/* =============================================
   DELIPE EBOOKS — Design System (Pure CSS)
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* --- Tokens --- */
:root {
  --font-display: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.18);
  --transition: .2s cubic-bezier(.4,0,.2,1);
  --container: min(1240px, calc(100vw - 2rem));
}

/* Dark (default) */
html, [data-theme="dark"] {
  --bg-0: #060a14;
  --bg-1: #0c1222;
  --bg-2: #111827;
  --bg-3: #1e293b;
  --text-1: #f1f5f9;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --accent: #2563eb;
  --accent-h: #3b82f6;
  --accent-glow: rgba(37,99,235,.2);
  --border: rgba(255,255,255,.07);
  --border-h: rgba(255,255,255,.13);
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
  --card-bg: rgba(12,18,34,.6);
  --input-bg: rgba(255,255,255,.04);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg-0: #f8fafc;
  --bg-1: #ffffff;
  --bg-2: #f1f5f9;
  --bg-3: #e2e8f0;
  --text-1: #0f172a;
  --text-2: #475569;
  --text-3: #64748b;
  --accent: #1d4ed8;
  --accent-h: #2563eb;
  --accent-glow: rgba(29,78,216,.15);
  --border: rgba(0,0,0,.07);
  --border-h: rgba(0,0,0,.12);
  --card-bg: rgba(255,255,255,.85);
  --input-bg: rgba(0,0,0,.03);
  color-scheme: light;
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;touch-action:manipulation}
body{font-family:var(--font-body);font-size:15px;line-height:1.7;color:var(--text-1);background:var(--bg-0);min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased;overscroll-behavior:none}
img,video,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit;border:none;background:none;outline:none}
button{cursor:pointer}
ul,ol{list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--radius-sm)}
::selection{background:var(--accent);color:#fff}

/* Scrollbar */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg-1)}
::-webkit-scrollbar-thumb{background:var(--bg-3);border-radius:3px}

/* --- Typography --- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.2;color:var(--text-1)}
h1{font-size:clamp(2rem,5vw,3.2rem);letter-spacing:-.02em}
h2{font-size:clamp(1.5rem,3.5vw,2.2rem);letter-spacing:-.015em}
h3{font-size:clamp(1.15rem,2.5vw,1.5rem)}
h4{font-size:1.05rem}
.section-subtitle{color:var(--text-3);font-size:.95rem;margin-top:.4rem}
.text-muted{color:var(--text-3)}
.text-accent{color:var(--accent)}

/* --- Layout --- */
.container{width:var(--container);margin:0 auto}
.section{padding:5rem 0}
.section-alt{background:var(--bg-1)}
.hidden{display:none!important}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem}
@media(max-width:1024px){.section{padding:3.8rem 0}}

/* --- Buttons --- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.7rem 1.6rem;border-radius:var(--radius-md);font-family:var(--font-display);font-weight:600;font-size:.85rem;letter-spacing:.03em;text-transform:uppercase;transition:all var(--transition);white-space:nowrap;position:relative}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 0 0 0 var(--accent-glow)}
.btn-primary:hover{background:var(--accent-h);box-shadow:0 0 20px 2px var(--accent-glow);transform:translateY(-1px)}
.btn-outline{border:1.5px solid var(--border-h);color:var(--text-2)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent)}
.btn-ghost{color:var(--text-2);padding:.5rem 1rem}
.btn-ghost:hover{color:var(--text-1);background:var(--input-bg)}
.btn-sm{padding:.5rem 1.1rem;font-size:.75rem}
.btn-lg{padding:.85rem 2rem;font-size:.9rem}
.btn-block{width:100%}
.btn:disabled{opacity:.5;pointer-events:none}

/* --- Cards --- */
.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;backdrop-filter:blur(12px);transition:all var(--transition)}
.card:hover{border-color:var(--border-h);transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card-featured{border-color:var(--border);box-shadow:none}
.card-featured:hover{box-shadow:var(--shadow-md)}
.card-cover{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:var(--radius-md);background:var(--bg-2)}
.card-body{margin-top:1rem}
.card-title{font-family:var(--font-display);font-size:1.1rem;font-weight:600}
.card-desc{font-size:.85rem;color:var(--text-3);margin-top:.35rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-footer{margin-top:1rem;display:flex;align-items:center;justify-content:space-between;gap:.75rem}
.card-price{font-family:var(--font-display);font-size:1.25rem;font-weight:700;color:var(--accent)}

/* --- Badges --- */
.badge{display:inline-flex;align-items:center;padding:.3rem .8rem;border-radius:var(--radius-full);font-size:.7rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;border:1px solid var(--border)}
.badge-category{background:var(--input-bg);color:var(--text-2)}
.badge-featured{background:var(--accent-glow);color:var(--accent);border-color:var(--border-h)}
.badge-success{background:rgba(34,197,94,.12);color:var(--success)}
.badge-error{background:rgba(239,68,68,.12);color:var(--error)}
.badge-inline{margin-left:.4rem}

