/* ═══════════════════════════════════════════════════
   VoiceQR — Design System
   ═══════════════════════════════════════════════════ */

/* ── Design tokens ─────────────────────────────── */
:root {
  --clr-bg:          #0a0a12;
  --clr-surface:     #12121e;
  --clr-surface2:    #1a1a2e;
  --clr-border:      rgba(255,255,255,0.07);

  --clr-purple:      #7c3aed;
  --clr-violet:      #a78bfa;
  --clr-blue:        #2563eb;
  --clr-cyan:        #06b6d4;
  --clr-pink:        #ec4899;

  --grad-primary:    linear-gradient(135deg, var(--clr-purple), var(--clr-cyan));
  --grad-accent:     linear-gradient(135deg, #7c3aed 0%, #2563eb 50%, #06b6d4 100%);

  --clr-text:        #f1f5f9;
  --clr-text-muted:  #94a3b8;

  --radius-sm:       8px;
  --radius-md:       16px;
  --radius-lg:       24px;
  --radius-xl:       32px;

  --shadow-card:     0 8px 48px rgba(0,0,0,0.55);
  --shadow-glow:     0 0 40px rgba(124,58,237,0.35);

  --font-sans:       'Inter', system-ui, -apple-system, sans-serif;

  --transition:      0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
[hidden] { display: none !important; }

body {
  font-family:     var(--font-sans);
  background-color: var(--clr-bg);
  color:           var(--clr-text);
  min-height:      100vh;
  overflow-x:      hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--clr-violet); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Background animated blobs ─────────────────── */
.bg-blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
  animation: floatBlob 20s ease-in-out infinite alternate;
}
.blob-1 { width: 600px; height: 600px; background: var(--clr-purple); top: -200px; left: -200px; animation-delay: 0s; }
.blob-2 { width: 500px; height: 500px; background: var(--clr-blue);   bottom: -150px; right: -150px; animation-delay: -7s; }
.blob-3 { width: 400px; height: 400px; background: var(--clr-cyan);   top: 40%;  right: 15%; animation-delay: -13s; }

@keyframes floatBlob {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(40px, 30px) scale(1.08); }
}

/* ── App shell ──────────────────────────────────── */
.app-shell {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* ── Header ─────────────────────────────────────── */
.app-header { text-align: center; }

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.logo-icon { font-size: 2rem; }
.logo-text {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.tagline {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  max-width: 420px;
  margin: 0 auto;
}

/* ── Feature pills ─────────────────────────────── */
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}
.pill {
  background: var(--clr-surface2);
  border: 1px solid var(--clr-border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  white-space: nowrap;
}

/* ── Cards ─────────────────────────────────────── */
.card {
  background:    var(--clr-surface);
  border:        1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding:       2rem 1.75rem;
  box-shadow:    var(--shadow-card);
  backdrop-filter: blur(12px);
  text-align: center;
}

/* ── Record card ────────────────────────────────── */
.record-card { position: relative; overflow: hidden; }
.record-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(124,58,237,0.06), rgba(6,182,212,0.04));
  pointer-events: none;
}

/* ── Countdown ──────────────────────────────────── */
.countdown {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  display: block;
}
.countdown.pop {
  animation: popIn 0.35s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes popIn {
  0%   { transform: scale(0.5); opacity: 0; }
  100% { transform: scale(1);   opacity: 1; }
}

/* ── Waveform canvas ────────────────────────────── */
.wave-canvas {
  width: 100%;
  max-width: 480px;
  height: 80px;
  margin: 0 auto 1.25rem;
  display: block;
  border-radius: var(--radius-sm);
  background: rgba(124,58,237,0.08);
  border: 1px solid rgba(124,58,237,0.2);
}

/* ── Record button ──────────────────────────────── */
.record-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1rem 2.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-sans);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 24px rgba(124,58,237,0.45);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  position: relative;
  overflow: hidden;
  margin: 0.5rem 0 1rem;
}
.record-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition);
}
.record-btn:hover:not(:disabled) {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 8px 32px rgba(124,58,237,0.6);
}
.record-btn:active:not(:disabled) { transform: scale(0.97); }
.record-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}
.record-btn.recording {
  background: linear-gradient(135deg, #dc2626, #f97316);
  box-shadow: 0 4px 24px rgba(220,38,38,0.5);
  animation: recordPulse 1.4s ease-in-out infinite;
}
.record-btn.processing {
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-cyan));
}

@keyframes recordPulse {
  0%, 100% { box-shadow: 0 4px 24px rgba(220,38,38,0.5); }
  50%       { box-shadow: 0 4px 36px rgba(220,38,38,0.9); }
}

