:root,
[data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-display: 'Satoshi', 'Inter', sans-serif;
  --color-bg: #f7f6f2;
  --color-surface: #fbfbf9;
  --color-surface-2: #f3f0ec;
  --color-border: #d4d1ca;
  --color-text: #28251d;
  --color-text-muted: #6b6963;
  --color-primary: #01696f;
  --color-primary-hover: #0c4e54;
  --color-primary-highlight: #d8ecea;
  --color-success: #2f6f1e;
  --color-error: #a12c7b;
  --shadow-sm: 0 1px 2px rgba(25, 24, 20, 0.08);
  --shadow-md: 0 16px 40px rgba(25, 24, 20, 0.10);
}

[data-theme="dark"] {
  --color-bg: #171614;
  --color-surface: #1d1c1a;
  --color-surface-2: #232220;
  --color-border: #393836;
  --color-text: #ece8e2;
  --color-text-muted: #b7b1a8;
  --color-primary: #4f98a3;
  --color-primary-hover: #6aaebb;
  --color-primary-highlight: #25383d;
  --color-success: #88c56d;
  --color-error: #f08ac2;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.32);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #171614;
    --color-surface: #1d1c1a;
    --color-surface-2: #232220;
    --color-border: #393836;
    --color-text: #ece8e2;
    --color-text-muted: #b7b1a8;
    --color-primary: #4f98a3;
    --color-primary-hover: #6aaebb;
    --color-primary-highlight: #25383d;
    --color-success: #88c56d;
    --color-error: #f08ac2;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--color-primary) 10%, transparent), transparent 32%),
    linear-gradient(180deg, var(--color-bg), var(--color-surface-2));
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
a { color: inherit; }

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -3rem;
  background: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
}
.skip-link:focus { top: var(--space-4); }

.site-header,
.page-shell {
  width: min(100% - 2rem, 960px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-8) 0 var(--space-6);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand-mark {
  width: 3.5rem;
  height: 3.5rem;
  padding: 0.7rem;
  border-radius: 1rem;
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  border: 1px solid color-mix(in srgb, var(--color-border) 75%, transparent);
}

.eyebrow,
.kicker {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

h1, h2 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.15;
}

h1 { font-size: var(--text-xl); }
h2 { font-size: var(--text-lg); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.9rem;
  height: 2.9rem;
  border-radius: var(--radius-full);
  border: 1px solid color-mix(in srgb, var(--color-border) 72%, transparent);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

.intro-card,
.form-card {
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-border) 72%, transparent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
}

.intro-card {
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.form-card {
  padding: clamp(1.25rem, 2vw, 2rem);
  margin-bottom: var(--space-10);
}

.section-head {
  margin-bottom: var(--space-6);
}

.section-head p,
.intro-card p { color: var(--color-text-muted); margin: 0.4rem 0 0; }

.registration-form { display: grid; gap: var(--space-6); }
.grid { display: grid; gap: var(--space-5); }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.field { display: grid; gap: 0.45rem; }
label, legend { font-weight: 700; }

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="file"],
select,
textarea {
  width: 100%;
  border: 1px solid color-mix(in srgb, var(--color-border) 85%, transparent);
  background: var(--color-surface-2);
  color: var(--color-text);
  border-radius: var(--radius-md);
  padding: 0.92rem 1rem;
  min-height: 3.1rem;
}

textarea { resize: vertical; min-height: 7.5rem; }
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.hint, .counter {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}
.meta-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
}
.error {
  min-height: 1rem;
  color: var(--color-error);
  font-size: var(--text-xs);
}

.declaration-box {
  margin: 0;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--color-border) 85%, transparent);
  background: color-mix(in srgb, var(--color-primary-highlight) 42%, var(--color-surface));
}
.radio-wrap {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-top: var(--space-3);
}
.radio-wrap input[type="radio"] {
  width: 1.1rem;
  height: 1.1rem;
  margin-top: 0.25rem;
}

.captcha-wrap {
  display: grid;
  gap: var(--space-2);
  justify-content: start;
}

.actions {
  display: grid;
  gap: var(--space-4);
}
.submit-btn {
  min-height: 3.3rem;
  padding: 0.95rem 1.2rem;
  border-radius: var(--radius-full);
  border: 0;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #fff;
  background: var(--color-primary);
  cursor: pointer;
}
.submit-btn:hover:not(:disabled) { background: var(--color-primary-hover); }
.submit-btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.form-status {
  margin: 0;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  display: none;
}
.form-status.success {
  display: block;
  background: color-mix(in srgb, var(--color-success) 14%, var(--color-surface));
  color: var(--color-success);
}
.form-status.error {
  display: block;
  background: color-mix(in srgb, var(--color-error) 12%, var(--color-surface));
  color: var(--color-error);
}

@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
  .site-header { padding-top: var(--space-6); }
  .brand-wrap { align-items: flex-start; }
  .meta-row { flex-direction: column; }
  .g-recaptcha { transform: scale(0.92); transform-origin: left top; }
}