:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-grad: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-grad-soft: linear-gradient(135deg, rgba(102,126,234,0.08) 0%, rgba(118,75,162,0.08) 100%);
    --bg: #f3f4f8;
    --bg-card: #ffffff;
    --bg-soft: #f8fafc;
    --border: #e5e7eb;
    --border-soft: #eef0f3;
    --text: #1f2937;
    --text-soft: #6b7280;
    --text-muted: #9ca3af;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow: 0 4px 16px -4px rgba(0,0,0,0.08), 0 2px 6px -2px rgba(0,0,0,0.04);
    --shadow-lg: 0 20px 40px -10px rgba(0,0,0,0.15);
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    background-image:
        radial-gradient(at 20% 0%, rgba(102, 126, 234, 0.06) 0, transparent 50%),
        radial-gradient(at 80% 0%, rgba(118, 75, 162, 0.06) 0, transparent 50%);
    min-height: 100vh;
}

/* Header */
header {
    background: var(--primary-grad);
    color: white;
    padding: 1.25rem 0;
    box-shadow: 0 4px 20px -4px rgba(102, 126, 234, 0.3);
}

nav {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

h1 { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; }

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    padding: 0.25rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.github-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    height: 34px;
    padding: 0 0.95rem;
    background: transparent;
    color: white;
    text-decoration: none;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}
.github-btn:hover {
    background: rgba(255, 255, 255, 0.18);
}
.github-btn svg {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.language-selector { display: flex; align-items: center; }
.language-selector select {
    height: 34px;
    padding: 0 2rem 0 0.85rem;
    border: none;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--text);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    line-height: 1;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.55rem center;
    background-size: 0.85rem;
    appearance: none;
    transition: var(--transition);
}
.language-selector select:hover {
    background-color: white;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}
.language-selector select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.35);
}

/* Tool description */
.tool-description {
    background: transparent;
    color: var(--text);
    padding: 1.5rem 2rem 0.5rem;
    text-align: center;
    margin-bottom: 1rem;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
}
.description-content p {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-soft);
    font-weight: 400;
}

/* Main */
main {
    max-width: 1280px;
    margin: 1rem auto 2rem;
    padding: 0 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.config-section, .results-section {
    background: var(--bg-card);
    padding: 1.75rem 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-soft);
}

h2 {
    color: var(--text);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 20px;
    background: var(--primary-grad);
    border-radius: 2px;
}

/* Form */
.form-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}
.form-group { margin-bottom: 1.25rem; }

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.875rem;
}

.form-hint {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

input, select, textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: white;
    color: var(--text);
    transition: var(--transition);
    font-family: inherit;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

textarea {
    resize: vertical;
    min-height: 60px;
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    font-size: 0.85rem;
}

select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 1rem;
    padding-right: 2.2rem;
    appearance: none;
}

/* Buttons */
.action-row {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

#startTest, .btn-primary {
    background: var(--primary-grad);
    color: white;
    border: none;
    padding: 0.75rem 1.75rem;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    box-shadow: 0 4px 12px -4px rgba(102, 126, 234, 0.5);
}
#startTest:hover:not(:disabled), .btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px -4px rgba(102, 126, 234, 0.6);
}
#startTest:disabled, .btn-primary:disabled {
    background: #d1d5db;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 1.5px solid var(--primary);
    padding: 0.55rem 1.1rem;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}
.btn-secondary:hover:not(:disabled) {
    background: var(--primary);
    color: white;
}
.btn-secondary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-danger {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.65rem 1.25rem;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}
.btn-danger:hover { background: #dc2626; transform: translateY(-1px); }

.btn-link {
    background: transparent;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.825rem;
    font-weight: 500;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    transition: var(--transition);
}
.btn-link:hover { background: var(--primary-grad-soft); }
.btn-link-danger { color: var(--danger); }
.btn-link-danger:hover { background: rgba(239, 68, 68, 0.08); }

.endpoint-row {
    display: flex;
    gap: 0.5rem;
    align-items: stretch;
}
.endpoint-select {
    flex: 1;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.825rem !important;
}

/* Models toolbar & list */
.models-toolbar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
    flex-wrap: wrap;
    align-items: center;
}
.model-filter {
    flex: 1;
    min-width: 160px;
    padding: 0.45rem 0.75rem !important;
    font-size: 0.85rem !important;
}

