/* ============================================================
   Audio Online — Studio Dark Theme
   ============================================================ */

:root {
  /* Studio surfaces */
  --void: #0a0a0f;
  --carbon: #12121b;
  --slate: #1c1c29;
  --slate-soft: #262636;

  /* Signal accents */
  --amber: #f5a524;
  --amber-deep: #c47f12;
  --electric: #4cc9f0;
  --violet: #7b5cff;
  --lime: #7ee787;

  /* Text */
  --paper: #f2f2f7;
  --paper-soft: #c9c9d6;
  --mute: #8a8a9e;

  /* Typography */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--paper);
  background: var(--void);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--electric);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--amber);
}

strong {
  color: var(--paper);
  font-weight: 600;
}

.container {
  width: min(1120px, 100% - 2.5rem);
  margin-inline: auto;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: var(--space-xl) 0 var(--space-lg);
  background:
    radial-gradient(ellipse 60% 50% at 20% 0%, rgba(123, 92, 255, 0.28), transparent 70%),
    radial-gradient(ellipse 50% 50% at 85% 20%, rgba(76, 201, 240, 0.20), transparent 70%),
    var(--void);
  overflow: hidden;
}

/* Grid lines — mixing-console feel */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 100%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  width: min(1120px, 100% - 2.5rem);
  margin-inline: auto;
}

.hero__eyebrow {
  font-family: var(--font-display);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--amber);
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  line-height: 1.02;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.hero__highlight {
  background: linear-gradient(100deg, var(--amber) 10%, var(--electric) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  max-width: 46ch;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--paper-soft);
  margin-bottom: var(--space-md);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.btn {
  display: inline-block;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.btn--primary {
  background: linear-gradient(100deg, var(--amber), var(--amber-deep));
  color: var(--void);
  box-shadow: 0 8px 30px rgba(245, 165, 36, 0.25);
}

.btn--ghost {
  border: 1px solid var(--slate-soft);
  color: var(--paper);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary:hover {
  color: var(--void);
}

.btn--ghost:hover {
  border-color: var(--electric);
  color: var(--electric);
}

/* Equalizer decoration */
.hero__eq {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 72px;
}

.hero__eq span {
  width: 6px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--electric), var(--violet));
  animation: eq 1.4s var(--ease-out) infinite alternate;
  opacity: 0.75;
}

@keyframes eq {
  from { height: 12%; }
  to   { height: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__eq span { animation: none; height: 55%; }
  html { scroll-behavior: auto; }
}

/* ---- Sections ---- */
.section {
  padding: var(--space-xl) 0;
  position: relative;
}

.section--alt {
  background: var(--carbon);
}

.section__header {
  max-width: 62ch;
  margin-bottom: var(--space-lg);
}

.section__tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
  border: 1px solid rgba(245, 165, 36, 0.3);
  border-radius: 999px;
  padding: 0.25rem 0.85rem;
  margin-bottom: var(--space-sm);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-xs);
}

.section__desc {
  color: var(--mute);
}

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.card {
  background: var(--slate);
  border: 1px solid var(--slate-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: transform 0.3s var(--ease-out), border-color 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(76, 201, 240, 0.45);
}

.card__icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
}

.card p {
  color: var(--paper-soft);
  font-size: 0.97rem;
}

/* ---- Data table ---- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--slate-soft);
  border-radius: var(--radius-lg);
  background: var(--slate);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

.data-table th,
.data-table td {
  padding: 0.95rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--slate-soft);
}

.data-table thead th {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
  background: var(--carbon);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover {
  background: rgba(76, 201, 240, 0.05);
}

.data-table td {
  color: var(--paper-soft);
  font-size: 0.95rem;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  white-space: nowrap;
}

.badge--best { background: rgba(126, 231, 135, 0.14); color: var(--lime); }
.badge--good { background: rgba(76, 201, 240, 0.14); color: var(--electric); }
.badge--ok   { background: rgba(245, 165, 36, 0.14); color: var(--amber); }

