:root{
    --navy:#0F2340;
    --navy-light:#173355;
    --navy-deep:#081527;
    --paper:#F5F2EA;
    --amber:#E8A33D;
    --amber-dim:#c98a2b;
    --copper:#B5652D;
    --ink:#161616;
    --line:#C9C2B4;
    --green:#4C7A5E;
    --white:#FFFFFF;
    --mono:'IBM Plex Mono',monospace;
    --sans:'IBM Plex Sans',sans-serif;
    --disp:'Space Grotesk',sans-serif;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  body{font-family:var(--sans);color:var(--ink);background:var(--paper);}
  a{color:inherit;text-decoration:none;}
  button{font-family:inherit;cursor:pointer;border:none;}

  /* blueprint grid backgrounds */
  .grid-dark{
    background-color:var(--navy);
    background-image:
      linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
    background-size:32px 32px;
  }
  .grid-light{
    background-color:var(--paper);
    background-image:
      linear-gradient(rgba(15,35,64,.06) 1px, transparent 1px),
      linear-gradient(90deg, rgba(15,35,64,.06) 1px, transparent 1px);
    background-size:28px 28px;
  }

  /* ---------- demo nav (not part of the product) ---------- */
  .demo-nav{
    position:fixed; bottom:16px; left:50%; transform:translateX(-50%);
    z-index:999; background:var(--navy-deep); border:1px solid rgba(255,255,255,.15);
    border-radius:100px; padding:6px; display:flex; gap:4px; box-shadow:0 8px 24px rgba(0,0,0,.35);
  }
  .demo-nav button{
    font-family:var(--mono); font-size:11px; letter-spacing:.04em; text-transform:uppercase;
    color:rgba(255,255,255,.55); background:transparent; padding:8px 14px; border-radius:100px;
    transition:.15s;
  }
  .demo-nav button.active{background:var(--amber); color:var(--navy-deep); font-weight:600;}
  .demo-nav button:hover:not(.active){color:#fff;}

  .view{display:none;}
  .view.active{display:block;}

  /* ================= LANDING ================= */
  .navbar{
    display:flex; align-items:center; justify-content:space-between;
    padding:22px 5vw; position:relative; z-index:2;
  }
  .navbar .logo{position:absolute; left:50%; transform:translateX(-50%);}
  .logo{font-family:var(--disp); font-weight:700; font-size:27px; line-height:1; color:#fff; letter-spacing:.005em;}
  .logo span{
    background: linear-gradient(110deg, #ffd28a 0%, var(--amber) 30%, var(--copper) 50%, var(--amber) 70%, #ffd28a 100%);
    background-size: 250% auto;
    -webkit-background-clip: text; background-clip: text; color: transparent;
    animation: logo-brillo 7s ease-in-out infinite;
    filter: drop-shadow(0 0 10px rgba(232,163,61,.35));
  }
  @keyframes logo-brillo{
    0%{background-position:0% 50%;} 50%{background-position:100% 50%;} 100%{background-position:0% 50%;}
  }
  .nav-links{display:flex; gap:32px; align-items:center;}
  .nav-links a{font-size:14px; color:rgba(255,255,255,.75); font-weight:500;}
  .nav-links a:hover{color:#fff;}
  .btn{
    font-family:var(--sans); font-weight:600; font-size:14px; padding:11px 22px;
    border-radius:4px; display:inline-block; transition:.15s;
  }
  .btn-amber{background:var(--amber); color:var(--navy-deep);}
  .btn-amber:hover{background:#f0b355;}
  .btn-outline{border:1px solid rgba(255,255,255,.3); color:#fff;}
  .btn-outline:hover{border-color:#fff; background:rgba(255,255,255,.06);}
  .btn-navy{background:var(--navy); color:#fff;}
  .btn-navy:hover{background:var(--navy-light);}

