/* =============================================================
   هفتمین کنفرانس بین‌المللی پداگوژی و اسپرانتولوژی
   7-a Internacia Konferenco pri Pedagogio kaj Esperantologio
   style.css  —  Bilingual (fa RTL / eo LTR) single-page website
   Palette: Teal/Cyan = Esperantology | Gold/Amber = Pedagogy
   ============================================================= */

/* ---------- 1. Design tokens ---------- */
:root{
  --teal-900:#0b3b40;
  --teal-700:#0f5f66;
  --teal-600:#12757d;
  --teal-500:#1a8f94;
  --teal-100:#e2f4f4;
  --gold-700:#9a6b0c;
  --gold-600:#b8860b;
  --gold-500:#d4a017;
  --gold-100:#fdf3dc;
  --ink:#1d2730;
  --muted:#5b6b78;
  --bg:#f7f9fa;
  --surface:#ffffff;
  --border:#e1e8ec;
  --radius:16px;
  --shadow-sm:0 2px 8px rgba(11,59,64,.06);
  --shadow-md:0 10px 30px rgba(11,59,64,.10);
  --font-fa:Tahoma,"Segoe UI",Arial,sans-serif;
  --font-eo:"Georgia","Times New Roman",serif;
  --header-h:72px;
}

/* ---------- 2. Reset / base ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 10px);}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-fa);
  font-size:16px;
  line-height:1.9;
  transition:direction .3s,font-family .3s;
}
img{max-width:100%;display:block;}
a{color:var(--teal-600);text-decoration:none;}
a:hover{text-decoration:underline;}
h1,h2,h3,h4{line-height:1.45;margin:0 0 .6rem;}
ul{margin:.4rem 0;padding-inline-start:1.4rem;}
.container{width:min(1160px,92%);margin-inline:auto;}

/* ---------- 3. Language visibility ---------- */
/* Persian is the default language: html.lang-fa shows .fa, hides .eo */
html.lang-fa .eo{display:none !important;}
html.lang-eo .fa{display:none !important;}

/* When Esperanto is active the whole document becomes LTR + serif */
html.lang-eo body{
  direction:ltr;
  text-align:left;
  font-family:var(--font-eo);
  font-size:17px;
}
html.lang-fa body{direction:rtl;text-align:right;}

/* Smooth fade used when switching language */
body.lang-switching .lang-block{opacity:0;transition:opacity .18s ease;}
body.lang-switching{border-color:transparent;}
body.lang-switching .lang-block{opacity:0;}
body.lang-switching.done-switch .lang-block{opacity:1;transition:opacity .22s ease;}

/* ---------- 4. Header / navigation ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  height:var(--header-h);
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow-sm);
}
.header-inner{display:flex;align-items:center;gap:1rem;height:100%;}
.brand{display:flex;align-items:center;gap:.6rem;flex:1;min-width:0;}
.brand img{height:44px;width:auto;flex:none;}
.brand-text{min-width:0;}
.brand-text strong{display:block;font-size:.95rem;color:var(--teal-900);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:46ch;}
.brand-text span{display:block;font-size:.72rem;color:var(--muted);letter-spacing:.02em;}

.main-nav ul{display:flex;gap:.15rem;list-style:none;margin:0;padding:0;}
.main-nav a{
  display:block;padding:.45rem .65rem;border-radius:10px;
  font-size:.82rem;color:var(--ink);white-space:nowrap;
  transition:background .2s,color .2s;
}
.main-nav a:hover{background:var(--teal-100);color:var(--teal-700);text-decoration:none;}
.main-nav a.active{background:var(--teal-600);color:#fff;}

/* language toggle button (header based) */
.lang-toggle{
  border:2px solid var(--teal-600);background:#fff;color:var(--teal-700);
  border-radius:999px;padding:.35rem .95rem;font:inherit;font-size:.8rem;
  cursor:pointer;white-space:nowrap;transition:all .2s;
  display:inline-flex;align-items:center;gap:.35rem;
}
.lang-toggle:hover{background:var(--teal-600);color:#fff;}
.lang-toggle .globe{font-size:.95rem;}

/* hamburger */
.nav-toggle{
  display:none;background:none;border:0;cursor:pointer;padding:.4rem;
  width:44px;height:44px;
}
.nav-toggle span{
  display:block;height:3px;background:var(--teal-900);border-radius:2px;
  margin:5px 0;transition:transform .3s,opacity .3s;
}
.nav-toggle.open span:nth-child(1){transform:translateY(8px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg);}

