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

:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --dark: #2d3748;
    --gray: #718096;
    --light-gray: #f7fafc;
    --white: #ffffff;
    --shadow: 0 10px 40px rgba(0,0,0,0.1);
    --border-radius: 16px;
    --transition: all 0.3s ease;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 16px;
    border-radius: 8px;
}

.nav-link:hover,
.nav-link.active {
    color: white;
    background: rgba(255,255,255,0.15);
}

section {
    padding: 40px 0;
}

.upload-card,
.results-card,
.history-card,
.about-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.upload-header {
    text-align: center;
    margin-bottom: 30px;
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.upload-header h2 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.upload-subtitle {
    color: var(--gray);
    font-size: 1rem;
}

.drop-zone {
    border: 3px dashed #e2e8f0;
    border-radius: var(--border-radius);
    padding: 60px 20px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    background: var(--light-gray);
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--primary);
    background: #edf2ff;
}

.drop-zone-content {
    pointer-events: none;
}

.drop-icon {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.drop-zone p {
    font-size: 1.2rem;
    color: var(--dark);
}

.file-link {
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    pointer-events: all;
}

#fileInput {
    display: none;
}

.file-info {
    margin-top: 15px;
    padding: 12px 20px;
    background: white;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.file-info i {
    color: var(--primary);
}

.upload-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 25px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--dark);
}

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

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

.progress-container {
    margin-top: 25px;
    display: none;
}

.progress-container.active {
    display: block;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--light-gray);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 10px;
    transition: width 0.5s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    margin-top: 10px;
    color: var(--gray);
    font-size: 0.95rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
}

.results-header h2 {
    font-size: 1.5rem;
}

.results-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

.result-card {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 25px;
    text-align: center;
    transition: var(--transition);
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.05);
}

.result-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.result-card h3 {
    font-size: 1.1rem;
    color: var(--gray);
    margin-bottom: 10px;
}

.result-score {
    font-size: 3rem;
    font-weight: 700;
    margin: 10px 0;
}

.result-card .progress-bar {
    height: 6px;
    background: #e2e8f0;
    margin: 10px 0;
}

.result-card .progress-fill {
    border-radius: 10px;
    transition: width 1s ease;
}

.plagiarism-card .result-score {
    color: var(--primary);
}
.plagiarism-card .progress-fill {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.ai-card .result-score {
    color: var(--secondary);
}
.ai-card .progress-fill {
    background: linear-gradient(90deg, var(--secondary), #9f7aea);
}

.result-status {
    margin: 10px 0;
}

.badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}
.badge-danger {
    background: #f8d7da;
    color: #721c24;
}
.badge-warning {
    background: #fff3cd;
    color: #856404;
}
.badge-info {
    background: #d1ecf1;
    color: #0c5460;
}

.result-details {
    display: flex;
    justify-content: space-around;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e2e8f0;
    font-size: 0.9rem;
    color: var(--gray);
}

.result-details strong {
    color: var(--dark);
}

.detailed-analysis {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 25px;
    margin: 20px 0;
}

.detailed-analysis h3 {
    margin-bottom: 15px;
}

.analysis-details {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .analysis-details {
        grid-template-columns: 1fr;
    }
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.detail-label {
    font-size: 0.85rem;
    color: var(--gray);
}

.detail-value {
    font-weight: 600;
    font-size: 1.1rem;
}

.text-preview {
    margin-top: 20px;
}

.text-preview h3 {
    margin-bottom: 15px;
}

.preview-content {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 20px;
    max-height: 200px;
    overflow-y: auto;
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--dark);
    white-space: pre-wrap;
    word-break: break-word;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
}

.history-header h2 {
    font-size: 1.5rem;
}

.history-list {
    min-height: 100px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #e2e8f0;
    transition: var(--transition);
}

.history-item:hover {
    background: var(--light-gray);
    padding-left: 10px;
    padding-right: 10px;
    border-radius: 8px;
}

.history-item .file-name {
    font-weight: 600;
    color: var(--dark);
}

.history-item .file-date {
    font-size: 0.85rem;
    color: var(--gray);
}

.history-item .file-type {
    font-size: 0.8rem;
    color: var(--gray);
    background: var(--light-gray);
    padding: 2px 10px;
    border-radius: 12px;
}

