/* ========================================
   BacaBuku — Shared Styles
   Mobile-first, reading-optimized
   ======================================== */

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

/* --- Custom Properties --- */
:root{
  /* Colors */
  --bg:#FAFAF7;
  --bg-card:#FFFFFF;
  --bg-warm:#F3F0E8;
  --bg-accent:#EDF5F3;
  --text:#1C1C1C;
  --text-2:#4A4A4A;
  --text-muted:#888;
  --border:#E0DBD2;
  --accent:#1B6B5A;
  --accent-soft:#D6EDE8;
  --accent-glow:rgba(27,107,90,.07);
  --gold:#B8860B;
  --gold-soft:#FFF5DC;
  --hero-bg:linear-gradient(170deg,#1A1A1A 0%,#1F2A24 50%,#243028 100%);
  --hero-accent:#3DB89F;
  /* Typography */
  --serif:'Lora',Georgia,'Times New Roman',serif;
  --sans:'Inter',-apple-system,system-ui,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono','Fira Code',monospace;
  /* Spacing */
  --content-max:660px;
  --px:1.25rem;
  --section-gap:3rem;
}

/* --- Base --- */
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  font-size:17px;
}
body{
  font-family:var(--sans);
  line-height:1.78;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

/* Safe area for notched devices */
@supports(padding:max(0px)){
  body{
    padding-left:env(safe-area-inset-left);
    padding-right:env(safe-area-inset-right);
  }
}

/* --- Selection --- */
::selection{
  background:var(--accent-soft);
  color:var(--text);
}

/* --- Links --- */
a{color:var(--accent);text-decoration:none;transition:opacity .2s}
a:hover{opacity:.75}

/* ========================================
   Progress Bar
   ======================================== */
.progress-bar{
  position:fixed;top:0;left:0;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--gold));
  width:0%;z-index:1000;
  transition:width .12s linear;
  will-change:width;
}

/* ========================================
   Floating Nav
   ======================================== */
.floating-nav{
  position:fixed;bottom:1.5rem;right:1rem;z-index:999;
  display:flex;flex-direction:column;gap:.6rem;
}
.floating-nav button{
  width:44px;height:44px;border-radius:50%;border:none;
  background:var(--accent);color:#fff;
  font-size:1.1rem;cursor:pointer;
  box-shadow:0 2px 12px rgba(0,0,0,.18);
  transition:transform .2s,opacity .2s;
  display:flex;align-items:center;justify-content:center;
}
.floating-nav button:active{transform:scale(.92)}

/* ========================================
   TOC Panel
   ======================================== */
.toc-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.4);
  z-index:1001;opacity:0;pointer-events:none;
  transition:opacity .3s;
  -webkit-backdrop-filter:blur(2px);
  backdrop-filter:blur(2px);
}
.toc-overlay.open{opacity:1;pointer-events:auto}
.toc-panel{
  position:fixed;top:0;right:0;bottom:0;width:280px;max-width:85vw;
  background:var(--bg);z-index:1002;
  transform:translateX(100%);transition:transform .3s ease;
  padding:1.5rem;overflow-y:auto;
  box-shadow:-4px 0 24px rgba(0,0,0,.12);
}
.toc-panel.open{transform:translateX(0)}
.toc-close{
  position:absolute;top:1rem;right:1rem;
  width:36px;height:36px;border-radius:50%;
  border:none;background:var(--bg-warm);
  font-size:1.2rem;cursor:pointer;
  color:var(--text-muted);
  display:flex;align-items:center;justify-content:center;
}
.toc-panel h3{
  font-family:var(--serif);font-size:1.1rem;
  margin-bottom:1.25rem;color:var(--text);
}
.toc-panel nav{display:flex;flex-direction:column;gap:.15rem}
.toc-panel nav a{
  display:block;padding:.45rem .6rem;border-radius:6px;
  font-size:.85rem;color:var(--text-2);
  transition:background .15s;
  line-height:1.4;
}
.toc-panel nav a:hover,
.toc-panel nav a:active{
  background:var(--bg-warm);opacity:1;
}
.toc-panel nav a.part-link{
  font-family:var(--mono);font-size:.7rem;
  font-weight:600;letter-spacing:.1em;
  text-transform:uppercase;color:var(--accent);
  margin-top:.75rem;padding-left:.6rem;
}
.toc-panel nav a.part-link:first-child{margin-top:0}

