/* ============================================================
 * 习思·单词速记 —— 应用内公共样式（配合 sj.css 使用，复用其变量）
 * 引入方式：<link rel="stylesheet" href="sj.css"> 之后引本文件
 * ============================================================ */

/* ---------- 应用内顶栏 ---------- */
.app-topbar {
    position: sticky; top: 0; z-index: 60;
    display: flex; align-items: center; gap: 18px;
    height: 58px; padding: 0 22px;
    background: rgba(255,255,255,.94); backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(34,35,46,.08);
}
.at-brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 16px; color: var(--primary-dark); flex: none; }
.at-brand img { width: 30px; height: 30px; border-radius: 8px; }
.at-links { display: flex; gap: 4px; flex: 1; overflow-x: auto; }
.at-links a {
    padding: 7px 14px; border-radius: 999px; font-size: 14px; color: var(--text-body);
    white-space: nowrap; transition: all .25s;
}
.at-links a:hover { background: var(--paper-deep); color: var(--primary-dark); }
.at-links a.active { background: var(--primary); color: #fff; }
.at-user { display: flex; align-items: center; gap: 10px; flex: none; }
.at-name { font-size: 14px; color: var(--text-body); font-weight: 600; }
.at-logout {
    border: 1px solid rgba(26,95,122,.35); color: var(--primary);
    background: none; border-radius: 999px; padding: 5px 14px;
    font-size: 13px; cursor: pointer; font-family: inherit; transition: all .25s;
}
.at-logout:hover { background: var(--primary); color: #fff; }

/* ---------- 卡片栅格 ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.app-card {
    background: var(--white); border-radius: var(--radius-lg);
    box-shadow: var(--shadow); padding: 24px 22px;
    transition: transform .3s, box-shadow .3s;
}
.app-card.hoverable:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.app-card h3 { font-size: 18px; color: var(--primary-dark); }
.app-card .card-sub { margin-top: 6px; font-size: 13.5px; color: var(--text-light); }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    border: none; border-radius: 999px; cursor: pointer; font-family: inherit;
    font-size: 15px; font-weight: 700; padding: 10px 22px;
    transition: transform .2s, box-shadow .2s, background .2s;
}
.btn:active { transform: scale(.96); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-light); }
.btn-ghost { background: var(--paper-deep); color: var(--primary-dark); }
.btn-ghost:hover { background: #dde8f2; }
.btn-lg { font-size: 17px; padding: 14px 34px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ---------- 表单控件 ---------- */
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-size: 14px; font-weight: 700; color: var(--ink); margin-bottom: 7px; }
.form-input, .form-select, .form-textarea {
    width: 100%; border: 1.5px solid rgba(26,95,122,.25); border-radius: 12px;
    padding: 11px 15px; font-size: 15px; font-family: inherit; color: var(--ink);
    background: #fff; transition: border-color .2s, box-shadow .2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,95,122,.12);
}
.form-textarea { min-height: 110px; resize: vertical; }
.form-tip { margin-top: 6px; font-size: 12.5px; color: var(--text-light); }

/* ---------- 表格 ---------- */
.app-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.app-table th, .app-table td { padding: 12px 16px; text-align: left; font-size: 14px; }
.app-table th { background: var(--paper-deep); color: var(--primary-dark); font-weight: 700; white-space: nowrap; }
.app-table tr + tr td { border-top: 1px solid rgba(34,35,46,.06); }
.app-table tbody tr:hover { background: var(--paper); }

/* ---------- 徽章 / 标签 ---------- */
.tag {
    display: inline-block; padding: 3px 12px; border-radius: 999px;
    font-size: 12px; font-weight: 700;
    background: var(--paper-deep); color: var(--primary-dark);
}
.tag-green { background: #e3f3e7; color: #2f7d43; }
.tag-orange { background: #fdeede; color: #b0600f; }
.tag-red { background: #fbe3e3; color: #b33737; }
.tag-violet { background: #ebe9f8; color: var(--violet); }

/* ---------- 进度条 ---------- */
.progress { height: 10px; border-radius: 999px; background: var(--paper-deep); overflow: hidden; }
.progress > i {
    display: block; height: 100%; border-radius: 999px;
    background: linear-gradient(90deg, var(--primary), #2d8fb0);
    transition: width .5s ease;
}
.progress.accent > i { background: linear-gradient(90deg, var(--accent), var(--accent-light)); }
.progress.green > i { background: linear-gradient(90deg, var(--c-learn), #8fd0a0); }

