/* ==========================================================================
   TheVisaTools — Global Design System
   style.css : tokens, reset, base, typography, components, ad slots, utilities
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  --color-primary: #0369a1;
  --color-primary-hover: #0284c7;
  --color-primary-light: #e0f2fe;
  --color-primary-dark: #0c4a6e;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-2: #f1f5f9;
  --color-surface-offset: #e2e8f0;
  --color-border: rgba(15, 23, 42, 0.08);
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-faint: #94a3b8;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;
  --color-warning: #d97706;
  --color-warning-light: #fef3c7;
  --color-error: #dc2626;
  --color-error-light: #fee2e2;
  --color-status-current: #16a34a;
  --color-status-waiting: #d97706;
  --color-status-unavailable: #64748b;

  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --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-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem;
  --space-4: 1rem; --space-6: 1.5rem; --space-8: 2rem;
  --space-10: 2.5rem; --space-12: 3rem; --space-16: 4rem;

  --radius-sm: 0.375rem; --radius-md: 0.5rem;
  --radius-lg: 0.75rem; --radius-xl: 1rem;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 1100px;
  --content-measure: 72ch;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }
ul, ol { padding-left: var(--space-6); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; color: var(--color-text); }
h1 { font-size: var(--text-xl); letter-spacing: -0.02em; }
h2 { font-size: var(--text-lg); letter-spacing: -0.01em; margin-block: var(--space-8) var(--space-4); }
h3 { font-size: var(--text-base); font-weight: 600; margin-block: var(--space-6) var(--space-2); }
p { margin-block: 0 var(--space-4); }
p:last-child { margin-bottom: 0; }
strong { font-weight: 600; }
code, kbd, samp { font-family: var(--font-mono); font-size: 0.9em; }
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 1000;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  transition: top var(--transition);
}
.skip-link:focus { top: var(--space-4); color: #fff; text-decoration: none; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}
.brand:hover { text-decoration: none; color: var(--color-primary-dark); }
.brand__mark { color: var(--color-primary); font-weight: 800; }
.main-nav { display: flex; align-items: center; }
.main-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0; padding: 0;
}
.main-nav__link {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.main-nav__link:hover { color: var(--color-text); background: var(--color-surface-2); text-decoration: none; }
.main-nav__link[aria-current="page"] { color: var(--color-primary); font-weight: 600; }
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.nav-toggle:hover { background: var(--color-surface-2); }
.nav-toggle svg { width: 24px; height: 24px; }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

/* ---------- Language switcher ---------- */
.lang-switcher { position: relative; margin-left: auto; }
.lang-switcher__btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  min-height: 40px; padding: var(--space-2) var(--space-3);
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 500;
  color: var(--color-text-muted); background: transparent;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  cursor: pointer; transition: color var(--transition), background var(--transition), border-color var(--transition);
}
.lang-switcher__btn:hover { color: var(--color-text); background: var(--color-surface-2); border-color: var(--color-primary-light); }
.lang-switcher__btn svg { flex: 0 0 auto; }
.lang-switcher__current { white-space: nowrap; }
.lang-switcher__menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  min-width: 11rem; margin: 0; padding: var(--space-1); list-style: none;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-md); z-index: 60;
}
.lang-switcher__menu li { margin: 0; }
.lang-switcher__item {
  display: block; width: 100%; text-align: left;
  min-height: 44px; padding: var(--space-2) var(--space-3);
  font-family: var(--font-body); font-size: var(--text-sm); color: var(--color-text);
  background: transparent; border: 0; border-radius: var(--radius-sm); cursor: pointer;
}
.lang-switcher__item:hover { background: var(--color-surface-2); }
.lang-switcher__item.is-active { color: var(--color-primary); font-weight: 600; background: var(--color-primary-light); }

