/* ==========================================
   JOSH SNS — Mobile-First Landing Page
   Apple-Inspired Dark Theme
   ========================================== */

/* === Variables === */
:root {
    --bg: #000;
    --bg-alt: #0a0a0a;
    --bg-card: #111;
    --bg-card-hover: #181818;
    --border: rgba(255,255,255,.08);
    --border-light: rgba(255,255,255,.12);
    --text: #f5f5f7;
    --text-2: #a1a1a6;
    --text-3: #6e6e73;
    --accent: #447ACB;
    --accent-light: #5a8fd4;
    --accent-glow: rgba(68,122,203,.25);
    --green: #30d158;
    --red: #ff453a;
    --yellow: #ffd60a;
    --grad: linear-gradient(135deg,#447ACB 0%,#82b1ff 100%);
    --font: 'Noto Sans KR',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
    --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 20px; --r-full: 9999px;
    --ease: cubic-bezier(.25,.46,.45,.94);
}

/* === Reset === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.75;overflow-x:hidden}
img{max-width:100%;height:auto;display:block;border-radius:var(--r-md)}
a{text-decoration:none;color:inherit}
::selection{background:var(--accent);color:#fff}

.container{max-width:680px;margin:0 auto;padding:0 20px}

/* === Horizontal Rules (640px) === */
.hr-wrap{display:flex;justify-content:center;padding:0 20px}
.top-hr,.section-hr,.footer-hr{
    width:100%;
    max-width:640px;
    border:none;
    border-top:1px solid var(--border-light);
    margin:0;
}
.top-hr{margin-top:48px}
.footer-hr{margin-bottom:0}

/* === Nav === */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(0,0,0,.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border)}
.nav.scrolled{background:rgba(0,0,0,.92)}
.nav-inner{max-width:680px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:48px}
.nav-logo{font-size:1.05rem;font-weight:800;letter-spacing:-.02em}
.nav-logo span{color:var(--accent)}
.nav-links{display:none;position:fixed;top:48px;left:0;right:0;bottom:0;background:rgba(0,0,0,.97);backdrop-filter:blur(20px);flex-direction:column;justify-content:center;align-items:center;gap:28px}
.nav-links.active{display:flex}
.nav-links a{font-size:1.1rem;font-weight:500;color:var(--text-2)}
.nav-links a:hover{color:var(--text)}
.nav-cta{background:var(--accent)!important;color:#fff!important;padding:8px 20px;border-radius:var(--r-full);font-weight:600!important}
.nav-toggle{display:flex;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.nav-toggle span{width:20px;height:1.5px;background:var(--text);transition:.2s var(--ease);border-radius:2px}
.nav-toggle.active span:nth-child(1){transform:rotate(45deg) translate(4.6px,4.6px)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(4.6px,-4.6px)}

/* === Buttons === */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--r-full);font-family:var(--font);font-weight:600;cursor:pointer;border:none;transition:all .2s var(--ease);letter-spacing:-.01em}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 4px 16px var(--accent-glow)}
.btn-primary:hover{background:var(--accent-light);transform:translateY(-1px);box-shadow:0 6px 24px var(--accent-glow)}
.btn-ghost{background:transparent;color:var(--accent);border:1.5px solid var(--accent)}
.btn-ghost:hover{background:rgba(68,122,203,.1)}
.btn-lg{padding:14px 28px;font-size:.95rem}
.btn-xl{padding:18px 40px;font-size:1.05rem}

