/* TTS Studio — marketing site */
:root {
  --bg: #0a0c10;
  --bg-elevated: #12151c;
  --surface: #181c26;
  --surface-hover: #1e2430;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f0f2f7;
  --muted: #94a0b8;
  --accent: #5b8cff;
  --accent-2: #3dd6c5;
  --accent-glow: rgba(91, 140, 255, 0.45);
  --success: #3dd68c;
  --radius: 14px;
  --radius-lg: 20px;
  --max: 1120px;
  --header-h: 64px;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 140, 255, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(61, 214, 197, 0.08), transparent);
  pointer-events: none;
  z-index: -1;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #8eb0ff; }

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

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.site-header.scrolled {
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.site-header-inner,
.page-wrap,
.site-footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: block;
  object-fit: cover;
  flex-shrink: 0;
}

.nav { display: flex; align-items: center; gap: 0.25rem; }
.nav a {
  color: var(--muted);
  font-size: 0.92rem;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.nav a:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); text-decoration: none; }
.nav a.active { color: var(--text); background: rgba(91, 140, 255, 0.12); }

.nav-cta {
  margin-left: 0.5rem;
  padding: 0.45rem 1rem !important;
  background: var(--accent) !important;
  color: #fff !important;
  font-weight: 600;
}
.nav-cta:hover { filter: brightness(1.1); background: var(--accent) !important; }

.nav-studio {
  margin-left: 0.25rem;
  padding: 0.45rem 1rem !important;
  background: linear-gradient(135deg, rgba(91,140,255,0.18), rgba(61,214,197,0.14)) !important;
  border: 1px solid rgba(91,140,255,0.35) !important;
  color: var(--accent-2) !important;
  font-weight: 700;
  border-radius: 8px;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.nav-studio:hover {
  background: linear-gradient(135deg, rgba(91,140,255,0.28), rgba(61,214,197,0.22)) !important;
  border-color: var(--accent-2) !important;
  color: #fff !important;
  text-decoration: none;
}

/* Studio CTA button */
.btn-studio {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  background: linear-gradient(135deg, var(--accent-2), #29b8a8);
  color: #0a0c10;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  box-shadow: 0 8px 28px rgba(61,214,197,0.3);
}
.btn-studio:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(61,214,197,0.42);
  filter: brightness(1.06);
  color: #0a0c10;
  text-decoration: none;
}
.btn-studio-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

/* Studio band */
.studio-band {
  padding: 0 0 3rem;
}
.studio-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: linear-gradient(135deg, rgba(61,214,197,0.08) 0%, rgba(91,140,255,0.08) 100%);
  border: 1px solid rgba(61,214,197,0.2);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  flex-wrap: wrap;
}
.studio-band-copy h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  letter-spacing: -0.02em;
}
.studio-band-copy p {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
  max-width: 36rem;
}
@media (max-width: 640px) {
  .studio-band-inner { flex-direction: column; text-align: center; }
  .studio-band-copy p { max-width: 100%; }
}

/* Layout */
.page-wrap { padding-top: var(--header-h); }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  line-height: 1.25;
}

.section-lead {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
  margin: 0 0 1.5rem;
}

/* Hero */
.hero {
  position: relative;
  padding: 4rem 0 5rem;
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 3rem;
  align-items: center;
  width: 100%;
}

.hero-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  animation: fadeUp 0.7s ease both;
}

.hero-app-logo {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  display: block;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow:
    0 16px 48px rgba(45, 212, 191, 0.22),
    0 0 0 1px rgba(255, 255, 255, 0.08);
  animation: float 6s ease-in-out infinite;
}

.hero-brand-name {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
  animation: fadeUp 0.7s ease both;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 12px var(--success);
  animation: pulse 2s ease infinite;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.04em;
  margin: 0 0 1.25rem;
  animation: fadeUp 0.7s 0.1s ease both;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, #fff 30%, var(--accent) 70%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .lead {
  font-size: 1.125rem;
  color: var(--muted);
  max-width: 32rem;
  margin: 0 0 2rem;
  animation: fadeUp 0.7s 0.2s ease both;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  animation: fadeUp 0.7s 0.4s ease both;
}

.hero-stat strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
}

.hero-stat span { font-size: 0.85rem; color: var(--muted); }

.btn-row {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  animation: fadeUp 0.7s 0.3s ease both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.4rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  cursor: pointer;
}

.btn:hover { transform: translateY(-2px); text-decoration: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #4a6fd9);
  color: #fff;
  box-shadow: 0 8px 28px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 12px 36px var(--accent-glow); filter: brightness(1.05); }

.btn-secondary {
  border-color: var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}
.btn-secondary:hover { border-color: rgba(91, 140, 255, 0.4); background: rgba(255, 255, 255, 0.07); }

/* Screenshot frame */
.hero-visual {
  position: relative;
  animation: fadeUp 0.9s 0.25s ease both, float 6s ease-in-out 1s infinite;
}

.hero-glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  filter: blur(40px);
  opacity: 0.5;
  z-index: 0;
  animation: glowPulse 4s ease-in-out infinite;
}

