/* ==============================================
   DESIGN TOKENS
   ============================================== */

:root {
  /* Colors — preserved palette */
  --black: #00503B;
  --white: #ffffff;
  --orange: #FE671D;
  --orange-hover: #e65c00;
  --green: #00ff00;
  --green-bg: rgba(0, 255, 0, 0.05);
  --gray: #333333;
  --light-gray: #00503b21;
  --mid-gray: #00181285;
  --border: #00503b18;
  --bg-panel: #fafaf9;
  --backdrop: rgba(0, 40, 28, 0.45);

  /* New depth colors */
  --bg-body: #f6f5f2;
  --surface: #ffffff;
  --surface-tint: rgba(0, 80, 59, 0.025);

  /* Spacing — fixed scale */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 2.5rem;    /* 40px */
  --space-3xl: 4rem;      /* 64px */

  /* Typography — stronger contrast */
  --text-xs: 0.625rem;    /* 10px */
  --text-sm: 0.75rem;     /* 12px */
  --text-md: 0.8125rem;   /* 13px */
  --text-base: 0.9375rem; /* 15px */
  --text-lg: 1.25rem;     /* 20px */
  --text-xl: 1.625rem;    /* 26px */

  /* Font weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;

  /* Radius — softened but precise */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows — teal-tinted depth */
  --shadow-xs: 0 1px 2px rgba(0, 80, 59, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 80, 59, 0.06), 0 1px 2px rgba(0, 80, 59, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 80, 59, 0.07), 0 2px 4px rgba(0, 80, 59, 0.04);
  --shadow-lg: 0 12px 32px rgba(0, 80, 59, 0.10), 0 4px 8px rgba(0, 80, 59, 0.05);
  --shadow-xl: 0 20px 48px rgba(0, 80, 59, 0.14), 0 8px 16px rgba(0, 80, 59, 0.06);

  /* Motion — intentional curves */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-in: cubic-bezier(0.55, 0.055, 0.675, 0.19);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;

  /* Sizing */
  --input-height: 2.75rem;    /* 44px */
  --input-height-lg: 3.25rem; /* 52px */
  --touch-target: 2.5rem;     /* 40px */
  --max-width: 52rem;         /* 832px */
}


/* ==============================================
   BASE & RESET
   ============================================== */

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

body {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Menlo', monospace;
  font-size: var(--text-md);
  line-height: 1.5;
  background: var(--bg-body);
  color: var(--black);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  letter-spacing: 0.3px;
  min-width: 120px;
}

a {
  transition: color var(--duration-fast) var(--ease-out);
}


/* ==============================================
   LAYOUT
   ============================================== */

.app {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
}

/* Page load stagger */
.app > .header          { animation: fadeInUp 0.5s var(--ease-out) 0ms both; }
.app > .audio-source    { animation: fadeInUp 0.5s var(--ease-out) 50ms both; }
.app > .section-heading { animation: fadeInUp 0.5s var(--ease-out) 100ms both; }
.app > .pack-header     { animation: fadeInUp 0.5s var(--ease-out) 130ms both; }
.app > .preset-slots    { animation: fadeInUp 0.5s var(--ease-out) 160ms both; }
.app > .editor          { animation: fadeInUp 0.5s var(--ease-out) 200ms both; }
.app > .footer          { animation: fadeInUp 0.5s var(--ease-out) 260ms both; }


/* ==============================================
   HEADER
   ============================================== */

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-xl);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.header__titles {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.header__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  letter-spacing: -0.8px;
  line-height: 1.2;
}

.header__subtitle {
  font-size: var(--text-sm);
  color: var(--mid-gray);
  letter-spacing: 0.2px;
}

.header__help {
  color: var(--mid-gray);
  text-decoration: none;
  font-size: var(--text-sm);
  border-bottom: 1px solid transparent;
  transition: all var(--duration-fast) var(--ease-out);
}

.header__help:hover {
  color: var(--black);
  border-bottom-color: var(--black);
}

.header__right {
  display: flex;
  gap: var(--space-sm);
}


/* ==============================================
   MODE TOGGLE — pill shape
   ============================================== */

.mode-toggle {
  display: flex;
  gap: 0;
  background: var(--surface);
  border-radius: var(--radius-full);
  padding: 3px;
  box-shadow: var(--shadow-xs), inset 0 0 0 1px var(--border);
}

