/* ============================================================
   Stand.earth —  Syntax Generator
   styles.css

   Structure:
   1. Custom properties (design tokens)
   2. Reset & base
   3. Skip link (accessibility)
   4. Site header
   5. Main nav tabs
   6. App layout
   7. Sidebar
   8. Main content / Generator sections
   9. Form elements
  10. Output box
  11. Alert banner
  12. Utility classes
  13. Responsive overrides
   ============================================================ */

/* ── 1. Design tokens ──────────────────────────────────────── */
:root {
  /* Brand colours (Stand.earth brand guide 2022) */
  --color-red: #e50b12;
  --color-red-dark: #c20a10;
  --color-black: #101012;
  --color-light: #f5f4ed;
  --color-white: #ffffff;
  --color-teal: #00857d;

  /* UI greys derived from the palette */
  --color-gray: #747473;
  --color-border: #d5d4cd;
  --color-bg-hover: #f0efe8;
  --color-bg-active: #fdf0f0; /* sidebar active item */

  /* Typography */
  --font-heading: "Readex Pro", sans-serif;
  --font-body: "Roboto", sans-serif;
  --font-mono: "Roboto Mono", monospace;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;

  /* Layout */
  --sidebar-width: 220px;
  --header-height: 72px;
  --nav-height: 49px;
  --sticky-offset: calc(var(--header-height) + var(--nav-height));

  /* Transitions */
  --transition-fast: 0.12s ease;
  --transition-base: 0.2s ease;

  /* Focus ring */
  --focus-ring: 0 0 0 3px rgba(229, 11, 18, 0.35);
}

/* ── 2. Reset & base ───────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  background: var(--color-light);
  color: var(--color-black);
  min-height: 100vh;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
}

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

button {
  cursor: pointer;
  font-family: inherit;
}

/* Visible focus for keyboard users (overridden per component below) */
:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ── 3. Skip link ──────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  background: var(--color-red);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8125rem;
  padding: var(--space-2) var(--space-4);
  border-radius: 0 0 4px 4px;
  text-decoration: none;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 0;
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ── 4. Site header ────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-height);
  background: var(--color-black);
  padding: 0 var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-header__logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.site-header__logo-link:focus-visible {
  box-shadow: var(--focus-ring);
  border-radius: 2px;
}

/* Logo is red; invert to white on dark header */
.site-header__logo {
  height: 32px;
  width: auto;
  filter: brightness(0) invert(1);
}

.site-header__tool-name {
  font-family: var(--font-heading);
  font-size: 1.25rem; /* 20px */
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-white);
  white-space: nowrap;
}

/* ── 5. Main nav tabs ──────────────────────────────────────── */
.main-nav {
  position: sticky;
  top: var(--header-height);
  z-index: 100;
  background: var(--color-white);
  border-bottom: 2px solid var(--color-black);
  padding: 0 var(--space-8);
  display: flex;
  gap: 0;
  height: var(--nav-height);
  align-items: stretch;
}

.main-nav__tab {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.75rem; /* 12px */
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 0 var(--space-6);
  background: none;
  border: none;
  color: var(--color-gray);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px; /* overlap the nav border */
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
}
.main-nav__tab:hover {
  color: var(--color-black);
}
.main-nav__tab--active,
.main-nav__tab[aria-selected="true"] {
  color: var(--color-red);
  border-bottom-color: var(--color-red);
}
.main-nav__tab:focus-visible {
  box-shadow: var(--focus-ring);
  border-radius: 2px;
  outline: none;
}

/* ── 6. App layout ─────────────────────────────────────────── */
.app-layout {
  display: flex;
  /* min-height: calc(100vh - var(--sticky-offset)); */
  flex: 1;
}

