/* PitPat Treadmill — stylesheet
 * Light-by-default with prefers-color-scheme dark override.
 * All colors live in CSS variables on :root so theme tweaks are one place.
 */

:root {
    --bg: #ffffff;
    --surface: #f6f7f9;
    --surface-2: #ffffff;
    --border: #e6e8ec;
    --border-strong: #d4d7dd;
    --text: #0f1115;
    --text-muted: #6b7280;
    --accent: #2563eb;
    --accent-text: #ffffff;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #b45309;
    --shadow: 0 1px 2px rgba(15, 17, 21, 0.04), 0 1px 1px rgba(15, 17, 21, 0.02);
    --radius: 14px;
    --radius-sm: 10px;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0d10;
        --surface: #14171c;
        --surface-2: #1a1f26;
        --border: #232830;
        --border-strong: #2d333d;
        --text: #e7e9ee;
        --text-muted: #9aa0aa;
        --accent: #60a5fa;
        --accent-text: #0b0d10;
        --success: #4ade80;
        --danger: #f87171;
        --warning: #fbbf24;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
    }
}

* { box-sizing: border-box; }
html, body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter",
                 system-ui, "Helvetica Neue", Arial, sans-serif;
    font-feature-settings: "tnum" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
button { font-family: inherit; }

.app {
    max-width: 560px;
    margin: 0 auto;
    padding: 24px 20px 80px;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}
.app-header h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.tabs {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 3px;
    gap: 2px;
}
.tab {
    border: 0;
    background: transparent;
    color: var(--text-muted);
    padding: 7px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}
.tab.is-active {
    background: var(--surface-2);
    color: var(--text);
    box-shadow: var(--shadow);
}

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

.status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 12px;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
}
.chip::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
}
.chip-connected   { color: var(--success); border-color: color-mix(in oklab, var(--success) 35%, var(--border)); }
.chip-paused      { color: var(--warning); border-color: color-mix(in oklab, var(--warning) 35%, var(--border)); }
.chip-connecting  { color: var(--warning); border-color: color-mix(in oklab, var(--warning) 35%, var(--border)); }
.chip-disconnected{ color: var(--text-muted); }

.btn {
    border: 1px solid var(--border-strong);
    background: var(--surface-2);
    color: var(--text);
    padding: 9px 14px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.12s, transform 0.05s, opacity 0.12s, border-color 0.12s;
}
.btn:hover:not(:disabled) { border-color: var(--text-muted); }
.btn:active:not(:disabled) { transform: scale(0.98); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary { background: var(--accent);  border-color: var(--accent);  color: var(--accent-text); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.05); border-color: var(--accent); }
.btn-go      { background: var(--success); border-color: var(--success); color: white; }
.btn-go:hover:not(:disabled)      { filter: brightness(1.05); border-color: var(--success); }
.btn-stop    { background: var(--danger);  border-color: var(--danger);  color: white; }
.btn-stop:hover:not(:disabled)    { filter: brightness(1.05); border-color: var(--danger); }
.btn-ghost   { background: transparent; border-color: var(--border); }

.hero {
    text-align: center;
    padding: 28px 16px 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
}
.hero-value {
    font-size: 56px;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1;
}
.hero-label {
    color: var(--text-muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
.stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
}
.stat-label {
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.stat-value {
    font-size: 20px;
    font-weight: 600;
    margin-top: 4px;
    letter-spacing: -0.01em;
}

.settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}
.setting {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}
.setting-label {
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.segmented {
    display: inline-flex;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2px;
    gap: 2px;
}
.seg {
    border: 0;
    background: transparent;
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
}
.seg.is-active {
    background: var(--surface-2);
    color: var(--text);
    box-shadow: var(--shadow);
}

.slider-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 16px 16px;
    margin-bottom: 16px;
}
.slider-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
}
.slider-label {
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.slider-value { font-size: 16px; font-weight: 600; }
#sliderUnit { color: var(--text-muted); font-weight: 500; margin-left: 2px; }

input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    height: 28px;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    margin-top: -9px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--surface-2);
    box-shadow: 0 1px 4px rgba(0,0,0,0.18);
    cursor: pointer;
}
input[type="range"]::-moz-range-track {
    height: 6px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
}
input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--surface-2);
    box-shadow: 0 1px 4px rgba(0,0,0,0.18);
    cursor: pointer;
}
input[type="range"]:disabled { opacity: 0.5; cursor: not-allowed; }

.controls {
    display: grid;
    grid-template-columns: auto 1fr 1fr auto;
    gap: 8px;
}
.controls .btn { padding: 12px 14px; font-weight: 600; }

