/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root{
  --blue-600:#1447E6;
  --blue-500:#2F6FED;
  --violet-500:#7C4DFF;
  --ink-900:#0B1730;
  --ink-700:#33415C;
  --paper-0:#FFFFFF;
  --paper-50:#F5F8FF;
  --paper-100:#E9F0FF;
  --line:rgba(20,71,230,0.14);
  --danger:#E11D48;
  --danger-soft:#FDE7EC;
  --success:#16A34A;
  --success-soft:#E4F8EC;
  --glass-bg:rgba(255,255,255,0.62);
  --glass-border:rgba(255,255,255,0.55);
  --shadow-sm:0 2px 8px rgba(20,71,230,0.08);
  --shadow-md:0 12px 30px -10px rgba(20,71,230,0.25);
  --shadow-lg:0 24px 60px -16px rgba(11,23,48,0.35);
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:9px;
  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'JetBrains Mono', monospace;
  --bg-grad: radial-gradient(1200px 600px at 10% -10%, #E4ECFF 0%, transparent 60%),
             radial-gradient(1000px 500px at 110% 10%, #EDE7FF 0%, transparent 55%),
             linear-gradient(180deg, #FAFCFF 0%, #F3F6FF 100%);
  color-scheme: light;
}
[data-theme="dark"]{
  --blue-600:#3D6BFF;
  --blue-500:#5B8CFF;
  --violet-500:#9A7BFF;
  --ink-900:#EAF0FF;
  --ink-700:#B9C6E8;
  --paper-0:#111A33;
  --paper-50:#0E1730;
  --paper-100:#16213F;
  --line:rgba(120,150,255,0.18);
  --danger:#FB7185;
  --danger-soft:#3A1622;
  --success:#4ADE80;
  --success-soft:#123420;
  --glass-bg:rgba(17,26,51,0.62);
  --glass-border:rgba(120,150,255,0.18);
  --shadow-sm:0 2px 8px rgba(0,0,0,0.3);
  --shadow-md:0 12px 30px -10px rgba(0,0,0,0.5);
  --shadow-lg:0 24px 60px -16px rgba(0,0,0,0.6);
  --bg-grad: radial-gradient(1200px 600px at 10% -10%, #16213F 0%, transparent 60%),
             radial-gradient(1000px 500px at 110% 10%, #1B1740 0%, transparent 55%),
             linear-gradient(180deg, #0A1226 0%, #0B1730 100%);
  color-scheme: dark;
}

*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font-body);
  background:var(--bg-grad);
  color:var(--ink-900);
  min-height:100vh;
  transition:background .4s ease, color .3s ease;
  -webkit-font-smoothing:antialiased;
}
img,canvas{display:block; max-width:100%;}
button{font-family:inherit; cursor:pointer;}
a{color:inherit;}
:focus-visible{outline:2px solid var(--blue-500); outline-offset:2px; border-radius:4px;}
.visually-hidden{position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap;}
.container{max-width:1180px; margin:0 auto; padding:0 20px;}

/* ============================================================
   TOP NAV
   ============================================================ */
.topbar{
  position:sticky; top:0; z-index:60;
  backdrop-filter:blur(14px);
  background:var(--glass-bg);
  border-bottom:1px solid var(--glass-border);
}
.topbar-inner{display:flex; align-items:center; justify-content:space-between; padding:14px 20px;}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; font-size:19px; letter-spacing:-.02em;}
.brand-mark{width:34px; height:34px; border-radius:10px; background:linear-gradient(135deg,var(--blue-500),var(--violet-500)); display:flex; align-items:center; justify-content:center; box-shadow:var(--shadow-sm);}
.brand-mark svg{width:19px; height:19px;}
.brand small{display:block; font-family:var(--font-body); font-weight:500; font-size:11px; color:var(--ink-700); letter-spacing:0;}
.nav-actions{display:flex; align-items:center; gap:10px;}
.icon-btn{
  width:40px; height:40px; border-radius:12px; border:1px solid var(--line);
  background:var(--paper-0); display:flex; align-items:center; justify-content:center;
  color:var(--ink-900); transition:transform .15s ease, box-shadow .15s ease;
}
.icon-btn:hover{transform:translateY(-1px); box-shadow:var(--shadow-sm);}
.icon-btn svg{width:19px; height:19px;}

