/* ============================================================
   BONFIRE ROOM - style.css
   Cinematic noir ambient audio mixer
   ============================================================ */

:root {
  --bg: #050505;
  --surface: #131313;
  --surface-low: rgba(28, 27, 27, 0.72);
  --surface-high: rgba(42, 42, 42, 0.52);
  --surface-glass: rgba(255, 255, 255, 0.045);
  --surface-glass-hover: rgba(255, 181, 160, 0.07);
  --border: rgba(93, 64, 56, 0.72);
  --border-soft: rgba(173, 136, 126, 0.22);
  --border-hot: rgba(255, 185, 90, 0.46);

  --ember: #ffb95a;
  --ember-soft: rgba(255, 185, 90, 0.32);
  --ember-haze: rgba(255, 185, 90, 0.1);
  --primary: #ffb5a0;
  --primary-hot: #ff5625;
  --smolder: #b28777;

  --text: #e5e2e1;
  --text-muted: rgba(231, 189, 178, 0.76);
  --text-dim: rgba(173, 136, 126, 0.62);

  --font-display: "EB Garamond", Georgia, serif;
  --font-ui: "Manrope", system-ui, sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --blur-panel: blur(20px) saturate(130%);
  --transition: 180ms ease;
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  min-height: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 18%, rgba(255, 181, 160, 0.07), transparent 28%),
    radial-gradient(ellipse at 50% 100%, rgba(198, 131, 21, 0.12), transparent 42%),
    linear-gradient(180deg, #050505 0%, #0c0b0b 52%, #13100f 100%);
  color: var(--text);
  font-family: var(--font-ui);
  font-weight: 400;
  overflow-x: hidden;
  position: relative;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

.fire-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.fire-bg::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 18% 16%, rgba(255, 181, 160, 0.055), transparent 20%),
    radial-gradient(circle at 82% 12%, rgba(236, 188, 170, 0.04), transparent 24%),
    radial-gradient(circle at 50% 105%, rgba(255, 86, 37, 0.12), transparent 36%);
  filter: blur(12px);
}

.fire-bg__ember-pool {
  position: absolute;
  right: -20%;
  bottom: -18%;
  left: -20%;
  height: 42%;
  background: radial-gradient(ellipse at 50% 100%, rgba(255, 185, 90, 0.13), rgba(177, 45, 0, 0.05) 42%, transparent 70%);
  filter: blur(42px);
}

.fire-bg__smoke {
  position: absolute;
  width: 44vw;
  min-width: 280px;
  height: 62vh;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(231, 189, 178, 0.035), transparent 68%);
  filter: blur(72px);
  opacity: 0.65;
}

.smoke--a {
  left: 7%;
  top: 12%;
  animation: ambientSmokeA 22s ease-in-out infinite alternate;
}

.smoke--b {
  right: 4%;
  bottom: 6%;
  animation: ambientSmokeB 28s ease-in-out infinite alternate;
}

@keyframes ambientSmokeA {
  from { transform: translate3d(0, 0, 0) scale(1); opacity: 0.32; }
  to { transform: translate3d(22px, -26px, 0) scale(1.08); opacity: 0.56; }
}

@keyframes ambientSmokeB {
  from { transform: translate3d(0, 0, 0) scale(1.06); opacity: 0.28; }
  to { transform: translate3d(-28px, -34px, 0) scale(0.98); opacity: 0.5; }
}

.app {
  position: relative;
  z-index: 1;
  width: min(100%, 560px);
  margin: 0 auto;
  padding: 24px 20px 56px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.app__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 40px;
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(14, 14, 14, 0.76);
  backdrop-filter: var(--blur-panel);
  -webkit-backdrop-filter: var(--blur-panel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.language-toggle__button {
  min-width: 42px;
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}

.language-toggle__button:hover {
  color: var(--text);
  background: rgba(255, 181, 160, 0.05);
}

.language-toggle__button:focus-visible,
.app__info-btn:focus-visible,
.play-btn:focus-visible,
.preset-btn:focus-visible,
.timer-tab:focus-visible,
.info-modal__close:focus-visible,
.footer-link:focus-visible {
  outline: 1px solid var(--ember);
  outline-offset: 3px;
}

.language-toggle__button--active {
  background: rgba(255, 185, 90, 0.13);
  color: var(--ember);
  box-shadow: 0 0 18px rgba(255, 185, 90, 0.1), inset 0 0 0 1px rgba(255, 185, 90, 0.18);
}

.app__info-btn {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(14, 14, 14, 0.76);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition), box-shadow var(--transition);
}

.app__info-btn:hover {
  border-color: var(--border-hot);
  background: var(--surface-glass-hover);
  color: var(--ember);
  box-shadow: 0 0 18px rgba(255, 185, 90, 0.09);
}

.ambient-hero {
  position: relative;
  isolation: isolate;
  padding: 30px 0 8px;
  text-align: center;
}

