/* ==========================================================================
   Νικολέττα Καντέλη — Φυσικός | Εκπαιδευτικός
   Design system: dark editorial, εμπνευσμένο από Grete (Qode Interactive)
   ========================================================================== */

:root{
  --bg:        #121212;
  --bg-alt:    #181818;
  --bg-panel:  #1c1c1c;
  --line:      rgba(255,255,255,.09);
  --line-soft: rgba(255,255,255,.05);
  --white:     #FFFFFF;
  --ink-70:    rgba(255,255,255,.72);
  --ink-50:    rgba(255,255,255,.50);
  --gold:      #e8c333;
  --gold-dim:  rgba(232,195,51,.35);
  --serif:     'Source Sans Pro', 'Helvetica Neue', Arial, sans-serif;
  --sans:      'Source Sans Pro', 'Helvetica Neue', Arial, sans-serif;
  --maxw:      1180px;
  --gap:       clamp(1.5rem, 4vw, 3.5rem);
  --sidebar-w: 280px;
  --topbar-h:  92px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--white);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
ul{ margin: 0; padding: 0; list-style: none; }
section{ position: relative; }

.container{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

/* container-fluid: πλήρες πλάτος (100%), χωρίς max-width — για το header */
.container-fluid{
  width: 100%;
  margin: 0;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

/* ---------- Τυπογραφία ---------- */
h1, h2, h3, h4{
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.18;
  margin: 0;
  color: var(--white);
}
h1{ font-size: clamp(2.4rem, 6vw, 4.6rem); }
h2{ font-size: clamp(1.9rem, 4vw, 2.9rem); }
h3{ font-size: clamp(1.25rem, 2.4vw, 1.55rem); }
h4{ font-size: 1.15rem; }

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 1.1rem;
}
.eyebrow::before{
  content: '';
  width: 28px; height: 1px;
  background: var(--gold);
  display: inline-block;
}

p{ color: var(--ink-70); margin: 0 0 1.1em; }
p.lead{ font-size: 1.15rem; color: var(--ink-70); }
.text-gold{ color: var(--gold); }
.text-center{ text-align: center; }

/* ---------- Κουμπιά ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  padding: .95rem 2.1rem;
  font-family: var(--sans);
  font-size: .82rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: all .3s ease;
  white-space: nowrap;
}
.btn-primary{ background: var(--gold); color: #14120a; }
.btn-primary:hover{ background: transparent; color: var(--gold); border-color: var(--gold); }
.btn-outline{ background: transparent; color: var(--white); border-color: rgba(255,255,255,.35); }
.btn-outline:hover{ border-color: var(--gold); color: var(--gold); }
.btn-row{ display: flex; flex-wrap: wrap; gap: 1rem; }

/* ---------- Header ----------
   Mobile-first: fixed top bar, off-canvas nav (hamburger).
   ≥1200px: γίνεται fixed αριστερή κατακόρυφη πλοήγηση (βλ. media query στο τέλος). */
.site-header{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 999;
  padding: 1.6rem 0;
  transition: background .35s ease, padding .35s ease, box-shadow .35s ease;
}
.site-header.is-scrolled{
  background: rgba(18,18,18,.92);
  backdrop-filter: blur(10px);
  padding: 1rem 0;
  box-shadow: 0 1px 0 var(--line);
}
.site-header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand{
  font-family: var(--serif);
  font-size: 1.25rem;
  letter-spacing: .03em;
  color: var(--white);
}
.brand span{ color: var(--gold); }
.brand small{
  display: block;
  font-family: var(--sans);
  font-size: .62rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-50);
  margin-top: .25rem;
  font-weight: 400;
}

.main-nav{
  position: fixed; top: 0; right: 0;
  height: 100vh; width: min(320px, 86vw);
  background: #0e0e0e;
  border-left: 1px solid var(--line);
  padding: 7rem 2.2rem 2.4rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateX(100%);
  transition: transform .4s ease;
  z-index: 1000;
  overflow-y: auto;
}
.main-nav.is-open{ transform: translateX(0); }
.main-nav ul{ display: flex; flex-direction: column; gap: 1.5rem; }
.main-nav a{
  font-size: .8rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-70);
  font-weight: 400;
  position: relative;
  padding-bottom: 6px;
  transition: color .25s ease;
}
.main-nav a::after{
  content: '';
  position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width .3s ease;
}
.main-nav a:hover, .main-nav a.active{ color: var(--white); }
.main-nav a:hover::after, .main-nav a.active::after{ width: 100%; }

