:root{
    --bg:#f6fafc;
    --bg-alt:#e9f4f9;
    --navy:#173247;
    --navy-soft:#3c5a6d;
    --blue:#3f93c9;
    --blue-deep:#2c74a6;
    --blue-pale:#bfe4f2;
    --blue-mist:#dcf0f7;
    --white:#ffffff;
    --line:#cfe6ef;
    --shadow: 0 20px 50px -25px rgba(23,50,71,0.35);
    --radius: 22px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    font-family:'Manrope', sans-serif;
    color:var(--navy);
    background:var(--bg);
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.script{
    font-family:'Fraunces', serif;
    margin:0;
    letter-spacing:-0.01em;
  }
  .eyebrow{
    font-family:'Manrope',sans-serif;
    font-weight:700;
    font-size:0.72rem;
    letter-spacing:0.22em;
    text-transform:uppercase;
    color:var(--blue-deep);
  }
  .script{
    font-style:italic;
    font-weight:400;
    color:var(--blue-deep);
  }
  p{line-height:1.65; color:var(--navy-soft);}
  a{color:inherit;}
  img,svg{display:block; max-width:100%;}
  .wrap{
    max-width:1180px;
    margin:0 auto;
    padding:0 32px;
  }
  section{position:relative;}

  /* ---------- NAV ---------- */
  .nav{
    position:sticky; top:0; z-index:50;
    background:rgba(246,250,252,0.86);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav .wrap{
    display:flex; align-items:center; justify-content:space-between;
    padding-top:16px; padding-bottom:16px;
  }
  .logo{
    display:flex; align-items:center; gap:10px;
    font-family:'Fraunces', serif; font-weight:600; font-size:1.25rem;
    color:var(--navy);
  }
  .logo .dot{width:9px;height:9px;border-radius:50%;background:var(--blue);}
  .nav-links{display:flex; align-items:center; gap:28px; font-size:0.92rem; font-weight:600;}
  .nav-links a{text-decoration:none; color:var(--navy-soft); transition:color .2s;}
  .nav-links a:hover{color:var(--blue-deep);}
  .nav-cta{
    display:inline-flex; align-items:center; gap:8px;
    background:var(--navy);
    color:var(--white) !important;
    padding:11px 20px;
    border-radius:100px;
    font-weight:700; font-size:0.88rem;
    text-decoration:none;
    transition:background .2s, transform .2s;
  }
  .nav-cta:hover{background:var(--blue-deep); transform:translateY(-1px);}

  /* ---------- HERO ---------- */
  .hero{
    padding:76px 0 40px;
    overflow:hidden;
  }
  .hero .wrap{
    display:grid;
    grid-template-columns:1.05fr 0.95fr;
    gap:56px;
    align-items:center;
  }
  .hero h1{
    font-size:clamp(2.4rem, 4.4vw, 3.6rem);
    line-height:1.04;
    font-weight:500;
    color:var(--navy);
  }
  .hero h1 span{color:var(--blue-deep); font-weight:600;}
  .hero .script{
    display:block;
    font-size:clamp(1.4rem, 2.2vw, 1.9rem);
    margin-top:18px;
  }
  .hero p.lead{
    margin-top:22px; max-width:46ch; font-size:1.04rem;
  }
  .hero-cta{
    display:flex; gap:14px; flex-wrap:wrap; margin-top:32px;
  }
  .btn-primary{
    background:var(--blue-deep); color:var(--white);
    padding:15px 28px; border-radius:100px;
    font-weight:700; font-size:0.95rem;
    text-decoration:none; display:inline-flex; align-items:center; gap:8px;
    box-shadow:0 14px 28px -12px rgba(44,116,166,0.55);
    transition:transform .2s, box-shadow .2s;
    border:none; cursor:pointer;
  }
  .btn-primary:hover{transform:translateY(-2px); box-shadow:0 18px 34px -12px rgba(44,116,166,0.65);}
  .btn-ghost{
    background:transparent; color:var(--navy);
    padding:15px 26px; border-radius:100px;
    font-weight:700; font-size:0.95rem;
    text-decoration:none; display:inline-flex; align-items:center; gap:8px;
    border:1.5px solid var(--line);
    transition:border-color .2s, background .2s;
  }
  .btn-ghost:hover{border-color:var(--blue); background:var(--bg-alt);}

  .hero-visual{
    position:relative;
    aspect-ratio:1/1;
    display:flex; align-items:center; justify-content:center;
  }
  .hero-visual .halo{
    position:absolute; inset:0;
    background:radial-gradient(circle at 50% 42%, var(--blue-mist) 0%, transparent 68%);
  }

