/* ============================================================
   Phoenix Code — Download Stats Dashboard
   Zero-build design system (brand-aligned, light + dark)
   ============================================================ */

:root {
    /* Phoenix Code brand (from phoenix-logo.svg) */
    --brand-red: #F90000;
    --brand-orange: #FF9900;
    --brand-amber: #FE8515;
    --brand-amber-2: #FE9615;
    --brand-amber-3: #FAAA47;
    --brand-gradient: linear-gradient(135deg, #FF9900 0%, #F90000 100%);

    /* Platform accent colors (kept conventional for instant recognition) */
    --c-windows: #3B82F6;
    --c-mac: #8A8F98;
    --c-linux: #FE8515;
    --c-silicon: #16A34A;
    --c-intel: #0EA5E9;
    --c-installer: #FE8515;
    --c-updater: #7C3AED;
    --c-primary: #F90000;
    --c-ma: #111827;

    /* Surfaces & text */
    --bg: #f5f6f8;
    --surface: #ffffff;
    --surface-2: #fbfbfc;
    --text: #1b2030;
    --muted: #69707d;
    --border: #e7e9ee;
    --grid: rgba(20, 24, 35, 0.06);
    --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 4px 16px rgba(16, 24, 40, 0.06);
    --radius: 14px;
    --radius-sm: 9px;
    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
    --bg: #0e1117;
    --surface: #161b22;
    --surface-2: #1b2129;
    --text: #e8ebf2;
    --muted: #9aa3b2;
    --border: #272d38;
    --grid: rgba(255, 255, 255, 0.07);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 20px rgba(0, 0, 0, 0.35);
    --c-ma: #f3f4f6;
    --c-mac: #aab0ba;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: var(--brand-amber); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 24px;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    backdrop-filter: saturate(1.4) blur(10px);
    border-bottom: 1px solid var(--border);
}
.site-header .logo { width: 30px; height: 30px; }
.site-header h1 {
    font-size: 1.06rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.01em;
}
.site-header h1 .accent {
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.header-spacer { flex: 1; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    font-size: 0.95rem;
    transition: background 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}
.icon-btn:hover { background: var(--surface-2); border-color: var(--brand-amber); transform: translateY(-1px); }

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 38px;
    padding: 0 16px;
    border-radius: 10px;
    background: var(--brand-gradient);
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    box-shadow: 0 2px 8px color-mix(in srgb, var(--brand-red) 30%, transparent);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    white-space: nowrap;
}
.btn-download:hover { transform: translateY(-1px); text-decoration: none; color: #fff; box-shadow: 0 4px 14px color-mix(in srgb, var(--brand-red) 42%, transparent); }

@media (max-width: 560px) {
    .btn-download .btn-text { display: none; }
    .btn-download { padding: 0 12px; }
}

/* ---------- Layout ---------- */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 28px 24px 80px;
}
.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.18rem;
    font-weight: 700;
    margin: 34px 0 16px;
    letter-spacing: -0.01em;
}
.section-title .ic { color: var(--brand-amber); }
.section-sub { color: var(--muted); font-weight: 400; font-size: 0.85rem; margin-left: auto; }

/* ---------- KPI cards ---------- */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(195px, 1fr));
    gap: 16px;
}
.kpi {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}
.kpi::before {
    content: "";
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--brand-gradient);
    opacity: 0.9;
}
.kpi-head { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.kpi-head .ic {
    width: 26px; height: 26px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 8px;
    background: color-mix(in srgb, var(--brand-amber) 16%, transparent);
    color: var(--brand-amber);
    font-size: 0.8rem;
}
.kpi-value { font-size: 1.85rem; font-weight: 800; margin: 10px 0 2px; letter-spacing: -0.02em; }
.kpi-sub { font-size: 0.8rem; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.delta { font-weight: 700; display: inline-flex; align-items: center; gap: 4px; }
.delta.up { color: #16a34a; }
.delta.down { color: #dc2626; }
.delta.flat { color: var(--muted); }

/* ---------- Chart cards ---------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}
.card-head {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 6px;
}
.card-head h3 { font-size: 1rem; font-weight: 700; margin: 0; display: flex; align-items: center; gap: 8px; }
.card-head h3 .ic { color: var(--brand-amber); }
.card-head .spacer { flex: 1; }
.card-note {
    font-size: 0.78rem;
    color: var(--muted);
    margin: 2px 0 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.card-note .fa-circle-info { color: var(--brand-amber); }
.chart-wrap { position: relative; height: 340px; }
.chart-wrap.tall { height: 420px; }

.grid-2 { display: grid; grid-template-columns: 1.6fr 1fr; gap: 20px; align-items: stretch; }
.grid-2 .card { margin-bottom: 0; }

/* ---------- Controls ---------- */
.controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}
.control { display: flex; flex-direction: column; gap: 6px; }
.control > label { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.control-row { display: flex; align-items: center; gap: 8px; }

select, input[type="number"], input[type="text"].num {
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    font-size: 0.88rem;
    outline: none;
}
select:focus, input:focus { border-color: var(--brand-amber); }
input.num { width: 56px; text-align: center; }

/* Segmented control (time windows / day-aggregate) */
.segmented { display: inline-flex; flex-wrap: wrap; gap: 4px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 11px; padding: 4px; }
.segmented label { cursor: pointer; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label span {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--muted);
    transition: all 0.15s ease;
    white-space: nowrap;
}
.segmented label:hover span { color: var(--text); }
.segmented input:checked + span {
    background: var(--brand-gradient);
    color: #fff;
    box-shadow: 0 2px 6px color-mix(in srgb, var(--brand-red) 35%, transparent);
}

/* ---------- Advanced disclosure ---------- */
.advanced-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    width: 100%;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    box-shadow: var(--shadow);
    margin-top: 34px;
    transition: border-color 0.15s ease;
}
.advanced-toggle:hover { border-color: var(--brand-amber); }
.advanced-toggle .chev { margin-left: auto; color: var(--muted); transition: transform 0.2s ease; }
.advanced-toggle[aria-expanded="true"] .chev { transform: rotate(180deg); }
.advanced-toggle .ic { color: var(--brand-amber); }
#advancedPanel { margin-top: 18px; }
#advancedPanel[hidden] { display: none; }

/* ---------- States ---------- */
.state {
    text-align: center;
    padding: 60px 20px;
    color: var(--muted);
}
.state .ic { font-size: 2.2rem; color: var(--brand-amber); margin-bottom: 12px; }
.state h3 { margin: 0 0 6px; color: var(--text); }
.spinner {
    width: 38px; height: 38px;
    border: 3px solid var(--border);
    border-top-color: var(--brand-amber);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.badge-warn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.72rem;
    font-weight: 600;
    color: #b45309;
    background: rgba(245, 158, 11, 0.14);
    border-radius: 999px;
    padding: 3px 9px;
}
[data-theme="dark"] .badge-warn { color: #fbbf24; }

/* ---------- Footer ---------- */
.site-footer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.82rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 18px;
}
.site-footer .ic { color: var(--brand-amber); }
.site-footer .spacer { flex: 1; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
    .grid-2 { grid-template-columns: 1fr; }
    .grid-2 .card { margin-bottom: 20px; }
    main { padding: 20px 14px 60px; }
    .chart-wrap { height: 300px; }
}
@media (max-width: 520px) {
    .kpi-value { font-size: 1.5rem; }
    .site-header h1 { font-size: 0.95rem; }
}