.fetch-status {
    font-size: 0.8rem;
    margin-left: auto;
    color: var(--text-soft);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
}
.fetch-status.success { color: var(--success); background: rgba(16,185,129,0.08); }
.fetch-status.error { color: var(--danger); background: rgba(239,68,68,0.08); }
.fetch-status.warning { color: var(--warning); background: rgba(245,158,11,0.08); }

.model-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.4rem;
    padding: 0.85rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    max-height: 280px;
    overflow-y: auto;
    background: var(--bg-soft);
}
.model-list-empty {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    padding: 1.5rem;
    font-size: 0.9rem;
}

.model-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.15s ease;
    font-size: 0.825rem;
    background: white;
    border: 1px solid var(--border-soft);
    margin: 0;
    font-weight: 500;
}
.model-item:hover { background: var(--primary-grad-soft); border-color: var(--primary-light); }
.model-item input[type=checkbox] { width: auto; margin: 0; cursor: pointer; accent-color: var(--primary); }
.model-item span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.78rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    font-size: 0.875rem;
}
th, td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-soft);
}
th {
    background: var(--bg-soft);
    font-weight: 600;
    color: var(--text-soft);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    position: sticky;
    top: 0;
    z-index: 10;
}
tr:hover { background: var(--primary-grad-soft); }
tr:last-child td { border-bottom: none; }

td { vertical-align: middle; }

.prompt-cell {
    max-width: 240px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.8rem;
    color: var(--text-soft);
}

/* Status indicators */
.status-cell { font-weight: 600; font-size: 0.85rem; }
.status-testing { color: var(--warning); }
.status-completed { color: var(--success); }
.status-failed { color: var(--danger); }

.error-cell {
    color: var(--danger);
    font-size: 0.8rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 2px solid rgba(245, 158, 11, 0.25);
    border-top-color: var(--warning);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: -2px;
    margin-right: 0.3rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Results header */
.results-header, .section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.results-header h2, .section-header h2 { margin-bottom: 0; }

.toggle-viewer-btn {
    background: var(--primary-grad);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 2px 8px -2px rgba(102, 126, 234, 0.4);
}
.toggle-viewer-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px -2px rgba(102, 126, 234, 0.5);
}

/* Realtime viewer (drawer) */
.realtime-viewer {
    position: fixed;
    top: 0;
    right: 0;
    width: 460px;
    max-width: 100vw;
    height: 100vh;
    background: white;
    box-shadow: -10px 0 40px -10px rgba(0,0,0,0.2);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}
.realtime-viewer.visible { transform: translateX(0); }
.hidden { display: none !important; }
.realtime-viewer.hidden { display: flex !important; transform: translateX(100%); }

.viewer-header {
    background: var(--primary-grad);
    color: white;
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}
.viewer-header h3 { font-size: 1rem; font-weight: 600; margin: 0; }
.close-btn {
    background: rgba(255,255,255,0.15);
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}
.close-btn:hover { background: rgba(255,255,255,0.3); transform: rotate(90deg); }

.viewer-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.viewer-selector-row {
    padding: 0.75rem 1.25rem;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border-soft);
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-shrink: 0;
}
.viewer-selector-row label { margin: 0; font-size: 0.8rem; color: var(--text-soft); }
.viewer-selector {
    flex: 1;
    padding: 0.4rem 0.6rem !important;
    font-size: 0.825rem !important;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
}

.current-test-info {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-soft);
    flex-shrink: 0;
}
.test-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
    font-size: 0.825rem;
    flex-wrap: wrap;
}
.test-model {
    background: var(--primary-grad);
    color: white;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-weight: 600;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.75rem;
}
.test-round {
    background: var(--bg-soft);
    color: var(--text-soft);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.75rem;
}
.test-status {
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.test-status.testing { background: rgba(245,158,11,0.15); color: #b45309; }
.test-status.completed { background: rgba(16,185,129,0.15); color: #047857; }
.test-status.failed { background: rgba(239,68,68,0.15); color: #b91c1c; }
.test-separator { color: var(--text-muted); }

.test-prompt {
    font-size: 0.825rem;
    color: var(--text-soft);
    background: var(--bg-soft);
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    border-left: 3px solid var(--primary);
    line-height: 1.5;
    max-height: 80px;
    overflow-y: auto;
}

