/* ========================================================================
   VisualReads – Global Styles
   Gemeinsames Stylesheet für index.html + alle Buchseiten.
   Farb- und Typo-DNA:
     - Hintergrund:   #f5f2ec  (warmes Papier)
     - Text:          #0a0a0a  (fast schwarz)
     - Akzent:        #e63000  (rot)
     - Serif:         Fraunces (Stimme, Überschriften, Zitate)
     - Mono:          Geist Mono / Space Mono (Interface, Kleinkram)
   ======================================================================== */

/* --- RESET --- */
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{background:#f5f2ec;color:#0a0a0a;font-family:'Space Mono',monospace;font-size:15px;line-height:1.8;}

/* --- NAV (beide Seiten) --- */
nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 40px;height:56px;background:#f5f2ec;border-bottom:2px solid #0a0a0a;}
.logo{font-family:'Geist Mono',monospace;font-size:16px;font-weight:700;color:#0a0a0a;text-decoration:none;letter-spacing:0.06em;text-transform:uppercase;}
.logo span{color:#e63000;}
.nav-links{display:flex;gap:28px;}
.nav-links a{font-family:'Geist Mono',monospace;font-size:11px;color:#666;text-decoration:none;letter-spacing:0.08em;text-transform:uppercase;transition:color .15s;}
.nav-links a:hover{color:#0a0a0a;}
.nav-tag{font-family:'Geist Mono',monospace;font-size:10px;padding:4px 10px;border:1.5px solid #0a0a0a;color:#0a0a0a;letter-spacing:0.08em;text-transform:uppercase;}
.back{font-family:'Geist Mono',monospace;font-size:11px;color:#666;text-decoration:none;letter-spacing:0.08em;text-transform:uppercase;}
.back:hover{color:#0a0a0a;}

/* --- BUTTONS --- */
.btn-black{font-family:'Geist Mono',monospace;font-size:12px;font-weight:700;padding:13px 22px;background:#0a0a0a;color:#fff;text-decoration:none;letter-spacing:0.08em;text-transform:uppercase;border:2px solid #0a0a0a;transition:all .15s;display:inline-block;}
.btn-black:hover{background:#e63000;border-color:#e63000;}
.btn-outline{font-family:'Geist Mono',monospace;font-size:12px;padding:13px 22px;background:transparent;color:#0a0a0a;text-decoration:none;letter-spacing:0.08em;text-transform:uppercase;border:2px solid #0a0a0a;transition:all .15s;display:inline-block;}
.btn-outline:hover{background:#0a0a0a;color:#fff;}

/* ========================================================================
   INDEX-SEITE
   ======================================================================== */

/* IDEA OF THE DAY STRIP */
.iotd{position:fixed;top:56px;left:0;right:0;z-index:99;background:#0a0a0a;border-bottom:2px solid #0a0a0a;padding:14px 40px;}
.iotd-inner{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:22px;flex-wrap:wrap;}
.iotd-label{font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:0.20em;text-transform:uppercase;color:#e63000;font-weight:600;flex-shrink:0;}
.iotd-text{font-family:'Fraunces',serif;font-size:15px;font-style:italic;color:#fff;flex:1;min-width:220px;line-height:1.4;}
.iotd-text em{font-style:italic;color:#e63000;font-weight:500;}
.iotd-source{font-family:'Geist Mono',monospace;font-size:10px;color:#666;letter-spacing:0.1em;text-transform:uppercase;flex-shrink:0;}
.iotd-link{font-family:'Geist Mono',monospace;font-size:10px;font-weight:700;color:#888;text-decoration:none;letter-spacing:0.1em;text-transform:uppercase;flex-shrink:0;transition:color .15s;}
.iotd-link:hover{color:#e63000;}

/* HERO */
.hero{padding:170px 40px 80px;max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:80px;align-items:center;}
.hero-eyebrow{font-family:'Geist Mono',monospace;font-size:11px;letter-spacing:0.20em;text-transform:uppercase;color:#e63000;font-weight:600;margin-bottom:22px;display:flex;align-items:center;gap:12px;}
.hero-eyebrow::before{content:"";width:40px;height:1.5px;background:#e63000;}
.hero-title{font-family:'Fraunces',serif;font-size:clamp(36px,5.2vw,66px);font-weight:600;line-height:1.02;letter-spacing:-0.02em;margin-bottom:22px;text-wrap:pretty;}
.hero-title em{font-style:italic;color:#e63000;font-weight:500;}
.hero-lead{font-size:16px;color:#333;line-height:1.85;max-width:520px;margin-bottom:32px;text-wrap:pretty;}
.hero-btns{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px;}