/* ---------- 页签 ---------- */
.tabs { display: flex; gap: 8px; border-bottom: 2px solid rgba(26,95,122,.12); margin-bottom: 22px; flex-wrap: wrap; }
.tabs .tab {
    padding: 10px 20px; font-size: 15px; font-weight: 700; color: var(--text-light);
    border: none; background: none; cursor: pointer; font-family: inherit;
    border-bottom: 3px solid transparent; margin-bottom: -2px; transition: all .25s;
}
.tabs .tab:hover { color: var(--primary-dark); }
.tabs .tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* ---------- 模态框 ---------- */
.modal-mask {
    position: fixed; inset: 0; z-index: 100;
    background: rgba(18,58,78,.45); backdrop-filter: blur(3px);
    display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal-card {
    background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-hover);
    padding: 30px 28px; max-width: 420px; width: 100%;
}
.modal-msg { font-size: 16px; color: var(--ink); line-height: 1.7; }
.modal-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 22px; }

/* ---------- Toast ---------- */
.toast-box {
    position: fixed; top: 74px; left: 50%; transform: translateX(-50%);
    z-index: 200; display: flex; flex-direction: column; gap: 10px; align-items: center;
    pointer-events: none;
}
.toast {
    padding: 11px 24px; border-radius: 999px; font-size: 14.5px; font-weight: 700;
    color: #fff; background: var(--ink); box-shadow: var(--shadow-hover);
    opacity: 0; transform: translateY(-12px); transition: all .3s;
}
.toast.show { opacity: 1; transform: none; }
.toast-success { background: var(--c-learn); }
.toast-error { background: #c0504d; }
.toast-info { background: var(--primary); }

/* ---------- 彩带画布 ---------- */
.confetti-canvas { position: fixed; inset: 0; z-index: 300; pointer-events: none; }

/* ---------- 学习卡片（翻面） ---------- */
.flashcard-wrap { perspective: 1200px; max-width: 520px; margin: 0 auto; }
.flashcard {
    position: relative; width: 100%; min-height: 320px;
    transform-style: preserve-3d; transition: transform .6s;
    cursor: pointer;
}
.flashcard.flipped { transform: rotateY(180deg); }
.flashcard .face {
    position: absolute; inset: 0; backface-visibility: hidden;
    background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-hover);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 34px 28px; text-align: center;
}
.flashcard .face.back { transform: rotateY(180deg); }
.flashcard .fc-word { font-size: 40px; font-weight: 800; color: var(--primary-dark); }
.flashcard .fc-phonetic { margin-top: 8px; font-size: 16px; color: var(--text-light); }
.flashcard .fc-trans { font-size: 22px; color: var(--ink); font-weight: 700; }
.flashcard .fc-example { margin-top: 14px; font-size: 14.5px; color: var(--text-body); }
.ex-speak {
    background: none; border: none; cursor: pointer; font-size: 16px;
    padding: 2px 6px; border-radius: 8px; vertical-align: middle;
}
.ex-speak:hover { background: var(--paper-deep); }
.flashcard .fc-hint { margin-top: 22px; font-size: 12.5px; color: var(--text-light); }

/* ---------- 评分四键 ---------- */
.grade-btns { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; max-width: 640px; margin: 26px auto 0; }
.grade-btn {
    border: none; border-radius: var(--radius); padding: 16px 8px;
    font-size: 16px; font-weight: 800; color: #fff; cursor: pointer;
    font-family: inherit; transition: transform .2s, box-shadow .2s;
    display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.grade-btn small { font-size: 12px; font-weight: 500; opacity: .85; }
.grade-btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.grade-btn:active { transform: scale(.96); }
.grade-1 { background: #d9534f; } /* 不认识 · 红 */
.grade-2 { background: var(--accent); } /* 有点难 · 橙 */
.grade-3 { background: var(--c-learn); } /* 认识 · 绿 */
.grade-4 { background: var(--c-teach); } /* 太简单 · 蓝 */