.mode-toggle__btn {
  padding: var(--space-sm) var(--space-lg);
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--duration-base) var(--ease-out);
  min-height: 36px;
  width: 110px;
  border-radius: var(--radius-full);
  color: var(--mid-gray);
}

.mode-toggle__btn--active {
  background: var(--black);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.mode-toggle__btn:hover:not(.mode-toggle__btn--active) {
  color: var(--black);
  background: var(--surface-tint);
}


/* ==============================================
   BUTTONS
   ============================================== */

.btn {
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--duration-base) var(--ease-out);
  border-radius: var(--radius-sm);
  min-height: var(--input-height);
  outline: none;
}

.btn:hover:not(:disabled) {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

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

.btn:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

.btn--primary:hover:not(:disabled) {
  background: var(--orange-hover);
  border-color: var(--orange-hover);
}

.btn--import {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  min-width: 120px;
}

.btn--add {
  width: 100%;
  margin-top: var(--space-md);
  padding: var(--space-md);
  font-size: var(--text-md);
  border-radius: var(--radius-md);
  border-style: dashed;
  border-color: var(--border);
  background: transparent;
  color: var(--mid-gray);
  transition: all var(--duration-base) var(--ease-out);
}

.btn--add:hover:not(:disabled) {
  color: var(--black);
  border-color: var(--black);
  border-style: solid;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}


/* ==============================================
   AUDIO CONTROL BAR — elevated surface
   ============================================== */

.audio-source {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: var(--space-lg) var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2xl);
}

.audio-source__emulation,
.audio-source__hardware {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  width: 100%;
  gap: var(--space-md);
}

.audio-source__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.audio-source__label {
  font-size: var(--text-xs);
  padding-bottom: 2px;
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--mid-gray);
}

.audio-source__samples {
  display: flex;
  gap: 0;
}

.audio-source__controls {
  display: flex;
  gap: var(--space-sm);
}


/* ==============================================
   SAMPLE BUTTONS
   ============================================== */

.sample-btn {
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  transition: all var(--duration-base) var(--ease-out);
  min-height: var(--input-height);
}

.sample-btn:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.sample-btn:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-left: none;
}

.sample-btn--active {
  background: var(--black);
  color: var(--white);
}

.sample-btn:hover:not(.sample-btn--active) {
  background: var(--surface-tint);
}


/* ==============================================
   PLAY BUTTON — primary action glow
   ============================================== */

.play-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-xl);
  border: none;
  background: var(--orange);
  color: var(--white);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  letter-spacing: 0.5px;
  justify-content: center;
  text-transform: uppercase;
  transition: all var(--duration-base) var(--ease-out);
  min-height: var(--input-height);
  border-radius: var(--radius-sm);
  outline: none;
  min-width: 120px;
}

.play-btn:hover {
  background: var(--orange-hover);
  box-shadow: 0 4px 20px rgba(254, 103, 29, 0.3);
  transform: translateY(-1px);
}

.play-btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

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

.play-btn--playing {
  background: var(--orange-hover);
}

.play-btn--playing:hover {
  background: var(--orange);
}

.play-btn__icon {
  font-size: var(--text-base);
  display: flex;
  align-items: center;
}


/* ==============================================
   MODULATION SIM BUTTONS
   ============================================== */

.btn--mod:not(.btn--mod-disabled):hover {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.btn--mod-active:not(.btn--mod-disabled) {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
  box-shadow: 0 2px 12px rgba(254, 103, 29, 0.25);
}

.btn--mod-disabled,
.btn--mod-disabled:hover {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--surface);
  color: inherit;
  border-color: var(--border);
  transform: none;
  box-shadow: none;
}


/* ==============================================
   SECTION HEADING
   ============================================== */

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-lg);
}

.section-heading h3 {
  font-size: var(--text-md);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-heading--right {
  display: flex;
  gap: var(--space-sm);
}


/* ==============================================
   PACK HEADER
   ============================================== */

.pack-header {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.pack-header__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex: 1;
}

.pack-header__label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--mid-gray);
}