/* HERO DEMO: 4 Schichten */
.demo{background:#fff;border:2px solid #0a0a0a;padding:24px;box-shadow:-8px 8px 0 #0a0a0a;}
.demo-label{font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:0.16em;text-transform:uppercase;color:#767676;margin-bottom:14px;}
.demo-label strong{color:#e63000;}
.demo-pills{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;margin-bottom:20px;border:1.5px solid #0a0a0a;}
.demo-pill{font-family:'Geist Mono',monospace;font-size:10px;padding:10px 6px;background:transparent;color:#666;cursor:pointer;letter-spacing:0.06em;text-transform:uppercase;border:none;border-right:1.5px solid #0a0a0a;display:flex;flex-direction:column;align-items:center;gap:3px;transition:all .15s;}
.demo-pill:last-child{border-right:none;}
.demo-pill:hover{background:#f5f2ec;color:#0a0a0a;}
.demo-pill.active{background:#e63000;color:#fff;}
.demo-pill .t{font-size:9px;opacity:.7;font-weight:400;}
.demo-pill.active .t{opacity:1;}
.demo-stage{min-height:140px;padding:12px 4px 4px;}
.demo-content{display:none;animation:fadeIn .25s ease;}
.demo-content.visible{display:block;}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px);}to{opacity:1;transform:translateY(0);}}
.demo-glance{font-family:'Fraunces',serif;font-size:20px;font-style:italic;line-height:1.4;color:#0a0a0a;}
.demo-glance em{color:#e63000;font-style:italic;}
.demo-sub{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:0.12em;text-transform:uppercase;color:#767676;margin-bottom:8px;}
.demo-msg{font-family:'Fraunces',serif;font-size:16px;font-style:italic;line-height:1.45;color:#0a0a0a;border-left:3px solid #e63000;padding-left:14px;margin-bottom:10px;}
.demo-txt{font-size:13px;color:#333;line-height:1.75;}
.demo-example{background:#f5f2ec;border:1.5px solid #0a0a0a;padding:12px 14px;margin-top:10px;}
.demo-example-l{font-family:'Geist Mono',monospace;font-size:9px;color:#e63000;letter-spacing:0.14em;text-transform:uppercase;margin-bottom:4px;}
.demo-example-t{font-size:12.5px;color:#222;line-height:1.7;}
.demo-footer{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:0.1em;text-transform:uppercase;color:#767676;margin-top:14px;padding-top:12px;border-top:1.5px dashed #ccc;text-align:center;}

/* SECTION */
.section{max-width:1180px;margin:0 auto;padding:72px 40px;}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:34px;gap:20px;flex-wrap:wrap;}
.sec-title{font-family:'Geist Mono',monospace;font-size:12px;font-weight:700;letter-spacing:0.16em;text-transform:uppercase;}
.sec-meta{font-family:'Geist Mono',monospace;font-size:10px;color:#767676;letter-spacing:0.08em;text-transform:uppercase;}

/* QUESTION-PILLS + TOPICS */
.questions-wrap{margin-bottom:14px;}
.questions-label{font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:0.16em;text-transform:uppercase;color:#767676;margin-bottom:14px;}
.questions-label strong{color:#0a0a0a;}
.questions{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px;}
.q-pill{font-family:'Geist Mono',monospace;font-size:11px;padding:8px 14px;border:1.5px solid #0a0a0a;color:#0a0a0a;background:transparent;text-decoration:none;letter-spacing:0.05em;cursor:pointer;transition:all .15s;}
.q-pill:hover{background:#0a0a0a;color:#fff;}
.q-pill.active{background:#e63000;color:#fff;border-color:#e63000;}
.topics{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:40px;padding-top:16px;border-top:1.5px dashed #ccc;}
.topics-l{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:0.12em;text-transform:uppercase;color:#767676;margin-right:8px;align-self:center;}
.topic{font-family:'Geist Mono',monospace;font-size:10px;padding:5px 10px;border:1.5px solid #999;color:#666;background:transparent;cursor:pointer;letter-spacing:0.06em;text-transform:uppercase;transition:all .15s;}
.topic:hover{border-color:#0a0a0a;color:#0a0a0a;}
.topic.active{background:#0a0a0a;color:#fff;border-color:#0a0a0a;}

