/* ==========================================================================
   Garden Plant Finder — Base Styles
   Shared design tokens, reset, and typography
   ========================================================================== */

/* --- Design tokens ------------------------------------------------------ */

:root {
  /* Colours */
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1d1d1f;
  --color-text-muted: #6e6e73;
  --color-border: #e5e5ea;
  --color-accent: #2d6a4f;
  --color-accent-hover: #1b4332;
  --color-accent-light: #d8f3dc;

  /* Typography */
  --font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Layout */
  --sidebar-width: 280px;
  --header-height: 176px;
  --header-height-compact: 104px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --transition: 0.2s ease;
}

/* --- Reset -------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

ul {
  list-style: none;
}

/* --- Utility ------------------------------------------------------------ */

.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;
}

/* --- Hamburger Menu Button ---------------------------------------------- */
.hamburger-btn {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  z-index: 150;
  color: var(--color-text);
  transition:
    opacity 0.28s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.28s cubic-bezier(0.4, 0, 0.2, 1),
    background 0.2s ease;
}

.hamburger-btn:hover {
  background: rgba(45, 106, 79, 0.08);
}

.hamburger-btn__line {
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.28s ease;
  border-radius: 1px;
}

/* --- Navigation Drawer Overlay ------------------------------------------ */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 85%;
  max-width: 300px;
  height: 100vh;
  height: 100dvh;
  background: var(--color-surface);
  z-index: 200;
  transform: translateX(-105%);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  will-change: transform;
}

.mobile-nav-drawer.is-open {
  transform: translateX(0);
}

.mobile-nav-drawer__overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: rgba(15, 26, 20, 0.45);
  backdrop-filter: blur(4px);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
}

.mobile-nav-drawer.is-open + .mobile-nav-drawer__overlay {
  opacity: 1;
  pointer-events: auto;
}

@media (min-width: 768px) {
  .mobile-nav-drawer {
    width: 300px;
    max-width: 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hamburger-btn,
  .hamburger-btn__line,
  .mobile-nav-drawer,
  .mobile-nav-drawer__overlay {
    transition-duration: 0.01ms !important;
  }
}

.mobile-nav-drawer__content {
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.mobile-nav-drawer__close {
  align-self: flex-end;
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--color-text-muted);
  cursor: pointer;
  margin-bottom: var(--space-xl);
  transition: color var(--transition);
}

.mobile-nav-drawer__close:hover {
  color: var(--color-text);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-nav-links > a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition);
}

.mobile-nav-links .site-nav__icon {
  flex-shrink: 0;
  width: 1.25rem;
  font-size: 1rem;
  line-height: 1;
  text-align: center;
}

.mobile-nav-links > a:hover,
.mobile-nav-links > a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.mobile-nav-group {
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-group__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  padding: var(--space-xs) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  font-family: inherit;
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

.mobile-nav-group__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.mobile-nav-group__label .site-nav__icon {
  flex-shrink: 0;
  width: 1.25rem;
  font-size: 1rem;
  line-height: 1;
  text-align: center;
}

.mobile-nav-group__toggle:hover,
.mobile-nav-group.is-active .mobile-nav-group__toggle {
  color: var(--color-accent);
}

.mobile-nav-group__chevron {
  width: 0.55rem;
  height: 0.55rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--transition-fast);
}

.mobile-nav-group.is-open .mobile-nav-group__chevron {
  transform: rotate(-135deg);
}

.mobile-nav-group__items {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.5rem 0 1rem 0.75rem;
}

.mobile-nav-group.is-open .mobile-nav-group__items {
  display: flex;
}

.mobile-nav-group__items a {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0;
  border-bottom: none;
}

.mobile-nav-group__items .site-nav-menu__icon {
  flex-shrink: 0;
  width: 1.125rem;
  font-size: 0.9375rem;
  line-height: 1;
  text-align: center;
}

.mobile-nav-group__items a:hover,
.mobile-nav-group__items a.active {
  color: var(--color-accent);
}

.mobile-nav-group__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Nested Seasonal Calendar (mobile) */
.mobile-nav-nested {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-nav-nested__row {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.mobile-nav-nested__row > a {
  flex: 1;
  min-width: 0;
}

.mobile-nav-nested__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  padding: 0;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.mobile-nav-nested__toggle:hover,
.mobile-nav-nested.is-active > .mobile-nav-nested__row .mobile-nav-nested__toggle {
  color: var(--color-accent);
}

.mobile-nav-nested.is-open > .mobile-nav-nested__row .mobile-nav-group__chevron {
  transform: rotate(-135deg);
}

.mobile-nav-nested__items {
  display: none;
  flex-direction: column;
  gap: 0.625rem;
  padding: 0.35rem 0 0.5rem 0.85rem;
  border-left: 2px solid rgba(45, 106, 79, 0.15);
  margin-left: 0.35rem;
}

.mobile-nav-nested.is-open > .mobile-nav-nested__items {
  display: flex;
}

.mobile-nav-nested__items .mobile-nav-nested__items {
  margin-left: 0.25rem;
}

.mobile-nav-nested__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.mobile-nav-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.35rem 0 0.75rem;
}

.mobile-nav-section + .mobile-nav-section {
  border-top: 1px solid var(--color-border);
  margin-top: 0.35rem;
  padding-top: 0.85rem;
}

.mobile-nav-section__title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text);
}

.mobile-nav-section__items {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding-left: 0.35rem;
}

/* --- Drawer Backdrops ---------------------------------------------------- */
.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 198;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* --- Skip link ---------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-sm) var(--space-md);
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 300;
  transition: top 0.2s ease;
}

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

/* --- Shared page header (desktop nav) ----------------------------------- */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-header__nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.page-header__nav a:hover,
.page-header__nav a[aria-current="page"] {
  color: var(--color-text);
}

/* --- Shared footer ------------------------------------------------------ */

.page-footer {
  background: var(--color-text);
  color: #fff;
  padding: var(--space-2xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.page-footer__container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.page-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.page-footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: #fff;
}

.page-footer__logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: 1.25rem;
}

.page-footer__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: 320px;
}

.page-footer__links-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.page-footer__title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.page-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.page-footer__links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.page-footer__links a:hover {
  color: #fff;
}

.page-footer__bottom {
  max-width: 1100px;
  margin: var(--space-xl) auto 0;
  padding: var(--space-lg) var(--space-md) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

.page-footer__copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.page-footer__socials {
  display: flex;
  gap: var(--space-md);
}

.page-footer__socials a {
  font-size: 1.2rem;
  transition: transform var(--transition);
}

.page-footer__socials a:hover {
  transform: scale(1.15);
}

@media (min-width: 768px) {
  .page-footer__container {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .page-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}