/* ============================================================
   RAINROOM — style.css
   Dark glassmorphism ambient rain player
   ============================================================ */

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg-deep:       #060b14;
  --bg-mid:        #0d1525;
  --bg-panel:      rgba(255, 255, 255, 0.045);
  --bg-panel-hov:  rgba(255, 255, 255, 0.07);
  --border:        rgba(255, 255, 255, 0.09);
  --border-bright: rgba(255, 255, 255, 0.18);

  --accent:        #4a9eff;
  --accent-dim:    rgba(74, 158, 255, 0.3);
  --accent-glow:   rgba(74, 158, 255, 0.15);

  --rain-streak:   rgba(160, 200, 255, 0.12);

  --text-primary:  rgba(220, 235, 255, 0.92);
  --text-muted:    rgba(160, 185, 220, 0.55);
  --text-dim:      rgba(120, 150, 195, 0.4);

  --font-display:  'Cormorant Garamond', Georgia, serif;
  --font-ui:       'DM Sans', system-ui, sans-serif;

  --radius-panel:  20px;
  --radius-pill:   100px;

  --blur-panel:    blur(18px) saturate(160%);
  --transition:    0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  min-height: 100%;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-weight: 300;
  overflow-x: hidden;
  position: relative;
}

/* ── Rain background ───────────────────────────────────────── */
.rain-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* Deep-space gradient base */
.rain-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, #0d1e3a 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 20% 80%, #091428 0%, transparent 60%),
    linear-gradient(180deg, #060b14 0%, #08101f 50%, #060c16 100%);
}

@keyframes ani-mesh-variant-a {
  0% {
    --x-0: 85%;
    --c-0: hsla(266, 1%, 12%, 1);
    --y-0: 80%;
    --s-start-0: 9%;
    --s-end-0: 55%;
    --x-1: 60%;
    --y-1: 24%;
    --c-1: hsla(335, 2%, 22%, 1);
    --s-start-1: 5%;
    --s-end-1: 72%;
    --x-2: 13%;
    --s-start-2: 5%;
    --s-end-2: 52%;
    --y-2: 82%;
    --c-2: hsla(53, 0%, 0%, 0.49);
    --s-start-3: 13%;
    --s-end-3: 68%;
    --c-3: hsla(299, 4%, 36%, 1);
    --y-3: 7%;
    --x-3: 24%;
  }

  100% {
    --x-0: 31%;
    --c-0: hsla(266, 0%, 12%, 1);
    --y-0: 94%;
    --s-start-0: 9%;
    --s-end-0: 55%;
    --x-1: 2%;
    --y-1: 25%;
    --c-1: hsla(0, 4%, 19%, 1);
    --s-start-1: 5%;
    --s-end-1: 72%;
    --x-2: 98%;
    --s-start-2: 5%;
    --s-end-2: 52%;
    --y-2: 20%;
    --c-2: hsla(54, 0%, 0%, 0.49);
    --s-start-3: 13%;
    --s-end-3: 68%;
    --c-3: hsla(298, 3%, 41%, 1);
    --y-3: 92%;
    --x-3: 95%;
  }
}

@keyframes ani-mesh-variant-b {
  0% {
    --x-0: 11%;
    --s-start-0: 37%;
    --s-end-0: 90%;
    --y-0: 96%;
    --c-0: hsla(227, 100%, 8%, 0.89);
    --x-1: 92%;
    --s-start-1: 31%;
    --s-end-1: 84%;
    --y-1: 89%;
    --c-1: hsla(235, 75%, 37%, 0.85);
    --x-2: 58%;
    --s-start-2: 41%;
    --s-end-2: 61%;
    --y-2: 7%;
    --c-2: hsla(227, 0%, 0%, 0.95);
    --s-start-3: 22%;
    --s-end-3: 59%;
    --x-3: 62%;
    --y-3: 35%;
    --c-3: hsla(225, 60%, 35%, 0.92);
    --x-4: 2%;
    --s-start-4: 19%;
    --s-end-4: 70%;
    --c-4: hsla(217, 34%, 59%, 0.92);
    --y-4: 63%;
  }

  100% {
    --x-0: 6%;
    --s-start-0: 29%;
    --s-end-0: 73%;
    --y-0: 12%;
    --c-0: hsla(235, 71%, 21%, 0.88);
    --x-1: 61%;
    --s-start-1: 8%;
    --s-end-1: 80%;
    --y-1: 6%;
    --c-1: hsla(242, 68%, 51%, 0.87);
    --x-2: 75%;
    --s-start-2: 29%;
    --s-end-2: 80%;
    --y-2: 23%;
    --c-2: hsla(242, 71%, 36%, 0.88);
    --s-start-3: 2%;
    --s-end-3: 81%;
    --x-3: 76%;
    --y-3: 64%;
    --c-3: hsla(230, 75%, 75%, 0.95);
    --x-4: 41%;
    --s-start-4: 24%;
    --s-end-4: 81%;
    --c-4: hsla(210, 75%, 15%, 0.86);
    --y-4: 86%;
  }
}