/* BOOK GRID */
.books{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:36px;}
.book{display:flex;flex-direction:column;background:#fff;border:1.5px solid #0a0a0a;padding:20px;transition:transform .2s ease,box-shadow .2s ease;}
.book:hover{transform:translateY(-4px);box-shadow:-6px 6px 0 #0a0a0a;}
.book.hidden{display:none;}
.book-top{display:grid;grid-template-columns:80px minmax(0,1fr);gap:16px;margin-bottom:16px;}
.book-cover-svg{display:block;width:80px;height:120px;box-shadow:-3px 3px 0 #0a0a0a;border-radius:2px;}
.book-meta{display:flex;flex-direction:column;justify-content:space-between;min-width:0;}
.book-title{font-family:'Fraunces',serif;font-size:18px;font-weight:500;line-height:1.15;color:#0a0a0a;letter-spacing:-0.01em;margin-bottom:4px;text-wrap:balance;}
.book-author{font-family:'Geist Mono',monospace;font-size:10px;color:#767676;letter-spacing:0.08em;text-transform:uppercase;margin-bottom:10px;}
.book-topic{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:0.12em;text-transform:uppercase;color:#e63000;font-weight:600;}
.book-question{font-family:'Fraunces',serif;font-size:14.5px;font-style:italic;color:#333;line-height:1.45;margin-bottom:14px;padding-top:14px;border-top:1.5px solid #0a0a0a;min-height:58px;text-wrap:pretty;}
.book-layers{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1.5px solid #0a0a0a;margin-bottom:14px;}
.book-layer{padding:6px 4px;text-align:center;border-right:1.5px solid #0a0a0a;font-family:'Geist Mono',monospace;font-size:8px;letter-spacing:0.08em;text-transform:uppercase;color:#666;}
.book-layer:last-child{border-right:none;}
.book-layer strong{display:block;color:#0a0a0a;font-size:10px;margin-bottom:1px;}
.book-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:auto;}
.book-langs{display:flex;gap:4px;}
.book-lang{font-family:'Geist Mono',monospace;font-size:10px;padding:4px 8px;border:1.5px solid #0a0a0a;color:#0a0a0a;text-decoration:none;letter-spacing:0.04em;transition:all .15s;}
.book-lang:hover{background:#0a0a0a;color:#fff;}
.book-open{font-family:'Geist Mono',monospace;font-size:10px;color:#0a0a0a;text-decoration:none;letter-spacing:0.08em;text-transform:uppercase;font-weight:700;}
.book-open:hover{color:#e63000;}

/* HOW IT WORKS */
.how{background:#0a0a0a;padding:80px 40px;color:#fff;border-top:2px solid #0a0a0a;border-bottom:2px solid #0a0a0a;}
.how-inner{max-width:1180px;margin:0 auto;}
.how-label{font-family:'Geist Mono',monospace;font-size:11px;letter-spacing:0.20em;text-transform:uppercase;color:#e63000;font-weight:600;margin-bottom:16px;}
.how-heading{font-family:'Fraunces',serif;font-size:clamp(28px,3.8vw,44px);font-weight:600;line-height:1.1;letter-spacing:-0.01em;margin-bottom:48px;max-width:760px;}
.how-heading em{font-style:italic;color:#e63000;}
.how-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1.5px solid #222;}
.how-step{padding:28px 24px;border-right:1.5px solid #222;}
.how-step:last-child{border-right:none;}
.how-n{font-family:'Geist Mono',monospace;font-size:11px;letter-spacing:0.18em;color:#e63000;font-weight:600;margin-bottom:14px;}
.how-t{font-family:'Fraunces',serif;font-size:22px;font-weight:500;color:#fff;margin-bottom:12px;line-height:1.15;}
.how-b{font-size:13.5px;color:#888;line-height:1.85;margin-bottom:16px;}
.how-layers{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:14px;}
.how-layer{padding:8px 10px;border:1.5px solid #222;}
.how-layer-t{font-family:'Geist Mono',monospace;font-size:9px;color:#e63000;letter-spacing:0.12em;text-transform:uppercase;margin-bottom:2px;}
.how-layer-l{font-family:'Geist Mono',monospace;font-size:11px;color:#fff;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;}

/* ========================================================================
   BUCHSEITE
   ======================================================================== */

