/* =========================================================
   CASE STUDY INTRODUCTION
   Scoped to prevent collisions with site/article styles
   ========================================================= */

.case-study-intro{
    font-family:Inter,system-ui,sans-serif;
    color:var(--ink);
    line-height:1.7;
    max-width:920px;
}

.case-study-intro *,
.case-study-intro *::before,
.case-study-intro *::after{
    box-sizing:border-box;
}

/* ---------- Intro ---------- */

.case-study-intro__header{
    position:relative;
    overflow:hidden;
    margin:0 0 42px;
    padding:34px 36px;
    background:
        linear-gradient(
            135deg,
            var(--white) 0%,
            var(--cream) 58%,
            var(--soft) 100%
        );
    border:1px solid var(--line);
    border-top:6px solid var(--red);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
}

.case-study-intro__header::after{
    content:"";
    position:absolute;
    width:230px;
    height:230px;
    right:-100px;
    top:-120px;
    border:42px solid rgba(171,3,3,.05);
    border-radius:50%;
    pointer-events:none;
}

.case-study-intro__eyebrow{
    position:relative;
    z-index:1;
    display:block;
    margin-bottom:9px;
    color:var(--red);
    font-size:12px;
    line-height:1.4;
    font-weight:800;
    letter-spacing:.13em;
    text-transform:uppercase;
}

.case-study-intro__title{
    position:relative;
    z-index:1;
    max-width:780px;
    margin:0 0 16px;
    color:var(--navy);
    font-size:clamp(32px,5vw,48px);
    line-height:1.07;
    letter-spacing:-.04em;
}

.case-study-intro__lead{
    position:relative;
    z-index:1;
    max-width:790px;
    margin:0;
    color:var(--slate);
    font-size:18px;
    line-height:1.65;
}

/* ---------- Summary/evidence bar ---------- */

.case-study-intro__summary{
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:14px;
    margin:26px 0 0;
}

.case-study-intro__stat{
    padding:17px 18px;
    background:rgba(255,255,255,.9);
    border:1px solid var(--line);
    border-radius:12px;
}

.case-study-intro__stat strong{
    display:block;
    margin-bottom:2px;
    color:var(--navy);
    font-size:18px;
    line-height:1.25;
}

.case-study-intro__stat span{
    display:block;
    color:var(--slate);
    font-size:12px;
    line-height:1.4;
}

/* ---------- Main sections ---------- */

.case-study-intro__section{
    position:relative;
    margin:0 0 46px;
}

.case-study-intro__section h2{
    margin:0 0 16px;
    color:var(--navy);
    font-size:clamp(27px,3.5vw,36px);
    line-height:1.14;
    letter-spacing:-.03em;
}

.case-study-intro__section h3{
    margin:26px 0 9px;
    color:var(--navy);
    font-size:20px;
    line-height:1.3;
}

.case-study-intro__section p{
    margin:0 0 17px;
}

.case-study-intro__section ul,
.case-study-intro__section ol{
    margin:0 0 18px;
    padding-left:24px;
}

.case-study-intro__section li{
    margin:7px 0;
}

/* ---------- Timeline ---------- */

.case-study-intro__timeline{
    position:relative;
    margin:8px 0 48px;
    padding-left:33px;
}

.case-study-intro__timeline::before{
    content:"";
    position:absolute;
    left:9px;
    top:9px;
    bottom:10px;
    width:2px;
    background:var(--line);
}

.case-study-intro__event{
    position:relative;
    margin:0 0 34px;
    padding:24px 25px;
    background:var(--white);
    border:1px solid var(--line);
    border-radius:14px;
    box-shadow:0 6px 22px rgba(23,50,77,.05);
}

.case-study-intro__event:last-child{
    margin-bottom:0;
}

.case-study-intro__event::before{
    content:"";
    position:absolute;
    left:-31px;
    top:27px;
    width:14px;
    height:14px;
    border:4px solid var(--white);
    border-radius:50%;
    background:var(--teal);
    box-shadow:0 0 0 2px var(--teal);
}

.case-study-intro__event--major::before{
    background:var(--red);
    box-shadow:0 0 0 2px var(--red);
}