@keyframes ani-mesh-variant-c {
  0% {
    background-position:
      0% 0%,
      0% 0%,
      0% 0%,
      0% 0%,
      0% 0%;
  }

  100% {
    background-position:
      3% 2%,
      -2% 3%,
      2% -2%,
      -3% -2%,
      1% 3%;
  }
}

@property --x-0 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 85%;
}

@property --c-0 {
  syntax: '<color>';
  inherits: false;
  initial-value: hsla(266, 1%, 12%, 1);
}

@property --y-0 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 80%;
}

@property --s-start-0 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 9%;
}

@property --s-end-0 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 55%;
}

@property --x-1 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 60%;
}

@property --y-1 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 24%;
}

@property --c-1 {
  syntax: '<color>';
  inherits: false;
  initial-value: hsla(335, 2%, 22%, 1);
}

@property --s-start-1 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 5%;
}

@property --s-end-1 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 72%;
}

@property --x-2 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 13%;
}

@property --s-start-2 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 5%;
}

@property --s-end-2 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 52%;
}

@property --y-2 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 82%;
}

@property --c-2 {
  syntax: '<color>';
  inherits: false;
  initial-value: hsla(53, 0%, 0%, 0.49);
}

@property --s-start-3 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 13%;
}

@property --s-end-3 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 68%;
}

@property --c-3 {
  syntax: '<color>';
  inherits: false;
  initial-value: hsla(299, 4%, 36%, 1);
}

@property --y-3 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 7%;
}

@property --x-3 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 24%;
}

@property --x-4 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 2%;
}

@property --s-start-4 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 19%;
}

@property --s-end-4 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 70%;
}

@property --c-4 {
  syntax: '<color>';
  inherits: false;
  initial-value: hsla(217, 34%, 59%, 0.92);
}

@property --y-4 {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 63%;
}

.mesh-ambient-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background-blend-mode: normal, normal, normal, normal, normal;
  transition: opacity 1.2s ease;
  will-change: opacity;
  contain: paint;
}

.mesh-ambient-bg.is-active {
  opacity: 0.42;
}

.mesh-variant-a {
  --x-0: 85%;
  --c-0: hsla(266, 1%, 12%, 1);
  --y-0: 80%;
  --s-start-0: 9%;
  --s-end-0: 55%;
  --x-1: 60%;
  --y-1: 24%;
  --c-1: hsla(335, 2%, 22%, 1);
  --s-start-1: 5%;
  --s-end-1: 72%;
  --x-2: 13%;
  --y-2: 82%;
  --c-2: hsla(53, 0%, 0%, 0.49);
  --s-start-2: 5%;
  --s-end-2: 52%;
  --c-3: hsla(299, 4%, 36%, 1);
  --y-3: 7%;
  --x-3: 24%;
  --s-start-3: 13%;
  --s-end-3: 68%;
  background-color: hsla(0, 0%, 0%, 1);
  background-image:
    radial-gradient(circle at var(--x-0) var(--y-0), var(--c-0) var(--s-start-0), transparent var(--s-end-0)),
    radial-gradient(circle at var(--x-1) var(--y-1), var(--c-1) var(--s-start-1), transparent var(--s-end-1)),
    radial-gradient(circle at var(--x-2) var(--y-2), var(--c-2) var(--s-start-2), transparent var(--s-end-2)),
    radial-gradient(circle at var(--x-3) var(--y-3), var(--c-3) var(--s-start-3), transparent var(--s-end-3));
  animation: ani-mesh-variant-a 10s linear infinite alternate;
}