/* READING MODE SWITCHER */
.mode-bar{position:fixed;top:56px;left:0;right:0;z-index:99;background:#0a0a0a;border-bottom:2px solid #0a0a0a;padding:14px 40px;}
.mode-inner{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:20px;flex-wrap:wrap;}
.mode-label{font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:0.20em;text-transform:uppercase;color:#e63000;font-weight:600;}
.mode-pills{display:flex;gap:6px;flex-wrap:wrap;}
.mode-pill{font-family:'Geist Mono',monospace;font-size:11px;padding:7px 14px;border:1.5px solid #333;background:transparent;color:#888;cursor:pointer;letter-spacing:0.06em;text-transform:uppercase;transition:all .2s ease;display:flex;align-items:center;gap:8px;}
.mode-pill:hover{border-color:#e63000;color:#e63000;}
.mode-pill.active{background:#e63000;border-color:#e63000;color:#fff;}
.mode-pill .mode-time{font-size:9px;opacity:.7;}
.mode-pill.active .mode-time{opacity:1;}
.mode-reader{margin-left:auto;display:flex;align-items:center;gap:14px;color:#888;font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:0.08em;text-transform:uppercase;}
.mode-reader strong{color:#fff;font-weight:600;}
.progress-dots{display:flex;gap:4px;}
.progress-dots span{width:10px;height:10px;border-radius:50%;background:#222;border:1.5px solid #333;}
.progress-dots span.done{background:#e63000;border-color:#e63000;}

/* BOOK HERO */
.book-hero{padding:170px 40px 60px;max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:80px;align-items:start;}
.hero-author{font-family:'Geist Mono',monospace;font-size:13px;color:#666;text-transform:uppercase;letter-spacing:0.12em;margin-bottom:32px;}
.hero-stats{display:grid;grid-template-columns:repeat(3,auto);gap:0;border:1.5px solid #0a0a0a;background:#fff;width:fit-content;}
.hero-stat{padding:14px 22px;border-right:1.5px solid #0a0a0a;}
.hero-stat:last-child{border-right:none;}
.hero-stat-n{font-family:'Geist Mono',monospace;font-size:22px;font-weight:700;color:#0a0a0a;letter-spacing:-0.02em;}
.hero-stat-l{font-family:'Geist Mono',monospace;font-size:10px;color:#767676;letter-spacing:0.12em;text-transform:uppercase;margin-top:4px;}
.cover-col{position:sticky;top:170px;}
.cover-svg{display:block;width:100%;max-width:300px;box-shadow:-10px 10px 0 #0a0a0a;border-radius:2px;margin:0 auto;}
.cover-meta{margin-top:24px;font-family:'Geist Mono',monospace;font-size:10px;color:#767676;letter-spacing:0.08em;text-transform:uppercase;text-align:center;line-height:1.8;}
.cover-meta strong{color:#0a0a0a;}

/* CONCEPT */
.concept{background:#0a0a0a;color:#fff;padding:64px 40px;border-top:2px solid #0a0a0a;border-bottom:2px solid #0a0a0a;}
.concept-inner{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:320px minmax(0,1fr);gap:80px;align-items:start;}
.concept-label{font-family:'Geist Mono',monospace;font-size:11px;letter-spacing:0.20em;text-transform:uppercase;color:#e63000;font-weight:600;margin-bottom:16px;}
.concept-heading{font-family:'Fraunces',serif;font-size:32px;font-weight:600;line-height:1.1;letter-spacing:-0.01em;}
.concept-heading em{font-style:italic;color:#e63000;}
.concept-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1.5px solid #222;}
.concept-step{padding:24px 20px;border-right:1.5px solid #222;position:relative;}
.concept-step:last-child{border-right:none;}
.concept-step-time{font-family:'Geist Mono',monospace;font-size:10px;color:#e63000;letter-spacing:0.12em;text-transform:uppercase;font-weight:600;margin-bottom:10px;}
.concept-step-label{font-family:'Geist Mono',monospace;font-size:14px;color:#fff;font-weight:700;text-transform:uppercase;letter-spacing:0.04em;margin-bottom:10px;}
.concept-step-desc{font-size:12px;color:#888;line-height:1.7;}

