/* ═══════════════════════════════════════════════════════
   PATIENT SAFETY 101  —  Shared Stylesheet
   Pages: index, books, cascade, training, speaking,
          insights, about, contact + article detail pages
═══════════════════════════════════════════════════════ */

/* ── TOKENS ─────────────────────────────────────────── */
:root {
  --teal-dark:   #0B4F5E;
  --teal:        #0E6B80;
  --teal-mid:    #1A8FA8;
  --teal-light:  #E8F4F7;
  --teal-xlight: #F2F9FB;
  --navy:        #0D2B3E;
  --navy-mid:    #1B3D52;
  --coral:       #C4566A;
  --coral-light: #F9EDF0;
  --white:       #FFFFFF;
  --grey-50:     #F8FAFB;
  --grey-100:    #EEF2F5;
  --grey-200:    #D8E2E8;
  --grey-400:    #8FA3B0;
  --grey-600:    #4A6070;
  --text-body:   #2D3F4C;
  --text-muted:  #5A7280;
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   18px;
  --shadow-sm:   0 1px 4px rgba(11,79,94,.08);
  --shadow-md:   0 4px 20px rgba(11,79,94,.12);
  --shadow-lg:   0 12px 40px rgba(11,79,94,.16);
  --transition:  .2s ease;
  --max-width:   1160px;
}

/* ── RESET ───────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

html{
  scroll-behavior:smooth;
  /* Always reserve space for the scrollbar — prevents the layout
     shifting left/right when navigating between short and tall pages */
  overflow-y:scroll;
  scrollbar-gutter:stable;
}

body{
  font-family:'Inter',Arial,sans-serif;font-size:16px;line-height:1.7;
  color:var(--text-body);background:var(--white);-webkit-font-smoothing:antialiased;
  /* Fade-in on every page load — masks the hard cut between pages */
  animation:ps101-fadein .22s ease both;
}

/* Page fade-in keyframe */
@keyframes ps101-fadein{
  from{opacity:0;transform:translateY(5px)}
  to  {opacity:1;transform:translateY(0)}
}

/* Page fade-out class — added by nav.js on link click */
body.is-leaving{
  opacity:0;
  transform:translateY(-3px);
  transition:opacity .15s ease, transform .15s ease;
  pointer-events:none;
}

img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ── UTILITY ─────────────────────────────────────────── */
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-alt{background:var(--grey-50)}
.section-dark{background:var(--navy);color:var(--white)}
.section-teal{background:var(--teal-xlight)}

.section-label{display:inline-block;font-size:.75rem;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;color:var(--teal-mid);
  background:var(--teal-light);padding:4px 12px;border-radius:100px;margin-bottom:16px}
.section-dark .section-label{color:var(--teal-mid);background:rgba(14,107,128,.2)}

h1,h2,h3,h4{font-family:'Merriweather',Georgia,serif;line-height:1.25;color:var(--navy)}
.section-dark h1,.section-dark h2,.section-dark h3{color:var(--white)}
h1{font-size:clamp(1.9rem,4.5vw,3rem)}
h2{font-size:clamp(1.4rem,3vw,2rem);margin-bottom:14px}
h3{font-size:1.1rem;margin-bottom:8px}

.lead{font-size:1.05rem;color:var(--text-muted);max-width:680px;line-height:1.75}
.section-dark p,.section-dark li{color:rgba(255,255,255,.82)}

/* ── BUTTONS ─────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;
  border-radius:var(--radius-sm);font-family:'Inter',sans-serif;font-size:.9rem;
  font-weight:600;cursor:pointer;border:2px solid transparent;
  transition:all var(--transition);text-decoration:none;white-space:nowrap}
.btn-primary{background:var(--teal);color:var(--white);border-color:var(--teal)}
.btn-primary:hover{background:var(--teal-dark);border-color:var(--teal-dark);
  transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-outline{background:transparent;color:var(--white);border-color:rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.1);border-color:var(--white)}
.btn-outline-dark{background:transparent;color:var(--teal);border-color:var(--teal)}
.btn-outline-dark:hover{background:var(--teal);color:var(--white)}
.btn-coral{background:var(--coral);color:var(--white);border-color:var(--coral)}
.btn-coral:hover{background:#a8435a;border-color:#a8435a;
  transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-sm{padding:9px 18px;font-size:.82rem}