/* ---- History / Calendar ---- */

.history-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 14px;
}
.history-buttons {
    display: flex;
    gap: 8px;
}
.calendar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
}
.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.cal-month { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }
.cal-nav {
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    padding: 0;
}
.cal-nav:hover { border-color: var(--text-muted); }
.cal-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: 6px;
}
.cal-weekdays > div {
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 0;
}
.cal-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}
.cal-day {
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 6px 6px 8px;
    min-height: 64px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: left;
    cursor: pointer;
    color: var(--text);
    font: inherit;
    transition: border-color 0.12s, background 0.12s;
}
.cal-day.is-outside              { opacity: 0.35; cursor: default; }
.cal-day.is-empty:not(.is-outside) { cursor: default; }
.cal-day:not(.is-empty):not(.is-outside):hover { border-color: var(--border-strong); }
.cal-day.is-today .cal-day-num {
    background: var(--accent);
    color: var(--accent-text);
    border-radius: 999px;
    padding: 0 7px;
    min-width: 20px;
    display: inline-flex;
    justify-content: center;
}
.cal-day.is-selected {
    border-color: var(--accent);
    background: color-mix(in oklab, var(--accent) 10%, var(--surface-2));
}
.cal-day-num { font-size: 12px; font-weight: 600; }
.cal-day-totals {
    display: flex;
    flex-direction: column;
    gap: 1px;
    font-size: 11px;
    line-height: 1.2;
}
.cal-day-totals .dist { color: var(--text); font-weight: 600; }
.cal-day-totals .kcal { color: var(--text-muted); }

.day-detail {
    margin-top: 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
}
.day-detail-header {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 10px;
}
.session-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 8px;
    align-items: center;
    padding: 8px 0;
    border-top: 1px solid var(--border);
    font-size: 14px;
}
.session-row:first-of-type { border-top: 0; }
.session-row .label { color: var(--text-muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }
.session-row .v { font-weight: 600; }

.icon-btn {
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text-muted);
    width: 30px;
    height: 30px;
    border-radius: 8px;
    cursor: pointer;
    padding: 0;
    font-size: 14px;
    line-height: 1;
}
.icon-btn:hover { color: var(--danger); border-color: var(--danger); }

/* ---- Overlays / countdown / toast ---- */

.overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.7);
    z-index: 1000;
}
.overlay[hidden] { display: none; }
@media (prefers-color-scheme: dark) {
    .overlay { background: rgba(11,13,16,0.75); }
}
.overlay-dark { background: rgba(11,13,16,0.85); z-index: 1100; }

.spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.countdown-number {
    color: #fff;
    font-size: 6rem;
    font-weight: 700;
}
.countdown-number.is-pulsing {
    animation: countdown-pulse 0.7s ease-out;
}
@keyframes countdown-pulse {
    0%   { transform: scale(1);   opacity: 1; }
    60%  { transform: scale(1);   opacity: 1; }
    100% { transform: scale(1.3); opacity: 0.5; }
}

.toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--bg);
    padding: 10px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    box-shadow: 0 6px 24px rgba(0,0,0,0.25);
    z-index: 1200;
    max-width: 90vw;
}
.toast[hidden] { display: none; }

/* ---- Settings button, chart, presets, modal ---- */

.status-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}
/* Reuse .icon-btn sizing but neutral (not danger) hover for the gear. */
#settingsBtn { font-size: 16px; }
#settingsBtn:hover { color: var(--text); border-color: var(--text-muted); }

.chart-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px 10px;
    margin-bottom: 12px;
}
#sessionChart {
    display: block;
    width: 100%;
    height: 160px;
}
.chart-debug {
    margin-top: 6px;
    font-size: 11px;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}
.chart-debug[hidden] { display: none; }
.chart-axis      { stroke: var(--border); stroke-width: 1; }
.chart-grid      { stroke: var(--border); stroke-width: 1; opacity: 0.5; }
.chart-tick-text { fill: var(--text-muted); font-size: 9px; }
.chart-speed     { stroke: var(--accent); stroke-width: 2; fill: none; }
.chart-steps     { stroke: var(--success); stroke-width: 2; fill: var(--success); }
.chart-incline   { stroke: var(--warning); stroke-width: 1.5; fill: var(--warning); fill-opacity: 0.10; }
polyline.chart-steps { fill: none; }

.preset-row {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    gap: 6px;
    margin-bottom: 16px;
}
.preset-btn {
    border: 1px solid var(--border-strong);
    background: var(--surface-2);
    color: var(--text);
    padding: 8px 0;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.12s, background 0.12s;
}
.preset-btn:hover { border-color: var(--text-muted); }
.preset-btn.is-active { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }

.modal-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    width: min(90vw, 360px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.modal-title { margin: 0 0 4px; font-size: 18px; font-weight: 600; }
.modal-hint  { margin: 0 0 16px; font-size: 12px; color: var(--text-muted); line-height: 1.4; }
.field-label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}
.field-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 14px;
}
.field-input {
    flex: 1;
    min-width: 0;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    color: var(--text);
    border-radius: 8px;
    padding: 9px 12px;
    font-size: 15px;
    font-family: inherit;
}
.field-input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 4px;
}

.tile-checks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px 14px;
    margin-bottom: 16px;
}
.tile-checks label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    cursor: pointer;
}
.tile-checks input { accent-color: var(--accent); width: 16px; height: 16px; }

/* Lifetime totals (History tab) */
.lifetime {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}
.lifetime-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
}
.lifetime-label {
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.lifetime-value {
    font-size: 20px;
    font-weight: 600;
    margin-top: 4px;
    letter-spacing: -0.01em;
}

.stat.is-hidden { display: none; }

@media (max-width: 480px) {
    .app { padding: 16px 14px 80px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .cal-day { min-height: 56px; padding: 4px 4px 6px; }
    .cal-day-totals { font-size: 10px; }
    #sessionChart { height: 140px; }
    .preset-btn { font-size: 12px; padding: 7px 0; }
    .lifetime { gap: 6px; }
    .lifetime-item { padding: 10px 8px; }
    .lifetime-value { font-size: 16px; }
}