:root {
    --tg-bg: var(--tg-theme-bg-color, #ffffff);
    --tg-text: var(--tg-theme-text-color, #000000);
    --tg-hint: var(--tg-theme-hint-color, #999999);
    --tg-link: var(--tg-theme-link-color, #2481cc);
    --tg-button: var(--tg-theme-button-color, #2481cc);
    --tg-button-text: var(--tg-theme-button-text-color, #ffffff);
    --tg-secondary-bg: var(--tg-theme-secondary-bg-color, #f0f0f0);
    --color-success: #2e7d32;
    --color-danger: #c62828;
    --color-warning: #f57f17;
    --color-danger-dark: #b71c1c;
    --badge-active-bg: #e8f5e9;
    --badge-inactive-bg: #fce4ec;
    --heatmap-high: rgba(46, 125, 50, 0.5);
    --heatmap-mid: rgba(245, 127, 23, 0.5);
    --heatmap-low: rgba(255, 152, 0, 0.5);
    --heatmap-cold: rgba(198, 40, 40, 0.25);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { overscroll-behavior: none; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--tg-bg); color: var(--tg-text);
    padding: 16px; -webkit-font-smoothing: antialiased;
    padding-top: env(safe-area-inset-top, 16px);
    padding-bottom: env(safe-area-inset-bottom, 16px);
}
#app { max-width: 400px; margin: 0 auto; }
h1 { font-size: 20px; font-weight: 600; margin-bottom: 20px; text-align: center; }
h3 { margin: 0 0 12px; }
#loader { display: flex; justify-content: center; align-items: center; height: 60vh; }
.spinner {
    width: 36px; height: 36px;
    border: 3px solid var(--tg-secondary-bg); border-top-color: var(--tg-button);
    border-radius: 50%; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Tabs */
.tabs { display: flex; margin-bottom: 20px; border-radius: 12px; overflow-x: auto; -webkit-overflow-scrolling: touch; background: var(--tg-secondary-bg); scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tab {
    flex: 0 0 auto; padding: 12px 16px; text-align: center; font-size: 15px; font-weight: 600; white-space: nowrap;
    cursor: pointer; transition: all 0.15s ease; -webkit-tap-highlight-color: transparent;
    user-select: none; color: var(--tg-hint);
}
.tab.active { background: var(--tg-button); color: var(--tg-button-text); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Period chips */
.period-chips { display: flex; gap: 8px; justify-content: center; margin-bottom: 16px; }
.chip {
    padding: 6px 14px; border-radius: 16px; font-size: 13px; font-weight: 600;
    cursor: pointer; background: var(--tg-secondary-bg); color: var(--tg-hint);
    transition: all 0.15s ease; -webkit-tap-highlight-color: transparent; user-select: none;
}
.chip.active { background: var(--tg-button); color: var(--tg-button-text); }

/* User stats cards */
.user-cards { display: flex; gap: 8px; margin-bottom: 20px; }
.user-card {
    flex: 1; text-align: center; padding: 12px 8px;
    background: var(--tg-secondary-bg); border-radius: 12px;
}
.user-card .number { font-size: 24px; font-weight: 700; color: var(--tg-button); }
.user-card .label { font-size: 11px; color: var(--tg-hint); margin-top: 2px; }

/* Stats */
.stats-total { text-align: center; margin-bottom: 20px; }
.stats-total .number { font-size: 48px; font-weight: 700; color: var(--tg-button); }
.stats-total .label { font-size: 14px; color: var(--tg-hint); margin-top: 4px; }
.stats-table { width: 100%; border-collapse: collapse; }
.stats-table td { padding: 10px 0; border-bottom: 1px solid var(--tg-secondary-bg); font-size: 15px; }
.stats-table td:last-child { text-align: right; font-weight: 600; }

/* Section title */
.section-title { font-size: 14px; font-weight: 600; margin-bottom: 10px; color: var(--tg-hint); }
.section-title-mt { margin-top: 16px; }

/* Empty state */
.empty-state { text-align: center; color: var(--tg-hint); padding: 40px 0; font-size: 15px; }

/* Channels */
.channel-card {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 0; border-bottom: 1px solid var(--tg-secondary-bg);
}
.channel-info { flex: 1; }
.channel-name { font-size: 15px; font-weight: 600; }
.channel-meta { font-size: 13px; color: var(--tg-hint); margin-top: 2px; }
.channel-messages { font-size: 13px; color: var(--tg-hint); margin-top: 2px; }

/* Badges */
.badge { display: inline-block; padding: 3px 8px; border-radius: 6px; font-size: 12px; font-weight: 600; }
.badge-active { background: var(--badge-active-bg); color: var(--color-success); }
.badge-inactive { background: var(--badge-inactive-bg); color: var(--color-danger); }
.badge-mode { background: var(--tg-secondary-bg); color: var(--tg-hint); }