/* ── TOPBAR ──────────────────────────────────────────── */
.topbar{
  background:var(--navy);color:rgba(255,255,255,.7);font-size:.78rem;
  text-align:center;padding:0 16px;letter-spacing:.02em;
  /* Fixed height prevents any reflow when content differs between pages */
  height:36px;
  display:flex;align-items:center;justify-content:center;
}
.topbar a{color:var(--coral);font-weight:600}

/* ── NAVIGATION ──────────────────────────────────────── */
nav{
  position:sticky;top:0;z-index:100;background:var(--white);
  border-bottom:1px solid var(--grey-200);box-shadow:var(--shadow-sm);
  transition:box-shadow var(--transition);
  /* Explicit height prevents any reflow-based vertical movement */
  height:64px;
  /* Promote to its own compositor layer — avoids repaints affecting other elements */
  will-change:box-shadow;
  /* Contain layout changes inside the nav */
  contain:layout style;
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  /* Match nav height exactly so nothing overflows */
  height:64px;
  padding:0 24px;max-width:var(--max-width);margin:0 auto;gap:24px;
}
.nav-logo{display:flex;flex-direction:column;gap:1px;text-decoration:none}
.nav-logo-main{font-family:'Merriweather',serif;font-size:1.05rem;font-weight:700;
  color:var(--teal-dark);line-height:1.1}
.nav-logo-sub{font-size:.68rem;color:var(--grey-400);letter-spacing:.04em;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{font-size:.86rem;font-weight:500;color:var(--grey-600);
  padding:6px 12px;border-radius:var(--radius-sm);transition:all var(--transition)}
.nav-links a:hover,.nav-links a.active{color:var(--teal);background:var(--teal-xlight)}
.nav-cta{flex-shrink:0}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;
  padding:8px;background:none;border:none;border-radius:var(--radius-sm)}
.hamburger span{width:22px;height:2px;background:var(--navy);border-radius:2px;
  transition:all .3s;display:block}
.mobile-menu{display:none;flex-direction:column;padding:8px 24px 20px;
  border-top:1px solid var(--grey-100);gap:2px}
.mobile-menu.open{display:flex}
.mobile-menu a{font-size:.9rem;font-weight:500;color:var(--grey-600);
  padding:10px 12px;border-radius:var(--radius-sm)}
.mobile-menu a:hover{background:var(--teal-xlight);color:var(--teal)}
.mobile-menu .btn{margin-top:8px;justify-content:center}

/* ── PAGE HERO (inner pages) ─────────────────────────── */
.page-hero{background:linear-gradient(155deg,var(--navy) 0%,var(--teal-dark) 100%);
  color:var(--white);padding:64px 0 56px}
.page-hero h1{color:var(--white);margin-bottom:14px}
.page-hero .lead{color:rgba(255,255,255,.78)}
.breadcrumb{font-size:.78rem;color:rgba(255,255,255,.45);margin-bottom:20px;letter-spacing:.02em}
.breadcrumb a{color:rgba(255,255,255,.55)}
.breadcrumb a:hover{color:var(--white)}
.breadcrumb span{margin:0 6px}

/* ── CREDIBILITY STRIP ───────────────────────────────── */
.cred-strip{background:var(--teal-dark);padding:20px 0}
.cred-strip-inner{display:flex;align-items:center;justify-content:center;
  flex-wrap:wrap;gap:10px 28px;text-align:center}
.cred-item{display:flex;align-items:center;gap:8px;font-size:.8rem;
  color:rgba(255,255,255,.75);white-space:nowrap}
.cred-item svg{flex-shrink:0;opacity:.6}
.cred-item strong{color:var(--white)}
.cred-divider{width:1px;height:20px;background:rgba(255,255,255,.2)}