.mesh-variant-b {
  --x-0: 11%;
  --y-0: 96%;
  --c-0: hsla(227, 100%, 8%, 0.89);
  --s-start-0: 37%;
  --s-end-0: 90%;
  --x-1: 92%;
  --y-1: 89%;
  --c-1: hsla(235, 75%, 37%, 0.85);
  --s-start-1: 31%;
  --s-end-1: 84%;
  --x-2: 58%;
  --y-2: 7%;
  --c-2: hsla(227, 0%, 0%, 0.95);
  --s-start-2: 41%;
  --s-end-2: 61%;
  --x-3: 62%;
  --y-3: 35%;
  --c-3: hsla(225, 60%, 35%, 0.92);
  --s-start-3: 22%;
  --s-end-3: 59%;
  --x-4: 2%;
  --y-4: 63%;
  --c-4: hsla(217, 34%, 59%, 0.92);
  --s-start-4: 19%;
  --s-end-4: 70%;
  background-color: hsla(242, 93%, 25%, 1);
  background-image:
    radial-gradient(circle at var(--x-0) var(--y-0), var(--c-0) var(--s-start-0), transparent var(--s-end-0)),
    radial-gradient(circle at var(--x-1) var(--y-1), var(--c-1) var(--s-start-1), transparent var(--s-end-1)),
    radial-gradient(circle at var(--x-2) var(--y-2), var(--c-2) var(--s-start-2), transparent var(--s-end-2)),
    radial-gradient(circle at var(--x-3) var(--y-3), var(--c-3) var(--s-start-3), transparent var(--s-end-3)),
    radial-gradient(circle at var(--x-4) var(--y-4), var(--c-4) var(--s-start-4), transparent var(--s-end-4));
  animation: ani-mesh-variant-b 10s linear infinite alternate;
}

.mesh-variant-c {
  background-color: hsla(220, 30%, 14%, 1);
  background-image:
    radial-gradient(circle at 0% 5%, hsla(225, 56%, 60%, 0.7) 3.1210986267166043%, transparent 40%),
    radial-gradient(circle at 23% 3%, hsla(210, 96%, 48%, 0.37) 3.1210986267166043%, transparent 76.4190383017679%),
    radial-gradient(circle at 100% 93%, hsla(186, 70%, 55%, 0.21) 3.1210986267166043%, transparent 45.38487571252063%),
    radial-gradient(circle at 96% 103%, hsla(120, 76%, 39%, 0.1) 3.1210986267166043%, transparent 50.0047517726123%),
    radial-gradient(circle at 80% 0%, hsla(158, 80%, 48%, 0.23) 3.1210986267166043%, transparent 24.819747276612727%);
  background-size: 104% 104%, 104% 104%, 104% 104%, 104% 104%, 104% 104%;
  animation: ani-mesh-variant-c 14s ease-in-out infinite alternate;
}

.mesh-variant-a,
.mesh-variant-b,
.mesh-variant-c {
  animation-play-state: paused;
}

.mesh-variant-a.is-active,
.mesh-variant-b.is-active,
.mesh-variant-c.is-active {
  animation-play-state: running;
}

/* Rain streaks — background-position animation for true falling drops */
.rain-layer {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(104deg, transparent 19px, var(--rain-streak) 20px, transparent 21px),
    linear-gradient(104deg, transparent 19px, var(--rain-streak) 20px, transparent 21px),
    linear-gradient(104deg, transparent 19px, var(--rain-streak) 20px, transparent 21px);
  background-repeat: repeat;
}

.rain-layer--far {
  opacity: 0.4;
  --rain-streak: rgba(160, 200, 255, 0.18);
  background-size: 50px 100px, 50px 100px, 50px 100px;
  background-position: 0px 0px, 25px 25px, 35px 50px;
  animation: rainFallFar 1.2s linear infinite;
}

.rain-layer--mid {
  opacity: 0.5;
  --rain-streak: rgba(160, 200, 255, 0.14);
  background-size: 50px 100px, 50px 100px, 50px 100px;
  background-position: 0px 0px, 25px 25px, 35px 50px;
  animation: rainFallMid 0.8s linear infinite;
}

.rain-layer--near {
  opacity: 0.6;
  --rain-streak: rgba(180, 215, 255, 0.10);
  background-size: 50px 100px, 50px 100px, 50px 100px;
  background-position: 0px 0px, 25px 25px, 35px 50px;
  animation: rainFallNear 0.45s linear infinite;
}

@keyframes rainFallFar {
  from { background-position: 0px 0px, 25px 25px, 35px 50px; }
  to   { background-position: -50px 201px, -25px 226px, -15px 251px; }
}

@keyframes rainFallMid {
  from { background-position: 0px 0px, 25px 25px, 35px 50px; }
  to   { background-position: -50px 201px, -25px 226px, -15px 251px; }
}

@keyframes rainFallNear {
  from { background-position: 0px 0px, 25px 25px, 35px 50px; }
  to   { background-position: -50px 201px, -25px 226px, -15px 251px; }
}

/* Window reflection glow */
.window-reflection {
  position: absolute;
  bottom: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 40%;
  background: radial-gradient(ellipse at 50% 100%, rgba(60, 120, 255, 0.04) 0%, transparent 70%);
  filter: blur(40px);
}

