/* ===== 卡通可爱 + 全屏铺满 主题 ===== */
:root {
    --candy-blue: #6ec6ff;
    --candy-blue-d: #4aa3ec;
    --candy-green: #7ed957;
    --candy-green-d: #57b894;
    --candy-yellow: #ffd66b;
    --candy-pink: #ff9ec4;
    --candy-purple: #b79cff;
    --ink: #4a4a6a;
    --ink-soft: #7a7a9a;
    --bg1: #fff7fb;
    --bg2: #eef6ff;
    --card: #ffffff;
    --radius: 22px;
    --shadow: 0 8px 24px rgba(120, 140, 200, .15);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Comic Sans MS", "Baloo 2", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    color: var(--ink);
    background: linear-gradient(135deg, var(--bg1), var(--bg2));
    min-height: 100vh;
}

/* ===== 顶部导航 ===== */
header {
    display: flex; align-items: center; justify-content: space-between;
    background: linear-gradient(90deg, var(--candy-blue), var(--candy-purple));
    color: #fff; padding: 0 28px; height: 64px;
    box-shadow: 0 4px 16px rgba(150, 130, 220, .25);
}
header .brand { font-weight: 800; font-size: 20px; letter-spacing: .5px; }
header nav a { color: #fff; text-decoration: none; margin-left: 18px; font-size: 15px; padding: 6px 10px; border-radius: 14px; transition: .15s; }
header nav a:hover { background: rgba(255,255,255,.25); }
header nav .user { margin-left: 16px; opacity: .95; font-weight: 600; }

/* ===== 内容区：全屏铺满 ===== */
main {
    max-width: 1180px;
    width: 100%;
    margin: 26px auto;
    padding: 0 22px;
}

.flash { list-style: none; background: #fff3d6; padding: 10px 18px; border-radius: 14px; color: #8a6d00; box-shadow: var(--shadow); }

.card {
    background: var(--card); border-radius: var(--radius);
    padding: 28px; box-shadow: var(--shadow); margin-bottom: 22px;
    border: 3px solid #fef0f7;
}
.card h2 { margin-top: 0; color: var(--candy-blue-d); }
.card h3 { color: var(--candy-green-d); }

/* ===== 首页 hero ===== */
.hero { text-align: center; padding: 46px 0 26px; }
.hero h1 { font-size: 34px; color: var(--candy-blue-d); margin: 0 0 12px; text-shadow: 2px 2px 0 #fff; }
.hero p { font-size: 17px; color: var(--ink-soft); margin: 0 0 22px; }

/* ===== 模式选择网格 ===== */
.mode-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.mode-card {
    background: linear-gradient(135deg, #ffffff, #f3f8ff);
    border-radius: var(--radius); padding: 30px 24px;
    text-decoration: none; color: var(--ink); box-shadow: var(--shadow);
    transition: .18s; border: 3px solid #eaf2ff; text-align: center;
}
.mode-card:hover { transform: translateY(-6px) scale(1.02); border-color: var(--candy-blue); box-shadow: 0 12px 30px rgba(110,198,255,.35); }
.mode-card h3 { margin: 0 0 8px; color: var(--candy-blue-d); font-size: 22px; }
.mode-card p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* ===== 按钮 ===== */
.btn, button {
    background: linear-gradient(135deg, var(--candy-blue), var(--candy-blue-d));
    color: #fff; border: none; padding: 12px 22px; border-radius: 16px;
    cursor: pointer; text-decoration: none; display: inline-block; font-size: 15px;
    font-weight: 700; box-shadow: 0 4px 0 rgba(74,163,236,.5); transition: .12s;
}
.btn:hover, button:hover { transform: translateY(-2px); }
.btn:active, button:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(74,163,236,.5); }
.btn.primary { background: linear-gradient(135deg, var(--candy-green), var(--candy-green-d)); box-shadow: 0 4px 0 rgba(87,184,148,.5); }
.link { background: none; color: var(--candy-blue-d); padding: 6px 10px; font-weight: 700; box-shadow: none; }
.link:hover { transform: none; text-decoration: underline; }

input[type=text], input[type=password] {
    padding: 13px 16px; border: 2px solid #e3e9f5; border-radius: 14px;
    width: 100%; margin: 8px 0; font-size: 16px; background: #fbfdff; color: var(--ink);
}
input[type=text]:focus, input[type=password]:focus { outline: none; border-color: var(--candy-blue); }

