/* ============================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   Fonts loaded via <link> in HTML per project spec.
   ============================================ */
:root {
  --color-bg: #f7f5ef;
  --color-surface: #ffffff;
  --color-surface-alt: #efebe3;
  --color-primary: #27662b;
  --color-primary-dark: #174219;
  --color-accent: #d4942a;
  --color-accent-soft: rgba(212, 148, 42, 0.14);
  --color-text: #171717;
  --color-text-muted: #5c5c5c;
  --color-border: #d4cec2;
  --color-shadow: rgba(23, 66, 25, 0.07);
  --color-shadow-deep: rgba(23, 66, 25, 0.12);
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;
}

[data-theme='dark'] {
  --color-bg: #121212;
  --color-surface: #1c1c1c;
  --color-surface-alt: #242424;
  --color-primary: #5cbf63;
  --color-primary-dark: #43a047;
  --color-accent: #e8b923;
  --color-accent-soft: rgba(232, 185, 35, 0.12);
  --color-text: #ececec;
  --color-text-muted: #a3a3a3;
  --color-border: #343434;
  --color-shadow: rgba(0, 0, 0, 0.35);
  --color-shadow-deep: rgba(0, 0, 0, 0.55);
}

/* ============================================
   2. CSS RESET & BASE
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  transition: background-color 0.3s ease;
  color-scheme: light;
}

html[data-theme='dark'] {
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  background-color: var(--color-bg);
  background-image:
    radial-gradient(ellipse 130% 85% at 100% -18%, color-mix(in srgb, var(--color-primary) 14%, transparent), transparent 55%),
    radial-gradient(ellipse 95% 65% at -8% 72%, color-mix(in srgb, var(--color-accent) 12%, transparent), transparent 50%);
  color: var(--color-text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
select,
textarea {
  font: inherit;
  color: inherit;
}

/* ============================================
   3. TYPOGRAPHY SCALE
   ============================================ */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
}

h3 {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
}

h4 {
  font-size: 1.125rem;
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

/* ============================================
   4. LAYOUT UTILITIES
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

.section__title {
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.section__title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  margin: var(--space-md) auto 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--color-primary) 85%, var(--color-accent)),
    var(--color-accent)
  );
}

.skip-link {
  position: absolute;
  left: var(--space-md);
  top: var(--space-md);
  z-index: 2000;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--radius-md);
  transform: translateY(-120%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  transform: translateY(0);
}

.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;
}

/* ============================================
   5. NAVBAR
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  backdrop-filter: saturate(1.35) blur(14px);
  -webkit-backdrop-filter: saturate(1.35) blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 80%, transparent);
  transition: box-shadow 0.3s ease, background-color 0.25s ease;
}

.navbar.scrolled {
  box-shadow: 0 8px 28px var(--color-shadow-deep);
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) 0;
}

.navbar__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

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

.logo-img {
  display: block;
  flex-shrink: 0;
  width: auto;
  height: 2.35rem;
  max-height: 2.5rem;
  object-fit: contain;
}

.logo-img--footer {
  height: 2rem;
  max-height: 2.125rem;
}

.logo-text {
  white-space: nowrap;
}

.navbar__nav {
  display: none;
}

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

.navbar__links .nav-link {
  color: var(--color-text-muted);
  font-weight: 600;
  text-decoration: none;
}

.navbar__links .nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.navbar__links .nav-link.nav-link--active {
  color: var(--color-primary);
}

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

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

.navbar__lang--desktop {
  display: none;
}

.lang-select {
  min-width: 8.5rem;
  max-width: 12rem;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: 0.875rem;
  box-shadow: 0 1px 3px var(--color-shadow);
}

.lang-select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: var(--color-primary);
}

.lang-select--block {
  width: 100%;
  max-width: none;
}

.theme-toggle {
  width: 2.75rem;
  height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

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

.hamburger span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: var(--space-md) 0 calc(var(--space-lg) + env(safe-area-inset-bottom));
}

.mobile-menu.is-open {
  display: block;
}

.mobile-menu__lang {
  padding: 0 var(--space-lg) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-sm);
}

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mobile-menu a {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  color: var(--color-text);
  font-weight: 600;
}

.mobile-menu a:hover {
  background: var(--color-surface-alt);
  text-decoration: none;
}

.mobile-menu a.nav-link--active {
  color: var(--color-primary);
}

@media (min-width: 1024px) {
  .navbar__nav {
    display: block;
  }

  .navbar__lang--desktop {
    display: flex;
  }

  .hamburger {
    display: none;
  }

  .mobile-menu {
    display: none !important;
  }
}

/* ============================================
   6. HERO (base)
   ============================================ */

/* ============================================
   7. FOOTER
   ============================================ */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 0;
  margin-top: auto;
}

.footer__inner {
  display: grid;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
}

.footer__credit {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.footer__credit a {
  color: var(--color-primary);
}

.footer__brand p {
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
  max-width: 280px;
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

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

.footer__logo-text {
  white-space: nowrap;
}

.footer__links h4 {
  font-family: var(--font-body);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
}

.footer__links ul li {
  margin-bottom: var(--space-sm);
}

.footer__links a {
  color: var(--color-text-muted);
}

.footer__links a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0 calc(var(--space-lg) + env(safe-area-inset-bottom));
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__legal-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm) var(--space-md);
  margin: 0;
  text-align: center;
  line-height: 1.5;
}

.footer__legal-part {
  display: inline;
}

.footer__legal-sep {
  opacity: 0.45;
  user-select: none;
}

.footer__bottom a {
  font-weight: 600;
  color: var(--color-primary);
}

.footer__bottom a:hover {
  color: var(--color-primary-dark);
}

@media (min-width: 640px) {
  .footer__inner {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer__inner {
    grid-template-columns: 2fr 1fr 1fr;
    align-items: start;
  }
}

/* ============================================
   8. TRANSITIONS (global tone)
   ============================================ */
body,
.navbar,
.footer,
.hero,
.section,
.card,
.tool-output,
.control-group *,
.form-group * {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}