:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --green: #22c55e;
    --yellow: #eab308;
    --orange: #f97316;
    --red: #ef4444;
    --blue: #3b82f6;
    --purple: #a855f7;
    --cyan: #06b6d4;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.3);
}

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

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

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.2rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.1rem;
    font-weight: 700;
}

.header-right {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover { background: #2563eb; }

.btn-secondary {
    background: var(--bg-hover);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover { background: #475569; }

.btn-icon {
    background: transparent;
    color: var(--text-primary);
    font-size: 1.4rem;
    padding: 0.3rem;
}

.btn-ai-refresh {
    font-size: 1.4rem;
    padding: 0.2rem 0.4rem;
    opacity: 0.7;
    margin-left: auto;
}

.btn-ai-refresh:hover { opacity: 1; }

#ai-section h2 {
    display: flex;
    align-items: center;
}

@keyframes spin { to { transform: rotate(360deg); } }
.spinning { display: inline-block; animation: spin 1s linear infinite; }

.btn-large {
    padding: 0.75rem 2rem;
    font-size: 1rem;
}

/* Upload Zone */
.upload-zone {
    margin: 1rem 2rem;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
}

.upload-zone.dragover {
    border-color: var(--blue);
    background: rgba(59, 130, 246, 0.1);
}

.upload-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.upload-hint { color: var(--text-muted); font-size: 0.875rem; }

.upload-result {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--green);
    color: var(--green);
}

.upload-result.error {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--red);
    color: var(--red);
}

/* Score Cards */
.score-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 1rem;
    padding: 1.5rem 2rem;
}

#card-zdravko {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(59,130,246,0.1) 100%);
    border-color: var(--blue);
    box-shadow: var(--shadow), 0 0 0 1px rgba(59,130,246,0.2);
}

.score-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.2s;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.sparkline {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    border-radius: var(--radius);
}

.score-info-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0;
    transition: opacity 0.2s, color 0.2s;
}
.score-card:hover .score-info-btn { opacity: 1; }
.score-info-btn:hover { color: var(--text-primary); }

.score-tooltip {
    display: none;
    position: fixed;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    max-width: 420px;
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    font-size: 0.82rem;
    line-height: 1.6;
    color: var(--text-primary);
    overflow: hidden;
}
.score-tooltip.visible { display: block; }
.score-tooltip h4 {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--blue);
}
.score-tooltip table { width: 100%; border-collapse: collapse; }
.score-tooltip td { padding: 0.15rem 0; }
.score-tooltip td:first-child { color: var(--text-secondary); padding-right: 0.75rem; }
.score-tooltip td:nth-child(2) { text-align: right; font-weight: 600; padding-right: 0.75rem; }
.score-tooltip td:nth-child(3) { text-align: right; font-weight: 600; white-space: nowrap; }
.score-tooltip .tt-note {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.score-card:hover { transform: translateY(-2px); }

.score-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.score-value {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
}

.score-max {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.score-takeaways {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-content: center;
    gap: 0.3rem;
    margin-top: auto;
    margin-bottom: auto;
    padding-top: 0.5rem;
    width: 100%;
    flex: 1;
}
.takeaway {
    font-size: 0.65rem;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    white-space: nowrap;
}
.ta-good { color: var(--green); background: rgba(34,197,94,0.12); }
.ta-warn { color: var(--yellow); background: rgba(234,179,8,0.12); }
.ta-bad { color: var(--red); background: rgba(239,68,68,0.12); }
.ta-neutral { color: var(--text-secondary); background: rgba(255,255,255,0.06); }

/* Score colors */
.score-green .score-value { color: var(--green); }
.score-yellow .score-value { color: var(--yellow); }
.score-orange .score-value { color: var(--orange); }
.score-red .score-value { color: var(--red); }

/* Score trend */
.score-trend {
    margin-top: 0.35rem;
    font-size: 0.7rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.trend-arrow { font-size: 0.85rem; }
.trend-delta { font-family: monospace; }
.trend-prev { color: var(--text-muted); font-weight: 400; }

