/* =========================================================
   My Exam Secret — Shared Design System
   Single stylesheet, no framework, cached across all pages.
   ========================================================= */

:root{
  --blue-900:#122a5c;
  --blue-800:#173b7a;
  --blue-700:#1e40af;
  --blue-600:#2563eb;
  --blue-500:#3b82f6;
  --blue-100:#dbe7fb;
  --blue-50:#eef4ff;

  --amber-600:#d97706;
  --amber-500:#f59e0b;
  --amber-100:#fef3c7;

  --green-600:#16a34a;
  --green-100:#dcfce7;

  --red-600:#dc2626;
  --red-100:#fee2e2;

  --ink-900:#0f172a;
  --ink-700:#334155;
  --ink-500:#64748b;
  --ink-300:#cbd5e1;
  --ink-100:#f1f5f9;
  --ink-50:#f8fafc;
  --white:#ffffff;

  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:22px;

  --shadow-sm:0 2px 8px rgba(15,23,42,0.06);
  --shadow-md:0 8px 24px rgba(15,23,42,0.10);
  --shadow-lg:0 18px 45px rgba(18,42,92,0.16);

  --maxw:1180px;
  --gap:clamp(1rem,2vw,2rem);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink-900);
  background:var(--white);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4,p{ margin:0 0 .6em; }
h1,h2,h3,h4{ line-height:1.2; letter-spacing:-0.01em; color:var(--blue-900); }
table{ border-collapse:collapse; width:100%; }

.container{ max-width:var(--maxw); margin:0 auto; padding:0 20px; }
.section{ padding:clamp(3rem,6vw,5.5rem) 0; }
.section-tight{ padding:clamp(2rem,4vw,3.5rem) 0; }
.section-alt{ background:var(--blue-50); }
.section-dark{ background:var(--blue-900); color:var(--white); }
.section-dark h1,.section-dark h2,.section-dark h3{ color:var(--white); }

.eyebrow{
  display:inline-block;
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--blue-600);
  background:var(--blue-100);
  padding:.35em .9em;
  border-radius:999px;
  margin-bottom:1em;
}
.tagline{ font-size:1.15rem; color:var(--ink-700); max-width:46ch; }
.center{ text-align:center; margin-inline:auto; }

h1{ font-size:clamp(2rem,4.4vw,3.2rem); }
h2{ font-size:clamp(1.6rem,3vw,2.3rem); }
h3{ font-size:1.25rem; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  font-weight:700;
  font-size:1rem;
  padding:.85em 1.6em;
  border-radius:999px;
  border:2px solid transparent;
  cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{ background:var(--amber-500); color:var(--blue-900); box-shadow:var(--shadow-sm); }
.btn-primary:hover{ background:var(--amber-600); box-shadow:var(--shadow-md); }
.btn-outline{ border-color:var(--white); color:var(--white); }
.btn-outline:hover{ background:rgba(255,255,255,.12); }
.btn-outline-blue{ border-color:var(--blue-600); color:var(--blue-700); }
.btn-outline-blue:hover{ background:var(--blue-50); }
.btn-block{ width:100%; justify-content:center; }

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--ink-100);
}
.nav-row{ display:flex; align-items:center; justify-content:space-between; padding:12px 0; gap:1rem; }
.logo{ display:flex; align-items:center; gap:.5em; font-weight:800; font-size:1.05rem; color:var(--blue-900); white-space:nowrap; flex-shrink:0; }
.logo-mark{ width:32px; height:32px; border-radius:8px; background:linear-gradient(140deg,var(--blue-600),var(--blue-900)); display:flex; align-items:center; justify-content:center; color:#fff; font-weight:800; font-size:.9rem; flex-shrink:0; }

.nav-links{ display:flex; align-items:center; gap:.15rem; }
.nav-links > li{ position:relative; }
.nav-links a{ display:block; font-size:.88rem; font-weight:600; color:var(--ink-700); padding:.5em .65em; white-space:nowrap; border-radius:6px; transition:color .15s, background .15s; }
.nav-links > li > a{ border-bottom:2px solid transparent; border-radius:6px 6px 0 0; }
.nav-links a:hover{ color:var(--blue-700); background:var(--blue-50); }
.nav-links > li > a.active{ color:var(--blue-700); border-color:var(--amber-500); }
.nav-cta{ display:flex; align-items:center; gap:.7rem; flex-shrink:0; }

.dropdown-toggle{ display:flex; align-items:center; gap:.3em; cursor:pointer; }
.dropdown-toggle .chevron{ width:10px; height:10px; flex-shrink:0; transition:transform .15s ease; }
.dropdown.open .dropdown-toggle .chevron{ transform:rotate(180deg); }

.dropdown-menu{
  position:absolute; top:100%; left:0; margin-top:4px;
  min-width:190px; background:var(--white);
  border:1px solid var(--ink-100); border-radius:var(--radius-sm);
  box-shadow:var(--shadow-md); padding:.4rem;
  display:none; flex-direction:column; gap:.1rem;
  z-index:50;
}
.dropdown-menu a{ padding:.55em .7em; color:var(--ink-700); }
.dropdown-menu a:hover{ background:var(--blue-50); color:var(--blue-700); }
.dropdown.open .dropdown-menu{ display:flex; }
@media (hover:hover) and (min-width:901px){
  .dropdown:hover .dropdown-menu{ display:flex; }
}