  .hero{
    position:relative; padding:64px 5vw 90px; overflow:hidden;
  }
  .hero-inner{
    display:grid; grid-template-columns:1.1fr 1fr; gap:40px; align-items:center; position:relative; z-index:2;
  }
  .eyebrow{
    font-family:var(--mono); font-size:12px; letter-spacing:.12em; text-transform:uppercase;
    color:var(--amber); margin-bottom:18px; display:flex; align-items:center; gap:8px;
  }
  .eyebrow::before{content:'';width:18px;height:1px;background:var(--amber);}
  h1{
    font-family:var(--disp); font-size:clamp(32px,4.4vw,52px); font-weight:700; color:#fff;
    line-height:1.08; letter-spacing:-.01em; margin-bottom:22px;
  }
  h1 em{font-style:normal; color:var(--amber);}
  .hero p.lead{
    font-size:17px; color:rgba(255,255,255,.7); line-height:1.6; max-width:46ch; margin-bottom:34px;
  }
  .hero-ctas{display:flex; gap:14px; flex-wrap:wrap;}
  .hero-note{
    margin-top:18px; font-family:var(--mono); font-size:12px; color:rgba(255,255,255,.45);
  }

  /* signature: single-line diagram */
  .diagram-wrap{position:relative;}
  .diagram-card{
    background:var(--navy-deep); border:1px solid rgba(255,255,255,.1); border-radius:8px;
    padding:26px; position:relative; box-shadow:0 30px 70px rgba(0,0,0,.35), 0 0 0 1px rgba(255,255,255,.03);
  }
  .diagram-card .tag{
    font-family:var(--mono); font-size:10.5px; color:rgba(255,255,255,.4); letter-spacing:.08em;
    display:flex; justify-content:space-between; margin-bottom:14px; text-transform:uppercase;
  }
  .diagram-card .tag b{color:var(--amber); font-weight:600;}
  svg.sld{width:100%; height:auto; display:block;}
  .sld-line{
    fill:none; stroke:rgba(232,163,61,.85); stroke-width:2;
    stroke-dasharray:600; stroke-dashoffset:600;
    animation:draw 2.6s ease forwards .3s;
  }
  .sld-node{fill:var(--navy-deep); stroke:rgba(255,255,255,.5); stroke-width:1.4;}
  .sld-label{font-family:var(--mono); font-size:9.5px; fill:rgba(255,255,255,.55);}
  .sld-value{font-family:var(--mono); font-size:9.5px; fill:var(--amber); font-weight:600;}
  @keyframes draw{to{stroke-dashoffset:0;}}

  .stat-row{display:flex; gap:0; margin-top:18px; border-top:1px solid rgba(255,255,255,.1);}
  .stat{flex:1; padding:14px 0 0; border-right:1px solid rgba(255,255,255,.1);}
  .stat:last-child{border-right:none;}
  .stat b{display:block; font-family:var(--mono); color:#fff; font-size:16px;}
  .stat span{font-size:10.5px; color:rgba(255,255,255,.45); text-transform:uppercase; letter-spacing:.06em;}

  /* features */
  .section{padding:80px 5vw;}
  .section-head{max-width:56ch; margin-bottom:48px;}
  .section-head .eyebrow{color:var(--copper);}
  .section-head .eyebrow::before{background:var(--copper);}
  .section-head h2{font-family:var(--disp); font-size:clamp(26px,3vw,36px); font-weight:700; color:var(--navy);}
  .features{display:grid; grid-template-columns:repeat(4,1fr); gap:18px;}
  .feature{
    background:var(--paper); border-radius:8px; padding:26px 22px; position:relative;
    box-shadow:0 12px 28px rgba(0,0,0,.18); transition:.2s; border-top:3px solid transparent;
  }
  .feature:hover{transform:translateY(-3px); box-shadow:0 16px 36px rgba(0,0,0,.24);}
  .feature-icon{
    width:38px; height:38px; border-radius:8px; display:flex; align-items:center; justify-content:center;
    margin-bottom:16px;
  }
  .feature-icon svg{width:20px; height:20px;}
  .fi-amber{background:rgba(232,163,61,.15); color:var(--amber-dim);}
  .fi-copper{background:rgba(181,101,45,.13); color:var(--copper);}
  .fi-green{background:rgba(76,122,94,.14); color:#3d6650;}
  .fi-navy{background:rgba(15,35,64,.08); color:var(--navy);}
  .feature:nth-child(1){border-top-color:var(--amber);}
  .feature:nth-child(2){border-top-color:var(--copper);}
  .feature:nth-child(3){border-top-color:#3d6650;}
  .feature:nth-child(4){border-top-color:var(--navy);}
  .feature .num{font-family:var(--mono); font-size:10.5px; color:#999; margin-bottom:10px; letter-spacing:.04em; text-transform:uppercase;}
  .feature h3{font-family:var(--disp); font-size:16px; font-weight:600; color:var(--navy); margin-bottom:8px;}
  .feature p{font-size:13.5px; color:#555; line-height:1.55;}