/* --- Forms --- */
.form-group{margin-bottom:1rem}
.form-label{display:block;font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-3);margin-bottom:.4rem}
.form-input,.form-textarea{width:100%;padding:.7rem 1rem;background:var(--input-bg);border:1.5px solid var(--border);border-radius:var(--radius-md);font-size:.9rem;color:var(--text-1);transition:border-color var(--transition),box-shadow var(--transition)}
.form-input:focus,.form-textarea:focus{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-glow)}
.form-input:focus-visible,.form-textarea:focus-visible{outline:none}
.form-textarea{resize:vertical;min-height:80px}
.form-input::placeholder,.form-textarea::placeholder{color:var(--text-3)}
.form-check{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--text-2);cursor:pointer}
.form-check input[type="checkbox"]{width:18px;height:18px;accent-color:var(--accent)}
.form-message{font-size:.82rem;margin-top:.5rem;min-height:1.4em}
.form-message.success{color:var(--success)}
.form-message.error{color:var(--error)}
.form-message.warning{color:var(--warning)}
.form-message.info{color:var(--info)}

/* --- Header --- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(6,10,20,.85);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
[data-theme="light"] .site-header{background:rgba(255,255,255,.9)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.header-brand{display:flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-size:1.2rem;font-weight:700;text-decoration:none}
.header-brand img,.header-brand svg{width:28px;height:28px;flex-shrink:0}
.brand-accent{color:var(--accent)}
.header-nav{display:flex;gap:.25rem}
.nav-link{padding:.45rem 1rem;border-radius:var(--radius-md);font-size:.82rem;font-weight:500;color:var(--text-2);transition:all var(--transition)}
.nav-link:hover,.nav-link.active{color:var(--text-1);background:var(--input-bg)}
.header-actions{display:flex;align-items:center;gap:.75rem}
.btn-icon{width:38px;height:38px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);transition:all var(--transition);font-size:1.1rem}
.btn-icon:hover{background:var(--input-bg)}
.theme-icon-light,.theme-icon-dark{display:none}
[data-theme="dark"] .theme-icon-dark{display:inline}
[data-theme="light"] .theme-icon-light{display:inline}

/* User menu */
.user-menu{position:relative}
.user-trigger{display:flex;align-items:center;gap:.5rem;padding:.35rem .6rem .35rem .35rem;border-radius:var(--radius-md);transition:background var(--transition)}
.user-trigger:hover{background:var(--input-bg)}
.user-avatar{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700}
.user-name{font-size:.82rem;font-weight:500;color:var(--text-2)}
.dropdown-panel{position:absolute;top:calc(100% + 8px);right:0;min-width:180px;background:var(--bg-2);border:1px solid var(--border);border-radius:var(--radius-md);padding:.4rem;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(-6px);transition:all var(--transition)}
.dropdown-panel.open{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown-item{display:block;width:100%;padding:.55rem .8rem;border-radius:var(--radius-sm);font-size:.82rem;color:var(--text-2);text-align:left;transition:all var(--transition)}
.dropdown-item:hover{background:var(--input-bg);color:var(--text-1)}

/* Mobile toggle */
.mobile-toggle{display:none;flex-direction:column;gap:5px;width:28px;padding:4px 0}
.mobile-toggle span{display:block;height:2px;background:var(--text-2);border-radius:2px;transition:all var(--transition)}
@media(max-width:768px){
  .mobile-toggle{display:flex}
  .header-nav{position:fixed;top:64px;left:0;right:0;background:var(--bg-1);border-bottom:1px solid var(--border);flex-direction:column;padding:1rem;transform:translateY(-100%);opacity:0;pointer-events:none;transition:all .3s ease}
  .header-nav.open{transform:translateY(0);opacity:1;pointer-events:all}
  .nav-link{padding:.75rem 1rem}
  .user-name{display:none}
}

/* --- Hero --- */
.hero{position:relative;padding:8rem 0 5rem;overflow:hidden}
.hero-content{position:relative;z-index:2;max-width:680px}
.hero h1{margin-top:1rem}
.hero p{color:var(--text-2);font-size:1.05rem;margin-top:1rem;max-width:520px}
.hero-actions{display:flex;gap:1rem;margin-top:2rem;flex-wrap:wrap}
.hero-decoration{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-decoration::before{content:'';position:absolute;width:500px;height:500px;border-radius:50%;background:radial-gradient(circle,var(--accent-glow),transparent 70%);top:-120px;right:-80px;opacity:.5}
.hero-decoration::after{content:'';position:absolute;width:350px;height:350px;border-radius:50%;background:radial-gradient(circle,rgba(212,168,83,.1),transparent 70%);bottom:-80px;left:10%;opacity:.6}