.nav-toggle{ display:none; background:none; border:none; padding:8px; cursor:pointer; flex-shrink:0; }
.nav-toggle span{ display:block; width:24px; height:2.5px; background:var(--blue-900); margin:5px 0; border-radius:2px; }

@media (max-width:900px){
  .nav-links{
    position:absolute; top:100%; left:0; right:0;
    flex-direction:column; align-items:flex-start; gap:0;
    background:var(--white); border-bottom:1px solid var(--ink-100);
    max-height:0; overflow:hidden; transition:max-height .25s ease;
    box-shadow:var(--shadow-md);
  }
  .nav-links.open{ max-height:80vh; overflow-y:auto; }
  .nav-links > li{ width:100%; }
  .nav-links a{ width:100%; padding:.9em 20px; border-bottom:1px solid var(--ink-100); border-radius:0 !important; }
  .nav-links > li > a.active{ background:var(--blue-50); }
  .dropdown-menu{
    position:static; margin-top:0; min-width:0; border:none; box-shadow:none;
    padding:0; background:var(--ink-50); display:none;
  }
  .dropdown.open .dropdown-menu{ display:flex; }
  .dropdown-menu a{ padding:.8em 20px 0.8em 36px; border-bottom:1px solid var(--ink-100); }
  .nav-cta .btn-primary-desktop{ display:none; }
  .nav-toggle{ display:block; }
}

/* ---------- Hero ---------- */
.hero{ padding:clamp(2.5rem,6vw,4.5rem) 0 clamp(2rem,5vw,3.5rem); }
.hero-grid{ display:grid; grid-template-columns:1.1fr 1fr; gap:clamp(1.5rem,4vw,3rem); align-items:center; }
.hero-media{ border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-lg); aspect-ratio:4/3; background:linear-gradient(140deg,var(--blue-600),var(--blue-900)); }
.hero-media img{ width:100%; height:100%; object-fit:cover; }
.hero-actions{ display:flex; gap:1rem; flex-wrap:wrap; margin-top:1.6rem; }
.hero-stats{ display:flex; gap:2rem; margin-top:2rem; flex-wrap:wrap; }
.hero-stats .stat b{ display:block; font-size:1.5rem; color:var(--blue-700); }
.hero-stats .stat span{ font-size:.85rem; color:var(--ink-500); }

@media (max-width:820px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-media{ order:-1; aspect-ratio:16/10; }
}

/* ---------- Page banner (non-home hero) ---------- */
.page-banner{ padding:clamp(2.6rem,6vw,4rem) 0; text-align:center; }
.page-banner .tagline{ margin-inline:auto; }

/* ---------- Feature strip ---------- */
.feature-strip{ display:grid; grid-template-columns:repeat(5,1fr); gap:1rem; }
.feature-item{ text-align:center; padding:1.4rem 1rem; border-radius:var(--radius-md); background:var(--white); box-shadow:var(--shadow-sm); }
.feature-item .icon{ width:46px; height:46px; margin:0 auto .7rem; color:var(--blue-600); }
.feature-item p{ font-size:.9rem; font-weight:600; color:var(--ink-700); margin:0; }
@media (max-width:900px){ .feature-strip{ grid-template-columns:repeat(2,1fr); } }

/* ---------- Cards / grids ---------- */
.grid{ display:grid; gap:var(--gap); }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }
@media (max-width:900px){ .grid-3,.grid-4{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:640px){ .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; } }

.card{ background:var(--white); border:1px solid var(--ink-100); border-radius:var(--radius-md); padding:1.7rem; box-shadow:var(--shadow-sm); height:100%; }
.card h3{ margin-bottom:.5rem; }
.card p:last-child{ margin-bottom:0; }
.card-icon{ width:42px; height:42px; color:var(--blue-600); margin-bottom:.8rem; }
.card-accent{ border-top:4px solid var(--amber-500); }
.card-accent-blue{ border-top:4px solid var(--blue-600); }

.number-badge{ width:38px; height:38px; border-radius:50%; background:var(--blue-700); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:800; flex-shrink:0; }

/* ---------- Tables ---------- */
.table-wrap{ overflow-x:auto; border-radius:var(--radius-md); box-shadow:var(--shadow-sm); border:1px solid var(--ink-100); }
table.data-table{ min-width:560px; }
table.data-table th,table.data-table td{ padding:.85em 1.1em; text-align:left; font-size:.95rem; border-bottom:1px solid var(--ink-100); }
table.data-table th{ background:var(--blue-900); color:#fff; font-weight:700; white-space:nowrap; }
table.data-table tr:last-child td{ border-bottom:none; }
table.data-table tr:nth-child(even) td{ background:var(--ink-50); }
table.data-table td.highlight{ font-weight:800; color:var(--blue-700); }