.pack-header__name {
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--surface);
  width: 100%;
  min-height: var(--input-height);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.pack-header__name:focus {
  outline: none;
  border-color: var(--black);
  box-shadow: 0 0 0 3px rgba(0, 80, 59, 0.08);
}

.pack-header__clear {
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--mid-gray);
  padding: 0 var(--space-sm);
  transition: color var(--duration-fast) var(--ease-out);
  align-self: flex-end;
  display: flex;
  align-items: center;
  min-height: var(--input-height);
  min-width: auto;
}

.pack-header__clear:hover {
  color: var(--orange);
}

.pack-header__clear:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pack-header__clear:disabled:hover {
  color: var(--mid-gray);
}


/* ==============================================
   PRESET SLOTS
   ============================================== */

.preset-slots {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.preset-slot {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  min-height: 80px;
  background: var(--surface);
}

.preset-slot:hover {
  border-color: var(--black);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.preset-slot--active {
  border-color: var(--black);
  border-width: 1px;
  background: var(--black);
  color: var(--white);
  transform: translateY(-1px);
}

.preset-slot--active:hover {
  transform: translateY(-2px);
}

.preset-slot__number {
  display: block;
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.5px;
}

.preset-slot__name {
  display: block;
  font-size: var(--text-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0.7;
}

.preset-slot--active .preset-slot__name {
  opacity: 0.85;
}

.preset-slot__clear {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-xs);
  color: var(--mid-gray);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
  padding: var(--space-xs) 0 var(--space-xs) var(--space-sm);
  text-transform: uppercase;
  min-width: auto;
}

.preset-slot:hover .preset-slot__clear:not(:disabled),
.preset-slot--active .preset-slot__clear:not(:disabled) {
  opacity: 1;
}

.preset-slot__clear:disabled {
  opacity: 0;
  cursor: default;
}

.preset-slot__clear:hover {
  color: var(--orange);
}

.preset-slot--active .preset-slot__clear {
  color: rgba(255, 255, 255, 0.5);
}

.preset-slot--active .preset-slot__clear:hover {
  color: var(--orange);
}


/* ==============================================
   EDITOR
   ============================================== */

.editor {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--space-2xl);
}


/* ==============================================
   PRESET META
   ============================================== */

.preset-meta {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--mid-gray);
}

.form-group--inline {
  flex-direction: row;
  align-items: center;
  gap: var(--space-sm);
}

.form-group--inline label {
  min-width: 70px;
}


/* ==============================================
   FORM CONTROLS
   ============================================== */

.input {
  font-family: inherit;
  font-size: var(--text-base);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  width: 100%;
  min-height: var(--input-height);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.input:focus {
  outline: none;
  border-color: var(--black);
  box-shadow: 0 0 0 3px rgba(0, 80, 59, 0.08);
}

.input--small {
  width: 80px;
}

.select {
  font-family: inherit;
  font-size: var(--text-md);
  padding: var(--space-sm) var(--space-xl) var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  min-width: 120px;
  min-height: var(--input-height);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2300503B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.select:focus {
  outline: none;
  border-color: var(--black);
  box-shadow: 0 0 0 3px rgba(0, 80, 59, 0.08);
}


/* ==============================================
   SECTION TITLES
   ============================================== */

.section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--mid-gray);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}


/* ==============================================
   EFFECT LIST & CARDS
   ============================================== */

.effect-list {
  min-height: 60px;
  margin-bottom: var(--space-sm);
}

.effect-list--empty {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  color: var(--mid-gray);
  font-size: var(--text-md);
  padding: 0;
  margin-bottom: var(--space-sm);
}

.effect-list--hint {
  color: var(--mid-gray);
  font-size: var(--text-sm);
  text-align: center;
  padding: var(--space-sm);
  margin-top: var(--space-sm);
}

.effect-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-sm);
  background: var(--surface);
  transition: all var(--duration-base) var(--ease-out);
}

.effect-card:hover {
  border-color: rgba(0, 80, 59, 0.2);
  box-shadow: var(--shadow-sm);
}

.effect-card:last-child {
  margin-bottom: 0;
}

.effect-card--dragging {
  opacity: 0.5;
  border-style: dashed;
}

.effect-card--ghost {
  opacity: 0.4;
  background: var(--light-gray);
}

.effect-card--sample {
  background: var(--surface-tint);
  border-color: rgba(0, 80, 59, 0.1);
}

