/* ============================================================
   教师端（jiaoshiduan）全局样式
   设计定位：温暖而专业的心理教育风格，与管理员端的科幻风格形成区分
   采用 CSS 变量体系，便于统一调整主题色
   ============================================================ */

/* ---------- CSS 变量体系 ---------- */
:root {
    --primary: #4a7cf7;
    --primary-light: #7ba3ff;
    --primary-dark: #3451b2;
    --primary-bg: rgba(74, 124, 247, 0.08);
    --primary-border: rgba(74, 124, 247, 0.25);

    --success: #52c41a;
    --success-bg: rgba(82, 196, 26, 0.08);
    --warning: #faad14;
    --warning-bg: rgba(250, 173, 20, 0.08);
    --danger: #ff4d4f;
    --danger-bg: rgba(255, 77, 79, 0.08);
    --danger-border: rgba(255, 77, 79, 0.35);

    --text-primary: #1a1a2e;
    --text-secondary: #5a5a7a;
    --text-muted: #9a9ab8;
    --text-white: #ffffff;

    --bg-body: #f0f4ff;
    --bg-card: #ffffff;
    --bg-sidebar: #1a1a2e;
    --bg-header: #ffffff;

    --border-color: #e8ecf4;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

/* ---------- 全局重置 ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
}

/* ---------- 通用按钮样式 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: var(--text-white);
    border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-success {
    background: var(--success);
    color: var(--text-white);
    border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
    background: #45a817;
}

.btn-danger {
    background: var(--danger);
    color: var(--text-white);
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background: #e04040;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary-bg);
}

.btn-sm {
    padding: 4px 12px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 28px;
    font-size: 16px;
}

/* ---------- 通用卡片样式 ---------- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 20px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title .icon {
    font-size: 18px;
}

/* ---------- 通用 Badge 标签 ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 100px;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

.badge-warning {
    background: var(--warning-bg);
    color: var(--warning);
}

.badge-danger {
    background: var(--danger-bg);
    color: var(--danger);
}

.badge-primary {
    background: var(--primary-bg);
    color: var(--primary);
}

/* ---------- 通用空状态 ---------- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-muted);
    text-align: center;
}

.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.5;
}

.empty-state .empty-text {
    font-size: 14px;
}

/* ---------- 通用加载动画 ---------- */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- 通用 Toast 提示 ---------- */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    color: var(--text-white);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.35s ease;
    max-width: 380px;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-warning { background: var(--warning); color: var(--text-primary); }
.toast-info { background: var(--primary); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ---------- 通用模态框 ---------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.modal-overlay.show {
    display: flex;
}

.modal-dialog {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 480px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(-20px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-muted);
    padding: 4px;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #d0d5e0;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #b0b5c0;
}