/* ============================================================
   HERO
   ============================================================ */
.hero{padding:56px 0 28px;}
.hero-grid{display:grid; grid-template-columns:1.05fr .95fr; gap:44px; align-items:center;}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px; font-size:12.5px; font-weight:600;
  letter-spacing:.06em; text-transform:uppercase; color:var(--blue-600);
  background:var(--paper-100); padding:7px 14px; border-radius:99px; border:1px solid var(--line);
}
.eyebrow .dot{width:6px; height:6px; border-radius:50%; background:var(--success); box-shadow:0 0 0 3px var(--success-soft);}
h1{
  font-family:var(--font-display); font-weight:700; letter-spacing:-.03em;
  font-size:clamp(32px,4.6vw,52px); line-height:1.06; margin:18px 0 16px;
}
h1 em{font-style:normal; background:linear-gradient(100deg,var(--blue-600),var(--violet-500)); -webkit-background-clip:text; background-clip:text; color:transparent;}
.hero-sub{font-size:17px; line-height:1.6; color:var(--ink-700); max-width:52ch; margin-bottom:26px;}
.hero-cta{display:flex; flex-wrap:wrap; gap:12px; margin-bottom:22px;}
.hero-points{display:flex; flex-wrap:wrap; gap:18px; font-size:13.5px; color:var(--ink-700);}
.hero-points span{display:flex; align-items:center; gap:6px;}
.hero-points svg{width:15px; height:15px; color:var(--success); flex-shrink:0;}

.btn{
  display:inline-flex; align-items:center; gap:9px; border:none; border-radius:13px;
  padding:14px 22px; font-weight:600; font-size:15px; transition:transform .15s ease, box-shadow .2s ease, opacity .15s ease;
}
.btn:active{transform:scale(.97);}
.btn-primary{
  color:#fff; background:linear-gradient(135deg,var(--blue-500),var(--violet-500)); box-shadow:var(--shadow-md);
}
.btn-primary:hover{box-shadow:0 16px 34px -10px rgba(20,71,230,.4); transform:translateY(-1px);}
.btn-ghost{background:var(--paper-0); border:1px solid var(--line); color:var(--ink-900);}
.btn-ghost:hover{box-shadow:var(--shadow-sm); transform:translateY(-1px);}
.btn-danger{background:var(--danger); color:#fff;}
.btn-danger:hover{box-shadow:0 12px 26px -8px rgba(225,29,72,.45);}
.btn-sm{padding:9px 14px; font-size:13px; border-radius:10px;}
.btn:disabled{opacity:.45; cursor:not-allowed; transform:none; box-shadow:none;}
.btn svg{width:17px; height:17px; flex-shrink:0;}

/* ============================================================
   HERO VISUAL / SIGNATURE ELEMENT (stacked page deck)
   ============================================================ */
.deck{position:relative; height:380px; display:flex; align-items:center; justify-content:center;}
.deck-card{
  position:absolute; width:210px; height:280px; border-radius:16px; background:var(--paper-0);
  border:1px solid var(--line); box-shadow:var(--shadow-lg); padding:18px;
  display:flex; flex-direction:column; gap:7px;
}
.deck-card .ln{height:7px; border-radius:5px; background:var(--paper-100);}
.deck-card .ln.w60{width:60%;} .deck-card .ln.w80{width:80%;} .deck-card .ln.w40{width:40%;}
.deck-card:nth-child(1){transform:rotate(-9deg) translate(-70px,10px); z-index:1; opacity:.75;}
.deck-card:nth-child(2){transform:rotate(6deg) translate(64px,-6px); z-index:2; opacity:.9;}
.deck-card:nth-child(3){
  z-index:3; border:2px solid var(--danger); animation:pulseCard 2.4s ease-in-out infinite;
}
.deck-card:nth-child(3)::after{
  content:''; position:absolute; top:-1px; right:-1px; width:46px; height:46px;
  background:var(--danger); clip-path:polygon(100% 0,0 0,100% 100%); border-radius:0 16px 0 0;
}
.deck-card:nth-child(3)::before{
  content:'✕'; position:absolute; top:5px; right:6px; color:#fff; font-size:13px; font-weight:700; z-index:4;
}
@keyframes pulseCard{0%,100%{box-shadow:0 18px 40px -12px rgba(225,29,72,.35);}50%{box-shadow:0 22px 50px -10px rgba(225,29,72,.55);}}
.deck-badge{
  position:absolute; bottom:8px; left:50%; transform:translateX(-50%); background:var(--ink-900); color:var(--paper-0);
  font-family:var(--font-mono); font-size:11.5px; padding:7px 14px; border-radius:99px; box-shadow:var(--shadow-md); white-space:nowrap;
}

