/* =========================================================
   Adhunik Computer Institute — Fundamentals of Accounts
   Design tokens: Ledger palette
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@500;600;700;800&family=Nunito:wght@400;600;700;800&family=Space+Mono:wght@400;700&display=swap');

:root{
  /* Core palette */
  --ink: #1B1035;            /* deep indigo-black for text */
  --paper: #FFFDF8;          /* warm off-white page bg */
  --paper-2: #FFF6E9;        /* warm card bg */

  --indigo: #3730A3;         /* primary — ledger cover */
  --indigo-deep: #241862;
  --gold: #F5A623;           /* highlight / balance */
  --gold-deep: #C9790A;
  --debit: #E0483E;          /* debit red */
  --debit-deep: #B22E26;
  --credit: #12876C;         /* credit green */
  --credit-deep: #0A6350;
  --sky: #2E9BD6;            /* accent blue */

  --line: rgba(27,16,53,0.12);
  --shadow: 0 10px 30px rgba(27,16,53,0.14);
  --shadow-lg: 0 20px 50px rgba(27,16,53,0.22);

  --radius: 22px;
  --radius-sm: 14px;

  --font-display: 'Baloo 2', sans-serif;
  --font-body: 'Nunito', sans-serif;
  --font-mono: 'Space Mono', monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  font-size: 19px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body::before{
  content:"";
  position: fixed;
  inset:0;
  z-index:-1;
  background-image:
    radial-gradient(circle at 6% 12%, rgba(55,48,163,0.06) 0, transparent 45%),
    radial-gradient(circle at 94% 88%, rgba(245,166,35,0.08) 0, transparent 45%);
}

h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--indigo-deep);
  line-height: 1.15;
  margin: 0 0 .5em;
}
h1{ font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 800; }
h2{ font-size: clamp(1.9rem, 3.4vw, 2.6rem); font-weight: 700; }
h3{ font-size: clamp(1.4rem, 2.4vw, 1.8rem); font-weight: 700; }
p{ margin: 0 0 1em; }
a{ color: var(--indigo); }

.container{ max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* ---------- Top Nav ---------- */
.topbar{
  position: sticky; top:0; z-index: 50;
  background: linear-gradient(90deg, var(--indigo-deep), var(--indigo));
  color:#fff;
  box-shadow: var(--shadow);
}
.topbar-inner{
  max-width:1120px; margin:0 auto; padding: 14px 28px;
  display:flex; align-items:center; justify-content:space-between; gap:18px;
}
.brand{ display:flex; align-items:center; gap:12px; text-decoration:none; color:#fff; }
.brand-badge{
  width:46px; height:46px; border-radius: 12px;
  background: var(--gold);
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:800; color:var(--indigo-deep);
  font-size:1.3rem; flex-shrink:0;
  box-shadow: 0 4px 0 var(--gold-deep);
}
.brand-text{ font-family: var(--font-display); font-weight:700; font-size:1.15rem; line-height:1.1;}
.brand-text span{ display:block; font-family: var(--font-body); font-weight:600; font-size:.72rem; opacity:.85; letter-spacing:.04em;}
.topbar nav{ display:flex; align-items:center; gap:6px; flex-wrap:wrap; }
.topbar nav a{
  color:#fff; text-decoration:none; font-weight:700; font-size:.92rem;
  padding:8px 12px; border-radius:10px; opacity:.88;
}
.topbar nav a:hover{ background: rgba(255,255,255,0.14); opacity:1; }
.topbar nav a.active{ background: var(--gold); color: var(--indigo-deep); opacity:1; }
.call-btn{
  background: var(--credit); color:#fff !important; display:flex; align-items:center; gap:8px;
  font-weight:800 !important;
  box-shadow: 0 4px 0 var(--credit-deep);
}
.call-btn:hover{ background: var(--credit) !important; }

.mobile-toggle{ display:none; background:none; border:none; color:#fff; font-size:1.6rem; cursor:pointer; }

@media (max-width: 900px){
  .topbar nav{
    display:none; position:absolute; top:100%; left:0; right:0;
    background: var(--indigo-deep); flex-direction:column; align-items:stretch;
    padding:10px 16px 18px; gap:4px; box-shadow: var(--shadow-lg);
  }
  .topbar nav.open{ display:flex; }
  .topbar nav a{ padding:12px 14px; }
  .mobile-toggle{ display:block; }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family: var(--font-body); font-weight:800; font-size:1rem;
  padding: 14px 26px; border-radius: 100px; text-decoration:none;
  border: none; cursor:pointer; transition: transform .15s ease;
}
.btn:hover{ transform: translateY(-2px); }
.btn-gold{ background: var(--gold); color: var(--indigo-deep); box-shadow: 0 5px 0 var(--gold-deep); }
.btn-outline{ background:#fff; color: var(--indigo); box-shadow: 0 5px 0 var(--line); border:2px solid var(--indigo); }
.btn-credit{ background: var(--credit); color:#fff; box-shadow: 0 5px 0 var(--credit-deep); }

