/* =========================================================
   SIBI — Sistem Informasi Buku Indonesia (clone edukasi)
   style.css — design tokens + komponen bersama
   ========================================================= */

:root{
  /* "Perpustakaan Senja" — hijau zaitun + terracotta di atas kertas krem,
     menggantikan navy-gold korporat dengan nuansa lebih hangat & bertekstur. */
  --navy-900:#2A2E1F;   /* olive-900 — teks utama, elemen paling gelap */
  --navy-800:#3D4530;   /* olive-700 — primary: tombol, nav aktif */
  --navy-700:#526042;   /* olive-500 — hover state primary */
  --blue-accent:#5C6B47;
  --gold:#C1603E;       /* terracotta — pengganti gold, aksen utama */
  --gold-dark:#9C4B30;  /* terracotta-dark */
  --red:#A83B32;        /* ruby — pengganti red */
  --maroon:#A83B32;     /* ruby — error */
  --teal:#2F6B52;       /* pine — sukses */

  --bg:#F3EDDD;         /* sand — background utama, kertas krem */
  --surface:#FBF8EF;    /* sand terang — kartu/permukaan */
  --surface-alt:#E9E0C7;/* sand-alt — section alternatif */
  --border:#DCD2B4;     /* garis, hangat bukan abu-abu dingin */
  --text:#2A2E1F;
  --text-muted:#5B5F4B;
  --text-soft:#83866E;

  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;
  --shadow-sm:0 1px 3px rgba(42,46,31,.10);
  --shadow-md:0 8px 24px rgba(42,46,31,.12);
  --shadow-lg:0 20px 48px rgba(42,46,31,.20);

  --font-display:'Fraunces', 'Georgia', serif;
  --font-body:'Plus Jakarta Sans', 'Segoe UI', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --header-h:76px;
  --container:1180px;
}

[data-theme="dark"]{
  --bg:#181C12;
  --surface:#22271A;
  --surface-alt:#2B3121;
  --border:#3A4130;
  --text:#EFE9D6;
  --text-muted:#B7BBA1;
  --text-soft:#868C71;
  --gold:#D97A52;
  --gold-dark:#E89873;
  --navy-700:#7C8F63;
  --shadow-sm:0 1px 3px rgba(0,0,0,.35);
  --shadow-md:0 8px 24px rgba(0,0,0,.45);
  --shadow-lg:0 20px 48px rgba(0,0,0,.55);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  transition:background .25s ease, color .25s ease;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
button{font-family:inherit;cursor:pointer;}
input,select,textarea{font-family:inherit;}

::selection{background:var(--gold);color:var(--navy-900);}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important;}
}

:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:4px;}

.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:24px;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gold-dark);
  font-weight:600;
}
[data-theme="dark"] .eyebrow{color:var(--gold);}

h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--navy-900);
  margin:0 0 .5em;
  line-height:1.15;
}
[data-theme="dark"] h1,[data-theme="dark"] h2,[data-theme="dark"] h3,[data-theme="dark"] h4{color:#F4F7FC;}
p{line-height:1.65;color:var(--text-muted);margin:0 0 1em;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;border:1px solid transparent;
  font-weight:700;font-size:.92rem;transition:transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease, border-color .15s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--navy-800);color:#fff;}
.btn-primary:hover{background:var(--navy-700);transform:translateY(-1px);box-shadow:var(--shadow-md);}
.btn-gold{background:var(--gold);color:var(--navy-900);}
.btn-gold:hover{background:var(--gold-dark);transform:translateY(-1px);box-shadow:var(--shadow-md);}
.btn-outline{background:transparent;border-color:var(--border);color:var(--text);}
.btn-outline:hover{border-color:var(--navy-800);}
.btn-ghost{background:transparent;color:var(--navy-800);}
[data-theme="dark"] .btn-ghost{color:#fff;}
.btn-ghost:hover{background:var(--surface-alt);}
.btn-block{width:100%;}
.btn-sm{padding:8px 16px;font-size:.82rem;}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none !important;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  height:var(--header-h);
  background:var(--surface);
  border-bottom:1px solid var(--border);
  backdrop-filter:saturate(180%) blur(8px);
}
.site-header .container{
  height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:11px;}
.brand img{width:40px;height:40px;}
.brand-text{display:flex;flex-direction:column;line-height:1.05;}
.brand-text strong{font-family:var(--font-display);font-size:1.28rem;color:var(--navy-900);}
[data-theme="dark"] .brand-text strong{color:#fff;}
.brand-text span{font-size:.66rem;color:var(--text-soft);letter-spacing:.03em;}

