:root{
  --bg:#060611;--bg2:#0c0c1d;--card:#11111e;--card-h:#181830;
  --border:#1c1c35;--border-h:#2a2a50;
  --fg:#e4e4f0;--fg2:#a0a0b8;--muted:#5e5e7e;
  --accent:#FF6347;--accent-l:#FF8A75;--accent-g:rgba(255,99,71,.22);
  --teal:#00D9A6;--teal-g:rgba(0,217,166,.18);
  --gold:#FFB347;--gold-g:rgba(255,179,71,.18);
  --pink:#FF6B9D;--pink-g:rgba(255,107,157,.18);
  --blue:#7C8CFF;--blue-g:rgba(124,140,255,.18);
  --purple:#a855f7;--purple-g:rgba(168,85,247,.18);
  --r:12px;--rl:20px;--rxl:28px;
  --font:'Space Grotesk',sans-serif;--mono:'JetBrains Mono',monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--fg);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;outline:none}
input,select{font-family:inherit;outline:none}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg2)}
::-webkit-scrollbar-thumb{background:var(--border-h);border-radius:3px}

nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between;background:rgba(6,6,17,.8);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);transition:background .3s}
.nav-logo{font-size:1.3rem;font-weight:700;display:flex;align-items:center;gap:8px;cursor:pointer;letter-spacing:-.02em}
.nav-logo .brand-dot{color:var(--accent)}
.nav-logo .brand-in{color:var(--fg2);font-weight:400;font-size:.85rem;margin-left:2px}
.nav-links{display:flex;gap:8px;align-items:center}
.nav-link{padding:8px 16px;border-radius:8px;font-size:.9rem;font-weight:500;color:var(--fg2);transition:all .25s}
.nav-link:hover,.nav-link.active{color:var(--fg);background:rgba(255,255,255,.05)}

#app{min-height:100vh;padding-top:64px;transition:opacity .25s ease,transform .25s ease}
#app.fade{opacity:0;transform:translateY(8px)}

.hero{position:relative;min-height:520px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:80px 24px 60px;overflow:hidden}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.hero-bg::before{content:'';position:absolute;width:700px;height:700px;background:radial-gradient(circle,var(--accent-g),transparent 70%);top:-250px;right:-150px;animation:hFloat 22s ease-in-out infinite}
.hero-bg::after{content:'';position:absolute;width:550px;height:550px;background:radial-gradient(circle,var(--teal-g),transparent 70%);bottom:-200px;left:-100px;animation:hFloat 28s ease-in-out infinite reverse}
.hero-symbol{position:absolute;font-family:var(--mono);color:var(--muted);opacity:.12;animation:symbolFloat linear infinite;pointer-events:none}
@keyframes hFloat{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(40px,-30px) scale(1.1)}66%{transform:translate(-30px,20px) scale(.95)}}
@keyframes symbolFloat{0%{transform:translateY(100vh) rotate(0deg);opacity:0}10%{opacity:.12}90%{opacity:.12}100%{transform:translateY(-100vh) rotate(360deg);opacity:0}}

.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,99,71,.1);border:1px solid rgba(255,99,71,.2);color:var(--accent);padding:6px 16px;border-radius:100px;font-size:.82rem;font-weight:600;margin-bottom:24px;animation:fadeUp .7s ease both .05s}
.hero-title{font-size:clamp(2.6rem,6vw,4.5rem);font-weight:700;letter-spacing:-.03em;line-height:1.1;margin-bottom:16px;animation:fadeUp .7s ease both .15s}
.hero-title em{font-style:normal;background:linear-gradient(135deg,var(--accent),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:clamp(1rem,2vw,1.2rem);color:var(--fg2);max-width:520px;margin-bottom:36px;animation:fadeUp .7s ease both .25s}
.hero-search{position:relative;width:100%;max-width:460px;animation:fadeUp .7s ease both .35s}
.hero-search input{width:100%;padding:16px 20px 16px 48px;background:var(--card);border:1px solid var(--border);border-radius:var(--rl);color:var(--fg);font-size:1rem;transition:all .3s}
.hero-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-g)}
.hero-search input::placeholder{color:var(--muted)}
.hero-search i{position:absolute;left:18px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:1rem}
.hero-stats{display:flex;gap:40px;margin-top:40px;animation:fadeUp .7s ease both .45s}
.hero-stat{text-align:center}
.hero-stat b{display:block;font-size:1.6rem;font-weight:700;color:var(--fg)}
.hero-stat span{font-size:.82rem;color:var(--muted)}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

.section{padding:60px 24px;max-width:1200px;margin:0 auto}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px;flex-wrap:wrap;gap:12px}
.section-title{font-size:1.6rem;font-weight:700;display:flex;align-items:center;gap:10px}
.section-title i{color:var(--accent);font-size:1.2rem}
.section-link{color:var(--accent);font-size:.9rem;font-weight:500;display:flex;align-items:center;gap:4px;transition:gap .2s}
.section-link:hover{gap:8px}