.case-study-intro__event--major{
    border-top:4px solid var(--red);
}

.case-study-intro__date{
    display:inline-block;
    margin-bottom:10px;
    padding:5px 10px;
    color:var(--teal);
    background:var(--soft);
    border-radius:999px;
    font-size:11px;
    line-height:1.3;
    font-weight:800;
    letter-spacing:.06em;
    text-transform:uppercase;
}

.case-study-intro__event--major .case-study-intro__date{
    color:var(--red);
    background:#fff2f2;
}

.case-study-intro__event h2{
    margin:0 0 13px;
    font-size:25px;
    line-height:1.2;
}

.case-study-intro__event p:last-child{
    margin-bottom:0;
}

/* ---------- Quotes ---------- */

.case-study-intro__quote{
    margin:20px 0;
    padding:17px 20px;
    color:var(--ink);
    background:var(--cream);
    border-left:5px solid var(--teal);
    border-radius:0 10px 10px 0;
    font-size:16px;
}

.case-study-intro__quote p{
    margin:0;
}

.case-study-intro__quote strong{
    color:var(--navy);
}

/* ---------- Callouts ---------- */

.case-study-intro__callout{
    margin:24px 0;
    padding:22px 24px;
    border-radius:14px;
}

.case-study-intro__callout h3{
    margin:0 0 8px;
    font-size:19px;
}

.case-study-intro__callout p:last-child{
    margin-bottom:0;
}

.case-study-intro__callout--evidence{
    background:var(--soft);
    border-left:5px solid var(--teal);
}

.case-study-intro__callout--management{
    background:#fff8e9;
    border-left:5px solid var(--gold);
}

.case-study-intro__callout--serious{
    background:#fff2f2;
    border-left:5px solid var(--red);
}

.case-study-intro__callout--conclusion{
    background:var(--cream);
    border:1px solid var(--line);
    border-top:5px solid var(--navy);
}

/* ---------- Evidence cards ---------- */

.case-study-intro__evidence-grid{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:15px;
    margin:23px 0;
}

.case-study-intro__evidence-card{
    padding:21px;
    background:var(--white);
    border:1px solid var(--line);
    border-radius:14px;
    box-shadow:0 5px 18px rgba(23,50,77,.045);
}

.case-study-intro__evidence-card strong{
    display:block;
    margin-bottom:5px;
    color:var(--navy);
    font-size:16px;
}

.case-study-intro__evidence-card p{
    margin:0;
    color:var(--slate);
    font-size:14px;
}

/* ---------- Question / transition block ---------- */

.case-study-intro__question{
    margin:28px 0;
    padding:27px 28px;
    background:var(--navy);
    border-radius:14px;
    color:var(--white);
}

.case-study-intro__question .case-study-intro__question-label{
    display:block;
    margin-bottom:7px;
    color:#c4eceb;
    font-size:11px;
    font-weight:800;
    letter-spacing:.1em;
    text-transform:uppercase;
}

.case-study-intro__question p{
    margin:0;
    color:var(--white);
    font-size:clamp(19px,2.5vw,24px);
    line-height:1.4;
    font-weight:700;
}

/* ---------- Closing ---------- */

.case-study-intro__next{
    margin:48px 0 0;
    padding:30px;
    color:var(--white);
    background:var(--navy);
    border-radius:var(--radius);
}

.case-study-intro__next h2{
    margin:0 0 12px;
    color:var(--white);
}

.case-study-intro__next p{
    color:#d8e2ea;
}

.case-study-intro__next ol{
    margin-bottom:20px;
}

.case-study-intro__next strong{
    color:var(--white);
}

/* ---------- Responsive ---------- */

@media(max-width:720px){

    .case-study-intro__header{
        padding:27px 23px;
    }

    .case-study-intro__lead{
        font-size:16px;
    }

    .case-study-intro__summary{
        grid-template-columns:1fr;
    }

    .case-study-intro__timeline{
        padding-left:26px;
    }

    .case-study-intro__timeline::before{
        left:6px;
    }

    .case-study-intro__event{
        padding:21px 19px;
    }

    .case-study-intro__event::before{
        left:-26px;
    }

    .case-study-intro__evidence-grid{
        grid-template-columns:1fr;
    }

    .case-study-intro__question,
    .case-study-intro__next{
        padding:23px 21px;
    }
}