/* ---------- 管理后台布局 ---------- */
.admin-layout { display: flex; min-height: 100vh; }
.admin-side {
    flex: none; width: 220px; background: #123a4e; color: rgba(255,255,255,.85);
    padding: 24px 14px; display: flex; flex-direction: column; gap: 4px;
}
.admin-side .side-brand { font-size: 17px; font-weight: 800; color: #fff; padding: 6px 12px 18px; }
.admin-side a {
    padding: 11px 14px; border-radius: 10px; font-size: 14.5px;
    color: rgba(255,255,255,.78); transition: all .25s;
}
.admin-side a:hover { background: rgba(255,255,255,.1); color: #fff; }
.admin-side a.active { background: var(--primary); color: #fff; }
.admin-main { flex: 1; padding: 28px 30px; background: var(--paper); min-width: 0; }

/* ---------- 热力图 ---------- */
.heatmap { display: grid; grid-template-columns: repeat(auto-fill, 14px); gap: 4px; }
.heatmap .hm-cell { width: 14px; height: 14px; border-radius: 3px; background: var(--paper-deep); }
.heatmap .hm-1 { background: #bfe3cc; }
.heatmap .hm-2 { background: #7cc793; }
.heatmap .hm-3 { background: #45a866; }
.heatmap .hm-4 { background: #2b7a46; }

/* ---------- 排行榜 ---------- */
.rank-list { display: flex; flex-direction: column; gap: 10px; }
.rank-item {
    display: flex; align-items: center; gap: 14px;
    background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
    padding: 14px 18px;
}
.rank-no {
    flex: none; width: 34px; height: 34px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; color: #fff; background: var(--text-light); font-size: 15px;
}
.rank-item:nth-child(1) .rank-no { background: #e8a13f; }
.rank-item:nth-child(2) .rank-no { background: #9aa7b5; }
.rank-item:nth-child(3) .rank-no { background: #c08356; }
.rank-name { flex: 1; font-weight: 700; color: var(--ink); }
.rank-score { font-size: 18px; font-weight: 800; color: var(--accent); }

/* ---------- 首页「开始学习」三端入口横幅（index.html 用） ---------- */
.start-band {
    border-radius: var(--radius-lg); overflow: hidden;
    background: linear-gradient(150deg, #123a4e 0%, #1a5f7a 55%, #2d8fb0 100%);
    color: #fff; padding: 30px 30px 34px; margin-bottom: 30px;
    border: 1px solid rgba(255,255,255,.18);
    box-shadow: var(--shadow-hover);
}
.start-band .sb-title { font-size: 24px; font-weight: 800; }
.start-band .sb-sub { margin-top: 6px; font-size: 14px; color: rgba(255,255,255,.82); }
.start-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 22px; }
.start-btn {
    display: flex; align-items: center; gap: 14px;
    background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.24);
    border-radius: var(--radius); padding: 18px 20px; color: #fff;
    transition: transform .3s, box-shadow .3s, background .3s;
}
.start-btn:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); background: rgba(255,255,255,.16); }
.start-btn .sb-icon {
    flex: none; width: 50px; height: 50px; border-radius: 14px; font-size: 26px;
    display: flex; align-items: center; justify-content: center;
}
.sb-student .sb-icon { background: var(--c-learn); }
.sb-teacher .sb-icon { background: var(--c-teach); }
.sb-admin .sb-icon { background: var(--violet); }
.start-btn .sb-name { font-size: 18px; font-weight: 800; }
.start-btn .sb-desc { font-size: 12.5px; color: rgba(255,255,255,.78); margin-top: 2px; }

/* 导航「开始学习」高亮链接（accent 描边） */
.sj-links a.start-link {
    border: 1.5px solid var(--accent); color: var(--accent); font-weight: 700;
}
.sj-links a.start-link:hover { background: var(--accent); color: #fff; }