.main-nav{display:flex;align-items:center;gap:6px;}
.main-nav a{
  padding:10px 14px;border-radius:999px;font-weight:600;font-size:.92rem;color:var(--text-muted);
  transition:background .15s ease,color .15s ease;
}
.main-nav a:hover,.main-nav a.active{background:var(--surface-alt);color:var(--navy-800);}
[data-theme="dark"] .main-nav a:hover,[data-theme="dark"] .main-nav a.active{color:#fff;}

.header-actions{display:flex;align-items:center;gap:10px;}
.icon-btn{
  width:42px;height:42px;border-radius:50%;border:1px solid var(--border);
  background:var(--surface);display:flex;align-items:center;justify-content:center;
  color:var(--text-muted);transition:all .15s ease;
}
.icon-btn:hover{border-color:var(--navy-800);color:var(--navy-800);}
[data-theme="dark"] .icon-btn:hover{color:#fff;}
.icon-btn svg{width:19px;height:19px;}
.icon-btn .icon-moon{display:none;}
[data-theme="dark"] .icon-btn .icon-sun{display:none;}
[data-theme="dark"] .icon-btn .icon-moon{display:block;}

.user-chip{display:flex;align-items:center;gap:8px;padding:5px 14px 5px 6px;border-radius:999px;background:var(--surface-alt);font-weight:700;font-size:.85rem;}
.user-chip .avatar{width:30px;height:30px;border-radius:50%;background:var(--navy-800);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.78rem;font-family:var(--font-display);}

.nav-toggle{display:none;background:none;border:none;color:var(--text);padding:6px;}
.nav-toggle svg{width:26px;height:26px;}

/* ---------- Hero ---------- */
.hero{
  padding:64px 0 56px;
  background:
    radial-gradient(circle at 85% 0%, rgba(193,96,62,.08), transparent 55%),
    linear-gradient(180deg,var(--surface) 0%, var(--bg) 100%);
  border-bottom:1px solid var(--border);
  overflow:hidden;
}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;}
.hero h1{font-size:clamp(2.1rem,3.4vw,3.1rem);}
.hero h1 em{font-style:normal;color:var(--red);}
[data-theme="dark"] .hero h1 em{color:var(--gold);}
.hero p.lead{font-size:1.05rem;max-width:46ch;}
.hero-art{position:relative;}
.hero-art img{width:100%;height:auto;}
.hero-art .badge-float{
  position:absolute;top:-14px;right:8px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:10px 16px;box-shadow:var(--shadow-md);
  font-size:.78rem;font-weight:700;display:flex;align-items:center;gap:8px;
}
.hero-art .badge-float span.dot{width:8px;height:8px;border-radius:50%;background:var(--teal);}

.search-box{
  display:flex;align-items:center;gap:8px;background:var(--surface);
  border:1.5px solid var(--border);border-radius:999px;padding:6px 6px 6px 20px;
  max-width:560px;margin:26px 0 18px;box-shadow:var(--shadow-sm);
}
.search-box svg{width:19px;height:19px;color:var(--text-soft);flex-shrink:0;}
.search-box input{
  flex:1;border:none;background:transparent;outline:none;padding:10px 6px;
  font-size:.95rem;color:var(--text);
}
.search-box .btn{padding:11px 24px;}

.chip-row{display:flex;flex-wrap:wrap;gap:9px;}
.chip{
  padding:8px 16px;border-radius:999px;border:1px solid var(--border);background:var(--surface);
  font-size:.82rem;font-weight:700;color:var(--text-muted);transition:all .15s ease;
}
.chip:hover{border-color:var(--navy-800);color:var(--navy-800);}
[data-theme="dark"] .chip:hover{color:#fff;}
.chip.active{background:var(--navy-800);color:#fff;border-color:var(--navy-800);}

/* ---------- Stat strip ---------- */
.stat-strip{background:var(--navy-900);color:#fff;padding:34px 0;}
.stat-strip .container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px;}
.stat-item{text-align:left;}
.stat-item strong{display:block;font-family:var(--font-display);font-size:2rem;color:var(--gold);}
.stat-item span{font-size:.8rem;color:#C9CDB4;letter-spacing:.02em;}

/* ---------- Sections ---------- */
.section{padding:64px 0;}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:30px;flex-wrap:wrap;}
.section-head h2{font-size:clamp(1.5rem,2.4vw,2rem);margin:0;}
.section-head p{margin:0;}
.section-alt{background:var(--surface-alt);}

/* ---------- Category cards ---------- */
.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.category-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:22px;transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.category-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:transparent;}
.category-card .icon{
  width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  margin-bottom:14px;color:#fff;font-family:var(--font-display);font-weight:700;
}
.category-card h3{font-size:1.02rem;margin-bottom:4px;}
.category-card span{font-size:.8rem;color:var(--text-soft);}

