/* ============ base.css ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
}
body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; }
p, li { text-wrap: pretty; }
::selection { background: color-mix(in oklab, var(--color-primary) 30%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
button { cursor: pointer; background: none; border: none; }
a, button, input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }

/* ============ tokens ============ */
:root {
  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.4vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --text-2xl: clamp(2rem, 1.4rem + 2.5vw, 3.25rem);

  --space-1: 0.25rem; --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; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem;

  --radius-sm: 0.375rem; --radius-md: 0.625rem; --radius-lg: 1rem; --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --content-narrow: 640px;
  --content-default: 760px;
}

:root, [data-theme="light"] {
  --color-bg: #f5f4ef;
  --color-surface: #ffffff;
  --color-surface-2: #fbfaf6;
  --color-surface-offset: #ececE4;
  --color-border: #d9d7cd;
  --color-divider: #e4e2d8;

  --color-text: #131311;
  --color-text-muted: #5c5b53;
  --color-text-faint: #9a9890;
  --color-text-inverse: #f5f4ef;

  --color-primary: #4a5a1f;
  --color-primary-hover: #37430f;
  --color-primary-active: #2a3308;
  --color-primary-highlight: #dfe6c6;
  --color-accent: #b6f22c;

  --color-error: #9c2b2b;
  --color-error-highlight: #f1d9d6;
  --color-success: #3f6b2c;
  --color-success-highlight: #dbe7cf;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 90 / 0.08);
  --shadow-md: 0 8px 24px oklch(0.2 0.01 90 / 0.10);
  --shadow-lg: 0 20px 48px oklch(0.2 0.01 90 / 0.14);
}

[data-theme="dark"] {
  --color-bg: #0c0c0a;
  --color-surface: #151512;
  --color-surface-2: #1a1a16;
  --color-surface-offset: #1f1f1a;
  --color-border: #2c2c26;
  --color-divider: #24241f;

  --color-text: #f2f0e8;
  --color-text-muted: #a6a498;
  --color-text-faint: #6c6a60;
  --color-text-inverse: #131311;

  --color-primary: #c8ff5e;
  --color-primary-hover: #d8ff8c;
  --color-primary-active: #aee02f;
  --color-primary-highlight: #2a331a;
  --color-accent: #c8ff5e;

  --color-error: #ef8b8b;
  --color-error-highlight: #3a2222;
  --color-success: #9fd97a;
  --color-success-highlight: #223322;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 8px 24px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 20px 48px oklch(0 0 0 / 0.5);
}

/* ============ layout ============ */
body { overflow-x: hidden; }

.page {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5) var(--space-24);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-6);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}

.brand img { display: block; height: 22px; width: auto; }
.brand [data-logo-dark] { display: none; }
[data-theme="dark"] .brand [data-logo-light] { display: none; }
[data-theme="dark"] .brand [data-logo-dark] { display: block; }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text-faint); }
.theme-toggle svg { width: 18px; height: 18px; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.eyebrow::before, .eyebrow::after { content: ""; width: 6px; height: 1px; background: var(--color-text-faint); }

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}
.hero p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 62ch;
  margin-bottom: var(--space-2);
}
.hero .meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.chip {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-top: var(--space-10);
  box-shadow: var(--shadow-sm);
}

fieldset { border: none; }
.field-group { display: grid; gap: var(--space-6); margin-bottom: var(--space-8); }
.field-row { display: grid; gap: var(--space-6); grid-template-columns: 1fr 1fr; }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field label {
  font-size: var(--text-sm);
  font-weight: 600;
}
.field .hint { font-size: var(--text-xs); color: var(--color-text-faint); }
.field input, .field select, .field textarea {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text);
}
.field input::placeholder, .field textarea::placeholder { color: var(--color-text-faint); }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 22%, transparent);
}
.field textarea { resize: vertical; min-height: 90px; }
.field-error { font-size: var(--text-xs); color: var(--color-error); min-height: 1em; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: var(--color-error); }

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}
.section-sub { color: var(--color-text-muted); font-size: var(--text-sm); margin-bottom: var(--space-5); }

.doc-box {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  max-height: 220px;
  overflow-y: auto;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.doc-box h4 { font-size: var(--text-sm); color: var(--color-text); margin-bottom: var(--space-2); font-family: var(--font-display); }
.doc-box ul { padding-left: var(--space-5); list-style: disc; display: grid; gap: var(--space-1); margin-bottom: var(--space-3); }
.doc-box p { margin-bottom: var(--space-3); }
.doc-box p:last-child, .doc-box ul:last-child { margin-bottom: 0; }

.agree-block { margin-bottom: var(--space-10); }
.agree-block:last-of-type { margin-bottom: var(--space-8); }

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}
.checkbox-row input[type="checkbox"] {
  margin-top: 3px;
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}
.checkbox-row label { font-size: var(--text-sm); color: var(--color-text); }

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

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  background: var(--color-text);
  color: var(--color-text-inverse);
}
[data-theme="dark"] .btn { background: var(--color-primary); color: var(--color-primary-active); }
.btn:hover { opacity: 0.88; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.form-status {
  font-size: var(--text-sm);
  color: var(--color-error);
}
.form-status[data-state="ok"] { color: var(--color-success); }

.success-panel {
  text-align: center;
  padding: var(--space-16) var(--space-6);
}
.success-panel .mark {
  width: 56px; height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: grid; place-items: center;
  margin: 0 auto var(--space-6);
}
.success-panel .mark svg { width: 26px; height: 26px; }
.success-panel h2 { font-family: var(--font-display); font-size: var(--text-xl); margin-bottom: var(--space-3); }
.success-panel p { color: var(--color-text-muted); max-width: 48ch; margin: 0 auto; }

.hidden { display: none !important; }

footer.page-footer {
  margin-top: var(--space-16);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
}