/* --- Catalog --- */
.catalog-toolbar{display:flex;gap:1rem;flex-wrap:wrap;align-items:center;margin-bottom:2rem}
.catalog-page .container{width:min(1600px,95vw)}
.catalog-toolbar .form-input{max-width:360px;flex:1}
.filter-chips{display:flex;gap:.5rem;flex-wrap:wrap}
.chip{padding:.4rem .9rem;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;border:1px solid var(--border);color:var(--text-3);cursor:pointer;transition:all var(--transition)}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.catalog-grid{display:grid;grid-template-columns:1fr;gap:1.3rem;align-items:stretch;justify-items:stretch}
.catalog-card{cursor:pointer;display:flex;flex-direction:column;height:100%}
.catalog-card:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.catalog-card .card-cover{aspect-ratio:16/10}
.catalog-card .card-body{display:flex;flex-direction:column;flex:1}
.catalog-card .card-desc{margin-top:.42rem;min-height:3.5em}
.catalog-card .card-footer{margin-top:auto;align-items:center;justify-content:space-between}
.catalog-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.58rem;margin-top:.88rem}
.catalog-card .share-btn,.catalog-card .catalog-more-btn{display:inline-flex;align-items:center;justify-content:center;width:100%;min-height:42px;min-width:0;margin:0;padding:.58rem .78rem;border-radius:var(--radius-md);border:1px solid #1d4ed8;background:linear-gradient(180deg,#2563eb 0%,#1d4ed8 100%);box-shadow:0 8px 16px rgba(37,99,235,.28),inset 0 1px 0 rgba(255,255,255,.22);color:#fff;font-size:.73rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;transition:all var(--transition)}
.catalog-card .share-btn{gap:.35rem}
.catalog-card .share-btn svg{width:13px;height:13px}
.catalog-card .share-btn:hover,.catalog-card .catalog-more-btn:hover{border-color:#2563eb;background:linear-gradient(180deg,#3b82f6 0%,#2563eb 100%);box-shadow:0 10px 18px rgba(37,99,235,.34),inset 0 1px 0 rgba(255,255,255,.24);color:#fff;transform:translateY(-1px)}
.catalog-card .share-btn:active,.catalog-card .catalog-more-btn:active{transform:translateY(0);box-shadow:0 6px 12px rgba(37,99,235,.26),inset 0 1px 0 rgba(255,255,255,.2)}
@media(min-width:680px){
  .catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media(min-width:1024px){
  .catalog-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
}
@media(min-width:1280px){
  .catalog-grid{grid-template-columns:repeat(4,minmax(0,1fr));}
}
@media(max-width:640px){
  .catalog-grid{grid-template-columns:1fr;gap:1rem}
  .catalog-grid .card{padding:.95rem}
  .catalog-grid .card-cover{aspect-ratio:4/3}
  .catalog-grid .card-title{font-size:1rem}
  .catalog-grid .card-desc{font-size:.82rem;-webkit-line-clamp:2}
  .catalog-grid .card-price{font-size:1.08rem}
  .catalog-grid .card-footer{flex-direction:row;align-items:center;gap:.55rem}
  .catalog-card .share-btn,.catalog-card .catalog-more-btn{font-size:.69rem;padding:.54rem .55rem;letter-spacing:.02em}
}
.empty-state{text-align:center;padding:4rem 2rem}
.empty-state h3{color:var(--text-2)}
.empty-state p{color:var(--text-3);margin-top:.5rem}

/* --- Ebook Page --- */
.ebook-page{min-height:calc(100vh - 64px);background:
  radial-gradient(940px 440px at 98% 0%,rgba(37,99,235,.16),transparent 62%),
  radial-gradient(760px 360px at 0% 100%,rgba(56,189,248,.08),transparent 58%),
  var(--bg-0)}
.ebook-hero{padding-top:3.5rem;padding-bottom:2.8rem;background:linear-gradient(180deg,rgba(12,18,34,.72),transparent)}
.ebook-hero-grid{display:grid;grid-template-columns:minmax(260px,340px) minmax(0,1fr);gap:2.2rem;align-items:start}
.ebook-cover-shell{position:relative;padding:.75rem;border-radius:24px;background:linear-gradient(160deg,rgba(37,99,235,.25),rgba(15,23,42,.28));border:1px solid var(--border-h);box-shadow:0 18px 44px rgba(2,6,23,.5)}
.ebook-cover{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:18px;background:var(--bg-2)}
.ebook-hero-copy{display:grid;gap:.9rem}
.ebook-short-description{font-size:.98rem;line-height:1.85;color:var(--text-2);max-width:64ch}
.ebook-highlights{display:flex;flex-wrap:wrap;gap:.55rem}
.ebook-highlights li{padding:.35rem .75rem;border-radius:var(--radius-full);border:1px solid var(--border);background:rgba(37,99,235,.1);font-size:.72rem;letter-spacing:.02em;color:var(--text-2)}
.ebook-price-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding:.95rem 1rem;border:1px solid var(--border);border-radius:var(--radius-md);background:rgba(15,23,42,.38)}
.ebook-price{font-family:var(--font-display);font-size:2rem;font-weight:800;letter-spacing:-.02em;color:var(--accent)}
.ebook-hero-actions{display:flex;align-items:center;gap:.65rem;flex-wrap:wrap}
.ebook-hero-actions .share-btn{border:1px solid #1d4ed8;background:#1d4ed8;color:#fff;font-weight:700;letter-spacing:.03em;text-transform:uppercase}
.ebook-hero-actions .share-btn:hover{border-color:#1e40af;background:#1e40af;color:#fff}
.ebook-content-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:1.4rem;align-items:start}
.ebook-main-card{padding:1.8rem}
.ebook-sidebar-card{position:sticky;top:92px;padding:1.3rem}
.ebook-sidebar-summary{color:var(--text-2);font-size:.9rem;line-height:1.75}
.ebook-description{color:var(--text-2);font-size:.95rem;line-height:1.9}
.ebook-benefits{display:grid;gap:.65rem}
@media(max-width:980px){
  .ebook-hero-grid{grid-template-columns:1fr;gap:1.4rem}
  .ebook-cover-shell{max-width:360px}
  .ebook-content-grid{grid-template-columns:1fr}
  .ebook-sidebar-card{position:static}
}

