/* ==========================================================================
   ReviseWithMe.ng — Design System
   Palette:  Green #0E9249 / Orange #F06627 (from brand mark)
   Type:     Fraunces (display) + Inter (body) + Space Mono (labels/stamps)
   Signature: highlighter-marker underlines + rubber-stamp badges +
              spiral-bound "flashcard" subject cards on a warm paper ground
   ========================================================================== */

:root{
  --green:        #0E9249;
  --green-dark:   #0A5C30;
  --green-ink:    #0A3A21;
  --orange:       #F06627;
  --orange-dark:  #D4501A;
  --paper:        #FBF7EF;
  --paper-alt:    #F4EFE2;
  --card:         #FFFFFF;
  --ink:          #172420;
  --ink-soft:     #56645C;
  --line:         #E3DCC8;
  --shadow:       0 12px 30px -12px rgba(10, 58, 33, 0.25);

  --font-display: "Fraunces", "Iowan Old Style", serif;
  --font-body:    "Inter", -apple-system, sans-serif;
  --font-mono:    "Space Mono", monospace;

  --radius-s: 8px;
  --radius-m: 16px;
  --radius-l: 28px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

/* subtle paper grain, evokes a revision notebook page */
body::before{
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
  background-image:
    radial-gradient(rgba(10,58,33,0.035) 1px, transparent 1px);
  background-size: 3px 3px;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
ul{ margin: 0; padding: 0; list-style: none; }
button{ font-family: inherit; }

.container{
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

section{ position: relative; z-index: 1; }

h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--green-ink);
  margin: 0 0 0.5em;
}
h1{ font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 500; }
h2{ font-size: clamp(1.9rem, 3.4vw, 2.6rem); }
h3{ font-size: 1.3rem; }
p{ margin: 0 0 1em; color: var(--ink-soft); }

.eyebrow{
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  color: var(--orange-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before{
  content: "";
  width: 18px; height: 2px;
  background: var(--orange);
  display: inline-block;
}

/* ---- Highlighter-marker signature: a hand-scribbled underline behind
   key words, like a student marking up revision notes. ---- */
.mark{
  position: relative;
  white-space: nowrap;
}
.mark::after{
  content: "";
  position: absolute;
  left: -3%; right: -3%; bottom: 0.03em;
  height: 0.38em;
  background: var(--orange);
  opacity: 0.35;
  z-index: -1;
  border-radius: 3px 8px 3px 8px / 8px 3px 8px 3px;
  transform: rotate(-0.6deg);
}
.mark.green::after{ background: var(--green); opacity: 0.28; }

/* ---- Buttons ---- */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.btn:hover{ transform: translateY(-2px); }
.btn-primary{ background: var(--orange); color: #fff; box-shadow: 0 10px 24px -8px rgba(240,102,39,0.55); }
.btn-primary:hover{ background: var(--orange-dark); }
.btn-outline{ background: transparent; border-color: var(--green); color: var(--green-dark); }
.btn-outline:hover{ background: var(--green); color: #fff; }
.btn-ghost-light{ background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.5); color: #fff; }
.btn-ghost-light:hover{ background: #fff; color: var(--green-dark); }

/* ---- Header ---- */
.site-header{
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,247,239,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner{
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
  gap: 24px;
}
.brand{ display: flex; align-items: center; gap: 10px; }
.brand img{ height: 42px; width: auto; }
.brand-word{ font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; color: var(--green-ink); }

.main-nav{ display: flex; align-items: center; gap: 4px; }
.main-nav > ul{ display: flex; align-items: center; gap: 2px; }
.main-nav a.nav-link{
  padding: 10px 16px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--green-ink);
  position: relative;
}
.main-nav a.nav-link:hover{ background: var(--paper-alt); }
.main-nav li{ position: relative; }
.main-nav li.has-sub:hover .submenu,
.main-nav li.has-sub:focus-within .submenu{ display: block; }
.submenu{
  display: none;
  position: absolute; top: 100%; left: 0;
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius-s);
  box-shadow: var(--shadow);
  min-width: 190px; padding: 8px;
  z-index: 10;
}
.submenu a{ display: block; padding: 9px 12px; border-radius: 6px; font-size: 0.88rem; font-weight: 500; color: var(--ink); }
.submenu a:hover{ background: var(--paper-alt); color: var(--green-dark); }
.header-cta{ display: flex; align-items: center; gap: 10px; }
.header-cta a.login{ font-weight: 600; font-size: 0.9rem; padding: 10px 14px; }

