/* Froggywater — Gallery Print.
   BEMIT: .o- objects, .c- components, .u- utilities, is-/has- states. */

@font-face {
  font-family: "Fraunces";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("fonts/fraunces-latin.woff2") format("woff2");
}

:root {
  --paper: #f6f1e7;
  --ink: #1a160f;
  --ink-soft: #8c8371;
  --hairline: #d9d0be;
  --vermillion: #d8451f;
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
}

* {
  box-sizing: border-box;
  margin: 0;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-variation-settings: "opsz" 24;
  line-height: 1.45;
  min-height: 100vh;
}

/* Faint paper grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.55 0 0 0 0 0.51 0 0 0 0 0.44 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Objects */

.o-page {
  max-width: 36rem;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 3rem;
}

/* Desktop: hero and settings sit side by side */
@media (min-width: 56rem) {
  .o-page {
    max-width: 62rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }

  .o-layout {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 4.5rem;
    align-items: center;
  }

  .o-layout .c-hero {
    margin-bottom: 0;
  }
}

/* Masthead */

.c-masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 0.6rem;
  margin-bottom: 2rem;
}

.c-masthead__name {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.c-masthead__tagline {
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* Hero */

.c-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 2.5rem;
}

.c-hero__figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: scale(1);
}

.c-hero__figure.is-pulsing {
  animation: pulse 0.3s ease-out;
}

.c-hero__figure.is-pulsing--accent {
  animation: pulse-accent 0.38s ease-out;
}

@keyframes pulse {
  0% { transform: scale(1.012); }
  100% { transform: scale(1); }
}

@keyframes pulse-accent {
  0% { transform: scale(1.03); color: var(--vermillion); }
  100% { transform: scale(1); color: var(--ink); }
}

.c-hero__bpm {
  font-size: clamp(7rem, 26vw, 11rem);
  font-weight: 340;
  font-variation-settings: "opsz" 144;
  font-variant-numeric: proportional-nums;
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.c-hero__unit {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-top: 0.5rem;
}

/* Ramp progress line */

.c-ramp {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  width: 100%;
  max-width: 24rem;
  margin: 1.8rem 0 2rem;
}

.c-ramp__bound {
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  min-width: 2.2rem;
  text-align: center;
}

.c-ramp__line {
  --progress: 0;
  position: relative;
  flex: 1;
  height: 1px;
  background: var(--hairline);
}

.c-ramp__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: calc(var(--progress) * 100%);
  background: var(--vermillion);
  transition: width 0.4s ease;
}

.c-ramp__dot {
  position: absolute;
  top: 50%;
  left: calc(var(--progress) * 100%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  transform: translate(-50%, -50%);
  transition: left 0.4s ease;
}

/* Transport */

.c-transport {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

/* Buttons */

.c-btn {
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: 0;
  padding: 0.65rem 2rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.c-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

.c-btn:focus-visible {
  outline: 2px solid var(--vermillion);
  outline-offset: 2px;
}

.c-btn--primary {
  background: var(--ink);
  color: var(--paper);
  min-width: 8.5rem;
}

.c-btn--primary:hover {
  background: var(--vermillion);
  border-color: var(--vermillion);
}

.c-btn--icon {
  display: grid;
  place-items: center;
  width: 3.4rem;
  height: 3.1rem;
  padding: 0;
}

.c-btn--icon.c-btn--primary {
  min-width: 5.5rem;
}

.c-icon {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

#btn-play .c-icon--pause,
#btn-play.is-playing .c-icon--play {
  display: none;
}

#btn-play.is-playing .c-icon--pause {
  display: block;
}

.c-btn--tap {
  padding: 0.45rem 1.1rem;
  border-color: var(--hairline);
}

.c-btn--tap:hover {
  border-color: var(--ink);
  background: transparent;
  color: var(--ink);
}

.c-btn--tap:active {
  background: var(--vermillion);
  border-color: var(--vermillion);
  color: var(--paper);
}

/* Settings rows */

.c-settings {
  border-top: 1px solid var(--ink);
}

.c-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--hairline);
}

.c-row__lead {
  flex: 1;
}

.c-row__label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.c-row__controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.c-row__controls--wide {
  flex: 1;
  max-width: 14rem;
}

/* Numeric inputs & select */

.c-num {
  font-family: inherit;
  font-size: 1.6rem;
  font-weight: 400;
  font-variation-settings: "opsz" 60;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  width: 4.6rem;
  text-align: right;
  padding: 0.1rem 0;
}

.c-num:hover {
  border-bottom-color: var(--hairline);
}

.c-num:focus {
  outline: none;
  border-bottom-color: var(--vermillion);
}

.c-num::-webkit-outer-spin-button,
.c-num::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.c-num[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
  cursor: ns-resize;
  touch-action: none;
}

.c-num.is-scrubbing {
  border-bottom-color: var(--vermillion);
  color: var(--vermillion);
  user-select: none;
}

.c-num--select {
  appearance: none;
  text-align: right;
  cursor: pointer;
  width: auto;
  padding-right: 1.1rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%238c8371' stroke-width='1.2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right center;
}

/* Slider */

.c-slider {
  appearance: none;
  width: 100%;
  height: 1px;
  background: var(--hairline);
  outline: none;
  cursor: pointer;
}

.c-slider::-webkit-slider-thumb {
  appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: none;
}

.c-slider::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: none;
}

.c-slider:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--vermillion);
  outline-offset: 2px;
}

/* Toggle */

.c-toggle {
  appearance: none;
  width: 2.7rem;
  height: 1.4rem;
  border: 1px solid var(--ink);
  border-radius: 1rem;
  background: transparent;
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
}

.c-toggle::after {
  content: "";
  position: absolute;
  top: 0.16rem;
  left: 0.18rem;
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: var(--ink-soft);
  transition: transform 0.18s ease, background 0.18s ease;
}

.c-toggle:checked::after {
  background: var(--vermillion);
  transform: translateX(1.26rem);
}

.c-toggle:focus-visible {
  outline: 2px solid var(--vermillion);
  outline-offset: 2px;
}

/* Captions */

.c-caption {
  font-style: italic;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-top: 0.25rem;
}

.c-caption--center {
  text-align: center;
}

.c-kbd {
  font-style: normal;
  font-family: inherit;
  font-size: 0.75rem;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 0 0.28rem;
}

/* Small screens */

@media (max-width: 30rem) {
  .o-page {
    padding-top: 1.25rem;
    padding-bottom: 2rem;
  }

  .c-masthead {
    margin-bottom: 1.25rem;
  }

  .c-hero {
    margin-bottom: 1.5rem;
  }

  .c-hero__bpm {
    font-size: clamp(5rem, 22vw, 7rem);
  }

  .c-hero__unit {
    margin-top: 0.2rem;
  }

  .c-ramp {
    margin: 1.1rem 0 1.4rem;
  }

  .c-row {
    padding: 0.65rem 0;
    gap: 1rem;
  }

  .c-row__lead .c-caption {
    font-size: 0.75rem;
  }

  .c-num {
    font-size: 1.4rem;
  }

  .c-btn--tap {
    padding: 0.35rem 0.8rem;
  }

  .c-row__controls--wide {
    max-width: 10rem;
  }
}