/* ── 7. Sidebar ────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-white);
  border-right: 1px solid var(--color-border);
  padding: var(--space-5) 0;
  position: sticky;
  top: var(--sticky-offset);
  max-height: calc(100vh - var(--sticky-offset) - var(--footer-height));
  overflow-y: auto;
  /* Subtle scroll shadow when content overflows */
  background:
    linear-gradient(var(--color-white) 30%, rgba(255, 255, 255, 0)) center top,
    linear-gradient(rgba(255, 255, 255, 0), var(--color-white) 70%) center
      bottom,
    radial-gradient(farthest-side at 50% 0, rgba(0, 0, 0, 0.08), transparent)
      center top,
    radial-gradient(farthest-side at 50% 100%, rgba(0, 0, 0, 0.08), transparent)
      center bottom;
  background-repeat: no-repeat;
  background-size:
    100% 40px,
    100% 40px,
    100% 10px,
    100% 10px;
  background-attachment: local, local, scroll, scroll;
  background-color: var(--color-white);
}

.sidebar__group-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7625rem; /* 9px */
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-gray);
  padding: var(--space-4) var(--space-5) var(--space-1);
  /* Ensure groups don't collapse spacing */
  margin-top: var(--space-3);
}
.sidebar__group-label:first-child {
  margin-top: 0;
}

.sidebar__btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.8125rem; /* 13px */
  line-height: 1.4;
  color: var(--color-black);
  background: none;
  border: none;
  border-left: 3px solid transparent;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}
.sidebar__btn:hover {
  background: var(--color-bg-hover);
  color: var(--color-red);
}
.sidebar__btn--active {
  border-left-color: var(--color-red);
  background: var(--color-bg-active);
  color: var(--color-red);
  font-weight: 500;
}
.sidebar__btn:focus-visible {
  box-shadow: inset var(--focus-ring);
  outline: none;
}

/* ── 8. Main content / Generator sections ─────────────────── */
.main-content {
  flex: 1;
  padding: var(--space-8) var(--space-10);
  max-width: 840px;
  /* Absorb focus when section changes (tabindex="-1") */
  outline: none;
}

.gen-section {
  display: none;
}
.gen-section--active {
  display: block;
}

.gen-section__header {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.gen-section__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.375rem; /* 22px */
  color: var(--color-black);
  /* margin-bottom: var(--space-2); */
}
.gen-section__title--accent {
  color: var(--color-red);
}

.gen-section__title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

/* Platform logo (img) in section header */
.gen-section__platform-logo {
  height: 45px;
  width: auto;
  max-width: 130px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.8;
}

.gen-section__desc {
  font-size: 0.8125rem;
  color: var(--color-gray);
  line-height: 1.6;
  max-width: 60ch;
}

.gen-section__example-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-top: var(--space-3);
  flex-wrap: wrap;
}

.gen-section__example-label {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--color-gray);
  flex-shrink: 0;
}

.gen-section__example {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  background: var(--color-light);
  border: 1px solid var(--color-border);
  color: var(--color-black);
  padding: 3px var(--space-2);
  border-radius: 3px;
  word-break: break-all;
}

/* ── 9. Form elements ─────────────────────────────────────── */

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.form-grid--1col {
  grid-template-columns: 1fr;
}
.form-grid--3col {
  grid-template-columns: 1fr 1fr 1fr;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-field--full {
  grid-column: 1 / -1;
}

.form-field__label {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.6875rem; /* 11px */
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--color-gray);
}
.form-field__code {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-red);
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  margin-left: var(--space-1);
}

/* Shared input/select styles */
.form-field__input,
.form-field__select {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.8125rem;
  color: var(--color-black);
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-2) var(--space-3);
  width: 100%;
  transition: border-color var(--transition-fast);
  outline: none;
}
.form-field__input::placeholder {
  color: #b0afa8;
}
.form-field__input:focus,
.form-field__select:focus {
  border-color: var(--color-red);
  box-shadow: 0 0 0 3px rgba(229, 11, 18, 0.12);
}

/* Custom select arrow */
.form-field__select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23747473' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}
.form-field__select:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Readonly/info text below a field (e.g. pre-set medium) */
.form-field__hint {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-gray);
  margin-top: 2px;
}

