:root {
  --bg-top: #f2efe1;
  --bg-bottom: #b8d8c5;
  --ink: #17231f;
  --ink-soft: #335047;
  --panel: rgba(255, 255, 255, 0.74);
  --accent: #d45734;
  --accent-ink: #fff8f5;
  --steady: #598f7d;
  --intense: #c95737;
  --slow: #2f6f8d;
  --fast: #e08f35;
  --track: rgba(23, 35, 31, 0.12);
  --shadow: 0 22px 58px rgba(34, 64, 52, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 8%, rgba(255, 255, 255, 0.72) 0%, rgba(255, 255, 255, 0) 52%),
    radial-gradient(circle at 88% 82%, rgba(47, 111, 141, 0.18) 0%, rgba(47, 111, 141, 0) 46%),
    linear-gradient(150deg, var(--bg-top), var(--bg-bottom));
  font-family: "Chivo", "Segoe UI", sans-serif;
  line-height: 1.4;
}

.shell {
  width: min(1060px, 92vw);
  margin: 3.2rem auto 3.8rem;
  display: grid;
  grid-template-columns: minmax(260px, 360px) 1fr;
  grid-template-areas:
    "hero hero"
    "control monitor"
    "pulse monitor";
  gap: 1.2rem;
}

.hero,
.control-card,
.monitor-card,
.pulse-card {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.hero {
  grid-area: hero;
  padding: 1.5rem 1.6rem;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

h1,
h2,
h3 {
  font-family: "Bricolage Grotesque", "Trebuchet MS", sans-serif;
  margin: 0;
}

h1 {
  margin-top: 0.28rem;
  font-size: clamp(2rem, 2.2vw + 1.35rem, 3.1rem);
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0.45rem 0 0;
  color: var(--ink-soft);
}

.control-card {
  grid-area: control;
  padding: 1.2rem;
}

.control-card h2 {
  margin-bottom: 0.8rem;
  font-size: 1.45rem;
}

label,
output,
.hint,
.topline p,
.moment,
.bpm-line,
.upcoming-list li,
.pulse-card p {
  font-size: 0.96rem;
}

label {
  display: block;
  margin: 0.52rem 0 0.32rem;
  font-weight: 600;
}

select,
input[type="range"] {
  width: 100%;
}

select {
  border-radius: 11px;
  border: 1px solid rgba(23, 35, 31, 0.24);
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink);
  padding: 0.68rem 0.72rem;
  font: inherit;
}

.duration-row {
  margin-top: 0.7rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

output {
  font-weight: 700;
  color: var(--slow);
}

input[type="range"] {
  margin-top: 0.2rem;
  accent-color: var(--accent);
}

.hint {
  margin: 0.72rem 0 1rem;
  color: var(--ink-soft);
}

.button-row {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border-radius: 999px;
  border: 1px solid rgba(23, 35, 31, 0.2);
  padding: 0.58rem 1rem;
  font: 600 0.94rem "Chivo", "Segoe UI", sans-serif;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.84);
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(23, 35, 31, 0.36);
}

.btn:disabled {
  opacity: 0.54;
  cursor: default;
}

.btn.accent {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn.ghost {
  background: rgba(255, 255, 255, 0.48);
}

.monitor-card {
  grid-area: monitor;
  padding: 1.2rem;
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.topline {
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.topline p {
  margin: 0;
  color: var(--ink-soft);
}

.moment {
  margin: 0;
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  padding: 0.32rem 0.75rem;
  font-weight: 700;
  border: 1px solid transparent;
}

.moment.steady {
  background: rgba(89, 143, 125, 0.16);
  color: var(--steady);
  border-color: rgba(89, 143, 125, 0.32);
}

.moment.intense {
  background: rgba(201, 87, 55, 0.14);
  color: var(--intense);
  border-color: rgba(201, 87, 55, 0.32);
}

.moment.slow {
  background: rgba(47, 111, 141, 0.14);
  color: var(--slow);
  border-color: rgba(47, 111, 141, 0.32);
}

.moment.fast {
  background: rgba(224, 143, 53, 0.14);
  color: #9a5710;
  border-color: rgba(224, 143, 53, 0.32);
}

.bpm-line {
  margin: 0;
  font-size: clamp(1.45rem, 2vw + 1rem, 2.45rem);
  font-family: "Bricolage Grotesque", "Trebuchet MS", sans-serif;
}

.bpm-line span {
  font-size: 1.16em;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #dd7a41, #2f6f8d);
  transition: width 0.16s linear;
}

.segment-rail {
  display: flex;
  gap: 4px;
  width: 100%;
  min-height: 16px;
}

.segment-block {
  min-width: 5px;
  border-radius: 999px;
  opacity: 0.52;
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.segment-block.steady {
  background: var(--steady);
}

.segment-block.intense {
  background: var(--intense);
}

.segment-block.slow {
  background: var(--slow);
}

.segment-block.fast {
  background: var(--fast);
}

.segment-block.active {
  opacity: 1;
  transform: scaleY(1.15);
}

h3 {
  margin-top: 0.2rem;
  font-size: 1.08rem;
}

.upcoming-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.32rem;
}

.upcoming-list li {
  margin: 0;
  color: var(--ink-soft);
}

.pulse-card {
  grid-area: pulse;
  padding: 1.2rem;
  text-align: center;
  display: grid;
  place-items: center;
  gap: 0.65rem;
}

.pulse-card p {
  margin: 0;
  color: var(--ink-soft);
}

.pulse-node {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 28%, rgba(255, 255, 255, 0.82) 0%, rgba(255, 255, 255, 0) 58%),
    linear-gradient(145deg, #de7743, #2f6f8d);
  box-shadow: 0 15px 28px rgba(47, 111, 141, 0.34);
}

.pulse-node.beat {
  animation: pulse-beat 0.36s ease-out;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: reveal-in 0.75s cubic-bezier(0.2, 0.76, 0.18, 1) forwards;
}

.delay-1 { animation-delay: 0.02s; }
.delay-2 { animation-delay: 0.12s; }
.delay-3 { animation-delay: 0.24s; }
.delay-4 { animation-delay: 0.34s; }

@keyframes reveal-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-beat {
  0% {
    transform: scale(1);
    filter: saturate(1);
  }
  40% {
    transform: scale(1.17);
    filter: saturate(1.35);
  }
  100% {
    transform: scale(1);
    filter: saturate(1);
  }
}

@media (max-width: 910px) {
  .shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "hero"
      "control"
      "monitor"
      "pulse";
  }

  .pulse-card {
    padding-bottom: 1.35rem;
  }
}