/* ========================================
   Hero Section
   ======================================== */
.hero{
  min-height:100svh;
  display:flex;flex-direction:column;
  justify-content:center;align-items:center;
  text-align:center;
  padding:2rem var(--px);
  position:relative;
  background:var(--hero-bg);
  overflow:hidden;
}
.hero::before{
  content:'';position:absolute;
  top:-50%;left:-50%;width:200%;height:200%;
  background:radial-gradient(ellipse at 50% 50%,rgba(61,184,159,.06) 0%,transparent 60%);
  animation:heroPulse 8s ease-in-out infinite;
}
@keyframes heroPulse{
  0%,100%{transform:scale(1);opacity:.4}
  50%{transform:scale(1.1);opacity:1}
}
.hero-label{
  font-family:var(--mono);font-size:.65rem;
  letter-spacing:.25em;text-transform:uppercase;
  color:var(--hero-accent);
  margin-bottom:2rem;position:relative;z-index:1;
  opacity:0;animation:fadeUp .7s .2s forwards;
}
.hero-title{
  font-family:var(--serif);
  font-size:clamp(2.6rem,10vw,4.2rem);
  color:#FAFAF7;line-height:1.08;
  letter-spacing:-.02em;
  margin-bottom:.6rem;position:relative;z-index:1;
  opacity:0;animation:fadeUp .7s .4s forwards;
}
.hero-subtitle{
  font-family:var(--serif);font-style:italic;
  font-size:clamp(.95rem,3.5vw,1.25rem);
  color:var(--hero-accent);opacity:0;
  margin-bottom:2rem;position:relative;z-index:1;
  animation:fadeUp .7s .6s forwards;
}
.hero-author{
  font-size:.82rem;color:rgba(250,250,247,.4);
  letter-spacing:.12em;text-transform:uppercase;
  position:relative;z-index:1;
  opacity:0;animation:fadeUp .7s .8s forwards;
}
.hero-quote{
  max-width:440px;margin-top:2.5rem;
  padding:1rem 1.25rem;
  border-left:2px solid var(--hero-accent);
  text-align:left;position:relative;z-index:1;
  opacity:0;animation:fadeUp .7s 1s forwards;
}
.hero-quote p{
  font-family:var(--serif);font-style:italic;
  font-size:.95rem;color:rgba(250,250,247,.6);
  line-height:1.6;
}
.scroll-cue{
  position:absolute;bottom:2rem;left:50%;
  transform:translateX(-50%);z-index:1;
  opacity:0;animation:fadeUp .7s 1.3s forwards;
}
.scroll-cue span{
  display:block;width:1px;height:36px;
  background:linear-gradient(to bottom,var(--hero-accent),transparent);
  margin:0 auto;
  animation:scrollBob 2s ease-in-out infinite;
}
@keyframes scrollBob{
  0%,100%{opacity:.3;transform:scaleY(1)}
  50%{opacity:1;transform:scaleY(1.3)}
}
@keyframes fadeUp{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:translateY(0)}
}

/* ========================================
   Content Wrapper
   ======================================== */
.content{
  max-width:var(--content-max);
  margin:0 auto;padding:0 var(--px);
}

