/* =========================================================
   DARC Consultancy — styles
   Minimal, Apple-inspired: πολύς λευκός χώρος, μεγάλη τυπογραφία,
   φωτογραφίες σε όλο το πλάτος. Τα χρώματα είναι στο :root.
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-alt: #f5f4f2;      /* ζεστό γκρι, από το γκρι του λογοτύπου */
  --ink: #1d1d1f;         /* κύριο κείμενο */
  --ink-soft: #6e6c69;    /* δευτερεύον κείμενο */
  --brand: #9b9793;       /* γκρι DARC (ίδιο με την επαγγελματική κάρτα) */
  --line: #e4e2df;
  --dark: #141414;
  --nav-bg: rgba(255, 255, 255, 0.78);
  --nav-line: rgba(0, 0, 0, 0.06);
  --btn-bg: #1d1d1f;
  --btn-ink: #ffffff;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
          "Manrope", "Helvetica Neue", Arial, sans-serif;

  --wrap: 1120px;
  --gutter: max(20px, env(safe-area-inset-left, 0px));
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; text-wrap: balance; }
p { margin: 0; }

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-left: var(--gutter);
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

.eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- GREY MODE (σαν την πίσω όψη της κάρτας) ----------
   Ενεργοποιείται με το κουμπί δίπλα στο EL / EN.
   Αλλάζουν μόνο τα χρώματα (tokens), όχι το layout. */
:root[data-theme="grey"] {
  --bg: #9b9793;
  --bg-alt: #908c88;
  --ink: #ffffff;
  --ink-soft: #f4f2ef;
  --brand: #ffffff;
  --line: rgba(255, 255, 255, 0.38);
  --dark: #2b2927;
  --nav-bg: rgba(155, 151, 147, 0.82);
  --nav-line: rgba(255, 255, 255, 0.22);
  --btn-bg: #ffffff;
  --btn-ink: #6e6a66;
}
.logo--light { display: none; }
:root[data-theme="grey"] .logo--dark { display: none; }
:root[data-theme="grey"] .logo--light { display: block; }
body { transition: background-color .4s ease, color .4s ease; }

.theme-toggle {
  width: 32px; height: 32px; padding: 0; margin-left: 4px;
  display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 50%;
  background: none; color: var(--ink); cursor: pointer;
  transition: border-color .2s;
}
.theme-toggle:hover { border-color: var(--ink); }
.theme-toggle:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.theme-toggle svg { width: 16px; height: 16px; }

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--nav-line);
}
.nav__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 0 max(20px, env(safe-area-inset-right, 0px)) 0 var(--gutter);
  height: 56px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__logo img { height: 30px; width: auto; }
.nav__links { display: flex; gap: 28px; margin-left: auto; }
.nav__links a {
  font-size: 14px;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color .2s;
}
.nav__links a:hover { color: var(--ink); }

.lang { display: flex; align-items: center; gap: 4px; font-size: 13px; color: var(--line); }
.nav__tools { display: flex; align-items: center; gap: 12px; }
.lang button {
  font: inherit;
  background: none;
  border: 0;
  padding: 6px 4px;
  cursor: pointer;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}
.lang button[aria-pressed="true"] { color: var(--ink); font-weight: 600; }
.lang button:focus-visible, .btn:focus-visible, a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- HERO ---------- */
.hero { padding-top: clamp(64px, 10vw, 120px); }
.hero__text { text-align: center; display: grid; justify-items: center; gap: 20px; }
.hero h1 {
  font-size: clamp(44px, 8vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.035em;
}
.lead {
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.4;
  color: var(--ink-soft);
  max-width: 34em;
}
.hero__cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 28px; margin-top: 12px; }
.hero__media {
  margin: clamp(48px, 7vw, 88px) 0 0;
  height: clamp(320px, 62vw, 760px);
  background: var(--bg-alt);
  overflow: hidden;
}
.hero__media img { width: 100%; height: 100%; object-fit: cover; }

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 980px;
  font-size: 16px;
  text-decoration: none;
  transition: opacity .2s;
}
.btn--dark { background: var(--btn-bg); color: var(--btn-ink); }
.btn--dark:hover { opacity: .85; }
.link-arrow { font-size: 16px; text-decoration: none; color: var(--ink); }
.link-arrow::after { content: " ›"; }
.link-arrow:hover { text-decoration: underline; }

