/* ==========================================================================
   Dilan Güneş — Akademik Site
   Tasarım Sistemi: "Akademik Dosya"
   ========================================================================== */

:root{
  --navy-deep:#1B3A6B;
  --navy-mid:#2C5A9E;
  --cream:#F7F4ED;
  --paper:#FFFFFF;
  --ink-muted:#5C6470;
  --accent-amber:#B8893F;
  --line-hairline:#D8D2C4;
}

*{box-sizing:border-box;}

html{scroll-behavior:smooth;}

body{
  font-family:'Inter', system-ui, sans-serif;
  background:var(--cream);
  color:var(--navy-deep);
  margin:0;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}

/* ---------- Typography helpers ---------- */
.font-serif-display{font-family:'Source Serif 4', Georgia, serif;}
.font-mono-label{font-family:'IBM Plex Mono', ui-monospace, monospace;}

.eyebrow{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.68rem;
  letter-spacing:0.18em;
  text-transform:uppercase;
  color:var(--accent-amber);
  margin:0;
}

.file-number{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.72rem;
  color:var(--ink-muted);
  letter-spacing:0.05em;
  margin:0;
}

/* ---------- Layout shell ---------- */
.layout{display:flex; max-width:1280px; margin:0 auto; min-height:100vh;}

.sidebar{
  width:240px;
  flex-shrink:0;
  padding:3rem 2rem;
  border-right:1px solid var(--line-hairline);
  display:flex;
  flex-direction:column;
  position:sticky;
  top:0;
  height:100vh;
}

.sidebar__logo{
  display:block;
  width:5.5rem;
  margin-bottom:0.25rem;
  text-decoration:none;
}
.sidebar__logo img{display:block; width:100%; height:auto;}

.main{flex:1; padding:3rem 2.5rem; min-width:0;}

/* ---------- Navigation ---------- */
.nav{display:flex; flex-direction:column; gap:1.25rem; margin-top:0.5rem;}

.nav-link{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.78rem;
  letter-spacing:0.04em;
  color:var(--ink-muted);
  text-decoration:none;
  width:fit-content;
  transition:color .15s ease;
}
.nav-link:hover{color:var(--navy-deep);}
.nav-link.active{
  color:var(--navy-deep);
  border-bottom:2px solid var(--accent-amber);
  padding-bottom:3px;
}

.sidebar__footer{
  margin-top:auto;
  padding-top:2.5rem;
  border-top:1px solid var(--line-hairline);
}

/* ---------- Mobile header ---------- */
.mobile-header{
  display:none;
  align-items:center;
  justify-content:space-between;
  padding:1.25rem 1.5rem;
  border-bottom:1px solid var(--line-hairline);
  position:fixed;
  top:0; left:0; right:0;
  background:var(--cream);
  z-index:20;
}
.mobile-header__logo{
  font-family:'Source Serif 4', serif;
  font-size:1.25rem;
  font-weight:600;
  color:var(--navy-deep);
  text-decoration:none;
}
.mobile-menu-btn{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.72rem;
  color:var(--ink-muted);
  background:none;
  border:none;
  cursor:pointer;
}

/* Mobile slide-out nav */
.mobile-nav{
  display:none;
  position:fixed;
  top:0; left:0; right:0; bottom:0;
  background:var(--cream);
  z-index:30;
  padding:5rem 2rem 2rem;
  flex-direction:column;
  gap:1.5rem;
}
.mobile-nav.open{display:flex;}
.mobile-nav .nav-link{font-size:1rem;}
.mobile-nav__close{
  position:absolute;
  top:1.5rem; right:1.5rem;
  font-family:'IBM Plex Mono', monospace;
  font-size:0.8rem;
  background:none; border:none; cursor:pointer;
  color:var(--navy-deep);
}

/* ---------- Cards ---------- */
.card{
  background:var(--paper);
  border:1px solid var(--line-hairline);
  border-radius:2px;
}

