:root{
    --white:#ffffff;
    --black:#101114;

    --red:#E53935;
    --red-dark:#b1201d;
    --blue:#0057D9;
    --blue-dark:#003b99;

    --bg:#F5F5F5;
    --card:#ffffff;

    --text:#222222;
    --muted:#737985;
    --border:#e5e7eb;

    --shadow:0 25px 70px rgba(10,20,40,.10);
    --shadow-small:0 10px 30px rgba(10,20,40,.08);
    --radius:20px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
    margin:0;
    background:transparent;
    color:var(--text);
    font-family:"DM Sans",sans-serif;
    -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;}
button,input,select,textarea{font-family:inherit;}

.top-line{
    height:4px;
    background:linear-gradient(90deg,var(--red) 0%,var(--red) 50%,var(--blue) 50%,var(--blue) 100%);
}

.header{
    background:rgba(255,255,255,.96);
    backdrop-filter:blur(15px);
    border-bottom:1px solid var(--border);
    position:sticky; top:0; z-index:100;
}
.header-inner{
    max-width:1280px; margin:auto; padding:20px 28px;
    display:flex; align-items:center; justify-content:space-between; gap:25px;
}
.brand{display:flex; align-items:center; gap:14px;}
.logo{
    width:52px; height:52px; border-radius:14px;
    display:flex; align-items:center; justify-content:center;
    background:linear-gradient(135deg,var(--red),var(--blue));
    box-shadow:0 8px 22px rgba(0,87,217,.22);
    position:relative;
}
.logo:before{content:"";width:24px;height:24px;border:3px solid white;transform:rotate(45deg);}
.logo:after{content:"";position:absolute;width:10px;height:10px;background:white;transform:rotate(45deg);}
.brand-name{font-family:"Playfair Display",serif;font-weight:700;font-size:20px;}
.brand-sub{color:var(--muted);font-size:10px;letter-spacing:.18em;text-transform:uppercase;margin-top:3px;}
.header-title{text-align:right;}
.header-title h1{font-family:"Playfair Display",serif;font-size:25px;}
.header-title p{margin-top:4px;font-size:12px;color:var(--muted);}

.container{max-width:1280px;margin:auto;padding:45px 25px 80px;}
.page-intro{margin-bottom:30px;}
.page-intro .eyebrow{font-size:11px;color:var(--red);font-weight:700;text-transform:uppercase;letter-spacing:.18em;margin-bottom:8px;}
.page-intro h2{font-family:"Playfair Display",serif;font-size:36px;}
.page-intro p{color:var(--muted);margin:8px 0 0;max-width:700px;}

.main-grid{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(340px,.85fr);gap:30px;align-items:start;}
.form-card{background:rgba(255,255,255,.95);border:1px solid var(--border);border-radius:24px;padding:30px;box-shadow:var(--shadow-small);}

.section{padding-bottom:30px;margin-bottom:30px;border-bottom:1px solid var(--border);}
.section:last-child{border-bottom:none;margin-bottom:0;}
.section-head{display:flex;align-items:flex-start;gap:13px;margin-bottom:18px;}
.section-number{
    width:32px;height:32px;display:flex;align-items:center;justify-content:center;
    border-radius:10px;background:linear-gradient(135deg,var(--red),var(--red-dark));
    color:white;font-size:12px;font-weight:700;flex:none;
    box-shadow:0 6px 15px rgba(229,57,53,.18);
}
.section-title h3{font-family:"Playfair Display",serif;font-size:21px;}
.section-title p{color:var(--muted);font-size:12px;margin-top:4px;}

.option-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:13px;}
.option{position:relative;cursor:pointer;}
.option input{position:absolute;opacity:0;pointer-events:none;}
.option-content{
    min-height:78px;border:1.5px solid var(--border);border-radius:15px;padding:15px;
    background:white;transition:.2s ease;display:flex;flex-direction:column;justify-content:center;
}
.option:hover .option-content{border-color:var(--blue);transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,87,217,.08);}
.option input:checked + .option-content{
    border-color:var(--red);
    background:linear-gradient(135deg,#fff6f7,#fff);
    box-shadow:0 10px 25px rgba(229,57,53,.10);
    transform:translateY(-2px);
}
.option input:checked + .option-content:after{
    content:"✓";position:absolute;top:10px;right:10px;width:21px;height:21px;
    display:flex;align-items:center;justify-content:center;
    background:var(--red);color:white;border-radius:50%;font-size:11px;font-weight:700;
}
.option-title{font-weight:700;font-size:14px;}
.option-rate{color:var(--muted);font-size:11px;margin-top:4px;}
.empty-note{color:var(--muted);font-size:13px;}