/* ---------- SECTIONS ---------- */
.section { padding-block: clamp(80px, 12vw, 160px); }
.section--alt { background: var(--bg-alt); }
.section--dark { background: var(--dark); color: #f5f5f7; }
.section--dark .eyebrow { color: var(--brand); }
.section__head { display: grid; gap: 14px; max-width: 760px; margin-bottom: clamp(48px, 7vw, 80px); }
.section h2 { font-size: clamp(34px, 5vw, 56px); line-height: 1.08; }

/* Company */
.about { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 48px; }
.about__col { display: grid; gap: 12px; align-content: start; }
.about__col h3 { font-size: 21px; }
.about__col p { color: var(--ink-soft); }
.sectors {
  list-style: none; margin: clamp(48px, 7vw, 72px) 0 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 10px;
}
.sectors li {
  padding: 8px 18px; border: 1px solid var(--line); border-radius: 980px;
  font-size: 15px; color: var(--ink-soft);
}

/* Services: λίστα με λεπτές γραμμές, χωρίς κάρτες */
.services {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  column-gap: 48px;
}
.service {
  border-top: 1px solid var(--line);
  padding-block: 28px 44px;
  display: grid;
  gap: 10px;
  align-content: start;
}
.service h3 { font-size: 21px; }
.service p { color: var(--ink-soft); }

/* Statement band */
.band { position: relative; height: clamp(440px, 60vw, 720px); overflow: hidden; background: var(--dark); }
.band__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.band__overlay {
  position: absolute; inset: 0;
  display: flex; align-items: flex-end;
  padding-bottom: clamp(40px, 6vw, 80px);
  background: linear-gradient(to top, rgba(0,0,0,.62), rgba(0,0,0,0) 60%);
  color: #fff;
}
.band__overlay .wrap { width: 100%; display: grid; gap: 14px; }
.band h2 { font-size: clamp(34px, 5.5vw, 64px); line-height: 1.05; }
.band p { font-size: clamp(17px, 1.8vw, 21px); max-width: 32em; opacity: .85; }

/* Approach steps */
.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px;
}
.steps li { display: grid; gap: 10px; align-content: start; }
.steps__n { font-size: 14px; color: var(--brand); font-variant-numeric: tabular-nums; letter-spacing: .06em; }
.steps h3 { font-size: 24px; }
.steps p { color: var(--ink-soft); }

/* Projects */
.projects {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}
.project { display: grid; gap: 16px; }
.project--wide { grid-column: 1 / -1; }
.project__img {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--bg-alt);
  max-width: 100%;
}
.project--wide .project__img { aspect-ratio: 21 / 9; }
.project__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s ease; }
.project:hover .project__img img { transform: scale(1.03); }
.project__meta h3 { font-size: 21px; }
.project__meta p { color: var(--ink-soft); font-size: 15px; }

a.project { text-decoration: none; color: inherit; }
.projects__more { margin-top: 40px; }
.projects__empty { color: var(--ink-soft); }

/* Σελίδα έργων */
.projects-page { padding-top: clamp(64px, 10vw, 120px); }
.page-title { font-size: clamp(40px, 6vw, 72px); line-height: 1.05; letter-spacing: -0.03em; }
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }
.chip {
  font: inherit; font-size: 15px; cursor: pointer;
  padding: 8px 18px; border-radius: 980px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink-soft);
  transition: background .2s, color .2s;
}
.chip:hover { color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--btn-bg); border-color: var(--btn-bg); color: var(--btn-ink); }
.chip:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