.history-item .scores {
    display: flex;
    gap: 20px;
    align-items: center;
}

.history-item .score {
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 500;
}

.score-plagiarism {
    color: var(--primary);
}

.score-ai {
    color: var(--secondary);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 10px;
    opacity: 0.5;
}

.empty-sub {
    font-size: 0.9rem;
    margin-top: 5px;
    opacity: 0.7;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 30px;
    margin-top: 30px;
}

@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 600px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}

.about-item {
    text-align: center;
    padding: 20px;
}

.about-item i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.about-item h3 {
    margin-bottom: 10px;
}

.about-item p {
    color: var(--gray);
    font-size: 0.95rem;
}

.footer {
    background: var(--dark);
    color: white;
    padding: 30px 0;
    text-align: center;
}

.footer-version {
    opacity: 0.6;
    font-size: 0.85rem;
    margin-top: 5px;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    opacity: 0.8;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: center;
    }
    
    .nav {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .upload-card,
    .results-card,
    .history-card,
    .about-card {
        padding: 20px;
    }
    
    .drop-zone {
        padding: 40px 20px;
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }
}


.method-details {
    margin-top: 30px;
    padding: 20px 24px;
    background: #f8f9fa;
    border-radius: 12px;
    border-left: 4px solid #4f46e5;
}

.method-details h3 {
    font-size: 18px;
    color: #1a1a2e;
    margin-bottom: 12px;
}

.method-details h3 i {
    color: #4f46e5;
    margin-right: 10px;
}

.method-info {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.method-badge {
    display: inline-block;
    padding: 4px 14px;
    background: #e8eaf6;
    color: #4f46e5;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.method-description {
    color: #555;
    font-size: 14px;
    margin: 0;
    padding: 8px 12px;
    background: white;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

/* =========================================================
   Детальный отчёт — табы, предложения, источники, AI-маркеры
   ========================================================= */

.report-details {
    margin-top: 32px;
    padding: 24px;
    background: #f8f9fc;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
}

.report-details h3 {
    margin: 0 0 16px;
    font-size: 1.15rem;
    color: #1f2937;
}

.report-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
    border-bottom: 2px solid #e5e7eb;
    flex-wrap: wrap;
}

.report-tabs .tab {
    padding: 10px 18px;
    border: none;
    background: transparent;
    color: #6b7280;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: color .2s, border-color .2s;
}

.report-tabs .tab:hover { color: #4f46e5; }

.report-tabs .tab.active {
    color: #4f46e5;
    border-bottom-color: #4f46e5;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* --- Предложения --- */
.sentence-summary {
    margin-bottom: 12px;
    padding: 10px 14px;
    background: #eef2ff;
    border-radius: 8px;
    color: #3730a3;
    font-size: 0.9rem;
}

.sentence-list {
    max-height: 520px;
    overflow-y: auto;
    padding-right: 6px;
}

.sentence-item {
    display: grid;
    grid-template-columns: 48px 1fr auto;
    gap: 12px;
    align-items: flex-start;
    padding: 12px 14px;
    margin-bottom: 8px;
    background: #fff;
    border-radius: 8px;
    border-left: 3px solid #d1d5db;
    font-size: 0.92rem;
    line-height: 1.45;
}

.sentence-item.flagged {
    border-left-color: #ef4444;
    background: #fef2f2;
}

.sentence-index {
    font-weight: 600;
    color: #6b7280;
    font-size: 0.85rem;
    padding-top: 2px;
}

.sentence-text {
    margin: 0;
    color: #374151;
    word-break: break-word;
}

.sentence-badges {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: flex-end;
}

.badge-mini {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
    white-space: nowrap;
}

.badge-plag { background: #fee2e2; color: #991b1b; }
.badge-ai   { background: #ede9fe; color: #5b21b6; }

/* --- Источники --- */
.sources-list { display: flex; flex-direction: column; gap: 10px; }

.source-item {
    padding: 12px 16px;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
}

.source-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 4px;
}

.source-title {
    color: #4f46e5;
    font-weight: 500;
    text-decoration: none;
    word-break: break-all;
}