/* ---------- 登录页 ---------- */
.login-wrap {
    min-height: calc(100vh - 62px);
    display: flex; align-items: center; justify-content: center;
    padding: 46px 20px;
    background: linear-gradient(160deg, #eaf1f7 0%, #f6f8fb 60%, #fdeede 100%);
}
.login-card {
    width: 100%; max-width: 430px;
    background: #fff; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-hover); padding: 36px 32px 30px;
}
.login-card .lc-head { text-align: center; margin-bottom: 22px; }
.login-card .lc-head h1 { font-size: 23px; color: var(--primary-dark); }
.login-card .lc-head p { margin-top: 6px; font-size: 13.5px; color: var(--text-light); }
.login-tabs { display: flex; gap: 10px; margin-bottom: 24px; }
.login-tabs button {
    flex: 1; padding: 11px 0; border-radius: 999px; border: 1.5px solid rgba(26,95,122,.25);
    background: #fff; color: var(--text-body); font-size: 15px; font-weight: 700;
    cursor: pointer; font-family: inherit; transition: all .25s;
}
.login-tabs button.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.login-note {
    margin-top: 18px; padding: 12px 14px; border-radius: 12px;
    background: var(--paper-deep); font-size: 13px; color: var(--text-body); line-height: 1.7;
}
.login-foot { margin-top: 16px; text-align: center; font-size: 12.5px; color: var(--text-light); }
.login-foot a { color: var(--primary); }
.login-foot a:hover { text-decoration: underline; }
.login-foot .lf-sep { margin: 0 8px; color: rgba(34,35,46,.25); }
.demo-link {
    background: none; border: none; padding: 0; cursor: pointer;
    font-size: 12.5px; color: var(--accent); font-weight: 700; font-family: inherit;
}
.demo-link:hover { text-decoration: underline; }
.demo-link:disabled { opacity: .6; cursor: default; text-decoration: none; }
.admin-login .login-card { border-top: 6px solid #123a4e; }

/* ---------- 响应式四断点 ---------- */
@media (max-width: 1024px) {
    .card-grid, .card-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
    .admin-side { width: 180px; }
}
@media (max-width: 900px) {
    .start-grid { grid-template-columns: 1fr; }
    .app-topbar { flex-wrap: wrap; height: auto; padding: 10px 16px; gap: 8px; }
    .at-links { order: 3; width: 100%; flex: 1 1 100%; }
}
@media (max-width: 768px) {
    .grade-btns { grid-template-columns: repeat(2, 1fr); }
    .card-grid, .card-grid.cols-2, .card-grid.cols-4 { grid-template-columns: 1fr; }
    /* 管理端侧边栏 → 顶部单行横滚导航 */
    .admin-layout { flex-direction: column; }
    .admin-side {
        width: 100%; flex-direction: row; flex-wrap: nowrap; align-items: center;
        padding: 10px 12px; overflow-x: auto; -webkit-overflow-scrolling: touch; gap: 6px;
    }
    .admin-side .side-brand { width: auto; flex: none; padding: 4px 10px 4px 4px; font-size: 15px; }
    .admin-side a { flex: none; padding: 8px 12px; font-size: 13.5px; white-space: nowrap; }
    .admin-main { padding: 20px 16px; }
    /* 表格小屏横向滚动 */
    .app-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .app-table th, .app-table td { padding: 10px 12px; font-size: 13.5px; white-space: nowrap; }
    /* 顶栏链接横滚、缩小 */
    .at-links { padding-bottom: 2px; -webkit-overflow-scrolling: touch; }
    .at-links a { padding: 6px 12px; font-size: 13.5px; }
    .at-name { font-size: 13px; }
    .at-logout { padding: 5px 12px; font-size: 12.5px; }
    /* 弹窗小屏自适应并可滚动 */
    .modal-mask { padding: 14px; }
    .modal-card { max-height: 88vh; overflow: auto; -webkit-overflow-scrolling: touch; }
    .modal-actions { flex-wrap: wrap; }
    /* 大按钮触控高度 */
    .btn { min-height: 44px; }
    .grade-btn { min-height: 56px; }
}
@media (max-width: 480px) {
    .start-band { padding: 22px 18px 26px; }
    .start-band .sb-title { font-size: 19px; }
    .start-btn { padding: 14px 16px; }
    .start-btn .sb-icon { width: 42px; height: 42px; font-size: 22px; }
    .login-card { padding: 26px 20px 22px; }
    .login-wrap { padding: 26px 12px; }
    .login-tabs button { font-size: 14px; padding: 10px 0; }
    /* 顶栏进一步收紧 */
    .app-topbar { padding: 8px 12px; gap: 6px; }
    .at-brand { font-size: 14px; }
    .at-brand img { width: 26px; height: 26px; }
    .at-links a { padding: 6px 10px; font-size: 13px; }
    /* 学习卡片与评分键 */
    .flashcard { min-height: 260px; }
    .flashcard .face { padding: 24px 18px; }
    .flashcard .fc-word { font-size: 30px; }
    .flashcard .fc-example { font-size: 14px; }
    .grade-btns { gap: 10px; margin-top: 20px; }
    .grade-btn { font-size: 14px; padding: 13px 6px; }
    .btn-lg { font-size: 16px; padding: 13px 26px; }
    /* 页签 / 弹窗 / 管理端 */
    .tabs { gap: 4px; }
    .tabs .tab { padding: 9px 12px; font-size: 14px; }
    .modal-card { padding: 24px 20px; }
    .modal-actions .btn { flex: 1; }
    .admin-main { padding: 16px 12px; }
}

