:root {
  color-scheme: light;
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-soft: #f1f4fa;
  --text: #172033;
  --text-soft: #667085;
  --border: #dfe4ec;
  --primary: #5b4df5;
  --primary-hover: #493bdc;
  --primary-soft: #eeecff;
  --success: #17875f;
  --success-soft: #e7f8f1;
  --danger: #c9364f;
  --danger-soft: #fff0f2;
  --shadow: 0 18px 50px rgba(34, 40, 70, 0.09);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --transition: 180ms ease;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1320;
  --surface: #171c2c;
  --surface-soft: #202638;
  --text: #f4f6fb;
  --text-soft: #aeb7ca;
  --border: #30384d;
  --primary: #8a80ff;
  --primary-hover: #a199ff;
  --primary-soft: #28234f;
  --success: #54d3a2;
  --success-soft: #17382f;
  --danger: #ff8094;
  --danger-soft: #40232c;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 10%, rgba(91, 77, 245, 0.10), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  transition: background-color var(--transition), color var(--transition);
}

button, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.48; }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--text);
  color: var(--surface);
  transition: transform var(--transition);
}
.skip-link:focus { transform: translateY(0); }

.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(16px);
}

.header-content,
.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.header-content { min-height: 78px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 14px;
  background: var(--primary);
  color: white;
  box-shadow: 0 10px 26px rgba(91, 77, 245, 0.25);
}
.brand-icon svg { width: 28px; height: 28px; fill: currentColor; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1rem; letter-spacing: -0.02em; }
.brand small { color: var(--text-soft); font-size: 0.76rem; }

.icon-button {
  position: relative;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}
.icon-button:hover { border-color: var(--primary); transform: translateY(-2px); }
.theme-icon { position: absolute; transition: transform var(--transition), opacity var(--transition); }
.theme-icon-moon { opacity: 0; transform: translateY(28px); }
html[data-theme="dark"] .theme-icon-sun { opacity: 0; transform: translateY(-28px); }
html[data-theme="dark"] .theme-icon-moon { opacity: 1; transform: translateY(0); }

.main-content { padding: 72px 0 88px; }
.hero { max-width: 760px; margin: 0 auto 44px; text-align: center; }
.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hero h1, .section-heading h2 { margin: 0; letter-spacing: -0.045em; line-height: 1.1; }
.hero h1 { font-size: clamp(2.25rem, 7vw, 4.25rem); }
.hero p { max-width: 660px; margin: 20px auto 0; color: var(--text-soft); font-size: 1.06rem; }

.studio-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.panel {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  box-shadow: var(--shadow);
}
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.panel-heading > div { display: flex; align-items: center; gap: 12px; }
.panel-heading h2 { margin: 0; font-size: 1.15rem; letter-spacing: -0.02em; }
.step {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 11px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 900;
}
.char-counter, .status-badge {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--text-soft);
  font-size: 0.74rem;
  font-weight: 700;
}
.status-badge.is-ready { background: var(--success-soft); color: var(--success); }

.field-group label { display: inline-block; margin-bottom: 8px; font-size: 0.9rem; font-weight: 750; }
textarea {
  width: 100%;
  min-height: 190px;
  resize: vertical;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  background: var(--surface-soft);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
textarea::placeholder { color: color-mix(in srgb, var(--text-soft) 72%, transparent); }
textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 18%, transparent); background: var(--surface); }
textarea.is-invalid { border-color: var(--danger); box-shadow: 0 0 0 4px color-mix(in srgb, var(--danger) 14%, transparent); }
.field-meta { display: flex; justify-content: space-between; gap: 12px; margin-top: 7px; }
.field-meta small { color: var(--text-soft); font-size: 0.75rem; }
.field-meta .field-error { color: var(--danger); font-weight: 700; text-align: right; }

.actions { display: flex; gap: 12px; }
.primary-actions { margin-top: 22px; }
.export-actions { margin-top: 20px; }
.button {
  display: inline-flex;
  min-height: 46px;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-weight: 780;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.button:not(:disabled):hover { transform: translateY(-2px); }
.button-primary { background: var(--primary); color: white; box-shadow: 0 10px 20px color-mix(in srgb, var(--primary) 25%, transparent); }
.button-primary:not(:disabled):hover { background: var(--primary-hover); }
.button-secondary { border-color: var(--border); background: var(--surface); color: var(--text); }
.button-secondary:not(:disabled):hover { border-color: var(--primary); color: var(--primary); }