.nav-toggle{
  display: block;
  width: 30px; height: 22px;
  position: relative;
  background: none; border: none; cursor: pointer;
  z-index: 1001;
}
.nav-toggle span{
  position: absolute; left: 0; right: 0; height: 1px;
  background: var(--white); transition: all .3s ease;
}
.nav-toggle span:nth-child(1){ top: 0; }
.nav-toggle span:nth-child(2){ top: 10px; }
.nav-toggle span:nth-child(3){ top: 20px; }
.nav-toggle.is-open span:nth-child(1){ transform: translateY(10px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2){ opacity: 0; }
.nav-toggle.is-open span:nth-child(3){ transform: translateY(-10px) rotate(-45deg); }

/* ---------- Social εικονίδια (header/sidebar & footer) ---------- */
.nav-socials{ display: flex; gap: .8rem; margin-top: 2.2rem; }
.main-nav .nav-socials{ margin-top: 2.2rem; }
.nav-socials a{
  width: 36px; height: 36px;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-70);
  transition: border-color .25s ease, color .25s ease;
}
.nav-socials a:hover{ border-color: var(--gold); color: var(--gold); }
.nav-socials svg{ width: 15px; height: 15px; fill: currentColor; display: block; }
.footer-socials{ margin-top: 1.4rem; }

/* ---------- Hero ---------- */
.hero{
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 9rem 0 5rem;
  background:
    radial-gradient(circle at 82% 18%, rgba(232,195,51,.08), transparent 45%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}
.hero-grid{
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: var(--gap);
  align-items: center;
}
.hero-name{ margin-bottom: .6rem; }
.hero-role{
  font-family: var(--sans);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--gold);
  letter-spacing: .04em;
  font-weight: 400;
  margin-bottom: 1.4rem;
}
.hero-meta{
  display: flex; flex-wrap: wrap; gap: .5rem 1.1rem;
  font-size: .88rem; color: var(--ink-50);
  margin-bottom: 1.8rem;
}
.hero-meta span{ display: inline-flex; align-items: center; gap: .5rem; }
.hero-meta span:not(:last-child)::after{
  content: '·'; margin-left: 1.1rem; color: var(--line);
}
.hero-quote{
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--white);
  border-left: 2px solid var(--gold);
  padding-left: 1.3rem;
  margin: 1.8rem 0 2.3rem;
  max-width: 46ch;
}
.hero-photo-wrap{
  position: relative;
  justify-self: center;
}
.hero-photo-frame{
  position: relative;
  width: min(340px, 78vw);
}
.hero-photo-frame img{
  position: relative; z-index: 2;
  width: 100%;
  filter: grayscale(.15) contrast(1.03);
  border: 1px solid var(--line);
}
.hero-photo-frame::before{
  content: '';
  position: absolute;
  top: -18px; right: -18px; z-index: 1;
  width: 100%; height: 100%;
  border: 1px solid var(--gold-dim);
}
.hero-photo-frame::after{
  content: '';
  position: absolute;
  bottom: -22px; left: 50%;
  transform: translateX(-50%);
  width: 60%; height: 2px;
  background: var(--gold);
}

/* ---------- Γενικά sections ---------- */
.section{ padding: clamp(4.5rem, 9vw, 7.5rem) 0; }
.section-alt{ background: var(--bg-alt); }
.section-border-t{ border-top: 1px solid var(--line); }
.section-head{ max-width: 720px; margin-bottom: 3.2rem; }
.section-head.center{ margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Πλέγμα (πυλώνες / cards) ---------- */
.grid{ display: grid; gap: 1.75rem; }
.grid-2{ grid-template-columns: repeat(2, 1fr); }
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-4{ grid-template-columns: repeat(4, 1fr); }

.card{
  background: var(--bg-panel);
  border: 1px solid var(--line);
  padding: 2.2rem 2rem;
  transition: border-color .3s ease, transform .3s ease;
}
.card:hover{ border-color: var(--gold-dim); transform: translateY(-4px); }
.card .icon{ font-size: 1.8rem; margin-bottom: 1.1rem; display: block; }
.card h3{ margin-bottom: .8rem; }
.card p{ margin-bottom: 0; font-size: .96rem; }
.card .card-link{
  display: inline-block; margin-top: 1rem;
  font-size: .8rem; letter-spacing: .06em; color: var(--gold);
  border-bottom: 1px solid var(--gold-dim);
}

.pillar{ display: flex; gap: 1.4rem; }
.pillar .num{
  font-family: var(--serif);
  font-size: 2.2rem; color: var(--gold-dim); line-height: 1;
  min-width: 3rem;
}
.pillar h3{ margin-bottom: .6rem; }
.pillar p{ font-size: .96rem; margin-bottom: 0; }