/* ========================================
   Part Banner
   ======================================== */
.part-banner{
  margin:var(--section-gap) calc(var(--px) * -1) 0;
  padding:2.5rem var(--px);
  text-align:center;
  border-radius:0;
}
.part-banner.state{background:linear-gradient(135deg,#E8F5F2,#D6EDE8)}
.part-banner.action{background:linear-gradient(135deg,#FFF5DC,#F5E6B8)}
.part-banner.results{background:linear-gradient(135deg,#EDE8F5,#DDD6ED)}
.part-banner.essence{background:linear-gradient(135deg,#FFF5DC,#F5E6B8)}
.part-banner.explore{background:linear-gradient(135deg,#DCE9F2,#C8DCF0)}
.part-banner.eliminate{background:linear-gradient(135deg,#F5E0DE,#F0CDCA)}
.part-banner.execute{background:linear-gradient(135deg,#DAF0E1,#C8E8D2)}

.part-num{
  font-family:var(--mono);font-size:.62rem;
  letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);margin-bottom:.4rem;
}
.part-banner h2{
  font-family:var(--serif);font-size:1.4rem;
  color:var(--text);line-height:1.3;
  margin-bottom:.3rem;
}
.part-banner p{
  font-size:.85rem;color:var(--text-2);
}

/* ========================================
   Chapter / Section
   ======================================== */
.chapter{
  padding:var(--section-gap) 0 2rem;
  border-bottom:1px solid var(--border);
}
.chapter:last-child{border-bottom:none}
.section-num{
  display:block;font-family:var(--mono);
  font-size:.7rem;letter-spacing:.1em;
  color:var(--accent);margin-bottom:.5rem;
  font-weight:600;
}
.section-title{
  font-family:var(--serif);
  font-size:1.35rem;line-height:1.35;
  color:var(--text);margin-bottom:1.25rem;
}

/* ========================================
   Typography inside chapters
   ======================================== */
.chapter p{
  margin-bottom:1rem;color:var(--text);
  font-size:.95rem;
}
.chapter h3{
  font-family:var(--serif);
  font-size:1.08rem;line-height:1.4;
  color:var(--text);margin:1.8rem 0 .8rem;
}
.chapter ul,.chapter ol{
  margin:1rem 0;padding-left:1.4rem;
}
.chapter li{
  margin-bottom:.7rem;font-size:.95rem;
  color:var(--text);line-height:1.7;
}
.chapter li strong{color:var(--text)}
.chapter strong{color:var(--text)}
.chapter em{font-style:italic}

/* ========================================
   Quote Block
   ======================================== */
.quote{
  margin:1.5rem 0;
  padding:1rem 1.25rem;
  border-left:3px solid var(--accent);
  background:var(--accent-glow);
  border-radius:0 8px 8px 0;
}
.quote p{
  font-family:var(--serif);font-style:italic;
  font-size:.95rem;color:var(--text-2);
  line-height:1.65;margin-bottom:0 !important;
}

/* ========================================
   Key Concept Box
   ======================================== */
.key-concept{
  background:var(--bg-warm);border-radius:10px;
  padding:1.2rem 1.25rem;margin:1.5rem 0;
  border:1px solid var(--border);
}
.key-concept .label{
  font-family:var(--mono);font-size:.65rem;font-weight:600;
  color:var(--accent);letter-spacing:.12em;text-transform:uppercase;
  margin-bottom:.5rem;display:block;
}
.key-concept h3{margin-top:0 !important;margin-bottom:.5rem}
.key-concept p{font-size:.92rem}
.key-concept ul{margin:.5rem 0;padding-left:1.2rem}
.key-concept li{font-size:.92rem;margin-bottom:.5rem}

/* ========================================
   Highlight Box (golden)
   ======================================== */
.highlight-box{
  margin:1.5rem 0;padding:1rem 1.25rem;
  background:var(--gold-soft);
  border-radius:8px;border-left:3px solid var(--gold);
}
.highlight-box p{
  font-family:var(--serif);font-style:italic;
  font-size:.95rem;color:var(--text);
  line-height:1.6;margin-bottom:0 !important;
}