/* === Sections === */
.section{padding:80px 0}
.section-alt{background:var(--bg-alt)}
.section-header{text-align:center;margin-bottom:48px}
.eyebrow{font-size:.72rem;font-weight:600;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.section-title{font-size:1.6rem;font-weight:800;line-height:1.4;letter-spacing:-.03em;margin-bottom:16px;word-break:keep-all}
.section-desc{font-size:.9rem;color:var(--text-2);line-height:1.85;margin-bottom:8px;word-break:keep-all}
.section-desc-bold{font-size:.9rem;font-weight:600;color:var(--text);line-height:1.85;margin-top:12px;word-break:keep-all}
.gradient-text{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* === Hero === */
.hero{min-height:100vh;min-height:100dvh;display:flex;align-items:center;padding:80px 0 40px;position:relative;overflow:hidden}
.hero-bg{position:absolute;top:-40%;left:50%;transform:translateX(-50%);width:600px;height:600px;background:radial-gradient(circle,rgba(68,122,203,.1) 0%,transparent 70%);pointer-events:none}
.hero-content{position:relative;z-index:1;text-align:center}
.hero-eyebrow{font-size:.8rem;font-weight:600;color:var(--yellow);margin-bottom:20px;display:inline-flex;align-items:center;gap:8px;padding:6px 16px;background:rgba(255,214,10,.08);border:1px solid rgba(255,214,10,.2);border-radius:var(--r-full)}
.hero-eyebrow strong{font-weight:800}
.hero-title{font-size:1.75rem;font-weight:900;line-height:1.35;letter-spacing:-.04em;margin-bottom:20px;word-break:keep-all}
.hero-desc{font-size:.88rem;color:var(--text-2);line-height:1.85;margin-bottom:16px;word-break:keep-all}
.hero-proof{font-size:.82rem;color:var(--text-3);line-height:1.85;margin-bottom:28px;word-break:keep-all}
.hero-proof strong{color:var(--text-2)}
.hero-actions{display:flex;flex-direction:column;gap:12px;margin-bottom:40px}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.hero-stat{text-align:center;padding:12px 4px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r-md)}
.hero-stat-line{white-space:nowrap;display:flex;align-items:baseline;justify-content:center;gap:1px}
.hero-stat-num{font-size:1.3rem;font-weight:800;color:var(--text);line-height:1}
.hero-stat-suffix{font-size:.75rem;font-weight:700;color:var(--text)}
.hero-stat-label{display:block;font-size:.6rem;color:var(--text-3);margin-top:4px;line-height:1.3;white-space:nowrap}

.desktop-br{display:none}

/* === Case Studies === */
.case{margin-bottom:48px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r-xl);overflow:hidden}
.case:last-child{margin-bottom:0}
.case-label{display:inline-block;padding:6px 14px;background:rgba(68,122,203,.1);color:var(--accent);font-size:.72rem;font-weight:700;letter-spacing:.05em;margin:20px 20px 0;border-radius:var(--r-sm)}
.case-name{font-size:1.2rem;font-weight:800;letter-spacing:-.02em;padding:8px 20px 0}
.case-image{padding:16px 20px 0}
.case-image img{border-radius:var(--r-md);border:1px solid var(--border)}
.case-ba{padding:0 20px}
.case-before,.case-after{padding:16px 0}
.case-before h4,.case-after h4{font-size:.82rem;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:6px}
.case-before h4{color:var(--text-3)}
.case-before h4 i{color:var(--red);font-size:.75rem}
.case-after h4{color:var(--green)}
.case-after h4 i{color:var(--green);font-size:.75rem}
.case-before p{font-size:.83rem;color:var(--text-2);line-height:1.8;word-break:keep-all}
.case-before-quote{font-style:italic;font-size:.82rem!important;color:var(--text-3)!important;margin-top:12px;padding:10px 14px;background:rgba(255,255,255,.02);border-left:2px solid var(--border-light);border-radius:0 var(--r-sm) var(--r-sm) 0}
.case-detail{font-size:.83rem;color:var(--text-2);line-height:1.8;word-break:keep-all}
.case-metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:12px}
.metric{padding:10px;background:rgba(68,122,203,.06);border-radius:var(--r-sm);text-align:center}
.metric-val{display:block;font-size:1.05rem;font-weight:800;color:var(--text);line-height:1.2}
.metric-label{display:block;font-size:.65rem;color:var(--text-3);margin-top:2px}
.metric-highlight{background:rgba(48,209,88,.08);border:1px solid rgba(48,209,88,.15)}
.metric-highlight .metric-val{color:var(--green)}
.case-quote{margin:0 20px 20px;padding:16px;background:rgba(68,122,203,.05);border-left:3px solid var(--accent);border-radius:0 var(--r-sm) var(--r-sm) 0}
.case-quote p{font-size:.85rem;color:var(--text);font-style:italic;line-height:1.75;margin-bottom:6px;word-break:keep-all}
.case-quote span{font-size:.72rem;color:var(--text-3);font-weight:500}

/* === Compare Table (Desktop) === */
.compare-table{display:none}

/* === Compare Mobile Cards === */
.compare-mobile{display:flex;flex-direction:column;gap:12px;margin-bottom:40px}
.compare-m-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r-md);padding:16px;overflow:hidden}
.compare-m-cat{font-size:.75rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.compare-m-row{font-size:.82rem;color:var(--text-2);line-height:1.65;margin-bottom:8px;display:flex;align-items:flex-start;gap:8px;word-break:keep-all}
.compare-m-row:last-child{margin-bottom:0}
.compare-m-badge{flex-shrink:0;display:inline-block;padding:2px 8px;border-radius:var(--r-sm);font-size:.65rem;font-weight:700;min-width:36px;text-align:center}
.compare-m-badge.bad{background:rgba(255,69,58,.1);color:var(--red)}
.compare-m-badge.good{background:rgba(48,209,88,.1);color:var(--green)}

