:root {
  --bg: #ffffff;
  --fg: #000000;
  --gray-dark: #444444;
  --gray-mid: #cccccc;
  --gray-light: #e6e6e6;
  --gray-lighter: #f7f7f7;
  --btn-bg: #111111;
  --btn-bg-hover: #2b2b2b;
  --btn-fg: #ffffff;
  --radius: 6px;
  --max-width: 760px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--gray-light);
  padding: 22px 0;
}

.header-inner {
  display: flex;
  align-items: baseline;
}

.page-title {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--fg);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  margin: 32px 0 20px;
  border-bottom: 1px solid var(--gray-light);
  overflow-x: auto;
}

.tab {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: inherit;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--gray-dark);
  padding: 10px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab:hover { color: var(--fg); }

.tab.is-active {
  color: var(--fg);
  border-bottom-color: var(--fg);
}

/* Panels — kept in the DOM and never display:none'd, so a running timer
   interval or a playing YouTube embed isn't reset/paused when its tab
   isn't the active one. Inactive panels are absolutely positioned out of
   flow (so they don't add blank space below the active panel) and hidden
   visually/interactively via opacity + pointer-events instead. */
.panel-stack {
  position: relative;
}

.panel {
  opacity: 1;
  pointer-events: auto;
}

.panel:not(.is-active) {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  pointer-events: none;
}

.card {
  border: 1px solid var(--gray-light);
  border-radius: 10px;
  padding: 32px;
  margin-bottom: 40px;
  background: var(--bg);
}

.card-title {
  margin: 0 0 4px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.card-sub {
  margin: 0 0 24px;
  color: var(--gray-dark);
  font-size: 2.4rem;
}

/* Buttons */
.btn {
  appearance: none;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 10px 20px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--btn-bg);
  color: var(--btn-fg);
}

.btn-primary:hover { background: var(--btn-bg-hover); }

.btn-ghost {
  background: var(--bg);
  color: var(--fg);
  border-color: var(--gray-mid);
}

.btn-ghost:hover { background: var(--gray-lighter); }

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

#panel-timer .card {
  text-align: center;
}

#panel-timer .btn-row {
  justify-content: center;
}

#panel-timer .timer-inputs {
  margin: 0 auto;
}

/* Form fields */
.timer-inputs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.time-input {
  font-family: inherit;
  font-size: 3.4rem;
  font-weight: 700;
  color: var(--fg);
  border: 1px solid var(--gray-mid);
  border-radius: var(--radius);
  padding: 8px 10px;
  width: 120px;
  text-align: center;
}

.time-input:focus {
  outline: none;
  border-color: var(--fg);
}

.time-label {
  font-size: 1.5rem;
  color: var(--gray-dark);
  font-weight: 600;
}

.field-row {
  display: flex;
  gap: 10px;
  margin-bottom: 4px;
}

.field-row input[type="text"],
.field-row input[type="password"] {
  flex: 1;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--gray-mid);
  border-radius: var(--radius);
  padding: 10px 12px;
  color: var(--fg);
  background: var(--bg);
}

.field-row input:focus {
  outline: none;
  border-color: var(--fg);
}

.clock-wrap {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 0 auto 28px;
}

.clock-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.clock-track {
  fill: none;
  stroke: var(--gray-light);
  stroke-width: 8;
}

.clock-progress {
  fill: none;
  stroke: var(--gray-mid);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s linear, stroke 0.2s ease;
}

.clock-wrap.is-running .clock-progress {
  stroke: var(--fg);
}

.timer-display {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--gray-mid);
  transition: color 0.2s ease;
}

.clock-wrap.is-running .timer-display {
  color: var(--fg);
}

.btn-icon {
  width: 100px;
  height: 52px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon .icon {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.btn-icon .icon.is-hidden {
  display: none;
}

.hint {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--gray-dark);
  min-height: 1.2em;
}

.hint.is-error { color: #b00020; }

.youtube-player {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--gray-lighter);
  border-radius: var(--radius);
  margin: 20px 0;
  overflow: hidden;
}

.settings-details {
  margin-bottom: 20px;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: 10px 14px;
}

.settings-details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
}

.settings-details .field-row {
  margin-top: 12px;
}

.icebreaker-output {
  margin-top: 20px;
  min-height: 60px;
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--gray-light);
  padding: 24px 0 48px;
  color: var(--gray-dark);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--gray-dark);
}

@media (max-width: 520px) {
  .clock-wrap { width: 170px; height: 170px; }
  .timer-display { font-size: 1.9rem; }
  .timer-inputs { gap: 14px; }
  .card { padding: 22px; }
}