/* ── BOOK CARDS ──────────────────────────────────────── */
.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:24px}
.books-grid-3{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.book-card{background:var(--white);border:1px solid var(--grey-200);border-radius:var(--radius-md);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition);
  display:flex;flex-direction:column}
.book-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--teal-mid)}
.book-cover{aspect-ratio:3/4;background:linear-gradient(145deg,var(--teal-light),var(--grey-100));
  display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.book-cover img{width:100%;height:100%;object-fit:cover}
.book-badge{position:absolute;top:10px;right:10px;background:var(--coral);color:var(--white);
  font-size:.65rem;font-weight:700;padding:3px 8px;border-radius:100px;
  letter-spacing:.06em;text-transform:uppercase}
.book-body{padding:20px;flex:1;display:flex;flex-direction:column}
.book-tag{font-size:.7rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.1em;color:var(--teal-mid);margin-bottom:6px}
.book-body h3{font-size:1rem;color:var(--navy);margin-bottom:6px}
.book-tagline{font-size:.8rem;font-weight:600;color:var(--coral);margin-bottom:8px;font-style:italic}
.book-body p{font-size:.82rem;color:var(--text-muted);line-height:1.6;flex:1}
.book-footer{margin-top:16px;display:flex;gap:8px;flex-wrap:wrap}
.book-footer .btn{flex:1;justify-content:center}

/* ── ARTICLE CARDS ───────────────────────────────────── */
.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.article-card{background:var(--white);border:1px solid var(--grey-200);
  border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-sm);
  transition:all var(--transition);display:flex;flex-direction:column;text-decoration:none}
.article-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--teal-mid)}
.article-pub-badge{display:inline-flex;align-items:center;gap:6px;
  font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  padding:3px 10px;border-radius:100px;margin-bottom:12px}
.badge-rcni{background:#e8f0fb;color:#1a4fa0;border:1px solid #c0d4f5}
.badge-nt{background:#fdf0e8;color:#a04a1a;border:1px solid #f5d4c0}
.badge-linkedin{background:#e8f4fb;color:#1a6ea0;border:1px solid #c0ddf5}
.badge-psl{background:#e8fbf0;color:#1a7a40;border:1px solid #c0f5d4}
.article-card h3{font-size:.98rem;color:var(--navy);margin-bottom:8px;line-height:1.4}
.article-card p{font-size:.83rem;color:var(--text-muted);line-height:1.65;flex:1}
.article-card .read-link{display:inline-flex;align-items:center;gap:6px;
  margin-top:14px;font-size:.82rem;font-weight:600;color:var(--teal)}
.article-card:hover .read-link{gap:10px}
.article-meta{display:flex;align-items:center;gap:12px;margin-top:12px;
  padding-top:12px;border-top:1px solid var(--grey-100)}
.article-date{font-size:.75rem;color:var(--grey-400)}

/* ── FILTER TABS ─────────────────────────────────────── */
.filter-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:36px}
.filter-tab{padding:7px 18px;border-radius:100px;font-size:.82rem;font-weight:600;
  border:1.5px solid var(--grey-200);background:var(--white);color:var(--grey-600);
  cursor:pointer;transition:all var(--transition)}
.filter-tab:hover{border-color:var(--teal-mid);color:var(--teal)}
.filter-tab.active{background:var(--teal);color:var(--white);border-color:var(--teal)}

/* ── CASCADE PILLARS ─────────────────────────────────── */
.cascade-pillars{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:32px}
.pillar{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-md);padding:20px}
.pillar-icon{width:36px;height:36px;background:var(--teal-mid);border-radius:8px;
  display:flex;align-items:center;justify-content:center;margin-bottom:10px}
.pillar h4{font-family:'Inter',sans-serif;font-size:.9rem;font-weight:700;
  color:var(--white);margin-bottom:4px}
.pillar p{font-size:.78rem;color:rgba(255,255,255,.6);line-height:1.5}

/* ── TRAINING CARDS ──────────────────────────────────── */
.training-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.training-card{background:var(--white);border:1px solid var(--grey-200);
  border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-sm);transition:all var(--transition)}
.training-card:hover{border-color:var(--teal-mid);box-shadow:var(--shadow-md)}
.training-icon{width:44px;height:44px;background:var(--teal-light);border-radius:10px;
  display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.training-card h3{font-size:1rem;color:var(--navy)}
.training-card p{font-size:.84rem;color:var(--text-muted);margin-top:6px}

/* ── FORM ────────────────────────────────────────────── */
.form-group{margin-bottom:14px}
.form-group label{display:block;font-size:.8rem;font-weight:600;
  color:var(--grey-600);margin-bottom:6px}
.form-group input,.form-group textarea,.form-group select{
  width:100%;padding:11px 14px;border:1.5px solid var(--grey-200);
  border-radius:var(--radius-sm);font-family:'Inter',sans-serif;font-size:.9rem;
  color:var(--text-body);background:var(--white);transition:border-color var(--transition);outline:none}
.form-group textarea{resize:vertical;min-height:120px}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{border-color:var(--teal-mid)}
.form-disclaimer{font-size:.72rem;color:var(--grey-400);margin-top:10px;line-height:1.5}
.form-disclaimer a{color:var(--teal);text-decoration:underline}
.form-box{background:var(--white);border:1px solid var(--grey-200);
  border-radius:var(--radius-lg);padding:40px;box-shadow:var(--shadow-md)}