@media (max-width: 768px) {
  .nav-toggle { display: inline-flex; }
  .main-nav {
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .main-nav.is-open { display: block; }
  .main-nav__list { flex-direction: column; align-items: stretch; gap: 0; padding: var(--space-2); }
  .main-nav__link { padding: var(--space-3); font-size: var(--text-base); }
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-16);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-8);
}
.site-footer h4 {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  margin-block: 0 var(--space-3);
}
.site-footer ul { list-style: none; padding: 0; }
.site-footer li { margin-bottom: var(--space-2); }
.site-footer a { color: var(--color-text-muted); }
.site-footer a:hover { color: var(--color-primary); }
.site-footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  text-align: center;
}
.btn:hover { text-decoration: none; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary-dark);
  border-color: var(--color-border);
}
.btn-secondary:hover { background: var(--color-surface-2); color: var(--color-primary-dark); }
.btn-ghost { background: transparent; color: var(--color-primary); }
.btn-ghost:hover { background: var(--color-primary-light); color: var(--color-primary-dark); }
.btn--block { width: 100%; }
.btn--lg { min-height: 52px; font-size: var(--text-base); padding-inline: var(--space-8); }

/* ---------- Card ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}
.card--pad-lg { padding: var(--space-8); }
.card__title { font-size: var(--text-base); font-weight: 600; margin-block: 0 var(--space-2); }
.card__title a { color: var(--color-text); }
.card__title a:hover { color: var(--color-primary); text-decoration: none; }
.card__desc { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0; }
a.card { display: block; transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition); }
a.card:hover { box-shadow: var(--shadow-md); border-color: rgba(15,23,42,0.14); text-decoration: none; transform: translateY(-2px); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.4;
  border-radius: 999px;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}
.badge--primary { background: var(--color-primary-light); color: var(--color-primary-dark); }
.badge--success { background: var(--color-success-light); color: #166534; }
.badge--warning { background: var(--color-warning-light); color: #92400e; }
.badge--error { background: var(--color-error-light); color: #991b1b; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: var(--space-4); }
.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.form-hint { display: block; font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-1); }
.form-input, .form-select {
  display: block;
  width: 100%;
  min-height: 48px;
  font-size: 1rem; /* >=16px prevents iOS zoom */
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-surface-offset);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
}
.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-input::placeholder { color: var(--color-text-faint); }
.form-input[aria-invalid="true"], .form-select[aria-invalid="true"] {
  border-color: var(--color-error);
}
.form-input[aria-invalid="true"]:focus, .form-select[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px var(--color-error-light);
}
.form-error {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}
.form-error.is-visible { display: block; }

/* Multi-line text input */
.form-textarea {
  min-height: 8rem;
  line-height: 1.6;
  resize: vertical;
}

/* Contact form submit status message */
.form-status {
  display: none;
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  border: 1px solid transparent;
}
.form-status.is-visible { display: block; }
.form-status--pending {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}
.form-status--success {
  background: var(--color-success-light);
  color: #166534;
  border-color: var(--color-success);
}
.form-status--error {
  background: var(--color-error-light);
  color: #991b1b;
  border-color: var(--color-error);
}

/* Checkbox rows */
.check-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.check-row:hover { background: var(--color-surface-2); }
.check-row input[type="checkbox"] {
  width: 20px; height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.check-row__label { font-size: var(--text-sm); line-height: 1.5; }
.check-row:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-light); }

/* ---------- Ad Slots ---------- */
.ad-slot {
  background: #fafafa;
  border: 1px dashed rgba(0,0,0,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  min-height: 90px;
  width: 100%;
  margin-block: var(--space-6);
}
.ad-slot--sidebar { min-height: 250px; width: 300px; margin-inline: auto; }
@media (max-width: 768px) {
  .ad-slot--sidebar { width: 100%; min-height: 90px; }
}

/* ---------- Utilities ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.text-sm { font-size: var(--text-sm); }
.text-center { text-align: center; }
.measure { max-width: var(--content-measure); }
.error-code { font-family: var(--font-mono); font-size: 4rem; font-weight: 700; line-height: 1; color: var(--color-primary); margin: 0 0 var(--space-3); }
.section { padding-block: var(--space-10); }
.stack > * + * { margin-top: var(--space-4); }
.hero-h1 { text-align: center; max-width: 20ch; margin-inline: auto; }
.hidden { display: none !important; }