.effect-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  position: relative;
}

.effect-card__left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.effect-card__drag {
  cursor: grab;
  font-size: var(--text-lg);
  user-select: none;
  padding: 0;
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  opacity: 0.3;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.effect-card:hover .effect-card__drag {
  opacity: 0.6;
}

.effect-card__drag:active {
  cursor: grabbing;
  opacity: 1;
}

.effect-card__row {
  font-size: var(--text-xs);
  color: var(--white);
  background: var(--black);
  padding: 2px var(--space-sm);
  border-radius: var(--radius-sm);
  font-weight: var(--font-medium);
  letter-spacing: 0.3px;
}

.effect-card__name {
  text-transform: uppercase;
  font-weight: var(--font-semibold);
  font-size: var(--text-md);
  letter-spacing: 0.3px;
}

.effect-card__delete {
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-xs);
  color: var(--mid-gray);
  padding: var(--space-xs) var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color var(--duration-fast) var(--ease-out);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  min-width: auto;
  opacity: 0;
}

.effect-card:hover .effect-card__delete {
  opacity: 1;
}

.effect-card__delete:hover {
  color: var(--orange);
}

.effect-card__params {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}


/* ==============================================
   PARAMETER CONTROLS & SLIDERS
   ============================================== */

.param-control {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.param-control__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.param-control__label {
  font-size: var(--text-xs);
  color: var(--mid-gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.param-control__value {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  min-width: 50px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.param-control__slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--light-gray);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out);
}

.param-control__slider:hover {
  background: rgba(0, 80, 59, 0.15);
}

.param-control__slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--black);
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--black), var(--shadow-sm);
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.param-control__slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 0 1px var(--black), var(--shadow-md);
}

.param-control__slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--black);
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--black);
}


/* ==============================================
   MODULATION PANELS — animated expand
   ============================================== */

.modulation-panels {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mod-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  overflow: hidden;
  transition: border-color var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

.mod-panel:hover {
  border-color: rgba(0, 80, 59, 0.15);
}

.mod-panel--open {
  box-shadow: var(--shadow-xs);
}

.mod-panel__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  cursor: pointer;
  user-select: none;
  transition: background var(--duration-fast) var(--ease-out);
}

.mod-panel__header:hover {
  background: var(--surface-tint);
}

.mod-panel__title {
  flex: 1;
  font-size: var(--text-md);
  font-weight: var(--font-semibold);
}

.mod-panel__chevron {
  font-size: var(--text-xs);
  color: var(--mid-gray);
  transition: transform var(--duration-slow) var(--ease-out);
}

.mod-panel--open .mod-panel__chevron {
  transform: rotate(180deg);
}

/* Animated expand/collapse using grid rows */
.mod-panel__content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--duration-slow) var(--ease-out);
}

.mod-panel--open .mod-panel__content {
  grid-template-rows: 1fr;
}

.mod-panel__content > .mod-controls {
  overflow: hidden;
  padding: 0 var(--space-md);
  border-top: 1px solid transparent;
  transition: padding var(--duration-slow) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);
}

.mod-panel--open .mod-panel__content > .mod-controls {
  padding: var(--space-md);
  border-top-color: var(--border);
}

.mod-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  background: var(--bg-panel);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}


/* ==============================================
   TOGGLE SWITCH
   ============================================== */

.toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle__slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--light-gray);
  transition: background-color var(--duration-base) var(--ease-out);
  border-radius: var(--radius-full);
}

.toggle__slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: var(--white);
  transition: transform var(--duration-base) var(--ease-out);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xs);
}

.toggle input:checked + .toggle__slider {
  background-color: var(--orange);
}

.toggle input:checked + .toggle__slider:before {
  transform: translateX(20px);
}


/* ==============================================
   MODALS — choreographed entrance
   ============================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out),
              visibility var(--duration-base) var(--ease-out);
}

.modal--open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.modal__backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--backdrop);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal__content {
  position: relative;
  background: var(--surface);
  padding: var(--space-xl);
  max-width: 400px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  transform: translateY(12px) scale(0.97);
  transition: transform var(--duration-slow) var(--ease-out);
}