/* ============================================================
   WORKSPACE
   ============================================================ */
.workspace{padding:20px 0 70px;}
.card{
  background:var(--glass-bg); border:1px solid var(--glass-border); border-radius:var(--radius-lg);
  backdrop-filter:blur(16px); box-shadow:var(--shadow-sm);
}
.dropzone{
  padding:56px 24px; text-align:center; border:2px dashed var(--line); border-radius:var(--radius-lg);
  transition:border-color .2s ease, background .2s ease, transform .15s ease;
}
.dropzone.dragover{border-color:var(--blue-500); background:var(--paper-100); transform:scale(1.005);}
.dropzone-icon{
  width:64px; height:64px; margin:0 auto 18px; border-radius:16px; display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg,var(--blue-500),var(--violet-500)); box-shadow:var(--shadow-md);
}
.dropzone-icon svg{width:30px; height:30px; color:#fff;}
.dropzone h2{font-family:var(--font-display); font-size:22px; margin-bottom:8px;}
.dropzone p{color:var(--ink-700); font-size:14.5px; margin-bottom:20px;}
.dropzone input[type=file]{display:none;}

/* toolbar */
.toolbar{
  display:flex; flex-wrap:wrap; align-items:center; gap:10px; padding:16px 18px; margin-bottom:16px;
}
.toolbar .grow{flex:1;}
.stat{
  display:flex; flex-direction:column; gap:2px; font-family:var(--font-mono); font-size:12px; color:var(--ink-700);
  padding:8px 14px; border-radius:10px; background:var(--paper-100); border:1px solid var(--line);
}
.stat b{font-size:16px; color:var(--ink-900); font-family:var(--font-display);}
.range-input{
  display:flex; align-items:center; gap:6px; background:var(--paper-0); border:1px solid var(--line);
  border-radius:10px; padding:6px 8px;
}
.range-input input{
  width:52px; border:none; background:transparent; font-family:var(--font-mono); font-size:13px; color:var(--ink-900); text-align:center;
}
.range-input input:focus{outline:none;}
.divider-v{width:1px; align-self:stretch; background:var(--line);}

