:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --text-primary: #f1f1f3;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border: #27272a;
  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

body.app {
  display: flex;
  align-items: center;
  justify-content: center;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 2rem;
}

body.landing .container {
  max-width: 1100px;
}

.container.app-container {
  max-width: 800px;
  padding: 2rem 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

header.app-header {
  margin-bottom: 2rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.language-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.language-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.language-group select {
  padding: 0.75rem 1rem;
  font-size: 1rem;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  min-width: 160px;
}

.language-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.arrow {
  font-size: 1.5rem;
  color: var(--accent);
}

.language-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.swap-btn {
  width: 40px;
  height: 40px;
  font-size: 1.25rem;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.swap-btn:hover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
}

.recording-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.record-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.record-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.02);
}

.record-btn.recording {
  background: var(--error);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.mic-icon {
  font-size: 1.5rem;
}

.status {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.audio-preview {
  margin-top: 0.5rem;
}

.audio-preview audio {
  width: 300px;
  height: 40px;
}

.transcript-section,
.translation-section {
  margin-bottom: 2rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.section-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.action-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.action-btn:hover {
  background: var(--accent-hover);
}

.action-btn:active {
  transform: scale(0.98);
}

.transcript-section h2,
.translation-section h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.text-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  min-height: 120px;
  font-size: 1.125rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  width: 100%;
}

textarea.text-box {
  resize: vertical;
  font-family: inherit;
}

textarea.text-box::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.translation-box:empty::before {
  content: attr(data-placeholder);
  color: var(--text-muted);
  font-style: italic;
}

.text-box .placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.transcript-box {
  border-left: 3px solid var(--accent);
}

.translation-box {
  border-left: 3px solid var(--success);
}

.speak-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.speak-btn:hover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
}

.speaker-icon {
  font-size: 1.125rem;
}

footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 100;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

#loadingText {
  color: var(--text-secondary);
  font-size: 1rem;
}

.hidden {
  display: none !important;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }

.nav-links { display: flex; gap: 2rem; align-items: center; }

.nav-links a { color: var(--text-secondary); font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text-primary); }

.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.hero {
  padding: 6rem 0 5rem;
  text-align: center;
  background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(99,102,241,0.15), transparent);
}

.hero-badge {
  display: inline-block;
  padding: 0.3rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  background: var(--bg-secondary);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero h1 span { color: var(--accent); }

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.section { padding: 5rem 0; }

.section-header { text-align: center; margin-bottom: 3rem; }

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-header p { color: var(--text-secondary); }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: border-color 0.2s;
}

.step-card:hover { border-color: var(--accent); }

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.step-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem; }
.step-card p { font-size: 0.875rem; color: var(--text-secondary); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.feature-icon { font-size: 1.75rem; margin-bottom: 1rem; }
.feature-card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.4rem; }
.feature-card p { font-size: 0.85rem; color: var(--text-secondary); }

.pricing-section { background: var(--bg-secondary); }

.pricing-table {
  max-width: 700px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.pricing-table table {
  width: 100%;
  border-collapse: collapse;
}

.pricing-table th {
  padding: 1rem 1.5rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
}

.pricing-table td {
  padding: 1rem 1.5rem;
  font-size: 0.95rem;
  border-bottom: 1px solid var(--border);
}

.pricing-table tr:last-child td { border-bottom: none; }
.pricing-table tr:hover td { background: rgba(99,102,241,0.04); }
.pricing-table .plan-name { font-weight: 600; }
.pricing-table .plan-free { color: var(--text-muted); font-size: 0.85rem; }

.pricing-table .top-up {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: rgba(99,102,241,0.15);
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
}

.pricing-table .highlight td { background: rgba(99,102,241,0.06); }

.pricing-cta { text-align: center; margin-top: 2rem; }

.faq { max-width: 700px; margin: 0 auto; }

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
}

.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-item h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.4rem; }
.faq-item p { font-size: 0.875rem; color: var(--text-secondary); }

footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a { color: var(--text-muted); }
footer a:hover { color: var(--accent); }

.logo { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 700; }

/* ── Auth/Login Card ── */

.auth-section {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3rem 2.5rem;
  width: 100%;
  max-width: 420px;
  text-align: center;
}

.auth-card .logo {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.auth-card .logo { display: block; line-height: 1; }

.auth-card h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.auth-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  line-height: 1.5;
}

