/* ============================================================
   Alpha Library Management Software — Single-Page Premium CSS
   Theme: Teal gradient (Alpha Softwares brand)
   ============================================================ */

/* ---------- Custom Properties ---------- */
:root {
  --teal-50:  #f0fdfa;
  --teal-100: #ccfbf1;
  --teal-200: #99f6e4;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  --teal-800: #115e59;
  --teal-900: #134e4a;

  --amber-400: #fbbf24;
  --amber-500: #f59e0b;

  --slate-50:  #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;

  --gradient-teal: linear-gradient(135deg, var(--teal-500) 0%, var(--teal-700) 100%);
  --gradient-teal-light: linear-gradient(135deg, var(--teal-400) 0%, var(--teal-600) 100%);

  --shadow-xs:  0 1px 2px rgba(0,0,0,.05);
  --shadow-sm:  0 4px 6px -1px rgba(13,148,136,.08), 0 2px 4px -2px rgba(13,148,136,.06);
  --shadow-md:  0 10px 25px -5px rgba(13,148,136,.12), 0 6px 10px -6px rgba(13,148,136,.08);
  --shadow-lg:  0 20px 40px -10px rgba(13,148,136,.18);
  --shadow-xl:  0 30px 60px -15px rgba(13,148,136,.25);
  --shadow-glow: 0 0 30px rgba(13,148,136,.35);

  --ease-out-expo: cubic-bezier(.16,1,.3,1);
  --transition: .35s var(--ease-out-expo);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Inter',system-ui,sans-serif;color:var(--slate-800);background:#fff;line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,h5,h6{font-family:'Outfit',system-ui,sans-serif;font-weight:700;letter-spacing:-.02em;line-height:1.2}
a{text-decoration:none;color:inherit;transition:color var(--transition)}
ul{list-style:none}
img{max-width:100%;display:block}

/* ---------- Layout ---------- */
.container{max-width:1200px;margin:0 auto;padding:0 2rem}
.text-center{text-align:center}

/* ---------- Section Utilities ---------- */
.section-header{margin-bottom:4rem;text-align:center}
.section-label{display:inline-block;font-size:.8125rem;font-weight:700;text-transform:uppercase;letter-spacing:2px;color:var(--teal-600);background:var(--teal-50);padding:.5rem 1.25rem;border-radius:50px;margin-bottom:1rem;border:1px solid var(--teal-100)}
.section-title{font-size:2.75rem;color:var(--slate-900);margin-bottom:1rem}
.section-title span{color:var(--teal-600)}
.section-subtitle{font-size:1.125rem;color:var(--slate-500);max-width:660px;margin:0 auto}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.7rem 1.6rem;border-radius:50px;font-weight:600;font-family:'Outfit',sans-serif;font-size:.95rem;transition:all var(--transition);cursor:pointer;border:none}
.btn-teal{background:var(--gradient-teal);color:#fff !important;box-shadow:var(--shadow-md)}
.btn-teal:hover{transform:translateY(-3px);box-shadow:var(--shadow-glow);background:var(--gradient-teal-light)}
.btn-teal-outline{background:transparent;border:2px solid var(--teal-500);color:var(--teal-600) !important}
.btn-teal-outline:hover{background:var(--teal-50);transform:translateY(-3px)}
.btn-white{background:#fff;color:var(--teal-700) !important;box-shadow:var(--shadow-sm)}
.btn-white:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.btn-sm{padding:.65rem 1.5rem;font-size:.875rem}

/* ---------- Navbar ---------- */
.navbar{position:fixed;top:0;width:100%;z-index:1000;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(13,148,136,.08);transition:box-shadow var(--transition)}
.navbar.scrolled{box-shadow:0 4px 30px rgba(13,148,136,.06)}
.navbar .container{display:flex;justify-content:space-between;align-items:center;height:76px}
.logo{font-family:'Outfit',sans-serif;font-size:1.6rem;font-weight:800;display:flex;align-items:center;gap:.5rem;color:var(--teal-700)}
.nav-links{display:flex;gap:2.5rem}
.nav-links a{font-weight:600;font-size:.9375rem;color:var(--slate-600);position:relative;padding:.35rem 0}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2.5px;background:var(--gradient-teal);border-radius:2px;transition:width var(--transition)}
.nav-links a:hover,.nav-links a.active{color:var(--teal-600)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{font-size:.875rem;padding:.7rem 1.5rem}
.mobile-toggle{display:none;background:none;border:none;font-size:1.5rem;color:var(--slate-700);cursor:pointer}