.trend-up { color: var(--green); }
.trend-down { color: var(--red); }
.trend-stable { color: var(--text-muted); }

/* Period Selector */
.period-selector {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 2rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.period-buttons {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 0.25rem;
}

.period-btn {
    padding: 0.4rem 1rem;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.period-btn.active {
    background: var(--blue);
    color: white;
}

.period-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* Grouping Selector */
.grouping-buttons {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 0.25rem;
}

.grouping-btn {
    padding: 0.4rem 0.875rem;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.2s;
}

.grouping-btn.active {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.grouping-btn:hover:not(.active) {
    color: var(--text-primary);
}

.date-range {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.date-range input {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.35rem 0.5rem;
    color: var(--text-primary);
    font-size: 0.8rem;
}

/* Alerts */
.alerts-section {
    padding: 0 2rem;
}

.alert {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.alert-warning {
    background: rgba(234, 179, 8, 0.1);
    border: 1px solid var(--yellow);
    color: var(--yellow);
}

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

/* Chart Sections */
.chart-section {
    margin: 1.5rem 2rem;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.chart-section h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.collapsible-header {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.collapsible-header:hover {
    color: var(--text-primary);
}

.collapsible-header:hover .collapsible-hint {
    color: var(--text-secondary);
}

.collapsible-hint {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: color 0.2s;
}

.collapse-icon {
    font-size: 0.65rem;
    transition: transform 0.2s;
}

.collapsible-header:not(.collapsed) .collapse-icon {
    transform: rotate(180deg);
}


.collapsible-body {
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.collapsible-body.collapsed {
    display: none;
}

.chart-container {
    position: relative;
    height: 300px;
}

.stats-row {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.stat-item {
    font-size: 0.85rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.stat-label { color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.03em; }
.stat-value { font-weight: 600; color: var(--text-primary); font-size: 0.95rem; }
.stat-good .stat-value { color: var(--green); }
.stat-warning .stat-value { color: var(--yellow); }
.stat-alert .stat-value { color: var(--red); }

/* AI Section */
.ai-grade {
    display: inline-block;
    font-size: 2rem;
    font-weight: 800;
    width: 60px;
    height: 60px;
    line-height: 60px;
    text-align: center;
    border-radius: 50%;
    margin-right: 1rem;
}

.ai-grade-A { background: var(--green); color: white; }
.ai-grade-B { background: #84cc16; color: white; }
.ai-grade-C { background: var(--yellow); color: #1e293b; }
.ai-grade-D { background: var(--orange); color: white; }
.ai-grade-F { background: var(--red); color: white; }

.ai-summary {
    font-size: 1rem;
    line-height: 1.7;
    align-self: center;
}

.ai-card {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-left: 3px solid var(--border);
}

.ai-card.status-good { border-left-color: var(--green); }
.ai-card.status-warning { border-left-color: var(--yellow); }
.ai-card.status-alert { border-left-color: var(--red); }

.ai-card h3 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.ai-card ul {
    list-style: none;
    padding: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.ai-card li { padding: 0.15rem 0; }
.ai-card li::before { content: "• "; color: var(--text-muted); }

.ai-priority {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

.ai-priority.top {
    background: rgba(234, 179, 8, 0.1);
    border: 1px solid var(--yellow);
}

.ai-priority.positive {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--green);
    margin-bottom: 1rem;
}

.ai-when {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}
.ai-when.ai-stale {
    color: var(--danger, #e53e3e);
}
.ai-disclaimer {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}
.ai-meta {
    margin-top: 0.75rem;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Data Table */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

th, td {
    padding: 0.6rem 0.75rem;
    text-align: right;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

th {
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    cursor: pointer;
}

th:first-child, td:first-child { text-align: left; }

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

.no-data {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
}

/* Correlations */
.correlation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.75rem;
}

.correlation-card {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border);
}

.corr-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.corr-name { font-weight: 600; font-size: 0.9rem; }
.corr-value { font-weight: 700; font-size: 1rem; font-family: monospace; }