.dimension-grid{display:grid;grid-template-columns:1fr 1fr 180px;gap:14px;}
.field label{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.08em;font-weight:700;color:var(--muted);margin-bottom:7px;}
.field input,.field select,.field textarea{
    width:100%;padding:14px;border:1.5px solid var(--border);border-radius:12px;
    background:white;outline:none;font-size:14px;transition:.2s;
}
.field input:focus,.field select:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,87,217,.07);}

.area-chips{display:none;flex-wrap:wrap;gap:8px;margin-top:15px;}
.area-chip{background:var(--bg);border:1px solid var(--border);padding:8px 12px;border-radius:9px;font-size:11px;color:var(--muted);}
.area-chip strong{color:var(--text);}

.dynamic-step{display:none;animation:slideIn .4s ease;}
.dynamic-step.active{display:block;}
@keyframes slideIn{from{opacity:0;transform:translateY(12px);}to{opacity:1;transform:translateY(0);}}

.article-area{display:none;margin-top:22px;padding-top:22px;border-top:1px dashed var(--border);}
.article-area.active{display:block;animation:slideIn .35s ease;}
.article-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px;}
.article-heading h4{font-family:"Playfair Display",serif;font-size:18px;}
.article-heading span{font-size:11px;color:var(--muted);}
.article-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
.article{position:relative;cursor:pointer;}
.article input{position:absolute;opacity:0;pointer-events:none;}
.article-card{border:1.5px solid var(--border);border-radius:15px;overflow:hidden;background:white;transition:.2s;position:relative;}
.article-image{height:130px;background:#eee;overflow:hidden;}
.article-image img{width:100%;height:100%;object-fit:cover;display:block;transition:.4s;}
.article-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-small);}
.article-card:hover img{transform:scale(1.06);}
.article input:checked + .article-card{border-color:var(--red);box-shadow:0 10px 25px rgba(229,57,53,.14);}
.article input:checked + .article-card:after{
    content:"✓";position:absolute;top:9px;right:9px;width:23px;height:23px;border-radius:50%;
    background:var(--red);color:white;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;
}
.article input:disabled + .article-card{opacity:.4;cursor:not-allowed;}
.article-info{padding:10px 11px 12px;}
.article-name{font-size:12px;font-weight:700;}
.article-rate{color:var(--muted);font-size:10px;margin-top:3px;}

.article-pagination{
    display:none;
    align-items:center;justify-content:center;gap:16px;margin-top:16px;
}
.article-pagination.active{display:flex;}
.article-pagination .btn{padding:9px 16px;}
.article-pagination .btn:disabled{opacity:.4;cursor:not-allowed;}
#articlePageInfo{font-size:11px;color:var(--muted);font-weight:700;}

.summary-wrapper{position:sticky;top:100px;}
.summary{background:#fff;border-radius:24px;overflow:hidden;box-shadow:0 25px 70px rgba(0,59,153,.14);border:1px solid rgba(0,87,217,.12);}
.summary-top{
    padding:28px;
    background:radial-gradient(circle at 90% 0%,rgba(255,255,255,.14),transparent 35%),linear-gradient(135deg,var(--blue-dark),var(--blue));
    color:white;
}
.summary-label{font-size:10px;text-transform:uppercase;letter-spacing:.2em;opacity:.7;}
.total{font-family:"Playfair Display",serif;font-size:39px;font-weight:700;margin-top:8px;}
.project-ref{font-size:12px;opacity:.75;margin-top:7px;}
.summary-body{padding:10px 24px 20px;}
.summary-row{display:flex;justify-content:space-between;gap:15px;padding:14px 0;border-bottom:1px solid var(--border);}
.summary-row:last-child{border-bottom:none;}
.summary-name{font-size:12px;color:var(--muted);}
.summary-name strong{display:block;color:var(--text);font-size:13px;margin-bottom:2px;}
.summary-value{font-weight:700;font-size:12px;white-space:nowrap;text-align:right;}
.summary-row.pending .summary-value{color:#c5c8cf;}
.summary-row.pending .summary-name strong{color:#b5b8c0;}

