/* ── hefei-k12-edu-agent 前端样式 ── */

:root {
    --primary: #4A90D9;
    --primary-dark: #357ABD;
    --success: #52C41A;
    --warning: #FAAD14;
    --danger: #FF4D4F;
    --bg: #F5F7FA;
    --card-bg: #FFFFFF;
    --text: #2C3E50;
    --text-secondary: #7F8C8D;
    --border: #E8ECF1;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px;
}

/* ── Header ── */
.app-header {
    background: linear-gradient(135deg, #4A90D9, #5B8FF9);
    color: #fff;
    padding: 20px 24px;
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    box-shadow: var(--shadow);
}

.app-header h1 { font-size: 20px; font-weight: 700; }

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.stage-tabs {
    display: flex;
    background: rgba(255,255,255,0.2);
    border-radius: 8px;
    padding: 3px;
}

.stage-tab {
    padding: 6px 14px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: #fff;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all .2s;
}

.stage-tab.active { background: #fff; color: var(--primary); }

.stage-tab:hover { background: rgba(255,255,255,0.3); }

.grade-select, .subject-select {
    padding: 7px 12px;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    background: #fff;
    cursor: pointer;
    outline: none;
    min-width: 90px;
}

.subtitle { font-size: 13px; opacity: .95; font-weight: 600; }

/* ── Tabs ── */
.tab-nav {
    display: flex;
    gap: 6px;
    margin: 16px 0;
    background: #fff;
    padding: 8px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.tab-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all .2s;
}

.tab-btn.active {
    background: var(--primary);
    color: #fff;
}

.tab-btn:hover:not(.active) { background: #EEF3FA; color: var(--primary); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── 聊天布局 ── */
.chat-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 16px;
    min-height: 600px;
}

.chat-sidebar {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    max-height: 600px;
    overflow-y: auto;
}

.chat-sidebar h3 { font-size: 15px; margin-bottom: 12px; color: var(--primary-dark); }

.concept-list { list-style: none; }

.semester-group { margin-bottom: 12px; }

.semester-header {
    cursor: pointer;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-secondary);
    padding: 8px 10px;
    background: #F5F7FA;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
    user-select: none;
}

.semester-group.collapsed .semester-items { display: none; }

.semester-arrow { font-size: 10px; transition: transform .2s; }
.semester-group.collapsed .semester-arrow { transform: rotate(-90deg); }

.semester-count { margin-left: auto; font-size: 11px; }

.concept-item {
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 4px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background .15s;
}

.concept-item:hover { background: #F0F5FF; }

.concept-item.active { background: #E6F0FF; color: var(--primary-dark); font-weight: 600; }

.mastery-bar {
    flex: 1;
    height: 6px;
    background: #EDF0F3;
    border-radius: 3px;
    overflow: hidden;
    max-width: 60px;
    margin-left: auto;
}

.mastery-bar-fill { height: 100%; border-radius: 3px; transition: width .3s; }
.mastery-low { background: var(--danger); }
.mastery-mid { background: var(--warning); }
.mastery-high { background: var(--success); }

.chat-main {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    min-height: 600px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    max-height: 500px;
}

.chat-message { display: flex; margin-bottom: 16px; gap: 10px; }

.chat-message.user { flex-direction: row-reverse; }

.chat-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: #EDF3FA;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.chat-message.user .chat-avatar { background: #FFF7E6; }

.chat-bubble {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 12px;
    background: #F5F7FA;
    line-height: 1.7;
    word-break: break-word;
}

.chat-message.user .chat-bubble { background: #E6F0FF; }

.chat-bubble img { max-width: 100%; border-radius: 8px; margin-top: 8px; }

.chat-input-area {
    display: flex;
    gap: 10px;
    padding: 14px;
    border-top: 1px solid var(--border);
}

.chat-input-area textarea {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    resize: none;
    outline: none;
    font-family: inherit;
    line-height: 1.5;
}

.chat-input-area textarea:focus { border-color: var(--primary); }

/* ── 按钮 ── */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all .2s;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { background: #A8C6E8; cursor: not-allowed; }

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #3E9C14; }

/* ── 测评 ── */
.quiz-layout, .report-layout, .graph-layout {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.quiz-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.quiz-controls select, .quiz-controls input {
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 13px;
    outline: none;
}

.question-card {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 14px;
    background: #fff;
}

.q-header { font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; }
.q-content { font-size: 15px; line-height: 1.7; margin-bottom: 12px; }

.options-list { display: flex; flex-direction: column; gap: 8px; }

.option-item {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all .15s;
    font-size: 14px;
}

.option-item:hover { border-color: var(--primary); }

.option-item.selected {
    background: #E6F0FF;
    border-color: var(--primary);
    color: var(--primary-dark);
    font-weight: 600;
}

.quiz-result { text-align: center; padding: 20px 0; }

.quiz-score { font-size: 48px; font-weight: 800; }

/* ── 报告 ── */
.report-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 14px;
    margin-bottom: 20px;
}

.stat-card {
    background: #F8FAFC;
    border-radius: 10px;
    padding: 16px;
    text-align: center;
}

.stat-value { font-size: 26px; font-weight: 800; }
.stat-label { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

.concept-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.concept-table th, .concept-table td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.concept-table th { background: #F8FAFC; color: var(--text-secondary); font-weight: 600; }

.status-badge {
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.status-mastered { background: #F6FFED; color: var(--success); }
.status-learning { background: #FFF7E6; color: var(--warning); }
.status-weak { background: #FFF1F0; color: var(--danger); }

/* ── 响应式 ── */
@media (max-width: 860px) {
    .chat-layout { grid-template-columns: 1fr; }
    .chat-sidebar { max-height: 260px; }
    .header-right { width: 100%; }
    .app-header { flex-direction: column; align-items: flex-start; }
}