/* SAF-T Validator — Clean, professional styling */
:root {
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-muted: #6c757d;
    --border: #dee2e6;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --success-bg: #dcfce7;
    --error: #dc2626;
    --error-bg: #fee2e2;
    --warning: #d97706;
    --warning-bg: #fef3c7;
    --info: #2563eb;
    --info-bg: #dbeafe;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
}

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

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
.site-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.site-header h1 span.version {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-muted);
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.15s;
}

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

.lang-switcher {
    display: flex;
    gap: 4px;
    margin-left: 8px;
    border-left: 1px solid var(--border);
    padding-left: 16px;
}

.lang-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 12px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.15s;
}

.lang-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.lang-btn:hover:not(.active) {
    border-color: var(--primary);
    color: var(--primary);
}

/* Main content */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* Upload zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--card-bg);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary);
    background: var(--info-bg);
}

.upload-zone .icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.5;
}

.upload-zone h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.upload-zone p {
    color: var(--text-muted);
    font-size: 14px;
}

.file-input { display: none; }

/* File selected state */
.file-info {
    display: none;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-top: 16px;
    align-items: center;
    justify-content: space-between;
}

.file-info.visible { display: flex; }

.file-info .file-details {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-info .file-icon {
    font-size: 24px;
    opacity: 0.6;
}

.file-info .file-name {
    font-weight: 600;
    font-size: 14px;
}

.file-info .file-size {
    color: var(--text-muted);
    font-size: 13px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

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

.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

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

/* Progress */
.progress-section {
    display: none;
    text-align: center;
    padding: 48px 24px;
}

.progress-section.visible { display: block; }

.spinner {
    width: 40px;
    height: 40px;
    border: 3px 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); } }

/* Results */
.results-section {
    display: none;
}

.results-section.visible { display: block; }

/* Summary card */
.summary-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
}

.summary-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.summary-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
}

.summary-badge.valid {
    background: var(--success-bg);
    color: var(--success);
}

.summary-badge.invalid {
    background: var(--error-bg);
    color: var(--error);
}

.summary-counters {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.counter {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
}

.counter.errors { background: var(--error-bg); color: var(--error); }
.counter.warnings { background: var(--warning-bg); color: var(--warning); }
.counter.infos { background: var(--info-bg); color: var(--info); }

.summary-meta {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.meta-item {
    font-size: 13px;
}

.meta-item .label {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.meta-item .value {
    font-weight: 600;
}

/* Filters */
.filters-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--card-bg);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.filter-btn:hover:not(.active) {
    border-color: var(--primary);
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    outline: none;
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Message groups (accordions) */
.message-group {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 8px;
    overflow: hidden;
}

.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}

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

.group-title {
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.group-count {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 10px;
}

.group-chevron {
    transition: transform 0.2s;
    color: var(--text-muted);
}

.message-group.open .group-chevron {
    transform: rotate(180deg);
}

.group-body {
    display: none;
    border-top: 1px solid var(--border);
}

.message-group.open .group-body {
    display: block;
}

/* Individual messages */
.message-item {
    display: flex;
    gap: 12px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--bg);
    font-size: 13px;
    align-items: flex-start;
}

.message-item:last-child { border-bottom: none; }

.severity-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 6px;
    flex-shrink: 0;
}

.severity-dot.error { background: var(--error); }
.severity-dot.warning { background: var(--warning); }
.severity-dot.info { background: var(--info); }

.message-content { flex: 1; }

.message-code {
    font-family: 'SF Mono', SFMono-Regular, Consolas, monospace;
    font-size: 11px;
    color: var(--text-muted);
    background: var(--bg);
    padding: 1px 6px;
    border-radius: 3px;
    margin-right: 6px;
}

.message-text { color: var(--text); }

.message-details {
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-muted);
}

.message-details .xpath {
    font-family: 'SF Mono', SFMono-Regular, Consolas, monospace;
    font-size: 11px;
}

.message-details .reference {
    font-style: italic;
}

.message-details .xml-line {
    font-family: 'SF Mono', SFMono-Regular, Consolas, monospace;
    font-size: 10px;
    font-weight: 600;
    color: var(--primary);
    background: var(--info-bg);
    padding: 1px 6px;
    border-radius: 3px;
    white-space: nowrap;
}

.message-expected-actual {
    display: flex;
    gap: 16px;
    margin-top: 4px;
    font-size: 12px;
}

.expected, .actual {
    font-family: 'SF Mono', SFMono-Regular, Consolas, monospace;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 3px;
}

.expected { background: var(--success-bg); color: var(--success); }
.actual { background: var(--error-bg); color: var(--error); }

/* Actions bar */
.actions-bar {
    display: flex;
    gap: 8px;
    margin-top: 20px;
    justify-content: center;
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
    margin-top: 48px;
}

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

/* Requirements page */
.requirements-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.requirements-table th {
    background: var(--bg);
    text-align: left;
    padding: 10px 14px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.requirements-table td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--bg);
    vertical-align: top;
}

.requirements-table tr:last-child td { border-bottom: none; }

.requirements-table tr:hover td { background: var(--bg); }

.severity-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}

.severity-tag.error { background: var(--error-bg); color: var(--error); }
.severity-tag.warning { background: var(--warning-bg); color: var(--warning); }
.severity-tag.info { background: var(--info-bg); color: var(--info); }

/* Layer filter tabs */
.layer-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 768px) {
    .container { padding: 16px; }
    .upload-zone { padding: 32px 16px; }
    .summary-meta { grid-template-columns: 1fr 1fr; }
    .file-info { flex-direction: column; gap: 12px; align-items: flex-start; }
    .filters-bar { flex-direction: column; }
    .search-input { min-width: auto; width: 100%; }
}