/* 九章数学 AI 助手 - 样式表 */

/* ============ 全局样式 ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1E40AF;
    --primary-dark: #1E3A8A;
    --success-color: #059669;
    --warning-color: #D97706;
    --danger-color: #DC2626;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-900: #111827;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

html, body {
    width: 100%;
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #F0F9FF 0%, #FFFFFF 100%);
    color: var(--gray-900);
    font-size: 16px;
    line-height: 1.5;
}

/* ============ 顶部导航栏 ============ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: white;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #1E40AF, #1E3A8A);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo-text {
    color: white;
    font-weight: bold;
    font-size: 20px;
    font-family: 'Poppins', sans-serif;
}

.header-title h1 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    font-family: 'Poppins', sans-serif;
}

.header-title p {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 2px;
}

.menu-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--gray-500);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: var(--transition);
}

.menu-btn:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

/* ============ 主内容区域 ============ */
.main-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 16px;
    padding-bottom: 80px;
}

/* ============ 标签页导航 ============ */
.tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 24px;
    background: var(--gray-100);
    padding: 4px;
    border-radius: var(--border-radius);
}

.tab-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    border: none;
    background: transparent;
    color: var(--gray-600);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
}

.tab-btn.active {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.tab-label {
    display: none;
}

@media (min-width: 480px) {
    .tab-label {
        display: inline;
    }
}

/* ============ 标签页内容 ============ */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============ 卡片样式 ============ */
.card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 16px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ============ 上传卡片 ============ */
.upload-card {
    background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 100%);
    border: 2px dashed #93C5FD;
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    transition: var(--transition);
}

.upload-card:hover {
    border-color: #60A5FA;
    background: linear-gradient(135deg, #E0EFFF 0%, #E8F8FF 100%);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    color: var(--primary-color);
    opacity: 0.6;
}

.upload-card h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    font-family: 'Poppins', sans-serif;
}

.upload-card p {
    color: var(--gray-600);
    margin-bottom: 20px;
    font-size: 14px;
}

/* ============ 预览卡片 ============ */
.preview-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 16px;
}

.preview-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.preview-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--gray-200);
    margin-bottom: 12px;
    display: block;
}

/* ============ 搜题卡片 ============ */
.search-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
}

.search-card svg {
    margin-bottom: 16px;
}

.search-card h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    font-family: 'Poppins', sans-serif;
}

.search-card p {
    color: var(--gray-600);
    margin-bottom: 20px;
    font-size: 14px;
}

.search-box {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.search-box input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

/* ============ 结果卡片 ============ */
.success-card {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    border: 1px solid #86EFAC;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.success-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: #166534;
    font-family: 'Poppins', sans-serif;
}

.success-content p {
    font-size: 14px;
    color: #15803D;
    margin-top: 4px;
}

.result-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 12px;
}

.result-card h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Poppins', sans-serif;
}

.result-card h4 svg {
    width: 18px;
    height: 18px;
    color: var(--primary-color);
}

.result-content {
    background: var(--gray-50);
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-700);
    white-space: pre-wrap;
    word-break: break-word;
}

.result-content.answer {
    background: #F0FDF4;
    color: #166534;
    font-weight: 600;
    font-size: 16px;
}

.result-content.solution {
    background: #EFF6FF;
    color: #1E40AF;
}

.result-card.feedback {
    background: #FFFBEB;
    border-color: #FCD34D;
}

.result-card.feedback h4 {
    color: #92400E;
}

.result-card.feedback h4 svg {
    color: #D97706;
}

.result-card.feedback p {
    color: #78350F;
    font-size: 14px;
}

.no-result-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 60px 20px;
    text-align: center;
    color: var(--gray-500);
}

/* ============ 错误卡片 ============ */
.error-card {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--border-radius);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.error-card svg {
    color: var(--danger-color);
    flex-shrink: 0;
}

.error-card p {
    color: #991B1B;
    font-size: 14px;
}

/* ============ 按钮样式 ============ */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: 'Inter', sans-serif;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.2);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
    transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-success {
    background: var(--success-color);
    color: white;
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.2);
}

.btn-success:hover:not(:disabled) {
    background: #047857;
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
    transform: translateY(-2px);
}

.btn-outline {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-outline:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-icon {
    font-size: 16px;
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.button-group .btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.upload-card .button-group {
    margin-top: 20px;
}

.upload-card .button-group .btn {
    padding: 12px 16px;
}

/* ============ 加载指示 ============ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

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

.loading-overlay p {
    color: white;
    font-size: 14px;
}

/* ============ 响应式设计 ============ */
@media (max-width: 480px) {
    .header-content {
        padding: 10px 12px;
    }

    .header-title h1 {
        font-size: 14px;
    }

    .main-content {
        padding: 12px;
        padding-bottom: 60px;
    }

    .upload-card {
        padding: 30px 16px;
    }

    .upload-icon {
        width: 64px;
        height: 64px;
    }

    .upload-card h2 {
        font-size: 18px;
    }

    .btn {
        padding: 10px 16px;
        font-size: 13px;
    }
}

@media (min-width: 768px) {
    .main-content {
        padding: 24px;
    }

    .tabs {
        margin-bottom: 32px;
    }

    .upload-card {
        padding: 60px 40px;
    }

    .upload-icon {
        width: 96px;
        height: 96px;
    }

    .upload-card h2 {
        font-size: 24px;
    }
}