/* paper-chain.io Design System — Responsive Edition */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Sora:wght@600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --navy:#0d234a;--navy-light:#1a3a6e;--blue:#1f5bd8;--blue-light:#3b73e8;--blue-pale:#dfeeff;
  --teal:#00c4b4;--teal-dark:#009e90;--sky:#f5f9ff;--white:#ffffff;
  --bg:var(--sky);--surface:var(--white);--border:#e5eaf5;--muted:#6b7a99;--text:var(--navy);--text-light:#4a5878;
  --pass:#16a34a;--pass-bg:#f0fdf4;--warn:#d97706;--warn-bg:#fffbeb;--fail:#dc2626;--fail-bg:#fef2f2;--info:#0369a1;--info-bg:#f0f9ff;
  --gap-xs:4px;--gap-sm:8px;--gap-md:16px;--gap-lg:24px;--gap-xl:40px;--gap-2xl:64px;
  --r-sm:6px;--r-md:12px;--r-lg:20px;--r-pill:50px;
  --sh-sm:0 1px 3px rgba(13,35,74,.08);--sh-md:0 4px 16px rgba(13,35,74,.12);--sh-lg:0 12px 40px rgba(13,35,74,.16);
  --ff-display:'Sora',sans-serif;--ff-body:'Inter',sans-serif;--ff-mono:'JetBrains Mono',monospace;
  --header-h:68px;
  --page-px:60px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--ff-body);background:var(--bg);color:var(--text);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,select,textarea{font-family:inherit}
ul{list-style:none}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.hidden{display:none!important}

/* ── Buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--gap-sm);padding:11px 22px;border-radius:var(--r-pill);font-size:15px;font-weight:600;cursor:pointer;transition:all .18s ease;border:2px solid transparent;white-space:nowrap;text-align:center}
.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue-light);transform:translateY(-1px);box-shadow:var(--sh-md)}
.btn-secondary{background:transparent;border-color:var(--blue);color:var(--blue)}.btn-secondary:hover{background:var(--blue-pale)}
.btn-ghost{background:transparent;color:var(--muted)}.btn-ghost:hover{background:var(--border);color:var(--text)}
.btn-teal{background:var(--teal);color:#fff}.btn-teal:hover{background:var(--teal-dark);transform:translateY(-1px);box-shadow:var(--sh-md)}
.btn-danger{background:var(--fail);color:#fff}
.btn-sm{padding:7px 16px;font-size:13px}.btn-lg{padding:15px 32px;font-size:17px}.btn-full{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}

/* ── Cards ── */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:var(--gap-lg);box-shadow:var(--sh-sm)}
.card-hover{transition:box-shadow .2s,transform .2s}.card-hover:hover{box-shadow:var(--sh-md);transform:translateY(-2px)}

/* ── Badges ── */
.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:var(--r-pill);font-size:12px;font-weight:600;letter-spacing:.3px}
.badge-blue{background:var(--blue-pale);color:var(--blue)}.badge-teal{background:#e0faf8;color:var(--teal-dark)}
.badge-green{background:var(--pass-bg);color:var(--pass)}.badge-red{background:var(--fail-bg);color:var(--fail)}
.badge-amber{background:var(--warn-bg);color:var(--warn)}.badge-navy{background:var(--navy);color:#fff}

/* ── Alerts ── */
.alert{display:flex;align-items:flex-start;gap:var(--gap-md);padding:var(--gap-md);border-radius:var(--r-md);font-size:14px;line-height:1.5}
.alert-pass{background:var(--pass-bg);color:var(--pass);border:1px solid #bbf7d0}
.alert-warn{background:var(--warn-bg);color:var(--warn);border:1px solid #fde68a}
.alert-fail{background:var(--fail-bg);color:var(--fail);border:1px solid #fecaca}
.alert-info{background:var(--info-bg);color:var(--info);border:1px solid #bae6fd}