/* ---------- Hero ---------- */
.hero{
  padding: 64px 0 56px;
  background:
    radial-gradient(circle at 85% 20%, rgba(245,166,35,0.18), transparent 55%),
    linear-gradient(160deg, var(--indigo-deep) 0%, var(--indigo) 60%, #4B3FC0 100%);
  color:#fff;
  position:relative; overflow:hidden;
}
.hero .container{ display:grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items:center; }
@media (max-width: 880px){ .hero .container{ grid-template-columns:1fr; } }
.hero-eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  background: rgba(255,255,255,0.14); border:1px solid rgba(255,255,255,0.3);
  padding:7px 16px; border-radius:100px; font-weight:800; font-size:.85rem;
  letter-spacing:.03em; margin-bottom:18px;
}
.hero h1{ color:#fff; }
.hero h1 em{ font-style:normal; color: var(--gold); }
.hero p.lead{ font-size:1.15rem; opacity:.92; max-width:52ch; }
.hero-cta{ display:flex; gap:14px; flex-wrap:wrap; margin-top: 26px; }

/* Ledger visual in hero */
.ledger-card{
  background:#fff; border-radius: var(--radius); padding:22px;
  box-shadow: var(--shadow-lg); color: var(--ink); transform: rotate(-2deg);
}
.ledger-card table{ width:100%; border-collapse:collapse; font-family: var(--font-mono); font-size:.88rem; }
.ledger-card caption{ font-family: var(--font-display); font-weight:700; text-align:left; margin-bottom:10px; color:var(--indigo-deep); font-size:1.1rem;}
.ledger-card th{ text-align:left; padding:8px 6px; border-bottom:2px solid var(--ink); font-family: var(--font-body); font-weight:800; font-size:.8rem; text-transform:uppercase; letter-spacing:.04em;}
.ledger-card td{ padding:9px 6px; border-bottom:1px dashed var(--line); }
.tag-dr{ color: var(--debit-deep); font-weight:800; }
.tag-cr{ color: var(--credit-deep); font-weight:800; }

/* ---------- Section blocks ---------- */
.section{ padding: 66px 0; }
.section-alt{ background: var(--paper-2); }
.eyebrow{
  display:inline-block; font-family: var(--font-display); font-weight:700;
  color: var(--gold-deep); background: rgba(245,166,35,0.16);
  padding:6px 16px; border-radius:100px; font-size:.85rem; margin-bottom:14px;
}

/* Topic grid (index page) */
.topic-grid{ display:grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 34px;}
@media (max-width: 720px){ .topic-grid{ grid-template-columns:1fr; } }
.topic-card{
  background:#fff; border-radius: var(--radius); padding: 26px 26px 24px;
  box-shadow: var(--shadow); text-decoration:none; color: var(--ink);
  border: 2px solid transparent; transition: transform .18s ease, border-color .18s ease;
  display:flex; gap:18px; align-items:flex-start;
}
.topic-card:hover{ transform: translateY(-4px); border-color: var(--gold); }
.topic-num{
  flex-shrink:0; width:52px; height:52px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:800; font-size:1.3rem; color:#fff;
}
.topic-card h3{ margin-bottom:6px; }
.topic-card p{ margin:0; font-size:.96rem; color: rgba(27,16,53,0.72); }
.topic-card .pill{
  display:inline-block; margin-top:10px; font-size:.78rem; font-weight:800;
  color: var(--indigo); background: rgba(55,48,163,0.08); padding:4px 10px; border-radius:100px;
}

/* Palette rotation for topic numbers */
.c1{ background: var(--indigo); } .c2{ background: var(--credit); }
.c3{ background: var(--debit); } .c4{ background: var(--gold-deep); }
.c5{ background: var(--sky); } .c6{ background: var(--indigo-deep); }
.c7{ background: #8B2FC9; }

/* ---------- Content page shell ---------- */
.page-hero{
  padding: 46px 0 40px;
  background: linear-gradient(135deg, var(--indigo-deep), var(--indigo));
  color:#fff;
}
.page-hero .container{ display:flex; align-items:center; gap:20px; flex-wrap:wrap; justify-content:space-between; }
.page-hero-num{
  font-family: var(--font-display); font-weight:800; font-size:3rem;
  background: rgba(255,255,255,.14); border-radius:18px; padding: 6px 22px;
  border: 2px solid rgba(255,255,255,0.35);
}
.page-hero h1{ color:#fff; margin-bottom:6px; }
.page-hero p{ opacity:.9; margin:0; max-width:60ch; }
.crumbs{ font-size:.85rem; opacity:.85; margin-bottom:10px; }
.crumbs a{ color:#fff; text-decoration:none; opacity:.85; }
.crumbs a:hover{ text-decoration:underline; }

.content-wrap{ padding: 50px 0 70px; }
.content-wrap .container{ display:grid; grid-template-columns: 240px 1fr; gap: 42px; align-items:start; }
@media (max-width: 900px){ .content-wrap .container{ grid-template-columns:1fr; } }

