/* ============================================================
   energyproject.lt — Ivolve × Hitaro energijos kaupimo projektai
   Tema keičiama per šiuos kintamuosius.
   ============================================================ */

:root {
  /* Paletė (iš Dūkštas logo №3: žalsvai melsva #0F7A6B) */
  --paper: #F7F8F6;
  --mist: #ECF0EC;
  --line: #DCE1DB;
  --ink: #1B2A32;
  --muted: #4E5E66;
  --teal: #0F7A6B;         /* akcentas — CTA, metrikos, nuorodos */
  --teal-strong: #0C6156;  /* AA smulkiam tekstui ant paper/mist */
  --deep: #0C3F42;         /* antraštės */
  --dark: #0A2321;         /* tamsios sekcijos fonas */
  --paper-on-dark: #E9F0EE;
  --muted-on-dark: #9DB4AD;
  --teal-on-dark: #4FC2AE;

  /* Tipografika */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --size-display: clamp(2.2rem, 5.4vw, 3.8rem);
  --size-h2: clamp(1.55rem, 3vw, 2.3rem);
  --size-body: 1.02rem;
  --size-small: 0.86rem;

  /* Išdėstymas */
  --content-max: 72rem;
  --pad-x: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4rem, 9vw, 7rem);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: var(--size-body);
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3.5rem;
  z-index: 100;
  background: var(--deep);
  color: var(--paper-on-dark);
  padding: 0.6rem 1rem;
  border-radius: 4px;
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 1rem; }

/* ---------- Navigacija ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0.8rem var(--pad-x);
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand { display: inline-flex; align-items: center; text-decoration: none; }

.brand-img { display: block; height: 36px; width: auto; }

.brand-img-footer { height: 30px; }

.nav-links { display: flex; gap: 1.6rem; margin-left: auto; }

.nav-links a {
  text-decoration: none;
  font-size: 0.94rem;
  color: var(--muted);
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:hover, .nav-links a[aria-current="page"] {
  color: var(--deep);
  border-bottom-color: var(--teal);
}

.lang-toggle {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.lang-toggle button {
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.32rem 0.8rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--deep);
  color: var(--paper-on-dark);
}

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}

.burger-bar {
  display: block;
  height: 2px;
  border-radius: 1px;
  background: var(--deep);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-burger[aria-expanded="true"] .burger-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger[aria-expanded="true"] .burger-bar:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] .burger-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */

.hero { position: relative; overflow: hidden; }

.hero-inner {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(4rem, 9vw, 7rem) var(--pad-x) clamp(3rem, 7vw, 5rem);
}

.eyebrow {
  font-size: var(--size-small);
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.3rem;
}

.hero h1 {
  font-size: var(--size-display);
  font-weight: 700;
  color: var(--deep);
  max-width: 22ch;
  text-wrap: balance;
}

.hero-lead {
  margin-top: 1.5rem;
  max-width: 58ch;
  font-size: 1.1rem;
  color: var(--muted);
}

.hero-ctas { margin-top: 2.1rem; display: flex; flex-wrap: wrap; gap: 0.9rem; }

.btn {
  display: inline-block;
  text-decoration: none;
  font: inherit;
  font-size: 0.97rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 5px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary { background: var(--teal); color: #FFFFFF; }
.btn-primary:hover { background: var(--teal-strong); }

.btn-ghost { border-color: var(--line); color: var(--deep); background: transparent; }
.btn-ghost:hover { border-color: var(--teal); }

/* Faktų juosta */

.facts {
  margin-top: clamp(2.6rem, 5vw, 4rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 2rem 3.6rem;
}

.fact { display: flex; flex-direction: column-reverse; }

.fact dd {
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--deep);
}

.fact dt { font-size: var(--size-small); color: var(--muted); margin-top: 0.2rem; }

/* ---------- Bendros sekcijos ---------- */

.section-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--section-y) var(--pad-x);
}

.section-label {
  font-size: var(--size-small);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-strong);
  margin-bottom: 1.2rem;
}

.section-label-dark { color: var(--teal-on-dark); }

.alt { background: var(--mist); }

/* Teksto sekcijos (projekto puslapiai) */

.text-grid {
  display: grid;
  grid-template-columns: minmax(8rem, 14rem) 1fr;
  gap: 1.6rem 4rem;
  padding: clamp(2.2rem, 5vw, 3.2rem) 0;
  border-top: 1px solid var(--line);
}

.text-grid:first-of-type { border-top: 0; padding-top: 0; }

.text-grid h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--deep);
  letter-spacing: 0;
}

.text-grid p { max-width: 62ch; color: var(--ink); }
.text-grid p + p { margin-top: 0.9rem; }

/* ---------- Parko vizualai ---------- */

.park {
  margin-top: clamp(2rem, 5vw, 3rem);
  max-width: 30rem;
}

.park svg { display: block; width: 100%; height: auto; }

.park figcaption {
  margin-top: 0.6rem;
  font-size: var(--size-small);
  color: var(--muted);
}

.park-wide { max-width: 34rem; }

.pv-cont { fill: #D5E6E1; stroke: var(--teal); stroke-width: 1.4; }
.pv-mvps { fill: var(--deep); }
.pv-vent { stroke: var(--teal); stroke-width: 1.2; opacity: 0.4; }
.pv-line { stroke: var(--muted); stroke-width: 1.4; fill: none; }
.pv-fence { fill: none; stroke: var(--line); stroke-width: 1.5; stroke-dasharray: 5 4; }
.pv-road { fill: #E3E7E2; }