/* ---------- Hero ---------- */
.hero{
  padding:120px 0 80px;
  background-image: url('hero-bg.webp');
  background-position: center 40%;
  background-size: 110% auto;
  background-repeat: no-repeat;
  position:relative;overflow:hidden;min-height:720px;display:flex;align-items:center;
  background-color: #fff;
}
/* Left-side white fade overlay so text stays readable */
.hero::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(
    to right,
    rgba(255,255,255,1) 0%,
    rgba(255,255,255,0.95) 30%,
    rgba(255,255,255,0.85) 50%,
    rgba(255,255,255,0.4) 75%,
    rgba(255,255,255,0.2) 100%
  );
  z-index:1;
}
.hero::after{content:'';display:none}
.hero .container{position:relative;z-index:2}
.hero-grid{display:grid;grid-template-columns:1.1fr 0.9fr;gap:3rem;align-items:center}
.hero-image-spacer{height:360px}

.hero-content{max-width:620px;text-align:left}
.hero-badge{display:inline-flex;align-items:center;gap:.5rem;font-size:.8125rem;font-weight:700;color:var(--teal-700);background:#fff;border:1px solid var(--teal-100);padding:.5rem 1.25rem;border-radius:50px;margin-bottom:1.5rem;box-shadow:0 2px 12px rgba(13,148,136,.12)}
.hero h1{font-size:3.75rem;line-height:1.08;color:var(--slate-900);margin-bottom:1.5rem}
.hero h1 span{background:var(--gradient-teal);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:1.15rem;color:var(--slate-500);margin-bottom:2rem;max-width:560px;line-height:1.8}
.hero-btns{display:flex;gap:1rem;flex-wrap:wrap}
.hero-tags{display:flex;gap:.75rem;margin-top:2.5rem;flex-wrap:nowrap}
.hero-tags span{display:flex;align-items:center;gap:.5rem;font-size:.8125rem;font-weight:600;color:var(--slate-600);background:rgba(255,255,255,.9);border:1px solid var(--slate-200);padding:.5rem 1rem;border-radius:50px;box-shadow:var(--shadow-xs);transition:all var(--transition);white-space:nowrap}
.hero-tags span:hover{border-color:var(--teal-300);color:var(--teal-700);transform:translateY(-2px)}
.hero-tags span i{color:var(--teal-500)}

/* ---------- Trust Bar ---------- */
.trust{padding:3.5rem 0;background:#fff;border-bottom:1px solid var(--slate-200)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem}
.trust-item{display:flex;align-items:center;gap:1rem}
.trust-icon{width:56px;height:56px;background:var(--teal-50);color:var(--teal-600);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0;transition:all var(--transition)}
.trust-item:hover .trust-icon{background:var(--gradient-teal);color:#fff;transform:scale(1.08)}
.trust-item h4{font-size:1.05rem;margin-bottom:.15rem;color:var(--slate-800)}
.trust-item p{font-size:.8125rem;color:var(--slate-500);font-weight:500}

/* ---------- Overview ---------- */
.overview{padding:6rem 0;background:#fff}
.overview-box{text-align:center;}
.overview-box p{font-size:1.15rem;color:var(--slate-600);max-width:900px;margin:0 auto;line-height:1.9}
.overview-box strong{color:var(--teal-700)}

/* ---------- Features ---------- */
.features{padding:8rem 0;background:var(--slate-50)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}
.feature-card{background:#fff;padding:2rem 1.75rem;border-radius:16px;border:1px solid var(--slate-100);transition:all var(--transition);position:relative;overflow:hidden;box-shadow:var(--shadow-xs)}
.feature-card::after{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient-teal);transform:scaleX(0);transform-origin:left;transition:transform .4s var(--ease-out-expo)}
.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:var(--teal-200)}
.feature-card:hover::after{transform:scaleX(1)}
.f-icon{width:44px;height:44px;background:var(--gradient-teal);color:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;margin-bottom:1.25rem;box-shadow:var(--shadow-sm)}
.feature-card h3{font-size:1.2rem;color:var(--slate-800);margin-bottom:1rem}
.f-list li{padding:.55rem 0;display:flex;align-items:flex-start;gap:.75rem;color:var(--slate-600);font-weight:500;font-size:.95rem;border-bottom:1px solid var(--slate-50)}
.f-list li:last-child{border:none}
.f-list li i{color:var(--teal-500);margin-top:.28rem;font-size:.875rem;flex-shrink:0}

/* ---------- Pricing ---------- */
.pricing{padding:8rem 0;background:#fff;position:relative;overflow:hidden}
.pricing::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at top left,rgba(20,184,166,.08) 0%,transparent 50%)}

.pricing-plans{display:grid;grid-template-columns:1.1fr 1fr;gap:2.5rem;position:relative;z-index:2;align-items:start}