.sso-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s;
  text-decoration: none;
  margin-bottom: 1.5rem;
}

.sso-btn:hover { background: var(--accent-hover); }

.mock-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.875rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  margin-bottom: 1.5rem;
}

.mock-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: var(--bg-card);
}

.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.register-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.register-link a { color: var(--accent); text-decoration: none; }
.register-link a:hover { color: var(--accent-hover); text-decoration: underline; }

.back-link {
  display: inline-block;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-decoration: none;
}

.back-link:hover { color: var(--text-secondary); }

body.landing .auth-card .back-link { margin-top: 1.5rem; }

@media (max-width: 480px) {
  .auth-card { padding: 2rem 1.5rem; }
  .auth-card h1 { font-size: 1.25rem; }
  body.landing .auth-section { padding: 2rem 1rem; }
}

@media (max-width: 768px) {
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { gap: 1.5rem; }
}

@media (max-width: 640px) {
  nav .container { flex-wrap: wrap; gap: 0.75rem; }
  .nav-links { gap: 1rem; }
  .nav-links a:not(.btn) { display: none; }
  .nav-links .btn { margin-left: auto; }
  .section-header h2 { font-size: 1.5rem; }
  .section-header p { font-size: 0.9rem; }
  .pricing-table-wrapper { overflow-x: auto; }
  .pricing-table { min-width: 420px; }
  .pricing-table th, .pricing-table td { padding: 0.75rem 1rem; white-space: nowrap; }
  .faq-item { padding: 1rem 0; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-buttons .btn { width: 100%; max-width: 280px; }
}

@media (max-width: 600px) {
  .container { padding: 0 1.25rem; }
  .nav-links { gap: 1rem; }
  .hero { padding: 4rem 0 3rem; }
  .section { padding: 3rem 0; }
  .pricing-table th, .pricing-table td { padding: 0.75rem 1rem; font-size: 0.85rem; }
}

@media (max-width: 480px) {
  .hero { padding: 3.5rem 0 2.5rem; }
  .section { padding: 2.5rem 0; }
  .section-header { margin-bottom: 2rem; }
  .section-header h2 { font-size: 1.35rem; }
  .steps-grid { gap: 1rem; }
  .step-card { padding: 1.5rem 1rem; }
  .features-grid { gap: 1rem; }
  .feature-card { padding: 1.25rem; }
  .pricing-table { min-width: 380px; }
  .pricing-table th { font-size: 0.7rem; }
  .pricing-table td { font-size: 0.85rem; padding: 0.65rem 0.75rem; }
  .faq-item h4 { font-size: 0.9rem; }
  .faq-item p { font-size: 0.825rem; }
  footer { padding: 2rem 0; }
}

@media (max-width: 360px) {
  .nav-logo { font-size: 1.1rem; }
  .hero h1 { font-size: 1.75rem; }
  .hero p { font-size: 0.9rem; }
  .pricing-table { min-width: 340px; }
  .pricing-table td { font-size: 0.8rem; padding: 0.6rem 0.6rem; }
}

@media (max-width: 600px) {
  .container.app-container {
    padding: 1.5rem 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .language-section {
    flex-direction: column;
    gap: 1rem;
  }

  .arrow {
    transform: rotate(90deg);
  }

  .text-box {
    font-size: 1rem;
    padding: 1rem;
  }

  .audio-preview audio {
    width: 100%;
  }
}

.credits-badge {
  background: var(--accent);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

.usage-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.usage-btn:hover {
  background: var(--bg-card);
  border-color: var(--accent);
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden { display: none; }

.modal-content {
  background: var(--bg-primary);
  border-radius: 16px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow: auto;
  border: 1px solid var(--border);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 { margin: 0; font-size: 1.25rem; }

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0;
  line-height: 1;
}

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

.usage-content {
  padding: 1.5rem;
}

.usage-balance {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 12px;
  margin-bottom: 1.5rem;
}

.balance-label { color: var(--text-secondary); }

.balance-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.usage-content h3 {
  margin: 0 0 1rem 0;
  font-size: 1rem;
  color: var(--text-secondary);
}

.transactions-list {
  max-height: 300px;
  overflow-y: auto;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.transaction-item:last-child { border-bottom: none; }

.transaction-desc { color: var(--text-primary); }

.transaction-amount {
  font-weight: 600;
}

.transaction-amount.positive { color: var(--success); }
.transaction-amount.negative { color: var(--error); }