/* ── Forms ── */
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:13px;font-weight:600;color:var(--text-light);text-transform:uppercase;letter-spacing:.5px}
.input{width:100%;padding:11px 14px;border:1.5px solid var(--border);border-radius:var(--r-md);font-size:15px;color:var(--text);background:var(--surface);transition:border-color .15s,box-shadow .15s;outline:none}
.input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(31,91,216,.12)}.input.error{border-color:var(--fail)}.input::placeholder{color:var(--muted)}
select.input{appearance:none;cursor:pointer}.field-error{font-size:12px;color:var(--fail);margin-top:2px}.field-hint{font-size:12px;color:var(--muted)}
.pw-bar{height:4px;border-radius:2px;background:var(--border);margin-top:6px;overflow:hidden}.pw-bar-fill{height:100%;border-radius:2px;transition:width .3s,background .3s}

/* ── Dividers ── */
.divider{border:none;border-top:1px solid var(--border);margin:var(--gap-lg) 0}
.divider-label{display:flex;align-items:center;gap:var(--gap-md);color:var(--muted);font-size:13px;margin:var(--gap-lg) 0}
.divider-label::before,.divider-label::after{content:'';flex:1;border-top:1px solid var(--border)}

/* ── Steps ── */
.steps{display:flex;align-items:center;gap:0;margin-bottom:var(--gap-xl);overflow-x:auto;padding-bottom:4px}
.step-item{display:flex;flex-direction:column;align-items:center;flex-shrink:0}
.step-dot{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;border:2px solid var(--border);background:var(--surface);color:var(--muted);transition:all .2s}
.step-item.active .step-dot{border-color:var(--blue);background:var(--blue);color:#fff}
.step-item.done .step-dot{border-color:var(--pass);background:var(--pass);color:#fff}
.step-label{font-size:11px;color:var(--muted);margin-top:6px;text-align:center;max-width:72px;white-space:nowrap}
.step-item.active .step-label{color:var(--blue);font-weight:600}.step-item.done .step-label{color:var(--pass)}
.step-connector{flex:1;min-width:16px;height:2px;background:var(--border);margin-bottom:20px}.step-connector.done{background:var(--pass)}

/* ── Table ── */
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th{text-align:left;padding:10px 14px;font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);border-bottom:1px solid var(--border);font-weight:600}
.table td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:middle}
.table tr:last-child td{border-bottom:none}.table tr:hover td{background:var(--sky)}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.mono{font-family:var(--ff-mono);font-size:13px}.mono-sm{font-family:var(--ff-mono);font-size:11px}

/* ── Toast ── */
#toast-container{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:10px;z-index:9999;pointer-events:none;max-width:calc(100vw - 48px)}
.toast{background:var(--navy);color:#fff;padding:12px 18px;border-radius:var(--r-md);font-size:14px;box-shadow:var(--sh-lg);display:flex;align-items:center;gap:10px;pointer-events:all;width:100%;animation:slideUp .2s ease}
.toast.success{border-left:4px solid var(--teal)}.toast.error{border-left:4px solid var(--fail)}.toast.warn{border-left:4px solid var(--warn)}
@keyframes slideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

/* ── Modal ── */
#modal-overlay{position:fixed;inset:0;background:rgba(13,35,74,.5);display:flex;align-items:center;justify-content:center;z-index:9000;backdrop-filter:blur(4px);animation:fadeIn .15s ease;padding:16px}
.modal{background:var(--surface);border-radius:var(--r-lg);padding:var(--gap-xl);max-width:520px;width:100%;box-shadow:var(--sh-lg);position:relative;animation:scaleIn .2s ease;max-height:90vh;overflow-y:auto}
.modal-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--gap-lg)}
.modal-title{font-family:var(--ff-display);font-size:20px;font-weight:700}
.modal-close{width:32px;height:32px;border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:18px;cursor:pointer;flex-shrink:0}
.modal-close:hover{background:var(--border)}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes scaleIn{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}

/* ── Header ── */
#site-header{position:sticky;top:0;z-index:500;height:var(--header-h);background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 var(--page-px)}
.logo-wrap{display:flex;align-items:center;gap:10px;cursor:pointer;flex-shrink:0}
.logo-icon{font-size:24px}.logo-text{font-family:var(--ff-display);font-size:22px;font-weight:700;color:var(--blue)}
.logo-tld{color:var(--navy)}
#main-nav{display:flex;align-items:center;gap:4px}
#main-nav a{padding:8px 14px;border-radius:var(--r-sm);font-size:14px;font-weight:500;color:var(--text-light);transition:all .15s;white-space:nowrap}
#main-nav a:hover{background:var(--blue-pale);color:var(--blue)}#main-nav a.active{color:var(--blue);font-weight:600}
.nav-actions{display:flex;align-items:center;gap:var(--gap-sm);flex-shrink:0}