/* --- Steps --- */
.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem;margin-top:2rem}
.step-number{font-family:var(--font-display);font-size:2.5rem;font-weight:700;color:var(--accent);opacity:.3;line-height:1}
.step-card h3{margin-top:.5rem}
.step-card p{color:var(--text-3);font-size:.88rem;margin-top:.4rem}

/* --- Auth Page --- */
.auth-page{min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;padding:2.2rem 1rem 3rem;background:
  radial-gradient(760px 330px at 50% 0%,rgba(37,99,235,.2),transparent 72%),
  linear-gradient(180deg,var(--bg-0),var(--bg-1))}
.auth-layout{width:min(680px,calc(100vw - 1rem));border-radius:22px;border:1px solid var(--border);background:rgba(12,18,34,.8);box-shadow:0 24px 48px rgba(2,6,23,.42);backdrop-filter:blur(14px)}
.auth-forms{padding:2rem}
.auth-header{display:grid;gap:.35rem;justify-items:center;text-align:center;margin-bottom:1.2rem}
.auth-title{font-size:clamp(1.15rem,2.2vw,1.42rem);font-weight:800;letter-spacing:.01em}
.auth-subtitle{font-size:.92rem;color:var(--text-2)}
#loginMethods{display:grid;gap:.78rem}
.auth-provider-btn{display:flex;align-items:center;justify-content:center;gap:.66rem;width:100%;min-height:54px;padding:.9rem 1.05rem;border-radius:var(--radius-md);border:1.5px solid var(--border-h);font-size:.95rem;font-weight:600;color:var(--text-1);background:linear-gradient(180deg,rgba(255,255,255,.025),rgba(255,255,255,.012));box-shadow:inset 0 1px 0 rgba(255,255,255,.03);transition:all var(--transition);text-align:center}
.auth-provider-btn:hover{border-color:var(--accent);background:var(--accent-glow)}
.auth-provider-btn:disabled{opacity:.65;cursor:not-allowed}
.auth-provider-icon{width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;color:#dbeafe}
.auth-provider-btn svg,.auth-provider-icon svg{width:20px!important;height:20px!important;max-width:none!important;flex:0 0 20px}
.auth-provider-label{line-height:1.2;font-size:.92rem}
.google-mask-shell{position:relative;width:100%}
.google-mask-shell .auth-provider-btn{position:relative;z-index:1}
.google-login-mask{position:absolute;inset:0;z-index:3;border-radius:var(--radius-md);overflow:hidden;opacity:0}
.google-login-mask>div{display:block!important;width:100%!important;height:100%!important}
.google-login-mask iframe{width:100%!important;min-width:100%!important;height:100%!important}
#identityFlow{display:grid;gap:.85rem;max-width:560px;width:100%;margin:0 auto}
.auth-step{display:grid;gap:.48rem;padding:.15rem 0 .2rem;border:none;border-radius:0;background:transparent;box-shadow:none;animation:none}
.auth-step-title{display:flex;align-items:center;gap:.35rem;font-size:1rem;font-weight:700;letter-spacing:-.01em}
.auth-step-title::before{display:none}
.auth-step-subtitle{font-size:.84rem;color:var(--text-2);margin-bottom:.25rem}
#identityStepEmail .auth-step-title,#identityStepEmail .auth-step-subtitle{display:none}
.auth-register-hint{margin-top:.9rem;text-align:center;font-size:.84rem;color:var(--text-2)}
.auth-register-link{color:#bfdbfe;text-decoration:underline;text-underline-offset:2px}
.auth-register-link:hover{color:#fff}
#verifyForm,#forgotForm,#resetForm{padding:.95rem;border:1px solid var(--border);border-radius:calc(var(--radius-md) + 2px);background:linear-gradient(160deg,rgba(15,23,42,.52),rgba(15,23,42,.28));box-shadow:inset 0 1px 0 rgba(255,255,255,.03)}
.input-handle{display:flex;align-items:center;border:1.5px solid var(--border);border-radius:var(--radius-md);background:var(--input-bg);overflow:hidden;transition:border-color var(--transition),box-shadow var(--transition)}
.input-handle:focus-within{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-glow)}
.input-handle-prefix{padding:0 .85rem;font-weight:700;color:var(--text-2)}
.input-handle .form-input{border:none;background:transparent;box-shadow:none;padding-left:.2rem}
.input-handle .form-input:focus{box-shadow:none}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;margin-bottom:1.5rem}
.tab{padding:.6rem;border-radius:var(--radius-md);font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;border:1px solid var(--border);color:var(--text-3);transition:all var(--transition)}
.tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.auth-message{font-size:.86rem;margin-bottom:.8rem;border-radius:var(--radius-md)}