.source-title:hover { text-decoration: underline; }

.source-match {
    font-size: 0.8rem;
    font-weight: 700;
    color: #dc2626;
    background: #fef2f2;
    padding: 2px 8px;
    border-radius: 10px;
    white-space: nowrap;
}

.source-snippet {
    margin: 6px 0 0;
    font-size: 0.85rem;
    color: #6b7280;
    line-height: 1.4;
}

/* --- AI-маркеры --- */
.marker-group { margin-bottom: 20px; }
.marker-group h4 {
    margin: 0 0 10px;
    font-size: 0.95rem;
    color: #4b5563;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.marker-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.marker-chip {
    padding: 6px 12px;
    background: #ede9fe;
    color: #5b21b6;
    border-radius: 16px;
    font-size: 0.85rem;
    font-weight: 500;
}

.pattern-list {
    margin: 0;
    padding-left: 20px;
    color: #374151;
    font-size: 0.9rem;
}

.pattern-list li { margin-bottom: 4px; }

/* --- Пустое состояние --- */
.empty {
    padding: 20px;
    text-align: center;
    color: #9ca3af;
    font-size: 0.9rem;
    background: #fff;
    border-radius: 8px;
    border: 1px dashed #e5e7eb;
}

/* --- История: подсветка --- */
.history-item .score.good { background: #dcfce7; color: #166534; }
.history-item .score.warn { background: #fef3c7; color: #92400e; }
.history-item .score.bad  { background: #fee2e2; color: #991b1b; }

.history-meta {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-top: 4px;
    font-size: 0.82rem;
    color: #6b7280;
}


/* ===== Авторизация ===== */
.header-content { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.auth-block { display: flex; align-items: center; gap: 10px; }
#authGuest { display: inline-flex; gap: 8px; }
#authUser { display: inline-flex; align-items: center; gap: 12px; }
.user-email { color: #fff; font-size: 0.9rem; opacity: 0.9; }

.modal-backdrop {
    position: fixed; inset: 0; background: rgba(0,0,0,0.5);
    display: flex; align-items: center; justify-content: center; z-index: 9999;
}
.modal {
    background: #fff; border-radius: 12px; padding: 32px;
    width: 100%; max-width: 420px; box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    position: relative;
}
.modal h2 { margin: 0 0 20px; color: #1f2937; }
.modal label { display: block; margin-bottom: 14px; font-weight: 500; color: #374151; font-size: 0.9rem; }
.modal input {
    display: block; width: 100%; margin-top: 6px; padding: 10px 12px;
    border: 1px solid #d1d5db; border-radius: 8px; font-size: 1rem; box-sizing: border-box;
}
.modal input:focus { outline: none; border-color: #4f46e5; box-shadow: 0 0 0 3px rgba(79,70,229,0.15); }
.modal-close {
    position: absolute; top: 12px; right: 16px; background: none; border: none;
    font-size: 24px; cursor: pointer; color: #9ca3af;
}
.modal-close:hover { color: #374151; }
.auth-error { color: #dc2626; font-size: 0.85rem; min-height: 20px; margin-bottom: 12px; }
.auth-switch { margin-top: 16px; text-align: center; font-size: 0.9rem; color: #6b7280; }
.auth-switch a { color: #4f46e5; text-decoration: none; font-weight: 500; }


/* ============ AUTH — закреплено справа сверху ============ */
.auth-block {
    position: fixed;
    top: 12px;
    right: 20px;
    z-index: 1100;
    display: flex;
    align-items: center;
    gap: 10px;
}

#authGuest {
    display: flex;
    gap: 8px;
}

#authGuest .btn,
#authUser .btn {
    padding: 8px 16px;
    font-size: 0.9rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

#showLoginBtn {
    background: #fff;
    color: #4f46e5;
}
#showLoginBtn:hover {
    background: #eef2ff;
    transform: translateY(-1px);
}

#showRegisterBtn {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.35) !important;
}
#showRegisterBtn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
}

#authUser {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.15);
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}
.user-email {
    color: #fff;
    font-size: 0.9rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
#logoutBtn {
    background: #fff;
    color: #dc2626;
    padding: 6px 12px;
    font-size: 0.85rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-weight: 500;
}
#logoutBtn:hover { background: #fee2e2; }