/* ===========================================================
   Belentepe — Design System & Shared Styles (Phase 1 prototype)
   =========================================================== */

@font-face {
  font-family: "VAG Rounded";
  src: url("../fonts/VAGRounded-Bold.woff2") format("woff2"),
       url("../fonts/VAGRounded-Bold.ttf") format("truetype");
  font-weight: 700;
  font-display: swap;
}

:root {
  --forest:  #2e4a1c;
  --forest-2:#3a5a24;
  --leaf:    #6fb13b;
  --leaf-2:  #8cc34f;
  --stone:   #5b5b4d;
  --cream:   #f7f5ee;
  --sand:    #eef3e2;
  --ink:     #20231c;
  --white:   #ffffff;
  --shadow:  0 14px 40px rgba(20,35,12,.16);
  --radius:  18px;
  --maxw:    1180px;
  --head: "Poppins", "Trebuchet MS", system-ui, sans-serif;
  --body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--body);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.65;
  font-size: 18px;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--forest); text-decoration: none; }

h1,h2,h3,.h { font-family: var(--head); font-weight: 700; line-height: 1.08; letter-spacing: .2px; color: var(--forest); }
h1 { font-size: clamp(2.4rem, 6vw, 4.6rem); margin: 0 0 .3em; }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); margin: 0 0 .5em; }
h3 { font-size: clamp(1.2rem, 2.4vw, 1.7rem); margin: 0 0 .4em; }
p  { margin: 0 0 1em; }
.lead { font-size: clamp(1.1rem,2.2vw,1.45rem); color: var(--stone); }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.section { padding: clamp(56px, 9vw, 120px) 0; }
.center { text-align: center; }
.muted { color: var(--stone); }
.kicker {
  font-family: var(--head); text-transform: uppercase; letter-spacing: .18em;
  font-size: .8rem; color: var(--leaf); margin: 0 0 .6em;
}
.kicker.on-dark { color: var(--leaf-2); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  font-family: var(--head); font-size: 1rem;
  padding: .85em 1.5em; border-radius: 999px;
  background: var(--leaf); color: #fff; border: 2px solid var(--leaf);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
  cursor: pointer;
}
.btn:hover { background: var(--forest); border-color: var(--forest); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn.ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.7); }
.btn.ghost:hover { background: rgba(255,255,255,.16); border-color:#fff; }
.btn.dark { background: var(--forest); border-color: var(--forest); }
.btn.outline { background: transparent; color: var(--forest); border-color: var(--forest); }
.btn.outline:hover { background: var(--forest); color:#fff; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px clamp(16px,4vw,40px);
  transition: background .3s ease, box-shadow .3s ease, padding .3s ease;
}
.site-header.scrolled { background: rgba(247,245,238,.96); box-shadow: 0 4px 24px rgba(20,35,12,.10); padding-top:10px; padding-bottom:10px; backdrop-filter: blur(6px); }
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 46px; width:auto; }
.brand b { font-family: "VAG Rounded", var(--head); color: var(--forest); font-size: 1.25rem; letter-spacing:.5px; }
.site-header:not(.scrolled) .brand b { color:#fff; text-shadow: 0 2px 10px rgba(0,0,0,.4); }
.site-header:not(.scrolled) .brand img { filter: drop-shadow(0 2px 8px rgba(0,0,0,.45)); }

.nav { display: flex; align-items: center; gap: clamp(10px,2vw,26px); }
.nav a.navlink {
  font-family: var(--head); font-size: .98rem; color: var(--forest);
  position: relative; padding: 4px 2px;
}
.site-header:not(.scrolled) .nav a.navlink { color:#fff; text-shadow: 0 2px 10px rgba(0,0,0,.5); }
.nav a.navlink::after { content:""; position:absolute; left:0; bottom:-3px; height:2px; width:0; background: var(--leaf); transition: width .25s ease; }
.nav a.navlink:hover::after { width:100%; }

.lang-toggle {
  display:flex; border:2px solid currentColor; border-radius:999px; overflow:hidden;
  font-family: var(--head); font-size:.82rem; color: var(--forest);
}
.site-header:not(.scrolled) .lang-toggle { color:#fff; }
.lang-toggle button { background:none; border:0; color:inherit; padding:.35em .7em; cursor:pointer; font:inherit; }
.lang-toggle button.active { background: var(--leaf); color:#fff; }