.field { margin: 18px 0; }
.field .label { display: block; font-weight: 700; margin-bottom: 8px; color: var(--ink); }

/* ===== 选择 chips ===== */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
    background: #f3f7ff; padding: 9px 16px; border-radius: 20px;
    font-size: 14px; cursor: pointer; border: 2px solid #e3e9f5; transition: .12s;
    user-select: none;
}
.chip:hover { border-color: var(--candy-blue); }
.chip input { margin-right: 6px; vertical-align: middle; }
.chip:has(input:checked) { background: var(--candy-yellow); border-color: #f4c430; color: #7a5a00; font-weight: 700; }

/* ===== 练习页：占满 + 卡通 ===== */
.practice-wrap { min-height: calc(100vh - 64px - 52px); display: flex; align-items: center; justify-content: center; padding: 20px; }
.card.practice-card {
    max-width: 760px; width: 100%; text-align: center;
    background: linear-gradient(160deg, #ffffff, #fef6ff);
    border: 4px solid #ffe2f1;
}
.pc-head { display: flex; align-items: center; gap: 10px; justify-content: center; margin-bottom: 18px; flex-wrap: wrap; }
.badge { background: var(--candy-blue); color: #fff; padding: 5px 14px; border-radius: 16px; font-size: 14px; font-weight: 700; }
.badge.gray { background: #b9c2d8; }
.prompt { font-size: 30px; font-weight: 800; margin: 22px 0; color: var(--ink); }
.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 560px; margin: 0 auto; }
.choice {
    background: #f3f7ff; color: var(--ink); border: 2px solid #dce4f5;
    padding: 16px; border-radius: 16px; font-size: 17px; cursor: pointer; text-align: center;
    font-weight: 600; transition: .12s;
}
.choice:hover { background: #e2ecff; border-color: var(--candy-blue); transform: translateY(-2px); }
.choice:active { background: #d4e0ff; }
.speak-btn, .rec-btn {
    margin: 10px; padding: 14px 24px; border-radius: 18px;
    background: linear-gradient(135deg, var(--candy-yellow), #f4b740); color: #7a5a00;
    border: none; cursor: pointer; font-size: 16px; font-weight: 800;
    box-shadow: 0 4px 0 rgba(244,183,64,.6); transition: .12s;
}
.speak-btn:hover, .rec-btn:hover { transform: translateY(-2px); }
.speak-btn:active, .rec-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(244,183,64,.6); }
.rec-btn { background: linear-gradient(135deg, var(--candy-pink), #ff7aa8); color: #fff; box-shadow: 0 4px 0 rgba(255,122,168,.6); }
.score { font-size: 22px; margin: 14px 0; color: var(--candy-green-d); font-weight: 800; }
.pc-feedback { margin: 18px 0; font-size: 17px; min-height: 26px; font-weight: 600; }
.pc-feedback.ok { color: var(--candy-green-d); }
.pc-feedback.bad { color: #ff6b8a; }
.pc-feedback:empty { display: none; }
.pc-actions { margin-top: 8px; }

/* 积分 badge */
.points-badge {
    margin-left: auto; background: #fff3d6; color: #b8860b;
    border: 2px solid #f0d28a; padding: 6px 16px; border-radius: 18px;
    font-size: 15px; font-weight: 800;
}
.pts-delta { font-weight: 800; font-size: 18px; }
.pts-delta.plus { color: var(--candy-green-d); }
.pts-delta.minus { color: #ff6b8a; }

/* ===== tabs / 表格 ===== */
.tabs { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.tab { padding: 9px 16px; border-radius: 16px; background: #f3f7ff; text-decoration: none; color: var(--ink); font-size: 14px; font-weight: 600; transition: .12s; border: 2px solid transparent; }
.tab:hover { border-color: var(--candy-blue); }
.tab.active { background: var(--candy-blue); color: #fff; }
.tbl { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
.card > .tbl, .tbl { display: block; overflow-x: auto; }
.tbl th, .tbl td { padding: 11px 12px; border-bottom: 2px solid #f0f3fa; text-align: left; }
.tbl th { background: #f6f9ff; color: var(--candy-blue-d); border-radius: 10px 10px 0 0; }
.tbl tbody tr:hover { background: #fbfdff; }
.tbl td.ok { color: var(--candy-green-d); font-weight: 700; }
.tbl td.bad { color: #ff6b8a; font-weight: 700; }
.tbl td.points { color: var(--candy-orange-d, #ff8a3d); font-weight: 700; }