.auth-message:empty{display:none}
.auth-message.info,.auth-message.success,.auth-message.warning,.auth-message.error{padding:.68rem .8rem;border:1px solid transparent}
.auth-message.info{color:#bfdbfe;background:rgba(59,130,246,.12);border-color:rgba(59,130,246,.32)}
.auth-message.success{color:#86efac;background:rgba(34,197,94,.12);border-color:rgba(34,197,94,.32)}
.auth-message.warning{color:#fde68a;background:rgba(245,158,11,.12);border-color:rgba(245,158,11,.32)}
.auth-message.error{color:#fecaca;background:rgba(239,68,68,.12);border-color:rgba(239,68,68,.32)}
.auth-center-popup,.google-login-modal{position:fixed;inset:0;z-index:450;display:flex;align-items:center;justify-content:center;padding:1rem;background:rgba(2,6,23,.62);backdrop-filter:blur(8px)}
.auth-center-popup-card,.google-login-modal-card{position:relative;width:min(92vw,460px);border-radius:18px;border:1px solid var(--border-h);background:linear-gradient(155deg,rgba(15,23,42,.94),rgba(15,23,42,.82));box-shadow:0 24px 54px rgba(2,6,23,.62);padding:1.2rem 1.15rem 1rem;animation:authModalIn .22s ease-out}
.auth-center-popup-close,.google-login-modal-close{position:absolute;top:.55rem;right:.6rem;width:32px;height:32px;border-radius:50%;border:1px solid var(--border-h);display:flex;align-items:center;justify-content:center;color:var(--text-2);font-size:1.15rem;line-height:1;transition:all var(--transition)}
.auth-center-popup-close:hover,.google-login-modal-close:hover{color:#fff;border-color:var(--accent);background:rgba(37,99,235,.18)}
.auth-center-popup-badge{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:.88rem;font-weight:800;border:1px solid rgba(255,255,255,.24);background:rgba(255,255,255,.08);color:#fff}
.auth-center-popup-title,.google-login-modal-title{margin-top:.4rem;font-size:1.12rem;font-weight:800;letter-spacing:-.01em}
.auth-center-popup-text,.google-login-modal-subtitle{margin-top:.35rem;font-size:.92rem;line-height:1.6;color:var(--text-2)}
.auth-center-popup[data-type="info"] .auth-center-popup-card{border-color:rgba(59,130,246,.45)}
.auth-center-popup[data-type="success"] .auth-center-popup-card{border-color:rgba(34,197,94,.45)}
.auth-center-popup[data-type="warning"] .auth-center-popup-card{border-color:rgba(245,158,11,.45)}
.auth-center-popup[data-type="error"] .auth-center-popup-card{border-color:rgba(239,68,68,.5)}
.google-login-modal-title{margin-top:.2rem}
.google-login-modal-button{margin-top:.9rem;display:flex;justify-content:center;width:100%}
.google-login-modal-button>div{width:100%;display:flex;justify-content:center}
.google-login-modal-help{margin-top:.62rem;font-size:.8rem;color:var(--text-3);text-align:center}
#authMessage.auth-message{display:none!important}
.auth-divider{display:flex;align-items:center;gap:1rem;margin:1.25rem 0;color:var(--text-3);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em}
.auth-divider::before,.auth-divider::after{content:'';flex:1;height:1px;background:var(--border)}
.btn-google{display:flex;align-items:center;justify-content:center;gap:.6rem;width:100%;padding:.7rem 1rem;border-radius:var(--radius-md);border:1.5px solid var(--border-h);font-size:.85rem;font-weight:500;color:var(--text-1);background:var(--input-bg);transition:all var(--transition)}
.btn-google:hover{border-color:var(--accent);background:var(--accent-glow)}
.btn-google svg{width:18px;height:18px;flex-shrink:0}
.share-btn{display:inline-flex;align-items:center;gap:.4rem;padding:.45rem .9rem;border-radius:var(--radius-md);font-size:.75rem;font-weight:500;color:var(--text-3);border:1px solid var(--border);background:transparent;cursor:pointer;transition:all var(--transition)}
.share-btn:hover{color:var(--accent);border-color:var(--accent)}
.share-btn svg{width:14px;height:14px}
[data-theme="light"] .auth-page{background:
  radial-gradient(760px 330px at 50% 0%,rgba(29,78,216,.1),transparent 72%),
  linear-gradient(180deg,#eef2ff,#f8fafc)}
[data-theme="light"] .auth-layout{background:rgba(255,255,255,.96);box-shadow:0 16px 32px rgba(15,23,42,.12);border-color:rgba(15,23,42,.12)}
[data-theme="light"] .tab{background:#fff;border-color:rgba(15,23,42,.16);color:#475569}
[data-theme="light"] .btn-google{background:#fff;border-color:rgba(15,23,42,.16);color:#0f172a}