  /* ---------- USP STRIP ---------- */
  .usp{
    background:var(--white);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    padding:52px 0;
  }
  .usp .wrap{
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:36px;
  }
  .usp-item{display:flex; gap:16px; align-items:flex-start;}
  .usp-icon{
    flex:none;
    width:52px; height:52px; border-radius:16px;
    background:var(--bg-alt);
    display:flex; align-items:center; justify-content:center;
  }
  .usp-item h3{font-size:1.05rem; font-weight:700; font-family:'Manrope',sans-serif; color:var(--navy);}
  .usp-item p{margin-top:4px; font-size:0.92rem;}

  /* ---------- SHADE LAB (signature) ---------- */
  .shadelab{
    padding:104px 0 96px;
  }
  .shadelab-head{
    max-width:640px; margin:0 auto 56px; text-align:center;
  }
  .shadelab-head h2{
    font-size:clamp(1.9rem,3vw,2.5rem); font-weight:500; margin-top:12px;
  }
  .shadelab-head p{margin:16px auto 0; max-width:52ch;}
  .lab-card{
    background:var(--navy);
    border-radius:32px;
    padding:56px;
    display:grid;
    grid-template-columns:0.9fr 1.1fr;
    gap:56px;
    align-items:center;
    color:var(--white);
    box-shadow:var(--shadow);
  }
  .tooth-stage{
    display:flex; flex-direction:column; align-items:center; gap:22px;
  }
  .tooth-stage svg{width:150px; height:190px;}
  .shade-readout{text-align:center;}
  .shade-readout .big{
    font-family:'Fraunces', serif; font-size:2.6rem; font-weight:600; line-height:1;
  }
  .shade-readout .small{
    font-size:0.82rem; letter-spacing:0.14em; text-transform:uppercase; color:var(--blue-pale); margin-top:6px; font-weight:700;
  }
  .lab-controls{display:flex; flex-direction:column; gap:22px;}
  .lab-controls > p{color:var(--blue-mist); font-size:0.95rem;}
  input[type="range"]{
    -webkit-appearance:none; appearance:none;
    width:100%; height:6px; border-radius:6px;
    background:linear-gradient(90deg, #b8875a, #e8c99a, #f4e6cf, #ffffff);
    outline:none;
  }
  input[type="range"]::-webkit-slider-thumb{
    -webkit-appearance:none; appearance:none;
    width:26px; height:26px; border-radius:50%;
    background:var(--white);
    border:5px solid var(--blue-deep);
    cursor:pointer;
    box-shadow:0 4px 10px rgba(0,0,0,0.35);
  }
  input[type="range"]::-moz-range-thumb{
    width:26px; height:26px; border-radius:50%;
    background:var(--white);
    border:5px solid var(--blue-deep);
    cursor:pointer;
  }
  .swatch-row{display:flex; gap:8px; justify-content:space-between;}
  .swatch{
    flex:1; height:34px; border-radius:8px;
    display:flex; align-items:center; justify-content:center;
    font-size:0.72rem; font-weight:700; color:var(--navy);
    opacity:0.45; transition:opacity .2s, transform .2s;
  }
  .swatch.active{opacity:1; transform:translateY(-3px);}
  .lab-foot{
    font-size:0.85rem; color:var(--blue-pale); border-top:1px solid rgba(255,255,255,0.14); padding-top:16px;
  }

  /* ---------- PROCESS ---------- */
  .process{
    padding:100px 0;
    background:var(--bg-alt);
  }
  .process-head{max-width:640px; margin:0 auto 56px; text-align:center;}
  .process-head h2{font-size:clamp(1.9rem,3vw,2.5rem); font-weight:500; margin-top:12px;}
  .process-head p{margin:16px auto 0; max-width:56ch;}
  .steps{
    display:grid;
    grid-template-columns:repeat(5, 1fr);
    gap:20px;
  }
  .step{
    background:var(--white);
    border-radius:20px;
    padding:26px 20px 24px;
    border:1px solid var(--line);
    position:relative;
  }
  .step .num{
    font-family:'Fraunces', serif;
    font-size:2.1rem; font-weight:600;
    color:var(--blue-pale);
    -webkit-text-stroke:1.5px var(--blue-deep);
    margin-bottom:14px;
  }
  .step h3{font-size:0.98rem; font-weight:700; color:var(--navy); font-family:'Manrope',sans-serif; line-height:1.3;}
  .step p{margin-top:8px; font-size:0.85rem;}
  .step .time{
    display:inline-block; margin-top:14px;
    font-size:0.72rem; font-weight:700; letter-spacing:0.04em;
    color:var(--blue-deep); background:var(--blue-mist);
    padding:4px 10px; border-radius:100px;
  }