.badge-yes{ display:inline-flex; align-items:center; gap:.35em; color:var(--green-600); font-weight:700; }
.badge-warn{ display:inline-flex; align-items:center; gap:.35em; color:var(--amber-600); font-weight:700; }
.badge-no{ display:inline-flex; align-items:center; gap:.35em; color:var(--red-600); font-weight:700; }

/* ---------- Testimonials ---------- */
.testimonial-carousel{ position:relative; max-width:720px; margin:0 auto; }
.testimonial-slide{ display:none; background:var(--white); border-radius:var(--radius-lg); padding:2.2rem; box-shadow:var(--shadow-md); text-align:center; }
.testimonial-slide.active{ display:block; }
.testimonial-slide p{ font-size:1.15rem; font-style:italic; color:var(--ink-700); }
.testimonial-slide .who{ font-weight:700; color:var(--blue-800); font-style:normal; }
.carousel-dots{ display:flex; justify-content:center; gap:.5rem; margin-top:1.2rem; }
.carousel-dots button{ width:10px; height:10px; border-radius:50%; border:none; background:var(--ink-300); cursor:pointer; padding:0; }
.carousel-dots button.active{ background:var(--blue-600); }

/* ---------- Steps ---------- */
.steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:1.2rem; }
.step{ display:flex; gap:.9rem; }
@media (max-width:900px){ .steps{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:640px){ .steps{ grid-template-columns:1fr; } }

/* ---------- Importance / callout ---------- */
.callout{
  background:linear-gradient(135deg,var(--blue-50),var(--white));
  border:1px solid var(--blue-100);
  border-left:5px solid var(--blue-600);
  border-radius:var(--radius-md);
  padding:2rem;
}
.callout h3{ color:var(--blue-800); }

/* ---------- Accordion (details/summary) ---------- */
.accordion-item{ border:1px solid var(--ink-100); border-radius:var(--radius-sm); margin-bottom:.7rem; overflow:hidden; }
.accordion-item summary{ padding:1em 1.2em; font-weight:700; cursor:pointer; color:var(--blue-800); background:var(--ink-50); list-style:none; display:flex; justify-content:space-between; align-items:center; }
.accordion-item summary::-webkit-details-marker{ display:none; }
.accordion-item summary::after{ content:"+"; font-size:1.3rem; color:var(--blue-600); }
.accordion-item[open] summary::after{ content:"–"; }
.accordion-item .accordion-body{ padding:1em 1.2em; color:var(--ink-700); }

.syllabus-list li{ padding:.35em 0; border-bottom:1px dashed var(--ink-100); color:var(--ink-700); }
.syllabus-list li:last-child{ border-bottom:none; }

/* ---------- CTA band ---------- */
.cta-band{ background:linear-gradient(120deg,var(--blue-700),var(--blue-900)); color:#fff; border-radius:var(--radius-lg); padding:clamp(2rem,5vw,3.2rem); text-align:center; }
.cta-band h2{ color:#fff; }
.cta-band .btn-primary{ margin-top:.6rem; }

/* ---------- Footer ---------- */
.site-footer{ background:var(--blue-900); color:var(--blue-100); }
.footer-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:2rem; padding:3.5rem 0 2rem; }
.footer-grid h4{ color:#fff; font-size:1rem; margin-bottom:1rem; }
.footer-grid ul li{ margin-bottom:.6em; }
.footer-grid ul li a:hover{ color:#fff; }
.footer-bottom{ border-top:1px solid rgba(255,255,255,.15); padding:1.2rem 0; font-size:.85rem; display:flex; justify-content:space-between; flex-wrap:wrap; gap:.5rem; color:rgba(255,255,255,.6); }
@media (max-width:820px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-grid{ grid-template-columns:1fr; } }

/* ---------- Utilities ---------- */
.mt-0{ margin-top:0; } .mb-0{ margin-bottom:0; }
.text-muted{ color:var(--ink-500); }
.flex{ display:flex; }
.flex-center{ display:flex; align-items:center; }
.gap-sm{ gap:.6rem; } .gap-md{ gap:1rem; }
.small{ font-size:.85rem; }
.divider{ height:1px; background:var(--ink-100); margin:2.5rem 0; }
.mobile-sticky-cta{ display:none; }
@media (max-width:768px){
  .mobile-sticky-cta{
    display:flex; position:fixed; bottom:0; left:0; right:0; z-index:90;
    background:#fff; padding:.7rem 1rem calc(.7rem + env(safe-area-inset-bottom));
    box-shadow:0 -6px 20px rgba(15,23,42,.12);
  }
  body{ padding-bottom:64px; }
}

#contact-form label{ display:block; font-weight:700; margin-bottom:.4rem; color:var(--ink-900); }
#contact-form input,
#contact-form select,
#contact-form textarea{
  width:100%;
  padding:.7rem .9rem;
  border:1px solid var(--ink-300);
  border-radius:var(--radius-sm);
  font:inherit;
  color:var(--ink-900);
  background:var(--white);
}
#contact-form input:focus,
#contact-form select:focus,
#contact-form textarea:focus{
  outline:none;
  border-color:var(--blue-500);
  box-shadow:0 0 0 3px var(--blue-100);
}
#contact-form .field{ margin-bottom:1.2rem; }