/* ==========================================================================
   STUDIO VOCE — STYLESHEET (CANONE VISIVO EMAF205 / SWISS PUNK BOLD)
   Warm Paper: #f7f7f3 | Ink: #0b0b0b | Acid Fluo: #e8ff00 | White: #ffffff
   Borders: 2.5px solid #000000 | Offset Shadows: 4px 4px 0px #000000
   Zero tiny text (all >= 16px) | Tabular figures on numbers
   ========================================================================== */

:root {
  --paper: #f7f7f3;
  --ink: #0b0b0b;
  --white: #ffffff;
  --acid: #e8ff00;
  --acid-hover: #d7ee00;
  --gray-light: #ecece6;
  --gray-mid: #cfcfc6;
  --gray-dark: #707068;
  --border-black: #000000;
  --border-width: 2.5px;
  --shadow-base: 4px 4px 0px #000000;
  --shadow-hover: 7px 7px 0px #000000;
  --shadow-active: 1px 1px 0px #000000;
  --font-display: 'Zalando Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

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

html {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.5;
  font-weight: 600;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background-color: var(--paper);
  color: var(--ink);
}

.shell {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- HEADER --- */
.app-header {
  padding: 32px 0 24px;
  border-bottom: var(--border-width) solid var(--border-black);
  background: var(--paper);
}

.header-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 768px) {
  .header-inner {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.brand-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.brand-badge {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  background: var(--ink);
  color: var(--acid);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
}

.brand-title {
  font-size: clamp(2.4rem, 1.8rem + 2.5vw, 4rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.brand-sub {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  max-width: 64ch;
}

.brand-sub strong {
  background: var(--acid);
  padding: 2px 6px;
  border: 1.5px solid var(--border-black);
}

.header-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill-badge {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  padding: 6px 12px;
  background: var(--white);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  letter-spacing: 0.04em;
}

.pill-neon {
  background: var(--acid);
}

/* --- MAIN & GRIDS --- */
.app-main {
  flex: 1;
  padding: 40px 0 60px;
}

.main-grid {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

/* --- CARD CONTAINERS --- */
.card {
  background: var(--white);
  border: var(--border-width) solid var(--border-black);
  box-shadow: var(--shadow-base);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}

@media (min-width: 768px) {
  .card {
    padding: 36px;
  }
}

.card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  border-bottom: var(--border-width) solid var(--border-black);
  padding-bottom: 16px;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 900;
  background: var(--acid);
  color: var(--ink);
  padding: 4px 10px;
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
}

.card-title {
  font-size: clamp(1.4rem, 1.2rem + 1vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

/* --- SEZIONE 1: DROPZONE --- */
.dropzone {
  border: 3px dashed var(--border-black);
  background: var(--paper);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.dropzone:hover,
.dropzone:focus-visible {
  background: #fdfde9;
  border-color: var(--border-black);
  outline: none;
}

.dropzone.dragover {
  background: #f2ff6b;
  border-style: solid;
  transform: scale(1.01);
}

.dropzone.has-file {
  border-color: var(--border-black);
  background: #eefee8;
}

.drop-icon {
  color: var(--ink);
  margin-bottom: 4px;
}

.drop-text {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.drop-sub {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-dark);
}

.btn-link {
  background: none;
  border: none;
  font: inherit;
  font-weight: 800;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
  cursor: pointer;
}

.btn-link:hover {
  background: var(--acid);
}

.drop-formats {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-dark);
  letter-spacing: 0.05em;
  background: var(--white);
  padding: 4px 10px;
  border: 1.5px solid var(--border-black);
}

/* File info badge */
.file-info-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--gray-light);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  padding: 16px 20px;
  gap: 16px;
}

.file-info-left {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow: hidden;
}

.audio-icon-badge {
  background: var(--acid);
  border: var(--border-width) solid var(--border-black);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-name {
  font-size: 18px;
  font-weight: 800;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}

.file-meta {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-dark);
  font-feature-settings: "tnum";
}

.btn-icon {
  background: var(--white);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: transform 0.1s, box-shadow 0.1s;
}

.btn-icon:hover {
  background: #ffdede;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--border-black);
}

.quick-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 600px) {
  .quick-actions {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- SEZIONE 2: SLIDER & TOGGLE --- */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--paper);
  border: var(--border-width) solid var(--border-black);
  padding: 20px;
  box-shadow: 2px 2px 0px var(--border-black);
}

.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.slider-label {
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.slider-val {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 900;
  font-feature-settings: "tnum";
  background: var(--acid);
  padding: 2px 10px;
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
}

.custom-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 18px;
  background: var(--white);
  border: var(--border-width) solid var(--border-black);
  outline: none;
  margin: 8px 0;
  cursor: pointer;
}

.custom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  background: var(--ink);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--acid);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.custom-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: var(--acid);
  border-color: var(--border-black);
}

.custom-slider::-moz-range-thumb {
  width: 32px;
  height: 32px;
  background: var(--ink);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--acid);
  cursor: pointer;
}

.slider-desc {
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-dark);
}

/* Toggles List */
.toggles-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  background: var(--paper);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  cursor: pointer;
  user-select: none;
  gap: 20px;
  transition: transform 0.1s, box-shadow 0.1s;
}

.toggle-row:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--border-black);
}