.modal--open .modal__content {
  transform: translateY(0) scale(1);
}

.modal__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.3px;
}

.modal__close {
  margin-top: var(--space-lg);
  width: 100%;
}


/* ==============================================
   EFFECT PICKER
   ============================================== */

.effect-picker {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.effect-picker__item {
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--duration-base) var(--ease-out);
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.effect-picker__item:hover {
  border-color: var(--black);
  background: var(--black);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.effect-picker__item--sample {
  border-color: var(--green);
  color: var(--green);
}

.effect-picker__item--sample:hover {
  background: var(--green);
  color: var(--black);
}

.effect-picker__item--disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}


/* ==============================================
   PROGRESS BAR & MODAL
   ============================================== */

.modal__content--progress {
  text-align: center;
  min-width: 280px;
}

.modal__message {
  font-size: var(--text-sm);
  color: var(--mid-gray);
  margin-bottom: var(--space-md);
}

.modal__status {
  font-size: var(--text-sm);
  color: var(--black);
  margin-top: var(--space-sm);
  font-weight: var(--font-medium);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--light-gray);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--orange);
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.3s var(--ease-out);
}


/* ==============================================
   HELP MODAL
   ============================================== */

.modal__content--help {
  position: relative;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
}

.modal__close-btn {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  font-size: 22px;
  line-height: 1;
  color: var(--mid-gray);
  cursor: pointer;
  padding: var(--space-xs);
  min-width: auto;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.modal__close-btn:hover {
  color: var(--black);
  background: var(--surface-tint);
}

.help-content {
  text-align: left;
}

.help-section {
  margin-bottom: var(--space-lg);
}

.help-section:last-child {
  margin-bottom: 0;
}

.help-section__title {
  font-size: var(--text-md);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-sm);
  color: var(--black);
}

.help-section p {
  font-size: var(--text-sm);
  color: var(--mid-gray);
  margin-bottom: var(--space-sm);
  line-height: 1.6;
}

.help-section p:last-child {
  margin-bottom: 0;
}

.help-section strong {
  color: var(--black);
}

.help-list {
  font-size: var(--text-sm);
  color: var(--mid-gray);
  line-height: 1.6;
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
}

.help-list li {
  margin-bottom: var(--space-xs);
}

.help-list li:last-child {
  margin-bottom: 0;
}


/* ==============================================
   TOAST — refined notification
   ============================================== */

.toast {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  background: var(--black);
  color: var(--white);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  z-index: 1001;
  box-shadow: var(--shadow-lg);
  animation: toastIn var(--duration-slow) var(--ease-out);
}

.toast--error {
  background: var(--orange);
}

.toast--success {
  background: var(--black);
}


/* ==============================================
   FOOTER
   ============================================== */

.footer {
  margin: var(--space-3xl) 0 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

.footer__section {
  margin-bottom: var(--space-md);
}

.footer__heading {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--mid-gray);
}

.footer__text {
  font-size: var(--text-sm);
  color: var(--mid-gray);
  line-height: 1.7;
}

.footer__text a {
  color: var(--black);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all var(--duration-fast) var(--ease-out);
}

.footer__text a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.footer__credit {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  padding-bottom: var(--space-xl);
  border-top: 1px solid var(--border);
  font-size: var(--text-sm);
  color: var(--mid-gray);
}

.footer__credit a {
  color: var(--black);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all var(--duration-fast) var(--ease-out);
}

.footer__credit a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}


/* ==============================================
   CONNECTION / WEBUSB
   ============================================== */

.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  min-height: var(--input-height);
}

.connection-status__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--mid-gray);
  flex-shrink: 0;
  transition: background var(--duration-base) var(--ease-out);
}

.connection-status__dot--connecting {
  background: var(--orange);
  animation: pulse 1.2s var(--ease-in-out) infinite;
}

.connection-status__dot--connected {
  background: #00c853;
  box-shadow: 0 0 6px rgba(0, 200, 83, 0.4);
}

.connection-status__dot--error {
  background: #ff1744;
}

.connection-status__text {
  font-size: var(--text-sm);
}

.btn--connect {
  background: var(--surface);
  border-color: var(--border);
}

.btn--connect:hover:not(:disabled) {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.btn--connect--connected {
  background: rgba(0, 200, 83, 0.06);
  border-color: rgba(0, 200, 83, 0.3);
  color: #00c853;
}