/* Feedback */
.feedback-cards { display: flex; gap: 12px; margin-bottom: 20px; }
.feedback-card {
    flex: 1; text-align: center; padding: 16px 8px;
    background: var(--tg-secondary-bg); border-radius: 12px;
}
.feedback-card .emoji { font-size: 28px; }
.feedback-card .number { font-size: 32px; font-weight: 700; margin-top: 4px; }
.feedback-card.positive .number { color: var(--color-success); }
.feedback-card.negative .number { color: var(--color-danger); }
.feedback-card.neutral .number { color: var(--tg-hint); }
.feedback-card .label { font-size: 12px; color: var(--tg-hint); margin-top: 2px; }

/* Loading & retry */
.tab-loader { text-align: center; padding: 12px 0; }
.spinner-small {
    display: inline-block; width: 20px; height: 20px;
    border: 2px solid var(--tg-secondary-bg); border-top-color: var(--tg-button);
    border-radius: 50%; animation: spin 0.7s linear infinite;
}
.loader-center { text-align: center; padding: 20px; }
.retry-container { text-align: center; padding: 40px 20px; }
.retry-btn {
    background: var(--tg-button, #3390ec); color: var(--tg-button-text, #fff);
    border: none; padding: 10px 24px; border-radius: 8px; font-size: 15px; cursor: pointer;
}
.retry-msg { color: var(--tg-hint, #999); margin-bottom: 16px; font-size: 14px; }

/* Bar charts */
.bar-bg { background: var(--tg-secondary-bg); border-radius: 4px; height: 8px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 4px; transition: width 0.3s; }
.bar-row { display: flex; align-items: center; margin-bottom: 4px; font-size: 12px; }
.bar-label { flex-shrink: 0; color: var(--tg-hint); }
.bar-label-w40 { width: 40px; }
.bar-label-w70 { width: 70px; }
.bar-label-today { font-weight: 600; color: var(--tg-text); }
.bar-track { flex: 1; background: var(--tg-secondary-bg); border-radius: 3px; height: 16px; margin: 0 8px; overflow: hidden; }
.bar-track-fill { height: 100%; border-radius: 3px; }
.bar-value { flex-shrink: 0; text-align: right; font-weight: 600; }
.bar-value-w20 { width: 20px; }
.bar-value-w36 { width: 36px; }
.bar-value-w50 { width: 50px; font-size: 11px; font-weight: normal; }

/* Funnel */
.funnel-step { margin-bottom: 8px; }
.funnel-header { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 2px; }
.funnel-pct { color: var(--tg-hint); }

/* Retention cards */
.retention-cards { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.retention-card {
    flex: 1; min-width: 90px; background: var(--tg-secondary-bg);
    border-radius: 8px; padding: 12px; text-align: center;
}
.retention-label { font-size: 12px; color: var(--tg-hint); }
.retention-value { font-size: 24px; font-weight: 700; }
.retention-sub { font-size: 11px; color: var(--tg-hint); }

/* Perf grid */
.perf-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0; }
.perf-card { padding: 12px 8px; }
.perf-card .emoji { font-size: 22px; }
.perf-card .number { font-size: 24px; }
.perf-card .label { font-size: 12px; }

/* Users tab */
.user-row { padding: 10px 0; border-bottom: 1px solid var(--tg-secondary-bg); }
.user-row-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.user-row-name { font-weight: 600; font-size: 14px; }
.user-row-date { font-size: 12px; color: var(--tg-hint); }
.user-row-stats { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--tg-hint); }

/* Pagination */
.pagination { display: flex; justify-content: center; align-items: center; gap: 12px; padding: 12px 0; font-size: 13px; }
.btn-outline {
    padding: 6px 14px; border: 1px solid var(--tg-button); border-radius: 6px;
    background: transparent; color: var(--tg-button); cursor: pointer; font-size: 13px;
}

/* Error text */
.error-text { color: var(--color-danger); font-size: 13px; }
.hint-text { color: var(--tg-hint); font-size: 13px; }
.hint-text-sm { color: var(--tg-hint); font-size: 12px; }
.mb-20 { margin-bottom: 20px; }
.text-bold { font-weight: 600; }
.text-xs { font-size: 11px; }

/* Responsive */
@media (max-width: 360px) {
    .user-cards { flex-direction: column; }
    .feedback-cards { flex-direction: column; }
    .tabs { font-size: 13px; }
    .tab { padding: 10px 8px; font-size: 13px; }
    .period-chips { gap: 4px; }
    .chip { padding: 5px 10px; font-size: 12px; }
}