/* Tide Nest Relaxing — night sky theme, matched to the YouTube banner */
:root{
  --night:#070f1f; --deep:#0d1c33; --tide:#132a4a; --line:rgba(232,225,211,.13);
  --moon:#ede6d6; --soft:#a7b2c0; --gold:#d4ad62; --gold2:#e8c987;
  --serif:"Cormorant Garamond",Georgia,serif; --sans:"Montserrat",system-ui,sans-serif;
  --header-h:84px;
  color-scheme:dark;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--night);color:var(--moon);font-family:var(--sans);font-weight:300;line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.wrap{max-width:1240px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:12px;background:var(--gold);color:var(--night);padding:10px 16px;z-index:100}
.skip:focus{left:12px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.eyebrow{font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--gold);font-weight:500}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.1}
h1 em,h2 em{color:var(--gold2)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 26px;font-size:12px;letter-spacing:.18em;text-transform:uppercase;font-weight:600;transition:all .3s;border:1px solid transparent;cursor:pointer;font-family:var(--sans);border-radius:999px;white-space:nowrap}
.btn svg{width:18px;height:18px;flex:none}
.btn-gold{background:var(--gold);color:var(--night)}
.btn-gold:hover{background:var(--gold2)}
.btn-ghost{border-color:var(--line);color:var(--moon);background:transparent}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.link-gold{color:var(--gold);border-bottom:1px solid rgba(212,173,98,.4);padding-bottom:2px;transition:border-color .2s}
.link-gold:hover{border-color:var(--gold)}

/* Header */
.site-header{position:fixed;inset:0 0 auto;z-index:50;border-bottom:1px solid transparent;transition:background-color .3s,border-color .3s,backdrop-filter .3s}
.site-header.scrolled{background:rgba(7,15,31,.86);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom-color:var(--line)}
.menu-open .site-header{background:transparent;border-bottom-color:transparent;-webkit-backdrop-filter:none;backdrop-filter:none}
.site-header nav{display:flex;justify-content:space-between;align-items:center;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:600;font-size:26px;color:var(--gold2);white-space:nowrap}
.logo svg{width:28px;height:28px;flex:none}
.nav-links{display:flex;gap:36px;font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--soft)}
.nav-links a{position:relative;padding:6px 0;transition:color .2s}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--moon)}
.nav-links a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--gold)}
.nav-cta{display:flex;align-items:center;gap:12px}
.menu-btn{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:50%;background:rgba(7,15,31,.5);color:var(--moon);cursor:pointer;position:relative}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{position:absolute;left:13px;right:13px;height:1px;background:currentColor;content:"";transition:transform .3s}
.menu-btn span{top:50%}
.menu-btn span::before{left:0;right:0;top:-6px}
.menu-btn span::after{left:0;right:0;top:6px}
.menu-open .menu-btn span{background:transparent}
.menu-open .menu-btn span::before{transform:translateY(6px) rotate(45deg)}
.menu-open .menu-btn span::after{transform:translateY(-6px) rotate(-45deg)}
.mobile-menu{display:none}

/* Banner (channel art) */
.banner{position:relative;height:clamp(300px,36vw,560px);overflow:hidden;background:var(--deep)}
.banner img{width:100%;height:100%;object-fit:cover;object-position:50% 52%}
.banner::after{content:"";position:absolute;inset:auto 0 0;height:45%;background:linear-gradient(180deg,transparent,var(--night))}

/* Channel header */
.channel{position:relative;z-index:2;margin-top:-70px;padding-bottom:20px}
.channel-row{display:flex;align-items:flex-end;gap:28px;flex-wrap:wrap}
.avatar{width:148px;height:148px;border-radius:50%;padding:4px;background:linear-gradient(135deg,var(--gold2),#9a7a3c);flex:none;box-shadow:0 20px 40px -18px #000}
.avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover;border:3px solid var(--night)}
.channel-info{flex:1;min-width:260px;padding-bottom:6px}
.channel-info h1{font-size:clamp(40px,5vw,60px);font-weight:600;color:var(--moon)}
.channel-info .tagline{display:block;font-family:var(--sans);font-weight:300;line-height:1.5;color:var(--soft);font-size:17px;margin-top:8px}
.channel-meta{display:flex;gap:10px 22px;flex-wrap:wrap;margin-top:10px;font-size:13px;color:var(--soft)}
.channel-meta>span{display:inline-flex;align-items:center;white-space:pre}
.channel-meta>span+span::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--gold);margin-right:8px}
.channel-actions{display:flex;gap:12px;flex-wrap:wrap;padding-bottom:8px}