/* IDEAS */
section{max-width:1180px;margin:0 auto;padding:72px 40px;border-bottom:1.5px solid #0a0a0a;}
.ideas{display:flex;flex-direction:column;gap:0;}
.idea{border-top:1.5px solid #0a0a0a;padding:36px 0;display:grid;grid-template-columns:80px minmax(0,1fr) 240px;gap:40px;position:relative;}
.idea:last-child{border-bottom:1.5px solid #0a0a0a;}
.idea-num{font-family:'Geist Mono',monospace;font-size:48px;font-weight:700;color:#0a0a0a;line-height:1;letter-spacing:-0.04em;}
.idea-num span{font-size:14px;color:#767676;display:block;margin-top:6px;letter-spacing:0.12em;}
.idea-body .layer{display:none;}
.idea-body .layer.visible{display:block;animation:fadeIn .3s ease;}
.layer-glance .idea-glance{font-family:'Fraunces',serif;font-size:26px;font-weight:400;line-height:1.3;letter-spacing:-0.01em;color:#0a0a0a;text-wrap:pretty;}
.layer-glance .idea-glance em{font-style:italic;color:#e63000;}
.layer-minute .idea-title,.layer-deep .idea-title,.layer-thread .idea-title{font-family:'Geist Mono',monospace;font-size:18px;font-weight:700;text-transform:uppercase;letter-spacing:0.04em;margin-bottom:14px;}
.layer-minute .idea-msg,.layer-deep .idea-msg{font-family:'Fraunces',serif;font-size:20px;font-weight:400;line-height:1.4;color:#0a0a0a;border-left:3px solid #e63000;padding-left:18px;margin-bottom:16px;font-style:italic;}
.layer-minute .idea-short{font-size:14px;color:#444;line-height:1.85;}
.layer-deep .idea-msg{margin-bottom:20px;}
.layer-deep .idea-para{font-size:14.5px;color:#333;line-height:1.9;margin-bottom:16px;text-wrap:pretty;}
.layer-deep .idea-para:last-of-type{margin-bottom:20px;}
.layer-deep .idea-example{background:#fff;border:1.5px solid #0a0a0a;padding:18px 20px;margin-bottom:20px;}
.layer-deep .idea-example-l{font-family:'Geist Mono',monospace;font-size:10px;color:#e63000;letter-spacing:0.14em;text-transform:uppercase;font-weight:600;margin-bottom:8px;}
.layer-deep .idea-example-t{font-size:13.5px;color:#222;line-height:1.85;}
.layer-thread .thread-blocks{display:flex;flex-direction:column;gap:16px;}
.layer-thread .thread-block{padding:16px 20px;border:1.5px solid #0a0a0a;background:#fff;}
.layer-thread .thread-block-l{font-family:'Geist Mono',monospace;font-size:10px;color:#e63000;letter-spacing:0.14em;text-transform:uppercase;font-weight:600;margin-bottom:8px;}
.layer-thread .thread-block-t{font-size:14px;color:#222;line-height:1.85;}
.layer-thread .thread-block-t em{font-style:italic;color:#e63000;}

/* Reflexion / Aside */
.idea-aside{position:sticky;top:180px;align-self:start;}
.reflect{background:#0a0a0a;color:#fff;padding:22px;border:2px solid #0a0a0a;}
.reflect-l{font-family:'Geist Mono',monospace;font-size:10px;letter-spacing:0.14em;text-transform:uppercase;color:#e63000;font-weight:600;margin-bottom:10px;display:flex;align-items:center;gap:8px;}
.reflect-l::before{content:"◆";color:#e63000;font-size:11px;}
.reflect-q{font-family:'Fraunces',serif;font-size:17px;font-weight:400;line-height:1.4;color:#fff;margin-bottom:16px;font-style:italic;}
.reflect-input{width:100%;background:transparent;border:none;border-top:1.5px dashed #333;padding:10px 0 4px;color:#fff;font-family:'Space Mono',monospace;font-size:12px;line-height:1.7;resize:vertical;min-height:70px;outline:none;}
.reflect-input::placeholder{color:#555;}
.reflect-foot{display:flex;justify-content:space-between;align-items:center;margin-top:12px;}
.reflect-count{font-family:'Geist Mono',monospace;font-size:9px;color:#555;letter-spacing:0.08em;text-transform:uppercase;}
.reflect-mark{font-family:'Geist Mono',monospace;font-size:9px;background:transparent;border:1.5px solid #333;color:#888;padding:5px 9px;cursor:pointer;letter-spacing:0.08em;text-transform:uppercase;}
.reflect-mark:hover{border-color:#e63000;color:#e63000;}
.reflect-mark.done{border-color:#e63000;background:#e63000;color:#fff;}