.screenshot-frame {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow:
    0 24px 80px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  background: var(--surface);
}

.screenshot-frame::before {
  content: "";
  display: block;
  height: 32px;
  background: linear-gradient(180deg, #252a36, #1a1e28);
  border-bottom: 1px solid var(--border);
}

.screenshot-dots {
  position: absolute;
  top: 10px;
  left: 14px;
  display: flex;
  gap: 6px;
  z-index: 2;
}

.screenshot-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #3a4050;
}
.screenshot-dots span:nth-child(1) { background: #ff5f57; }
.screenshot-dots span:nth-child(2) { background: #febc2e; }
.screenshot-dots span:nth-child(3) { background: #28c840; }

.screenshot-frame img {
  width: 100%;
  vertical-align: top;
}

.zoomable-img {
  cursor: zoom-in;
  transition: filter 0.2s ease;
}

.zoomable-img:hover {
  filter: brightness(1.06);
}

.guide-screenshot img {
  width: 100%;
  display: block;
}

/* Lightbox */
body.lightbox-open {
  overflow: hidden;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem;
  background: rgba(6, 8, 14, 0.94);
  backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  max-width: min(1200px, 96vw);
  max-height: 92vh;
}

.lightbox-image {
  max-width: 100%;
  max-height: calc(92vh - 3rem);
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.65);
  animation: lightboxIn 0.28s ease both;
}

.lightbox-caption {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  max-width: 42rem;
  line-height: 1.5;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
  transition: background 0.2s, transform 0.2s;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: scale(1.05);
}

@keyframes lightboxIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

/* Feature rows */
.section { padding: 5rem 0; }

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
  margin-bottom: 5rem;
}

.feature-row:last-child { margin-bottom: 0; }
.feature-row.reverse .feature-copy { order: 2; }
.feature-row.reverse .feature-visual { order: 1; }

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.feature-list li {
  position: relative;
  padding-left: 1.5rem;
  margin: 0.65rem 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 700;
}

.feature-visual .screenshot-frame {
  animation: float 7s ease-in-out infinite;
}

.feature-row:nth-child(even) .feature-visual .screenshot-frame {
  animation-delay: -3s;
}

/* Cards grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(91, 140, 255, 0.25);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.card h3 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.55; }
.card a.card-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 600;
}

/* Pricing / CTA */
.pricing-band {
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.08), rgba(61, 214, 197, 0.06));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
}

.callout {
  background: rgba(91, 140, 255, 0.1);
  border: 1px solid rgba(91, 140, 255, 0.2);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.cta-section {
  text-align: center;
  padding: 5rem 0 6rem;
}

.cta-section .section-title { max-width: 28rem; margin-left: auto; margin-right: auto; }
.cta-section .section-lead { margin-left: auto; margin-right: auto; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--text); text-decoration: none; }

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* Support page */
.support-page .section-lead { max-width: 40rem; }

.support-channel-list {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.support-channel-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.support-channel-card:hover {
  border-color: rgba(91, 140, 255, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.support-channel-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(91, 140, 255, 0.1);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
}

.support-channel-body h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.support-channel-body p {
  margin: 0 0 1rem;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.95rem;
}

.support-channel-cta {
  display: inline-flex;
}

.support-back {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.support-back a { font-weight: 600; }

@media (max-width: 600px) {
  .support-channel-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .support-channel-icon { margin: 0 auto; }
}

/* Guide pages */
.guide-content { padding: 3rem 0 4rem; }
.guide-content h1 { font-size: 2rem; letter-spacing: -0.03em; }
.guide-content h2 { margin-top: 2.5rem; font-size: 1.25rem; }
.guide-content h3 { margin-top: 1.5rem; }
.guide-content ol, .guide-content ul { padding-left: 1.25rem; }
.guide-content li { margin: 0.45rem 0; color: var(--muted); }
.guide-content code {
  background: rgba(91, 140, 255, 0.12);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--accent-2);
}

.guide-screenshot {
  margin: 2rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
  position: relative;
}

.screenshot-frame:has(.zoomable-img)::after,
.guide-screenshot:has(.zoomable-img)::after {
  content: "Phóng to";
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.screenshot-frame:has(.zoomable-img):hover::after,
.guide-screenshot:has(.zoomable-img):hover::after {
  opacity: 1;
}

.guide-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.92); }
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.65; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-visual, .screenshot-frame, .hero-badge-dot, .hero-app-logo { animation: none !important; }
  .lightbox-image { animation: none; }
  .btn:hover { transform: none; }
}

@media (max-width: 900px) {
  .hero-grid,
  .feature-row {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .feature-row.reverse .feature-copy,
  .feature-row.reverse .feature-visual { order: unset; }
  .grid-3 { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding: 3rem 0 4rem; }
  .hero-visual { max-width: 520px; margin: 0 auto; }
}

@media (max-width: 600px) {
  .nav a:not(.nav-cta) { display: none; }
  .hero-stats { flex-direction: column; gap: 1rem; }
}