.ambient-hero__glow {
  position: absolute;
  inset: -24px 6% auto;
  z-index: -1;
  height: 180px;
  border-radius: 50%;
  background:
    radial-gradient(ellipse at 50% 42%, rgba(255, 185, 90, 0.16), transparent 55%),
    radial-gradient(ellipse at 50% 72%, rgba(255, 86, 37, 0.09), transparent 64%);
  filter: blur(24px);
  opacity: 0.9;
}

.ambient-hero__eyebrow,
.panel__label {
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.ambient-hero__eyebrow {
  color: var(--ember);
  margin-bottom: 12px;
}

.ambient-hero__title {
  font-family: var(--font-display);
  font-size: 3.25rem;
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: 0;
  color: var(--text);
  text-shadow:
    0 0 30px rgba(255, 185, 90, 0.12),
    0 0 72px rgba(255, 86, 37, 0.08);
}

.ambient-hero__subtitle {
  max-width: min(720px, 100%);
  margin: 18px auto 0;
  color: var(--text-muted);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  line-height: 1.75;
  text-wrap: balance;
  overflow-wrap: normal;
  word-break: keep-all;
}

html[lang="ja"] .ambient-hero__subtitle {
  max-width: min(760px, 100%);
  letter-spacing: 0.02em;
}

.player {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 6px 0 2px;
}

.play-btn {
  position: relative;
  width: 108px;
  height: 108px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-hot);
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 185, 90, 0.13), rgba(255, 181, 160, 0.035) 58%, rgba(14, 14, 14, 0.78) 100%);
  color: var(--ember);
  cursor: pointer;
  box-shadow:
    0 0 34px rgba(255, 185, 90, 0.11),
    inset 0 0 24px rgba(255, 185, 90, 0.045);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.play-btn:hover {
  transform: translateY(-1px);
  border-color: var(--ember);
  box-shadow:
    0 0 42px rgba(255, 185, 90, 0.18),
    inset 0 0 30px rgba(255, 185, 90, 0.07);
}

.play-btn:active {
  transform: translateY(0) scale(0.98);
}

.play-btn__ring {
  position: absolute;
  inset: -1px;
  border: 1px solid rgba(255, 185, 90, 0.32);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
}

.play-btn.is-playing {
  border-color: var(--ember);
  color: #ffddb6;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 185, 90, 0.21), rgba(255, 86, 37, 0.07) 58%, rgba(14, 14, 14, 0.8) 100%);
  box-shadow:
    0 0 52px rgba(255, 185, 90, 0.2),
    0 0 88px rgba(255, 86, 37, 0.08),
    inset 0 0 32px rgba(255, 185, 90, 0.08);
}

.play-btn.is-playing .play-btn__ring--1 {
  animation: listeningPulse 2.8s ease-out infinite;
}

.play-btn.is-playing .play-btn__ring--2 {
  animation: listeningPulse 2.8s ease-out 1.4s infinite;
}

@keyframes listeningPulse {
  from { transform: scale(1); opacity: 0.42; }
  to { transform: scale(1.9); opacity: 0; }
}

.play-btn__icon {
  width: 28px;
  height: 28px;
  transition: opacity var(--transition), transform var(--transition);
}

.play-btn__icon--pause {
  position: absolute;
  opacity: 0;
  transform: scale(0.82);
}

.play-btn.is-playing .play-btn__icon--play {
  opacity: 0;
  transform: scale(0.82);
}

.play-btn.is-playing .play-btn__icon--pause {
  opacity: 1;
  transform: scale(1);
}

.timer-display {
  min-height: 28px;
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-align: center;
  transition: color var(--transition), text-shadow var(--transition);
}

.timer-display.is-active {
  color: var(--ember);
  text-shadow: 0 0 22px rgba(255, 185, 90, 0.14);
}

.glass-panel {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.024)),
    var(--surface-low);
  backdrop-filter: var(--blur-panel);
  -webkit-backdrop-filter: var(--blur-panel);
  box-shadow:
    0 18px 52px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.045);
}

.glass-panel {
  padding: 22px 20px;
}

.panel__label {
  color: var(--text-muted);
  margin-bottom: 18px;
}

.mix-controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mix-channel {
  display: grid;
  grid-template-columns: minmax(90px, 0.72fr) minmax(112px, 1fr) 44px;
  align-items: center;
  gap: 12px;
}

.mix-channel__label {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.3;
}

.slider-track {
  position: relative;
  height: 4px;
  border-radius: var(--radius-full);
  background: rgba(93, 64, 56, 0.54);
}

.slider-track::before {
  content: "";
  position: absolute;
  inset: -10px 0;
}

.slider-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #c68315 0%, #ffb95a 72%, #ffdbb6 100%);
  box-shadow: 0 0 14px rgba(255, 185, 90, 0.18);
  pointer-events: none;
  transition: width 60ms linear;
}

.slider {
  position: absolute;
  inset: -16px 0;
  width: 100%;
  height: 36px;
  margin: 0;
  cursor: pointer;
  opacity: 0;
  appearance: none;
  -webkit-appearance: none;
}

