/* =========================================================
   笋宝数独教师后台公共样式

   后续修改整个后台颜色时，优先修改 :root 中的变量。
   ========================================================= */

:root {
    --admin-background: #f4f5f7;
    --admin-card: #ffffff;

    --admin-text: #222222;
    --admin-text-secondary: #777777;
    --admin-text-light: #999999;

    --admin-border: #e2e4e8;
    --admin-border-light: #eeeeee;

    --admin-primary: #222222;
    --admin-primary-hover: #000000;

    --admin-success-background: #eaf7ef;
    --admin-success-text: #207842;

    --admin-info-background: #eaf2ff;
    --admin-info-text: #2e63b7;

    --admin-warning-background: #fff8e8;
    --admin-warning-text: #805a13;

    --admin-danger-background: #fff0ed;
    --admin-danger-text: #b5412f;

    --admin-shadow:
        0 8px 30px
        rgba(0, 0, 0, 0.05);

    --admin-shadow-hover:
        0 12px 34px
        rgba(0, 0, 0, 0.08);

    --admin-page-width: 1500px;
    --admin-page-narrow-width: 1180px;
}

/* =========================================================
   基础样式
   ========================================================= */

* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    min-height: 100%;
}

body {
    margin: 0;
    background: var(--admin-background);
    color: var(--admin-text);
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Microsoft YaHei",
        Arial,
        sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
textarea,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

.admin-page {
    width: min(
        var(--admin-page-width),
        calc(100% - 40px)
    );
    margin: 0 auto;
    padding: 30px 0 60px;
}

.admin-page.admin-page-narrow {
    width: min(
        var(--admin-page-narrow-width),
        calc(100% - 40px)
    );
}

.admin-main {
    width: 100%;
}

/* =========================================================
   顶部标题与导航
   ========================================================= */

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 28px 32px;
    border-radius: 20px;
    background: var(--admin-card);
    box-shadow: var(--admin-shadow);
}

.admin-header-main {
    min-width: 0;
}

.admin-title {
    margin: 0;
    color: var(--admin-text);
    font-size: 30px;
    font-weight: 700;
    line-height: 1.3;
}

.admin-subtitle {
    margin-top: 10px;
    color: var(--admin-text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.admin-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    flex-shrink: 0;
    gap: 12px;
}

.admin-nav-button {
    min-height: 42px;
    padding: 0 17px;
    border: 1px solid var(--admin-border);
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #ffffff;
    color: #555555;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    transition:
        border-color 0.2s ease,
        background 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.admin-nav-button:hover {
    border-color: var(--admin-primary);
    transform: translateY(-1px);
}

.admin-nav-button.active {
    border-color: var(--admin-primary);
    background: var(--admin-primary);
    color: #ffffff;
    box-shadow:
        0 6px 16px
        rgba(0, 0, 0, 0.12);
}

.admin-nav-button.active:hover {
    border-color: var(--admin-primary-hover);
    background: var(--admin-primary-hover);
    box-shadow:
        0 8px 20px
        rgba(0, 0, 0, 0.16);
}

.admin-nav-icon {
    width: 23px;
    height: 23px;
    border-radius: 7px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: #f1f2f4;
    color: #666666;
    font-size: 12px;
    font-weight: 700;
}

.admin-nav-button.active .admin-nav-icon {
    background:
        rgba(255, 255, 255, 0.18);
    color: #ffffff;
}

.admin-logout-form {
    display: flex;
    margin: 0;
    padding: 0;
}

.admin-logout-button:hover {
    border-color: #efb6b6;
    background: #fff5f5;
    color: #c84444;
}

.admin-logout-button:hover .admin-nav-icon {
    background: #ffe1e1;
    color: #c84444;
}

/* =========================================================
   Flask提示消息
   ========================================================= */

.admin-flash-list {
    margin-top: 20px;
}

.admin-flash-message {
    margin-bottom: 10px;
    padding: 14px 18px;
    border: 1px solid #e1e3e6;
    border-radius: 12px;
    background: #ffffff;
    color: #333333;
    box-shadow:
        0 4px 14px
        rgba(0, 0, 0, 0.04);
    font-size: 14px;
    line-height: 1.6;
}

