/* ======= GUIDE PAGE — NestSense Dark Theme ======= */
*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0A0C10;--bg2:#111318;--bg3:#181B22;--surface:#1E2028;--surface2:#262933;--text:#E8E9ED;--text2:#9DA0AB;--text3:#6B6F7B;--accent:#6EE7B7;--accent2:#34D399;--accentG:linear-gradient(135deg,#6EE7B7,#3B82F6);--blue:#3B82F6;--blue2:#60A5FA;--purple:#A78BFA;--rose:#FB7185;--amber:#FBBF24;--teal:#2DD4BF;--coral:#F87171;--glow:0 0 40px rgba(110,231,183,0.15);--radius:16px}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Outfit',sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden;line-height:1.7}
h1,h2,h3,h4{font-family:'Playfair Display',serif;font-weight:700;line-height:1.2}
a{color:inherit;text-decoration:none}
.container{max-width:1160px;margin:0 auto;padding:0 24px}

/* ======= TAB NAV ======= */
.tab-nav{position:sticky;top:0;z-index:100;background:rgba(10,12,16,0.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--surface2);padding:0}
.tab-nav .container{display:flex;align-items:center;gap:32px;height:56px}
.tab-nav .nav-logo{font-family:'Playfair Display',serif;font-size:1.1rem;font-weight:700;color:var(--text)}
.tab-nav .nav-logo em{color:var(--accent);font-style:italic}
.tab-links{display:flex;gap:4px;margin-left:auto}
.tab-links a{display:flex;align-items:center;gap:6px;padding:8px 15px;border-radius:8px;font-size:.82rem;font-weight:600;color:var(--text3);transition:all .2s;white-space:nowrap}
.tab-links a:hover{color:var(--text);background:var(--surface)}
.tab-links a.active{color:var(--accent);background:rgba(110,231,183,0.08)}

/* ======= SECTION SHARED ======= */
section{padding:100px 0}
.section-label{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:5px 14px;border-radius:30px;margin-bottom:14px}
.section-title{font-size:clamp(1.8rem,4vw,2.8rem);margin-bottom:12px;color:var(--text)}
.section-subtitle{font-size:1rem;color:var(--text2);max-width:640px;margin-bottom:48px}

/* ======= PROBLEM SECTION ======= */
.problem{background:var(--bg2)}
.problem .section-label{background:rgba(248,113,113,0.1);color:var(--coral)}

.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-top:48px}
.stat-box{text-align:center;padding:28px 20px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--surface2)}
.stat-number{font-family:'Playfair Display',serif;font-size:2.5rem;font-weight:900;color:var(--coral);line-height:1}
.stat-label{font-size:.85rem;color:var(--text3);margin-top:6px}

.problem-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:40px}
.problem-card{background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius);padding:28px;transition:transform .3s}
.problem-card:hover{transform:translateY(-4px)}
.problem-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:14px;background:rgba(255,255,255,0.04)}
.problem-card h3{font-size:1.15rem;margin-bottom:6px;color:var(--text)}
.problem-card p{font-size:.9rem;color:var(--text2)}

/* ======= PAIN SCIENCE ======= */
.pain-science{background:var(--bg);position:relative;overflow:hidden}
.pain-science::before{content:'';position:absolute;width:100%;height:100%;background:radial-gradient(ellipse at 80% 20%,rgba(167,139,250,0.05) 0%,transparent 60%),radial-gradient(ellipse at 20% 80%,rgba(110,231,183,0.03) 0%,transparent 60%)}
.pain-science .container{position:relative;z-index:2}
.pain-science .section-label{background:rgba(167,139,250,0.1);color:var(--purple)}

.timeline{position:relative;padding-left:40px;margin-top:40px}
.timeline::before{content:'';position:absolute;left:14px;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,var(--coral),var(--accent),var(--blue))}
.timeline-item{position:relative;margin-bottom:32px;padding:22px 26px;background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius)}
.timeline-item::before{content:'';position:absolute;left:-33px;top:28px;width:12px;height:12px;border-radius:50%;border:2px solid var(--coral);background:var(--bg)}
.timeline-item h3{font-size:1.1rem;color:var(--accent);margin-bottom:6px}
.timeline-item p{font-size:.92rem;color:var(--text2)}

.callout-box{margin-top:40px;background:rgba(248,113,113,0.06);border-left:3px solid var(--coral);border-radius:0 var(--radius) var(--radius) 0;padding:22px 26px}
.callout-box h4{color:var(--coral);margin-bottom:6px;font-size:1.05rem}
.callout-box p{color:var(--text2);font-size:.92rem}

/* ======= TRADITIONAL TOOLS ======= */
.tools-old{background:var(--bg2)}
.tools-old .section-label{background:rgba(251,191,36,0.1);color:var(--amber)}