/* ---------- 5. Hero slider ---------- */
.hero{position:relative;height:clamp(420px,68vh,620px);overflow:hidden;background:var(--teal-900);}
.slide{
  position:absolute;inset:0;opacity:0;transition:opacity .9s ease;
  display:flex;align-items:center;justify-content:center;
}
.slide.active{opacity:1;z-index:2;}
.slide-bg{position:absolute;inset:0;background-size:cover;background-position:center;}
.slide-1 .slide-bg{
  background:
    radial-gradient(circle at 78% 22%,rgba(26,143,148,.55),transparent 55%),
    radial-gradient(circle at 18% 80%,rgba(212,160,23,.35),transparent 55%),
    linear-gradient(135deg,#072a2e 0%,#0f5f66 55%,#12757d 100%);
}
.slide-2 .slide-bg{
  background:
    radial-gradient(circle at 22% 28%,rgba(212,160,23,.5),transparent 50%),
    radial-gradient(circle at 85% 75%,rgba(26,143,148,.4),transparent 55%),
    linear-gradient(120deg,#0b3b40 0%,#235e2f 100%);
}
.slide-3 .slide-bg{background:linear-gradient(120deg,rgba(11,59,64,.85),rgba(11,59,64,.35));}
.slide-3{background:#0b3b40 url("assets/image-(12).webp") center/contain no-repeat;}
.slide-3 .slide-bg{background:linear-gradient(90deg,rgba(11,59,64,.92) 0%,rgba(11,59,64,.55) 45%,rgba(11,59,64,.1) 100%);}
.slide-content{
  position:relative;z-index:3;width:min(1160px,92%);color:#fff;
  text-shadow:0 2px 18px rgba(0,0,0,.35);
}
html.lang-fa .slide-content{text-align:right;}
html.lang-eo .slide-content{text-align:left;}
.slide-eyebrow{
  display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);
  padding:.2rem .8rem;border-radius:999px;font-size:.78rem;letter-spacing:.04em;margin-bottom:.9rem;
}
.slide h1{font-size:clamp(1.5rem,3.6vw,2.6rem);max-width:24ch;margin-bottom:.8rem;}
.slide p{font-size:clamp(.95rem,1.6vw,1.15rem);max-width:52ch;margin:0 0 1.4rem;opacity:.95;}
html.lang-fa .slide h1,html.lang-fa .slide p{margin-inline-start:auto;}
html.lang-eo .slide h1,html.lang-eo .slide p{margin-inline-end:auto;}
.btn{
  display:inline-block;padding:.6rem 1.35rem;border-radius:999px;
  font-size:.9rem;font-weight:700;text-decoration:none;transition:all .2s;
}
.btn-primary{background:var(--gold-500);color:#2b1c00;}
.btn-primary:hover{background:#e9b73a;text-decoration:none;}
.btn-ghost{border:2px solid #fff;color:#fff;margin-inline-start:.5rem;}
.btn-ghost:hover{background:#fff;color:var(--teal-900);text-decoration:none;}

.slider-dots{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);z-index:5;display:flex;gap:.5rem;}
.slider-dots button{
  width:12px;height:12px;border-radius:50%;border:2px solid #fff;
  background:transparent;cursor:pointer;padding:0;transition:background .2s;
}
.slider-dots button.active{background:var(--gold-500);border-color:var(--gold-500);}
.slider-arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:5;
  width:44px;height:44px;border-radius:50%;border:0;cursor:pointer;
  background:rgba(255,255,255,.2);color:#fff;font-size:1.4rem;line-height:1;
  display:grid;place-items:center;transition:background .2s;
}
.slider-arrow:hover{background:rgba(255,255,255,.4);}
.slider-arrow.prev{inset-inline-start:16px;}
.slider-arrow.next{inset-inline-end:16px;}

/* ---------- 6. Sections ---------- */
.section{padding:4.2rem 0;scroll-margin-top:var(--header-h);}
.section:nth-of-type(even){background:var(--surface);}
.section-head{max-width:780px;margin:0 auto 2.4rem;}
html.lang-fa .section-head{text-align:center;}
html.lang-eo .section-head{text-align:center;}
.section-head .kicker{
  display:inline-block;font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--teal-600);font-weight:700;margin-bottom:.4rem;
}
.section-head h2{font-size:clamp(1.35rem,2.6vw,1.95rem);color:var(--teal-900);}
.section-head p{color:var(--muted);margin:.3rem 0 0;}
.title-line{width:64px;height:4px;border-radius:2px;margin:.9rem auto 0;
  background:linear-gradient(90deg,var(--teal-600),var(--gold-500));}

