/* ── ICASSLab – Academic Clarity Theme ── */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800;900&family=Nunito:wght@400;500;600;700;800&display=swap');

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}

:root{
  --indigo:      #4338ca;
  --indigo-lt:   #6366f1;
  --indigo-pale: #eef2ff;
  --emerald:     #059669;
  --emerald-lt:  #d1fae5;
  --rose:        #e11d48;
  --rose-lt:     #ffe4e6;
  --amber:       #d97706;
  --amber-lt:    #fef3c7;
  --bg:          #f8f9fc;
  --card:        #ffffff;
  --text:        #0f172a;
  --muted:       #64748b;
  --border:      #e2e8f0;
  --radius:      16px;
  --shadow:      0 4px 24px rgba(15,23,42,.07);
  --shadow-lg:   0 12px 40px rgba(15,23,42,.11);
}

body{
  font-family:'Nunito',sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:15px;
  line-height:1.65;

  /* subtle dot grid */
  background-image: radial-gradient(circle, #c7d2fe 1px, transparent 1px);
  background-size: 28px 28px;
  background-attachment: fixed;
}

a{color:var(--indigo-lt);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;display:block;}

/* ── CONTAINER ── */
.container{max-width:1080px;margin:0 auto;padding:0 18px;}

/* ── HEADER ── */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.9);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
  box-shadow:0 2px 12px rgba(15,23,42,.06);
}
.navbar{
  display:flex;align-items:center;justify-content:space-between;
  height:62px;gap:12px;
}
.brand{
  display:flex;align-items:center;gap:9px;
  font-family:'Outfit',sans-serif;font-size:19px;font-weight:800;
  color:var(--text);text-decoration:none;
}
.dot{
  width:10px;height:10px;border-radius:50%;
  background:linear-gradient(135deg,var(--indigo),var(--indigo-lt));
  box-shadow:0 0 0 3px rgba(99,102,241,.22);
  flex-shrink:0;
}
.nav-links{display:flex;align-items:center;gap:4px;}
.nav-links a{
  padding:8px 13px;border-radius:10px;
  font-family:'Outfit',sans-serif;font-size:14px;font-weight:600;
  color:var(--muted);transition:background .15s,color .15s;
  text-decoration:none;white-space:nowrap;
}
.nav-links a:hover,.nav-links a.active{background:#f1f5f9;color:var(--text);}
.btn-primary{
  background:linear-gradient(135deg,var(--indigo),var(--indigo-lt))!important;
  color:#fff!important;
  box-shadow:0 4px 14px rgba(67,56,202,.28)!important;
}
.btn-primary:hover{box-shadow:0 6px 20px rgba(67,56,202,.38)!important;transform:translateY(-1px);}

/* Mobile menu button */
.menu-btn{
  display:none;
  background:none;border:1px solid var(--border);border-radius:10px;
  padding:8px 13px;font-family:'Outfit',sans-serif;font-size:13px;font-weight:700;
  color:var(--muted);cursor:pointer;transition:all .15s;
}
.menu-btn:hover{background:#f1f5f9;color:var(--text);}

/* Mobile panel */
.mobile-panel{
  display:none;
  flex-direction:column;gap:4px;
  padding:10px 0 16px;
  border-top:1px solid var(--border);
  background:rgba(255,255,255,.98);
}
.mobile-panel.open{display:flex;}
.mobile-panel a{
  padding:12px 14px;border-radius:12px;
  font-family:'Outfit',sans-serif;font-size:15px;font-weight:700;
  color:var(--muted);text-decoration:none;transition:background .15s,color .15s;
}
.mobile-panel a:hover{background:#f1f5f9;color:var(--text);}
.mobile-panel .btn-primary{
  background:linear-gradient(135deg,var(--indigo),var(--indigo-lt))!important;
  color:#fff!important;text-align:center;
}

/* ── HERO ── */
.hero{
  padding:56px 0 48px;
  background:
    radial-gradient(ellipse 700px 400px at 0% 50%,rgba(99,102,241,.12),transparent 65%),
    radial-gradient(ellipse 500px 300px at 100% 20%,rgba(16,185,129,.10),transparent 60%),
    linear-gradient(160deg,#ffffff 0%,#f0f4ff 50%,#ecfdf5 100%);
  position:relative;overflow:hidden;
}
.hero::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--indigo-lt),var(--emerald),transparent);
}
.hero-card{
  max-width:700px;
  animation:heroIn .6s cubic-bezier(.4,0,.2,1) both;
}
@keyframes heroIn{from{opacity:0;transform:translateY(20px);}to{opacity:1;transform:translateY(0);}}

.hero-card h1{
  font-family:'Outfit',sans-serif;font-size:2.5rem;font-weight:900;
  color:var(--text);line-height:1.15;margin-bottom:14px;
}
.hero-card h1 em{
  font-style:normal;
  background:linear-gradient(135deg,var(--indigo),var(--indigo-lt));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero-card p{
  font-size:16px;color:var(--muted);line-height:1.7;margin-bottom:22px;max-width:560px;
}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;}