/* Σελίδα ενός έργου */
.pd__head { padding-top: clamp(48px, 8vw, 96px); display: grid; gap: 14px; }
.pd__back { font-size: 14px; text-decoration: none; color: var(--ink-soft); margin-bottom: 12px; }
.pd__back:hover { color: var(--ink); }
.pd__head h1 { font-size: clamp(40px, 6vw, 72px); line-height: 1.05; letter-spacing: -0.03em; }
.pd__cover { margin: clamp(40px, 6vw, 64px) 0 0; height: clamp(300px, 56vw, 720px); background: var(--bg-alt); overflow: hidden; }
.pd__cover img { width: 100%; height: 100%; object-fit: cover; }
.pd__body {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 64px;
  padding-block: clamp(56px, 8vw, 96px);
}
.pd__facts { margin: 0; display: grid; align-content: start; }
.pd__facts div { padding-block: 14px; border-top: 1px solid var(--line); }
.pd__facts dt { font-size: 13px; color: var(--ink-soft); }
.pd__facts dd { margin: 2px 0 0; }
.pd__text { display: grid; gap: 1em; align-content: start; font-size: clamp(18px, 1.8vw, 21px); line-height: 1.55; max-width: 36em; }
.gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; padding-bottom: clamp(80px, 10vw, 140px); }
.gallery__item { margin: 0; border-radius: var(--radius); overflow: hidden; aspect-ratio: 4 / 3; background: var(--bg-alt); max-width: 100%; }
.gallery__item:first-child:nth-last-child(odd), .gallery__item:only-child { grid-column: 1 / -1; aspect-ratio: 16 / 9; }
.gallery__item img { width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 900px) { .pd__body { grid-template-columns: 1fr; gap: 32px; } }
@media (max-width: 640px) { .gallery { grid-template-columns: 1fr; } .gallery__item:first-child:nth-last-child(odd) { aspect-ratio: 4 / 3; } }

/* Contact */
.contact { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 64px; align-items: end; }
.contact h2 { margin-top: 14px; }
.contact__list { margin: 0; display: grid; gap: 0; }
.contact__list div { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 16px; padding-block: 16px; border-top: 1px solid #2c2c2e; }
.contact__list dt { color: #8e8e93; font-size: 15px; }
.contact__list dd { margin: 0; overflow-wrap: anywhere; }
.contact__list a { text-decoration: none; }
.contact__list a:hover { text-decoration: underline; }

/* Εταιρικά στοιχεία (μικρά γράμματα, όπως το legal της Apple) */
.legal { padding-block: 48px 24px; background: var(--bg-alt); font-size: 13px; color: var(--ink-soft); }
.legal__title { font-size: 13px; font-weight: 600; letter-spacing: 0; color: var(--ink); margin-bottom: 16px; }
.legal__grid { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 32px; }
.legal__grid div { min-width: 0; }
.legal__grid dt { color: var(--ink); font-weight: 500; }
.legal__grid dd { margin: 2px 0 0; overflow-wrap: anywhere; }
/* Ξεχωριστή σελίδα company-info.html */
.legal--page { padding-block: clamp(64px, 10vw, 120px); background: var(--bg); font-size: 15px; }
.legal--page .legal__title { font-size: clamp(32px, 5vw, 48px); letter-spacing: -0.02em; margin-bottom: 12px; }
.legal__intro { margin-bottom: 40px; }
.legal--page .legal__grid { gap: 0 48px; }
.legal--page .legal__grid div { padding-block: 16px; border-top: 1px solid var(--line); }

.footer__links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer__links a { text-decoration: none; color: var(--ink-soft); }
.footer__links a:hover { color: var(--ink); text-decoration: underline; }
@media (max-width: 900px) { .legal__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .legal__grid { grid-template-columns: 1fr; } }

/* Νομικές σελίδες (privacy / cookies / terms) */
.doc { padding-top: clamp(64px, 10vw, 120px); }
.doc__wrap { max-width: 820px; }
.doc__date { color: var(--ink-soft); font-size: 14px; margin: 14px 0 48px; }
.doc__body { display: grid; gap: 14px; max-width: 42em; }
.doc__body h2 { font-size: 21px; margin-top: 24px; }
.doc__body p, .doc__body li { color: var(--ink-soft); }
.doc__body strong { color: var(--ink); font-weight: 600; }
.doc__body ul { margin: 0; padding-left: 1.2em; display: grid; gap: 8px; }
.doc__body a { text-decoration: underline; text-underline-offset: 2px; }
html[lang="en"] [data-lang-block="el"], html:not([lang="en"]) [data-lang-block="en"] { display: none; }

/* Footer */
.footer { padding-block: 40px; border-top: 1px solid var(--line); }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; font-size: 13px; color: var(--ink-soft); }
.footer img { height: 24px; width: auto; }

/* Fade-in κατά το scroll (μόνο αν υποστηρίζεται, ποτέ κρυμμένο περιεχόμενο χωρίς JS) */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .9s ease, transform .9s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
  .services { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about { grid-template-columns: 1fr; gap: 32px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__tools { margin-left: auto; }
  .services, .steps, .projects { grid-template-columns: 1fr; }
  .project--wide .project__img { aspect-ratio: 4 / 3; }
  .contact__list div { grid-template-columns: 1fr; gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .project__img img { transition: none; }
}