  /* pricing */
  .pricing-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px; max-width:820px;}
  .plan{
    border:1px solid var(--line); border-radius:8px; padding:32px; background:#fff; position:relative;
  }
  .plan.pro{border-color:var(--navy); background:var(--navy);}
  .plan .plan-name{font-family:var(--mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--copper); margin-bottom:10px;}
  .plan.pro .plan-name{color:var(--amber);}
  .plan h3{font-family:var(--disp); font-size:24px; font-weight:700; color:var(--navy); margin-bottom:4px;}
  .plan.pro h3{color:#fff;}
  .plan .price{font-family:var(--mono); font-size:13px; color:#777; margin-bottom:20px;}
  .plan.pro .price{color:rgba(255,255,255,.6);}
  .plan ul{list-style:none; margin-bottom:26px;}
  .plan li{font-size:13.5px; color:#444; padding:7px 0; border-top:1px solid #eee; display:flex; gap:8px;}
  .plan.pro li{color:rgba(255,255,255,.8); border-top:1px solid rgba(255,255,255,.1);}
  .plan li::before{content:'—'; color:var(--copper);}
  .plan.pro li::before{color:var(--amber);}
  .badge{
    position:absolute; top:-11px; right:24px; background:var(--amber); color:var(--navy-deep);
    font-family:var(--mono); font-size:10px; font-weight:600; padding:4px 10px; border-radius:100px;
    text-transform:uppercase; letter-spacing:.05em;
  }
  .plan{transition:.2s; box-shadow:0 1px 2px rgba(15,35,64,.04);}
  .plan:hover{box-shadow:0 12px 32px rgba(15,35,64,.08); transform:translateY(-2px);}
  .plan.pro{box-shadow:0 20px 48px rgba(8,21,39,.28);}
  .plan.pro:hover{transform:translateY(-2px);}
  .plan-note{
    font-family:var(--mono); font-size:11.5px; color:#8a8a8a; line-height:1.5;
    padding-top:14px; border-top:1px dashed var(--line);
  }
  .plan-student{
    background:linear-gradient(165deg, #4C7A5E, #35594A 75%);
    border:1px solid #2b4a3d;
  }
  .plan-student .plan-name{ color:#fff; letter-spacing:.08em; }
  .plan-student h3{ color:#fff; }
  .plan-student .price{ color: rgba(255,255,255,.82); font-weight:500; }
  .plan-student li{ color: rgba(255,255,255,.9); border-top-color: rgba(255,255,255,.2); }
  .plan-student li::before{ color: var(--amber); }
  .plan-student .plan-note{ color: rgba(255,255,255,.7); border-top-color: rgba(255,255,255,.25); }
  .plan-student .plan-icon{ background: rgba(255,255,255,.16); color:#fff; }
  .plan-student .badge-student{ background: var(--amber); border-color: var(--amber); color: var(--navy-deep); }
  .plan-icon{
    width:40px; height:40px; border-radius:8px; display:flex; align-items:center; justify-content:center;
    margin-bottom:16px; background:rgba(232,163,61,.14); color:var(--amber-dim);
  }
  .plan-icon svg{width:21px; height:21px;}
  .plan-icon-pro{background:rgba(232,163,61,.18); color:var(--amber);}
  .badge-student{
    background:transparent; border:1px solid var(--amber); color:var(--amber-dim);
    top:-11px;
  }

  footer{padding:40px 5vw; border-top:1px solid rgba(255,255,255,.1); display:flex; justify-content:space-between; align-items:center;}
  footer p{font-family:var(--mono); font-size:11.5px; color:rgba(255,255,255,.4);}

  /* ================= LOGIN ================= */
  .login-screen{min-height:100vh; display:flex; align-items:center; justify-content:center; padding:24px;}
  .login-card{
    width:100%; max-width:380px; background:#fff; border:1px solid var(--line); border-radius:8px;
    padding:38px 34px; position:relative; z-index:2; box-shadow:0 30px 70px rgba(0,0,0,.35);
  }
  .login-card .logo{color:var(--navy); margin-bottom:6px; text-align:center;}
  .login-sub{font-size:13px; color:#777; margin-bottom:28px;}
  .field{margin-bottom:16px;}
  .field label{
    display:block; font-family:var(--mono); font-size:10.5px; text-transform:uppercase; letter-spacing:.06em;
    color:#888; margin-bottom:6px;
  }
  .field input{
    width:100%; padding:11px 12px; border:1px solid var(--line); border-radius:4px; font-size:14px;
    background:var(--paper); font-family:var(--sans);
  }
  .field input:focus{outline:2px solid var(--amber); outline-offset:1px; border-color:var(--amber);}
  .login-card .btn{width:100%; text-align:center; margin-top:6px;}
  .login-foot{margin-top:20px; text-align:center; font-size:12.5px; color:#888;}
  .login-foot a{color:var(--copper); font-weight:600;}