/* ========================================
   Tables
   ======================================== */
.table-wrap{
  overflow-x:auto;margin:1.5rem -.25rem;
  -webkit-overflow-scrolling:touch;
  border-radius:8px;
}
table{
  width:100%;border-collapse:collapse;
  font-size:.85rem;min-width:420px;
}
thead{background:var(--accent)}
th{
  color:#fff;font-weight:600;text-align:left;
  padding:.65rem .75rem;font-size:.78rem;
  letter-spacing:.02em;white-space:nowrap;
}
td{
  padding:.6rem .75rem;
  border-bottom:1px solid var(--border);
  vertical-align:top;color:var(--text);
  line-height:1.6;
}
tr:nth-child(even){background:var(--bg-warm)}

/* ========================================
   Definition Items
   ======================================== */
.def-item{margin-bottom:1rem}
.def-item strong{color:var(--text)}
.def-item p{font-size:.95rem}

/* ========================================
   Reflection Group
   ======================================== */
.reflection-group{
  background:var(--bg-accent);
  border-radius:12px;padding:1.25rem;margin:1.5rem 0;
  border:1px solid var(--border);
}
.reflection-group h3{
  font-family:var(--serif);font-size:1rem;
  margin-top:0;margin-bottom:.8rem;
}
.reflection-group li{
  font-size:.92rem;color:var(--text);margin-bottom:.7rem;
}

/* ========================================
   Accordion (for compact chapter summaries)
   ======================================== */
.part-group{margin-bottom:2rem}
.part-label{
  font-family:var(--mono);font-size:.62rem;
  letter-spacing:.18em;text-transform:uppercase;
  padding:.4rem .75rem;border-radius:4px;
  display:inline-block;margin-bottom:.75rem;
  font-weight:600;
}
.part-group.essence .part-label{background:var(--gold-soft);color:var(--gold)}
.part-group.explore .part-label{background:#DCE9F2;color:#2D5A7B}
.part-group.eliminate .part-label{background:#F5E0DE;color:#A0453E}
.part-group.execute .part-label{background:#DAF0E1;color:#4A7C59}

.accordion{
  border:1px solid var(--border);border-radius:10px;
  margin-bottom:.5rem;overflow:hidden;
  background:var(--bg-card);
}
.accordion-toggle{
  width:100%;background:none;border:none;
  padding:.9rem 1.1rem;display:flex;
  align-items:center;gap:.75rem;
  cursor:pointer;text-align:left;
  font-family:var(--sans);
  transition:background .15s;
  -webkit-tap-highlight-color:transparent;
}
.accordion-toggle:hover,
.accordion-toggle:active{background:var(--bg-warm)}
.acc-num{
  font-family:var(--mono);font-size:.62rem;
  color:var(--text-muted);flex-shrink:0;width:22px;
}
.acc-title{
  font-family:var(--serif);font-size:.95rem;
  color:var(--text);flex:1;line-height:1.4;
}
.acc-arrow{
  font-size:.7rem;color:var(--text-muted);
  transition:transform .3s;flex-shrink:0;
}
.accordion.open .acc-arrow{transform:rotate(180deg)}
.accordion-body{
  max-height:0;overflow:hidden;
  transition:max-height .4s ease;
}
.accordion-inner{
  padding:0 1.1rem 1.1rem;
  padding-left:calc(1.1rem + 22px + .75rem);
}
.accordion-inner p{
  font-size:.9rem;color:var(--text-2);
  line-height:1.75;margin-bottom:.6rem;
}
.accordion-inner p:last-child{margin-bottom:0}
.accordion-inner strong{color:var(--text)}
.ch-highlight{
  padding:.7rem .9rem;background:var(--bg-warm);
  border-radius:6px;font-family:var(--serif);
  font-style:italic;font-size:.88rem;
  color:var(--text);line-height:1.6;
  margin:.6rem 0;
}