.menu-btn { display:none; background:none; border:0; cursor:pointer; padding:8px; }
.menu-btn span { display:block; width:26px; height:3px; background: var(--forest); margin:5px 0; border-radius:3px; transition:.3s; }
.site-header:not(.scrolled) .menu-btn span { background:#fff; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh; display:flex; align-items:center;
  color:#fff; text-align:center; overflow:hidden;
}
.hero .bg { position:absolute; inset:0; background-size:cover; background-position:center; transform: scale(1.06); }
.hero .bg::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(20,35,12,.45) 0%, rgba(20,35,12,.25) 40%, rgba(20,35,12,.6) 100%); }
.hero .inner { position:relative; z-index:2; max-width: 900px; margin:0 auto; padding: 0 22px; }
.hero h1 { color:#fff; text-shadow: 0 4px 30px rgba(0,0,0,.45); }
.hero .lead { color: rgba(255,255,255,.94); text-shadow: 0 2px 18px rgba(0,0,0,.5); }
.hero .cta-row { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-top: 28px; }
.scroll-hint { position:absolute; bottom:26px; left:50%; transform:translateX(-50%); z-index:2; color:#fff; font-size:.8rem; font-family:var(--head); letter-spacing:.15em; opacity:.85; }
.scroll-hint::before { content:""; display:block; width:22px; height:34px; border:2px solid #fff; border-radius:12px; margin:0 auto 8px; position:relative; }
.scroll-hint::after { content:""; position:absolute; top:7px; left:50%; transform:translateX(-50%); width:4px; height:7px; background:#fff; border-radius:2px; animation: scrolldot 1.6s infinite; }
@keyframes scrolldot { 0%{opacity:0;transform:translate(-50%,0)} 30%{opacity:1} 100%{opacity:0;transform:translate(-50%,12px)} }

/* ---------- Message band ---------- */
.message {
  background: var(--forest); color:#fff; text-align:center;
}
.message h2 { color:#fff; }
.message .big { font-family:var(--head); font-size: clamp(1.5rem,3.6vw,2.6rem); line-height:1.25; max-width: 900px; margin:0 auto; }
.message .big em { color: var(--leaf-2); font-style: normal; }

/* ---------- Feature paths (3 cards) ---------- */
.paths { display:grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.path-card {
  position:relative; border-radius: var(--radius); overflow:hidden; min-height: 360px;
  display:flex; align-items:flex-end; color:#fff; box-shadow: var(--shadow);
  isolation:isolate;
}
.path-card .img { position:absolute; inset:0; background-size:cover; background-position:center; transition: transform .6s ease; z-index:-2; }
.path-card::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(20,35,12,0) 30%, rgba(20,35,12,.82) 100%); z-index:-1; }
.path-card:hover .img { transform: scale(1.08); }
.path-card .body { padding: 26px; }
.path-card h3 { color:#fff; margin-bottom:.2em; }
.path-card p { color: rgba(255,255,255,.9); margin:0 0 .8em; font-size:.98rem; }
.path-card .more { font-family:var(--head); color: var(--leaf-2); font-size:.95rem; }

/* ---------- Split feature rows ---------- */
.split { display:grid; grid-template-columns: 1fr 1fr; gap: clamp(28px,5vw,64px); align-items:center; }
.split.rev .media { order:2; }
.split .media img { border-radius: var(--radius); box-shadow: var(--shadow); width:100%; aspect-ratio: 4/3; object-fit:cover; }

/* ---------- Stats ---------- */
.stats { display:grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.stat { text-align:center; padding: 18px; }
.stat .num { font-family:var(--head); font-size: clamp(2rem,5vw,3.2rem); color: var(--leaf); line-height:1; }
.stat .lbl { color: var(--stone); font-size:.95rem; margin-top:.4em; }

/* ---------- Topics grid ---------- */
.topics { display:grid; grid-template-columns: repeat(3,1fr); gap:18px; }
.topic {
  position:relative; border-radius:14px; overflow:hidden; min-height:220px; color:#fff;
  display:flex; align-items:flex-end; box-shadow: var(--shadow); isolation:isolate;
}
.topic .img { position:absolute; inset:0; background-size:cover; background-position:center; z-index:-2; transition: transform .6s ease;}
.topic::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg,rgba(0,0,0,0) 40%, rgba(20,35,12,.8)); z-index:-1; }
.topic:hover .img { transform:scale(1.08); }
.topic span { font-family:var(--head); padding:18px; font-size:1.15rem; }