  /* ================= DASHBOARD ================= */
  .app-shell{min-height:100vh; background:var(--paper);}
  .app-top{
    background-color:var(--navy);
    background-image:
      linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
    background-size:28px 28px;
    padding:0 5vw; display:flex; align-items:center; justify-content:space-between; height:64px;
    box-shadow:0 2px 12px rgba(0,0,0,.12);
    position:relative;
  }
  .app-top .logo{position:absolute; left:50%; transform:translateX(-50%);}
  .user-pill{
    display:flex; align-items:center; gap:8px; color:#fff; font-size:13px; font-weight:500;
    background:rgba(255,255,255,.08); padding:7px 14px; border-radius:100px;
  }
  .user-pill .dot{width:7px; height:7px; border-radius:50%; background:var(--amber);}

  .plan-banner{
    display:flex; align-items:center; justify-content:space-between; background:#fff; border-bottom:1px solid var(--line);
    padding:14px 5vw;
  }
  .plan-banner .info{display:flex; align-items:center; gap:12px;}
  .plan-banner .info .desc{display:flex; flex-direction:column; gap:2px;}
  .plan-tag{
    font-family:var(--mono); font-size:10.5px; text-transform:uppercase; letter-spacing:.06em;
    background:rgba(76,122,94,.12); color:var(--green); padding:5px 10px; border-radius:4px; font-weight:600;
  }
  .plan-banner .desc{font-size:13.5px; color:#555;}
  .plan-banner .desc b{color:var(--navy);}
  .plan-banner .desc small{display:block; font-family:var(--mono); font-size:11px; color:#999; margin-top:2px;}

  .dash-main{padding:36px 5vw 80px;}
  .dash-head{display:flex; justify-content:space-between; align-items:flex-end; margin-bottom:26px;}
  .dash-head h2{font-family:var(--disp); font-size:26px; color:var(--navy); font-weight:700;}
  .dash-head p{font-size:13px; color:#888; margin-top:4px;}

  .proj-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:18px;}
  .proj-card{
    background:#fff; border:1px solid var(--line); border-radius:6px; padding:20px; position:relative;
    transition:.15s;
  }
  .proj-card:hover{border-color:var(--copper); box-shadow:0 4px 14px rgba(15,35,64,.06);}
  .proj-card .kwp{font-family:var(--mono); font-size:22px; color:var(--navy); font-weight:600;}
  .proj-card .kwp span{font-size:12px; color:#999; font-weight:400;}
  .proj-card h4{font-family:var(--disp); font-size:15px; margin:10px 0 4px; color:var(--ink);}
  .proj-card .meta{font-family:var(--mono); font-size:11px; color:#999; margin-bottom:8px;}
  .proj-card-cliente{
    font-family:var(--mono); font-size:11px; color:#999; margin-bottom:16px; min-height:14px;
  }
  .proj-card-cliente-vacio{ font-style:italic; color:#bbb; }
  .proj-card .actions{display:flex; gap:6px;}
  .proj-card .actions button, .proj-card .actions a{
    flex:1; font-size:11.5px; font-weight:600; padding:9px 0; border-radius:5px; text-align:center;
    display:block; border:none; transition:.15s; cursor:pointer; font-family:inherit;
  }
  .act-open{background:var(--navy); color:#fff;}
  .act-open:hover{background:var(--navy-light);}
  .act-edit{background:rgba(232,163,61,.12); color:#a3690f; border:1px solid rgba(232,163,61,.3)!important;}
  .act-edit:hover{background:var(--amber); color:var(--navy-deep); border-color:var(--amber)!important;}
  .act-del{background:rgba(192,57,43,.08); color:#c0392b; border:1px solid rgba(192,57,43,.2)!important;}
  .act-del:hover{background:#c0392b; color:#fff; border-color:#c0392b!important;}