/* thumbnail grid */
#pageGrid{
  display:grid; grid-template-columns:repeat(auto-fill,minmax(150px,1fr)); gap:16px; padding:6px 18px 18px;
}
.page-card{
  position:relative; border-radius:var(--radius-md); background:var(--paper-0); border:2px solid transparent;
  box-shadow:var(--shadow-sm); overflow:hidden; cursor:grab; transition:transform .15s ease, box-shadow .2s ease, border-color .2s ease, opacity .2s ease;
  touch-action:none;
}
.page-card:hover{transform:translateY(-3px); box-shadow:var(--shadow-md);}
.page-card.selected{border-color:var(--danger);}
.page-card.selected .page-thumb{filter:grayscale(.3) brightness(.85);}
.page-card.dragging{opacity:.4;}
.page-card.drop-target{border-color:var(--blue-500);}
.page-thumb-wrap{position:relative; aspect-ratio:3/4; background:var(--paper-100); display:flex; align-items:center; justify-content:center; overflow:hidden;}
.page-thumb{width:100%; height:100%; object-fit:contain; transition:transform .2s ease;}
.page-check{
  position:absolute; top:8px; left:8px; width:24px; height:24px; border-radius:7px; border:2px solid rgba(255,255,255,.85);
  background:rgba(17,26,51,.35); backdrop-filter:blur(4px); display:flex; align-items:center; justify-content:center; z-index:2;
}
.page-card.selected .page-check{background:var(--danger); border-color:var(--danger);}
.page-check svg{width:14px; height:14px; color:#fff; opacity:0; transition:opacity .12s ease;}
.page-card.selected .page-check svg{opacity:1;}
.page-num{
  position:absolute; bottom:8px; left:8px; font-family:var(--font-mono); font-size:11px; background:rgba(17,26,51,.55);
  color:#fff; padding:2px 8px; border-radius:99px; backdrop-filter:blur(4px); z-index:2;
}
.page-strike{
  position:absolute; inset:0; z-index:1; display:none; align-items:center; justify-content:center;
}
.page-card.selected .page-strike{display:flex;}
.page-strike::before{content:''; position:absolute; inset:0; background:var(--danger-soft); opacity:.55;}
.page-tools{position:absolute; top:8px; right:8px; display:flex; gap:5px; z-index:2; opacity:0; transition:opacity .15s ease;}
.page-card:hover .page-tools{opacity:1;}
.page-tool-btn{
  width:24px; height:24px; border-radius:7px; background:rgba(17,26,51,.55); backdrop-filter:blur(4px); border:none;
  display:flex; align-items:center; justify-content:center; color:#fff;
}
.page-tool-btn svg{width:13px; height:13px;}
.drag-handle{
  position:absolute; bottom:8px; right:8px; width:24px; height:24px; border-radius:7px; z-index:2;
  background:rgba(17,26,51,.4); backdrop-filter:blur(4px); display:flex; align-items:center; justify-content:center; color:#fff; cursor:grab;
}
.drag-handle svg{width:13px; height:13px;}

/* progress + toasts */
.progress-wrap{padding:0 18px 14px;}
.progress-track{height:8px; border-radius:99px; background:var(--paper-100); overflow:hidden;}
.progress-fill{height:100%; width:0%; border-radius:99px; background:linear-gradient(90deg,var(--blue-500),var(--violet-500)); transition:width .25s ease;}
.progress-label{font-size:12px; color:var(--ink-700); margin-top:6px; font-family:var(--font-mono);}

.toast-stack{position:fixed; bottom:20px; right:20px; z-index:200; display:flex; flex-direction:column; gap:10px; max-width:min(340px,90vw);}
.toast{
  display:flex; align-items:flex-start; gap:10px; padding:13px 15px; border-radius:12px; background:var(--paper-0);
  border:1px solid var(--line); box-shadow:var(--shadow-md); font-size:13.5px; animation:toastIn .25s ease;
}
@keyframes toastIn{from{transform:translateY(10px); opacity:0;} to{transform:translateY(0); opacity:1;}}
.toast.error{border-color:rgba(225,29,72,.4);}
.toast.success{border-color:rgba(22,163,74,.4);}
.toast-icon{width:20px; height:20px; flex-shrink:0;}
.toast.error .toast-icon{color:var(--danger);}
.toast.success .toast-icon{color:var(--success);}

/* empty / loading states */
.center-state{padding:60px 20px; text-align:center;}
.spinner{
  width:44px; height:44px; border-radius:50%; border:3px solid var(--paper-100); border-top-color:var(--blue-500);
  margin:0 auto 16px; animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}
.success-check{
  width:60px; height:60px; border-radius:50%; background:var(--success-soft); display:flex; align-items:center;
  justify-content:center; margin:0 auto 14px; animation:pop .35s ease;
}
.success-check svg{width:28px; height:28px; color:var(--success);}
@keyframes pop{0%{transform:scale(.6); opacity:0;}70%{transform:scale(1.08);}100%{transform:scale(1); opacity:1;}}