.compare-conclusion{text-align:center}
.compare-conclusion p{font-size:.88rem;color:var(--text-2);line-height:1.85;margin-bottom:12px;word-break:keep-all}
.compare-conclusion-highlight{font-size:.95rem;font-weight:700;color:var(--text);margin-top:16px;padding:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r-lg);line-height:1.75;word-break:keep-all}

/* === Reviews === */
.reviews-grid{display:grid;grid-template-columns:1fr;gap:12px}
.review-card{padding:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r-lg)}
.review-quote{color:var(--accent);font-size:.8rem;margin-bottom:8px;opacity:.5}
.review-card p{font-size:.85rem;color:var(--text);line-height:1.8;margin-bottom:10px;word-break:keep-all}
.review-author{font-size:.72rem;color:var(--text-3);font-weight:500}

/* === Steps === */
.steps{display:flex;flex-direction:column;gap:0;position:relative;padding-left:28px}
.steps::before{content:'';position:absolute;left:11px;top:8px;bottom:8px;width:2px;background:var(--border)}
.step{position:relative;padding-bottom:32px}
.step:last-child{padding-bottom:0}
.step-num{position:absolute;left:-28px;top:0;width:24px;height:24px;border-radius:50%;background:var(--accent);color:#fff;font-size:.7rem;font-weight:800;display:flex;align-items:center;justify-content:center;z-index:1}
.step-content h3{font-size:1rem;font-weight:700;margin-bottom:8px;letter-spacing:-.02em}
.step-content p{font-size:.85rem;color:var(--text-2);line-height:1.85;margin-bottom:8px;word-break:keep-all}
.step-content ul{padding-left:20px;margin-bottom:8px}
.step-content li{font-size:.82rem;color:var(--text-2);line-height:1.7;margin-bottom:4px}
.step-note{font-size:.78rem;color:var(--accent);font-weight:500;padding:10px 14px;background:rgba(68,122,203,.06);border-radius:var(--r-sm);border-left:2px solid var(--accent);word-break:keep-all}
.step-image{margin-top:16px}
.step-image-label{font-size:.7rem;color:var(--text-3);font-style:italic;margin-bottom:8px}
.step-image img{border:1px solid var(--border);border-radius:var(--r-md)}

/* === About === */
.about-content{display:flex;flex-direction:column;gap:24px}
.about-image img{border:1px solid var(--border);border-radius:var(--r-lg)}
.about-text p{font-size:.88rem;color:var(--text-2);line-height:1.9;margin-bottom:14px;word-break:keep-all}
.about-emphasis{font-size:.9rem!important;color:var(--text)!important;font-weight:600;padding:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r-md);border-left:3px solid var(--accent);line-height:1.8!important}
.about-proof{margin-top:8px}
.about-proof img{border:1px solid var(--border);border-radius:var(--r-md)}

/* === CTA === */
.section-cta{background:var(--bg);position:relative;overflow:hidden;padding:80px 0 100px}
.section-cta::before{content:'';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:500px;height:500px;background:radial-gradient(circle,rgba(68,122,203,.1) 0%,transparent 70%);pointer-events:none}
.cta-content{text-align:center;position:relative;z-index:1}
.cta-title{font-size:1.6rem;font-weight:900;letter-spacing:-.04em;line-height:1.4;margin-bottom:20px;word-break:keep-all}
.cta-desc{font-size:.9rem;color:var(--text-2);line-height:1.85;margin-bottom:8px;word-break:keep-all}
.cta-sub{font-size:.85rem;color:var(--text-3);line-height:1.75;margin-bottom:24px;word-break:keep-all}
.cta-slot{display:inline-flex;align-items:center;gap:8px;padding:8px 20px;background:rgba(255,214,10,.08);border:1px solid rgba(255,214,10,.2);border-radius:var(--r-full);font-size:.82rem;color:var(--yellow);margin-bottom:24px}
.cta-promise{font-size:.82rem;color:var(--text-3);margin-top:16px;word-break:keep-all}
.pulse-dot{width:8px;height:8px;background:var(--green);border-radius:50%;animation:pulse 2s ease-in-out infinite;flex-shrink:0}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(1.3)}}
.cta-btn{animation:ctaGlow 3s ease-in-out infinite}
@keyframes ctaGlow{0%,100%{box-shadow:0 4px 16px var(--accent-glow)}50%{box-shadow:0 8px 32px rgba(68,122,203,.4)}}

