:root { --nexus-accent: #4f46e5; --nexus-accent-hover: #4338ca; --nexus-dark: #0f172a; --nexus-gray: #64748b; --nexus-text: #334155; }
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, sans-serif; }
body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%); color: var(--nexus-text); }

.auth-container { width: 1000px; height: 600px; background: white; border-radius: 20px; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); display: flex; overflow: hidden; position: relative; }
.auth-left { flex: 1.2; background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%); color: white; padding: 50px; display: flex; flex-direction: column; justify-content: space-between; position: relative; overflow: hidden; }
.auth-left::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 60%); animation: pulse 15s infinite; }
@keyframes pulse { 0% { transform: scale(1); } 50% { transform: scale(1.1); } 100% { transform: scale(1); } }
.brand-logo { font-size: 28px; font-weight: 800; display: flex; align-items: center; gap: 12px; z-index: 2;}
.brand-logo i { color: #6366f1; font-size: 32px; }
.brand-logo span { color: #38bdf8; font-weight: 300; }
.hero-text { z-index: 2; margin-bottom: 40px;}
.hero-text h1 { font-size: 36px; line-height: 1.2; margin-bottom: 20px; font-weight: 700; color: #f8fafc; }
.hero-text p { font-size: 15px; line-height: 1.6; color: #94a3b8; font-weight: 400; max-width: 85%; }
.system-status { z-index: 2; display: flex; align-items: center; gap: 10px; background: rgba(255,255,255,0.05); padding: 10px 15px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.1); width: fit-content;}
.status-dot { width: 10px; height: 10px; background: #10b981; border-radius: 50%; box-shadow: 0 0 10px #10b981; animation: blink 2s infinite; }
@keyframes blink { 0% { opacity: 1; } 50% { opacity: 0.4; } 100% { opacity: 1; } }
.system-status span { font-size: 12px; font-weight: 600; color: #cbd5e1; }

.auth-right { flex: 1; padding: 50px 60px; display: flex; flex-direction: column; justify-content: center; position: relative; background: #ffffff; }
.form-wrapper { position: relative; width: 100%; height: 400px; display: flex; align-items: center; overflow: hidden; }
.auth-form { width: 100%; position: absolute; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); opacity: 0; pointer-events: none; transform: translateX(50px); }
.auth-form.active { opacity: 1; pointer-events: auto; transform: translateX(0); z-index: 5; }
.auth-form.slide-out { transform: translateX(-50px); opacity: 0; pointer-events: none; }
.auth-title { font-size: 24px; font-weight: 800; color: var(--nexus-dark); margin-bottom: 8px; }
.auth-subtitle { font-size: 13px; color: var(--nexus-gray); margin-bottom: 30px; font-weight: 500; }
.input-group { position: relative; margin-bottom: 20px; width: 100%; }
.icon-left { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: #94a3b8; font-size: 16px; z-index: 2;}
.password-toggle { position: absolute; right: 16px; top: 50%; transform: translateY(-50%); color: #94a3b8; cursor: pointer; font-size: 15px; z-index: 2; padding: 5px;}
.auth-input { width: 100%; height: 48px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 0 45px; font-size: 14px; font-weight: 600; color: var(--nexus-dark); outline: none; transition: all 0.3s; }
.auth-input:focus { border-color: var(--nexus-accent); background: #ffffff; box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1); }
.auth-input:focus + .icon-left { color: var(--nexus-accent); }
.form-options { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; font-size: 13px; font-weight: 600; width: 100%; }
.remember-me { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.forgot-link { color: var(--nexus-accent); text-decoration: none; cursor: pointer; }
.btn-submit { width: 100%; height: 48px; background: var(--nexus-accent); color: white; border: none; border-radius: 8px; font-size: 14px; font-weight: 700; cursor: pointer; transition: all 0.3s; display: flex; align-items: center; justify-content: center; gap: 10px; box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3); }
.btn-back { width: 100%; height: 48px; background: white; color: var(--nexus-text); border: 1px solid #e2e8f0; border-radius: 8px; font-size: 14px; font-weight: 700; cursor: pointer; transition: all 0.3s; display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 15px;}
.footer-text { position: absolute; bottom: 20px; right: 60px; font-size: 11px; color: #94a3b8; font-weight: 500; }

/* MÜKEMMEL MOBİL UYUM EKLENTİSİ */
@media screen and (max-width: 1024px) {
    .auth-container { width: 90%; height: auto; min-height: 80vh; flex-direction: column; margin: 20px auto; overflow-y: auto; }
    .auth-left { flex: none; padding: 40px 30px; align-items: center; text-align: center; }
    .auth-left::before, .auth-left::after { display: none; }
    .hero-text h1 { font-size: 26px; margin-bottom: 10px; }
    .hero-text p { display: none; }
    .auth-right { flex: none; padding: 40px 30px; height: auto; min-height: 450px; }
    .footer-text { position: static; text-align: center; width: 100%; margin-top: 20px; }
}
@media screen and (max-width: 600px) {
    body { padding: 15px; align-items: flex-start; }
    .auth-container { width: 100%; margin: 0; border-radius: 12px; }
    .auth-left { padding: 30px 20px; }
    .auth-right { padding: 30px 20px; }
    .form-wrapper { height: 380px; }
    .brand-logo { font-size: 22px; }
    .auth-title { font-size: 20px; }
    .auth-subtitle { font-size: 12px; }
}