/* Main plan card */
.plan-card{background:#fff;border:1px solid var(--slate-200);border-radius:24px;padding:2.5rem;box-shadow:var(--shadow-sm);position:relative;transition:all var(--transition)}
.plan-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-xl);border-color:var(--teal-400)}
.plan-badge{display:inline-block;font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;padding:.4rem 1.1rem;border-radius:50px;background:var(--gradient-teal);color:#fff;margin-bottom:1.5rem}
.plan-icon{font-size:2.2rem;color:var(--teal-500);margin-bottom:1rem}
.plan-card h3{font-size:1.6rem;color:var(--slate-800);margin-bottom:.75rem}
.plan-price{font-family:'Outfit',sans-serif;font-size:2.5rem;font-weight:800;color:var(--teal-700);margin-bottom:.35rem;display:flex;align-items:baseline;gap:.5rem}
.plan-price span{font-size:1rem;font-weight:600;color:var(--slate-500)}
.plan-note{font-size:.9rem;color:var(--slate-500);margin-bottom:1.75rem}
.plan-features{display:grid;grid-template-columns:1fr 1fr;gap:.2rem}
.plan-features li{padding:.5rem 0;display:flex;align-items:center;gap:.65rem;color:var(--slate-600);font-weight:500;font-size:.9rem;border-bottom:1px solid var(--slate-50)}
.plan-features li:last-child,.plan-features li:nth-last-child(2){border:none}
.plan-features li i{color:var(--teal-500);font-size:.8rem;flex-shrink:0}
.plan-features li strong{color:var(--teal-700)}

/* Add-ons panel */
.addons-panel{background:#fff;border:1px solid var(--slate-200);border-radius:24px;padding:2.25rem;box-shadow:var(--shadow-sm)}
.addons-title{font-size:1.25rem;color:var(--slate-800);margin-bottom:.4rem;display:flex;align-items:center;gap:.65rem}
.addons-title i{color:var(--teal-500)}
.addons-sub{font-size:.875rem;color:var(--slate-500);margin-bottom:1.75rem}
.addon-item{display:flex;align-items:center;gap:1rem;padding:1rem;border-radius:14px;border:1px solid var(--slate-100);margin-bottom:1rem;transition:all var(--transition)}
.addon-item:hover{border-color:var(--teal-200);background:var(--teal-50);transform:translateX(4px)}
.addon-icon{width:44px;height:44px;background:var(--teal-50);color:var(--teal-600);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0;transition:all var(--transition)}
.addon-item:hover .addon-icon{background:var(--gradient-teal);color:#fff}
.addon-info{flex:1}
.addon-info h5{font-size:.95rem;color:var(--slate-800);margin-bottom:.15rem}
.addon-info p{font-size:.8rem;color:var(--slate-500)}
.addon-price{font-family:'Outfit',sans-serif;font-size:.9rem;font-weight:700;color:var(--teal-600);white-space:nowrap}
.addon-note{background:var(--teal-50);border:1px solid var(--teal-100);border-radius:12px;padding:1rem 1.25rem;font-size:.85rem;color:var(--teal-700);display:flex;align-items:center;gap:.75rem;margin-top:1.25rem}
.addon-note i{font-size:1rem;flex-shrink:0}

/* ---------- Tech Specs ---------- */
.specs{padding:5rem 0;background:var(--slate-50);border-top:1px solid var(--slate-200)}
.specs-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem}
.spec-item{text-align:center;padding:2rem 1.5rem;background:var(--slate-50);border-radius:16px;border:1px solid var(--slate-200);transition:all var(--transition)}
.spec-item:hover{border-color:var(--teal-300);box-shadow:var(--shadow-sm);background:var(--teal-50)}
.spec-item i{font-size:2rem;color:var(--teal-500);margin-bottom:1rem;transition:transform var(--transition)}
.spec-item:hover i{transform:scale(1.15)}
.spec-item h4{font-size:1.05rem;color:var(--slate-800);margin-bottom:.35rem}
.spec-item p{font-size:.875rem;color:var(--slate-500)}