/* ---------- Book grid & cards ---------- */
.book-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.book-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);
  overflow:hidden;display:flex;flex-direction:column;transition:transform .18s ease, box-shadow .18s ease;
}
.book-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);}
.book-cover{
  aspect-ratio:3/4;position:relative;display:flex;align-items:flex-end;padding:16px;
  color:#fff;overflow:hidden;
}
.book-cover::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,.55) 100%);
}
.book-cover .jenjang-tag{
  position:absolute;top:10px;left:10px;background:rgba(255,255,255,.92);color:var(--navy-900);
  font-family:var(--font-mono);font-size:.65rem;font-weight:700;padding:3px 9px;border-radius:999px;letter-spacing:.03em;z-index:2;
}
.book-cover .cover-title{position:relative;z-index:2;font-family:var(--font-display);font-weight:700;font-size:1rem;line-height:1.25;}
.book-fav{
  position:absolute;top:10px;right:10px;z-index:2;width:30px;height:30px;border-radius:50%;
  background:rgba(255,255,255,.92);border:none;display:flex;align-items:center;justify-content:center;color:var(--navy-900);
}
.book-fav svg{width:15px;height:15px;}
.book-fav.active svg{fill:var(--red);color:var(--red);}
.book-info{padding:14px 16px 16px;flex:1;display:flex;flex-direction:column;gap:6px;}
.book-info .mapel{font-family:var(--font-mono);font-size:.68rem;color:var(--text-soft);text-transform:uppercase;letter-spacing:.04em;}
.book-info h4{margin:0;font-family:var(--font-body);font-size:.94rem;font-weight:700;color:var(--text);line-height:1.35;}
.book-info .author{font-size:.8rem;color:var(--text-muted);}
.book-meta-row{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:8px;font-size:.76rem;color:var(--text-soft);}
.book-meta-row span{display:flex;align-items:center;gap:4px;}
.book-meta-row svg{width:13px;height:13px;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-900);color:#D9D6C2;padding:56px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:32px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand .brand-text strong{color:#fff;}
.footer-brand p{color:#B4B096;font-size:.88rem;max-width:34ch;}
.site-footer h5{color:#fff;font-family:var(--font-body);font-size:.86rem;letter-spacing:.03em;margin-bottom:14px;}
.site-footer ul li{margin-bottom:10px;}
.site-footer a{color:#B4B096;font-size:.88rem;transition:color .15s ease;}
.site-footer a:hover{color:var(--gold);}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:22px;font-size:.78rem;color:#8B8870;}
.social-row{display:flex;gap:10px;}
.social-row a{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.06);display:flex;align-items:center;justify-content:center;}
.social-row svg{width:16px;height:16px;}

/* ---------- Generic form field (used by login/register too) ---------- */
.field{margin-bottom:18px;}
.field label{display:block;font-size:.85rem;font-weight:700;margin-bottom:7px;color:var(--text);}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border-radius:var(--radius-sm);border:1.5px solid var(--border);
  background:var(--surface);color:var(--text);font-size:.92rem;transition:border-color .15s ease;
}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--navy-800);outline:none;}
.field-error{color:var(--maroon);font-size:.78rem;margin-top:6px;display:none;}
.field.invalid input{border-color:var(--maroon);}
.field.invalid .field-error{display:block;}
.field-hint{font-size:.78rem;color:var(--text-soft);margin-top:6px;}

/* toast */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--navy-900);color:#fff;padding:14px 22px;border-radius:999px;font-size:.86rem;font-weight:600;
  box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:all .25s ease;z-index:999;display:flex;align-items:center;gap:10px;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}
.toast.error{background:var(--maroon);}
.toast.success{background:var(--teal);}

/* CTA band */
.cta-band{
  background:linear-gradient(120deg,var(--navy-900),var(--navy-700));
  border:1px dashed rgba(255,255,255,.18);
  border-radius:var(--radius-lg);padding:48px;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
}
.cta-band h2{color:#fff;font-size:1.7rem;max-width:26ch;}
.cta-band p{color:#D9D6C2;max-width:40ch;}

.skeleton{background:linear-gradient(90deg,var(--surface-alt) 25%,var(--border) 37%,var(--surface-alt) 63%);background-size:400% 100%;animation:shimmer 1.4s ease infinite;}
@keyframes shimmer{0%{background-position:100% 50%;}100%{background-position:0 50%;}}

.empty-state{text-align:center;padding:60px 20px;}
.empty-state img{margin:0 auto 18px;}
.empty-state h3{margin-bottom:6px;}

/* ---------- Katalog (buku.html) ---------- */
.catalog-hero{padding:40px 0 28px;border-bottom:1px solid var(--border);}
.catalog-layout{display:grid;grid-template-columns:260px 1fr;gap:32px;padding:36px 0 64px;align-items:start;}
.catalog-sidebar{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:22px;position:sticky;top:calc(var(--header-h) + 20px);
}
.filter-block{margin-bottom:24px;}
.filter-block:last-child{margin-bottom:0;}
.filter-block h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;color:var(--text-soft);margin-bottom:12px;font-family:var(--font-mono);font-weight:600;}
.filter-check{display:flex;align-items:center;gap:9px;padding:7px 0;font-size:.9rem;color:var(--text);cursor:pointer;}
.filter-check input{width:16px;height:16px;accent-color:var(--navy-800);flex-shrink:0;}
#clear-filters{width:100%;margin-top:6px;}