/* Hamburger */
.nav-hamburger{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer;border-radius:var(--r-sm)}
.nav-hamburger span{display:block;width:22px;height:2px;background:var(--navy);border-radius:2px;transition:all .2s}
.nav-hamburger.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-hamburger.open span:nth-child(2){opacity:0}
.nav-hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* Mobile nav drawer */
#mobile-nav{display:none;position:fixed;inset:0;top:var(--header-h);background:var(--surface);z-index:490;padding:var(--gap-lg);flex-direction:column;gap:4px;border-top:1px solid var(--border);overflow-y:auto}
#mobile-nav.open{display:flex}
#mobile-nav a{display:block;padding:14px 16px;border-radius:var(--r-md);font-size:16px;font-weight:500;color:var(--text);border-bottom:1px solid var(--border)}
#mobile-nav a:hover{background:var(--blue-pale);color:var(--blue)}
.mobile-nav-actions{display:flex;flex-direction:column;gap:10px;margin-top:var(--gap-lg)}

/* ── Footer ── */
#site-footer{background:var(--navy);color:rgba(255,255,255,.8);padding:var(--gap-xl) var(--page-px)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--gap-xl);max-width:1200px;margin:0 auto;padding-bottom:var(--gap-xl);border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand .logo-text{color:#fff;font-size:20px}.footer-brand p{font-size:13px;margin-top:var(--gap-md);line-height:1.7;opacity:.7}
.footer-col h4{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:rgba(255,255,255,.5);margin-bottom:var(--gap-md)}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,.7);padding:3px 0;transition:color .15s}.footer-col a:hover{color:#fff}
.footer-bottom{max-width:1200px;margin:var(--gap-lg) auto 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--gap-md);font-size:12px;opacity:.5}

/* ── App shell ── */
#app{min-height:calc(100vh - var(--header-h))}.page{display:none}.page.active{display:block}

/* ── Sidebar layout ── */
.app-layout{display:flex;min-height:calc(100vh - var(--header-h))}
.sidebar{width:240px;min-width:240px;background:var(--surface);border-right:1px solid var(--border);padding:var(--gap-lg) var(--gap-md);position:sticky;top:var(--header-h);height:calc(100vh - var(--header-h));overflow-y:auto;display:flex;flex-direction:column}
.sidebar-section{margin-bottom:var(--gap-lg)}
.sidebar-label{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);padding:0 12px;margin-bottom:var(--gap-sm)}
.sidebar a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--r-sm);font-size:14px;color:var(--text-light);font-weight:500;transition:all .15s;margin-bottom:2px}
.sidebar a:hover{background:var(--blue-pale);color:var(--blue)}.sidebar a.active{background:var(--blue-pale);color:var(--blue);font-weight:600}
.sidebar a .icon{width:18px;text-align:center;font-size:16px;flex-shrink:0}
.sidebar-footer{margin-top:auto;padding:12px}
.app-content{flex:1;padding:var(--gap-xl);overflow-x:hidden;min-width:0}
.page-title{font-family:var(--ff-display);font-size:clamp(22px,3vw,28px);font-weight:700;margin-bottom:4px}
.page-subtitle{color:var(--muted);font-size:14px;margin-bottom:var(--gap-xl)}

/* ── Drop zone ── */
.drop-zone{border:2px dashed var(--border);border-radius:var(--r-lg);padding:var(--gap-2xl) var(--gap-xl);text-align:center;cursor:pointer;transition:all .2s;background:var(--surface)}
.drop-zone:hover,.drop-zone.drag-over{border-color:var(--blue);background:var(--blue-pale)}
.drop-zone .dz-icon{font-size:48px;margin-bottom:var(--gap-md)}.drop-zone h3{font-size:18px;margin-bottom:8px}.drop-zone p{color:var(--muted);font-size:14px}

/* ── Progress ring ── */
.progress-ring{display:inline-block;position:relative}
.progress-ring svg{transform:rotate(-90deg)}
.progress-ring .ring-bg{fill:none;stroke:var(--border)}.progress-ring .ring-fill{fill:none;stroke:var(--teal);stroke-linecap:round;transition:stroke-dashoffset .6s ease}
.progress-ring .ring-label{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.progress-ring .ring-pct{font-family:var(--ff-display);font-size:28px;font-weight:700;color:var(--text)}
.progress-ring .ring-txt{font-size:11px;color:var(--muted)}