.admin-flash-message.success {
    border-color: #b9dfc7;
    background: var(--admin-success-background);
    color: var(--admin-success-text);
}

.admin-flash-message.info {
    border-color: #c8d9f4;
    background: var(--admin-info-background);
    color: var(--admin-info-text);
}

.admin-flash-message.warning,
.admin-flash-message.default {
    border-color: #f0d7a6;
    background: var(--admin-warning-background);
    color: var(--admin-warning-text);
}

.admin-flash-message.error,
.admin-flash-message.danger {
    border-color: #efc1c1;
    background: #fff5f5;
    color: #b83c3c;
}

/* =========================================================
   通用卡片
   ========================================================= */

.admin-card {
    overflow: hidden;
    border-radius: 18px;
    background: var(--admin-card);
    box-shadow: var(--admin-shadow);
}

.admin-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 23px 25px;
    border-bottom: 1px solid var(--admin-border-light);
}

.admin-card-header.no-border {
    border-bottom: none;
}

.admin-card-title {
    margin: 0;
    color: var(--admin-text);
    font-size: 20px;
    font-weight: 700;
}

.admin-card-description {
    margin-top: 7px;
    color: #888888;
    font-size: 13px;
    line-height: 1.6;
}

.admin-card-body {
    padding: 25px;
}

/* =========================================================
   通用按钮
   ========================================================= */

.admin-button {
    min-height: 38px;
    padding: 0 15px;
    border: 1px solid var(--admin-border);
    border-radius: 9px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    background: #ffffff;
    color: #444444;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    transition:
        border-color 0.2s ease,
        background 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.admin-button:hover {
    border-color: var(--admin-primary);
    transform: translateY(-1px);
}

.admin-button.primary {
    border-color: var(--admin-primary);
    background: var(--admin-primary);
    color: #ffffff;
}

.admin-button.primary:hover {
    border-color: var(--admin-primary-hover);
    background: var(--admin-primary-hover);
    box-shadow:
        0 6px 16px
        rgba(0, 0, 0, 0.14);
}

.admin-button.edit {
    border-color: #cfd8e6;
    background: #f4f7fb;
    color: #245b9e;
}

.admin-button.edit:hover {
    border-color: #9db6d7;
    background: #eaf1fa;
    color: #174d8f;
}

.admin-button.success {
    border-color: #c9dfd2;
    background: #f1faf5;
    color: #247447;
}

.admin-button.success:hover {
    border-color: #91bea3;
    background: #e4f5eb;
    color: #185c36;
}

.admin-button.danger {
    border-color: #efc1c1;
    background: #fff7f7;
    color: #c64040;
}

.admin-button.danger:hover {
    border-color: #d98585;
    background: #ffecec;
    color: #aa2929;
}

/* =========================================================
   首页统计卡片
   ========================================================= */

.dashboard-summary-grid {
    display: grid;
    grid-template-columns:
        repeat(4, minmax(0, 1fr));
    gap: 18px;
    margin-top: 22px;
}

.dashboard-summary-link {
    display: block;
}

.dashboard-summary-card {
    min-height: 135px;
    padding: 23px;
    border: 1px solid transparent;
    border-radius: 18px;
    background: var(--admin-card);
    box-shadow:
        0 8px 25px
        rgba(0, 0, 0, 0.04);
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        border-color 0.2s ease;
}

.dashboard-summary-link:hover
.dashboard-summary-card,
.dashboard-summary-card.static:hover {
    border-color: #dddddd;
    transform: translateY(-2px);
    box-shadow: var(--admin-shadow-hover);
}

.dashboard-summary-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.dashboard-summary-label {
    color: var(--admin-text-secondary);
    font-size: 14px;
}

.dashboard-summary-icon {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #f1f2f4;
    color: #444444;
    font-size: 14px;
    font-weight: 700;
}

.dashboard-summary-number {
    margin-top: 13px;
    color: var(--admin-text);
    font-size: 32px;
    font-weight: 700;
}

.dashboard-summary-unit {
    margin-left: 5px;
    color: var(--admin-text-light);
    font-size: 13px;
    font-weight: normal;
}

.dashboard-summary-tip {
    margin-top: 8px;
    color: var(--admin-text-light);
    font-size: 12px;
    line-height: 1.5;
}