/* ── FAQ ─────────────────────────────────────────────── */
.faq-grid{max-width:780px;margin:48px auto 0}
.faq-item{border:1px solid var(--grey-200);border-radius:var(--radius-md);margin-bottom:10px;overflow:hidden}
.faq-question{width:100%;background:var(--white);border:none;padding:18px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer;
  font-family:'Inter',sans-serif;font-size:.92rem;font-weight:600;color:var(--navy);
  text-align:left;transition:background var(--transition)}
.faq-question:hover{background:var(--grey-50)}
.faq-question.open{background:var(--teal-xlight);color:var(--teal-dark)}
.faq-chevron{flex-shrink:0;transition:transform .3s}
.faq-question.open .faq-chevron{transform:rotate(180deg)}
.faq-answer{display:none;padding:0 22px 18px;background:var(--teal-xlight);
  font-size:.88rem;color:var(--text-muted);line-height:1.7}
.faq-answer.open{display:block}

/* ── CTA SECTION ─────────────────────────────────────── */
.cta-section{background:linear-gradient(135deg,var(--teal-dark) 0%,var(--navy) 100%);
  padding:80px 0;text-align:center}
.cta-section h2{color:var(--white);font-size:clamp(1.5rem,3.5vw,2.3rem);margin-bottom:14px}
.cta-section .lead{color:rgba(255,255,255,.75);margin:0 auto 36px}
.cta-buttons{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}

/* ── FOOTER ──────────────────────────────────────────── */
footer{background:var(--navy);color:rgba(255,255,255,.65);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-brand .nav-logo-main{font-size:1.1rem;color:var(--white);margin-bottom:10px;display:block}
.footer-brand p{font-size:.83rem;line-height:1.7;max-width:260px}
.footer-social{display:flex;gap:10px;margin-top:20px}
.social-link{width:36px;height:36px;background:rgba(255,255,255,.08);border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  transition:background var(--transition);color:rgba(255,255,255,.6)}
.social-link:hover{background:var(--teal-mid);color:var(--white)}
.footer-col h4{font-family:'Inter',sans-serif;font-size:.8rem;font-weight:700;
  text-transform:uppercase;letter-spacing:.1em;color:var(--white);margin-bottom:16px}
.footer-col ul{display:flex;flex-direction:column;gap:8px}
.footer-col a{font-size:.83rem;color:rgba(255,255,255,.55);transition:color var(--transition)}
.footer-col a:hover{color:var(--white)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:.78rem}
.footer-bottom-links{display:flex;gap:20px}
.footer-bottom-links a{font-size:.78rem;color:rgba(255,255,255,.45);transition:color var(--transition)}
.footer-bottom-links a:hover{color:var(--white)}

/* ── ABOUT / CREDENTIALS ─────────────────────────────── */
.credential{display:flex;align-items:center;gap:10px;font-size:.88rem;color:var(--text-body)}
.credential::before{content:'';width:8px;height:8px;background:var(--teal-mid);
  border-radius:50%;flex-shrink:0}
.about-credentials{display:flex;flex-direction:column;gap:8px;margin:24px 0 28px}

/* ── SPEAKING FORMATS ────────────────────────────────── */
.pill{font-size:.78rem;font-weight:600;padding:5px 14px;border-radius:100px;
  background:var(--white);color:var(--teal-dark);border:1px solid var(--grey-200)}

/* ── RESPONSIVE ──────────────────────────────────────── */
@media(max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .cascade-pillars{grid-template-columns:1fr}
}
@media(max-width:640px){
  .section{padding:56px 0}
  .nav-links,.nav-cta{display:none}
  .hamburger{display:flex}
  .books-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .articles-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .cta-buttons{flex-direction:column;align-items:center}
}
@media(max-width:400px){
  .books-grid{grid-template-columns:1fr}
}

/* ── JS HIDE CLASS ───────────────────────────────────── */
.hidden{display:none!important}