/* ==========================================================================
   YuSleeps US — Design System
   Calm nighttime editorial aesthetic. Dependency-free, hand-written CSS.
   ========================================================================== */

:root{
  --night-950:#0c0e1f;
  --night-900:#12142c;
  --night-800:#1b1e3d;
  --night-700:#272b52;
  --plum-500:#6d5aa8;
  --plum-400:#8a76c4;
  --plum-100:#efe9fb;
  --gold-500:#d9a441;
  --gold-600:#c08c2c;
  --paper-0:#ffffff;
  --paper-50:#faf9fc;
  --paper-100:#f3f1f8;
  --ink-900:#1b1c28;
  --ink-700:#3c3e52;
  --ink-500:#63667e;
  --ink-300:#9598ac;
  --line:#e4e1ee;
  --good:#2f7a4f;
  --warn:#9a6b12;
  --danger:#a4372e;
  --radius-md:12px;
  --radius-lg:20px;
  --shadow-sm:0 1px 3px rgba(18,20,44,.08);
  --shadow-md:0 8px 24px rgba(18,20,44,.10);
  --shadow-lg:0 16px 48px rgba(18,20,44,.16);
  --font-head:"Fraunces",Georgia,"Times New Roman",serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --maxw:1180px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper-50);
  color:var(--ink-900);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--plum-500)}
a:hover{color:var(--gold-600)}
h1,h2,h3,h4{
  font-family:var(--font-head);
  color:var(--night-900);
  line-height:1.2;
  margin:0 0 .6em;
  font-weight:600;
}
h1{font-size:clamp(2rem,4.2vw,3rem)}
h2{font-size:clamp(1.5rem,2.8vw,2.1rem)}
h3{font-size:1.3rem}
h4{font-size:1.1rem}
p{margin:0 0 1.1em}
ul,ol{margin:0 0 1.1em;padding-left:1.3em}
li{margin-bottom:.4em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.container-narrow{max-width:840px;margin:0 auto;padding:0 24px}
section{padding:64px 0}
section.tight{padding:36px 0}
:focus-visible{outline:3px solid var(--gold-500);outline-offset:2px}
.skip-link{position:absolute;left:-999px;top:auto;background:var(--night-900);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:200}
.skip-link:focus{left:0;top:0}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-body);font-weight:700;font-size:1rem;
  padding:14px 28px;border-radius:999px;text-decoration:none;
  border:2px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--gold-500);color:var(--night-950);box-shadow:var(--shadow-md)}
.btn-primary:hover{background:var(--gold-600);color:var(--night-950)}
.btn-outline{border-color:var(--paper-0);color:var(--paper-0);background:transparent}
.btn-outline:hover{background:rgba(255,255,255,.12);color:var(--paper-0)}
.btn-ghost{border-color:var(--plum-500);color:var(--plum-500);background:transparent}
.btn-ghost:hover{background:var(--plum-100);color:var(--plum-500)}
.btn-sm{padding:9px 18px;font-size:.9rem}
.btn-block{width:100%;justify-content:center}

/* ---------- Header / Nav ---------- */
.site-header{background:var(--night-950);position:sticky;top:0;z-index:100;border-bottom:1px solid rgba(255,255,255,.08)}
.nav-wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:14px 24px;max-width:var(--maxw);margin:0 auto;gap:12px 20px}
.brand{display:flex;align-items:center;gap:.6em;text-decoration:none;color:#fff;font-family:var(--font-head);font-weight:700;font-size:1.25rem;letter-spacing:.01em}
.brand img{height:34px;width:34px;border-radius:8px}
.nav-links{list-style:none;display:flex;gap:22px;margin:0;padding:0;flex-wrap:wrap}
.nav-links a{color:rgba(255,255,255,.82);text-decoration:none;font-size:.94rem;font-weight:500}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--gold-500)}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none}
.nav-links .nav-cta-mobile{display:none}
.nav-affiliate-note{color:rgba(255,255,255,.5);font-size:.72rem;text-align:right;line-height:1.3;max-width:180px;display:none}