/* ---------- Buttons ---------- */
.btn-primary,
.btn-ghost{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.72rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  padding:0.85rem 1.6rem;
  border-radius:2px;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:0.5rem;
  cursor:pointer;
  transition:all .15s ease;
}
.btn-primary{background:var(--navy-deep); color:var(--cream); border:1px solid var(--navy-deep);}
.btn-primary:hover{background:var(--navy-mid); border-color:var(--navy-mid);}
.btn-ghost{background:transparent; border:1px solid var(--navy-deep); color:var(--navy-deep);}
.btn-ghost:hover{background:var(--navy-deep); color:var(--cream);}
.btn-amber{background:var(--accent-amber); color:var(--navy-deep); border:1px solid var(--accent-amber);}
.btn-amber:hover{filter:brightness(1.07);}

/* ---------- Section dividers ---------- */
.section{border-top:1px solid var(--line-hairline); padding-top:4rem; margin-top:4rem;}
.section--first{border-top:none; padding-top:0; margin-top:0;}

.section-title{
  font-family:'Source Serif 4', serif;
  font-size:1.875rem;
  font-weight:600;
  color:var(--navy-deep);
  margin:0;
}

/* ---------- Page header ---------- */
.page-h1{
  font-family:'Source Serif 4', serif;
  font-size:2.75rem;
  font-weight:600;
  color:var(--navy-deep);
  line-height:1.12;
  margin:0;
}
.page-intro{margin-top:0.75rem; max-width:36rem; color:var(--ink-muted);}

/* ---------- Tags ---------- */
.tag{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.62rem;
  letter-spacing:0.06em;
  text-transform:uppercase;
  padding:0.2rem 0.6rem;
  border-radius:2px;
  border:1px solid var(--line-hairline);
  color:var(--ink-muted);
  display:inline-block;
}

/* ---------- Footer ---------- */
.site-footer{
  border-top:1px solid var(--line-hairline);
  padding-top:2rem;
  padding-bottom:1rem;
  margin-top:4rem;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:1rem;
}
.site-footer a{text-decoration:none;}
.site-footer a:hover{text-decoration:underline;}

/* ---------- Tabs ---------- */
.tabs{
  display:flex;
  gap:2rem;
  border-bottom:1px solid var(--line-hairline);
  margin-bottom:2.5rem;
  flex-wrap:wrap;
}
.tab{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.72rem;
  letter-spacing:0.06em;
  text-transform:uppercase;
  padding-bottom:0.75rem;
  cursor:pointer;
  color:var(--ink-muted);
  background:none;
  border:none;
  border-bottom:2px solid transparent;
  transition:color .15s ease;
}
.tab:hover{color:var(--navy-deep);}
.tab.active{color:var(--navy-deep); border-bottom:2px solid var(--accent-amber);}

/* ---------- Form ---------- */
.field{margin-bottom:1.5rem;}
.field-label{
  font-family:'IBM Plex Mono', monospace;
  font-size:0.72rem;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--navy-deep);
  margin-bottom:0.5rem;
  display:block;
}
.field-input{
  width:100%;
  border:1px solid var(--line-hairline);
  background:var(--paper);
  padding:0.85rem 1rem;
  font-family:'Inter', sans-serif;
  font-size:0.95rem;
  color:var(--navy-deep);
  border-radius:2px;
  outline:none;
  transition:border-color .15s ease;
}
.field-input:focus{border-color:var(--accent-amber);}
textarea.field-input{resize:vertical; min-height:140px;}
.field-error{color:#B4452E; font-size:0.8rem; margin-top:0.35rem; font-family:'IBM Plex Mono', monospace;}
.required{color:var(--accent-amber);}

/* ---------- Alerts ---------- */
.alert{
  padding:1rem 1.25rem;
  border-radius:2px;
  margin-bottom:1.5rem;
  font-size:0.9rem;
}
.alert-success{background:#E8F0E4; border:1px solid #B8CCA8; color:#3A5A2E;}
.alert-error{background:#F6E5E0; border:1px solid #D8B0A4; color:#8A3422;}

/* ---------- Utility ---------- */
.muted{color:var(--ink-muted);}
.amber{color:var(--accent-amber);}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .sidebar{display:none;}
  .mobile-header{display:flex;}
  .main{margin-top:4rem; padding:2rem 1.5rem;}
}