/* export panel */
.export-row{display:flex; flex-wrap:wrap; gap:14px; align-items:center; padding:18px; border-top:1px solid var(--line); margin-top:6px;}
.field{display:flex; flex-direction:column; gap:6px; font-size:12.5px; color:var(--ink-700); font-weight:600;}
.field input[type=text], .field select{
  border:1px solid var(--line); background:var(--paper-0); border-radius:10px; padding:10px 12px; font-size:13.5px; color:var(--ink-900); font-family:var(--font-body);
}

/* modal (zoom) */
.modal-backdrop{
  position:fixed; inset:0; background:rgba(6,10,24,.6); backdrop-filter:blur(3px); z-index:300; display:none;
  align-items:center; justify-content:center; padding:24px;
}
.modal-backdrop.open{display:flex;}
.modal{
  background:var(--paper-0); border-radius:var(--radius-lg); max-width:560px; width:100%; max-height:88vh; overflow:auto;
  box-shadow:var(--shadow-lg); padding:20px;
}
.modal-head{display:flex; justify-content:space-between; align-items:center; margin-bottom:12px;}
.modal img,.modal canvas{width:100%; border-radius:10px; border:1px solid var(--line);}

/* how it works / faq / info sections */
.section{padding:64px 0;}
.section-head{max-width:640px; margin:0 auto 40px; text-align:center;}
.section-head .eyebrow{margin-bottom:14px;}
.section-head h2{font-family:var(--font-display); font-size:clamp(26px,3.4vw,36px); letter-spacing:-.02em; margin-bottom:10px;}
.section-head p{color:var(--ink-700); font-size:15.5px;}

.steps{display:grid; grid-template-columns:repeat(3,1fr); gap:18px;}
.step-card{padding:24px 22px; border-radius:var(--radius-md);}
.step-num{font-family:var(--font-mono); font-size:12px; color:var(--blue-600); font-weight:600; margin-bottom:12px;}
.step-card h3{font-family:var(--font-display); font-size:17px; margin-bottom:8px;}
.step-card p{font-size:14px; color:var(--ink-700); line-height:1.55;}

.features-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:14px;}
.feature-card{padding:20px; border-radius:var(--radius-md); text-align:left;}
.feature-card svg{width:22px; height:22px; color:var(--blue-600); margin-bottom:10px;}
.feature-card h4{font-size:14.5px; margin-bottom:5px; font-family:var(--font-display);}
.feature-card p{font-size:12.5px; color:var(--ink-700); line-height:1.5;}

.faq-list{max-width:760px; margin:0 auto; display:flex; flex-direction:column; gap:10px;}
.faq-item{border-radius:var(--radius-md); overflow:hidden;}
.faq-q{
  width:100%; display:flex; justify-content:space-between; align-items:center; gap:14px; padding:18px 20px;
  background:transparent; border:none; text-align:left; font-family:var(--font-display); font-size:15.5px; color:var(--ink-900);
}
.faq-q svg{width:18px; height:18px; flex-shrink:0; transition:transform .2s ease; color:var(--blue-600);}
.faq-item.open .faq-q svg{transform:rotate(45deg);}
.faq-a{max-height:0; overflow:hidden; transition:max-height .25s ease;}
.faq-a p{padding:0 20px 18px; font-size:14px; color:var(--ink-700); line-height:1.6;}

footer{padding:34px 0 50px; text-align:center; color:var(--ink-700); font-size:13px;}
footer a{color:var(--blue-600); font-weight:600; text-decoration:none;}
.kbd{font-family:var(--font-mono); background:var(--paper-100); border:1px solid var(--line); border-radius:6px; padding:1px 7px; font-size:11.5px;}

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .deck{height:260px; order:-1;}
  .steps{grid-template-columns:1fr;}
  .features-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:520px){
  #pageGrid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr)); gap:10px;}
  .hero{padding:34px 0 16px;}
  .toolbar{padding:12px;}
  .features-grid{grid-template-columns:1fr 1fr;}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important; transition-duration:.001ms !important;}
}
@media (prefers-contrast:more){
  :root{--line:rgba(20,71,230,0.4);}
}