@media (max-width:900px){
  .nav-links{
    position:fixed;inset:0 0 0 30%;background:var(--night-900);
    flex-direction:column;padding:96px 28px 28px;gap:6px;
    transform:translateX(100%);transition:transform .25s ease;overflow-y:auto;
  }
  .nav-links.open{transform:translateX(0)}
  .nav-links a{display:block;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08);font-size:1.05rem}
  .nav-toggle{
    display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
    width:40px;height:40px;background:none;border:1px solid rgba(255,255,255,.3);
    border-radius:8px;cursor:pointer;
  }
  .nav-toggle span{display:block;height:2px;width:20px;margin:0 auto;background:#fff}
  .nav-cta{display:none}
  .nav-links .nav-cta-mobile{display:block;margin-top:18px}
  .nav-links .nav-cta-mobile a{
    display:flex;justify-content:center;text-align:center;
    padding:14px 28px;border-bottom:none;width:100%;
  }
}

@media (max-width:360px){
  .nav-wrap{padding:12px 16px;gap:12px}
  .brand{font-size:1.1rem}
  .brand img{height:28px;width:28px}
}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(160deg,#050b1f 0%,#0a0f24 45%,#2f2740 100%);
  color:#fff;padding:64px 0 72px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse at 80% 0%,rgba(217,164,65,.16),transparent 55%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;position:relative}
.hero-eyebrow{
  display:inline-block;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);
  color:var(--gold-500);font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  padding:6px 14px;border-radius:999px;margin-bottom:18px;
}
.hero h1{color:#fff;margin-bottom:.45em}
.hero p.lead{color:rgba(255,255,255,.85);font-size:1.12rem;max-width:52ch}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.hero-image{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg)}
.hero-note{color:rgba(255,255,255,.55);font-size:.8rem;margin-top:14px}
@media (max-width:820px){.hero-grid{grid-template-columns:1fr}.hero-image{order:-1;max-width:340px;margin:0 auto}}

/* ---------- Page header (non-home) ---------- */
.page-hero{background:linear-gradient(160deg,var(--night-950),var(--night-800));color:#fff;padding:52px 0}
.page-hero h1{color:#fff;margin-bottom:.4em}
.page-hero p{color:rgba(255,255,255,.82);max-width:70ch;font-size:1.05rem;margin-bottom:0}
.breadcrumbs{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0 0 16px;font-size:.82rem;color:rgba(255,255,255,.55)}
.breadcrumbs li:not(:last-child)::after{content:"/";margin-left:8px;color:rgba(255,255,255,.35)}
.breadcrumbs a{color:rgba(255,255,255,.72);text-decoration:none}
.breadcrumbs a:hover{color:var(--gold-500)}

/* ---------- Section headers ---------- */
.section-head{max-width:70ch;margin:0 0 36px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{display:block;color:var(--plum-500);font-weight:700;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:.5em}
section.on-dark{background:var(--night-950);color:rgba(255,255,255,.86)}
section.on-dark h2,section.on-dark h3{color:#fff}
section.on-plum{background:linear-gradient(160deg,var(--plum-500),var(--night-800));color:#fff}
section.on-plum h2{color:#fff}
section.on-paper-alt{background:var(--paper-100)}

/* ---------- Cards / grids ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

.card{
  background:var(--paper-0);border:1px solid var(--line);border-radius:var(--radius-md);
  padding:28px;box-shadow:var(--shadow-sm);
}
.card h3{margin-bottom:.5em}
.card-icon{font-size:1.6rem;margin-bottom:.5em;display:block}

/* ---------- Evidence labels ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4em;font-size:.72rem;font-weight:700;
  letter-spacing:.03em;text-transform:uppercase;padding:5px 11px;border-radius:999px;margin:0 6px 10px 0;
}
.tag-supported{background:#e3f2e8;color:var(--good)}
.tag-limited{background:#fdf1dd;color:var(--warn)}
.tag-mixed{background:#fdeee0;color:#b5560f}
.tag-uncertain{background:#f1eef8;color:var(--plum-500)}
.tag-product{background:var(--plum-100);color:var(--plum-500)}
.tag-personal{background:#eef3fb;color:#2b5f9e}
.tag-education{background:#eaf4f4;color:#2c766f}

.evidence-card{border-left:4px solid var(--plum-500);background:var(--paper-0);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:22px 26px;margin-bottom:18px;box-shadow:var(--shadow-sm)}
.evidence-card.supported{border-color:var(--good)}
.evidence-card.limited{border-color:var(--warn)}
.evidence-card.uncertain{border-color:var(--plum-400)}
.evidence-card p:last-child{margin-bottom:0}
.evidence-card cite{display:block;font-size:.84rem;color:var(--ink-500);margin-top:8px;font-style:normal}
.evidence-card cite a{color:var(--ink-500);text-decoration:underline}