/* ── BUTTONS ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:12px 22px;border-radius:12px;border:none;cursor:pointer;
  font-family:'Outfit',sans-serif;font-size:14px;font-weight:800;
  background:linear-gradient(135deg,var(--indigo),var(--indigo-lt));
  color:#fff;box-shadow:0 4px 16px rgba(67,56,202,.28);
  text-decoration:none;transition:transform .15s,box-shadow .15s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(67,56,202,.38);text-decoration:none;color:#fff;}
.btn:active{transform:translateY(0);}
.btn.secondary{
  background:#fff;color:var(--indigo);
  border:1.5px solid #c7d2fe;
  box-shadow:0 2px 10px rgba(67,56,202,.10);
}
.btn.secondary:hover{background:var(--indigo-pale);box-shadow:0 4px 16px rgba(67,56,202,.15);}

/* ── SECTION ── */
.section{padding:32px 0;}
.section-title{
  font-family:'Outfit',sans-serif;font-size:1.5rem;font-weight:800;
  color:var(--text);margin-bottom:6px;
}
.section-sub{color:var(--muted);font-size:14.5px;margin-bottom:20px;max-width:640px;}

/* ── GRID ── */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;}

/* ── CARDS ── */
.card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow);
  transition:transform .15s,box-shadow .15s;
  position:relative;overflow:hidden;
}
.card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--indigo),var(--indigo-lt),var(--emerald));
  opacity:0;transition:opacity .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.card:hover::before{opacity:1;}
.card h2{font-family:'Outfit',sans-serif;font-size:17px;font-weight:800;color:var(--text);margin-bottom:9px;}
.card p{color:var(--muted);font-size:14px;line-height:1.6;margin-bottom:12px;}
.card p:last-child{margin-bottom:0;}

/* Hint */
.hint{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--indigo-pale);color:var(--indigo);
  border:1px solid #c7d2fe;border-radius:8px;
  padding:7px 12px;font-size:12.5px;font-weight:700;margin-top:10px;
}

/* ── CALCULATOR FORM ── */
.label{
  display:block;font-family:'Outfit',sans-serif;font-size:12px;font-weight:800;
  color:var(--muted);letter-spacing:.5px;text-transform:uppercase;margin-bottom:6px;
}
.input{
  width:100%;padding:12px 14px;border-radius:12px;
  border:1.5px solid var(--border);background:#fff;
  font-family:'Nunito',sans-serif;font-size:15px;color:var(--text);outline:none;
  transition:border-color .2s,box-shadow .2s;
}
.input:focus{border-color:var(--indigo-lt);box-shadow:0 0 0 3px rgba(99,102,241,.14);}
.input::placeholder{color:#cbd5e1;}
textarea.input{resize:vertical;min-height:120px;}

/* ── RESULT NOTICE ── */
.notice{
  margin-top:18px;padding:18px 20px;border-radius:14px;
  font-family:'Outfit',sans-serif;font-size:15px;font-weight:700;
}
.notice.good{background:var(--emerald-lt);color:#065f46;border:1.5px solid #6ee7b7;}
.notice.bad{background:var(--rose-lt);color:#9f1239;border:1.5px solid #fda4af;}

/* Progress bar inside notice */
.progress{
  height:8px;border-radius:999px;background:rgba(0,0,0,.1);
  margin-top:12px;overflow:hidden;
}
.progress div{
  height:100%;border-radius:999px;
  background:linear-gradient(90deg,currentColor,rgba(0,0,0,.25));
  transition:width 800ms cubic-bezier(.4,0,.2,1);
}

/* ── AD SLOT ── */
.ad-slot{
  background:linear-gradient(135deg,#f8fafc,#eef2ff);
  border:1px dashed #c7d2fe;border-radius:var(--radius);
  padding:22px;text-align:center;color:#94a3b8;
  font-size:13px;font-weight:600;letter-spacing:.5px;
  margin:24px 0;text-transform:uppercase;
}

/* ── FADE IN ── */
.fade-in{
  opacity:0;transform:translateY(18px);
  animation:fadeUp .5s ease forwards;
}
.fade-in:nth-child(1){animation-delay:.05s;}
.fade-in:nth-child(2){animation-delay:.12s;}
.fade-in:nth-child(3){animation-delay:.19s;}
.fade-in:nth-child(4){animation-delay:.26s;}
@keyframes fadeUp{to{opacity:1;transform:translateY(0);}}

/* ── FOOTER ── */
.footer{
  background:#0f172a;color:rgba(255,255,255,.6);
  padding:28px 0;margin-top:40px;font-size:13.5px;
}
.footer a{color:rgba(255,255,255,.55);transition:color .15s;}
.footer a:hover{color:#fff;text-decoration:none;}
.links{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px;}

/* ── RESPONSIVE ── */
@media(max-width:768px){
  .menu-btn{display:block;}
  .nav-links{display:none;}
  .hero-card h1{font-size:1.9rem;}
  .hero-card p{font-size:15px;}
  .hero{padding:40px 0 36px;}
  .grid{grid-template-columns:1fr;}
  .btn-row{flex-direction:column;}
  .btn-row .btn{width:100%;justify-content:center;}
}
@media(max-width:420px){
  .hero-card h1{font-size:1.6rem;}
  .card{padding:16px;}
}