/* Inline age-range row */
.age-row {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}
.age-row__sep {
  font-size: 0.75rem;
  color: var(--color-gray);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 22px; /* align with input top */
}
.age-row .form-field {
  flex: 1;
}

/* Form actions row (reset button) */
.form-actions {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.btn-reset {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--color-gray);
  background: none;
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-2) var(--space-4);
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
}
.btn-reset:hover {
  color: var(--color-black);
  border-color: var(--color-gray);
}
.btn-reset:focus-visible {
  box-shadow: var(--focus-ring);
  outline: none;
}

/* ── 10. Output box ────────────────────────────────────────── */
.output-box {
  background: var(--color-black);
  border-radius: 6px;
  padding: var(--space-5) var(--space-6);
}

.output-box__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.output-box__label {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-gray);
}

.output-box__char-count {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-gray);
  transition: color var(--transition-fast);
}
.output-box__char-count--warn {
  color: #f09914;
}
.output-box__char-count--danger {
  color: var(--color-red);
}

/* The output text — aria-live announces changes to screen readers */
.output-box__text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-white);
  word-break: break-all;
  line-height: 1.7;
  min-height: 1.5em;
  margin-bottom: var(--space-4);
}
.output-box__text--empty {
  color: #444;
  font-style: italic;
}

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

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: var(--color-red);
  color: var(--color-white);
  border: none;
  border-radius: 4px;
  padding: var(--space-2) var(--space-5);
  transition:
    background var(--transition-fast),
    transform 0.1s;
}
.btn-copy:hover {
  background: var(--color-red-dark);
}
.btn-copy:active {
  transform: scale(0.97);
}
.btn-copy--success {
  background: var(--color-teal);
}
.btn-copy:focus-visible {
  box-shadow: 0 0 0 3px rgba(229, 11, 18, 0.5);
  outline: none;
}
.btn-copy__icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ── 11. Alert banner ──────────────────────────────────────── */
.alert {
  background: #fff8e6;
  border: 1.5px solid #f09914;
  border-radius: 4px;
  padding: var(--space-3) var(--space-4);
  font-size: 0.75rem;
  color: #7a4f00;
  margin-bottom: var(--space-5);
  line-height: 1.6;
}
.alert strong {
  font-weight: 500;
  color: #c47000;
}

/* Section divider with label (for multi-section generators) */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0 var(--space-6);
  position: relative;
}
.section-divider::after {
  content: attr(data-label);
  position: absolute;
  top: -0.6em;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-gray);
  background: var(--color-light);
  padding-right: var(--space-3);
}

/* ── 12. Utility classes ───────────────────────────────────── */
.u-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;
}

/* Medium badge shown below pre-set link generators */
.medium-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 2px var(--space-2);
  color: var(--color-gray);
}
.medium-badge__value {
  color: var(--color-black);
  font-weight: 400;
}

/* ── 13. Responsive overrides ──────────────────────────────── */
@media (max-width: 900px) {
  .main-content {
    padding: var(--space-5) var(--space-5);
  }
}

@media (max-width: 720px) {
  /* Sidebar collapses — use an overlay approach or just hide */
  .sidebar {
    display: none;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-grid--3col {
    grid-template-columns: 1fr;
  }
  .form-field--full {
    grid-column: 1;
  }
}

@media (max-width: 480px) {
  .site-header {
    padding: 0 var(--space-4);
  }
  .main-nav {
    padding: 0 var(--space-4);
  }
  .main-content {
    padding: var(--space-4);
  }
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

.site-footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.site-footer__main {
  font-size: 0.75rem;
  color: var(--color-gray);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.site-footer__slack {
  font-size: 0.75rem;
  color: var(--color-gray);
}

.site-footer__slack strong {
  font-weight: 500;
  color: var(--color-black);
}

.site-footer__legal {
  font-size: 0.75rem;
  color: var(--color-gray);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-footer__link {
  color: var(--color-gray);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer__link:hover {
  color: var(--color-red);
}