.text-16-bold {
    font-size:16px;
    font-weight:700;
}

/* =========================================================
   AIR QUALITY SAFETY GUIDE
   ========================================================= */

.aq-safety-guide{
    position:relative;
    margin:38px 0 44px;
    padding:32px;
    background:#fff;
    border:4px solid var(--red);
    border-radius:var(--radius);
    box-shadow:
        0 12px 35px rgba(23,50,77,.10),
        0 0 0 7px rgba(171,3,3,.06);
}


/* HEADER */

.aq-safety-guide__header{
    margin-bottom:28px;
    text-align:center;
}

.aq-safety-guide__alert{
    display:inline-block;
    margin-bottom:14px;
    padding:8px 14px;
    background:var(--red);
    color:#fff;
    border-radius:8px;
    font-size:12px;
    font-weight:800;
    letter-spacing:.08em;
    text-transform:uppercase;
}

.aq-safety-guide__header h2{
    margin:0 0 14px;
    color:var(--navy);
    font-size:clamp(30px,4vw,42px);
    line-height:1.1;
    letter-spacing:-.03em;
}

.aq-safety-guide__header p{
    max-width:800px;
    margin:0 auto 12px;
    font-size:16px;
}


/* POLLUTANT CARDS */

.aq-safety-guide__pollutants{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:20px;
}

.aq-safety-guide__pollutant{
    padding:25px;
    border:1px solid var(--line);
    border-radius:14px;
    background:#fff;
}

.aq-safety-guide__pollutant--hcho{
    border-top:6px solid var(--red);
}

.aq-safety-guide__pollutant--tvoc{
    border-top:6px solid var(--teal);
}

.aq-safety-guide__pollutant-heading{
    display:flex;
    align-items:center;
    gap:14px;
    margin-bottom:18px;
}

.aq-safety-guide__chemical{
    flex:0 0 auto;
    display:grid;
    place-items:center;
    min-width:76px;
    min-height:58px;
    padding:9px 12px;
    background:var(--navy);
    color:#fff;
    border-radius:10px;
    font-size:20px;
    font-weight:800;
}

.aq-safety-guide__pollutant-heading h3{
    margin:0 0 2px;
    color:var(--navy);
    font-size:20px;
}

.aq-safety-guide__subtitle{
    display:block;
    color:var(--slate);
    font-size:12px;
    line-height:1.4;
}

.aq-safety-guide__pollutant p{
    margin:0 0 15px;
}


/* NORMAL VS SAFE */

.aq-safety-guide__comparison{
    display:grid;
    grid-template-columns:1fr auto 1fr;
    gap:12px;
    align-items:center;
    margin:23px 0 17px;
}

.aq-safety-guide__reading{
    min-height:145px;
    padding:17px 12px;
    display:flex;
    flex-direction:column;
    justify-content:center;
    text-align:center;
    border-radius:12px;
}

.aq-safety-guide__reading--normal{
    background:var(--soft);
    border:2px solid var(--teal);
}

.aq-safety-guide__reading--safe-limit{
    background:#fff2f2;
    border:2px solid var(--red);
}

.aq-safety-guide__reading-label{
    min-height:34px;
    margin-bottom:8px;
    color:var(--slate);
    font-size:10px;
    line-height:1.35;
    font-weight:800;
    letter-spacing:.05em;
    text-transform:uppercase;
}

.aq-safety-guide__reading strong{
    display:block;
    color:var(--teal);
    font-size:42px;
    line-height:1;
    font-weight:800;
}

.aq-safety-guide__reading--safe-limit strong{
    color:var(--red);
}

.aq-safety-guide__units{
    display:block;
    margin-top:6px;
    color:var(--slate);
    font-size:13px;
    font-weight:700;
}

.aq-safety-guide__arrow{
    color:var(--navy);
    font-size:24px;
    font-weight:800;
}