/* ---------- 打印样式（周报打印用） ---------- */
@media print {
    .app-topbar, .sj-nav, .sj-footer, .btn, .toast-box, .admin-side, .confetti-canvas { display: none !important; }
    body { background: #fff; }
    .app-card, .app-table { box-shadow: none; border: 1px solid #ddd; }
    .admin-main { padding: 0; }
}

/* ---------- 首页首屏「学生端 · 开始学习」单卡片（index.html 用，替代原三端 start-band） ---------- */
.start-card {
    max-width: 100%; margin: 0 auto 30px; text-align: center;
    border-radius: var(--radius-lg); overflow: hidden;
    background: linear-gradient(150deg, #123a4e 0%, #1a5f7a 55%, #2d8fb0 100%);
    color: #fff; padding: 34px 34px 36px;
    border: 1px solid rgba(255,255,255,.18);
    box-shadow: var(--shadow-hover);
}
.start-card .sc-title { font-size: 26px; font-weight: 800; }
.start-card .sc-sub { margin-top: 8px; font-size: 14.5px; color: rgba(255,255,255,.85); }
.sc-modes { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0 28px; text-align: left; }
.sc-mode {
    background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.24);
    border-radius: var(--radius); padding: 16px 18px;
}
.sc-mode .scm-name { font-size: 16.5px; font-weight: 800; }
.sc-mode .scm-name small { display: block; margin-top: 3px; font-size: 12.5px; font-weight: 600; color: rgba(255,255,255,.78); }
.sc-mode .scm-desc { margin-top: 8px; font-size: 13px; line-height: 1.75; color: rgba(255,255,255,.85); }
.start-card .sc-go { box-shadow: 0 8px 22px rgba(0,0,0,.25); }
.start-card .sc-actions { display: flex; gap: 14px; justify-content: center; align-items: stretch; flex-wrap: wrap; }
.start-card .sc-actions .btn { flex: 1 1 0; }
.start-card .sc-actions .btn-wide { flex: 1 1 100%; }
.start-card .sc-actions .btn small { display: block; margin-top: 3px; font-size: 12px; font-weight: 600; opacity: .72; }
@media (max-width: 600px) {
    .start-card .sc-actions { gap: 10px; }
    .start-card .sc-actions .btn { padding-left: 12px; padding-right: 12px; }
}

/* ---------- 全站统一两行页脚（f-entries 端入口 + f-beian 备案） ---------- */
.sj-footer .f-entries {
    display: flex; justify-content: center; align-items: center;
    gap: 14px; flex-wrap: wrap; margin-bottom: 18px;
}
.sj-footer .f-entries a {
    display: inline-flex; align-items: center; padding: 8px 20px;
    border-radius: 999px; font-size: 14px; font-weight: 700; color: #fff;
    background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.26);
    transition: all .25s;
}
.sj-footer .f-entries a:hover { background: rgba(255,255,255,.22); color: #fff; }
.sj-footer .f-beian {
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    font-size: 12.5px; color: rgba(255,255,255,.7);
}
.sj-footer .f-beian a { display: inline-flex; align-items: center; gap: 5px; color: rgba(255,255,255,.75); }
.sj-footer .f-beian a:hover { color: #ffd9ae; }
.sj-footer .f-beian img { width: 16px; height: 16px; display: block; }

@media (max-width: 768px) {
    .sc-modes { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .start-card { padding: 26px 20px 30px; }
    .start-card .sc-title { font-size: 21px; }
    .start-card .sc-sub { font-size: 13.5px; }
    .sj-footer .f-entries { gap: 10px; }
    .sj-footer .f-entries a { padding: 6px 14px; font-size: 13px; }
    .sj-footer .f-beian { font-size: 12px; }
}