/* Video gallery */
.videos{padding:40px 0 110px}
.videos-head{display:flex;justify-content:space-between;align-items:end;gap:20px;flex-wrap:wrap;padding-top:30px;border-top:1px solid var(--line);margin-bottom:24px}
.videos-head h2{font-size:clamp(32px,3.6vw,44px)}
.videos-head p{color:var(--soft);font-size:14px}
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:34px}
.chip{font:inherit;font-size:13px;font-weight:500;color:var(--soft);background:transparent;border:1px solid var(--line);padding:9px 18px;border-radius:999px;cursor:pointer;transition:all .2s}
.chip:hover{color:var(--moon);border-color:rgba(212,173,98,.5)}
.chip[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:var(--night)}
.vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px 28px}
.vcard[hidden]{display:none}
.vcard a{display:block}
.thumb{position:relative;display:block;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:var(--deep);border:1px solid var(--line)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease,filter .4s}
.vcard a:hover .thumb img{transform:scale(1.04);filter:brightness(.8)}
.dur{position:absolute;right:10px;bottom:10px;background:rgba(7,15,31,.85);color:var(--moon);font-size:12px;font-weight:500;padding:3px 8px;border-radius:6px;letter-spacing:.04em}
.play{position:absolute;left:50%;top:50%;width:62px;height:62px;margin:-31px 0 0 -31px;border-radius:50%;background:rgba(212,173,98,.95);opacity:0;transform:scale(.8);transition:all .3s;box-shadow:0 10px 30px -8px #000}
.play::after{content:"";position:absolute;left:25px;top:20px;border-style:solid;border-width:11px 0 11px 17px;border-color:transparent transparent transparent var(--night)}
.vcard a:hover .play,.vcard a:focus-visible .play{opacity:1;transform:scale(1)}
.vtitle{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:16px;font-size:15px;font-weight:500;line-height:1.5;color:var(--moon);transition:color .2s}
.vcard a:hover .vtitle{color:var(--gold2)}
.vtags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.vtags span{font-size:11px;letter-spacing:.06em;color:var(--soft);border:1px solid var(--line);border-radius:999px;padding:2px 10px}
.empty{color:var(--soft);padding:40px 0;text-align:center}
.more{text-align:center;margin-top:60px}

/* Player dialog */
.player{border:0;padding:0;background:transparent;color:var(--moon);width:min(1100px,94vw);max-width:none;max-height:none;margin:auto}
.player::backdrop{background:rgba(3,7,15,.9);backdrop-filter:blur(4px)}
.player-frame{position:relative;aspect-ratio:16/9;background:#000;border-radius:10px;overflow:hidden;box-shadow:0 30px 80px -20px #000}
.player-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.player-bar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:14px}
.player-title{font-size:15px;font-weight:500;flex:1;min-width:0}
.player-bar .actions{display:flex;gap:10px;flex:none}
.player-bar .btn{padding:10px 18px}

/* Section shared */
section{padding:120px 0}
.head{text-align:center;max-width:680px;margin:0 auto 60px}
.head h2{font-size:clamp(38px,4.6vw,58px);margin-top:14px}
.head p{color:var(--soft);margin-top:14px}
.bg-deep{background:var(--deep)}

/* Features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.feature{background:var(--deep);padding:40px 30px}
.feature .ic{width:52px;height:52px;border:1px solid var(--gold);border-radius:50%;display:grid;place-items:center;color:var(--gold);margin-bottom:22px}
.feature h3{font-size:26px;margin-bottom:8px}
.feature p{color:var(--soft);font-size:15px}

/* Subscribe CTA */
.cta{background:radial-gradient(ellipse at 50% 120%,var(--tide) 0%,var(--night) 70%);text-align:center;border-top:1px solid var(--line);position:relative;overflow:hidden}
.cta .moonmark{width:70px;height:70px;margin:0 auto 26px;color:var(--gold)}
.cta h2{font-size:clamp(42px,6vw,76px);margin:14px 0 20px}
.cta p{color:var(--soft);max-width:520px;margin:0 auto 36px}
.cta .actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* Inner page hero */
.page-hero{position:relative;padding:calc(var(--header-h) + 80px) 0 80px;border-bottom:1px solid var(--line);
  background:
    radial-gradient(1px 1px at 8% 22%,#fff9 50%,transparent 51%),radial-gradient(1px 1px at 22% 68%,#fff6 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 37% 14%,#fffa 50%,transparent 51%),radial-gradient(1px 1px at 55% 40%,#fff5 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 68% 18%,#f2da9ecc 50%,transparent 51%),radial-gradient(1px 1px at 79% 62%,#fff7 50%,transparent 51%),
    radial-gradient(1px 1px at 91% 30%,#fff8 50%,transparent 51%),radial-gradient(1.5px 1.5px at 96% 78%,#fff6 50%,transparent 51%),
    radial-gradient(ellipse at 70% 0%,#173560 0%,var(--deep) 40%,var(--night) 85%)}
.page-hero h1{font-size:clamp(44px,6vw,80px);margin:16px 0 18px;max-width:780px}
.page-hero p{color:var(--soft);font-size:18px;max-width:560px}