/* ---------- Pros / cons ---------- */
.pc-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media (max-width:700px){.pc-grid{grid-template-columns:1fr}}
.pc-card{border-radius:var(--radius-md);padding:26px}
.pc-pros{background:#eef7f0;border:1px solid #cfe9d6}
.pc-cons{background:#fbeeee;border:1px solid #f0d3d1}
.pc-card ul{padding-left:1.1em;margin-bottom:0}
.pc-card li{margin-bottom:.6em}

/* ---------- Steps ---------- */
.steps{list-style:none;padding:0;margin:0;counter-reset:step}
.steps li{
  counter-increment:step;position:relative;padding:0 0 28px 56px;
  border-left:2px solid var(--line);margin-left:20px;
}
.steps li:last-child{border-color:transparent;padding-bottom:0}
.steps li::before{
  content:counter(step);position:absolute;left:-21px;top:-2px;
  width:40px;height:40px;border-radius:50%;background:var(--plum-500);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-family:var(--font-head);
}

/* ---------- Table ---------- */
.table-wrap{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;min-width:520px;background:var(--paper-0)}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);font-size:.94rem}
thead th{background:var(--paper-100);font-family:var(--font-head);font-weight:600}
tbody tr:last-child td{border-bottom:none}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--paper-0);border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden}
.faq-item summary{
  cursor:pointer;list-style:none;padding:18px 22px;font-weight:600;font-family:var(--font-head);
  display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--night-900);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.4rem;color:var(--plum-500);flex-shrink:0;font-family:var(--font-body)}
.faq-item[open] summary::after{content:"–"}
.faq-item .faq-answer{padding:0 22px 20px;color:var(--ink-700)}
.faq-item .faq-answer p:last-child{margin-bottom:0}

/* ---------- Callouts ---------- */
.callout{border-radius:var(--radius-md);padding:22px 26px;margin:0 0 24px}
.callout-note{background:var(--plum-100);border:1px solid #ddd2f2}
.callout-warn{background:#fdf1dd;border:1px solid #f3ddab}
.callout-danger{background:#fbeeee;border:1px solid #f0d3d1}
.callout h4{margin-bottom:.4em}
.callout p:last-child{margin-bottom:0}

/* ---------- Trust bar ---------- */
.trust-bar{background:var(--night-900);color:rgba(255,255,255,.85);border-top:1px solid rgba(255,255,255,.08);border-bottom:1px solid rgba(255,255,255,.08)}
.trust-bar .container{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center;padding:18px 24px;font-size:.88rem}
.trust-bar strong{color:#fff}

/* ---------- Testimonial / photo strip (no fabricated claims) ---------- */
.photo-card{background:var(--paper-0);border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm)}
.photo-card img{aspect-ratio:4/5;object-fit:cover;width:100%}
.photo-card .cap{padding:12px 16px;font-size:.82rem;color:var(--ink-500)}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(135deg,var(--plum-500),var(--night-950));color:#fff;border-radius:var(--radius-lg);padding:48px;text-align:center}
.cta-band h2{color:#fff}
.cta-band p{color:rgba(255,255,255,.85);max-width:60ch;margin-left:auto;margin-right:auto}

/* ---------- Footer ---------- */
.site-footer{background:var(--night-950);color:rgba(255,255,255,.7);padding:56px 0 28px;font-size:.9rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h5{color:#fff;font-family:var(--font-head);font-size:.95rem;margin-bottom:14px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:9px}
.footer-grid a{color:rgba(255,255,255,.68);text-decoration:none}
.footer-grid a:hover{color:var(--gold-500)}
.footer-brand p{color:rgba(255,255,255,.6);max-width:38ch;font-size:.88rem}
.footer-legal{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;font-size:.78rem;color:rgba(255,255,255,.45);line-height:1.6}
.footer-legal p{margin-bottom:10px}

/* ---------- Utility ---------- */
.text-center{text-align:center}
.mt-0{margin-top:0}
.small{font-size:.86rem;color:var(--ink-500)}
.stack{display:flex;flex-direction:column;gap:10px}
.divider{height:1px;background:var(--line);margin:40px 0;border:none}
.badge-verify{background:#fdf1dd;color:var(--warn);font-size:.72rem;font-weight:700;padding:3px 9px;border-radius:6px;text-transform:uppercase}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn,.nav-links{transition:none}
}