/* ===========================================================
   Sakarya Üniversitesi - Öğrenci Bilgi Sistemi (OBİS)
   Tasarım: Kurumsal Lacivert + MADAD palet uyumu (gizli imza)
   =========================================================== */
:root{
  /* MADAD-aligned navy/blue palette (Sakarya kurumsal tonları) */
  --primary:#12213B;         /* madad-navy / Sakarya lacivert */
  --primary-dark:#0A1628;
  --primary-soft:#EAF0F8;
  --secondary:#1F4E79;       /* madad-blue */
  --secondary-soft:#E5EDF5;
  --accent:#C9A227;          /* mat altın detay */
  --text:#1B2330;
  --muted:#666666;           /* madad-gray */
  --line:#E1E6EC;
  --bg:#F4F6F8;              /* madad-light-gray */
  --white:#FFFFFF;
  --success:#268A45;         /* madad-success */
  --warning:#C46A00;         /* madad-warning */
  --danger:#B42318;          /* madad-danger */
  --shadow:0 14px 40px rgba(18,33,59,.08);
  --shadow-sm:0 4px 14px rgba(18,33,59,.06);
  --radius:18px;
  --radius-sm:12px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:"Inter","Segoe UI",-apple-system,BlinkMacSystemFont,Roboto,Arial,sans-serif;background:var(--white);color:var(--text);line-height:1.55}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
body{min-height:100vh}

/* ===== Page Shell ===== */
.page-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh;background:var(--bg)}
.sidebar{background:linear-gradient(180deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;padding:26px 22px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;border-right:1px solid rgba(255,255,255,.05)}
.brand{display:flex;align-items:center;gap:14px;margin-bottom:26px;padding-bottom:22px;border-bottom:1px solid rgba(255,255,255,.10)}
.brand .logo-dot{width:50px;height:50px;border-radius:14px;background:linear-gradient(135deg,var(--secondary) 0%,#2A6BAA 100%);display:grid;place-items:center;font-weight:800;font-size:20px;color:#fff;box-shadow:0 6px 18px rgba(31,78,121,.35);letter-spacing:.5px}
.brand .brand-text small{display:block;opacity:.7;font-size:11px;letter-spacing:.18em;text-transform:uppercase;margin-bottom:3px}
.brand .brand-text strong{display:block;font-size:15px;line-height:1.3;font-weight:700}
.nav-group{display:grid;gap:6px;margin-top:6px}
.nav-link{padding:12px 14px;border-radius:12px;color:rgba(255,255,255,.85);background:transparent;border:1px solid transparent;font-size:14px;font-weight:500;transition:.18s ease;display:flex;align-items:center;gap:10px}
.nav-link:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-link.active{background:rgba(31,78,121,.55);border-color:rgba(255,255,255,.12);color:#fff;font-weight:600}
.sidebar-foot{margin-top:auto;padding-top:22px;font-size:12px;color:rgba(255,255,255,.55);border-top:1px solid rgba(255,255,255,.08);line-height:1.7}

/* ===== Main Content ===== */
.main{padding:30px 34px;background:var(--bg);min-width:0}
.topbar{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px;flex-wrap:wrap;padding-bottom:18px;border-bottom:2px solid var(--line)}
.topbar h1{margin:0;font-size:26px;font-weight:700;color:var(--primary);letter-spacing:-.01em}
.topbar p{margin:6px 0 0;color:var(--muted);font-size:14px}
.badge{display:inline-flex;align-items:center;padding:7px 14px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-weight:700;font-size:12px;letter-spacing:.04em;border:1px solid rgba(18,33,59,.08)}

/* ===== Cards & Grids ===== */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:22px}
.card h3{margin:0 0 16px;font-size:16px;color:var(--primary);font-weight:700;letter-spacing:.01em;padding-bottom:12px;border-bottom:1px solid var(--line)}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:1.2fr .8fr}
.grid-3{grid-template-columns:repeat(3,1fr)}

/* ===== Login ===== */
.login-wrap{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#F4F6F8 0%,#E5EDF5 100%);padding:24px;position:relative;overflow:hidden}
.login-wrap::before{content:"";position:absolute;top:-200px;right:-200px;width:500px;height:500px;border-radius:50%;background:radial-gradient(circle,rgba(31,78,121,.06) 0%,transparent 70%);pointer-events:none}
.login-wrap::after{content:"";position:absolute;bottom:-200px;left:-200px;width:500px;height:500px;border-radius:50%;background:radial-gradient(circle,rgba(18,33,59,.05) 0%,transparent 70%);pointer-events:none}
.login-card{width:min(100%,980px);display:grid;grid-template-columns:1.05fr .95fr;overflow:hidden;background:#fff;border-radius:24px;box-shadow:0 30px 80px rgba(18,33,59,.18);border:1px solid #ECEFF3;position:relative;z-index:1}
.login-side{padding:48px 44px;background:linear-gradient(150deg,var(--primary) 0%,var(--secondary) 100%);color:#fff;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.login-side::after{content:"";position:absolute;top:-100px;right:-100px;width:280px;height:280px;border-radius:50%;background:rgba(255,255,255,.04);pointer-events:none}
.login-side .crest{width:78px;height:78px;border-radius:20px;background:rgba(255,255,255,.10);display:grid;place-items:center;font-size:34px;font-weight:900;border:1px solid rgba(255,255,255,.15);position:relative;z-index:1}
.login-side h1{font-size:30px;line-height:1.2;margin:20px 0 12px;font-weight:700;position:relative;z-index:1}
.login-side p{color:rgba(255,255,255,.82);line-height:1.7;font-size:14px;position:relative;z-index:1}
.login-form{padding:48px 44px;display:flex;flex-direction:column;justify-content:center}
.login-form h2{margin:0 0 8px;font-size:24px;color:var(--primary);font-weight:700}
.login-form .sub{margin:0 0 26px;color:var(--muted);line-height:1.6;font-size:14px}
.login-meta{display:grid;gap:10px;color:rgba(255,255,255,.78);font-size:13px;position:relative;z-index:1}
.login-meta div{padding-left:18px;position:relative}
.login-meta div::before{content:"";position:absolute;left:0;top:8px;width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.55)}