.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:24px;cursor:pointer;transition:all .3s ease;overflow:hidden}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--card-accent,var(--accent));opacity:0;transition:opacity .3s}
.card:hover{transform:translateY(-4px);border-color:var(--border-h);background:var(--card-h);box-shadow:0 12px 40px rgba(0,0,0,.3)}
.card:hover::before{opacity:1}
.card-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;margin-bottom:16px;transition:transform .3s}
.card:hover .card-icon{transform:scale(1.1)}
.card-name{font-size:1.05rem;font-weight:600;margin-bottom:6px}
.card-desc{font-size:.85rem;color:var(--fg2);line-height:1.5}
.card-cat{display:inline-block;margin-top:12px;font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;padding:3px 10px;border-radius:100px}
.card.hidden{display:none}

.cat-math .card-icon{background:var(--accent-g);color:var(--accent)}
.cat-math .card-cat{background:var(--accent-g);color:var(--accent)}
.cat-math{--card-accent:var(--accent)}
.cat-health .card-icon{background:var(--teal-g);color:var(--teal)}
.cat-health .card-cat{background:var(--teal-g);color:var(--teal)}
.cat-health{--card-accent:var(--teal)}
.cat-finance .card-icon{background:var(--gold-g);color:var(--gold)}
.cat-finance .card-cat{background:var(--gold-g);color:var(--gold)}
.cat-finance{--card-accent:var(--gold)}
.cat-conversion .card-icon{background:var(--blue-g);color:var(--blue)}
.cat-conversion .card-cat{background:var(--blue-g);color:var(--blue)}
.cat-conversion{--card-accent:var(--blue)}
.cat-education .card-icon{background:var(--pink-g);color:var(--pink)}
.cat-education .card-cat{background:var(--pink-g);color:var(--pink)}
.cat-education{--card-accent:var(--pink)}
.cat-developer .card-icon{background:var(--purple-g);color:var(--purple)}
.cat-developer .card-cat{background:var(--purple-g);color:var(--purple)}
.cat-developer{--card-accent:var(--purple)}


.filter-row{display:flex;gap:8px;margin-bottom:28px;flex-wrap:wrap}
.pill{padding:8px 18px;border-radius:100px;font-size:.85rem;font-weight:500;background:var(--card);border:1px solid var(--border);color:var(--fg2);transition:all .25s}
.pill:hover{border-color:var(--border-h);color:var(--fg)}
.pill.active{background:var(--accent);border-color:var(--accent);color:#fff}

.reveal{opacity:1;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

footer{background:var(--bg2);border-top:1px solid var(--border);padding:48px 24px 24px;margin-top:40px}
.footer-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:2fr 1.2fr 1.2fr 1.2fr 1.1fr;gap:24px}
.footer-brand .nav-logo{margin-bottom:12px}
.footer-brand p{color:var(--muted);font-size:.88rem;max-width:280px}
.footer-col h4{font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--fg2);margin-bottom:16px}
.footer-col a{display:block;font-size:.88rem;color:var(--muted);padding:4px 0;transition:color .2s}
.footer-col a:hover{color:var(--fg)}
.footer-bottom{max-width:1200px;margin:32px auto 0;padding-top:24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;font-size:.82rem;color:var(--muted);flex-wrap:wrap;gap:12px}
.footer-bottom a{color:var(--fg2);transition:color .2s}
.footer-bottom a:hover{color:var(--accent)}

/* ===== CALCULATOR PAGES ===== */
.calc-page{max-width:680px;margin:0 auto;padding:32px 20px 80px}
.calc-back{display:inline-flex;align-items:center;gap:8px;color:var(--fg2);font-size:.9rem;font-weight:500;padding:8px 0;margin-bottom:24px;transition:color .2s;cursor:pointer;background:none}
.calc-back:hover{color:var(--accent)}
.calc-header{margin-bottom:28px}
.calc-header h1{font-size:1.8rem;font-weight:700;margin-bottom:4px}
.calc-header p{color:var(--fg2);font-size:.92rem}
.calc-box{background:var(--card);border:1px solid var(--border);border-radius:var(--rl);padding:28px;margin-bottom:20px}
.calc-box h3{font-size:1rem;font-weight:600;margin-bottom:16px;color:var(--fg2)}
.calc-row{display:flex;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.calc-field{flex:1;min-width:120px}
.calc-field label{display:block;font-size:.8rem;font-weight:500;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.04em}
.calc-field input,.calc-field select{width:100%;padding:12px 14px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);color:var(--fg);font-size:.95rem;transition:border-color .2s}
.calc-field input:focus,.calc-field select:focus{border-color:var(--accent)}
.calc-field select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%235e5e7e'%3E%3Cpath d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}
.calc-field select option{background:var(--bg2);color:var(--fg)}
.calc-btn{width:100%;padding:14px;background:var(--accent);color:#fff;font-size:1rem;font-weight:600;border-radius:var(--r);transition:all .25s;margin-top:4px}
.calc-btn:hover{background:var(--accent-l);box-shadow:0 4px 20px var(--accent-g)}
.calc-btn-secondary{background:var(--card);border:1px solid var(--border);color:var(--fg2)}
.calc-btn-secondary:hover{background:var(--card-h);color:var(--fg);box-shadow:none}
.calc-result{margin-top:20px;padding:20px;background:var(--bg2);border-radius:var(--r);border:1px solid var(--border)}
.calc-result .label{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px}
.calc-result .value{font-size:1.5rem;font-weight:700;font-family:var(--mono)}
.calc-result .sub{font-size:.88rem;color:var(--fg2);margin-top:4px}
.calc-result-row{display:flex;gap:16px;flex-wrap:wrap}
.calc-result-item{flex:1;min-width:100px}
.calc-error{color:var(--accent);font-size:.88rem;margin-top:12px}
.calc-tabs{display:flex;gap:4px;margin-bottom:20px;background:var(--bg2);border-radius:var(--r);padding:4px}
.calc-tab{flex:1;padding:10px 12px;text-align:center;font-size:.85rem;font-weight:500;border-radius:8px;color:var(--muted);transition:all .25s;background:none}
.calc-tab.active{background:var(--card);color:var(--fg);box-shadow:0 2px 8px rgba(0,0,0,.2)}
.calc-tab:hover:not(.active){color:var(--fg2)}

