:root {
  color-scheme: light dark;
  --base-font: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --accent-font: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --bg-color: #111827;
  --surface-color: #141b2d;
  --surface-elevated: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --accent-green: #1fff5f;
  --accent-pink: #ff3eb5;
  --accent-yellow: #f5f748;
  --accent-blue: #61f4ff;
  --border-color: rgba(148, 163, 184, 0.24);
  --shadow-soft: 0 12px 32px rgba(15, 23, 42, 0.28);
  --header-bg: rgba(15, 23, 42, 0.72);
  font-size: 16px;
  background-color: var(--bg-color);
  color: var(--text-primary);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme='dark']) {
    --bg-color: #f5f7fb;
    --surface-color: #ffffff;
    --surface-elevated: #f1f5ff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: rgba(100, 116, 139, 0.22);
    --shadow-soft: 0 18px 36px rgba(15, 23, 42, 0.12);
  }
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg-color: #f5f7fb;
  --surface-color: #ffffff;
  --surface-elevated: #f1f5ff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: rgba(100, 116, 139, 0.22);
  --shadow-soft: 0 18px 36px rgba(15, 23, 42, 0.12);
  --header-bg: rgba(255, 255, 255, 0.85);
}

:root[data-theme='dark'] {
  color-scheme: dark;
}

:root[data-theme='light'] .badge {
  background: rgba(31, 255, 95, 0.14);
}

:root[data-theme='light'] .card {
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

:root[data-theme='light'] .canvas-wrapper {
  background: radial-gradient(circle at top, rgba(31, 255, 95, 0.08), rgba(225, 235, 255, 0.9));
  border: 1px solid rgba(94, 234, 212, 0.18);
}

:root[data-theme='light'] footer {
  background: rgba(226, 232, 240, 0.8);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: var(--base-font);
  background: var(--bg-color);
  color: var(--text-primary);
  min-height: 100%;
}

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

a:hover,
a:focus {
  text-decoration: underline;
}

header {
  backdrop-filter: blur(16px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav {
  margin: 0 auto;
  max-width: 1200px;
  padding: 1rem clamp(1rem, 5vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

nav a {
  font-weight: 600;
  color: var(--text-primary);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

main {
  margin: 0 auto;
  max-width: 1200px;
  padding: clamp(1.5rem, 5vw, 3rem) clamp(1rem, 5vw, 2.5rem) 5rem;
}

h1,
h2,
h3 {
  font-family: var(--accent-font);
  margin: 0 0 1rem;
}

section + section {
  margin-top: 2.5rem;
}

button,
input,
select,
textarea {
  font: inherit;
  background: transparent;
  color: inherit;
}

button {
  border-radius: 999px;
  border: 1px solid var(--accent-blue);
  background: linear-gradient(135deg, rgba(97, 244, 255, 0.18), rgba(31, 255, 95, 0.25));
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

button:hover,
button:focus {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
  outline: none;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.subtle {
  border-radius: 12px;
  border: 1px dashed rgba(97, 244, 255, 0.28);
  background: transparent;
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  box-shadow: none;
}

.subtle:hover,
.subtle:focus {
  border-color: rgba(31, 255, 95, 0.6);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 999px;
  border: 1px solid rgba(97, 244, 255, 0.4);
  background: rgba(15, 23, 42, 0.35);
  padding: 0.35rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

:root[data-theme='light'] .theme-toggle {
  background: rgba(148, 163, 184, 0.2);
}

.theme-toggle:hover,
.theme-toggle:focus {
  border-color: var(--accent-green);
  background: rgba(31, 255, 95, 0.18);
  transform: translateY(-1px);
}

.theme-toggle__icon {
  font-size: 1.05rem;
}

.accordion {
  display: grid;
  gap: 0.75rem;
}

.accordion-item {
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: var(--surface-elevated);
  overflow: hidden;
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: none;
  background: transparent;
  color: inherit;
  text-align: left;
  padding: 1.1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
}

.accordion-trigger:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 4px;
}

.accordion-icon {
  transition: transform 0.2s ease;
}

.accordion-trigger[aria-expanded='true'] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-panel {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
}

.accordion-panel[hidden] {
  display: none;
}

.card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 0 6px 24px rgba(15, 23, 42, 0.24);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.controls-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  align-items: start;
}

input[type='text'],
input[type='number'],
textarea,
select {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  background: rgba(15, 23, 42, 0.6);
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

fieldset {
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 16px;
  padding: 1rem 1.25rem 1.25rem;
  margin: 0;
}

legend {
  padding: 0 0.5rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}

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

.radio-group,
.size-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.radio-pill {
  border-radius: 999px;
  border: 1px solid var(--border-color);
  padding: 0.4rem 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.radio-pill input {
  accent-color: var(--accent-green);
}

.radio-pill:hover,
.radio-pill:has(input:checked) {
  border-color: var(--accent-green);
  background: rgba(31, 255, 95, 0.18);
}

.checkbox-pill {
  border-radius: 999px;
  border: 1px solid var(--border-color);
  padding: 0.4rem 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease;
  width: fit-content;
}

.checkbox-pill input {
  accent-color: var(--accent-green);
}

.checkbox-pill:hover,
.checkbox-pill:has(input:checked) {
  border-color: var(--accent-green);
  background: rgba(31, 255, 95, 0.18);
}

.canvas-wrapper {
  background: radial-gradient(circle at top, rgba(31, 255, 95, 0.1), rgba(20, 27, 45, 0.9));
  border-radius: 24px;
  padding: 1.5rem;
  border: 1px solid rgba(97, 244, 255, 0.12);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: center;
}

canvas {
  max-width: min(100%, 540px);
  border-radius: 24px;
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.45);
}

.preview-meta {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.alt-suggestion {
  background: rgba(15, 23, 42, 0.58);
  border-radius: 12px;
  padding: 1rem;
  border: 1px solid rgba(97, 244, 255, 0.12);
  font-size: 0.9rem;
}

.helper {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

footer {
  border-top: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.72);
  margin-top: 4rem;
}

footer .nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

footer .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 5vw, 2rem);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  color: var(--text-secondary);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: rgba(31, 255, 95, 0.18);
  color: var(--accent-green);
  font-size: 0.75rem;
  font-weight: 600;
}

@media (max-width: 768px) {
  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  nav ul {
    flex-wrap: wrap;
  }

  main {
    padding-top: 2rem;
  }

  .canvas-wrapper {
    padding: 1rem;
  }
}