[data-theme="light"] .btn-outline{border-color:rgba(15,23,42,.22);color:#334155;background:#fff}
[data-theme="light"] .btn-outline:hover{border-color:#1d4ed8;color:#1d4ed8;background:rgba(29,78,216,.06)}
[data-theme="light"] .btn-ghost{color:#334155}
[data-theme="light"] .btn-ghost:hover{color:#0f172a;background:rgba(15,23,42,.06)}
[data-theme="light"] .auth-provider-btn{background:#fff;border-color:rgba(15,23,42,.16);color:#0f172a}
[data-theme="light"] .auth-provider-icon{color:#1d4ed8}
[data-theme="light"] .auth-subtitle{color:#475569}
[data-theme="light"] .auth-register-link{color:#1d4ed8}
[data-theme="light"] .chip{border-color:rgba(15,23,42,.18);color:#475569;background:#fff}
[data-theme="light"] .chip.active{background:#1d4ed8;border-color:#1d4ed8;color:#fff}
[data-theme="light"] .auth-step{background:transparent;border-color:transparent;box-shadow:none}
[data-theme="light"] .input-handle{background:#fff;border-color:rgba(15,23,42,.16)}
[data-theme="light"] .auth-message.info{color:#1e3a8a;background:#dbeafe;border-color:#93c5fd}
[data-theme="light"] .auth-message.success{color:#14532d;background:#dcfce7;border-color:#86efac}
[data-theme="light"] .auth-message.warning{color:#92400e;background:#fef3c7;border-color:#fbbf24}
[data-theme="light"] .auth-message.error{color:#991b1b;background:#fee2e2;border-color:#fca5a5}
[data-theme="light"] .auth-message.warning,[data-theme="light"] .auth-message.error{font-weight:600}
[data-theme="light"] .auth-center-popup,[data-theme="light"] .google-login-modal{background:rgba(15,23,42,.38)}
[data-theme="light"] .auth-center-popup-card,[data-theme="light"] .google-login-modal-card{background:linear-gradient(155deg,#ffffff,#f8fafc);border-color:rgba(15,23,42,.16);box-shadow:0 18px 40px rgba(15,23,42,.2)}
[data-theme="light"] .auth-center-popup-title,[data-theme="light"] .google-login-modal-title{color:#0f172a}
[data-theme="light"] .auth-center-popup-text,[data-theme="light"] .google-login-modal-subtitle{color:#334155}
[data-theme="light"] .auth-center-popup-badge{background:#e2e8f0;color:#0f172a;border-color:rgba(15,23,42,.15)}
[data-theme="light"] .google-login-modal-help{color:#64748b}
[data-theme="light"] .form-message.info{color:#1e40af}
[data-theme="light"] .form-message.success{color:#166534}
[data-theme="light"] .form-message.warning{color:#92400e}
[data-theme="light"] .form-message.error{color:#b91c1c}
[data-theme="light"] .ebook-page{background:
  radial-gradient(960px 460px at 100% 0%,rgba(59,130,246,.12),transparent 64%),
  radial-gradient(760px 380px at 0% 100%,rgba(14,165,233,.08),transparent 62%),
  #f8fafc}
[data-theme="light"] .ebook-hero{background:linear-gradient(180deg,rgba(255,255,255,.86),transparent)}
[data-theme="light"] .ebook-cover-shell{background:linear-gradient(160deg,rgba(59,130,246,.2),rgba(148,163,184,.18));border-color:rgba(30,64,175,.24);box-shadow:0 16px 34px rgba(15,23,42,.16)}
[data-theme="light"] .ebook-short-description,[data-theme="light"] .ebook-sidebar-summary,[data-theme="light"] .ebook-description{color:#334155}
[data-theme="light"] .ebook-highlights li{background:#dbeafe;border-color:#93c5fd;color:#1e3a8a}
[data-theme="light"] .ebook-price-row{background:#e2e8f0;border-color:rgba(30,41,59,.18)}
[data-theme="light"] .ebook-hero-actions .share-btn{border-color:#1d4ed8;background:#1d4ed8;color:#fff}
[data-theme="light"] .ebook-hero-actions .share-btn:hover{border-color:#1e40af;background:#1e40af;color:#fff}
[data-theme="light"] .catalog-card .share-btn,[data-theme="light"] .catalog-card .catalog-more-btn{border-color:#1d4ed8;background:linear-gradient(180deg,#2563eb 0%,#1d4ed8 100%);box-shadow:0 8px 16px rgba(29,78,216,.25),inset 0 1px 0 rgba(255,255,255,.2);color:#fff}
[data-theme="light"] .catalog-card .share-btn:hover,[data-theme="light"] .catalog-card .catalog-more-btn:hover{border-color:#1e40af;background:linear-gradient(180deg,#3b82f6 0%,#1e40af 100%);box-shadow:0 10px 18px rgba(29,78,216,.32),inset 0 1px 0 rgba(255,255,255,.22);color:#fff}
@media(max-width:768px){
  .auth-page{padding:1.2rem .75rem 2rem}
  .auth-layout{width:min(640px,100%)}
  .auth-forms{padding:1.2rem}
}
@media(max-width:480px){
  .auth-layout{border-radius:16px}
  .auth-provider-btn{min-height:50px;font-size:.9rem}
}