.filter-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px;flex-wrap:wrap;}
.filter-toolbar .search-box{margin:0;max-width:340px;flex:1;}
.sort-select{padding:10px 14px;border-radius:var(--radius-sm);border:1.5px solid var(--border);background:var(--surface);color:var(--text);font-weight:600;font-size:.85rem;}
.jenjang-chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px;}

.pagination{display:flex;gap:6px;justify-content:center;margin-top:36px;}
.page-btn{
  width:38px;height:38px;border-radius:8px;border:1px solid var(--border);background:var(--surface);
  color:var(--text-muted);font-weight:700;font-size:.85rem;
}
.page-btn:hover:not(:disabled){border-color:var(--navy-800);color:var(--navy-800);}
.page-btn.active{background:var(--navy-800);color:#fff;border-color:var(--navy-800);}
.page-btn:disabled{opacity:.4;cursor:not-allowed;}

/* ---------- Detail buku ---------- */
.detail-grid{display:grid;grid-template-columns:300px 1fr;gap:44px;padding:44px 0;}
.detail-cover{
  aspect-ratio:3/4;border-radius:var(--radius-lg);display:flex;align-items:flex-end;padding:22px;
  color:#fff;position:relative;box-shadow:var(--shadow-lg);
}
.detail-cover .cover-title{font-family:var(--font-display);font-size:1.3rem;font-weight:700;}
.detail-actions{display:flex;flex-direction:column;gap:10px;margin-top:18px;}
.detail-actions .btn{gap:8px;}
.js-detail-fav.active{color:var(--red);}
.detail-info .eyebrow{display:block;margin-bottom:10px;}
.detail-info h1{font-size:clamp(1.6rem,2.6vw,2.2rem);}
.detail-author{font-size:.95rem;}
.detail-stats{display:flex;gap:28px;flex-wrap:wrap;padding:20px 0;margin:14px 0 22px;border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.detail-stats div{display:flex;flex-direction:column;gap:3px;}
.detail-stats strong{font-family:var(--font-display);font-size:1.2rem;color:var(--navy-900);display:flex;align-items:center;gap:5px;}
[data-theme="dark"] .detail-stats strong{color:#fff;}
.detail-stats strong svg{width:16px;height:16px;color:var(--gold);}
.detail-stats span{font-size:.76rem;color:var(--text-soft);}
.detail-facts{border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;}
.detail-facts li{display:flex;justify-content:space-between;padding:12px 16px;font-size:.88rem;border-bottom:1px solid var(--border);}
.detail-facts li:last-child{border-bottom:none;}
.detail-facts span{color:var(--text-soft);}

/* ---------- Profil ---------- */
.profile-header{display:flex;align-items:center;gap:20px;padding:44px 0 28px;flex-wrap:wrap;}
.profile-avatar-lg{
  width:84px;height:84px;border-radius:50%;background:var(--navy-800);color:#fff;
  display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:2rem;flex-shrink:0;
}
.profile-role-badge{display:inline-block;background:var(--surface-alt);color:var(--navy-800);font-size:.72rem;font-weight:700;padding:4px 10px;border-radius:999px;margin-top:6px;font-family:var(--font-mono);}
[data-theme="dark"] .profile-role-badge{color:var(--gold);}

.profile-tabs{display:flex;gap:6px;border-bottom:1px solid var(--border);margin-bottom:30px;overflow-x:auto;}
.profile-tab-btn{
  padding:12px 18px;font-weight:700;font-size:.88rem;color:var(--text-muted);border-bottom:2px solid transparent;
  white-space:nowrap;background:none;border-top:none;border-left:none;border-right:none;
}
.profile-tab-btn.active{color:var(--navy-800);border-bottom-color:var(--navy-800);}
[data-theme="dark"] .profile-tab-btn.active{color:#fff;border-bottom-color:var(--gold);}

.profile-panel{display:none;}
.profile-panel.active{display:block;}

.settings-card{max-width:480px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:26px;}

.history-item{display:flex;align-items:center;gap:14px;padding:14px;border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:12px;background:var(--surface);}
.history-thumb{width:44px;height:56px;border-radius:6px;flex-shrink:0;}
.history-body{flex:1;display:flex;flex-direction:column;gap:2px;}
.history-body strong{font-size:.92rem;}
.history-body span{font-size:.78rem;color:var(--text-soft);}

.danger-zone{margin-top:20px;padding-top:20px;border-top:1px solid var(--border);}