.privacy-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 22px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: var(--success-soft);
  color: var(--success);
}
.privacy-note p { margin: 0; font-size: 0.78rem; }

.qr-preview {
  display: grid;
  min-height: 286px;
  place-items: center;
  padding: 24px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  background:
    linear-gradient(45deg, color-mix(in srgb, var(--surface-soft) 70%, transparent) 25%, transparent 25%) 0 0 / 20px 20px,
    linear-gradient(-45deg, color-mix(in srgb, var(--surface-soft) 70%, transparent) 25%, transparent 25%) 0 10px / 20px 20px,
    linear-gradient(45deg, transparent 75%, color-mix(in srgb, var(--surface-soft) 70%, transparent) 75%) 10px -10px / 20px 20px,
    linear-gradient(-45deg, transparent 75%, color-mix(in srgb, var(--surface-soft) 70%, transparent) 75%) -10px 0 / 20px 20px;
}
.empty-state { max-width: 280px; text-align: center; }
.empty-icon {
  display: grid;
  width: 74px;
  height: 74px;
  margin: 0 auto 16px;
  place-items: center;
  border-radius: 22px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 2rem;
}
.empty-state h3 { margin: 0 0 6px; font-size: 1rem; }
.empty-state p { margin: 0; color: var(--text-soft); font-size: 0.83rem; }
.qrcode { padding: 16px; border-radius: 14px; background: #fff; box-shadow: 0 12px 32px rgba(30, 35, 60, 0.12); }
.qrcode img, .qrcode canvas { display: block; width: min(220px, 62vw) !important; height: auto !important; }

.features { margin-top: 88px; }
.section-heading { margin-bottom: 28px; text-align: center; }
.section-heading h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { padding: 24px; border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--surface); }
.feature-card > span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 12px; background: var(--primary-soft); color: var(--primary); font-size: 1.2rem; }
.feature-card h3 { margin: 18px 0 6px; font-size: 1rem; }
.feature-card p { margin: 0; color: var(--text-soft); font-size: 0.86rem; }

.site-footer {
  margin-top: 72px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-content {
  min-height: 132px;
  color: var(--text-soft);
  font-size: 0.84rem;
}

.footer-brand {
  display: grid;
  gap: 4px;
}

.footer-brand strong {
  color: var(--text);
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.footer-brand span {
  color: var(--text-soft);
}

.footer-author {
  display: grid;
  justify-items: end;
  gap: 10px;
}

.footer-author p {
  margin: 0;
}

.footer-author p strong {
  color: var(--text);
  font-weight: 700;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), color var(--transition);
}

.footer-links a:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  color: var(--primary);
}

.footer-links svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
  flex: 0 0 auto;
}

.toast-container { position: fixed; right: 20px; bottom: 20px; z-index: 50; display: grid; gap: 10px; width: min(360px, calc(100% - 40px)); }
.toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 13px;
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: toast-in 220ms ease both;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast p { margin: 0; font-size: 0.84rem; }
.toast strong { display: block; margin-bottom: 1px; }
.toast.is-leaving { animation: toast-out 180ms ease both; }

@keyframes toast-in { from { opacity: 0; transform: translateY(12px); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(8px); } }

:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 42%, transparent); outline-offset: 3px; }

@media (max-width: 800px) {
  .main-content { padding-top: 52px; }
  .studio-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .container { width: min(100% - 22px, 1120px); }
  .brand small { display: none; }
  .panel { padding: 20px; border-radius: 19px; }
  .panel-heading { align-items: center; }
  .field-meta { display: block; }
  .field-meta .field-error { display: block; margin-top: 4px; text-align: left; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
  .footer-content { flex-direction: column; justify-content: center; padding: 24px 0; text-align: center; }
  .footer-author { justify-items: center; }
  .footer-links { justify-content: center; flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}