/* =========================================================
   首页内容区
   ========================================================= */

.dashboard-content-grid {
    display: grid;
    grid-template-columns:
        minmax(0, 1.45fr)
        minmax(360px, 0.75fr);
    gap: 22px;
    margin-top: 22px;
}

/* =========================================================
   通用表格
   ========================================================= */

.admin-table-wrapper {
    width: 100%;
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table.wide {
    min-width: 820px;
}

.admin-table th,
.admin-table td {
    padding: 15px 13px;
    border-bottom: 1px solid var(--admin-border-light);
    text-align: left;
    vertical-align: middle;
}

.admin-table th {
    background: #fafafa;
    color: #666666;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
}

.admin-table td {
    color: #333333;
    font-size: 13px;
}

.admin-table tbody tr:hover {
    background: #fcfcfc;
}

.admin-table tbody tr:last-child td {
    border-bottom: none;
}

.admin-primary-text {
    color: var(--admin-text);
    font-size: 14px;
    font-weight: 700;
}

.admin-secondary-text {
    margin-top: 4px;
    color: #888888;
    font-size: 12px;
    line-height: 1.5;
}

.admin-score {
    color: var(--admin-text);
    font-size: 19px;
    font-weight: 700;
}

.admin-score-unit {
    margin-left: 2px;
    color: #888888;
    font-size: 11px;
}

/* =========================================================
   状态标签
   ========================================================= */

.admin-badge {
    min-height: 25px;
    padding: 3px 9px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
}

.admin-badge.finished,
.admin-badge.ongoing,
.admin-badge.success {
    background: var(--admin-success-background);
    color: var(--admin-success-text);
}

.admin-badge.running,
.admin-badge.upcoming,
.admin-badge.info {
    background: var(--admin-info-background);
    color: var(--admin-info-text);
}

.admin-badge.expired,
.admin-badge.timeout,
.admin-badge.danger {
    background: var(--admin-danger-background);
    color: var(--admin-danger-text);
}

.admin-badge.ended,
.admin-badge.draft,
.admin-badge.default {
    background: #f1f1f1;
    color: #777777;
}

.admin-badge.unscheduled,
.admin-badge.warning {
    background: #fff7dc;
    color: #8a6500;
}

.admin-badge.published {
    background: var(--admin-primary);
    color: #ffffff;
}

/* =========================================================
   首页最近练习
   ========================================================= */

.dashboard-practice-list {
    padding: 4px 24px;
}

.dashboard-practice-item {
    padding: 19px 0;
    border-bottom: 1px solid var(--admin-border-light);
}

.dashboard-practice-item:last-child {
    border-bottom: none;
}

.dashboard-practice-title-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.dashboard-practice-title {
    min-width: 0;
    color: var(--admin-text);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.5;
}

.dashboard-practice-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 7px 15px;
    margin-top: 10px;
    color: #888888;
    font-size: 12px;
    line-height: 1.6;
}

.admin-published-text {
    color: #20814a;
}

.admin-draft-text {
    color: #999999;
}

/* =========================================================
   空状态
   ========================================================= */

.admin-empty-state {
    padding: 55px 20px;
    text-align: center;
    color: #888888;
    font-size: 14px;
    line-height: 1.7;
}

/* =========================================================
   后续列表页面可直接使用的表单样式
   ========================================================= */

.admin-form-grid {
    display: grid;
    grid-template-columns:
        repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.admin-form-item.full {
    grid-column: 1 / -1;
}

.admin-form-label {
    display: block;
    margin-bottom: 8px;
    color: #555555;
    font-size: 14px;
    font-weight: 600;
}

.admin-required {
    color: #c64040;
}

.admin-form-control {
    width: 100%;
    min-height: 46px;
    padding: 11px 14px;
    border: 1px solid #dddddd;
    border-radius: 10px;
    background: #ffffff;
    color: var(--admin-text);
    outline: none;
    font-size: 15px;
    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

textarea.admin-form-control {
    min-height: 100px;
    resize: vertical;
}

.admin-form-control:focus {
    border-color: var(--admin-primary);
    box-shadow:
        0 0 0 3px
        rgba(0, 0, 0, 0.05);
}

.admin-field-tip {
    margin-top: 7px;
    color: var(--admin-text-light);
    font-size: 13px;
    line-height: 1.6;
}