/* ===== Forms ===== */
.field{display:grid;gap:7px;margin-bottom:16px}
label{font-weight:600;font-size:13px;color:var(--text);letter-spacing:.01em}
input,select,textarea{width:100%;border:1.5px solid #D8DDE6;border-radius:12px;padding:12px 14px;font-size:14px;background:#fff;outline:none;transition:.18s ease;font-family:inherit;color:var(--text)}
textarea{min-height:110px;resize:vertical}
input:focus,select:focus,textarea:focus{border-color:var(--secondary);box-shadow:0 0 0 4px rgba(31,78,121,.10)}
input::placeholder{color:#9AA1AC}

/* ===== Buttons ===== */
.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;padding:12px 18px;border:none;border-radius:12px;font-weight:700;cursor:pointer;transition:.18s ease;font-size:14px;font-family:inherit;text-decoration:none;line-height:1}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 12px rgba(18,33,59,.20)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 18px rgba(18,33,59,.28)}
.btn-light{background:#fff;border:1px solid var(--line);color:var(--text)}
.btn-light:hover{background:var(--bg);border-color:var(--secondary)}
.btn-danger{background:var(--danger);color:#fff}
.btn-danger:hover{background:#921C13}
.btn-success{background:var(--success);color:#fff}

/* ===== Tables ===== */
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px;background:#fff}
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left;font-size:13.5px;vertical-align:top}
th{background:#F8FAFC;color:var(--primary);font-weight:700;font-size:12.5px;letter-spacing:.04em;text-transform:uppercase}
tr:last-child td{border-bottom:none}
tr:hover td{background:#FAFBFD}

/* ===== Stats ===== */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;transition:.2s ease}
.stat::before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:linear-gradient(180deg,var(--primary) 0%,var(--secondary) 100%)}
.stat:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.stat span{color:var(--muted);font-size:12px;letter-spacing:.05em;text-transform:uppercase;font-weight:600}
.stat strong{display:block;font-size:28px;margin-top:8px;color:var(--primary);font-weight:800;letter-spacing:-.02em}

/* ===== Key-Value Pairs ===== */
.kv{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.kv .item{padding:13px 15px;border:1px solid var(--line);border-radius:12px;background:#FAFBFD;transition:.18s}
.kv .item:hover{border-color:var(--secondary);background:#fff}
.kv .item span{display:block;color:var(--muted);font-size:11.5px;margin-bottom:5px;letter-spacing:.04em;text-transform:uppercase;font-weight:600}
.kv .item strong{font-size:14px;color:var(--text);font-weight:600}

/* ===== Notes & Alerts ===== */
.note{padding:14px 16px;background:var(--secondary-soft);border-left:4px solid var(--secondary);border-radius:8px;color:var(--primary);font-size:13.5px;margin-top:16px}
.alert{padding:13px 16px;border-radius:12px;margin-bottom:18px;font-size:14px;border:1px solid}
.alert-success{background:#ECFDF3;color:#166534;border-color:#BBF7D0}
.alert-danger{background:#FEF2F2;color:#991B1B;border-color:#FECACA}
.alert-warning{background:#FFFAEB;color:#92400E;border-color:#FDE68A}

/* ===== Media Preview ===== */
.media-preview{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.media-box{border:1px dashed #CFD6E0;border-radius:14px;padding:14px;background:#FAFBFD;display:flex;align-items:center;justify-content:center;min-height:200px}
.media-box img,.media-box iframe{border-radius:10px;width:100%;height:200px;object-fit:cover;background:#F3F4F6}

/* ===== Toolbar & Search ===== */
.toolbar{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-bottom:16px}
.toolbar strong{color:var(--primary);font-size:15px}
.search{max-width:340px;width:100%}
.search input{padding:10px 14px;font-size:13.5px}

/* ===== Misc ===== */
.center{display:grid;place-items:center}
.empty-state{padding:36px;border:1px dashed var(--line);border-radius:14px;background:#fff;text-align:center;color:var(--muted);font-size:14px}
.footer-mini{font-size:11.5px;color:var(--muted);margin-top:22px;text-align:center;letter-spacing:.03em}

/* ===== Hero Logo (Login Side) ===== */
.hero-logo-wrap{width:110px;height:110px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);border-radius:24px;display:flex;align-items:center;justify-content:center;margin-bottom:24px;backdrop-filter:blur(6px);box-shadow:0 12px 28px rgba(0,0,0,.12);position:relative;z-index:1}
.hero-logo{width:78px;height:78px;object-fit:contain;display:block}

/* ===== Responsive ===== */
@media (max-width: 1100px){
  .grid-2,.stats,.grid-3,.kv,.media-preview{grid-template-columns:1fr}
}
@media (max-width: 920px){
  .page-shell{grid-template-columns:1fr}
  .sidebar{position:relative;height:auto}
  .login-card{grid-template-columns:1fr}
}
@media (max-width: 640px){
  .main,.login-form,.login-side{padding:24px}
  .topbar h1{font-size:22px}
  .card,.stat{padding:16px}
  th,td{padding:11px 12px}
}