/* ---------- News / cards ---------- */
.cards { display:grid; grid-template-columns: repeat(3,1fr); gap:22px; }
.card { background:#fff; border-radius:14px; overflow:hidden; box-shadow: var(--shadow); display:flex; flex-direction:column; }
.card .ph { aspect-ratio:16/9; background-size:cover; background-position:center; }
.card .c { padding:18px; }
.card h3 { font-size:1.15rem; }
.card .tag { font-family:var(--head); color:var(--leaf); font-size:.78rem; text-transform:uppercase; letter-spacing:.12em; }

/* ---------- Tools / apps band ---------- */
.band-soft { background: var(--sand); }
.apps { display:grid; grid-template-columns:1fr 1fr; gap:22px; }
.app { background:#fff; border-radius:var(--radius); padding:28px; box-shadow:var(--shadow); }
.app h3 { margin-bottom:.2em; }

/* ---------- Footer ---------- */
.site-footer { background: var(--forest); color: rgba(255,255,255,.86); padding: 60px 0 30px; }
.site-footer a { color: rgba(255,255,255,.86); }
.site-footer a:hover { color:#fff; }
.foot-grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap:30px; }
.site-footer h4 { font-family:var(--head); color:#fff; margin:0 0 .8em; font-size:1.05rem; }
.site-footer ul { list-style:none; padding:0; margin:0; }
.site-footer li { margin:.4em 0; }
.social { display:flex; gap:12px; margin-top:12px; }
.social a { width:38px; height:38px; border-radius:50%; background:rgba(255,255,255,.12); display:grid; place-items:center; transition:.25s; }
.social a:hover { background: var(--leaf); }
.social svg { width:18px; height:18px; fill:#fff; }
.foot-bottom { border-top:1px solid rgba(255,255,255,.16); margin-top:40px; padding-top:20px; font-size:.85rem; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; }

/* ---------- Newsletter ---------- */
.newsletter { display:flex; gap:10px; max-width:480px; margin-top:14px; flex-wrap:wrap; }
.newsletter input { flex:1; min-width:200px; padding:.8em 1em; border-radius:999px; border:1px solid rgba(255,255,255,.3); background:rgba(255,255,255,.1); color:#fff; font:inherit; }
.newsletter input::placeholder { color:rgba(255,255,255,.6); }

/* ---------- Reveal animations ---------- */
.reveal { opacity:0; transform: translateY(34px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity:1; transform:none; }
.reveal.d1{transition-delay:.1s}.reveal.d2{transition-delay:.2s}.reveal.d3{transition-delay:.3s}

/* ---------- i18n visibility ---------- */
[data-en]{ display:none; }
html[lang="en"] [data-en]{ display:revert; }
html[lang="en"] [data-tr]{ display:none; }

/* ---------- Mobile nav ---------- */
@media (max-width: 900px){
  .nav { position:fixed; inset:0 0 0 auto; width:min(82vw,340px); background:var(--forest);
    flex-direction:column; align-items:flex-start; justify-content:center; gap:22px; padding:40px;
    transform: translateX(100%); transition: transform .35s ease; box-shadow:var(--shadow); }
  .nav.open { transform:none; }
  .nav a.navlink, .site-header:not(.scrolled) .nav a.navlink { color:#fff; text-shadow:none; font-size:1.3rem; }
  .nav a.navlink::after{ background: var(--leaf-2); }
  .lang-toggle, .site-header:not(.scrolled) .lang-toggle { color:#fff; }
  .menu-btn { display:block; z-index:60; }
  .menu-btn.open span:nth-child(1){ transform:translateY(8px) rotate(45deg); background:#fff;}
  .menu-btn.open span:nth-child(2){ opacity:0; }
  .menu-btn.open span:nth-child(3){ transform:translateY(-8px) rotate(-45deg); background:#fff;}
}
@media (max-width: 860px){
  .paths,.topics,.cards { grid-template-columns:1fr; }
  .split,.apps { grid-template-columns:1fr; }
  .split.rev .media{ order:0; }
  .stats { grid-template-columns: repeat(2,1fr); }
  .foot-grid { grid-template-columns:1fr 1fr; }
}
@media (max-width:480px){ .foot-grid{ grid-template-columns:1fr; } }

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