
.chalkboard-card {
    width: 340px;
    background: linear-gradient(180deg, #34495e 0%, #2c3e50 100%);
    border: 4px solid #4e342e;
    border-radius: 20px;
    padding: 12px;
    box-shadow: 0 8px 0 #2d1810, 0 14px 26px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    gap: 10px;
    color: #fff;
    flex-shrink: 0;
}

.chalkboard-mascots {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    padding: 6px 12px;
}

.mascot-emoji {
    font-size: 26px;
    display: inline-block;
    animation: bounce 1.2s infinite alternate;
}

@keyframes bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-4px); }
}

.mascot-talk {
    font-size: 13px;
    font-weight: 800;
    color: #f1c40f;
}

.blackboard-inner {
    background: #1a252f;
    border: 3px dashed rgba(255, 255, 255, 0.35);
    border-radius: 14px;
    padding: 12px 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.bb-hint {
    font-size: 13px;
    color: #1abc9c;
    font-weight: 800;
}

.bb-formula {
    font-size: 38px;
    font-weight: 900;
    color: #ffffff;
    letter-spacing: 2px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

.bb-answer-box {
    display: flex;
    gap: 8px;
    width: 100%;
}

.bb-input {
    flex: 1;
    min-width: 0;
    background: #ffffff;
    border: 3.5px solid #2ecc71;
    border-radius: 14px;
    padding: 8px 10px;
    font-size: 22px;
    font-weight: 900;
    color: #2c3e50;
    text-align: center;
    outline: none;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.15);
}

.bb-btn-confirm {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    border: 3px solid #1e8449;
    border-radius: 14px;
    color: #fff;
    font-size: 16px;
    font-weight: 900;
    padding: 0 14px;
    cursor: pointer;
    box-shadow: 0 4px 0 #145a32;
    transition: transform 0.1s;
    white-space: nowrap;
    flex-shrink: 0;
}

.bb-btn-confirm:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #145a32;
}

.bb-feedback {
    font-size: 12px;
    color: #f1c40f;
    text-align: center;
    min-height: 18px;
    font-weight: 800;
}

.cookie-keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.cookie-key {
    background: linear-gradient(180deg, #ffffff 0%, #ecf0f1 100%);
    border: 3px solid #bdc3c7;
    border-radius: 14px;
    padding: 12px 0;
    font-size: 24px;
    font-weight: 900;
    color: #2c3e50;
    box-shadow: 0 4px 0 #95a5a6;
    cursor: pointer;
    transition: transform 0.08s, box-shadow 0.08s;
}

.cookie-key:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #95a5a6;
}

.cookie-key-action {
    background: #ffecb3;
    border-color: #ffd54f;
    box-shadow: 0 4px 0 #ffca28;
    font-size: 16px;
}

.bb-kid-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 12px;
    padding: 8px 12px;
    margin-top: 4px;
}

.bb-kid-info {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 800;
}

.bb-diff-tag {
    background: #3498db;
    border-radius: 8px;
    padding: 2px 6px;
    font-size: 11px;
}

.btn-bb-gear {
    background: #48dbfb;
    border: 2px solid #0abde3;
    border-radius: 10px;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 800;
    color: #fff;
    cursor: pointer;
}

/* ================= 4. 模态弹窗系统 (原木大卡片) ================= */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.wood-modal-card {
    background: linear-gradient(180deg, #8d6e63 0%, #5d4037 100%);
    border: 5px solid #3e2723;
    border-radius: 24px;
    padding: 20px 24px;
    width: 90%;
    max-width: 680px;
    box-shadow: 0 12px 0 #2d1810, 0 24px 40px rgba(0, 0, 0, 0.5);
    color: #fff;
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-title {
    font-size: 24px;
    font-weight: 900;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

.modal-desc {
    font-size: 13px;
    color: #f1c40f;
    text-align: center;
    margin-top: -6px;
}

/* ================= 5. 小朋友档案与难度设置 (完全对标 shuxue) ================= */
.kid-profiles-bar-wrapper {
    background: rgba(0,0,0,0.25);
    border-radius: 14px;
    padding: 8px 12px;
}

.kid-profiles-bar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.kid-bar-title {
    font-size: 14px;
    font-weight: 800;
    color: #bdc3c7;
}