/* === Footer === */
.footer{padding:24px 0}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center;padding-top:20px}
.footer-logo{font-size:.9rem;font-weight:800;letter-spacing:-.02em}
.footer-logo span{color:var(--accent)}
.footer-inner p{font-size:.68rem;color:var(--text-3)}

/* === Floating CTA === */
.floating-cta{position:fixed;bottom:16px;left:16px;right:16px;z-index:999;opacity:0;transform:translateY(20px);transition:all .4s var(--ease);pointer-events:none}
.floating-cta.visible{opacity:1;transform:translateY(0);pointer-events:all}
.btn-float{width:100%;padding:14px;font-size:.9rem;box-shadow:0 8px 32px rgba(68,122,203,.4)}
.float-badge{font-size:.65rem;font-weight:700;background:rgba(255,255,255,.2);padding:2px 8px;border-radius:var(--r-full);margin-right:4px}

/* === Animations === */
.anim{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.anim.visible{opacity:1;transform:translateY(0)}

/* ==========================================
   Desktop (768px+)
   ========================================== */
@media(min-width:768px){
    .container{max-width:800px;padding:0 32px}
    .section{padding:120px 0}
    .section-title{font-size:2.2rem}
    .section-desc,.section-desc-bold{font-size:1rem}
    .desktop-br{display:inline}
    .hero{padding:120px 0 80px}
    .hero-title{font-size:2.8rem}
    .hero-desc{font-size:1rem}
    .hero-proof{font-size:.9rem}
    .hero-actions{flex-direction:row;justify-content:center;gap:16px}
    .hero-stats{gap:16px}
    .hero-stat{padding:16px 8px}
    .hero-stat-num{font-size:1.6rem}
    .hero-stat-suffix{font-size:.85rem}
    .hero-stat-label{font-size:.7rem}
    .nav-links{display:flex;position:static;background:none;flex-direction:row;gap:28px}
    .nav-links a{font-size:.82rem}
    .nav-toggle{display:none}
    .nav-inner{max-width:800px}
    .case-name{font-size:1.4rem}
    .case-metrics{grid-template-columns:repeat(3,1fr)}
    .compare-table{display:block;margin-bottom:40px;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden}
    .compare-mobile{display:none}
    .compare-row{display:grid;grid-template-columns:120px 1fr 1fr;border-bottom:1px solid var(--border)}
    .compare-row:last-child{border-bottom:none}
    .compare-header-row{background:var(--bg-card)}
    .compare-cell{padding:14px 16px;font-size:.82rem;color:var(--text-2);line-height:1.5}
    .compare-category{font-weight:700;color:var(--text-3);font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;display:flex;align-items:center}
    .compare-other{border-right:1px solid var(--border)}
    .compare-josh{color:var(--accent);font-weight:500}
    .compare-header-row .compare-other,.compare-header-row .compare-josh{font-weight:700;font-size:.78rem;color:var(--text)}
    .compare-header-row .compare-josh{color:var(--accent)}
    .reviews-grid{grid-template-columns:1fr 1fr;gap:16px}
    .about-image{max-width:600px;margin:0 auto}
    .about-proof{max-width:600px;margin:8px auto 0}
    .cta-title{font-size:2.2rem}
    .floating-cta{left:auto;right:24px;bottom:24px;width:auto}
    .btn-float{width:auto;padding:14px 28px}
    .section-cta{padding:120px 0 140px}
    .hr-wrap{padding:0 32px}
}

@media(min-width:1024px){
    .container{max-width:960px;padding:0 40px}
    .nav-inner{max-width:960px}
    .hero-title{font-size:3.2rem}
    .section-title{font-size:2.6rem}
    .case-metrics{grid-template-columns:repeat(5,1fr)}
    .compare-row{grid-template-columns:140px 1fr 1fr}
    .reviews-grid{grid-template-columns:repeat(3,1fr)}
    .hr-wrap{padding:0 40px}
}

/* === Small mobile (375px and below) === */
@media(max-width:374px){
    .hero-stat-num{font-size:1.1rem}
    .hero-stat-suffix{font-size:.65rem}
    .hero-stat-label{font-size:.55rem}
    .hero-title{font-size:1.5rem}
    .section-title{font-size:1.4rem}
    .btn-lg{padding:12px 20px;font-size:.88rem}
    .btn-xl{padding:16px 32px;font-size:.95rem}
}