/* Fog layer */
.fog-layer {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 100% 30% at 50% 100%, rgba(10, 25, 60, 0.4) 0%, transparent 100%),
    radial-gradient(ellipse 50% 20% at 30% 60%, rgba(10, 20, 50, 0.2) 0%, transparent 80%);
  animation: fogDrift 18s ease-in-out infinite alternate;
}

@keyframes fogDrift {
  from { opacity: 0.6; transform: translateX(0); }
  to   { opacity: 1.0; transform: translateX(15px); }
}

/* ── App layout ────────────────────────────────────────────── */
.app {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin: 0 auto;
  padding: 48px 20px 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

/* ── Header ────────────────────────────────────────────────── */
.app__header {
  text-align: center;
  margin-bottom: 8px;
}

.app__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 8vw, 3.2rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  line-height: 1;
  text-shadow: 0 0 40px rgba(100, 160, 255, 0.25);
}

.app__subtitle {
  margin-top: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.app__mood {
  margin-top: 10px;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  transition: color var(--transition);
}

/* ── Play button section ───────────────────────────────────── */
.player {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin: 8px 0 12px;
}

.play-btn {
  position: relative;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 1.5px solid var(--border-bright);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: var(--blur-panel);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  outline: none;
}

.play-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(74, 158, 255, 0.5);
  transform: scale(1.04);
}

.play-btn:active {
  transform: scale(0.97);
}

.play-btn:focus-visible {
  box-shadow: 0 0 0 3px var(--accent-dim);
}

/* Pulse rings — only visible when playing */
.play-btn__ring {
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  border: 1px solid var(--accent-dim);
  opacity: 0;
  pointer-events: none;
}

.play-btn.is-playing .play-btn__ring--1 {
  animation: ringPulse 2.4s ease-out infinite;
}

.play-btn.is-playing .play-btn__ring--2 {
  animation: ringPulse 2.4s ease-out 1.2s infinite;
}

@keyframes ringPulse {
  0%   { transform: scale(1);   opacity: 0.6; }
  100% { transform: scale(1.9); opacity: 0; }
}

/* Glow when playing */
.play-btn.is-playing {
  border-color: var(--accent-dim);
  box-shadow:
    0 0 30px var(--accent-glow),
    0 0 60px rgba(74, 158, 255, 0.08),
    inset 0 0 20px rgba(74, 158, 255, 0.06);
}

/* Icon switching */
.play-btn__icon {
  width: 28px;
  height: 28px;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.play-btn__icon--pause {
  position: absolute;
  opacity: 0;
  transform: scale(0.8);
}

.play-btn.is-playing .play-btn__icon--play {
  opacity: 0;
  transform: scale(0.8);
}

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

/* Timer display */
.timer-display {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  min-width: 80px;
  text-align: center;
  transition: color var(--transition);
}

.timer-display.is-active {
  color: var(--accent);
}

/* ── Glass panels ──────────────────────────────────────────── */
.glass-panel {
  width: 100%;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-panel);
  padding: 22px 24px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  transition: border-color var(--transition), background var(--transition);
}

.glass-panel:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.3);
}

.panel__label {
  font-family: var(--font-ui);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(220, 235, 255, 0.75);
  margin-bottom: 16px;
}

/* ── Mode tabs ─────────────────────────────────────────────── */
.mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.mode-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: var(--transition);
  outline: none;
}

.mode-tab:hover {
  background: var(--bg-panel-hov);
  color: var(--text-primary);
  border-color: var(--border-bright);
}

.mode-tab:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.mode-tab--active {
  background: rgba(74, 158, 255, 0.12);
  border-color: rgba(74, 158, 255, 0.35);
  color: var(--text-primary);
  box-shadow: inset 0 0 12px rgba(74, 158, 255, 0.06);
}

.mode-tab__icon {
  font-size: 1.3rem;
  line-height: 1;
}

.mode-tab__name {
  white-space: nowrap;
}

/* ── Mix controls ──────────────────────────────────────────── */
.mix-controls {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.mix-channel {
  display: grid;
  grid-template-columns: 90px 1fr 32px;
  align-items: center;
  gap: 12px;
}

.mix-channel__label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  cursor: default;
  user-select: none;
}

.mix-channel__icon {
  font-size: 1rem;
  line-height: 1;
}

/* Slider track wrapper */
.slider-track {
  position: relative;
  height: 4px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

/* Fill bar */
.slider-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg, rgba(74, 158, 255, 0.6), rgba(74, 158, 255, 0.9));
  pointer-events: none;
  transition: width 0.05s linear;
}

