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

:root {
  --black: #000000;
  --white: #ffffff;
  --gray-900: #111111;
  --gray-800: #1a1a1a;
  --gray-700: #2a2a2a;
  --gray-500: #888888;
  --gray-400: #aaaaaa;
  --gray-300: #cccccc;
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-hover: rgba(255, 255, 255, 0.08);
  --text-muted: rgba(255, 255, 255, 0.55);
  --letter-w: 110px;
  --letter-h: 150px;
  --letter-gap: 14px;
  --space-w: 44px;
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
  --section-gap: 2.75rem;
  --card-padding: 2.75rem;
  --font-display: 'Sora', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--white);
  background: var(--black);
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Background ───────────────────────────────────────────────── */
.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(1px 1px at 10% 20%, rgba(255, 255, 255, 0.6), transparent),
    radial-gradient(1px 1px at 30% 65%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 55% 15%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 70% 80%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1px 1px at 85% 35%, rgba(255, 255, 255, 0.45), transparent),
    radial-gradient(1px 1px at 15% 90%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 45% 45%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 92% 70%, rgba(255, 255, 255, 0.4), transparent),
    linear-gradient(180deg, var(--black) 0%, var(--gray-900) 100%);
  pointer-events: none;
}

.aurora {
  display: none;
}

/* ── Layout ───────────────────────────────────────────────────── */
.site-header,
.main-content,
.site-footer,
.footer {
  position: relative;
  z-index: 1;
}

.site-header {
  text-align: center;
  padding: 5.5rem 2rem 3.5rem;
  max-width: 720px;
  margin: 0 auto;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1.25rem;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: transparent;
  backdrop-filter: none;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--white);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  color: var(--white);
}

.title-accent {
  color: var(--white);
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  color: rgba(255, 255, 255, 0.55);
  max-width: 520px;
  margin: 0 auto;
  font-weight: 300;
  line-height: 1.85;
  letter-spacing: 0.01em;
}

.main-content {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 2rem 5rem;
  display: flex;
  flex-direction: column;
  gap: var(--section-gap);
}

/* ── Glass Cards ──────────────────────────────────────────────── */
.glass-card {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: var(--card-padding);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

/* ── Form & Controls ──────────────────────────────────────────── */
.name-form {
  margin-bottom: 2rem;
}

.input-row {
  display: flex;
  gap: 1rem;
}

.name-input {
  flex: 1;
  min-width: 0;
  padding: 1.05rem 1.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  color: var(--white);
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.name-input::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

.name-input:focus {
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

.input-hint {
  margin-top: 0.85rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.action-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  padding-top: 0.25rem;
}

.download-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none !important;
}

.btn:not(:disabled):hover {
  transform: translateY(-1px);
}

.btn-icon {
  font-size: 0.95rem;
  line-height: 1;
}

.btn-primary {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
  font-weight: 600;
}

.btn-primary:not(:disabled):hover {
  background: var(--gray-300);
  border-color: var(--gray-300);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

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

.btn-secondary:not(:disabled):hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-accent {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
  font-weight: 600;
}

.btn-accent:not(:disabled):hover {
  background: var(--gray-300);
  border-color: var(--gray-300);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.bg-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.bg-toggle input {
  accent-color: var(--white);
}

/* ── Display Area ─────────────────────────────────────────────── */
.display-card {
  min-height: 340px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.display-empty,
.display-loading,
.display-result {
  text-align: center;
}

.hidden {
  display: none !important;
}

.display-empty p,
.loading-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 1.5rem;
  letter-spacing: 0.01em;
  line-height: 1.7;
}

/* Loader */
.empty-orbit,
.loader-orbit {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto;
}

.orbit-ring,
.loader-ring {
  position: absolute;
  inset: 0;
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--white);
  border-radius: 50%;
}

.loader-ring {
  animation: spin 1.2s linear infinite;
}

.orbit-satellite,
.loader-satellite {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--white);
}

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

/* Skeleton loading — single straight line */
.skeleton-row {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  flex-wrap: nowrap;
  gap: var(--letter-gap);
  margin-top: 2rem;
  padding: 0.75rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.skeleton-tile {
  flex-shrink: 0;
  width: var(--letter-w);
  height: var(--letter-h);
  border-radius: var(--radius-sm);
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04) 25%,
    rgba(255, 255, 255, 0.12) 50%,
    rgba(255, 255, 255, 0.04) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Result */
.result-meta {
  margin-bottom: 2.25rem;
}

.result-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--white);
}

.result-subtitle {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 0.65rem;
  letter-spacing: 0.02em;
}

/* Letter row — single straight horizontal line */
.letter-row-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 0;
}

.letter-row {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  flex-wrap: nowrap;
  gap: var(--letter-gap);
  width: max-content;
  min-width: 100%;
  margin: 0 auto;
  padding: 0 0.75rem;
}

.letter-tile {
  flex-shrink: 0;
  width: var(--letter-w);
  height: var(--letter-h);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--gray-900);
  opacity: 0;
  transform: translateY(12px) scale(0.95);
  animation: letter-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.letter-tile:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
  border-color: rgba(255, 255, 255, 0.25);
  z-index: 2;
}

@keyframes letter-in {
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.letter-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.letter-tile .tile-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.25rem;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-align: center;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
  color: var(--white);
  opacity: 0;
  transition: opacity var(--transition);
}

.letter-tile:hover .tile-label {
  opacity: 1;
}

.space-tile {
  flex-shrink: 0;
  width: var(--space-w);
  height: var(--letter-h);
}

.placeholder-tile {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-500);
  background: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.03) 4px,
    rgba(255, 255, 255, 0.08) 4px,
    rgba(255, 255, 255, 0.08) 8px
  );
}

.placeholder-tile span {
  opacity: 0.6;
}

/* ── Info Card ────────────────────────────────────────────────── */
.info-heading {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--white);
  margin-bottom: 1.25rem;
}

.info-card p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.95rem;
  line-height: 1.95;
  font-weight: 300;
  letter-spacing: 0.01em;
}

.info-card em {
  color: rgba(255, 255, 255, 0.7);
  font-style: italic;
}

/* ── Footer ───────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 3rem 2rem 1rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.3);
  letter-spacing: 0.08em;
}

.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2rem 0 3.5rem;
  margin-top: 0.75rem;
}

.footer-content {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer-logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.9;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--white);
}

.footer-copyright {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.02em;
}

/* ── Toast ────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.85rem 1.5rem;
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--white);
  backdrop-filter: none;
  z-index: 100;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Accessibility ────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 640px) {
  :root {
    --letter-w: 72px;
    --letter-h: 98px;
    --letter-gap: 8px;
    --space-w: 24px;
    --section-gap: 2rem;
    --card-padding: 1.75rem;
  }

  .site-header {
    padding: 3rem 1.25rem 2rem;
  }

  .main-content {
    padding: 0 1.25rem 3.5rem;
  }

  .glass-card {
    padding: var(--card-padding);
  }

  .display-card {
    min-height: 280px;
    padding-top: 2rem;
    padding-bottom: 2rem;
  }

  .input-row {
    flex-direction: column;
  }

  .action-bar {
    justify-content: center;
  }

  .download-group {
    margin-left: 0;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .btn {
    padding: 0.7rem 1.1rem;
    font-size: 0.8rem;
  }

  .footer-content {
    padding: 0 1.25rem;
  }

  .footer-logo-img {
    width: 30px;
    height: 30px;
  }

  .footer-logo {
    font-size: 0.875rem;
  }
}

@media (max-width: 400px) {
  :root {
    --letter-w: 60px;
    --letter-h: 82px;
  }
}