/* ── Pricing ── */
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap-lg);margin-top:var(--gap-xl)}
.pricing-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:var(--gap-xl);position:relative}
.pricing-card.popular{border-color:var(--blue);box-shadow:0 0 0 2px var(--blue)}
.pricing-popular-badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--blue);color:#fff;font-size:11px;font-weight:700;padding:3px 14px;border-radius:var(--r-pill);white-space:nowrap}
.pricing-name{font-size:13px;text-transform:uppercase;letter-spacing:1px;font-weight:700;color:var(--muted);margin-bottom:var(--gap-md)}
.pricing-price{font-family:var(--ff-display);font-size:40px;font-weight:800;color:var(--navy);line-height:1}
.pricing-period{font-size:14px;color:var(--muted)}.pricing-features{margin:var(--gap-lg) 0;display:flex;flex-direction:column;gap:10px}
.pricing-feat{display:flex;align-items:center;gap:8px;font-size:14px}
.pricing-feat .ok{color:var(--pass)}.pricing-feat .no{color:var(--border)}

/* ── Responsive grid helpers ── */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-auto{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}

/* ════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
═══════════════════════════════════════════ */

/* ── Tablet ≤ 1024px ── */
@media(max-width:1024px){
  :root{--page-px:32px}
  .pricing-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr 1fr}
}

/* ── Small tablet ≤ 900px ── */
@media(max-width:900px){
  :root{--page-px:24px}
  #main-nav{display:none}
  .nav-hamburger{display:flex}
  .nav-actions .btn-ghost{display:none} /* hide login, show in mobile menu */

  /* Sidebar becomes horizontal tab strip */
  .app-layout{flex-direction:column}
  .sidebar{width:100%;min-width:unset;position:static;height:auto;border-right:none;border-bottom:1px solid var(--border);flex-direction:row;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;gap:4px;padding:10px 16px;-webkit-overflow-scrolling:touch}
  .sidebar-section{display:flex;gap:4px;flex-shrink:0;margin-bottom:0}
  .sidebar-label{display:none}
  .sidebar a{white-space:nowrap;flex-direction:row;gap:6px;padding:8px 14px;font-size:13px}
  .sidebar a .icon{width:auto}
  .sidebar-footer{display:none}
  .app-content{padding:var(--gap-lg)}

  #site-footer{padding:var(--gap-xl) var(--page-px)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:var(--gap-lg)}
}

/* ── Mobile ≤ 640px ── */
@media(max-width:640px){
  :root{--page-px:16px;--gap-xl:28px}
  #site-header{padding:0 16px}

  .grid-2{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .pricing-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center;gap:12px}

  .btn-lg{padding:13px 24px;font-size:16px}
  .logo-text{font-size:18px}

  .modal{padding:var(--gap-lg)}
  .drop-zone{padding:var(--gap-xl) var(--gap-md)}

  /* Table horizontal scroll on mobile */
  .table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .table{min-width:600px}

  /* Steps: smaller on mobile */
  .steps{gap:0}
  .step-dot{width:30px;height:30px;font-size:11px}
  .step-label{font-size:10px;max-width:56px}
  .step-connector{min-width:10px}

  /* App content */
  .app-content{padding:var(--gap-md)}
  .page-title{font-size:22px}
}

/* ── Very small ≤ 380px ── */
@media(max-width:380px){
  :root{--page-px:12px}
  .btn{padding:10px 16px;font-size:14px}
  .pricing-price{font-size:32px}
}

/* ── Additional responsive fixes ── */
/* Settings / upload two-column form inputs */
@media(max-width:640px){
  .grid-2{grid-template-columns:1fr!important}
  /* Make LC amount+currency stay side by side even on mobile */
  .grid-2-sm{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  /* Upload page: stack the two panels */
  .upload-grid{display:grid;grid-template-columns:1fr;gap:20px}
  /* Payment history table scroll */
  .payment-table{overflow-x:auto}
  /* Verify page stack */
  .verify-grid{display:grid;grid-template-columns:1fr;gap:20px}
}
@media(min-width:641px){
  .upload-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
  .verify-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
}