:root {
    --sidebar-width: 250px;
    --sidebar-bg: #f3f4f6;
    --main-bg: #ffffff;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --accent: #6366f1;
    --accent-hover: #5558e6;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--main-bg);
    color: var(--text-primary);
    font-size: 14px;
}

.app-wrapper {
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: var(--sidebar-width);
    height: 100%;
    background: var(--sidebar-bg);
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
}

.sidebar-brand {
    color: var(--text-primary) !important;
    font-size: 15px;
    padding: 8px 12px;
    border-radius: 10px;
    transition: all 0.2s;
}

.sidebar-brand:hover {
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent) !important;
}

.sidebar-brand i {
    font-size: 1.5rem;
    color: var(--accent);
}

.sidebar-link {
    color: #6b7280 !important;
    border-radius: 8px;
    padding: 10px 14px !important;
    margin-bottom: 2px;
    font-size: 14px;
    font-weight: 450;
    transition: all 0.15s;
    position: relative;
}

.sidebar-link i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
    color: #9ca3af;
    transition: color 0.15s;
}

.sidebar-link:hover {
    background: rgba(99, 102, 241, 0.08);
    color: #1f2937 !important;
}

.sidebar-link:hover i {
    color: var(--accent);
}

.sidebar-link.active {
    background: rgba(99, 102, 241, 0.1) !important;
    color: #4f46e5 !important;
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding-left: 11px !important;
}

.sidebar-link.active i {
    color: var(--accent);
}

.sidebar-link:not(.active):hover {
    padding-left: 18px !important;
}

.sidebar .nav-pills .nav-item + .nav-item {
    margin-top: 2px;
}

.sidebar .nav-pills hr {
    margin: 12px 0;
    opacity: 0.25;
    border-color: #e0e3e8;
}

.sidebar .dropdown-toggle {
    color: #6b7280 !important;
    font-weight: 450;
}

.sidebar .dropdown-toggle:hover {
    color: #1f2937 !important;
}

.main-content {
    height: 100%;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.main-content > .container-fluid,
.main-content > .container {
    flex: 1;
}

.main-content > .d-flex:first-child {
    flex-shrink: 0;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
}

.card-header {
    padding: 16px 20px 0;
}

.table > :not(caption) > * > * {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
    padding: 12px 16px;
}

.table > thead > tr > th {
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.table-hover > tbody > tr:hover {
    background: rgba(99, 102, 241, 0.04);
}

.table-dark {
    background: var(--sidebar-bg);
}

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

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

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

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

.form-control, .form-select {
    background: #f9fafb;
    border-color: var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 14px;
}

.form-control:focus, .form-select:focus {
    background: #fff;
    border-color: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-control::placeholder {
    color: #6b7280;
}

.form-text {
    color: var(--text-secondary);
    font-size: 12px;
}

.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.modal-header {
    border-bottom-color: var(--border-color);
}

.modal-footer {
    border-top-color: var(--border-color);
}

.btn-close {
    filter: none;
}

.btn-secondary {
    background: #f3f4f6;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #e5e7eb;
    border-color: var(--border-color);
    color: var(--text-primary);
}

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

.badge {
    font-weight: 500;
    letter-spacing: 0.03em;
}

.text-preview {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.prob-bar {
    display: flex;
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    width: 120px;
}

.prob-bar .segment {
    transition: width 0.5s;
}

.prob-bar .human { background: var(--success); }
.prob-bar .ai { background: var(--danger); }

.result-box {
    padding: 16px;
    border-radius: 10px;
    border: 1px solid;
}

.result-box.human { background: rgba(34, 197, 94, 0.1); border-color: rgba(34, 197, 94, 0.2); }
.result-box.ai { background: rgba(239, 68, 68, 0.1); border-color: rgba(239, 68, 68, 0.2); }
.result-box.borderline { background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.2); }

.verdict-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.verdict-tag.human { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.verdict-tag.ai { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.verdict-tag.borderline { background: rgba(245, 158, 11, 0.15); color: var(--warning); }

.author-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: var(--text-primary);
    display: block;
}

.author-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.text-item {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

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

.text-content {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.spinner-border { color: var(--accent) !important; }

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.dropdown-menu {
    background: var(--card-bg);
    border-color: var(--border-color);
}

.dropdown-item {
    color: var(--text-primary);
}

.dropdown-item:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #9ca3af; }

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.upload-zone:hover {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.05);
    color: var(--accent);
}

.upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.1);
}

.upload-zone.has-file {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.05);
}

.copyright-notice {
    color: var(--text-secondary, #6b7280);
    font-size: 13px;
    line-height: 1.6;
}
.copyright-notice strong {
    color: var(--text-primary, #1f2937);
}

@media (max-width: 768px) {
    .sidebar { display: none; }
}