.slider-track::after {
  content: "";
  position: absolute;
  top: 50%;
  left: var(--thumb-pos, 50%);
  width: 16px;
  height: 16px;
  border: 2px solid var(--surface);
  border-radius: 50%;
  background: #ffddb6;
  box-shadow: 0 0 16px rgba(255, 185, 90, 0.44);
  transform: translate(-50%, -50%);
  transition: transform var(--transition), box-shadow var(--transition);
  pointer-events: none;
}

.slider-track:hover::after,
.slider-track:has(.slider:focus-visible)::after {
  transform: translate(-50%, -50%) scale(1.16);
  box-shadow: 0 0 22px rgba(255, 185, 90, 0.62);
}

.slider-track:has(.slider:focus-visible) {
  outline: 1px solid var(--ember);
  outline-offset: 10px;
}

.mix-channel__value {
  color: var(--text-dim);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.presets {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.preset-btn,
.timer-tab {
  border: 1px solid var(--border-soft);
  background: rgba(14, 14, 14, 0.42);
  color: var(--text-muted);
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), color var(--transition), background var(--transition), box-shadow var(--transition);
}

.preset-btn {
  min-height: 82px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 7px;
  padding: 15px 14px;
  border-radius: var(--radius-md);
  text-align: left;
}

.preset-btn:hover,
.timer-tab:hover {
  border-color: var(--border-hot);
  background: var(--surface-glass-hover);
  color: var(--text);
}

.preset-btn:active,
.timer-tab:active {
  transform: scale(0.985);
}

.preset-btn--active,
.timer-tab--active {
  border-color: var(--border-hot);
  background: rgba(255, 185, 90, 0.105);
  color: var(--ember);
  box-shadow: 0 0 24px rgba(255, 185, 90, 0.08), inset 0 0 0 1px rgba(255, 185, 90, 0.05);
}

.preset-btn__name {
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1.25;
}

.preset-btn__sub {
  color: var(--text-dim);
  font-size: 0.66rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.preset-btn--active .preset-btn__sub {
  color: rgba(255, 185, 90, 0.72);
}

.timer-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.timer-tab {
  min-height: 44px;
  padding: 10px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-align: center;
}

.info-modal__links a {
  color: var(--ember);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.app__footer {
  padding-top: 2px;
  text-align: center;
}

.footer-link {
  color: var(--text-dim);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--text-muted);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(5, 5, 5, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-backdrop.hidden {
  display: none;
}

.info-modal {
  position: fixed;
  inset: 0;
  z-index: 101;
  width: min(560px, calc(100vw - 40px));
  max-height: min(88vh, 660px);
  margin: auto;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.022)),
    rgba(19, 19, 19, 0.96);
  backdrop-filter: var(--blur-panel);
  -webkit-backdrop-filter: var(--blur-panel);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.68), 0 0 52px rgba(255, 185, 90, 0.08);
  color: var(--text);
}

.info-modal:not([open]) {
  display: none;
}

.info-modal__header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 21px 22px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(19, 19, 19, 0.98);
}

.info-modal__title {
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 500;
  line-height: 1;
}

.info-modal__close {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(14, 14, 14, 0.58);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.info-modal__close:hover {
  border-color: var(--border-hot);
  background: rgba(255, 181, 160, 0.055);
  color: var(--ember);
}

.info-modal__body {
  max-height: calc(min(88vh, 660px) - 76px);
  overflow-y: auto;
  padding: 22px;
}

.info-modal__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.info-modal__body h3 {
  margin: 0 0 7px;
  color: var(--ember);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.info-modal__body h3:not(:first-child) {
  margin-top: 22px;
}

.info-modal__body p,
.info-modal__links li {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.75;
}

.info-modal__body p {
  margin-bottom: 10px;
}

.info-modal__links {
  list-style: none;
}

@media (min-width: 600px) {
  .app {
    padding: 34px 24px 72px;
    gap: 24px;
  }

  .ambient-hero {
    padding-top: 38px;
  }

  .ambient-hero__title {
    font-size: 4.9rem;
  }

  .glass-panel {
    padding: 24px 26px;
  }

  .info-modal__grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (min-width: 900px) {
  html[lang="ja"] .ambient-hero__subtitle {
    white-space: nowrap;
  }
}

@media (max-width: 600px) {
  html[lang="ja"] .ambient-hero__subtitle {
    white-space: normal;
    max-width: 22em;
  }
}

@media (max-width: 390px) {
  .app {
    padding: 20px 14px 48px;
    gap: 18px;
  }

  .mix-channel {
    grid-template-columns: 1fr 44px;
    gap: 9px 10px;
  }

  .mix-channel__label {
    grid-column: 1 / 2;
  }

  .slider-track {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .mix-channel__value {
    grid-column: 2 / 3;
    grid-row: 1;
  }

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

  .preset-btn {
    min-height: 72px;
  }

  .timer-tabs {
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}