/*
 * SellerTools — Shared Design System
 * ====================================
 * Fonts: Syne (headings) · DM Sans (body) · JetBrains Mono (numbers)
 * All pages link this file AND have page-specific inline <style> blocks.
 * This file provides shared tokens, reset, nav, buttons, footer & utilities.
 */

/* ============================================================
   CSS CUSTOM PROPERTIES — Design Tokens
   ============================================================ */
:root {
  /* Backgrounds */
  --bg0: #05080f; --bg1: #090e1a; --bg2: #0d1525; --bg3: #111d30; --bg4: #16243d;

  /* Accent: Blue */
  --blue: #3b82f6; --blue-lt: #60a5fa; --blue-dim: rgba(59,130,246,.12); --blue-ring: rgba(59,130,246,.32);

  /* Semantic colours */
  --green: #22c55e;   --green-dim: rgba(34,197,94,.11);
  --amber: #f59e0b;   --amber-dim: rgba(245,158,11,.11);
  --red:   #ef4444;   --red-dim:   rgba(239,68,68,.11);
  --purple:#a855f7;   --purple-dim:rgba(168,85,247,.11);

  /* Text */
  --t1:#eef3fc; --t2:#a8bcda; --t3:#6e8db0; --t4:#445e7c;

  /* Borders */
  --border:rgba(255,255,255,.08); --border-md:rgba(255,255,255,.14); --border-b:rgba(59,130,246,.32);

  /* Typography */
  --font-display:'Syne',system-ui,sans-serif;
  --font-body:'DM Sans',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;

  /* Border radii */
  --radius-sm:8px; --radius-md:12px; --radius-lg:16px;
  --radius-xl:22px; --radius-2xl:30px; --radius-pill:9999px;

  /* Shadows */
  --shadow-sm:0 1px 4px rgba(0,0,0,.55);
  --shadow-md:0 4px 24px rgba(0,0,0,.5);
  --shadow-lg:0 10px 48px rgba(0,0,0,.6);
  --shadow-blue:0 0 0 1px rgba(59,130,246,.25),0 8px 36px rgba(59,130,246,.12);
  --shadow-card:0 2px 16px rgba(0,0,0,.35),0 0 0 1px rgba(255,255,255,.04);

  /* Motion */
  --ease:cubic-bezier(.16,1,.3,1); --dur-fast:130ms; --dur-mid:220ms; --dur-slow:360ms;

  /* Layout */
  --max-w:1120px;
}

/* ============================================================ RESET */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;font-size:16px;}
body{font-family:var(--font-body);font-size:15px;line-height:1.65;color:var(--t1);background-color:var(--bg0);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;min-height:100vh;}
a{color:inherit;text-decoration:none;}
ul,ol,li{list-style:none;margin:0;padding:0;}
img,svg{display:block;max-width:100%;}
button{cursor:pointer;font-family:var(--font-body);border:none;background:none;}
h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;line-height:1.14;letter-spacing:-.022em;color:var(--t1);}
p{margin:0;}
::-webkit-scrollbar{width:5px;}
::-webkit-scrollbar-track{background:var(--bg0);}
::-webkit-scrollbar-thumb{background:var(--bg3);border-radius:5px;}

/* ============================================================ PAGE BACKGROUND */
.page-bg{position:fixed;inset:0;z-index:0;pointer-events:none;background:var(--bg0);overflow:hidden;}
.page-bg-orb{position:absolute;top:-220px;left:50%;transform:translateX(-50%);width:1100px;height:800px;background:radial-gradient(ellipse 60% 60% at 50% 40%,rgba(59,130,246,.12) 0%,rgba(59,130,246,.04) 45%,transparent 70%);animation:orb-breathe 9s ease-in-out infinite;}
@keyframes orb-breathe{0%,100%{transform:translateX(-50%) scale(1);opacity:1;}50%{transform:translateX(-50%) scale(1.08);opacity:.7;}}
.page-bg-grid{position:absolute;inset:0;background-image:radial-gradient(circle,rgba(255,255,255,.035) 1px,transparent 1px);background-size:30px 30px;-webkit-mask-image:radial-gradient(ellipse 80% 55% at 50% 0%,black,transparent);mask-image:radial-gradient(ellipse 80% 55% at 50% 0%,black,transparent);}
.page-content{position:relative;z-index:1;display:flex;flex-direction:column;min-height:100vh;}

/* ============================================================ LAYOUT */
.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px;}