.btn-add-kid-pill {
    background: linear-gradient(135deg, #00b894, #00cec9);
    border: 2px solid #00a884;
    border-radius: 20px;
    color: #fff;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 800;
    cursor: pointer;
}

.kid-profiles-chips-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.kid-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #ffffff;
    color: #2c3e50;
    border: 2.5px solid #bdc3c7;
    border-radius: 18px;
    padding: 4px 12px;
    font-size: 14px;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 2px 0 #7f8c8d;
    transition: transform 0.1s;
}

.kid-chip.active {
    border-color: #2ecc71;
    background: #e8f8f5;
    box-shadow: 0 0 8px #2ecc71, 0 2px 0 #27ae60;
}

.profile-kid-card {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.profile-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.profile-edit-mode-tag {
    font-size: 15px;
    font-weight: 900;
    color: #f1c40f;
}

.btn-del-kid {
    background: #e74c3c;
    border: 1.5px solid #c0392b;
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 11px;
    color: #fff;
    cursor: pointer;
}

.profile-row-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.profile-label {
    font-size: 14px;
    font-weight: 800;
    width: 105px;
    flex-shrink: 0;
}

.profile-name-input {
    flex: 1;
    background: #ffffff;
    border: 2.5px solid #2ecc71;
    border-radius: 10px;
    padding: 6px 12px;
    font-size: 16px;
    font-weight: 800;
    outline: none;
    color: #2c3e50;
}

.avatar-select-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
    flex: 1;
}

.avatar-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #ffffff;
    border: 2px solid #bdc3c7;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.1s;
}

.avatar-btn.selected {
    border-color: #2ecc71;
    background: #e8f8f5;
    transform: scale(1.15);
    box-shadow: 0 0 8px #2ecc71;
}

/* 选项卡双头 */
.profile-tab-header {
    display: flex;
    gap: 10px;
    margin-top: 4px;
}

.profile-tab-btn {
    flex: 1;
    background: #3e2723;
    border: 2px solid #5d4037;
    border-radius: 12px;
    color: #bdc3c7;
    padding: 8px 0;
    font-size: 14px;
    font-weight: 900;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.profile-tab-btn.active {
    background: #2ecc71;
    border-color: #27ae60;
    color: #fff;
    box-shadow: 0 3px 0 #1e8449;
}

.profile-tab-content {
    background: rgba(0,0,0,0.25);
    border-radius: 14px;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.setting-block {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.setting-title {
    font-size: 13px;
    font-weight: 800;
    color: #f1c40f;
}

.ops-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.op-checkbox-label {
    cursor: pointer;
}

.op-checkbox-label input {
    display: none;
}

.op-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: #ffffff;
    color: #2c3e50;
    border: 2px solid #bdc3c7;
    border-radius: 10px;
    padding: 6px 0;
    font-weight: 900;
    transition: border-color 0.15s;
}

.op-checkbox-label input:checked + .op-box {
    border-color: #2ecc71;
    background: #e8f8f5;
    color: #27ae60;
}

.ranges-grid {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.range-pill, .range-pill-btn {
    background: #ffffff;
    color: #2c3e50;
    border: 2px solid #bdc3c7;
    border-radius: 14px;
    padding: 6px 14px;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    outline: none;
}

.range-pill:hover, .range-pill-btn:hover {
    border-color: #3498db;
    background: #f0f7fc;
}

.range-pill.selected, .range-pill-btn.selected {
    border-color: #2ecc71 !important;
    background: #e8f8f5 !important;
    color: #27ae60 !important;
    font-weight: 900;
    box-shadow: 0 0 10px rgba(46, 204, 113, 0.45);
    transform: scale(1.05);
}

.extra-toggles-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.toggle-option-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
}

.preset-grade-cards {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.preset-card, .diff-card {
    background: #ffffff;
    color: #2c3e50;
    border: 2.5px solid #bdc3c7;
    border-radius: 14px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
}

.preset-card:hover, .diff-card:hover {
    border-color: #3498db;
    background: #f7fbfe;
}

.preset-card.selected, .diff-card.selected {
    border-color: #2ecc71 !important;
    background: #e8f8f5 !important;
    box-shadow: 0 0 12px rgba(46, 204, 113, 0.5);
    transform: scale(1.02);
}

.preset-title, .diff-card-title {
    font-size: 15px;
    font-weight: 900;
    color: #2c3e50;
}