.admin-form-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

/* =========================================================
   登录页
   ========================================================= */

.admin-login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 18px;
    background: var(--admin-background);
}

.admin-login-card {
    width: 100%;
    max-width: 430px;
    padding: 38px 36px;
    border-radius: 24px;
    background: #ffffff;
    box-shadow:
        0 18px 60px
        rgba(0, 0, 0, 0.08);
}

.admin-login-logo {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    border-radius: 22px;
    background: var(--admin-primary);
    color: #ffffff;
    font-size: 27px;
    font-weight: 700;
}

.admin-login-title {
    margin: 24px 0 0;
    text-align: center;
    font-size: 28px;
    font-weight: 700;
}

.admin-login-description {
    margin-top: 10px;
    color: #888888;
    text-align: center;
    font-size: 14px;
    line-height: 1.7;
}

.admin-login-card .admin-flash-list {
    margin-top: 22px;
}

.admin-login-form {
    margin-top: 28px;
}

.admin-login-form-item {
    margin-bottom: 20px;
}

.admin-login-label {
    display: block;
    margin-bottom: 9px;
    color: #444444;
    font-size: 14px;
    font-weight: 600;
}

.admin-login-control {
    width: 100%;
    height: 48px;
    padding: 0 15px;
    border: 1px solid #dddddd;
    border-radius: 12px;
    outline: none;
    background: #ffffff;
    color: var(--admin-text);
}

.admin-login-control:focus {
    border-color: var(--admin-primary);
    box-shadow:
        0 0 0 3px
        rgba(0, 0, 0, 0.06);
}

.admin-login-submit {
    width: 100%;
    height: 50px;
    margin-top: 4px;
    border: none;
    border-radius: 12px;
    background: var(--admin-primary);
    color: #ffffff;
    cursor: pointer;
    font-size: 15px;
    font-weight: 700;
}

.admin-login-submit:hover {
    background: var(--admin-primary-hover);
}

.admin-login-security {
    margin-top: 22px;
    padding-top: 20px;
    border-top: 1px solid var(--admin-border-light);
    color: var(--admin-text-light);
    text-align: center;
    font-size: 12px;
    line-height: 1.7;
}

/* =========================================================
   响应式
   ========================================================= */

@media (max-width: 1300px) {
    .admin-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .admin-header-main {
        width: 100%;
    }

    .admin-nav {
        width: 100%;
        justify-content: flex-start;
    }
}

@media (max-width: 1100px) {
    .dashboard-summary-grid {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

    .dashboard-content-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 800px) {
    .admin-page,
    .admin-page.admin-page-narrow {
        width: calc(100% - 28px);
        padding-top: 18px;
    }

    .admin-header {
        padding: 24px;
    }

    .admin-nav {
        display: grid;
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .admin-nav > a {
        width: 100%;
    }

    .admin-logout-form {
        width: 100%;
        grid-column: 1 / -1;
    }

    .admin-nav-button {
        width: 100%;
        padding: 0 11px;
    }

    .admin-card-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .admin-form-grid {
        grid-template-columns: 1fr;
    }

    .admin-form-item.full {
        grid-column: auto;
    }
}

@media (max-width: 560px) {
    .admin-page,
    .admin-page.admin-page-narrow {
        width: calc(100% - 20px);
        padding-top: 10px;
    }

    .admin-header {
        padding: 20px;
        border-radius: 16px;
    }

    .admin-title {
        font-size: 25px;
    }

    .admin-subtitle {
        font-size: 13px;
    }

    .admin-nav {
        grid-template-columns: 1fr;
    }

    .admin-logout-form {
        grid-column: auto;
    }

    .dashboard-summary-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .dashboard-summary-card {
        min-height: 120px;
        padding: 18px;
    }

    .dashboard-summary-number {
        font-size: 27px;
    }

    .admin-form-actions {
        display: grid;
        grid-template-columns: 1fr;
    }

    .admin-form-actions .admin-button {
        width: 100%;
    }
}

@media (max-width: 430px) {
    .dashboard-summary-grid {
        grid-template-columns: 1fr;
    }

    .admin-login-card {
        padding: 30px 22px;
        border-radius: 20px;
    }
}