.scale-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin-top:40px}
.scale-card{background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius);padding:26px;position:relative;overflow:hidden}
.scale-card::after{content:attr(data-age);position:absolute;top:14px;right:14px;background:var(--bg3);padding:3px 10px;border-radius:20px;font-size:.7rem;font-weight:600;color:var(--amber)}
.scale-card h3{font-size:1.05rem;color:var(--text);margin-bottom:4px}
.scale-card .scale-what{font-size:.82rem;color:var(--purple);font-weight:600;margin-bottom:8px}
.scale-card p{font-size:.88rem;color:var(--text2)}

.limitation-banner{margin-top:40px;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.limitation-item{background:var(--surface);border:1px solid var(--surface2);border-radius:14px;padding:20px;text-align:center}
.limitation-item .lim-icon{font-size:1.8rem;margin-bottom:8px}
.limitation-item h4{font-size:.92rem;color:var(--text);margin-bottom:3px}
.limitation-item p{font-size:.8rem;color:var(--text3)}

/* ======= AI SECTION ======= */
.ai-section{background:var(--bg)}
.ai-section .section-label{background:rgba(110,231,183,0.1);color:var(--accent)}

.ai-modality-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;margin-top:40px}

.ai-card{border-radius:20px;padding:32px;position:relative;overflow:hidden;transition:transform .3s;border:1px solid var(--surface2)}
.ai-card:hover{transform:translateY(-4px)}

.ai-card.vision{background:linear-gradient(135deg,rgba(167,139,250,0.08),rgba(167,139,250,0.03))}
.ai-card.audio{background:linear-gradient(135deg,rgba(59,130,246,0.08),rgba(59,130,246,0.03))}
.ai-card.thermal{background:linear-gradient(135deg,rgba(248,113,113,0.08),rgba(248,113,113,0.03))}
.ai-card.fusion{background:linear-gradient(135deg,rgba(110,231,183,0.08),rgba(110,231,183,0.03));grid-column:1 / -1}

.ai-card-tag{display:inline-block;padding:3px 11px;border-radius:20px;font-size:.7rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;margin-bottom:10px}
.ai-card.vision .ai-card-tag{background:rgba(167,139,250,0.12);color:var(--purple)}
.ai-card.audio .ai-card-tag{background:rgba(59,130,246,0.12);color:var(--blue2)}
.ai-card.thermal .ai-card-tag{background:rgba(248,113,113,0.12);color:var(--coral)}
.ai-card.fusion .ai-card-tag{background:rgba(110,231,183,0.12);color:var(--accent)}

.ai-card h3{font-size:1.25rem;color:var(--text);margin-bottom:8px}
.ai-card p{font-size:.92rem;color:var(--text2);margin-bottom:14px}

.ai-accuracy{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,0.04);border:1px solid var(--surface2);padding:6px 14px;border-radius:30px;font-size:.82rem;font-weight:600;color:var(--text2)}
.ai-accuracy .acc-dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}

.how-it-works-flow{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.guide-flow-step{background:var(--surface);border:1px solid var(--surface2);padding:8px 14px;border-radius:10px;font-size:.8rem;font-weight:500;color:var(--text2);display:flex;align-items:center;gap:7px}
.guide-flow-step .step-num{width:20px;height:20px;border-radius:50%;background:var(--accentG);color:var(--bg);font-size:.68rem;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.flow-arrow{font-size:1rem;color:var(--text3);display:flex;align-items:center}

/* Comparison bars */
.comparison-visual{margin-top:48px;max-width:700px}
.bar-group{margin-bottom:16px}
.bar-label{font-size:.85rem;font-weight:600;color:var(--text);margin-bottom:5px}
.bar-track{height:30px;background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius);overflow:hidden;position:relative}
.bar-fill{height:100%;border-radius:var(--radius);display:flex;align-items:center;justify-content:flex-end;padding-right:12px;font-size:.76rem;font-weight:700;color:var(--bg);transition:width 1.5s ease}

/* ======= APPS ======= */
.apps{background:var(--bg2)}
.apps .section-label{background:rgba(167,139,250,0.1);color:var(--purple)}

.app-category{margin-bottom:44px}
.app-category h3{font-family:'Outfit',sans-serif;font-size:1.2rem;font-weight:700;color:var(--text);margin-bottom:6px;display:flex;align-items:center;gap:8px}
.app-category>p{font-size:.92rem;color:var(--text2);margin-bottom:18px}

.app-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.app-item{background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius);padding:22px;transition:transform .3s}
.app-item:hover{transform:translateY(-3px)}
.app-item h4{font-family:'Outfit',sans-serif;font-size:.95rem;font-weight:700;color:var(--text);margin-bottom:5px}
.app-item p{font-size:.84rem;color:var(--text2)}
.app-highlight{display:inline-block;background:rgba(110,231,183,0.1);color:var(--accent);padding:2px 10px;border-radius:10px;font-size:.72rem;font-weight:600;margin-top:8px}

/* ======= BIOMARKERS ======= */
.biomarkers{background:var(--bg)}
.biomarkers .section-label{background:rgba(59,130,246,0.1);color:var(--blue2)}