/* About */
.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:80px;align-items:center}
.split h2{font-size:clamp(36px,4.2vw,54px);margin:14px 0 22px}
.split p{color:var(--soft)}
.split p+p{margin-top:16px}
.portrait{max-width:420px;width:100%;margin:0 auto;aspect-ratio:1;border-radius:50%;padding:6px;background:linear-gradient(135deg,var(--gold2),#9a7a3c)}
.portrait img{width:100%;height:100%;object-fit:cover;border-radius:50%;border:4px solid var(--night)}
.checks{display:grid;gap:12px;margin-top:28px}
.checks li{position:relative;padding-left:34px;color:var(--moon)}
.checks li::before{content:"";position:absolute;left:0;top:7px;width:18px;height:10px;border-left:1.5px solid var(--gold);border-bottom:1.5px solid var(--gold);transform:rotate(-45deg)}
.quote-de{margin-top:28px;padding:20px 24px;border-left:2px solid var(--gold);background:rgba(232,225,211,.04);font-style:italic;color:var(--soft)}

/* FAQ */
.faq{max-width:860px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line)}
.faq details:first-child{border-top:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:24px 48px 24px 0;font-family:var(--serif);font-weight:500;font-size:24px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:6px;top:50%;transform:translateY(-50%);color:var(--gold);font-family:var(--sans);font-weight:300;font-size:26px;transition:transform .3s}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq details p{color:var(--soft);padding:0 48px 24px 0}

/* Use cases (home) */
.uses{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.use{border:1px solid var(--line);border-radius:14px;padding:32px 28px;background:rgba(7,15,31,.4);display:flex;flex-direction:column;transition:border-color .3s}
.use:hover{border-color:rgba(212,173,98,.45)}
.use .num{font-family:var(--serif);font-style:italic;color:var(--gold);font-size:20px}
.use h3{font-size:26px;margin:4px 0 10px}
.use p{color:var(--soft);font-size:15px}
.use .best{margin-top:16px;font-size:14px}
.use .best b{display:block;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:500;margin-bottom:2px}
.use .go{margin-top:auto;align-self:flex-start;font-size:14px}
.use .best{margin-bottom:22px}

/* White noise guide (home) */
.guide-two{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}
.prose h3{font-size:clamp(28px,3vw,36px);margin:0 0 14px}
.safety-card{border:1px solid var(--line);border-radius:14px;padding:32px;background:rgba(7,15,31,.4)}
.safety-card h3{font-size:30px}
.safety-card .checks{margin-top:18px}
.safety-card .checks li{color:var(--soft)}
#videos,#uses,#guide,#colors,#choose,#safety,#faq,#faq details{scroll-margin-top:var(--header-h)}
.prose p{color:var(--soft)}
.prose p+p{margin-top:14px}
.prose strong{color:var(--moon);font-weight:500}
.noise-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.noise{border:1px solid var(--line);border-radius:14px;padding:28px;background:var(--deep)}
.noise h3{font-size:28px;margin-bottom:4px}
.noise .sounds{font-size:13px;color:var(--gold);margin-bottom:14px}
.noise p{color:var(--soft);font-size:15px}
.spectrum{height:70px;margin:6px 0 8px;background:linear-gradient(90deg,var(--gold2),rgba(212,173,98,.35))}
.spectrum.white{clip-path:polygon(0 30%,100% 30%,100% 100%,0 100%)}
.spectrum.pink{clip-path:polygon(0 8%,100% 58%,100% 100%,0 100%)}
.spectrum.brown{clip-path:polygon(0 0,35% 45%,100% 88%,100% 100%,0 100%)}
.spectrum-label{display:flex;justify-content:space-between;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--soft);margin-bottom:16px}
.table-wrap{overflow-x:auto;max-width:980px;margin:0 auto;border:1px solid var(--line);border-radius:14px}
.guide-table{width:100%;border-collapse:collapse;font-size:15px;min-width:620px}
.guide-table th{text-align:left;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:500;padding:16px 20px;background:var(--deep);border-bottom:1px solid var(--line)}
.guide-table td{padding:16px 20px;border-bottom:1px solid var(--line);color:var(--soft);vertical-align:top}
.guide-table tr:last-child td{border-bottom:0}
.guide-table td:first-child{color:var(--moon);font-weight:500}
.callout{padding:22px 26px;border-left:2px solid var(--gold);background:rgba(232,225,211,.04);color:var(--soft);font-size:15px}
.callout strong{color:var(--moon);font-weight:500}

