:root {
    --bg-main: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-alt: #F1F5F9;
    --text-main: #0F172A;
    --text-muted: #64748B;
    --border-color: #E2E8F0;
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --success: #10B981;
    --success-bg: #D1FAE5;
    --danger: #EF4444;
    --danger-bg: #FEE2E2;
    --warning: #F59E0B;
    --warning-bg: #FEF3C7;
    --info: #0EA5E9;
    --info-bg: #E0F2FE;
    --purple: #8B5CF6;
    --purple-bg: #EDE9FE;
    --dark: #334155;
    --dark-bg: #E2E8F0;
}

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

html, body {
    height: 100%;
    margin: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-y: auto;
}

body.scroll-lock {
    overflow: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body.scroll-lock .container {
    height: 100vh;
}

header#main-header {
    text-align: center;
    flex-shrink: 0;
    margin-bottom: 1rem;
}

header#main-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-main);
}

header#main-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* UPLOAD SECTION */
#upload-section {
    flex-shrink: 0;
}
.upload-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.upload-box {
    background: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 130px;
}

.upload-box:hover {
    border-color: var(--primary);
    background: #F8FAFC;
}

.upload-box h3 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.upload-box p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.upload-btn {
    background: var(--bg-alt);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.75rem;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s;
}

.upload-btn:hover { background: #E2E8F0; }

.upload-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.status-icon { font-weight: 600; font-size: 0.9rem; }
.success-text { color: var(--success); }
.status-details { font-size: 0.75rem; color: var(--text-muted); }

.replace-btn {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 0.75rem;
    cursor: pointer;
    text-decoration: underline;
    margin-top: 0.25rem;
}

.upload-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    margin-bottom: 1rem;
}

#upload-counter {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s;
}

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

.error {
    background: var(--danger-bg);
    color: var(--danger);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    text-align: center;
    font-weight: 500;
}

/* TABS */
#dashboard-section {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.tabs-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    flex-shrink: 0;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px; /* overlap border */
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-muted);
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content-area {
    flex: 1;
    overflow-y: auto;
    padding-right: 0.5rem; /* Space for scrollbar */
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* DASHBOARD PANELS */
.dashboard-panel {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.dashboard-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

/* KPIs */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.kpi-card {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.kpi-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.kpi-value {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.025em;
    overflow-wrap: break-word;
    word-break: break-word;
}

/* TABLES */
.multi-table-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.table-card {
    background: var(--bg-alt);
    border-radius: 10px;
    padding: 1rem;
    border: 1px solid var(--border-color);
}

.table-card h4 {
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.table-container.scrollable {
    overflow-y: auto;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    max-height: 300px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    text-align: left;
}

.data-table th, .data-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-alt);
    font-weight: 600;
    color: var(--text-muted);
    position: sticky;
    top: 0;
    z-index: 10;
}

.data-table tbody tr:hover {
    background: #F8FAFC;
}

.data-table tbody tr {
    transition: background 0.2s;
}

.sortable-table th[data-sort] {
    cursor: pointer;
    user-select: none;
}
.sortable-table th[data-sort]:hover {
    background: #E2E8F0;
    color: var(--text-main);
}

/* LISTS */
.term-list {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
}

.term-list.scrollable {
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem;
    background: var(--bg-alt);
}

.term-item {
    padding: 0.75rem;
    background: var(--bg-card);
    border-radius: 6px;
    margin-bottom: 0.5rem;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.term-item:last-child { margin-bottom: 0; }
.term-item:hover { border-color: var(--primary); }

.term-item.struck-off {
    opacity: 0.4;
    text-decoration: line-through;
    background: var(--bg-main);
    border-color: var(--border-color);
}
.term-item.struck-off .term-name {
    color: var(--text-muted);
}

.term-name {
    font-weight: 600;
    color: var(--text-main);
    flex: 1;
    padding-right: 1rem;
    word-break: break-word;
    font-size: 0.9rem;
}

.term-metrics {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    align-items: center;
    justify-content: flex-end;
}

/* COLORS & UTILS */
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.metric-bad { color: var(--danger); font-weight: 600; }
.metric-good { color: var(--success); font-weight: 600; }
.hidden { display: none !important; }

/* STATUS PILLS */
.status-pill {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.status-pill.danger { background: var(--danger-bg); color: var(--danger); }
.status-pill.success { background: var(--success-bg); color: var(--success); }
.status-pill.warning { background: var(--warning-bg); color: var(--warning); }
.status-pill.info { background: var(--info-bg); color: var(--info); }
.status-pill.purple { background: var(--purple-bg); color: var(--purple); }
.status-pill.dark { background: var(--dark-bg); color: var(--dark); }

/* SUMMARY & INTEGRITY */
.summary-panel {
    background: linear-gradient(135deg, #F8FAFC 0%, #E0F2FE 100%);
    border: 1px solid #BAE6FD;
}
.summary-text p { margin-bottom: 0.75rem; font-size: 0.95rem; }
.summary-text strong { color: var(--text-main); }

.info-panel {
    background: var(--bg-alt);
    padding: 1rem 1.5rem;
}
.integrity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.integrity-grid strong { color: var(--text-main); }

/* MODAL */
.modal {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 2rem;
}

.modal-content {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    width: 100%;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.close-btn:hover { color: var(--text-main); }

.campaign-list {
    list-style: none;
}
.campaign-list li {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
}
.campaign-list li:last-child { border-bottom: none; }

/* CALCULATOR */
.calc-input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    width: 150px;
    text-align: right;
}
.calc-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}