.preset-desc, .diff-card-desc {
    font-size: 12px;
    color: #7f8c8d;
    margin-top: 4px;
    line-height: 1.4;
}

/* ================= 6. 答题战报与错题本 ================= */
.records-kid-selector {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.records-tab-content {
    background: rgba(0,0,0,0.25);
    border-radius: 14px;
    padding: 12px;
    max-height: 260px;
    overflow-y: auto;
}

.history-list-box, .mistakes-list-box {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item-row, .mistake-item-row {
    background: #ffffff;
    color: #2c3e50;
    border-radius: 10px;
    padding: 8px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 800;
}

.mistake-item-row {
    border-left: 5px solid #e74c3c;
}

.history-item-row {
    border-left: 5px solid #2ecc71;
}

/* 关卡网格 */
.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(115px, 1fr));
    gap: 10px;
    max-height: 56vh;
    overflow-y: auto;
    padding-right: 6px;
}

.level-card {
    background: #ffffff;
    color: #2c3e50;
    border: 3px solid #7f8c8d;
    border-radius: 12px;
    padding: 10px 6px;
    text-align: center;
    cursor: pointer;
    box-shadow: 0 3px 0 #3e2723;
    transition: transform 0.1s, border-color 0.15s;
}

.level-card:hover {
    transform: translateY(-2px);
    border-color: #f1c40f;
}

.level-card.active {
    border-color: #2ecc71;
    background: #e8f8f5;
    box-shadow: 0 0 10px #2ecc71;
}

.level-card-id {
    font-size: 18px;
    font-weight: 900;
    color: #e67e22;
}

.level-card-name {
    font-size: 12px;
    font-weight: 800;
    margin-top: 2px;
}

.btn-big-wood {
    background: linear-gradient(135deg, #f1c40f, #e67e22);
    border: 3.5px solid #d35400;
    border-radius: 16px;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 900;
    color: #fff;
    cursor: pointer;
    box-shadow: 0 4px 0 #a04000;
    align-self: center;
    transition: transform 0.1s;
}

.btn-big-wood:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #a04000;
}

/* 结算卡片 */
.victory-card, .defeat-card {
    text-align: center;
    align-items: center;
}

.victory-trophy-icon, .defeat-icon {
    font-size: 56px;
}

.reward-box {
    background: #fff9db;
    border: 3px solid #f59f00;
    border-radius: 14px;
    padding: 10px 18px;
    color: #d9480f;
    width: 100%;
}

.reward-title {
    font-size: 14px;
    font-weight: 900;
}

.reward-text {
    font-size: 16px;
    font-weight: 900;
    margin-top: 2px;
}

.report-stats {
    display: flex;
    justify-content: space-around;
    width: 100%;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 12px;
    padding: 10px 6px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.stat-label {
    font-size: 11px;
    color: #bdc3c7;
}

.stat-val {
    font-size: 18px;
    font-weight: 900;
    color: #f1c40f;
}

.profile-modal-card {
    max-height: 94vh;
    padding: 16px 22px;
    gap: 10px;
}

.modal-actions-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    width: 100%;
    position: sticky;
    bottom: -20px;
    background: linear-gradient(180deg, rgba(93, 64, 55, 0.95), #5d4037);
    padding: 10px 0 6px 0;
    border-top: 1.5px solid rgba(255, 255, 255, 0.2);
    border-radius: 0 0 18px 18px;
    z-index: 20;
}

@media (max-width: 900px) {
    .main-stage {
        flex-direction: column;
    }
    .chalkboard-card {
        width: 100%;
    }
}

/* ==========================================================================
   iPadOS / iOS 独立应用 (PWA Standalone) 与网页全屏 (Fullscreen) 专属适配
   ========================================================================== */
@media all and (display-mode: standalone), (display-mode: fullscreen) {
    body {
        padding-top: max(8px, env(safe-area-inset-top));
        padding-bottom: max(8px, env(safe-area-inset-bottom));
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
        min-height: 100dvh;
    }
}

:fullscreen, :-webkit-full-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #74b9ff 0%, #a8e6cf 45%, #1dd1a1 100%);
}

:fullscreen #game-app, :-webkit-full-screen #game-app {
    width: 100%;
    max-width: 1320px;
    height: 100%;
    justify-content: center;
}