.byline{font-size:13px;color:var(--soft);margin-top:14px}
.sources{max-width:860px;margin:50px auto 0;font-size:13px;color:var(--soft)}
.sources h3{font-family:var(--sans);font-size:11px;letter-spacing:.28em;text-transform:uppercase;color:var(--gold);font-weight:500;margin-bottom:12px}
.sources ol{padding-left:18px;display:grid;gap:6px}
.sources>p{margin-top:14px;font-style:italic}

/* Footer */
.site-footer{background:var(--deep);border-top:1px solid var(--line);font-size:14px;color:var(--soft)}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px;padding:64px 0 46px}
.foot-grid h4{font-size:11px;letter-spacing:.28em;text-transform:uppercase;color:var(--gold);font-weight:500;margin-bottom:16px}
.foot-grid ul{display:grid;gap:8px}
.foot-grid a:hover{color:var(--moon)}
.foot-grid .logo{margin-bottom:14px}
.foot-grid p{max-width:360px}
.foot-bottom{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:22px 0;border-top:1px solid var(--line);font-size:13px}

/* Reveal on scroll */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .thumb img,.play{transition:none}
}

@media (max-width:1140px){
  .uses{grid-template-columns:1fr 1fr}
}
@media (max-width:1000px){
  .vgrid{grid-template-columns:repeat(2,1fr)}
  .features{grid-template-columns:1fr 1fr}
  .uses{grid-template-columns:1fr 1fr}
  .noise-cards{grid-template-columns:1fr}
  .guide-two{grid-template-columns:1fr;gap:40px}
}
@media (max-width:860px){
  .split{grid-template-columns:1fr;gap:50px}
  .portrait{max-width:300px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-grid>div:first-child{grid-column:1/-1}
}
@media (max-width:760px){
  .nav-links,.nav-cta .btn{display:none}
  .menu-btn{display:block}
  .mobile-menu{display:flex;flex-direction:column;position:fixed;inset:0;z-index:40;background:rgba(7,15,31,.98);
    padding:calc(var(--header-h) + 30px) 24px 40px;gap:6px;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
  .mobile-menu a{font-family:var(--serif);font-size:36px;font-weight:500;padding:8px 0;border-bottom:1px solid var(--line)}
  .mobile-menu a[aria-current="page"]{color:var(--gold2)}
  .mobile-menu .btn{font-family:var(--sans);font-size:12px;font-weight:600;border-bottom:0;margin-top:28px;padding:16px}
  .menu-open .mobile-menu{opacity:1;visibility:visible}
  .menu-open{overflow:hidden}
}
@media (max-width:640px){
  :root{--header-h:72px}
  .logo{font-size:22px}
  .banner{height:auto;aspect-ratio:16/9}
  .channel{margin-top:-34px;padding-bottom:0}
  .channel-row{gap:14px 16px;align-items:center;flex-wrap:wrap}
  .avatar{width:84px;height:84px;padding:3px}
  .channel-info{min-width:0;flex:1;padding-bottom:0}
  .channel-info h1{font-size:30px}
  .channel-info .tagline{font-size:13px;line-height:1.5}
  .channel-meta{font-size:12px;gap:2px 12px;margin-top:6px}
  .channel-meta>span:last-child{display:none}
  .channel-actions{width:100%;gap:10px;padding-bottom:0}
  .channel-actions .btn{flex:1;padding:12px 10px;font-size:11px;letter-spacing:.12em}
  .videos{padding-top:24px}
  .videos-head{padding-top:22px;margin-bottom:16px}
  .chips{flex-wrap:nowrap;overflow-x:auto;margin:0 -24px 26px;padding:0 24px 4px;scrollbar-width:none}
  .chips::-webkit-scrollbar{display:none}
  .chip{flex:none}
  .vgrid{grid-template-columns:1fr;gap:34px}
  .features,.uses{grid-template-columns:1fr}
        section{padding:84px 0}
  .player-bar{flex-direction:column;align-items:stretch}
  .player-bar .actions .btn{flex:1}
  .foot-grid{grid-template-columns:1fr}
  .page-hero{padding:calc(var(--header-h) + 50px) 0 60px}
}