.toggle-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toggle-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.toggle-desc {
  font-size: 15px;
  font-weight: 550;
  color: var(--gray-dark);
}

/* Switch Input */
.switch-container {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
  flex-shrink: 0;
}

.switch-input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--gray-mid);
  border: var(--border-width) solid var(--border-black);
  transition: background-color 0.2s;
  box-shadow: inset 1px 1px 0px rgba(0,0,0,0.2);
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3.5px;
  background-color: var(--ink);
  border: 1.5px solid var(--border-black);
  transition: transform 0.2s;
}

.switch-input:checked + .switch-slider {
  background-color: var(--acid);
}

.switch-input:checked + .switch-slider::before {
  transform: translateX(25px);
  background-color: var(--ink);
}

/* --- BOTTONI GLOBALI --- */
.btn {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  padding: 16px 28px;
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  border: var(--border-width) solid var(--border-black);
  box-shadow: var(--shadow-base);
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.15s ease;
  user-select: none;
  text-decoration: none;
}

.btn:hover:not(:disabled) {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.btn:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: 2px 2px 0px var(--border-black);
  transform: none;
}

.btn-primary {
  background: var(--acid);
  color: var(--ink);
}

.btn-primary:hover:not(:disabled) {
  background: var(--acid-hover);
}

.btn-secondary {
  background: var(--white);
  color: var(--ink);
}

.btn-secondary.recording {
  background: #ff4747;
  color: var(--white);
}

.rec-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ffffff;
  display: inline-block;
  animation: pulseRec 1s infinite alternate;
}

@keyframes pulseRec {
  from { opacity: 0.4; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1.15); }
}

.btn-block {
  width: 100%;
}

.btn-download {
  background: var(--ink);
  color: var(--acid);
  font-size: 20px;
}

.btn-download:hover:not(:disabled) {
  background: #202020;
}

/* Progress Bar */
.action-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 8px;
}

.progress-box {
  background: var(--paper);
  border: var(--border-width) solid var(--border-black);
  padding: 16px;
  box-shadow: 2px 2px 0px var(--border-black);
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}

.progress-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.progress-percent {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 900;
  font-feature-settings: "tnum";
}

.progress-track {
  height: 18px;
  background: var(--white);
  border: var(--border-width) solid var(--border-black);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--acid);
  transition: width 0.2s ease;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-black);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- SEZIONE 3: PLAYER A/B --- */
.player-card {
  border-color: var(--border-black);
}

.player-header {
  justify-content: space-between;
}

.mode-badge {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 900;
  padding: 6px 12px;
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  letter-spacing: 0.05em;
}

.badge-cleaned {
  background: var(--acid);
  color: var(--ink);
}

.badge-original {
  background: var(--gray-mid);
  color: var(--ink);
}

/* Switch A/B */
.ab-switch-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.ab-btn {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
  padding: 16px 14px;
  background: var(--gray-light);
  color: var(--gray-dark);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: transform 0.1s, background-color 0.15s, color 0.15s;
}

.ab-btn:hover {
  background: var(--white);
  color: var(--ink);
}

.ab-btn.active {
  background: var(--ink);
  color: var(--acid);
  box-shadow: var(--shadow-base);
  transform: translate(-1px, -1px);
}

.ab-indicator {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 900;
  padding: 2px 8px;
  background: var(--border-black);
  color: var(--white);
  border: 1.5px solid var(--border-black);
}

.ab-btn.active .ab-indicator {
  background: var(--acid);
  color: var(--ink);
}

.ab-hint {
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-dark);
  margin-top: -12px;
}

kbd {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  background: var(--white);
  border: 1.5px solid var(--border-black);
  padding: 1px 6px;
  box-shadow: 1px 1px 0px var(--border-black);
}

/* Waveform Canvas */
.waveform-container {
  position: relative;
  background: var(--paper);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 2px 2px 0px var(--border-black);
  overflow: hidden;
  height: 120px;
}

#waveformCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.timeline-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  cursor: pointer;
}

.timeline-progress {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 0%;
  background: rgba(232, 255, 0, 0.35);
  border-right: 3px solid var(--border-black);
  pointer-events: none;
}

/* Player Controls Bar */
.player-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--paper);
  border: var(--border-width) solid var(--border-black);
  padding: 16px 20px;
  box-shadow: 2px 2px 0px var(--border-black);
}

.btn-play {
  width: 54px;
  height: 54px;
  background: var(--acid);
  border: var(--border-width) solid var(--border-black);
  box-shadow: 3px 3px 0px var(--border-black);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  flex-shrink: 0;
}

.btn-play:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--border-black);
}

.btn-play:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--border-black);
}

.timecode {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.05em;
  font-feature-settings: "tnum";
}

.stats-pills {
  display: flex;
  gap: 12px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1.5px solid var(--border-black);
  padding: 4px 10px;
  box-shadow: 1.5px 1.5px 0px var(--border-black);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  color: var(--gray-dark);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 900;
  font-feature-settings: "tnum";
}

/* Download Section */
.download-action {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.download-note {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-dark);
  text-align: center;
}

/* --- FOOTER --- */
.app-footer {
  border-top: var(--border-width) solid var(--border-black);
  padding: 24px 0;
  background: var(--paper);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-copy {
  font-size: 15px;
  font-weight: 700;
}

.footer-copy a {
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 800;
}

.footer-tech {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-dark);
}