/* ======= colour palette (improved mobile-friendly) ======= */
:root{
    --primary:#1e40af;
    --secondary:#3b82f6;
    --accent:#93c5fd;
    --background:#f8fafc;
    --text:#1e293b;
    --card-bg:#ffffff;
}

/* ======= reset / base ======= */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{
    font-family:'Segoe UI',system-ui,sans-serif;
    line-height:1.6;
    background:var(--background);
    color:var(--text);
}

/* ======= header ======= */
.header{
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    padding:1.5rem 1rem;
    text-align:center;
    box-shadow:0 4px 15px rgba(0,0,0,.1)
}
.header h1{color:#fff;font-size:2rem;margin:0;font-weight:600}

/* ======= container ======= */
.container{max-width:1000px;margin:2rem auto;padding:0 1rem}

/* ======= calculator card ======= */
.calculator-card{
    background:var(--card-bg);
    border-radius:20px;
    padding:2rem;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
    margin:2rem 0;
    position:relative
}
.input-note{text-align:center;margin:1rem 0;color:var(--secondary);font-size:1.1rem}

/* grid for state+zip or address */
.input-section{
    display:grid;
    grid-template-columns:1fr 1px 1fr;
    gap:2rem;
    margin:1rem 0
}
.divider{background:var(--accent);width:1px;height:100%;position:relative}
.divider::before{
    content:"OR";
    position:absolute;top:50%;left:50%;
    transform:translate(-50%,-50%);
    background:var(--background);
    padding:0 1rem;
    font-weight:bold
}

/* inputs */
.input-group{margin:.5rem 0}
select,input[type=text]{
    width:100%;
    padding:1rem;
    border:2px solid var(--accent);
    border-radius:8px;
    font-size:1rem;
    margin:.5rem 0;
    background:var(--card-bg);
    color:var(--text)
}

/* buttons */
button{
    background:linear-gradient(45deg,var(--primary),var(--secondary));
    color:#fff;border:none;
    padding:1.2rem 2.5rem;
    border-radius:12px;
    font-size:1.2rem;
    cursor:pointer;
    width:100%;
    margin-top:1rem;
    transition:filter .2s
}
button:hover{filter:brightness(.9)}

/* loader */
.loader{position:fixed;inset:0;background:rgba(255,255,255,.9);
        display:none;justify-content:center;align-items:center;z-index:1000}
.loader-spinner{width:50px;height:50px;border:5px solid #f3f3f3;
                border-top:5px solid var(--primary);border-radius:50%;
                animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* results section */
.results{display:none;margin-top:2rem;animation:fadeIn .5s}
@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.results h3{font-size:1.45rem;color:var(--primary);margin-bottom:1rem}

/* forecast cards */
.forecast-card{
    background:var(--card-bg);
    border-radius:12px;
    padding:1.5rem;
    margin:1rem 0;
    box-shadow:0 4px 6px rgba(0,0,0,.05);
    border-left:4px solid var(--accent)
}
.status-label{font-weight:700;margin-bottom:.8rem}
.status-label.snow{color:#B71C1C}
.status-label.clear{color:#00796B}

.progress-wrap{
    background:#e0e0e0;
    border-radius:6px;
    height:10px;
    margin-top:.6rem;
    overflow:hidden
}
.progress-fill{
    height:100%;
    background:linear-gradient(90deg,var(--secondary),var(--accent));
    width:0%
}

/* advertisement placeholder */
.ad-space{
    height:100px;
    background:rgba(0,0,0,.05);
    margin:2rem 0;
    border-radius:8px;
    display:flex;align-items:center;justify-content:center;
    opacity:.8;color:var(--text)
}

/* FAQ */
.faq-item{margin:.5rem 0;background:var(--card-bg);
          border-radius:8px;box-shadow:0 2px 4px rgba(0,0,0,.05)}
.faq-question{padding:1rem;cursor:pointer;display:flex;justify-content:space-between}
.faq-answer{display:none;padding:0 1rem 1rem;border-top:1px solid var(--accent)}
.hidden-section{display:none !important;height:0;overflow:hidden}

/* ======= Mobile Improvements ======= */
@media(max-width:768px){
    .header{padding:1rem}
    .header h1{font-size:1.75rem}
    .container{margin:1rem auto;padding:0 0.5rem}
    .calculator-card{padding:1.5rem;margin:1rem 0}
    .input-section{grid-template-columns:1fr;grid-template-rows:auto 1px auto;gap:1.5rem}
    .divider{width:100%;height:1px}
    select,input[type=text]{padding:0.875rem;font-size:16px}
    button{padding:1rem 2rem;font-size:1.1rem}
    .forecast-card{padding:1.25rem}
    .ad-space{height:80px;margin:1.5rem 0}
}

@media(max-width:480px){
    .header h1{font-size:1.5rem}
    .calculator-card{padding:1rem;border-radius:16px}
    .input-note{font-size:1rem}
    select,input[type=text]{padding:0.75rem}
    button{padding:0.875rem 1.5rem;font-size:1rem}
}