.side-toc{
  position: sticky; top: 96px; background:#fff; border-radius: var(--radius-sm);
  padding: 20px; box-shadow: var(--shadow); border:1px solid var(--line);
}
.side-toc h4{ font-size:1rem; margin-bottom:12px; color: var(--indigo);}
.side-toc a{
  display:block; text-decoration:none; color: var(--ink); font-weight:700;
  font-size:.92rem; padding:8px 10px; border-radius:8px; margin-bottom:2px;
}
.side-toc a:hover{ background: var(--paper-2); }

.card{
  background:#fff; border-radius: var(--radius); padding: 30px 32px;
  box-shadow: var(--shadow); border:1px solid var(--line); margin-bottom: 28px;
}
.card h2{ display:flex; align-items:center; gap:12px; }
.card h2 .dot{ width:12px; height:12px; border-radius:50%; background: var(--gold); flex-shrink:0; }

.term-box{
  background: var(--paper-2); border-left:5px solid var(--gold-deep);
  border-radius: 10px; padding: 16px 20px; margin: 14px 0;
}
.term-box b{ color: var(--indigo-deep); }

.example-box{
  background: linear-gradient(135deg, rgba(18,135,108,0.07), rgba(18,135,108,0.02));
  border: 2px dashed var(--credit); border-radius: var(--radius-sm);
  padding: 20px 24px; margin: 20px 0;
}
.example-box .ex-label{
  display:inline-flex; align-items:center; gap:8px; font-family: var(--font-display);
  font-weight:700; color: var(--credit-deep); background:#fff; padding:5px 14px;
  border-radius:100px; font-size:.85rem; margin-bottom:12px; box-shadow: var(--shadow);
}

.rule-card{
  border-radius: var(--radius); padding: 26px; color:#fff; margin-bottom:20px;
  box-shadow: var(--shadow);
}
.rule-personal{ background: linear-gradient(135deg, var(--indigo-deep), var(--indigo)); }
.rule-real{ background: linear-gradient(135deg, var(--credit-deep), var(--credit)); }
.rule-nominal{ background: linear-gradient(135deg, var(--debit-deep), var(--debit)); }
.rule-card h3{ color:#fff; }
.rule-formula{
  font-family: var(--font-mono); background: rgba(255,255,255,0.14);
  padding:14px 18px; border-radius:10px; font-size:1.02rem; margin-top:12px;
}

table.data-table{ width:100%; border-collapse:collapse; margin: 16px 0; font-size:.95rem; }
table.data-table th{
  background: var(--indigo); color:#fff; text-align:left; padding:12px 14px;
  font-family: var(--font-display); font-weight:600; font-size:.9rem;
}
table.data-table td{ padding:11px 14px; border-bottom:1px solid var(--line); }
table.data-table tr:nth-child(even) td{ background: var(--paper-2); }

.equation-box{
  text-align:center; background: var(--indigo-deep); color:#fff; border-radius: var(--radius);
  padding: 30px; font-family: var(--font-mono); font-size: clamp(1.2rem,3vw,1.7rem);
  margin: 20px 0; box-shadow: var(--shadow-lg);
}
.equation-box .eq-sub{ font-family: var(--font-body); font-size:.9rem; opacity:.8; margin-top:8px; font-weight:600;}

.qbox{
  background: var(--gold); color: var(--indigo-deep); border-radius:14px;
  padding:16px 20px; font-weight:800; margin:18px 0 6px;
}

.nav-pager{
  display:flex; justify-content:space-between; gap:16px; margin-top: 40px; flex-wrap:wrap;
}
.pager-link{
  flex:1; min-width:220px; background:#fff; border-radius: var(--radius-sm);
  padding:16px 20px; text-decoration:none; color:var(--ink); box-shadow: var(--shadow);
  border:1px solid var(--line);
}
.pager-link small{ display:block; color: var(--indigo); font-weight:800; font-size:.75rem; text-transform:uppercase; letter-spacing:.05em; margin-bottom:4px;}
.pager-link.next{ text-align:right; }

/* ---------- Footer ---------- */
footer{ background: var(--indigo-deep); color:#fff; padding: 46px 0 30px; }
.footer-grid{ display:grid; grid-template-columns: 1.3fr 1fr 1fr; gap:32px; }
@media (max-width:780px){ .footer-grid{ grid-template-columns:1fr; } }
footer h4{ color: var(--gold); font-size:1rem; margin-bottom:14px; }
footer a{ color:#fff; opacity:.85; text-decoration:none; display:block; margin-bottom:8px; font-weight:600; font-size:.94rem;}
footer a:hover{ opacity:1; text-decoration:underline; }
.foot-bottom{ text-align:center; margin-top:34px; padding-top:22px; border-top:1px solid rgba(255,255,255,0.15); opacity:.75; font-size:.85rem;}

.whatsapp-fab{
  position:fixed; bottom:22px; right:22px; z-index:60;
  background: var(--credit); color:#fff; width:60px; height:60px; border-radius:50%;
  display:flex; align-items:center; justify-content:center; box-shadow: var(--shadow-lg);
  text-decoration:none; font-size:1.7rem;
}

@media (max-width: 600px){
  body{ font-size:17.5px; }
  .card{ padding:22px 18px; }
  .hero{ padding:48px 0 40px; }
}