:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --success: #16a34a;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

main {
    flex: 1;
    padding: 32px 0;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    margin-bottom: 6px;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.header-dept {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.header-dept:hover {
    color: var(--primary);
}

.card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 32px;
}

h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    margin-top: 24px;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 24px;
}

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

.file-label {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 32px;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    font-weight: 500;
    color: var(--text-muted);
}

.file-label:hover {
    border-color: var(--primary);
    background: #eff6ff;
}

.file-label input[type="file"] {
    display: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    transition: background 0.2s, border-color 0.2s;
}

.btn:hover {
    background: var(--bg);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}

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

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1e40af;
}

.alert-error {
    background: var(--error-bg);
    border-color: #fecaca;
    color: var(--error);
}

.alert-warning {
    background: #fffbeb;
    border-color: #fde68a;
    color: #92400e;
}

.info-block {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.info-block ul {
    list-style: none;
    padding: 0;
}

.info-block li {
    padding: 4px 0;
    font-size: 14px;
    color: var(--text-muted);
}

.info-block li::before {
    content: "✓ ";
    color: var(--success);
    font-weight: 700;
}

.info-link-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.info-link-row p {
    margin: 0;
}

.result-summary {
    display: flex;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.result-stat {
    text-align: center;
}

.result-number {
    display: block;
    font-size: 48px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.result-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.result-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.status-block {
    text-align: center;
    padding: 48px 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

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

.preview-section {
    margin-top: 24px;
}

.hint {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.pdf-preview-container {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    height: 80vh;
    background: #525659;
}

code {
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.error-page {
    text-align: center;
    padding: 48px 32px;
}

.error-page h1 {
    font-size: 72px;
    font-weight: 800;
    color: var(--error);
    margin-bottom: 8px;
}

.error-detail {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

@media (max-width: 640px) {
    .card {
        padding: 20px;
    }

    .result-summary {
        flex-direction: column;
        text-align: center;
    }

    .result-actions {
        justify-content: center;
    }
}