/* NEXA v30 — monochrome studio, scalable from mobile to 4K displays */
:root{--nexa-accent:#171717;--nexa-accent-2:#777;--nexa-ink:#111;--nexa-paper:#f4f4f2;--nexa-line:#d8d8d5;--blue:#171717;--navy:#080808;--bg:#f4f4f2;--ink:#111;--line:#d8d8d5;--pale:#e9e9e6;--nexa-scale:1}
html{font-size:clamp(14px,calc(13px + .18vw),19px);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
body{background:var(--bg);color:var(--ink);font-family:Inter,"DM Sans",system-ui,sans-serif}
.splash{background:radial-gradient(ellipse at 50% 38%,#353535 0%,#101010 48%,#050505 100%);filter:grayscale(1)}
.splash-logo,.brand-mark{filter:grayscale(1);box-shadow:0 10px 34px #0002}
.topbar,.sidebar,.mobile-nav,.tool-card,.feature,.chat-card,.ai-card,.nexa-access-panel{border-color:var(--line);box-shadow:0 10px 32px #0000000a}
.primary,.white-btn,.secondary{filter:grayscale(1);background:#111;color:#fff;border:1px solid #111}
.feature:hover,.tool-card:hover,.device-stat:hover,.showcase-card:hover{box-shadow:0 18px 44px #00000014;border-color:#777}
.story-bubble img,.story-add{filter:grayscale(1)}
img,video,canvas{max-width:100%;height:auto}
@media(min-width:1800px){.app{max-width:1920px;margin-inline:auto}.layout{max-width:1840px;margin-inline:auto}.main{padding:clamp(28px,2.2vw,48px)}.feature-grid,.tools-grid{gap:clamp(16px,1.1vw,26px)}.feature,.tool-card{border-radius:clamp(18px,1.2vw,26px)}}
@media(min-resolution:2dppx){body{-webkit-font-smoothing:antialiased}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

/* NEXA global authentication gate + strict monochrome identity */
.auth-gate{position:fixed;inset:0;z-index:10000;display:grid;place-items:center;overflow:auto;padding:24px;background:radial-gradient(ellipse at 50% 0%,#303030 0,#111 48%,#050505 100%);color:#f7f7f7}.auth-gate[hidden]{display:none!important}.auth-shell{width:min(100%,440px);padding:clamp(24px,6vw,42px);border:1px solid #444;border-radius:28px;background:#111e;box-shadow:0 28px 90px #0009;backdrop-filter:blur(18px)}.auth-brand{display:flex;align-items:center;gap:13px;margin-bottom:34px;font-size:22px;font-weight:900;letter-spacing:.12em}.auth-brand img{width:54px;height:54px;filter:grayscale(1);border-radius:14px}.auth-brand small{display:block;margin-top:3px;color:#aaa;font-size:9px;letter-spacing:.18em}.auth-copy h1{margin:8px 0;font-size:clamp(30px,8vw,40px);letter-spacing:-.05em}.auth-copy>p:last-child{color:#aaa;line-height:1.65}.auth-form{display:grid;gap:10px;margin-top:28px}.auth-form label{margin-top:8px;color:#ddd;font-size:13px;font-weight:700}.auth-form input{width:100%;min-height:52px;padding:0 15px;border:1px solid #454545;border-radius:13px;background:#202020;color:#fff;font:inherit;outline:none}.auth-form input:focus{border-color:#fff;box-shadow:0 0 0 3px #fff2}.auth-submit{min-height:52px;margin-top:12px;border:1px solid #fff;border-radius:13px;background:#fff;color:#111;font:inherit;font-weight:900;cursor:pointer;transition:transform .18s,opacity .18s}.auth-submit:active{transform:scale(.98)}.auth-submit:disabled{opacity:.55;cursor:wait}.auth-error{min-height:20px;margin:0;color:#ffb4b4;font-size:13px}.auth-switch{margin:18px 0 0;color:#aaa;text-align:center;font-size:13px}.auth-switch button{border:0;background:none;color:#fff;text-decoration:underline;font:inherit;font-weight:800;cursor:pointer}.auth-privacy{margin:22px 0 0;color:#777;font-size:11px;line-height:1.6;text-align:center}.brand-mark img,.nexa-gram-head img{filter:grayscale(1)!important}.brand-mark img{object-fit:contain}