.park svg text {
  font: 600 12px var(--font-sans);
  fill: var(--muted);
  letter-spacing: 0.02em;
}

.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; margin-top: 0.35rem; }
.legend-item { display: inline-flex; align-items: center; gap: 0.45rem; }
.chip { width: 14px; height: 10px; border-radius: 2px; display: inline-block; }
.chip-cont { background: #D5E6E1; border: 1.4px solid var(--teal); }
.chip-mvps { background: var(--deep); }

/* ---------- Projektų kortelės (titulinis) ---------- */

.projects h2 {
  font-size: var(--size-h2);
  font-weight: 700;
  color: var(--deep);
  max-width: 24ch;
  margin-bottom: clamp(2rem, 4.5vw, 3rem);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  gap: 1.4rem;
}

.card {
  display: flex;
  flex-direction: column;
  border-top: 3px solid var(--teal);
  background: #FFFFFF;
  padding: 1.4rem 1.5rem 1.5rem;
  box-shadow: 0 0 0 1px var(--line);
  border-radius: 0 0 8px 8px;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 26px -16px rgba(12, 63, 66, 0.4), 0 0 0 1px var(--line);
}

.card-tag {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.card h3 { margin-top: 0.7rem; font-size: 1.22rem; font-weight: 700; color: var(--deep); }

.card-desc { margin-top: 0.55rem; font-size: 0.95rem; color: var(--muted); flex-grow: 1; }

.card-foot {
  margin-top: 1.4rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--line);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.card-metric {
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--teal-strong);
}

.card-more { font-size: 0.9rem; font-weight: 600; color: var(--teal-strong); }

/* ---------- Apie (titulinis) ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(8rem, 14rem) 1fr;
  gap: 2rem 4rem;
}

.about-p1 {
  font-size: clamp(1.15rem, 2.1vw, 1.45rem);
  line-height: 1.5;
  color: var(--deep);
  font-weight: 500;
  max-width: 46ch;
}

.about-p2 { margin-top: 1.3rem; max-width: 60ch; color: var(--muted); }

/* ---------- Kontaktai ---------- */

.contact { background: var(--dark); color: var(--paper-on-dark); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.2rem;
  align-items: start;
}

.contact h2 { font-size: var(--size-h2); font-weight: 700; max-width: 22ch; }

.contact-lead { margin-top: 1rem; color: var(--muted-on-dark); max-width: 46ch; }

.contact-details { margin-top: 2.2rem; display: grid; gap: 1.2rem; }

.contact-details dt {
  font-size: var(--size-small);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-on-dark);
}

.contact-details dd { margin-top: 0.15rem; font-size: 1.1rem; font-weight: 550; }

.contact-details a {
  color: var(--paper-on-dark);
  text-decoration: none;
  border-bottom: 1px solid var(--teal-on-dark);
  transition: color 0.15s ease;
}

.contact-details a:hover { color: var(--teal-on-dark); }

/* Forma */

.contact-form .hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact-form .field { margin-bottom: 1.2rem; }

.contact-form label {
  display: block;
  font-size: var(--size-small);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  font: inherit;
  color: var(--paper-on-dark);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(233, 240, 238, 0.28);
  border-radius: 5px;
  padding: 0.7rem 0.85rem;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--teal-on-dark);
  background: rgba(255, 255, 255, 0.1);
}

.contact-form input[aria-invalid="true"],
.contact-form textarea[aria-invalid="true"] { border-color: #F2A48C; }

.field-error { margin-top: 0.35rem; font-size: var(--size-small); color: #F4BCA6; }

.form-success {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--teal-on-dark);
  background: rgba(79, 194, 174, 0.12);
  font-size: 0.95rem;
}

.contact-form button[disabled] { opacity: 0.6; cursor: wait; }

/* ---------- Poraštė ---------- */

.footer {
  background: var(--dark);
  color: var(--muted-on-dark);
  border-top: 1px solid rgba(233, 240, 238, 0.14);
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.6rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  flex-wrap: wrap;
}

.footer-note { font-size: var(--size-small); max-width: 44ch; }

.footer-rights { font-size: var(--size-small); }

/* ---------- Judesys ---------- */

.rise { opacity: 0; transform: translateY(18px); animation: rise 0.7s ease forwards; }
.rise-1 { animation-delay: 0.05s; }
.rise-2 { animation-delay: 0.15s; }
.rise-3 { animation-delay: 0.28s; }
.rise-4 { animation-delay: 0.4s; }
.rise-5 { animation-delay: 0.55s; }

@keyframes rise { to { opacity: 1; transform: none; } }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rise, .reveal { opacity: 1; transform: none; animation: none; transition: none; }
  .card { transition: none; }
  .card:hover { transform: none; }
}

/* ---------- Adaptyvumas ---------- */

@media (max-width: 860px) {
  .about-grid, .text-grid { grid-template-columns: 1fr; gap: 0.6rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 2.6rem; }
}

@media (max-width: 700px) {
  .nav-inner { gap: 0.75rem; }
  .brand { margin-right: auto; }
  .nav-burger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 0.5rem var(--pad-x) 1rem;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 14px 24px -18px rgba(12, 63, 66, 0.4);
  }

  .nav.menu-open .nav-links { display: flex; }

  .nav-links a { padding: 0.85rem 0; font-size: 1.02rem; border-bottom: 1px solid var(--line); }
  .nav-links a:last-child { border-bottom-color: transparent; }

  .brand-img { height: 30px; }
}