.btn--connect--connected:hover:not(:disabled) {
  background: rgba(255, 23, 68, 0.06);
  border-color: rgba(255, 23, 68, 0.3);
  color: #ff1744;
}

.btn--save-device {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

.btn--save-device:hover:not(:disabled) {
  background: var(--orange-hover);
  border-color: var(--orange-hover);
  box-shadow: 0 4px 20px rgba(254, 103, 29, 0.3);
}

.btn--save-device:disabled,
.btn--save-device:disabled:hover {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--orange);
  border-color: var(--orange);
  transform: none;
  box-shadow: none;
}

.webusb-warning {
  padding: var(--space-sm) var(--space-md);
  background: rgba(254, 103, 29, 0.06);
  border: 1px solid rgba(254, 103, 29, 0.2);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--orange);
}


/* ==============================================
   HARDWARE MODE OVERRIDES
   ============================================== */

.hardware-mode .effect-card__drag {
  visibility: hidden;
}

.hardware-mode .btn--add:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: transparent;
  border-color: var(--border);
  color: var(--mid-gray);
  border-style: dashed;
}

.hardware-mode .btn--add:disabled:hover {
  background: transparent;
  color: var(--mid-gray);
  transform: none;
  box-shadow: none;
}

.hardware-mode--no-edit .effect-card__delete {
  display: none;
}


/* ==============================================
   DRAG & DROP STATES
   ============================================== */

.sortable-ghost {
  opacity: 0.3;
  background: var(--surface-tint);
  border-radius: var(--radius-md);
}

.sortable-chosen {
  opacity: 0.85;
  box-shadow: var(--shadow-md);
}

.sortable-drag {
  opacity: 0;
}


/* ==============================================
   EMPTY & LOADING STATES
   ============================================== */

.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--mid-gray);
}

.empty-state__text {
  font-size: var(--text-sm);
  margin-bottom: var(--space-md);
}

.loading {
  opacity: 0.5;
  pointer-events: none;
}


/* ==============================================
   KEYFRAME ANIMATIONS
   ============================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}


/* ==============================================
   RESPONSIVE — MOBILE
   ============================================== */

@media (max-width: 600px) {
  .app {
    padding: var(--space-md);
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .header__right {
    width: 100%;
  }

  .mode-toggle {
    width: 100%;
  }

  .mode-toggle__btn {
    flex: 1;
    width: auto;
  }

  .audio-source {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
    padding: var(--space-md);
  }

  .audio-source__emulation,
  .audio-source__hardware {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
  }

  .audio-source__group {
    width: 100%;
  }

  .audio-source__samples {
    width: 100%;
  }

  .audio-source__controls {
    width: 100%;
    justify-content: center;
  }

  .btn--mod {
    flex: 1;
  }

  .sample-btn {
    flex: 1;
  }

  .play-btn {
    width: 100%;
    justify-content: center;
  }

  .preset-slots {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .preset-slot__clear {
    opacity: 1;
  }

  .preset-meta {
    grid-template-columns: 1fr;
  }

  .effect-card__params {
    grid-template-columns: 1fr;
  }

  .effect-card__delete {
    opacity: 1;
  }

  .mod-controls {
    flex-direction: column;
  }

  .form-group--inline {
    flex-direction: column;
    align-items: flex-start;
  }

  .form-group--inline label {
    min-width: auto;
  }

  .input--small {
    width: 100%;
  }

  .select {
    width: 100%;
  }

  .modal__content {
    width: 95%;
    border-radius: var(--radius-md);
  }

  .modal__content--help {
    max-width: 100%;
    max-height: 100%;
    width: 100%;
    height: 100%;
    border-radius: 0;
  }

  #helpModal.modal--open {
    padding: 0;
  }

  .connection-status {
    justify-content: center;
  }

  .btn--connect {
    width: 100%;
  }

  .toast {
    left: var(--space-md);
    right: var(--space-md);
    bottom: var(--space-md);
  }

  /* Reduce motion on mobile for performance */
  .app > * {
    animation-duration: 0.3s !important;
  }
}


/* ==============================================
   REDUCED MOTION — accessibility
   ============================================== */

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