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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --danger: #ef4444;
    --success: #10b981;
    --radius: 10px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-tap-highlight-color: transparent;
}

/* ====== 页面容器 ====== */
.page { display: none; }
.page.active { display: block; }

/* ====== 登录页 ====== */
.login-container {
    max-width: 400px;
    margin: 0 auto;
    padding: 60px 24px 40px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.login-header {
    text-align: center;
    margin-bottom: 36px;
}

.logo-icon {
    width: 64px; height: 64px;
    background: var(--primary);
    color: white;
    font-size: 28px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    border-radius: 16px;
    margin: 0 auto 16px;
}

.login-header h1 { font-size: 22px; margin-bottom: 6px; }
.login-header p { color: var(--text-secondary); font-size: 14px; }

.login-form { display: flex; flex-direction: column; gap: 16px; }

/* ====== 输入组 ====== */
.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label { font-size: 13px; font-weight: 600; color: var(--text-secondary); }
.input-group input,
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    background: var(--card);
    outline: none;
    transition: border-color .2s;
    appearance: none;
    -webkit-appearance: none;
}
.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    border-color: var(--primary);
}
.input-group textarea { resize: vertical; min-height: 100px; }

.code-row { display: flex; gap: 10px; }
.code-row input { flex: 1; }

.char-count { font-size: 12px; color: var(--text-secondary); text-align: right; }

/* ====== 按钮 ====== */
.btn-primary {
    width: 100%;
    padding: 13px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s;
}
.btn-primary:active { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-code {
    padding: 12px 16px;
    background: white;
    color: var(--primary);
    border: 1.5px solid var(--primary);
    border-radius: var(--radius);
    font-size: 14px;
    white-space: nowrap;
    cursor: pointer;
    min-width: 110px;
    text-align: center;
}
.btn-code:disabled { opacity: 0.5; cursor: not-allowed; color: var(--text-secondary); border-color: var(--border); }

.btn-sm { padding: 10px 16px; font-size: 14px; width: auto; border-radius: 8px; }

.btn-icon {
    background: none; border: none;
    font-size: 20px; cursor: pointer;
    color: var(--text-secondary);
    padding: 4px 8px;
}

/* ====== 顶栏 ====== */
.topbar {
    background: var(--card);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 10;
}
.topbar-title { font-size: 17px; font-weight: 700; }

/* ====== 标签导航 ====== */
.tabs {
    display: flex;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 53px; z-index: 9;
}
.tab {
    flex: 1;
    padding: 13px 0;
    text-align: center;
    font-size: 15px;
    font-weight: 500;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all .2s;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

/* ====== 面板 ====== */
.panel { display: none; }
.panel.active { display: block; }
.panel-body { padding: 16px; }

/* ====== 搜索栏 ====== */
.search-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}
.search-bar input,
.search-bar select {
    flex: 1 1 auto;
    min-width: 100px;
    padding: 10px 12px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--card);
    outline: none;
}
.search-bar input:focus,
.search-bar select:focus { border-color: var(--primary); }
.search-bar .btn-sm { flex: 0 0 auto; }

/* ====== 问题列表 ====== */
.qlist { display: flex; flex-direction: column; gap: 12px; }

.qcard {
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border);
}

.qcard .q-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.qcard .q-company {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    margin-right: 6px;
}

.qcard .q-question {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.5;
    word-break: break-word;
}

.qcard .q-answer {
    background: #f9fafb;
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text);
    word-break: break-word;
    border-left: 3px solid var(--success);
}

.qcard .q-actions {
    display: flex;
    gap: 10px;
    padding-top: 12px;
    border-top: 1px solid #f0f0f5;
    margin-top: 12px;
}

.btn-action {
    padding: 6px 14px;
    border-radius: 16px;
    border: 1px solid #ddd;
    background: #fff;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    color: #555;
}

.btn-action:hover { background: #f5f5fa; }
.btn-action:disabled { opacity: 0.5; cursor: default; }

.btn-privacy-public {
    color: #e67e22;
    border-color: #f0c78e;
}
.btn-privacy-public:hover { background: #fef5e7; }

.btn-privacy-private {
    color: #27ae60;
    border-color: #a3d9b1;
}
.btn-privacy-private:hover { background: #e8f8ef; }

.btn-share {
    color: #4f6ef7;
    border-color: #b3bffa;
}
.btn-share:hover { background: #edf0fe; }

.share-toast {
    position: fixed;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: #fff;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 9999;
    animation: toastIn 0.3s ease;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.qcard .q-status {
    font-size: 12px;
    padding: 3px 8px;
    border-radius: 4px;
    display: inline-block;
}
.q-status.answered { background: #ecfdf5; color: var(--success); }
.q-status.waiting { background: #fffbeb; color: #d97706; }

.empty-tip {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 0;
    font-size: 14px;
}

.loadmore {
    text-align: center;
    padding: 16px;
    color: var(--primary);
    font-size: 14px;
    cursor: pointer;
}

.msg {
    margin-top: 10px;
    font-size: 14px;
    text-align: center;
    padding: 8px;
    border-radius: 6px;
}
.msg.success { background: #ecfdf5; color: var(--success); }
.msg.error { background: #fef2f2; color: var(--danger); }

/* ====== 后台样式 ====== */
.admin-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.admin-header h1 { font-size: 20px; }

.stats-row {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.stat-card {
    flex: 1; min-width: 100px;
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    border: 1px solid var(--border);
}
.stat-card .stat-num { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

.admin-filter {
    display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap;
}
.admin-filter input,
.admin-filter select {
    padding: 10px 12px; border: 1.5px solid var(--border);
    border-radius: 8px; font-size: 14px; outline: none;
    background: var(--card);
}
.admin-filter input:focus,
.admin-filter select:focus { border-color: var(--primary); }
.admin-filter input { flex: 1; min-width: 150px; }

.answer-area {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.answer-area textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    resize: vertical;
    min-height: 80px;
}
.answer-area textarea:focus { border-color: var(--primary); }

.answer-preview {
    background: #f9fafb;
    border-radius: 8px;
    padding: 12px;
    font-size: 14px;
    line-height: 1.7;
    border-left: 3px solid var(--success);
    word-break: break-word;
}

@media (max-width: 600px) {
    .login-container { padding: 40px 20px; }
    .panel-body { padding: 12px; }
    .search-bar { flex-direction: column; }
    .search-bar input,
    .search-bar select { width: 100%; }
    .admin-container { padding: 12px; }
}