/* SAFE LEVEL STATEMENT */

.aq-safety-guide__safe-statement{
    padding:16px 17px;
    background:#fff8e9;
    border-left:5px solid var(--gold);
    border-radius:0 10px 10px 0;
    font-size:14px;
}

.aq-safety-guide__safe-statement > strong:first-child{
    color:var(--navy);
}


/* CIGARETTE / VAPING CONNECTION */

.aq-safety-guide__smoke-connection{
    margin-top:24px;
    padding:24px;
    background:var(--soft);
    border:1px solid var(--line);
    border-radius:14px;
}

.aq-safety-guide__smoke-connection h3{
    margin:0 0 18px;
    color:var(--navy);
    font-size:21px;
}

.aq-safety-guide__connection-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
}

.aq-safety-guide__connection-grid > div{
    padding:18px;
    background:#fff;
    border-radius:12px;
    border:1px solid var(--line);
}

.aq-safety-guide__connection-grid > div > strong{
    display:block;
    margin-bottom:7px;
    color:var(--red);
    font-size:16px;
}

.aq-safety-guide__connection-grid p{
    margin:0;
    font-size:14px;
}


/* NORMAL BASELINE */

.aq-safety-guide__baseline{
    margin-top:24px;
    padding:24px;
    background:var(--navy);
    color:#fff;
    border-radius:14px;
    text-align:center;
}

.aq-safety-guide__baseline-title{
    display:block;
    margin-bottom:15px;
    color:#c4eceb;
    font-size:12px;
    font-weight:800;
    letter-spacing:.1em;
}

.aq-safety-guide__baseline-values{
    display:flex;
    justify-content:center;
    gap:46px;
    margin-bottom:16px;
}

.aq-safety-guide__baseline-values div{
    min-width:125px;
}

.aq-safety-guide__baseline-values span{
    display:block;
    font-size:13px;
    font-weight:800;
}

.aq-safety-guide__baseline-values strong{
    display:block;
    margin:3px 0;
    color:#fff;
    font-size:40px;
    line-height:1;
}

.aq-safety-guide__baseline-values small{
    color:#d8e2ea;
}

.aq-safety-guide__baseline p{
    max-width:720px;
    margin:0 auto;
    color:#d8e2ea;
    font-size:14px;
}


/* FINAL WARNING */

.aq-safety-guide__warning{
    display:flex;
    align-items:flex-start;
    gap:18px;
    margin-top:24px;
    padding:24px;
    background:#fff2f2;
    border:2px solid var(--red);
    border-radius:14px;
}

.aq-safety-guide__warning-icon{
    flex:0 0 44px;
    display:grid;
    place-items:center;
    width:44px;
    height:44px;
    background:var(--red);
    color:#fff;
    border-radius:50%;
    font-size:27px;
    font-weight:800;
}

.aq-safety-guide__warning h3{
    margin:0 0 9px;
    color:var(--red-dark);
    font-size:20px;
}

.aq-safety-guide__warning p{
    margin:0 0 8px;
    color:var(--ink);
}

.aq-safety-guide__warning p:last-child{
    margin-bottom:0;
}


/* EVIDENTIARY NOTE */

.aq-safety-guide__important-note{
    margin-top:18px;
    padding:15px 17px;
    background:var(--cream);
    border-left:4px solid var(--gold);
    border-radius:0 9px 9px 0;
    color:var(--slate);
    font-size:13px;
}

.aq-safety-guide__important-note strong{
    color:var(--ink);
}


/* MOBILE */

@media(max-width:720px){

    .aq-safety-guide{
        padding:23px 18px;
        border-width:3px;
    }

    .aq-safety-guide__pollutants,
    .aq-safety-guide__connection-grid{
        grid-template-columns:1fr;
    }

}

@media(max-width:480px){

    .aq-safety-guide__comparison{
        grid-template-columns:1fr;
    }

    .aq-safety-guide__arrow{
        transform:rotate(90deg);
        text-align:center;
    }

    .aq-safety-guide__baseline-values{
        gap:24px;
    }

    .aq-safety-guide__warning{
        flex-direction:column;
    }

}