.bio-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:40px}
.bio-card{border-radius:20px;padding:28px;border:1px solid var(--surface2);position:relative}
.bio-card.teeth{background:linear-gradient(135deg,rgba(251,191,36,0.06),rgba(251,191,36,0.02))}
.bio-card.gut{background:linear-gradient(135deg,rgba(110,231,183,0.06),rgba(110,231,183,0.02))}
.bio-card.brain{background:linear-gradient(135deg,rgba(59,130,246,0.06),rgba(59,130,246,0.02))}
.bio-card.stress{background:linear-gradient(135deg,rgba(167,139,250,0.06),rgba(167,139,250,0.02))}
.bio-card.toxins{background:linear-gradient(135deg,rgba(248,113,113,0.06),rgba(248,113,113,0.02))}
.bio-card.wearable{background:linear-gradient(135deg,rgba(45,212,191,0.06),rgba(45,212,191,0.02))}

.bio-card-icon{font-size:2rem;margin-bottom:10px}
.bio-card h3{font-size:1.1rem;color:var(--text);margin-bottom:6px}
.bio-card p{font-size:.88rem;color:var(--text2)}
.bio-tag{display:inline-block;margin-top:10px;padding:3px 11px;border-radius:20px;font-size:.7rem;font-weight:600;background:rgba(255,255,255,0.04);border:1px solid var(--surface2);color:var(--text3)}

/* ======= WEARABLES ======= */
.wearables{background:var(--bg2)}
.wearables .section-label{background:rgba(45,212,191,0.1);color:var(--teal)}

.wearable-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;margin-top:40px}
.wearable-card{background:var(--surface);border:1px solid var(--surface2);border-radius:18px;padding:24px;text-align:center;transition:transform .3s}
.wearable-card:hover{transform:translateY(-4px)}
.wearable-card .w-icon{font-size:2.2rem;margin-bottom:10px}
.wearable-card h4{font-family:'Outfit',sans-serif;font-size:.95rem;font-weight:700;color:var(--text);margin-bottom:5px}
.wearable-card p{font-size:.84rem;color:var(--text2)}

/* ======= ETHICS ======= */
.ethics{background:var(--bg);position:relative;overflow:hidden}
.ethics::after{content:'';position:absolute;width:400px;height:400px;background:radial-gradient(circle,rgba(251,191,36,0.04) 0%,transparent 70%);top:-100px;right:-100px;border-radius:50%}
.ethics .container{position:relative;z-index:2}
.ethics .section-label{background:rgba(251,191,36,0.1);color:var(--amber)}

.ethics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin-top:40px}
.ethic-card{background:var(--surface);border:1px solid var(--surface2);border-radius:18px;padding:26px}
.ethic-card .e-icon{font-size:1.6rem;margin-bottom:10px}
.ethic-card h3{font-size:1.05rem;color:var(--accent);margin-bottom:6px}
.ethic-card p{font-size:.88rem;color:var(--text2)}

/* ======= FUTURE ======= */
.future{background:var(--bg2)}
.future .section-label{background:rgba(110,231,183,0.1);color:var(--accent)}

.future-layers{display:grid;grid-template-columns:1fr;gap:16px;margin-top:40px;max-width:800px}
.future-layer{display:flex;align-items:flex-start;gap:18px;background:var(--surface);border:1px solid var(--surface2);border-radius:18px;padding:26px}
.future-layer .fl-num{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:'Playfair Display',serif;font-weight:900;font-size:1.1rem;color:var(--bg);flex-shrink:0}
.future-layer:nth-child(1) .fl-num{background:var(--coral)}
.future-layer:nth-child(2) .fl-num{background:var(--purple)}
.future-layer:nth-child(3) .fl-num{background:var(--blue)}
.future-layer:nth-child(4) .fl-num{background:var(--accent)}
.future-layer h3{font-size:1.05rem;color:var(--text);margin-bottom:5px}
.future-layer p{font-size:.88rem;color:var(--text2)}

/* ======= FOOTER ======= */
footer{padding:56px 0 36px;text-align:center;background:var(--bg);border-top:1px solid var(--surface2)}
footer .logo{font-family:'Playfair Display',serif;font-size:1.3rem;font-weight:700;margin-bottom:10px}
footer .logo em{color:var(--accent);font-style:italic}
footer p{font-size:.78rem;color:var(--text3);max-width:500px;margin:0 auto 6px}

/* ======= RESPONSIVE ======= */
@media(max-width:768px){section{padding:64px 0}.ai-modality-grid{grid-template-columns:1fr}.ai-card.fusion{grid-column:auto}.future-layer{flex-direction:column}.how-it-works-flow{flex-direction:column}.flow-arrow{transform:rotate(90deg)}.tab-links{overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none;-webkit-overflow-scrolling:touch}.tab-links::-webkit-scrollbar{display:none}.tab-links a{padding:6px 10px;font-size:.72rem}}

/* ======= SCROLL REVEAL ======= */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}