/* ---------- Contact ---------- */
.contact{padding:8rem 0;background:#fff}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:5rem}
.contact-card{display:flex;align-items:flex-start;gap:1.25rem;padding:1.5rem 2rem;background:#fff;border-radius:16px;margin-bottom:1.25rem;border:1px solid var(--slate-200);transition:all var(--transition);box-shadow:var(--shadow-xs)}
.contact-card:hover{transform:translateX(8px);border-color:var(--teal-300);box-shadow:var(--shadow-sm)}
.c-icon{width:54px;height:54px;background:var(--teal-50);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.35rem;color:var(--teal-600);flex-shrink:0;transition:all var(--transition)}
.contact-card:hover .c-icon{background:var(--gradient-teal);color:#fff}
.c-text h4{font-size:1.05rem;color:var(--slate-800);margin-bottom:.35rem}
.c-text p,.c-text a{color:var(--slate-500);font-size:.95rem;font-weight:500}
.c-text a:hover{color:var(--teal-600)}
.contact-form{padding:2.5rem;background:#fff;border-radius:24px;box-shadow:var(--shadow-lg);border:1px solid var(--slate-100)}
.contact-form h3{font-size:1.6rem;color:var(--slate-800);margin-bottom:1.5rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.form-group{margin-bottom:.85rem}
.form-group label{display:block;margin-bottom:.35rem;font-weight:600;font-size:.875rem;color:var(--slate-700)}
.form-control{width:100%;padding:.75rem 1rem;border:2px solid var(--slate-200);border-radius:12px;font-family:inherit;font-size:.95rem;background:var(--slate-50);transition:all var(--transition);color:var(--slate-800)}
.form-control:focus{outline:none;border-color:var(--teal-500);background:#fff;box-shadow:0 0 0 4px rgba(20,184,166,.1)}

/* ---------- Footer ---------- */
footer{background:var(--slate-50);color:var(--slate-800);padding:4rem 0 1.5rem;border-top:1px solid var(--slate-200)}
.footer-grid{display:grid;grid-template-columns:2.5fr 1fr 1fr;gap:4rem;margin-bottom:2.5rem}
.footer-about h2{color:var(--slate-900);font-size:1.75rem;margin-bottom:1rem}
.footer-about p{color:var(--slate-600);font-size:.9375rem;max-width:380px;line-height:1.8}
.footer-links h4{font-size:1rem;margin-bottom:1.25rem;color:var(--slate-900);text-transform:uppercase;letter-spacing:1px;font-size:.8125rem}
.footer-links ul li{margin-bottom:.75rem}
.footer-links ul li a{color:var(--slate-600);font-weight:500;font-size:.9rem;transition:all var(--transition)}
.footer-links ul li a:hover{color:var(--teal-600);padding-left:6px}
.footer-bottom{border-top:1px solid var(--slate-200);padding-top:1.5rem;color:var(--slate-500);font-size:.8125rem;text-align:center;font-weight:500}

/* ---------- Back to Top ---------- */
.back-top{position:fixed;bottom:2rem;right:2rem;width:48px;height:48px;border-radius:14px;background:var(--gradient-teal);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.25rem;box-shadow:var(--shadow-md);opacity:0;pointer-events:none;transition:all var(--transition);z-index:999;border:none;cursor:pointer}
.back-top.visible{opacity:1;pointer-events:all}
.back-top:hover{transform:translateY(-4px);box-shadow:var(--shadow-glow)}

/* ---------- Animations ---------- */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.animate-in{opacity:0;transform:translateY(30px);transition:opacity .6s var(--ease-out-expo),transform .6s var(--ease-out-expo)}
.animate-in.visible{opacity:1;transform:translateY(0)}

/* ---------- Mobile Nav Open ---------- */
@media(max-width:768px){
  .nav-links.open{
    display:flex;flex-direction:column;position:absolute;top:76px;left:0;right:0;
    background:#fff;padding:1.5rem 2rem;gap:1.25rem;border-bottom:1px solid var(--slate-200);
    box-shadow:var(--shadow-md);z-index:999
  }
}

/* ---------- Responsive ---------- */
@media(max-width:1024px){
  .trust-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .pricing-plans{grid-template-columns:1fr}
  .plan-features{grid-template-columns:1fr}
  .specs-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2.5rem}
  .footer-about{grid-column:1/-1}
  .hero{padding:140px 0 80px}
  .hero h1{font-size:3rem}
  .hero-grid{grid-template-columns:1fr}
  .hero-image-spacer{display:none}
}

@media(max-width:768px){
  .nav-links,.nav-cta-desktop{display:none}
  .mobile-toggle{display:block}
  .hero{padding:120px 0 70px}
  .hero-content{text-align:center}
  .hero h1{font-size:2.4rem}
  .hero-desc{margin:0 auto 2rem}
  .hero-btns{justify-content:center}
  .hero-tags{flex-wrap:wrap;justify-content:center}
  .section-title{font-size:2.1rem}
  .features-grid,.trust-grid,.specs-grid,.form-row{grid-template-columns:1fr}
  .contact-form{padding:1.75rem}
  .footer-grid{grid-template-columns:1fr;gap:2rem}
  .overview-box p{font-size:1rem}
  .plan-features{grid-template-columns:1fr}
}