.result-display {
    flex: 1;
    padding: 1rem 1.25rem;
    overflow-y: auto;
    background: #fafbfc;
    position: relative;
}
.result-text {
    font-family: 'SF Mono', Monaco, Consolas, 'Cascadia Code', monospace;
    font-size: 0.825rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text);
    min-height: 80px;
}
.result-cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: var(--primary);
    animation: blink 1s infinite;
    margin-left: 2px;
    vertical-align: -0.1em;
}
@keyframes blink { 0%,50% { opacity: 1; } 51%,100% { opacity: 0; } }

.viewer-stats {
    padding: 0.85rem 1.25rem;
    background: var(--bg-soft);
    border-top: 1px solid var(--border-soft);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    flex-shrink: 0;
}
.stat-item { text-align: center; }
.stat-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
}
.stat-value {
    display: block;
    font-weight: 700;
    color: var(--text);
    font-size: 0.95rem;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
}

/* View Result button */
.view-result-btn {
    background: var(--primary-grad);
    color: white;
    border: none;
    padding: 0.4rem 0.85rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 600;
    transition: var(--transition);
    min-width: 80px;
}
.view-result-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px -2px rgba(102, 126, 234, 0.5);
}
.view-result-btn:disabled { background: #d1d5db; cursor: not-allowed; opacity: 0.7; }
.view-result-btn.error-state { background: linear-gradient(135deg, #ef4444, #dc2626); }
.view-result-btn.testing-state {
    background: #d1d5db;
    color: #6b7280;
    animation: pulse 1.6s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.55; } }

/* Statistics */
#statisticsTable .stats-success-rate.high { color: var(--success); }
#statisticsTable .stats-success-rate.medium { color: var(--warning); }
#statisticsTable .stats-success-rate.low { color: var(--danger); }
#statisticsTable .stats-success-rate { font-weight: 700; }

/* History */
.history-controls { display: flex; gap: 0.5rem; }
.history-empty {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
    font-style: italic;
    background: var(--bg-soft);
    border-radius: var(--radius-sm);
}
.history-record {
    background: white;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}
.history-record:hover { box-shadow: var(--shadow); }
.history-header {
    background: var(--bg-soft);
    padding: 0.85rem 1.1rem;
    border-bottom: 1px solid var(--border-soft);
}
.history-header h3 {
    margin: 0 0 0.4rem 0;
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 700;
}
.history-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    font-size: 0.8rem;
    color: var(--text-soft);
}
.history-meta strong { color: var(--text); margin-right: 0.3rem; font-weight: 600; }
.history-summary {
    padding: 0.75rem 1.1rem;
    background: white;
    border-bottom: 1px solid var(--border-soft);
}
.summary-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    font-size: 0.825rem;
}
.summary-stats strong { color: var(--text); margin-right: 0.3rem; font-weight: 600; }
.history-details { padding: 0.5rem 0; }
.history-table { font-size: 0.825rem; }
.history-table th, .history-table td { padding: 0.55rem 1.1rem; }

/* Toast notification */
.toast-notification {
    position: fixed;
    top: 24px;
    right: 24px;
    background: var(--text);
    color: white;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-sm);
    z-index: 10000;
    max-width: 360px;
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
}
.toast-notification.show { transform: translateX(0); }

/* Tooltip */
.tooltip-icon {
    margin-left: 5px;
    cursor: help;
    font-size: 0.85em;
    opacity: 0.6;
    transition: opacity 0.2s ease;
}
.tooltip-icon:hover { opacity: 1; }

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* RTL */
[dir="rtl"] { text-align: right; }
[dir="rtl"] nav { flex-direction: row-reverse; }
[dir="rtl"] .realtime-viewer {
    right: auto;
    left: 0;
    transform: translateX(-100%);
    box-shadow: 10px 0 40px -10px rgba(0,0,0,0.2);
}
[dir="rtl"] .realtime-viewer.visible { transform: translateX(0); }

/* Responsive */
@media (max-width: 900px) {
    .form-row { grid-template-columns: 1fr; }
    main { padding: 0 1rem; }
    .config-section, .results-section { padding: 1.25rem; }
    nav { padding: 0 1rem; }
    .realtime-viewer { width: 100%; }
}

@media (max-width: 640px) {
    h1 { font-size: 1.3rem; }
    th, td { padding: 0.6rem 0.5rem; font-size: 0.8rem; }
    .prompt-cell { max-width: 120px; }
    .toast-notification { right: 12px; left: 12px; max-width: none; }
    .summary-stats, .history-meta { flex-direction: column; gap: 0.4rem; }
    .model-list { grid-template-columns: 1fr; }
}