/* ========================================
   Step Cards (for frameworks)
   ======================================== */
.step-cards{
  display:flex;flex-direction:column;gap:.75rem;
  margin:1.5rem 0;
}
.step-card{
  border:1px solid var(--border);border-radius:10px;
  background:var(--bg-card);overflow:hidden;
  padding:1.1rem 1.25rem;
}
.step-header{
  display:flex;align-items:flex-start;gap:.75rem;
  margin-bottom:.6rem;
}
.step-num{
  flex-shrink:0;width:32px;height:32px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:.7rem;font-weight:700;
  color:#fff;
}
.step-num.c1{background:#2D5A7B}
.step-num.c2{background:#A0453E}
.step-num.c3{background:#4A7C59}
.step-header h3{
  font-family:var(--serif);font-size:1.05rem;
  line-height:1.3;margin:0;
}
.step-header h3 em{
  font-style:italic;opacity:.5;font-weight:normal;
  font-size:.85em;
}
.step-body p{
  font-size:.9rem;color:var(--text-2);line-height:1.7;
  margin-bottom:.5rem;
}
.step-key{
  margin-top:.6rem;padding:.5rem .75rem;border-radius:6px;
  font-size:.8rem;line-height:1.5;
  background:var(--bg-warm);color:var(--text-2);
}

/* ========================================
   Concept Grid (for key concepts list)
   ======================================== */
.concept-item{
  padding:1rem 0;
  border-bottom:1px solid var(--border);
}
.concept-item:last-child{border-bottom:none}
.concept-name{
  font-family:var(--serif);font-size:1rem;
  color:var(--text);margin-bottom:.3rem;
  display:flex;align-items:center;gap:.5rem;
}
.concept-icon{
  width:28px;height:28px;border-radius:6px;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-warm);flex-shrink:0;
  font-size:1rem;
}
.concept-desc{
  font-size:.9rem;color:var(--text-2);line-height:1.7;
  padding-left:calc(28px + .5rem);
}

/* ========================================
   Mindset Grid (comparison)
   ======================================== */
.mindset-grid{
  display:flex;flex-direction:column;gap:.6rem;
  margin:1rem 0;
}
.mindset-row{
  display:grid;grid-template-columns:1fr 1fr;gap:.6rem;
}
.mindset-cell{
  padding:.85rem .9rem;border-radius:8px;
  font-size:.85rem;line-height:1.5;
}
.mindset-cell.non{
  background:var(--bg-warm);color:var(--text-muted);
  text-decoration:line-through;
  text-decoration-color:rgba(0,0,0,.12);
}
.mindset-cell.ess{
  background:var(--gold-soft);color:var(--text);
  font-weight:500;border:1px solid rgba(184,134,11,.15);
}
.mindset-label{
  font-family:var(--mono);font-size:.55rem;
  letter-spacing:.12em;text-transform:uppercase;
  display:block;margin-bottom:.25rem;opacity:.6;
  text-decoration:none !important;
}

/* ========================================
   Tool Items
   ======================================== */
.tool-item{
  padding:.85rem 1rem;background:var(--bg-card);
  border:1px solid var(--border);border-radius:8px;
  margin-bottom:.5rem;
}
.tool-name{
  font-family:var(--mono);font-size:.75rem;
  font-weight:600;color:var(--accent);
  margin-bottom:.2rem;
}
.tool-desc{
  font-size:.85rem;color:var(--text-2);line-height:1.6;
}

/* ========================================
   Footer
   ======================================== */
.site-footer{
  text-align:center;padding:var(--section-gap) var(--px) 4rem;
  border-top:1px solid var(--border);
  margin-top:2rem;
}
.closing-quote{
  font-family:var(--serif);font-style:italic;
  color:var(--accent);font-size:1.05rem;
  margin-bottom:.4rem;line-height:1.5;
  max-width:400px;margin-left:auto;margin-right:auto;
}
.site-footer .footer-attr{
  font-size:.78rem;color:var(--text-muted);
  letter-spacing:.04em;
}
.site-footer .footer-meta{
  margin-top:1.5rem;font-size:.68rem;
  color:var(--text-muted);opacity:.5;
}
.back-link{
  display:inline-flex;align-items:center;gap:.4rem;
  font-size:.82rem;color:var(--accent);
  margin-bottom:1.5rem;padding:.4rem 0;
}

