/* ===== 基础重置与变量 ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --max-width: 960px;
}

* {
    box-sizing: border-box;
}

body {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
}

/* ===== 标题 ===== */
h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 8px;
}

h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0 0 12px 0;
}

h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-700);
    margin: 0 0 10px 0;
}

/* ===== 卡片容器 ===== */
.card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--gray-200);
}

.card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

/* ===== 设置区域 ===== */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.settings-grid > div {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-600);
}

input[type="text"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    color: var(--gray-800);
    background: #fff;
    transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="text"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.7;
}

/* ===== 标签页 ===== */
.tab-container {
    position: relative;
}

.tab-buttons {
    display: flex;
    gap: 4px;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 0;
}

.tab-button {
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    margin: 0;
    border-radius: 0;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    position: relative;
    top: 2px;
    transition: color 0.15s, border-color 0.15s;
}

.tab-button:hover {
    color: var(--primary);
    background: transparent;
}

.tab-button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: transparent;
}

.tab-button.active:hover {
    background: transparent;
}

.tab-content {
    display: none;
    padding: 20px 0 0 0;
}

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

/* ===== 按钮 ===== */
.button-group {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}

button {
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.15s, transform 0.1s;
}

button:hover {
    background: var(--primary-dark);
}

button:active {
    transform: translateY(1px);
}

button.upload {
    background: var(--gray-200);
    color: var(--gray-600);
    padding: 6px 14px;
    font-size: 13px;
}

button.upload:hover {
    background: var(--gray-300);
    color: var(--gray-700);
}

.download-btn {
    background: var(--success);
    display: block;
    margin: 16px auto 0;
}

.download-btn:hover {
    background: #059669;
}

/* ===== 上传控件 ===== */
.upload-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 8px;
}

.textarea-wrapper {
    width: 100%;
}

/* ===== Task 选择器 ===== */
.task-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.task-selector-wrapper label {
    margin-bottom: 0;
}

.task-selector-wrapper select {
    width: auto;
    min-width: 100px;
}

/* ===== 状态区域 ===== */
.status-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.status-header h2 {
    margin: 0;
}

#status {
    background: var(--gray-100);
    padding: 12px 16px;
    border-radius: var(--radius);
    font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
    font-size: 13px;
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--gray-600);
    min-height: 48px;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--gray-200);
    margin: 0;
}

#status.processing {
    background: var(--warning-light);
    border-color: var(--warning);
    color: var(--gray-700);
    animation: processingPulse 2s ease-in-out infinite;
}

#status.completed {
    background: var(--success-light);
    border-color: var(--success);
    color: var(--gray-700);
}

#status.error {
    background: var(--danger-light);
    border-color: var(--danger);
    color: var(--gray-800);
}

@keyframes processingPulse {
    0% { background-color: #fff9e6; }
    50% { background-color: #fef3c7; }
    100% { background-color: #fff9e6; }
}

/* ===== 加载动画 ===== */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== 结果区域 ===== */
.results-container {
    margin-top: 8px;
}

.results-container h2 {
    margin-bottom: 12px;
}

/* ===== Markdown 渲染样式 ===== */
.markdown-body {
    background: #fff;
    padding: 20px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-800);
}

.markdown-body h1 {
    font-size: 22px;
    text-align: left;
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 8px;
    margin: 24px 0 16px;
}

.markdown-body h2 {
    font-size: 18px;
    color: var(--primary-dark);
    border-bottom: 1px solid var(--gray-200);
    padding-bottom: 6px;
    margin: 20px 0 12px;
}

.markdown-body h3 {
    font-size: 16px;
    color: var(--gray-700);
    margin: 16px 0 10px;
}

.markdown-body h4 {
    font-size: 15px;
    color: var(--gray-600);
    margin: 14px 0 8px;
}

.markdown-body p {
    margin: 0 0 12px 0;
}

.markdown-body ul,
.markdown-body ol {
    margin: 0 0 12px 0;
    padding-left: 24px;
}

.markdown-body li {
    margin-bottom: 6px;
}

.markdown-body blockquote {
    margin: 12px 0;
    padding: 12px 16px;
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--gray-700);
}

.markdown-body blockquote p:last-child {
    margin-bottom: 0;
}

.markdown-body code {
    font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
    font-size: 13px;
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--danger);
}

.markdown-body pre {
    background: var(--gray-900);
    color: var(--gray-100);
    padding: 16px;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.6;
    margin: 12px 0;
}

.markdown-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: 20px 0;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 14px;
}

.markdown-body th,
.markdown-body td {
    border: 1px solid var(--gray-300);
    padding: 8px 12px;
    text-align: left;
}

.markdown-body th {
    background: var(--gray-100);
    font-weight: 600;
}

.markdown-body tr:nth-child(even) {
    background: var(--gray-50);
}

.markdown-body strong {
    color: var(--gray-900);
}

.markdown-body em {
    color: var(--gray-600);
}

/* ===== 环节卡片（用于区分不同分析步骤） ===== */
.section-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.section-card:last-child {
    margin-bottom: 0;
}

.section-card h3 {
    margin: 0 0 10px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-100);
}

/* 不同环节的颜色标识 */
.section-card.ta { border-left: 4px solid #3b82f6; }
.section-card.cc { border-left: 4px solid #8b5cf6; }
.section-card.lr { border-left: 4px solid #f59e0b; }
.section-card.gra { border-left: 4px solid #ef4444; }
.section-card.summary { border-left: 4px solid #10b981; }
.section-card.polish { border-left: 4px solid #06b6d4; }
.section-card.hint { border-left: 4px solid #ec4899; }

/* ===== 处理中遮罩 ===== */
.processing-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(2px);
    z-index: 1000;
    display: none;
    pointer-events: all;
    cursor: not-allowed;
    border-radius: var(--radius-lg);
}

/* ===== 提示信息 ===== */
.tip {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 4px;
}

.tip-warning {
    font-size: 13px;
    color: var(--warning);
    background: var(--warning-light);
    padding: 8px 12px;
    border-radius: var(--radius);
    margin-top: 8px;
}

/* ===== 分隔线 ===== */
hr.divider {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: 20px 0;
    width: 100%;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    body {
        padding: 12px;
    }

    h1 {
        font-size: 22px;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .tab-button {
        padding: 10px 14px;
        font-size: 13px;
    }

    .card {
        padding: 16px;
    }

    .markdown-body {
        padding: 14px;
    }
}