/* ─── Reset & base ─────────────────────────────────────────────────────────── */

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

/* Reinforce the HTML `hidden` attribute — some browsers' user-agent stylesheets
   omit `!important`, allowing author rules like `.btn { display: inline-flex }`
   to win the cascade and show elements that should be hidden. */
[hidden] {
  display: none !important;
}

:root {
  --color-bg:        #0f1117;
  --color-surface:   #1c1e26;
  --color-surface-2: #252832;
  --color-border:    #2e3142;
  --color-accent:    #4f8ef7;
  --color-accent-hover: #3a7de8;
  --color-success:   #34c97a;
  --color-success-hover: #28b56b;
  --color-error:     #f25c5c;
  --color-text:      #e2e4ef;
  --color-muted:     #7c8099;
  --radius:          12px;
  --radius-sm:       8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

code {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  background: var(--color-surface-2);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--color-accent);
}

/* ─── Layout ───────────────────────────────────────────────────────────────── */

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ─── Header ───────────────────────────────────────────────────────────────── */

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #fff;
}

.subtitle {
  margin-top: 0.5rem;
  color: var(--color-muted);
}

/* ─── Drop zone ────────────────────────────────────────────────────────────── */

.upload-section {
  margin-bottom: 1.5rem;
}

.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone--active {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 6%, var(--color-surface));
}

.drop-zone--loaded {
  border-style: solid;
  border-color: var(--color-accent);
}

.drop-zone__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 3rem 2rem;
  text-align: center;
  pointer-events: none;
}

.drop-zone__content svg {
  color: var(--color-muted);
}

.drop-zone--loaded .drop-zone__content svg {
  color: var(--color-accent);
}

.drop-zone__content p {
  color: var(--color-muted);
}

.or {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ─── Buttons ──────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.55rem 1.2rem;
  text-decoration: none;
  transition: background 0.15s, opacity 0.15s;
  pointer-events: auto;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
}

.btn--success {
  background: var(--color-success);
  color: #fff;
}
.btn--success:hover:not(:disabled) {
  background: var(--color-success-hover);
}

.btn--ghost {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover:not(:disabled) {
  background: var(--color-border);
}

.btn--large {
  font-size: 1rem;
  padding: 0.75rem 1.75rem;
}

/* ─── Options section ──────────────────────────────────────────────────────── */

.options-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.options-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: #fff;
}

.option-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.option-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.option-group select,
.option-group input[type="datetime-local"] {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.6rem 0.8rem;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 0.15s;
}

.option-group select:focus,
.option-group input[type="datetime-local"]:focus {
  outline: none;
  border-color: var(--color-accent);
}

.hint {
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* ─── Result section ───────────────────────────────────────────────────────── */

.result-section {
  margin-bottom: 1.5rem;
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.result-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-success);
  margin-bottom: 1.25rem;
}

/* Stats grid */
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.stat {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
}

.stat dt {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.stat dd {
  font-size: 0.95rem;
  color: var(--color-text);
  word-break: break-word;
}

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

/* ─── Error section ────────────────────────────────────────────────────────── */

.error-section {
  margin-bottom: 1.5rem;
}

.error-card {
  background: color-mix(in srgb, var(--color-error) 10%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-error) 40%, var(--color-border));
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.error-card p {
  color: var(--color-error);
  font-weight: 500;
}

/* ─── Power chart ──────────────────────────────────────────────────────────── */

.chart-wrap {
  margin-bottom: 1.5rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.power-chart {
  display: block;
  width: 100%;
  height: auto;
}

/* Grid lines */
.chart__grid line {
  stroke: var(--color-border);
  stroke-width: 1;
}

/* Area fill */
.chart__area {
  /* fill set via SVG gradient */
}

/* Power line */
.chart__line {
  fill: none;
  stroke: #4f8ef7;
  stroke-width: 1.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* Average power dashed line */
.chart__avg-line {
  stroke: #f5a623;
  stroke-width: 1.2;
  stroke-dasharray: 5 4;
}

/* Axes */
.chart__axis {
  stroke: var(--color-border);
  stroke-width: 1;
}

/* Y/X tick labels */
.chart__y-labels text,
.chart__x-labels text {
  fill: var(--color-muted);
  font-family: var(--font);
  font-size: 10px;
  text-anchor: end;
}

.chart__x-labels text {
  text-anchor: middle;
}

/* Avg watt label to the right of the avg line */
.chart__avg-label {
  fill: #f5a623;
  font-family: var(--font);
  font-size: 10px;
  text-anchor: start;
}

/* Axis titles */
.chart__axis-title {
  fill: var(--color-muted);
  font-family: var(--font);
  font-size: 10px;
  text-anchor: middle;
}

/* Speed line */
.chart__speed-line {
  fill: none;
  stroke: #f97316;
  stroke-width: 1.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* Right Y axis labels (speed) — text-anchor: start so they read left-to-right */
.chart__y-labels--right text {
  text-anchor: start;
  fill: #f97316;
}

/* Legend labels inside the chart */
.chart__legend-label {
  fill: var(--color-muted);
  font-family: var(--font);
  font-size: 10px;
}

/* ─── Platform upload buttons ─────────────────────────────────────────────── */

.btn--strava {
  background: #FC4C02;
  color: #fff;
}
.btn--strava:hover:not(:disabled) {
  background: #e04300;
}

.btn--trainingpeaks {
  background: #4A90E2;
  color: #fff;
}
.btn--trainingpeaks:hover:not(:disabled) {
  background: #3a7fd0;
}

/* ─── Upload status ────────────────────────────────────────────────────────── */

.upload-status {
  margin-top: 0.75rem;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
}

.upload-status[data-state="pending"] {
  background: color-mix(in srgb, var(--color-accent) 12%, var(--color-surface-2));
  color: var(--color-accent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 30%, var(--color-border));
}

.upload-status[data-state="success"] {
  background: color-mix(in srgb, var(--color-success) 12%, var(--color-surface-2));
  color: var(--color-success);
  border: 1px solid color-mix(in srgb, var(--color-success) 30%, var(--color-border));
}

.upload-status[data-state="error"] {
  background: color-mix(in srgb, var(--color-error) 10%, var(--color-surface-2));
  color: var(--color-error);
  border: 1px solid color-mix(in srgb, var(--color-error) 40%, var(--color-border));
}

.upload-status a {
  color: inherit;
  text-decoration: underline;
}

/* ─── Footer ───────────────────────────────────────────────────────────────── */

footer {
  margin-top: auto;
  padding-top: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.github-link {
  display: inline-block;
  margin-top: 0.75rem;
  color: var(--color-muted);
  transition: color 0.15s ease;
}

.github-link:hover {
  color: var(--text-primary);
}

/* ─── Responsive ───────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
  header h1 {
    font-size: 1.6rem;
  }

  .stats {
    grid-template-columns: 1fr;
  }

  .drop-zone__content {
    padding: 2rem 1.25rem;
  }
}

/* ─── iOS install hint ──────────────────────────────────────────────────────── */

.install-hint {
  margin-top: 1.25rem;
  padding: 0.75rem 1rem;
  background: rgba(79, 142, 247, 0.1);
  border: 1px solid rgba(79, 142, 247, 0.3);
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.install-hint strong {
  color: var(--text-primary);
}

.install-hint__dismiss {
  margin-left: 0.5rem;
  padding: 0.1rem 0.5rem;
  background: none;
  border: 1px solid currentColor;
  border-radius: 4px;
  color: inherit;
  font-size: inherit;
  cursor: pointer;
  white-space: nowrap;
}

.install-hint__dismiss:hover {
  color: var(--text-primary);
}