  /* ---------- BENEFITS ---------- */
  .benefits{padding:100px 0;}
  .benefits .wrap{
    display:grid;
    grid-template-columns:0.85fr 1.15fr;
    gap:64px;
    align-items:center;
  }
  .benefits h2{font-size:clamp(1.9rem,3vw,2.5rem); font-weight:500; margin-top:12px;}
  .benefits p.lead{margin-top:16px; max-width:44ch;}
  .check-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:18px;
  }
  .check-item{
    display:flex; gap:14px; align-items:flex-start;
    background:var(--white);
    border:1px solid var(--line);
    border-radius:16px;
    padding:20px;
  }
  .check-item svg{flex:none; margin-top:2px;}
  .check-item h4{margin:0; font-size:0.95rem; font-weight:700; color:var(--navy);}
  .check-item p{margin-top:4px; font-size:0.84rem;}

  /* ---------- FAQ ---------- */
  .faq{padding:90px 0 110px; background:var(--bg-alt);}
  .faq .wrap{max-width:820px;}
  .faq-head{text-align:center; margin-bottom:44px;}
  .faq-head h2{font-size:clamp(1.9rem,3vw,2.5rem); font-weight:500; margin-top:12px;}
  .faq-item{
    background:var(--white);
    border:1px solid var(--line);
    border-radius:16px;
    padding:22px 26px;
    margin-bottom:14px;
  }
  .faq-item summary{
    cursor:pointer; font-weight:700; color:var(--navy); font-size:0.98rem;
    list-style:none; display:flex; justify-content:space-between; align-items:center; gap:16px;
  }
  .faq-item summary::-webkit-details-marker{display:none;}
  .faq-item summary .plus{font-size:1.3rem; color:var(--blue-deep); transition:transform .25s; flex:none;}
  .faq-item[open] summary .plus{transform:rotate(45deg);}
  .faq-item p{margin-top:12px; font-size:0.9rem;}

  /* ---------- CONTACT / CTA ---------- */
  .contact{
    padding:100px 0 0;
  }
  .contact-card{
    background:var(--navy);
    border-radius:32px 32px 0 0;
    padding:64px 56px 0;
    color:var(--white);
    display:grid;
    grid-template-columns:1fr 0.9fr;
    gap:48px;
  }
  .contact-card h2{font-size:clamp(1.9rem,3vw,2.4rem); font-weight:500;}
  .contact-card p{color:var(--blue-mist); margin-top:14px; max-width:42ch;}
  .contact-links{display:flex; flex-direction:column; gap:14px; margin-top:28px;}
  .contact-links a{
    display:flex; align-items:center; gap:12px;
    color:var(--white); text-decoration:none; font-weight:700; font-size:1.05rem;
  }
  .contact-links a .ic{
    width:40px; height:40px; border-radius:50%;
    background:rgba(255,255,255,0.12);
    display:flex; align-items:center; justify-content:center; flex:none;
  }
  form.book{
    background:rgba(255,255,255,0.06);
    border:1px solid rgba(255,255,255,0.14);
    border-radius:20px;
    padding:28px;
  }
  form.book .f-title{font-weight:700; margin-bottom:16px;}
  form.book label{display:block; font-size:0.78rem; color:var(--blue-mist); margin-bottom:6px; font-weight:600;}
  form.book input{
    width:100%; padding:12px 14px; margin-bottom:14px;
    border-radius:10px; border:1px solid rgba(255,255,255,0.2);
    background:rgba(255,255,255,0.08); color:var(--white); font-family:inherit; font-size:0.92rem;
  }
  form.book input::placeholder{color:rgba(255,255,255,0.45);}
  form.book button{
    width:100%; padding:14px; border:none; border-radius:10px;
    background:var(--blue); color:var(--white); font-weight:700; font-size:0.95rem; cursor:pointer;
    transition:background .2s;
  }
  form.book button:hover{background:var(--blue-deep);}
  .form-note{font-size:0.78rem; color:rgba(255,255,255,0.55); margin-top:10px;}

  .bottom-bar{
    background:var(--navy);
    border-top:1px solid rgba(255,255,255,0.12);
    margin-top:56px;
    padding:22px 0;
  }
  .bottom-bar .wrap{
    display:flex; justify-content:space-between; align-items:center;
    color:rgba(255,255,255,0.6); font-size:0.8rem;
  }
  .bottom-bar .wrap a{color:rgba(255,255,255,0.8); text-decoration:none;}

  @media (max-width: 880px){
    .hero .wrap{grid-template-columns:1fr; gap:40px;}
    .hero-visual{order:-1; max-width:340px; margin:0 auto;}
    .usp .wrap{grid-template-columns:1fr; gap:26px;}
    .lab-card{grid-template-columns:1fr; padding:36px 26px;}
    .steps{grid-template-columns:repeat(2,1fr);}
    .benefits .wrap{grid-template-columns:1fr;}
    .check-grid{grid-template-columns:1fr;}
    .contact-card{grid-template-columns:1fr; padding:48px 26px 0;}
    .nav-links{display:none;}
  }