/* ---- Bitrate meters ---- */
.meter-list {
  display: grid;
  gap: var(--space-sm);
  max-width: 760px;
}

.meter {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  align-items: center;
  gap: var(--space-sm);
}

.meter__label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--paper);
}

.meter__track {
  height: 10px;
  border-radius: 999px;
  background: var(--slate-soft);
  overflow: hidden;
}

.meter__fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--violet), var(--electric));
  transition: width 1.1s var(--ease-out);
}

.meter__value {
  font-size: 0.85rem;
  color: var(--mute);
  min-width: 96px;
  text-align: right;
}

/* ---- Platform grid ---- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
}

.platform {
  background: var(--slate);
  border: 1px solid var(--slate-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.platform__name {
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.platform__spec {
  font-size: 0.82rem;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.platform p {
  color: var(--paper-soft);
  font-size: 0.94rem;
}

.platform__list {
  list-style: none;
  margin-top: auto;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--slate-soft);
  font-size: 0.9rem;
  color: var(--mute);
}

.platform__list li::before {
  content: '▸ ';
  color: var(--electric);
}

/* ---- Steps ---- */
.steps {
  counter-reset: step;
  display: grid;
  gap: var(--space-md);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.step {
  position: relative;
  padding-left: 3.4rem;
}

.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--amber);
}

.step__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.step p {
  color: var(--paper-soft);
  font-size: 0.94rem;
}

/* ---- FAQ ---- */
.faq-list {
  display: grid;
  gap: var(--space-sm);
  max-width: 860px;
}

.faq-item {
  background: var(--slate);
  border: 1px solid var(--slate-soft);
  border-radius: var(--radius-md);
  padding: 0 var(--space-md);
}

.faq-item__q {
  cursor: pointer;
  list-style: none;
  padding: 1.1rem 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
}

.faq-item__q::-webkit-details-marker {
  display: none;
}

.faq-item__q::after {
  content: '+';
  color: var(--amber);
  font-size: 1.3rem;
  line-height: 1;
  transition: transform 0.25s var(--ease-out);
}

.faq-item[open] .faq-item__q::after {
  transform: rotate(45deg);
}

.faq-item__a {
  padding-bottom: 1.1rem;
  color: var(--paper-soft);
  font-size: 0.95rem;
}

/* ---- Reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---- Footer ---- */
.footer {
  background: var(--carbon);
  border-top: 1px solid var(--slate-soft);
  padding: var(--space-lg) 0 var(--space-md);
}

.footer__inner {
  width: min(1120px, 100% - 2.5rem);
  margin-inline: auto;
  display: grid;
  gap: var(--space-md);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
}

.footer__logo span {
  color: var(--amber);
}

.footer__tagline {
  color: var(--mute);
  font-size: 0.94rem;
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  font-size: 0.94rem;
}

.footer__nav a {
  color: var(--paper-soft);
}

.footer__copy {
  color: var(--mute);
  font-size: 0.85rem;
  border-top: 1px solid var(--slate-soft);
  padding-top: var(--space-sm);
}

/* ---- Responsive ---- */
@media (max-width: 720px) {
  .section { padding: var(--space-lg) 0; }
  .hero { min-height: auto; padding-top: var(--space-lg); }

  .meter {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .meter__value { text-align: left; }

  /* Stacked table rows */
  .table-wrap { overflow-x: visible; }
  .data-table { min-width: 0; }
  .data-table thead { display: none; }
  .data-table,
  .data-table tbody,
  .data-table tr,
  .data-table td { display: block; width: 100%; }

  .data-table tr {
    border-bottom: 1px solid var(--slate-soft);
    padding: var(--space-xs) 0;
  }

  .data-table td {
    border: none;
    display: flex;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: 0.4rem 1rem;
  }

  .data-table td::before {
    content: attr(data-label);
    color: var(--mute);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
}