/* MAP */
.map{padding:80px 40px;background:#fff;border-bottom:2px solid #0a0a0a;}
.map-inner{max-width:1180px;margin:0 auto;}
.map-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:40px;}
.map-title{font-family:'Fraunces',serif;font-size:32px;font-weight:600;letter-spacing:-0.01em;}
.map-title em{font-style:italic;color:#e63000;}
.map-svg-wrap{border:1.5px solid #0a0a0a;background:#f5f2ec;padding:32px;overflow:hidden;position:relative;}
.map-svg{display:block;width:100%;height:auto;}

/* DECISION */
.decision{background:#0a0a0a;color:#fff;padding:80px 40px;}
.decision-inner{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:80px;align-items:center;}
.dec-label{font-family:'Geist Mono',monospace;font-size:11px;letter-spacing:0.20em;text-transform:uppercase;color:#e63000;font-weight:600;margin-bottom:18px;}
.dec-head{font-family:'Fraunces',serif;font-size:40px;font-weight:600;line-height:1.1;margin-bottom:22px;letter-spacing:-0.01em;}
.dec-head em{font-style:italic;color:#e63000;}
.dec-sub{font-size:15px;color:#999;line-height:1.85;max-width:440px;}
.dec-actions{display:flex;flex-direction:column;gap:10px;}
.dec-btn{font-family:'Geist Mono',monospace;font-size:12px;padding:18px 22px;background:transparent;color:#fff;text-decoration:none;letter-spacing:0.08em;text-transform:uppercase;border:2px solid #fff;display:flex;justify-content:space-between;align-items:center;transition:all .2s ease;cursor:pointer;}
.dec-btn:hover{background:#fff;color:#0a0a0a;}
.dec-btn.primary{background:#e63000;border-color:#e63000;}
.dec-btn.primary:hover{background:#fff;color:#0a0a0a;border-color:#fff;}
.dec-btn-arrow{font-size:14px;}

/* FOOTER */
footer{padding:24px 40px;max-width:1180px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;border-top:2px solid #0a0a0a;}
.foot-logo{font-family:'Geist Mono',monospace;font-size:14px;font-weight:700;color:#0a0a0a;letter-spacing:0.06em;text-transform:uppercase;}
.foot-logo span{color:#e63000;}
.foot-note{font-family:'Geist Mono',monospace;font-size:10px;color:#767676;letter-spacing:0.06em;text-transform:uppercase;}

/* ========================================================================
   RESPONSIVE
   ======================================================================== */
@media(max-width:900px){
  nav{padding:0 20px;}
  .nav-links{display:none;}
  .iotd{padding:12px 20px;}
  .iotd-source{display:none;}
  .hero{grid-template-columns:1fr;padding:180px 20px 48px;gap:40px;}
  .section{padding:48px 20px;}
  .books{grid-template-columns:1fr;gap:20px;}
  .how{padding:48px 20px;}
  .how-grid{grid-template-columns:1fr 1fr;}
  .how-step:nth-child(2){border-right:none;}
  .how-step:nth-child(1),.how-step:nth-child(2){border-bottom:1.5px solid #222;}

  .book-hero{grid-template-columns:1fr;padding:170px 24px 40px;gap:40px;}
  .cover-col{position:static;order:-1;}
  .concept{padding:48px 24px;}
  .concept-inner{grid-template-columns:1fr;gap:32px;}
  .concept-steps{grid-template-columns:1fr 1fr;}
  .concept-step:nth-child(2){border-right:none;}
  .concept-step:nth-child(1),.concept-step:nth-child(2){border-bottom:1.5px solid #222;}
  section{padding:48px 24px;}
  .idea{grid-template-columns:1fr;gap:20px;padding:28px 0;}
  .idea-aside{position:static;}
  .map{padding:48px 24px;}
  .decision{padding:48px 24px;}
  .decision-inner{grid-template-columns:1fr;gap:36px;}
  .mode-bar{padding:12px 20px;}
  .hero-stats{grid-template-columns:1fr;}
  .hero-stat{border-right:none;border-bottom:1.5px solid #0a0a0a;}
  .hero-stat:last-child{border-bottom:none;}
  footer{padding:20px 20px;}
}
@media(max-width:560px){
  .how-grid{grid-template-columns:1fr;}
  .how-step{border-right:none;border-bottom:1.5px solid #222;}
  .how-step:last-child{border-bottom:none;}
}