/* ===== 统计卡片 ===== */
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat-grid.small { grid-template-columns: repeat(4, 1fr); }
.stat {
    background: linear-gradient(160deg, #ffffff, #f3fbff);
    border-radius: 18px; padding: 20px; text-align: center;
    border: 3px solid #eaf6ff; box-shadow: var(--shadow);
}
.stat .num { font-size: 30px; font-weight: 800; color: var(--candy-blue-d); }
.stat .lbl { font-size: 14px; color: var(--ink-soft); margin-top: 4px; }

.empty { text-align: center; color: #b0b0c8; padding: 24px; font-size: 16px; }
.hint { color: #9aa0bf; font-size: 14px; }

/* ===== 表单输入 ===== */
.inp {
    padding: 10px 14px; border-radius: 12px; border: 2px solid #dce4f5;
    font-size: 15px; background: #fff; color: var(--ink); min-width: 140px; box-sizing: border-box;
}
.inp:focus { outline: none; border-color: var(--candy-blue); box-shadow: 0 0 0 3px rgba(94,138,255,.18); }

/* 按钮变体 */
.btn.small { padding: 7px 14px; font-size: 13px; border-radius: 12px; }
.btn.danger { background: #fff0f3; color: #ff6b8a; border-color: #ffd0da; }
.btn.danger:hover { background: #ff6b8a; color: #fff; border-color: #ff6b8a; }

/* 弹窗 */
.modal { position: fixed; inset: 0; background: rgba(40,52,90,.45); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 16px; }
.modal.hidden { display: none; }
.modal-box { background: #fff; border-radius: 22px; padding: 28px; width: 100%; max-width: 460px; box-shadow: 0 18px 50px rgba(40,52,90,.28); }
.modal-box h3 { margin: 0 0 16px; color: var(--candy-blue-d); }
.modal-box label { display: block; font-size: 13px; color: var(--ink-soft); margin-bottom: 12px; font-weight: 600; }
.modal-box .inp { width: 100%; margin-top: 4px; }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 8px; }

/* 分页条 */
.pager { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.pager-info { color: var(--ink-soft); font-size: 14px; }
.pager-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.btn.disabled, .btn.disabled:hover { background: #f1f3fa; color: #c2c7da; border-color: #e6e9f2; cursor: default; pointer-events: none; }

/* ===== 错题本：卡片网格 + 筛选条 ===== */
.mistakes-card { border: 4px solid #ffe2f1; background: linear-gradient(160deg, #ffffff, #fef6ff); }
.filter-bar { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; margin: 14px 0 6px; }
.field-inline { display: flex; align-items: center; gap: 6px; font-weight: 700; color: var(--ink); }
.field-inline select {
    padding: 8px 12px; border-radius: 14px; border: 2px solid #e3e9f5;
    background: #fbfdff; font-size: 15px; color: var(--ink); cursor: pointer;
}
.field-inline select:focus { outline: none; border-color: var(--candy-blue); }
.mistake-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin: 18px 0; }
.mistake-card {
    background: linear-gradient(160deg, #ffffff, #f3fbff);
    border: 3px solid #e6f3ff; border-radius: 18px; padding: 16px;
    text-align: center; box-shadow: 0 6px 16px rgba(120,140,200,.12); transition: .15s;
}
.mistake-card:hover { transform: translateY(-4px); border-color: var(--candy-blue); }
.mc-word { font-size: 22px; font-weight: 800; color: var(--candy-blue-d); }
.mc-meaning { font-size: 15px; color: var(--ink); margin: 4px 0 8px; }
.mc-meta { font-size: 13px; color: var(--ink-soft); margin: 2px 0; }

/* ===== 登录页 ===== */
.login-card { max-width: 400px; margin: 8vh auto; border: 4px solid #ffe2f1; background: linear-gradient(160deg, #ffffff, #fef6ff); }
.login-card h2 { color: var(--candy-pink); text-align: center; }

/* ===== 响应式 ===== */
@media (max-width: 720px) {
    .mode-grid { grid-template-columns: 1fr; }
    .stat-grid, .stat-grid.small { grid-template-columns: repeat(2, 1fr); }
    .choices { grid-template-columns: 1fr; }
    .hero h1 { font-size: 26px; }
    header { padding: 0 14px; height: 56px; }
    header .brand { font-size: 16px; }
    header nav a { margin-left: 8px; font-size: 13px; padding: 4px 6px; }
    main { padding: 0 12px; }
}