/* cards grid */
.grid{display:grid;gap:1.3rem;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.4rem 1.5rem;box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);}
.card h3{color:var(--teal-700);font-size:1.05rem;display:flex;align-items:center;gap:.5rem;}
.card h3 .ico{font-size:1.2rem;}
.card ul{padding-inline-start:1.2rem;color:var(--muted);}
.card p{color:var(--muted);margin:.2rem 0;}

/* committee color coding */
.card.teal{border-top:5px solid var(--teal-500);}
.card.teal h3{color:var(--teal-700);}
.card.gold{border-top:5px solid var(--gold-500);}
.card.gold h3{color:var(--gold-700);}
.tag{display:inline-block;font-size:.7rem;padding:.1rem .55rem;border-radius:999px;font-weight:700;}
.tag-teal{background:var(--teal-100);color:var(--teal-700);}
.tag-gold{background:var(--gold-100);color:var(--gold-700);}

/* ---------- 7. Intro / home ---------- */
.intro-layout{display:grid;grid-template-columns:1.4fr .9fr;gap:2rem;align-items:start;}
.intro-text p{color:#37454f;text-align:justify;}
html.lang-eo .intro-text p{text-align:justify;hyphens:auto;}
.stat-panel{
  background:linear-gradient(150deg,var(--teal-900),var(--teal-600));
  color:#fff;border-radius:var(--radius);padding:1.6rem;box-shadow:var(--shadow-md);
}
.stat-panel h3{color:#fff;font-size:1rem;border-bottom:1px solid rgba(255,255,255,.25);padding-bottom:.6rem;}
.stat-panel dl{display:grid;grid-template-columns:1fr 1fr;gap:.9rem;margin:0;}
.stat-panel dt{font-size:.75rem;opacity:.8;}
.stat-panel dd{margin:0;font-size:1.05rem;font-weight:700;color:var(--gold-500);}

/* ---------- 8. Timeline ---------- */
.timeline{position:relative;max-width:820px;margin-inline:auto;padding:0;list-style:none;}
.timeline::before{
  content:"";position:absolute;inset-block:0;inset-inline-start:22px;width:4px;border-radius:2px;
  background:linear-gradient(var(--teal-500),var(--gold-500));
}
.timeline li{position:relative;padding-inline-start:64px;padding-bottom:1.6rem;}
.timeline li:last-child{padding-bottom:0;}
.timeline .dot{
  position:absolute;inset-inline-start:11px;top:6px;width:26px;height:26px;border-radius:50%;
  background:#fff;border:5px solid var(--teal-500);box-sizing:border-box;
}
.timeline li:nth-child(even) .dot{border-color:var(--gold-500);}
.timeline h3{font-size:1rem;margin-bottom:.1rem;color:var(--teal-900);}
.timeline .when{
  display:inline-block;font-size:.78rem;font-weight:700;color:var(--teal-700);
  background:var(--teal-100);padding:.1rem .6rem;border-radius:999px;margin-bottom:.25rem;
}
.timeline li:nth-child(even) .when{color:var(--gold-700);background:var(--gold-100);}
.timeline p{margin:0;color:var(--muted);font-size:.92rem;}

/* ---------- 9. Organizational structure ---------- */
.org-block{margin-bottom:2rem;}
.org-block > h3{
  font-size:1.05rem;color:var(--teal-900);display:flex;align-items:center;gap:.5rem;margin-bottom:1rem;
}
.org-block > h3::before{content:"";width:8px;height:22px;border-radius:3px;background:var(--teal-600);}
.org-block.gold > h3::before{background:var(--gold-500);}
.person-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.1rem 1.2rem;display:flex;gap:.9rem;align-items:center;box-shadow:var(--shadow-sm);
}
.person-card .avatar{
  flex:none;width:48px;height:48px;border-radius:50%;display:grid;place-items:center;
  font-weight:700;font-size:1rem;color:#fff;background:var(--teal-600);
}
.person-card.gold .avatar{background:var(--gold-500);color:#2b1c00;}
.person-card strong{display:block;font-size:.95rem;color:var(--ink);}
.person-card small{color:var(--muted);font-size:.78rem;}