/* --- Admin --- */
.admin-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:1.5rem;margin-top:2rem}
.admin-item{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1rem;border-radius:var(--radius-md);border:1px solid var(--border);transition:background var(--transition)}
.admin-item:hover{background:var(--input-bg)}
.admin-item-title{font-weight:600;font-size:.9rem}
.admin-item-cat{font-size:.72rem;color:var(--text-3);text-transform:uppercase;letter-spacing:.05em}
.admin-actions{display:flex;gap:.4rem}
@media(max-width:768px){.admin-grid{grid-template-columns:1fr}}

/* --- Modal --- */
.modal-overlay{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;background:rgba(6,10,20,.75);backdrop-filter:blur(6px);padding:clamp(.75rem,2vw,1.4rem);overflow:auto;opacity:0;visibility:hidden;transition:all .25s ease}
.modal-overlay.open{opacity:1;visibility:visible}
.modal-panel{background:var(--bg-1);border:1px solid var(--border);border-radius:var(--radius-lg);max-width:min(900px,100%);width:100%;max-height:min(88vh,820px);overflow-y:auto;margin:auto;transform:scale(.96) translateY(10px);transition:transform .25s ease}
.modal-overlay.open .modal-panel{transform:scale(1) translateY(0)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border)}
.modal-body{padding:1.5rem}
.modal-grid{display:grid;grid-template-columns:260px 1fr;gap:1.5rem}
.modal-cover{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:var(--radius-md);background:var(--bg-2)}
.modal-tabs{display:grid;grid-template-columns:1fr 1fr;gap:.4rem;margin:1rem 0}
.modal-tab{padding:.5rem;border-radius:var(--radius-sm);font-size:.78rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;border:1px solid var(--border);color:var(--text-3);transition:all var(--transition)}
.modal-tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.benefits-list{display:grid;gap:.5rem;margin-top:1rem}
.benefit-item{padding:.55rem .85rem;border-radius:var(--radius-sm);border:1px solid var(--border);font-size:.85rem;color:var(--text-2);background:var(--input-bg)}
.modal-price{font-family:var(--font-display);font-size:1.8rem;font-weight:700;color:var(--accent)}
.modal-cta{display:flex;align-items:center;gap:1rem;margin-top:1.5rem;flex-wrap:wrap}
.comment-card{padding:.85rem;border-radius:var(--radius-md);border:1px solid var(--border);margin-top:.6rem}
.comment-author{font-weight:600;font-size:.82rem}
.comment-date{font-size:.7rem;color:var(--text-3)}
.comment-body{font-size:.85rem;color:var(--text-2);margin-top:.3rem}
@media(max-width:768px){.modal-grid{grid-template-columns:1fr}}

/* --- Footer --- */
.site-footer{border-top:1px solid var(--border);margin-top:5rem}
.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;padding:2rem 0}
.footer-brand{font-family:var(--font-display);font-weight:700;font-size:1.05rem}
.footer-tagline{font-size:.78rem;color:var(--text-3);margin-top:.2rem}
.footer-links{display:flex;gap:1.5rem}
.footer-links a{font-size:.82rem;color:var(--text-3);transition:color var(--transition)}
.footer-links a:hover{color:var(--text-1)}
.footer-copy{font-size:.72rem;color:var(--text-3)}
@media(max-width:640px){.footer-inner{flex-direction:column;text-align:center}}

/* --- Toast --- */
.toast-container{position:fixed;top:80px;right:1rem;z-index:300;display:flex;flex-direction:column;gap:.5rem;pointer-events:none}
.toast{pointer-events:all;padding:.8rem 1.2rem;border-radius:var(--radius-md);font-size:.84rem;font-weight:500;background:var(--bg-2);border:1px solid var(--border);color:var(--text-1);box-shadow:var(--shadow-lg);animation:toastIn .3s ease forwards;max-width:380px}
.toast.success{border-color:var(--success);background:rgba(34,197,94,.1)}
.toast.error{border-color:var(--error);background:rgba(239,68,68,.1)}
.toast.warning{border-color:var(--warning);background:rgba(245,158,11,.1)}
.toast.info{border-color:var(--info);background:rgba(59,130,246,.1)}
.toast.removing{animation:toastOut .25s ease forwards}

/* --- Animations --- */
@keyframes toastIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}
@keyframes toastOut{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(20px)}}
@keyframes authModalIn{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}
.animate-in{opacity:0;transform:translateY(20px);transition:opacity .5s ease,transform .5s ease}
.animate-in.visible{opacity:1;transform:translateY(0)}
.skeleton{background:linear-gradient(90deg,var(--bg-2) 25%,var(--bg-3) 50%,var(--bg-2) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}