.calc-display{background:var(--bg);border-radius:var(--r);padding:20px;margin-bottom:16px;text-align:right;min-height:90px;display:flex;flex-direction:column;justify-content:flex-end;border:1px solid var(--border)}
.calc-display .expr{font-size:.9rem;color:var(--muted);font-family:var(--mono);min-height:24px;word-break:break-all}
.calc-display .result{font-size:2.2rem;font-weight:600;font-family:var(--mono);word-break:break-all}
.keypad{display:grid;gap:8px}
.keypad.basic{grid-template-columns:repeat(4,1fr)}
.keypad.scientific{grid-template-columns:repeat(5,1fr)}
.key{padding:16px;text-align:center;font-size:1.05rem;font-weight:500;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);color:var(--fg);transition:all .15s;user-select:none}
.key:hover{background:var(--card-h);border-color:var(--border-h)}
.key:active{transform:scale(.95)}
.key.op{color:var(--accent);font-weight:600}
.key.fn{color:var(--teal);font-size:.85rem}
.key.eq{background:var(--accent);color:#fff;border-color:var(--accent)}
.key.eq:hover{background:var(--accent-l)}
.key.danger{color:var(--accent)}
.key.wide{grid-column:span 2}

.gpa-table{width:100%;border-collapse:collapse}
.gpa-table th,.gpa-table td{padding:10px 12px;text-align:left;font-size:.88rem;border-bottom:1px solid var(--border)}
.gpa-table th{color:var(--muted);font-weight:500;font-size:.78rem;text-transform:uppercase;letter-spacing:.04em}
.gpa-table input,.gpa-table select{width:100%;padding:8px 10px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;color:var(--fg);font-size:.88rem}
.gpa-table input:focus,.gpa-table select:focus{border-color:var(--accent)}
.gpa-table .del-btn{background:none;color:var(--muted);font-size:1rem;padding:4px 8px;transition:color .2s}
.gpa-table .del-btn:hover{color:var(--accent)}

.vis-bar{height:28px;border-radius:8px;overflow:hidden;display:flex;margin:16px 0 8px;background:var(--bg)}
.vis-bar div{height:100%;transition:width .6s ease;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;color:#fff}
.vis-bar .principal{background:var(--teal)}
.vis-bar .interest{background:var(--accent)}
.vis-legend{display:flex;gap:20px;font-size:.82rem;color:var(--fg2)}
.vis-legend span::before{content:'';display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:middle}
.vis-legend .l-p::before{background:var(--teal)}
.vis-legend .l-i::before{background:var(--accent)}

.temp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.temp-cell{text-align:center}
.temp-cell label{display:block;font-size:.78rem;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.04em}
.temp-cell input{width:100%;padding:14px;text-align:center;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);color:var(--fg);font-size:1.1rem;font-family:var(--mono)}

.tip-presets{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.tip-preset{padding:8px 16px;border-radius:100px;background:var(--bg2);border:1px solid var(--border);color:var(--fg2);font-size:.88rem;font-weight:500;transition:all .2s}
.tip-preset.active,.tip-preset:hover{background:var(--accent);border-color:var(--accent);color:#fff}

.shape-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px}
.shape-btn{padding:10px;text-align:center;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);color:var(--fg2);font-size:.85rem;font-weight:500;transition:all .2s}
.shape-btn.active,.shape-btn:hover{background:var(--card-h);border-color:var(--accent);color:var(--fg)}

@media(max-width:768px){
  .footer-inner{grid-template-columns:1fr 1fr;gap:24px}
  .hero-stats{gap:24px}
  .hero-stat b{font-size:1.3rem}
  .temp-grid{grid-template-columns:1fr}
  .keypad.scientific{grid-template-columns:repeat(4,1fr)}
  .calc-result-row{flex-direction:column;gap:12px}
  .nav-links .nav-link span{display:none}
  .shape-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:480px){
  .cards-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .hero{min-height:440px;padding:60px 16px 40px}
  .section{padding:40px 16px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important}
}