.summary-footer{border-top:1px solid var(--border);padding:18px 24px 22px;}
.progress{height:6px;background:#eef0f4;border-radius:10px;overflow:hidden;}
.progress-bar{width:0%;height:100%;background:linear-gradient(90deg,var(--red),var(--blue));transition:.4s;}
.progress-text{margin-top:9px;font-size:11px;color:var(--muted);}
.disclaimer{margin-top:15px;font-size:10px;line-height:1.6;color:#9296a0;}

.action-area{margin-top:22px;display:flex;gap:10px;}
.btn{border:none;border-radius:12px;padding:13px 18px;cursor:pointer;font-weight:700;font-size:12px;transition:.2s;}
.btn-primary{color:white;background:linear-gradient(135deg,var(--red),var(--red-dark));box-shadow:0 8px 20px rgba(229,57,53,.18);}
.btn-primary:hover{transform:translateY(-2px);}
.btn-primary:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none;}
.btn-secondary{color:var(--blue);background:#eef4ff;}
.btn-secondary:hover{background:#dfeaff;}

.mobile-total{display:none;}

/* MODAL */
.modal-overlay{
    display:none;position:fixed;inset:0;background:rgba(16,17,20,.55);
    z-index:500;align-items:center;justify-content:center;padding:20px;
}
.modal-overlay.active{display:flex;}
.modal{
    background:white;border-radius:20px;padding:30px;max-width:440px;width:100%;
    box-shadow:var(--shadow);max-height:90vh;overflow-y:auto;
}
.modal h3{font-family:"Playfair Display",serif;font-size:21px;}
.modal-sub{color:var(--muted);font-size:12px;margin-top:6px;margin-bottom:20px;}
.modal-field{margin-bottom:14px;}
.modal-field label{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.06em;font-weight:700;color:var(--muted);margin-bottom:6px;}
.modal-field input,.modal-field textarea{
    width:100%;padding:12px 13px;border:1.5px solid var(--border);border-radius:10px;outline:none;font-size:14px;resize:vertical;
}
.modal-field input:focus,.modal-field textarea:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,87,217,.07);}
.modal-error{color:var(--red);font-size:12px;margin-bottom:10px;min-height:16px;}
.modal-actions{display:flex;gap:10px;margin-top:8px;}
.modal-success{text-align:center;}
.success-icon{
    width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--blue));
    color:white;font-size:26px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;
}

@media(max-width:980px){
    .main-grid{grid-template-columns:1fr;}
    .summary-wrapper{position:static;}
}
@media(max-width:700px){
    .header-inner{padding:15px 18px;}
    .header-title{display:none;}
    .container{padding:30px 15px 100px;}
    .page-intro h2{font-size:29px;}
    .form-card{padding:20px;border-radius:18px;}
    .dimension-grid{grid-template-columns:1fr 1fr;}
    .dimension-grid .unit-field{grid-column:1/-1;}
    .option-grid{grid-template-columns:1fr 1fr;}
    .article-grid{grid-template-columns:1fr 1fr;}
    .mobile-total{
        display:flex;position:fixed;left:0;right:0;bottom:0;z-index:200;
        background:white;border-top:1px solid var(--border);padding:12px 16px;
        justify-content:space-between;align-items:center;box-shadow:0 -10px 30px rgba(0,0,0,.08);
    }
    .mobile-total small{display:block;color:var(--muted);font-size:9px;text-transform:uppercase;letter-spacing:.1em;}
    .mobile-total strong{font-family:"Playfair Display",serif;color:var(--blue-dark);font-size:21px;}
}
@media(max-width:430px){
    .option-grid{grid-template-columns:1fr;}
    .article-grid{grid-template-columns:1fr 1fr;}
    .dimension-grid{grid-template-columns:1fr;}
    .dimension-grid .unit-field{grid-column:auto;}
}