/* ---------- 10. Poster & Civilica ---------- */
.media-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center;}
.poster-frame{
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  background:#fff;box-shadow:var(--shadow-md);cursor:zoom-in;
}
.poster-frame img{width:100%;height:auto;}
.civilica-card{
  background:#fff;border:1px solid #cfe0f5;border-radius:var(--radius);padding:1.4rem;
  box-shadow:var(--shadow-sm);display:flex;gap:1rem;align-items:center;
}
.civilica-card img{width:130px;flex:none;}
.civilica-card p{color:var(--muted);margin:0;font-size:.92rem;}
.badge-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem;}
.badge{
  font-size:.78rem;padding:.25rem .8rem;border-radius:999px;background:var(--gold-100);
  color:var(--gold-700);border:1px solid #f0dfb4;
}

/* lightbox for the poster */
.lightbox{
  position:fixed;inset:0;z-index:200;background:rgba(6,25,28,.92);
  display:none;align-items:center;justify-content:center;padding:2rem;cursor:zoom-out;
}
.lightbox.open{display:flex;}
.lightbox img{max-height:92vh;max-width:92vw;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5);}

/* ---------- 11. Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.3rem;}
.contact-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.3rem 1.4rem;box-shadow:var(--shadow-sm);
}
.contact-card .ico{font-size:1.5rem;}
.contact-card a{font-size:1.05rem;font-weight:700;direction:ltr;display:inline-block;}
.contact-card small{display:block;color:var(--muted);}

/* ---------- 12. Footer ---------- */
.site-footer{
  background:var(--teal-900);color:#cfe4e6;padding:2.2rem 0 1.2rem;margin-top:0;
}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:1.6rem;}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:.6rem;}
.site-footer a{color:var(--gold-500);}
.site-footer ul{list-style:none;padding:0;margin:0;font-size:.85rem;}
.site-footer li{margin-bottom:.35rem;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.15);margin-top:1.6rem;padding-top:.9rem;
  font-size:.78rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;opacity:.85;
}

/* back-to-top */
.to-top{
  position:fixed;inset-inline-end:18px;bottom:18px;z-index:90;
  width:46px;height:46px;border-radius:50%;border:0;cursor:pointer;
  background:var(--teal-600);color:#fff;font-size:1.2rem;display:none;
  box-shadow:var(--shadow-md);
}
.to-top.show{display:grid;place-items:center;}

/* ---------- 13. Responsive ---------- */
@media (max-width:1024px){
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .intro-layout,.media-layout{grid-template-columns:1fr;}
  .brand-text strong{max-width:28ch;}
}
@media (max-width:860px){
  :root{--header-h:64px;}
  .nav-toggle{display:block;order:2;}
  .lang-toggle{order:1;font-size:.75rem;padding:.3rem .7rem;}
  .main-nav{
    position:fixed;top:var(--header-h);inset-inline:0;background:#fff;
    border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);
    max-height:0;overflow:hidden;transition:max-height .35s ease;
  }
  .main-nav.open{max-height:80vh;overflow:auto;}
  .main-nav ul{flex-direction:column;padding:.6rem;gap:.15rem;}
  .main-nav a{padding:.65rem .9rem;font-size:.92rem;border-radius:8px;}
  .grid-2,.grid-3,.contact-grid,.footer-grid{grid-template-columns:1fr;}
  .brand img{height:36px;}
  .brand-text strong{font-size:.8rem;max-width:20ch;}
  .brand-text span{display:none;}
  .hero{height:clamp(380px,72vh,560px);}
  .slide h1{max-width:100%;}
  .section{padding:3rem 0;}
  .timeline li{padding-inline-start:52px;}
  .civilica-card{flex-direction:column;text-align:center;}
}
@media (max-width:480px){
  .slider-arrow{display:none;}
  .btn-ghost{margin-inline-start:0;margin-top:.4rem;}
  .stat-panel dl{grid-template-columns:1fr;}
}

/* ---------- 14. Accessibility / motion ---------- */
:focus-visible{outline:3px solid var(--gold-500);outline-offset:2px;}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important;}
}

/* ---------- 15. Print ---------- */
@media print{
  .site-header,.slider-arrow,.slider-dots,.to-top,.lang-toggle{display:none !important;}
  .slide{position:static;opacity:1;}
  .hero{height:auto;color:#000;background:#fff;}
  body{background:#fff;}
}