/* ---------- Reset ---------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* ---------- Base ---------- */
html {
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base) var(--ease-standard),
              color var(--transition-base) var(--ease-standard);
}

main {
  flex: 1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

@media (min-width: 768px) {
  h1 { font-size: var(--font-size-5xl); }
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-8);
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  background: var(--color-primary-600);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
  transition: top var(--transition-fast) var(--ease-standard);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ---------- Site header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-primary);
}

.brand:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.brand__mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-md);
  letter-spacing: var(--letter-spacing-tight);
}

.brand__name span {
  color: var(--color-primary-600);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.nav__link:hover {
  color: var(--color-link);
  text-decoration: none;
}

.nav__logout-form {
  display: contents;
}

.nav__link-button {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast) var(--ease-standard),
              color var(--transition-fast) var(--ease-standard);
}

.theme-toggle:hover {
  background-color: var(--color-border);
  color: var(--color-text-primary);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
}

@media (max-width: 767px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4) var(--space-5) var(--space-6);
    display: none;
  }

  .nav.is-open {
    display: flex;
  }

  .nav__link {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
  }
}

/* ---------- Site footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}

.section-eyebrow {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-600);
  margin-bottom: var(--space-3);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-base) var(--ease-standard),
              box-shadow var(--transition-base) var(--ease-standard),
              transform var(--transition-fast) var(--ease-standard),
              border-color var(--transition-base) var(--ease-standard);
}

.btn:hover {
  text-decoration: none;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
}

.btn-primary {
  background-color: var(--color-primary-600);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: var(--color-text-inverse);
}

.btn-accent {
  /* accent-600, not -500: white text on -500 falls short of the 4.5:1
     WCAG AA text-contrast minimum (measured ~3.3:1). */
  background-color: var(--color-accent-600);
  color: var(--color-text-inverse);
}

.btn-accent:hover {
  background-color: var(--color-accent-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: var(--color-text-inverse);
}

.btn-ghost {
  background-color: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.btn-ghost:hover {
  background-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn-light {
  /* Fixed white/dark-navy, not theme-aware tokens: this button sits on a
     colored gradient banner regardless of site theme, so --color-surface
     (which turns dark in dark mode) made the text nearly invisible. */
  background-color: var(--color-white);
  color: var(--color-primary-700);
}

.btn-light:hover {
  background-color: var(--color-gray-50);
  color: var(--color-primary-800);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ---------- Cards ---------- */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card-interactive {
  transition: box-shadow var(--transition-base) var(--ease-standard),
              transform var(--transition-base) var(--ease-standard),
              border-color var(--transition-base) var(--ease-standard);
}

.card-interactive:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--color-border-strong);
}

.stretched-link::after {
  content: "";
  position: absolute;
  inset: 0;
}

/* ---------- Scroll reveal (see reveal.js) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms var(--ease-standard), transform 600ms var(--ease-standard);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal][data-reveal-delay="1"] { transition-delay: 90ms; }
[data-reveal][data-reveal-delay="2"] { transition-delay: 180ms; }
[data-reveal][data-reveal-delay="3"] { transition-delay: 270ms; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Forms ---------- */
.form-card {
  position: relative;
  max-width: 440px;
  margin-inline: auto;
}

.form-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--space-8);
  right: var(--space-8);
  height: 3px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary-600), var(--color-accent-500));
}

.field {
  margin-bottom: var(--space-5);
}

.field label {
  display: block;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.field input[type="text"],
.field input[type="email"],
.field input[type="password"] {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast) var(--ease-standard),
              box-shadow var(--transition-fast) var(--ease-standard);
}

.field input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.field-error input {
  border-color: var(--color-error);
}

.field-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.field-error-message {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-2);
}

.field-checkbox-group {
  margin-bottom: var(--space-5);
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.checkbox-field label {
  margin: 0;
}

.checkbox-field input {
  margin-top: 3px;
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary-600);
  flex-shrink: 0;
}

.form-banner {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-5);
}

.form-banner-error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}