/* ---------- Στατιστικά / impact ---------- */
.stats{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.stat{
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 2.6rem 1.5rem;
  text-align: center;
}
.stat .num{
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4vw, 3rem);
  color: var(--gold);
  display: block;
  margin-bottom: .4rem;
}
.stat .label{
  font-size: .82rem;
  color: var(--ink-50);
  letter-spacing: .03em;
}
.stat .note{ font-size: .7rem; color: var(--ink-50); opacity: .7; }

/* ---------- Timeline ---------- */
.timeline{ position: relative; margin-top: 1rem; }
.timeline::before{
  content: '';
  position: absolute; left: 10px; top: 6px; bottom: 6px;
  width: 1px; background: var(--line);
}
.timeline-item{
  position: relative;
  padding-left: 3.2rem;
  margin-bottom: 3rem;
}
.timeline-item:last-child{ margin-bottom: 0; }
.timeline-item::before{
  content: '';
  position: absolute; left: 4px; top: 6px;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--gold);
}
.timeline-item .years{
  font-family: var(--sans);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: .5rem;
  display: inline-block;
}
.timeline-item h3{ margin-bottom: .3rem; }
.timeline-item .role{ color: var(--ink-50); font-size: .9rem; margin-bottom: .8rem; display: block; }
.timeline-item p{ font-size: .96rem; max-width: 62ch; }

/* ---------- Quote / statement block ---------- */
.statement{
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}
.statement blockquote{
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.5;
  color: var(--white);
  margin: 0 0 1.2rem;
}
.statement cite{
  font-style: normal;
  font-size: .82rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-50);
}

/* ---------- Placeholder blocks (portfolio / testimonials) ---------- */
.placeholder-card{
  border: 1px dashed var(--line);
  background: var(--bg-panel);
  padding: 2.4rem 2rem;
  text-align: center;
}
.placeholder-card .icon{
  width: 46px; height: 46px;
  border: 1px solid var(--gold-dim);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.1rem;
  color: var(--gold);
  font-size: 1.1rem;
}
.placeholder-card h4{ margin-bottom: .5rem; }
.placeholder-card p{ font-size: .88rem; margin-bottom: 0; }

.testimonial-slot{
  border-left: 2px solid var(--gold-dim);
  padding-left: 1.3rem;
}
.testimonial-slot p{ font-style: italic; font-family: var(--serif); font-size: 1.05rem; color: var(--ink-70); }
.testimonial-slot cite{ font-style: normal; font-size: .8rem; color: var(--ink-50); }

/* ---------- Review cards (Google reviews) ---------- */
.review-card{
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  padding: 2rem 1.9rem 1.7rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.review-card .stars{ color: var(--gold); letter-spacing: .15em; font-size: .85rem; margin-bottom: 1rem; }
.review-card p{
  font-style: italic;
  font-size: .96rem;
  color: var(--ink-70);
  flex-grow: 1;
  margin-bottom: 1.4rem;
}
.review-card cite{
  font-style: normal;
  display: block;
  font-size: .88rem;
  color: var(--white);
  font-weight: 600;
}
.review-card cite span{
  display: block;
  font-weight: 400;
  font-size: .78rem;
  color: var(--ink-50);
  margin-top: .15rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ---------- Instagram embed grid ---------- */
.ig-embed-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.6rem;
  justify-items: center;
}
.ig-embed-grid iframe, .ig-embed-grid blockquote.instagram-media{ width: 100% !important; }
.ig-embed-single{ max-width: 540px; margin: 0 auto; }

/* ---------- Chip links (εξωτερικές αναφορές — Instagram / Facebook) ---------- */
.chip-links{ display: flex; flex-wrap: wrap; gap: .6rem; }
.chip-links a{
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .5rem .9rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: .78rem;
  color: var(--ink-70);
  transition: border-color .25s ease, color .25s ease;
}
.chip-links a svg{ width: 13px; height: 13px; fill: currentColor; flex-shrink: 0; }
.chip-links a:hover{ border-color: var(--gold); color: var(--gold); }

/* ---------- Λίστα μαθημάτων / axes ---------- */
.tag-list{ display: flex; flex-wrap: wrap; gap: .7rem; }
.tag{
  border: 1px solid var(--line);
  padding: .5rem 1.1rem;
  font-size: .85rem;
  color: var(--ink-70);
  border-radius: 2px;
}

/* ---------- Two-col με divider ---------- */
.split{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}
.split-media img{ border: 1px solid var(--line); }