/* --- Utilities --- */
.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.5rem}.mt-4{margin-top:2rem}
.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}
.gap-1{gap:.5rem}.gap-2{gap:1rem}
.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.flex-wrap{flex-wrap:wrap}
.w-full{width:100%}
.text-center{text-align:center}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* Body offset for fixed header */
body{padding-top:64px}

/* =============================================
   LANDING PAGE — Clean Minimal
   ============================================= */

.landing-body{overflow:hidden;height:100vh;height:100dvh}

.landing{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  height:calc(100vh - 64px);
  height:calc(100dvh - 64px);
  overflow:hidden;
  background:var(--bg-0);
}

/* Ambient glow — single subtle radial */
.landing-ambient{
  position:absolute;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse 55% 50% at 50% 40%,rgba(37,99,235,.08),transparent 70%);
}
[data-theme="light"] .landing-ambient{
  background:radial-gradient(ellipse 55% 50% at 50% 40%,rgba(29,78,216,.06),transparent 70%);
}

/* Noise texture */
.landing-noise{
  position:absolute;inset:0;pointer-events:none;z-index:1;opacity:.3;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.04'/%3E%3C/svg%3E");
  background-repeat:repeat;
  background-size:256px 256px;
}

/* Content */
.landing-content{
  position:relative;z-index:5;
  text-align:center;
  max-width:680px;
  width:92vw;
  animation:landingIn .8s ease both;
}
@keyframes landingIn{
  from{opacity:0;transform:translateY(24px)}
  to{opacity:1;transform:translateY(0)}
}

/* Tag pill */
.landing-tag{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.35rem .9rem;
  border-radius:var(--radius-full);
  background:rgba(37,99,235,.08);
  border:1px solid rgba(37,99,235,.15);
  color:var(--accent-h);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.tag-dot{
  width:5px;height:5px;
  border-radius:50%;
  background:var(--accent);
  animation:tagPulse 2.5s ease-in-out infinite;
}
@keyframes tagPulse{
  0%,100%{opacity:.3}
  50%{opacity:1}
}

/* Title */
.landing-title{
  font-family:var(--font-display);
  font-size:clamp(3rem,7.5vw,5.5rem);
  font-weight:800;
  letter-spacing:-.045em;
  line-height:1;
  margin-top:1.6rem;
  color:var(--text-1);
}
.title-accent{
  color:var(--accent);
  font-weight:300;
}

/* Subtitle */
.landing-subtitle{
  font-size:clamp(.9rem,1.4vw,1.05rem);
  color:var(--text-2);
  line-height:1.8;
  max-width:460px;
  margin:1.2rem auto 0;
  font-weight:400;
}
.landing-subtitle strong{
  color:var(--text-1);
  font-weight:600;
}

/* CTA buttons */
.landing-cta{
  display:flex;
  gap:.75rem;
  justify-content:center;
  margin-top:2.2rem;
  flex-wrap:wrap;
}
.cta-primary{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.75rem 1.8rem;
  border-radius:var(--radius-md);
  background:var(--accent);
  color:#fff;
  font-family:var(--font-display);
  font-weight:600;
  font-size:.82rem;
  letter-spacing:.02em;
  transition:all var(--transition);
}
.cta-primary:hover{
  opacity:.85;
  transform:translateY(-1px);
}
.cta-primary svg{transition:transform var(--transition)}
.cta-primary:hover svg{transform:translateX(3px)}

.cta-secondary{
  display:inline-flex;
  align-items:center;
  padding:.75rem 1.8rem;
  border-radius:var(--radius-md);
  border:1px solid var(--border-h);
  color:var(--text-2);
  font-family:var(--font-display);
  font-weight:500;
  font-size:.82rem;
  letter-spacing:.02em;
  transition:all var(--transition);
}
.cta-secondary:hover{
  border-color:var(--text-3);
  color:var(--text-1);
}

/* Bottom info strip */
.landing-strip{
  position:absolute;
  bottom:0;left:0;right:0;
  z-index:6;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:2rem;
  padding:1rem 2rem;
  border-top:1px solid var(--border);
  animation:landingIn .8s .3s ease both;
}
.strip-item{
  display:flex;
  align-items:center;
  gap:.6rem;
  color:var(--text-3);
}
.strip-item svg{
  opacity:.5;
  flex-shrink:0;
}
.strip-value{
  display:block;
  font-size:.78rem;
  font-weight:600;
  color:var(--text-2);
}
.strip-label{
  display:block;
  font-size:.65rem;
  color:var(--text-3);
}
.strip-divider{
  width:1px;
  height:24px;
  background:var(--border);
}

/* --- Responsive --- */
@media(max-width:768px){
  .landing-title{font-size:clamp(2.2rem,10vw,3.5rem)}
  .landing-subtitle{font-size:.88rem}
  .landing-cta{flex-direction:column;align-items:center}
  .cta-primary,.cta-secondary{width:100%;max-width:280px;justify-content:center}
  .landing-strip{gap:1rem;padding:.8rem 1rem}
  .strip-value{font-size:.72rem}
  .strip-label{font-size:.6rem}
}
@media(max-width:480px){
  .strip-divider{display:none}
  .landing-strip{flex-wrap:wrap;justify-content:space-around;gap:.6rem}
}