/* 英语作文智能评改系统 - 公共样式 */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background: var(--card);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    padding: 24px;
    margin-bottom: 20px;
}

h1, h2, h3 {
    margin-top: 0;
    color: var(--text);
}

.brand {
    color: var(--primary);
    font-weight: 700;
}

.form-group {
    margin-bottom: 16px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text);
}

input[type="text"],
input[type="password"],
input[type="tel"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.2s;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
}

button, .btn {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

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

button:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

.btn-secondary {
    background: #fff;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background: #eef2ff;
}

.links {
    margin-top: 16px;
    text-align: center;
}

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

.message {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
    display: none;
}

.message.success {
    background: #d1fae5;
    color: #065f46;
    display: block;
}

.message.error {
    background: #fee2e2;
    color: #991b1b;
    display: block;
}

.message.info {
    background: #dbeafe;
    color: #1e40af;
    display: block;
}

.navbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links a {
    margin-left: 20px;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary);
}

.task-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.task-card {
    background: var(--card);
    border-radius: 10px;
    padding: 16px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: box-shadow 0.2s;
}

.task-card:hover {
    box-shadow: 0 6px 12px rgba(0,0,0,0.08);
}

.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-pending { background: #f3f4f6; color: #6b7280; }
.status-processing { background: #dbeafe; color: #1e40af; }
.status-completed { background: #d1fae5; color: #065f46; }
.status-completed_partial { background: #fef3c7; color: #92400e; }
.status-failed { background: #fee2e2; color: #991b1b; }

.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    color: var(--text-muted);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: #eef2ff;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.preview-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.preview-item img {
    width: 100%;
    height: 120px;
    object-fit: cover;
}

.score-board {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin: 20px 0;
}

.score-card {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: #fff;
    border-radius: 12px;
    padding: 20px;
    min-width: 140px;
    text-align: center;
}

.score-card .score-value {
    font-size: 36px;
    font-weight: 700;
}

.score-card .score-label {
    font-size: 14px;
    opacity: 0.9;
}

.paper-result {
    background: var(--card);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 20px;
    margin-bottom: 20px;
}

.paper-result h4 {
    margin-top: 0;
    color: var(--primary);
}

.dimension-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
}

.dimension-table th,
.dimension-table td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: left;
}

.dimension-table th {
    background: #f9fafb;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 8px 0;
}

.tag {
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 13px;
}

.tag-good { background: #d1fae5; color: #065f46; }
.tag-bad { background: #fee2e2; color: #991b1b; }

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 12px;
}

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

@media (max-width: 640px) {
    .container { padding: 12px; }
    .card { padding: 16px; }
    .navbar .container { flex-direction: column; align-items: flex-start; }
    .nav-links { margin-top: 10px; }
    .nav-links a { margin-left: 0; margin-right: 16px; }
}