/* ============================================================ NAV */
.nav{position:sticky;top:0;z-index:100;height:60px;flex-shrink:0;}
.nav-backdrop{position:absolute;inset:0;background:rgba(5,8,15,.85);backdrop-filter:blur(20px) saturate(160%);-webkit-backdrop-filter:blur(20px) saturate(160%);border-bottom:1px solid var(--border);}
.nav-backdrop::after{content:'';position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent 0%,rgba(59,130,246,.20) 30%,rgba(59,130,246,.20) 70%,transparent 100%);}
.nav-inner{position:relative;z-index:1;height:60px;max-width:var(--max-w);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:24px;}
.nav-logo{display:flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;}
.nav-logo-mark{width:30px;height:30px;border-radius:var(--radius-sm);background:linear-gradient(135deg,#1e6fd4 0%,#3b82f6 100%);display:flex;align-items:center;justify-content:center;box-shadow:0 0 16px rgba(59,130,246,.35);flex-shrink:0;}
.nav-logo-mark svg{width:15px;height:15px;}
.nav-logo-text{font-family:var(--font-display);font-size:16px;font-weight:700;letter-spacing:-.025em;color:var(--t1);}
.nav-logo-text span{color:var(--blue-lt);}
.nav-links{display:flex;align-items:center;gap:2px;list-style:none;flex:1;justify-content:center;}
.nav-links li{list-style:none;}
.nav-link{display:inline-block;padding:6px 14px;font-size:14px;font-weight:500;color:var(--t3);border-radius:var(--radius-sm);text-decoration:none;transition:color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease);}
.nav-link:hover{color:var(--t1);background:rgba(255,255,255,.05);}
.nav-link.active{color:var(--t1);background:rgba(255,255,255,.06);}
.nav-right{display:flex;align-items:center;gap:12px;}
.nav-badge{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:500;color:var(--t3);padding:5px 12px;border-radius:var(--radius-pill);border:1px solid var(--border);white-space:nowrap;}
.nav-badge-dot{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 6px rgba(34,197,94,.6);flex-shrink:0;animation:dot-blink 2.5s ease infinite;}
@keyframes dot-blink{0%,100%{opacity:1;}50%{opacity:.4;}}
.nav-hamburger{display:none;width:36px;height:36px;align-items:center;justify-content:center;border-radius:var(--radius-sm);border:1px solid var(--border-md);color:var(--t2);background:none;cursor:pointer;transition:border-color var(--dur-fast),color var(--dur-fast);}
.nav-hamburger:hover{border-color:var(--border-b);color:var(--t1);}
.nav-drawer{display:none;position:fixed;top:60px;left:0;right:0;z-index:99;background:rgba(5,8,15,.97);border-bottom:1px solid var(--border);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);padding:12px 16px 20px;flex-direction:column;gap:4px;}
.nav-drawer.open{display:flex;}
.nav-drawer-link{display:block;padding:11px 14px;font-size:15px;font-weight:500;color:var(--t2);border-radius:var(--radius-sm);text-decoration:none;transition:color var(--dur-fast),background var(--dur-fast);}
.nav-drawer-link:hover{color:var(--t1);background:rgba(255,255,255,.04);}

/* ============================================================ BUTTONS */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:42px;padding:0 22px;border-radius:var(--radius-md);font-family:var(--font-body);font-size:14px;font-weight:600;letter-spacing:-.005em;border:1px solid transparent;cursor:pointer;text-decoration:none;white-space:nowrap;transition:all var(--dur-mid) var(--ease);}
.btn-primary{background:var(--blue);color:#fff;border-color:var(--blue);box-shadow:0 0 22px rgba(59,130,246,.25),inset 0 1px 0 rgba(255,255,255,.14);}
.btn-primary:hover{background:#4f93f8;border-color:#4f93f8;box-shadow:0 0 40px rgba(59,130,246,.4),inset 0 1px 0 rgba(255,255,255,.14);transform:translateY(-1px);}
.btn-primary:active{transform:none;}
.btn-outline{background:transparent;color:var(--t2);border-color:var(--border-md);}
.btn-outline:hover{color:var(--t1);border-color:var(--border-b);background:var(--blue-dim);}
.btn-lg{height:50px;padding:0 30px;font-size:15px;border-radius:var(--radius-lg);}

/* ============================================================ BADGES */
.badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:3px 10px;border-radius:var(--radius-pill);border:1px solid transparent;}
.badge-green{color:var(--green);background:var(--green-dim);border-color:rgba(34,197,94,.22);}
.badge-amber{color:var(--amber);background:var(--amber-dim);border-color:rgba(245,158,11,.22);}
.badge-blue{color:var(--blue-lt);background:var(--blue-dim);border-color:var(--border-b);}
.badge-purple{color:var(--purple);background:var(--purple-dim);border-color:rgba(168,85,247,.28);}
.eyebrow{display:block;font-family:var(--font-body);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--blue-lt);margin-bottom:14px;}

/* ============================================================ FOOTER */
.footer{border-top:1px solid var(--border);padding:64px 0 40px;margin-top:auto;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;padding-bottom:48px;border-bottom:1px solid var(--border);margin-bottom:24px;}
.footer-brand-desc{font-size:13px;color:var(--t4);line-height:1.7;margin-top:12px;max-width:240px;}
.footer-col-title{font-family:var(--font-body);font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--t3);margin-bottom:16px;display:block;}
.footer-links{display:flex;flex-direction:column;gap:11px;}
.footer-links li{list-style:none;}
.footer-links a{font-size:13px;color:var(--t4);text-decoration:none;transition:color var(--dur-fast);}
.footer-links a:hover{color:var(--t2);}
.footer-muted{font-size:13px;color:var(--t4);}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--t4);}
.footer-bottom-links{display:flex;gap:24px;}
.footer-bottom-links li{list-style:none;}
.footer-bottom-links a{font-size:12px;color:var(--t4);text-decoration:none;transition:color var(--dur-fast);}
.footer-bottom-links a:hover{color:var(--t3);}

/* ============================================================ UTILITIES */
.divider{border:none;height:1px;background:linear-gradient(90deg,transparent,var(--border-md) 30%,var(--border-md) 70%,transparent);}

/* ============================================================ ANIMATIONS */
@keyframes rise{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:none;}}

/* ============================================================ RESPONSIVE */
@media(max-width:768px){
  .nav-links{display:none;}
  .nav-hamburger{display:flex;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-brand-desc{max-width:100%;}
}
@media(max-width:480px){
  .container{padding:0 16px;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;gap:12px;text-align:center;}
  .footer-bottom-links{justify-content:center;flex-wrap:wrap;gap:12px 20px;}
}