/* ========================================
   Scroll Animations
   ======================================== */
.fade-in{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s ease,transform .5s ease;
}
.fade-in.visible{
  opacity:1;transform:translateY(0);
}

/* ========================================
   Index Page — Book Grid
   ======================================== */
.index-hero{
  padding:3rem var(--px) 2rem;text-align:center;
  background:var(--hero-bg);
}
.index-hero h1{
  font-family:var(--serif);
  font-size:clamp(1.8rem,6vw,2.6rem);
  color:#FAFAF7;line-height:1.15;
  margin-bottom:.5rem;
  opacity:0;animation:fadeUp .7s .2s forwards;
}
.index-hero p{
  font-size:.9rem;color:rgba(250,250,247,.5);
  opacity:0;animation:fadeUp .7s .4s forwards;
}
.book-grid{
  display:grid;gap:1rem;
  padding:2rem var(--px);
  max-width:720px;margin:0 auto;
}
.book-card{
  display:block;
  border:1px solid var(--border);border-radius:12px;
  background:var(--bg-card);overflow:hidden;
  transition:transform .2s,box-shadow .2s;
  text-decoration:none;color:inherit;
}
.book-card:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(0,0,0,.08);
  opacity:1;
}
.book-card:active{transform:scale(.99)}
.book-card-cover{
  padding:2rem 1.5rem;text-align:center;
  min-height:160px;display:flex;
  flex-direction:column;justify-content:center;
}
.book-card-cover h2{
  font-family:var(--serif);
  font-size:1.5rem;line-height:1.2;
  margin-bottom:.3rem;
}
.book-card-cover .book-sub{
  font-family:var(--serif);font-style:italic;
  font-size:.85rem;opacity:.7;
}
.book-card-info{
  padding:1rem 1.25rem;
  border-top:1px solid var(--border);
}
.book-card-info .book-author{
  font-size:.82rem;color:var(--text-muted);
  letter-spacing:.08em;text-transform:uppercase;
  margin-bottom:.4rem;
}
.book-card-info .book-desc{
  font-size:.88rem;color:var(--text-2);line-height:1.6;
}
.book-card-info .book-tag{
  display:inline-block;margin-top:.6rem;
  font-family:var(--mono);font-size:.62rem;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);background:var(--accent-soft);
  padding:.25rem .5rem;border-radius:3px;
}

/* Book-specific cover colors */
.book-card.essentialism .book-card-cover{
  background:linear-gradient(135deg,#1A1A1A,#2A2520);
  color:#FAFAF7;
}
.book-card.effortless .book-card-cover{
  background:linear-gradient(135deg,#1B2A4A,#1A3A3A);
  color:#FAFAF7;
}

/* ========================================
   Responsive
   ======================================== */
@media(min-width:640px){
  html{font-size:18px}
  .hero{min-height:85vh}
  .part-banner{
    margin-left:-2rem;margin-right:-2rem;
    padding-left:2rem;padding-right:2rem;
    border-radius:12px;
  }
  .book-grid{grid-template-columns:1fr 1fr}
  .index-hero{padding:5rem var(--px) 3rem}
}

@media(max-width:480px){
  :root{--px:1rem}
  html{font-size:16px}
  .hero{min-height:92svh}
  .floating-nav{bottom:1rem;right:.75rem}
  .toc-panel{width:260px}
  .mindset-row{grid-template-columns:1fr}
  .table-wrap{margin-left:-.5rem;margin-right:-.5rem}
  table{min-width:360px;font-size:.82rem}
  th,td{padding:.5rem .6rem}
}

/* ========================================
   Safe Area (bottom for floating nav)
   ======================================== */
@supports(padding:max(0px)){
  .floating-nav{
    bottom:max(1.5rem,env(safe-area-inset-bottom));
    right:max(1rem,env(safe-area-inset-right));
  }
  .site-footer{
    padding-bottom:max(4rem,calc(env(safe-area-inset-bottom) + 2rem));
  }
}