.corr-bar-bg {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    margin-bottom: 0.4rem;
    overflow: hidden;
}

.corr-bar {
    height: 100%;
    border-radius: 3px;
    transition: width 0.5s ease;
}

.corr-detail {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Highlights & Streaks */
.highlights-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(4, 1fr);
    gap: 0.75rem;
}

@media (max-width: 1200px) {
    .highlights-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
    .highlights-grid .streak-card { grid-column: 1 / -1; }
}

.highlight-card {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border);
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.streak-card {
    border-color: var(--orange);
    background: rgba(249, 115, 22, 0.05);
}

.hl-icon { font-size: 1.5rem; flex-shrink: 0; }
.hl-content { flex: 1; min-width: 0; }
.hl-title { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem; }
.hl-main { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); }
.hl-sub { font-size: 0.8rem; color: var(--text-secondary); margin-top: 0.15rem; overflow-wrap: break-word; word-break: break-word; }
.hl-best { color: var(--green); font-size: 0.85rem; }
.hl-worst { color: var(--red); font-size: 0.85rem; }
.hl-date { color: var(--text-muted); font-size: 0.8rem; }

/* Footer */
footer {
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 2rem;
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group small {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.form-group a {
    color: var(--blue);
    text-decoration: none;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Google Drive Sync panel */
.modal-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}

.modal-section-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
}

.coverage-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

.coverage-row:last-child {
    border-bottom: none;
}

.coverage-row span {
    color: var(--text-secondary);
}

.coverage-row strong {
    color: var(--text-primary);
}

.gdrive-status-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.gdrive-status-badge.connected {
    background: rgba(34, 197, 94, 0.15);
    color: var(--green);
}

.gdrive-connected-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.gdrive-folder-name {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

.gdrive-sync-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.gdrive-sync-meta-sep {
    margin: 0 0.4rem;
}

.gdrive-last-result {
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 0.82rem;
    margin-bottom: 0.75rem;
}

.gdrive-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--red);
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.25);
}

.gdrive-sync-result {
    margin-top: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.gdrive-sync-ok {
    background: rgba(34, 197, 94, 0.1);
    color: var(--green);
}

.gdrive-sync-info {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.gdrive-sync-warning {
    background: rgba(234, 179, 8, 0.1);
    color: #eab308;
}

.gdrive-sync-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--red);
}

.gdrive-error-note {
    background: rgba(239, 68, 68, 0.1);
    color: var(--red);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    margin-bottom: 0.75rem;
}

.gdrive-setup-instructions {
    margin-bottom: 1rem;
}

.gdrive-instructions-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.gdrive-steps {
    font-size: 0.82rem;
    color: var(--text-muted);
    padding-left: 1.25rem;
    line-height: 1.7;
}

.gdrive-steps a {
    color: var(--blue);
    text-decoration: none;
}

.gdrive-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.gdrive-form-row {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.gdrive-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.gdrive-text-input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
    box-sizing: border-box;
}

.gdrive-text-input:focus {
    outline: none;
    border-color: var(--blue);
}

.gdrive-file-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.gdrive-file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.gdrive-file-label {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.82rem;
    cursor: pointer;
    white-space: nowrap;
}

.gdrive-file-label:hover {
    background: #475569;
}

.gdrive-file-name {
    font-size: 0.82rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 200px;
}

.gdrive-save-btn {
    align-self: flex-start;
}

/* Utilities */
.hidden { display: none !important; }

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    header { padding: 0.75rem 1rem; }
    header h1 { font-size: 1.4rem; }
    .score-cards { padding: 1rem; grid-template-columns: repeat(2, 1fr); }
    .chart-section { margin: 0.75rem 1rem; }
    .period-selector { padding: 0.5rem 1rem; }
    .chart-container { height: 220px; }
    .stats-row { gap: 1rem; }
}

@media (max-width: 480px) {
    .score-cards { grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
    .score-value { font-size: 2rem; }
    .header-right .btn:not(.btn-icon) { padding: 0.4rem 0.6rem; font-size: 0.75rem; }
}