/* ===========================================
   National A.I Company – Login (ROBO – Readable)
   Kontrast & tipografi iyileştirmeleri
   =========================================== */

   *,
   *::before,
   *::after { box-sizing: border-box; }
   
   :root{
     /* Açık tema (varsayılan) */
     --bg: #f5f6f7;
     --bg-2: #eef0f3cc;
     --panel: #ffffff;
     --text: #0b0b0c;       /* 18:1 kontrast hedefi */
     --muted: #4b5563;      /* slate-600 */
     --border: #e6e7ea;
   
     /* Marka / vurgu (monokrom + hafif mor vurgusu) */
     --brand-a: #111217;
     --brand-b: #2a2c35;
     --brand-c: #8f83a0;    /* buton sonu için yumuşak vurgu */
   
     --ok: #16a34a;
     --error: #ef4444;
   
     --radius: 18px;
     --shadow: 0 24px 60px rgba(13, 16, 23, .14);
     --ring: 0 0 0 4px rgba(143,131,160,.28);
     --transition: 180ms ease;
     --font: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans";
   }
   
   @media (prefers-color-scheme: dark){
     :root{
       --bg: #0a0b0e;
       --bg-2: #0d0f13cc;
       --panel: #171a20;    /* kart rengi bir tık aydınlık */
       --text: #f3f4f6;     /* daha parlak metin */
       --muted: #c7c9d1;    /* placeholder/yardım metni */
       --border: #232734;
       --shadow: 0 24px 64px rgba(0,0,0,.55);
       --ring: 0 0 0 3px rgba(143,131,160,.42);
     }
   }
   
   html, body { height: 100%; }
   body { margin: 0; font-family: var(--font); color: var(--text); font-size: 16px; }
   
   .login-body{
     min-height: 100%;
     display: grid;
     place-items: center;
     background:
       radial-gradient(1100px 560px at 88% -8%, color-mix(in oklab, var(--brand-b) 10%, #fff 90%), transparent 60%),
       radial-gradient(1000px 620px at -10% 100%, color-mix(in oklab, var(--brand-a) 10%, #fff 90%), transparent 60%),
       linear-gradient(180deg, var(--bg), #ffffff);
     padding: 28px;
     position: relative;
     isolation: isolate;
   }
   .login-body::after{
     content:"";
     position:absolute; inset:0;
     background:
       linear-gradient(0deg, rgba(90,95,110,.06) 1px, transparent 1px),
       linear-gradient(90deg, rgba(90,95,110,.06) 1px, transparent 1px);
     background-size: 36px 36px;        /* grid daha seyrek */
     opacity: .6;                        /* grid daha silik */
     pointer-events:none;
     z-index:-1;
   }
   
   /* === Container === */
   .login-container{
     width: 100%;
     max-width: 520px;                   /* bir tık geniş */
     background: var(--panel);
     border: 1px solid var(--border);
     border-radius: var(--radius);
     box-shadow: var(--shadow);
     padding: 36px 32px 28px;            /* iç boşluk arttı */
     backdrop-filter: blur(8px);
     -webkit-backdrop-filter: blur(8px);
     animation: pop var(--transition);
   }
   
   @keyframes pop{
     from{ opacity: 0; transform: translateY(8px) scale(.985); }
     to{   opacity: 1; transform: translateY(0)    scale(1); }
   }
   
   /* === Logo === */
   .logo-box{
     display: flex;
     justify-content: center;
     margin-bottom: 4px;
   }
   .logo-img{
     height: 78px;
     width: auto;
     object-fit: contain;
     filter: drop-shadow(0 8px 16px rgba(0,0,0,.18));
   }
   
   /* === Başlık === */
   .login-container h2{
     text-align: center;
     margin: 10px 0 22px;
     font-size: 28px;                    /* daha büyük */
     font-weight: 800;
     letter-spacing: .2px;
     background: linear-gradient(90deg, var(--brand-a), var(--brand-b));
     -webkit-background-clip: text;
     background-clip: text;
     color: transparent;
   }
   
   /* === Hata kutusu === */
   .error{
     margin: 0 0 16px;
     padding: 12px 14px;
     background: rgba(239, 68, 68, .10);
     color: #b91c1c;
     border: 1px solid rgba(239, 68, 68, .28);
     border-radius: 12px;
     font-size: 14px;
     line-height: 1.35;
   }
   
   /* === Form === */
   form{
     display: grid;
     gap: 14px;
   }
   
   input[type="text"],
   input[type="password"]{
     width: 100%;
     padding: 14px 16px;
     border-radius: 12px;
     border: 1px solid var(--border);
     background: #ffffff;
     color: #0b0b0c;
     outline: none;
     font-size: 16px;
     line-height: 1.2;
     transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
     box-shadow: 0 2px 0 rgba(0,0,0,.02) inset; /* kenar belirginliği */
   }
   input::placeholder{ color: color-mix(in oklab, var(--muted) 85%, #000 15%); }
   input:focus{
     border-color: #9f8cab;
     box-shadow: 0 0 0 4px rgba(159,140,171,.22);
     background: #fff;
   }
   
   /* === Buton (daha yüksek kontrast) === */
   button[type="submit"]{
     appearance: none;
     border: 0;
     border-radius: 12px;
     padding: 13px 18px;
     font-weight: 800;
     font-size: 15px;
     cursor: pointer;
     color: #fff;
     background: linear-gradient(90deg, #111217 0%, #1b1d24 55%, #8f83a0 100%);
     transition: transform var(--transition), box-shadow var(--transition), filter var(--transition), opacity var(--transition);
     box-shadow: 0 16px 30px rgba(0,0,0,.28);
   }
   button[type="submit"]:hover{ filter: brightness(1.06); }
   button[type="submit"]:active{ transform: translateY(1px); }
   button[type="submit"]:focus-visible{ box-shadow: 0 0 0 4px rgba(159,140,171,.33); }
   button[disabled]{ opacity: .75; cursor: not-allowed; }
   
   /* === Alt yardım metni === */
   .helper{
     margin-top: 12px;
     text-align: center;
     color: var(--muted);
     font-size: 14px;                    /* okunurluk için +1px */
   }
   .helper a{
     color: #111217;
     text-decoration: underline;
     font-weight: 700;
   }
   @media (prefers-color-scheme: dark){
     .helper a{ color: #e9e7ff; text-decoration-color: rgba(233,231,255,.6); }
   }
   
   /* === Responsive === */
   @media (max-width: 520px){
     .login-container{ padding: 26px 18px 20px; border-radius: 14px; }
     .logo-img{ height: 68px; }
   }
   
   @media (prefers-reduced-motion: reduce){
     * { animation: none !important; transition: none !important; }
   }