.btn-icon { font-size: 1.2rem; }

/* Animated pulse ring during recording */
.pulse-ring {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: #fff;
  position: relative;
}
.pulse-ring::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid #fff;
  animation: ringPulse 1s ease-out infinite;
}
@keyframes ringPulse {
  0%   { transform: scale(1);   opacity: 0.7; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* ── Status text ─────────────────────────────────── */
.status-text {
  color: var(--clr-text-muted);
  font-size: 0.9rem;
  min-height: 1.4em;
}
.status-text::after {
  content: attr(data-sub);
  display: block;
  font-size: 0.78rem;
  opacity: 0.65;
  margin-top: 0.15rem;
}

/* ── Progress bar ───────────────────────────────── */
.progress-wrap {
  width: 100%;
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 1rem;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--grad-accent);
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* ── Result card ─────────────────────────────────── */
.result-card { animation: fadeUp 0.4s ease; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* QR frame with glow */
.qr-frame {
  position: relative;
  display: inline-block;
  margin-bottom: 0.75rem;
}
.qr-image {
  display: block;
  width: 260px;
  height: 260px;
  border-radius: var(--radius-md);
  border: 2px solid rgba(124,58,237,0.3);
  background: #fff;
}
.qr-glow {
  position: absolute;
  inset: -8px;
  border-radius: var(--radius-lg);
  background: var(--grad-accent);
  filter: blur(16px);
  opacity: 0.35;
  z-index: -1;
  animation: glowPulse 3s ease-in-out infinite alternate;
}
@keyframes glowPulse {
  0%   { opacity: 0.25; }
  100% { opacity: 0.5; }
}

.qr-size-label {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  margin-bottom: 1.25rem;
  font-variant-numeric: tabular-nums;
}

/* ── Action buttons ─────────────────────────────── */
.result-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.action-btn {
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border: 1px solid var(--clr-border);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.action-btn:hover { transform: translateY(-1px); }
.action-btn:active { transform: scale(0.97); }

.preview-btn  { background: rgba(124,58,237,0.2); color: var(--clr-violet); border-color: rgba(124,58,237,0.35); }
.download-btn { background: rgba(6,182,212,0.15);  color: var(--clr-cyan);   border-color: rgba(6,182,212,0.3); }
.share-btn    { background: rgba(236,72,153,0.15); color: var(--clr-pink);  border-color: rgba(236,72,153,0.3); }

.preview-btn:hover  { background: rgba(124,58,237,0.35); box-shadow: 0 4px 16px rgba(124,58,237,0.3); }
.download-btn:hover { background: rgba(6,182,212,0.3);   box-shadow: 0 4px 16px rgba(6,182,212,0.3); }
.share-btn:hover    { background: rgba(236,72,153,0.3);  box-shadow: 0 4px 16px rgba(236,72,153,0.3); }

.retry-btn {
  background: none;
  border: 1px solid var(--clr-border);
  border-radius: 999px;
  color: var(--clr-text-muted);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  padding: 0.5rem 1.25rem;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}
.retry-btn:hover { color: var(--clr-text); border-color: rgba(255,255,255,0.2); }

/* ── How-to collapsible ──────────────────────────── */
.howto {
  margin-top: 1.25rem;
  text-align: left;
  border-top: 1px solid var(--clr-border);
  padding-top: 1rem;
}
.howto summary {
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.howto summary::before { content: '▶'; font-size: 0.65rem; transition: transform 0.2s; }
.howto[open] summary::before { transform: rotate(90deg); }
.howto-body { margin-top: 0.75rem; display: flex; flex-direction: column; gap: 0.75rem; }
.howto-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  line-height: 1.55;
}
.howto-num {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Use-case section ───────────────────────────── */
.usecases { text-align: center; }

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.78rem;
  margin-bottom: 1rem;
}

.usecase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.usecase-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.usecase-card:hover {
  transform: translateY(-3px);
  border-color: rgba(124,58,237,0.35);
  box-shadow: 0 6px 24px rgba(124,58,237,0.15);
}
.usecase-icon { font-size: 1.75rem; margin-bottom: 0.5rem; }
.usecase-label {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.usecase-card p {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
}

/* ── Footer ─────────────────────────────────────── */
.app-footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--clr-text-muted);
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 480px) {
  .app-shell { padding: 1.5rem 1rem 3rem; }
  .logo-text  { font-size: 1.5rem; }
  .record-btn { font-size: 1rem; padding: 0.9rem 2rem; }
  .usecase-grid { grid-template-columns: 1fr; }
  .qr-image { width: 220px; height: 220px; }
}