/* ---------- Contact ---------- */
.contact-grid{
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: var(--gap);
  align-items: start;
}
.contact-item{
  display: flex; align-items: center; gap: 1rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
}
.contact-item .icon{ color: var(--gold); font-size: 1.2rem; width: 28px; }
.contact-item a, .contact-item span{ font-size: 1.02rem; color: var(--white); }
.contact-item .label{ display: block; font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-50); margin-bottom: .2rem; }

/* ---------- Footer ---------- */
.site-footer{
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  padding: 3.5rem 0 2rem;
}
.footer-grid{
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-brand .brand{ margin-bottom: .9rem; }
.footer-brand p{ font-size: .9rem; max-width: 34ch; }
.footer-col h4{
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 1.2rem;
}
.footer-col ul li{ margin-bottom: .7rem; }
.footer-col a{ font-size: .92rem; color: var(--ink-70); transition: color .25s; }
.footer-col a:hover{ color: var(--gold); }
.footer-bottom{
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .6rem;
  font-size: .78rem; color: var(--ink-50);
}

/* ---------- Page header (εσωτερικές σελίδες) ---------- */
.page-header{
  padding: 8.5rem 0 3.5rem;
  border-bottom: 1px solid var(--line);
  background: radial-gradient(circle at 15% 0%, rgba(232,195,51,.06), transparent 50%);
}
.breadcrumb{ font-size: .8rem; color: var(--ink-50); margin-top: .8rem; }
.breadcrumb a{ color: var(--ink-50); }
.breadcrumb a:hover{ color: var(--gold); }

/* ---------- Jump-nav (anchor pills, π.χ. στο Portfolio) ---------- */
.jump-nav{
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.8rem;
}
.jump-nav a{
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--ink-70);
  transition: border-color .25s ease, color .25s ease, background .25s ease;
}
.jump-nav a::before{
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}
.jump-nav a:hover{ border-color: var(--gold); color: var(--white); background: rgba(232,195,51,.08); }

/* ---------- Reveal on scroll ---------- */
.reveal{ opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible{ opacity: 1; transform: translateY(0); }

/* ---------- CTA band ---------- */
.cta-band{
  text-align: center;
  padding: clamp(3.5rem, 7vw, 5.5rem) 0;
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
}
.cta-band h2{ margin-bottom: 1.2rem; }
.cta-band p{ max-width: 56ch; margin-left: auto; margin-right: auto; }

/* ---------- Responsive ---------- */

/* ≥1200px — αριστερή κατακόρυφη πλοήγηση (όπως στο σχεδιαστικό παράδειγμα) */
@media (min-width: 1200px){
  body{ padding-left: var(--sidebar-w); }

  .site-header{
    top: 0; left: 0; bottom: 0; right: auto;
    width: var(--sidebar-w);
    height: 100vh;
    padding: 0;
    background: var(--bg-alt);
    border-right: 1px solid var(--line);
    box-shadow: none;
  }
  .site-header.is-scrolled{
    background: var(--bg-alt);
    padding: 0;
    box-shadow: none;
  }
  .site-header-inner{
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    height: 100%;
    width: 100%;
    padding: 3rem 2.2rem;
    gap: 2.8rem;
  }

  .nav-toggle{ display: none; }
  .nav-scrim{ display: none; }

  .main-nav{
    position: static;
    top: auto; right: auto;
    width: 100%; height: auto;
    background: none; border: none;
    padding: 0;
    transform: none;
    flex: 1;
    overflow-y: visible;
  }
  .main-nav ul{ flex-direction: column; gap: 1.5rem; }
  .nav-socials{ margin-top: 0; }

  /* Χωρίς fixed top bar πλέον· λιγότερο κενό στην κορυφή */
  .hero{ padding-top: 4.5rem; }
  .page-header{ padding-top: 5.5rem; }
}

@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; text-align: left; }
  .hero-photo-wrap{ order: -1; margin-bottom: 1rem; }
  .grid-4{ grid-template-columns: repeat(2, 1fr); }
  .grid-3{ grid-template-columns: repeat(2, 1fr); }
  .grid-2, .split, .contact-grid{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  .stats{ grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px){
  .grid-4, .grid-3{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr; gap: 2rem; }
  .stats{ grid-template-columns: 1fr 1fr; }
  .hero{ padding-top: 7.5rem; }
}

.nav-scrim{
  position: fixed; inset: 0; background: rgba(0,0,0,.5);
  opacity: 0; pointer-events: none; transition: opacity .3s ease; z-index: 998;
}
.nav-scrim.is-open{ opacity: 1; pointer-events: auto; }

/* Last modified: 2026-08-23 20:28:52 +0300 */