  .proj-card.new{
    border:1.5px dashed var(--line); background:transparent; display:flex; flex-direction:column;
    align-items:center; justify-content:center; text-align:center; color:#999; min-height:168px;
  }
  .proj-card.new .plus{
    width:36px; height:36px; border-radius:50%; background:var(--amber); color:var(--navy-deep);
    display:flex; align-items:center; justify-content:center; font-size:20px; margin-bottom:10px; font-weight:600;
  }
  .proj-card.new:hover{border-color:var(--amber); color:var(--navy);}

  .promo-card{
    background:linear-gradient(165deg, #4C7A5E, #35594A 75%);
    border:1px solid #2b4a3d; display:flex; flex-direction:column;
  }
  .promo-icon{
    width:34px; height:34px; border-radius:8px; background:rgba(255,255,255,.16);
    display:flex; align-items:center; justify-content:center; color:var(--amber); margin-bottom:12px;
  }
  .promo-icon svg{width:18px; height:18px;}
  .promo-card h4{color:#fff; margin-bottom:8px;}
  .promo-card p{
    font-size:12.5px; color:rgba(255,255,255,.8); line-height:1.5; margin-bottom:16px; flex:1;
  }
  .promo-btn{width:100%; text-align:center; font-size:12.5px; padding:9px 0;}

  /* ================= EDITOR ================= */
  .proj-breadcrumb{
    display:flex; justify-content:space-between; align-items:center; padding:14px 5vw;
    background:#fff; border-bottom:1px solid var(--line);
  }
  .crumb{font-size:13px; color:#999;}
  .crumb span{margin:0 6px;}
  .crumb b{color:var(--navy); font-weight:600;}
  .save-status{
    font-family:var(--mono); font-size:11px; color:#999; display:flex; align-items:center; gap:6px;
  }
  .dot-save{width:6px; height:6px; border-radius:50%; background:var(--green);}
  .module-strip{
    display:flex; gap:8px; padding:12px 5vw; background:var(--paper); border-bottom:1px solid var(--line); flex-wrap:wrap;
  }
  .mod{
    font-family:var(--mono); font-size:11px; padding:5px 11px; border-radius:100px; font-weight:600;
    letter-spacing:.02em;
  }
  .mod.done{background:rgba(76,122,94,.12); color:var(--green);}
  .mod.pending{background:rgba(0,0,0,.05); color:#999;}
  .pdf-page{
    background:var(--paper); border:1px solid var(--line); border-radius:4px; padding:18px;
    aspect-ratio:210/280; display:flex; flex-direction:column; justify-content:flex-start;
  }
  .pdf-line{height:6px; background:var(--line); border-radius:2px; margin-bottom:9px;}
  .editor-tabs{display:flex; gap:2px; background:var(--line); padding:14px 5vw 0; border-bottom:1px solid var(--line);}
  .etab{
    font-family:var(--mono); font-size:12px; padding:12px 18px; background:#fff; color:#888;
    text-transform:uppercase; letter-spacing:.04em; border-top-left-radius:4px; border-top-right-radius:4px;
  }
  .etab.active{background:var(--navy); color:#fff;}
  .editor-body{padding:32px 5vw 80px; display:grid; grid-template-columns:1fr 320px; gap:28px;}
  .panel{background:#fff; border:1px solid var(--line); border-radius:6px; padding:24px;}
  .panel h3{font-family:var(--disp); font-size:16px; color:var(--navy); margin-bottom:16px;}
  .form-row{display:grid; grid-template-columns:1fr 1fr; gap:14px; margin-bottom:14px;}
  .norm-note{
    font-family:var(--mono); font-size:11px; color:var(--copper); background:rgba(181,101,45,.08);
    padding:8px 10px; border-radius:4px; margin-top:6px;
  }
  .sidebar-panel{display:flex; flex-direction:column; gap:16px;}
  .result-line{display:flex; justify-content:space-between; font-size:13px; padding:8px 0; border-bottom:1px dashed var(--line);}
  .result-line b{font-family:var(--mono); color:var(--navy);}

  @media(max-width:860px){
    .hero-inner{grid-template-columns:1fr;}
    .features{grid-template-columns:1fr 1fr;}
    .pricing-grid{grid-template-columns:1fr;}
    .editor-body{grid-template-columns:1fr;}
    .nav-links{display:none;}
  }