:root {
  color-scheme: dark;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: #07090f;
  color: #f5f7ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #1a1d2b, #07090f 60%);
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 2.5rem clamp(1.5rem, 4vw, 4rem) 3rem;
  gap: 2rem;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.app-kicker {
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.75rem;
  color: #9aa5ff;
  margin: 0 0 0.5rem;
}

h1 {
  font-size: clamp(1.6rem, 2.6vw, 2.4rem);
  margin: 0 0 0.5rem;
}

.app-subtitle {
  margin: 0;
  color: #b7c1ff;
}

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

.app-main {
  display: grid;
  gap: 2rem;
}

.display {
  border-radius: 1.5rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  background: #0c1224;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  text-align: center;
}

.status {
  font-size: clamp(1rem, 2vw, 1.25rem);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: #9aa5ff;
}

.timer {
  font-size: clamp(4rem, 18vw, 12rem);
  font-weight: 700;
  margin: 1rem 0 0.5rem;
  font-variant-numeric: tabular-nums;
}

.display-row {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.secondary {
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: #c6ceff;
  font-variant-numeric: tabular-nums;
}

.controls {
  display: grid;
  gap: 2rem;
}

.primary-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.adjust-controls,
.panel {
  background: rgba(12, 18, 36, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1rem;
  padding: 1.25rem;
}

.section-title {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
  color: #9aa5ff;
  margin: 0 0 1rem;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

label {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

label span {
  color: #c6ceff;
}

input,
select {
  padding: 0.75rem 0.9rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: #0b1226;
  color: #f5f7ff;
  font-size: 1rem;
}

.input-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.input-row input {
  flex: 1;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.75rem;
}

.toggle input {
  width: 18px;
  height: 18px;
}

button,
.ghost {
  border-radius: 999px;
  padding: 0.9rem 1.4rem;
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  background: #1b2a57;
  color: #f5f7ff;
  transition: transform 0.1s ease, background 0.2s ease;
  text-decoration: none;
  text-align: center;
}

button:hover,
.ghost:hover {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.primary {
  background: #4b6bff;
  color: #fff;
}

.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.small {
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
}

.controls-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(12, 18, 36, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #f5f7ff;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10;
}

.controls-toggle:hover {
  transform: scale(1.05);
}

.lock-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.locked .controls {
  opacity: 0.6;
}

.locked button:not(#unlockBtn) {
  pointer-events: none;
}

.locked input,
.locked select {
  pointer-events: none;
}

:fullscreen .app {
  min-height: 100vh;
  padding: 0;
  gap: 0;
}

:fullscreen .app-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

:fullscreen .app-header,
:fullscreen .controls,
:fullscreen .status,
:fullscreen .display-row {
  display: none;
}

:fullscreen .app.holding .status {
  display: block;
}

:fullscreen .display {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
}

:fullscreen .timer {
  font-size: clamp(6rem, 26vw, 18rem);
  margin: 0;
}

:fullscreen .controls-toggle {
  opacity: 0;
  pointer-events: auto;
}

:fullscreen .controls-toggle:hover,
:fullscreen .controls-toggle:focus-visible {
  opacity: 1;
}

:fullscreen .app.show-controls .controls {
  display: grid;
}

:fullscreen .app.show-controls .app-header {
  display: flex;
}

@media (max-width: 720px) {
  .app {
    padding: 1.5rem 1.25rem 2.5rem;
  }

  .header-actions {
    width: 100%;
  }
}