/* Actual range input — overlay on track */
.slider {
  position: absolute;
  inset: -10px 0;
  width: 100%;
  height: calc(100% + 20px);
  opacity: 0;
  cursor: pointer;
  margin: 0;
  -webkit-appearance: none;
  appearance: none;
}

/* Visible thumb via pseudo */
.slider-track::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-primary);
  border: 2px solid var(--bg-mid);
  box-shadow: 0 0 8px rgba(74, 158, 255, 0.4);
  pointer-events: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  /* thumb position updated by JS via CSS var */
  left: var(--thumb-pos, 80%);
}

.slider-track:hover::after {
  transform: translate(-50%, -50%) scale(1.2);
  box-shadow: 0 0 14px rgba(74, 158, 255, 0.6);
}

.mix-channel__value {
  font-size: 0.68rem;
  color: var(--text-dim);
  text-align: right;
  font-variant-numeric: tabular-nums;
  min-width: 24px;
}

/* ── Mix sub-layer channels ─────────────────────────────────── */
.mix-channel--sub .mix-channel__label {
  color: var(--text-dim);
}

.mix-channel--sub .slider-fill {
  background: linear-gradient(90deg, rgba(120, 170, 255, 0.4), rgba(120, 170, 255, 0.65));
}

.mix-channel--sub .slider-track::after {
  width: 11px;
  height: 11px;
  box-shadow: 0 0 6px rgba(120, 170, 255, 0.3);
}

/* ── Presets ───────────────────────────────────────────────── */
.presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.presets--4 {
  grid-template-columns: repeat(4, 1fr);
}

.preset-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: var(--transition);
  outline: none;
}

.preset-btn:hover {
  background: var(--bg-panel-hov);
  color: var(--text-primary);
  border-color: var(--border-bright);
  transform: translateY(-1px);
}

.preset-btn:active {
  transform: translateY(0);
}

.preset-btn:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.preset-btn--active {
  background: rgba(74, 158, 255, 0.1);
  border-color: rgba(74, 158, 255, 0.3);
  color: var(--text-primary);
}

.preset-btn__icon {
  font-size: 1.3rem;
  line-height: 1;
}

.preset-btn__name {
  white-space: nowrap;
}

/* ── Timer tabs ────────────────────────────────────────────── */
.timer-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.timer-tab {
  padding: 10px 4px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  transition: var(--transition);
  text-align: center;
  outline: none;
}

.timer-tab:hover {
  background: var(--bg-panel-hov);
  color: var(--text-primary);
  border-color: var(--border-bright);
}

.timer-tab:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.timer-tab--active {
  background: rgba(74, 158, 255, 0.12);
  border-color: rgba(74, 158, 255, 0.35);
  color: var(--accent);
}

/* ── Footer ────────────────────────────────────────────────── */
.app__footer {
  margin-top: 12px;
  text-align: center;
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.footer-link {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-link:focus-visible {
  outline: 1px solid var(--accent-dim);
  outline-offset: 4px;
}

/* ── Fade-out transition helper ────────────────────────────── */
.fade-out-active {
  animation: masterFadeOut 4s ease-in-out forwards;
}

@keyframes masterFadeOut {
  0%   { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Media: desktop spaciousness ───────────────────────────── */
@media (min-width: 600px) {
  .app {
    padding: 64px 24px 80px;
    gap: 24px;
  }

  .play-btn {
    width: 116px;
    height: 116px;
  }

  .glass-panel {
    padding: 26px 30px;
  }
}

/* ── Mobile: narrow screens ────────────────────────────────── */
@media (max-width: 380px) {
  .app {
    padding: 32px 14px 48px;
  }

  .glass-panel {
    padding: 16px 16px;
  }

  /* Preset grid: allow names to wrap and shrink text */
  .preset-btn {
    padding: 10px 4px;
    font-size: 0.62rem;
  }

  .preset-btn__name {
    white-space: normal;
    text-align: center;
    line-height: 1.2;
  }

  .preset-btn__icon {
    font-size: 1.1rem;
  }

  /* Timer tabs */
  .timer-tab {
    font-size: 0.62rem;
    padding: 8px 2px;
  }

  /* Mix label column narrower */
  .mix-channel {
    grid-template-columns: 78px 1fr 26px;
    gap: 8px;
  }

  .mix-channel__label {
    font-size: 0.68rem;
  }
}

/* ── Reduced motion ────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .mesh-ambient-bg,
  .rain-layer,
  .fog-layer,
  .play-btn__ring {
    animation: none !important;
  }
  * {
    transition-duration: 0.01ms !important;
  }
}