.nav-toggle{
  display: none;
  background: none; border: none; cursor: pointer;
  width: 42px; height: 42px; align-items: center; justify-content: center;
  border-radius: 8px;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content: ""; display: block; width: 22px; height: 2px; background: var(--green-ink);
  position: relative; transition: all 0.2s ease;
}
.nav-toggle span::before{ position: absolute; top: -7px; }
.nav-toggle span::after{ position: absolute; top: 7px; }

/* ---- Hero ---- */
.hero{
  padding: 64px 0 40px;
  overflow: hidden;
}
.hero-grid{
  display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 48px; align-items: center;
}
.hero-badge{
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--green); color: #fff;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em;
  padding: 7px 14px; border-radius: 100px; margin-bottom: 20px;
  transform: rotate(-1.2deg);
}
.hero h1{ margin-bottom: 20px; }
.hero-lede{ font-size: 1.08rem; max-width: 46ch; }
.hero-actions{ display: flex; gap: 14px; margin-top: 8px; flex-wrap: wrap; }
.hero-stats{ display: flex; gap: 28px; margin-top: 36px; }
.hero-stats .stat-num{ font-family: var(--font-display); font-size: 1.6rem; color: var(--green-dark); font-weight: 600; }
.hero-stats .stat-label{ font-size: 0.78rem; color: var(--ink-soft); }

.hero-media{ position: relative; perspective: 900px; }
.hero-media .frame{
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow);
  aspect-ratio: 4/3.2;
}
.hero-media .frame img{ width: 100%; height: 100%; object-fit: cover; }
.stamp{
  position: absolute;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  border: 2px solid currentColor;
  border-radius: 10px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.92);
  line-height: 1.3;
  text-align: center;
}
.stamp-green{ color: var(--green); }
.stamp-orange{ color: var(--orange); }
.hero-stamp-1{ top: -18px; right: 24px; transform: rotate(6deg); }
.hero-stamp-2{ bottom: -16px; left: -20px; transform: rotate(-7deg); }

/* ---- Section headers ---- */
.section-head{ max-width: 640px; margin: 0 0 44px; }
.section-head.center{ margin-left: auto; margin-right: auto; text-align: center; }
.section-top-row{
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 24px; margin-bottom: 44px;
}
.section-top-row .section-head{ margin-bottom: 0; }

/* ---- Subjects: flashcard / index-card style with spiral holes ---- */
.subjects-grid{
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
}
.subject-card{
  background: var(--card);
  border-radius: var(--radius-m);
  padding: 30px 24px 26px;
  position: relative;
  border: 1px solid var(--line);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.subject-card:hover{ transform: translateY(-6px); box-shadow: var(--shadow); }
.subject-card .holes{
  position: absolute; top: 10px; left: 0; right: 0;
  display: flex; justify-content: center; gap: 14px;
}
.subject-card .holes span{
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--paper); border: 1px solid var(--line);
}
.subject-icon{
  width: 54px; height: 54px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin: 14px 0 18px;
}
.subject-icon svg{ width: 28px; height: 28px; }
.subject-card h3{ margin-bottom: 6px; }
.subject-count{ font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft); margin-bottom: 14px; }
.subject-card .card-link{
  font-weight: 700; font-size: 0.88rem; color: var(--green-dark);
  display: inline-flex; align-items: center; gap: 6px;
}
.subject-card .card-link:hover{ color: var(--orange-dark); }

/* ---- About ---- */
.about-section{ padding: 84px 0; }
.about-grid{ display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; align-items: center; }
.about-media{ position: relative; }
.about-media .photo-main{ border-radius: var(--radius-l); overflow: hidden; box-shadow: var(--shadow); aspect-ratio: 1/1.05; }
.about-media .photo-main img{ width: 100%; height: 100%; object-fit: cover; }
.about-badge{
  position: absolute; bottom: -22px; right: -22px;
  background: var(--green-dark); color: #fff;
  border-radius: var(--radius-m);
  padding: 18px 22px;
  box-shadow: var(--shadow);
  text-align: center;
}
.about-badge .num{ font-family: var(--font-display); font-size: 2rem; font-weight: 600; }
.about-badge .lbl{ font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em; opacity: 0.85; }

.feature-list{ display: grid; gap: 20px; margin-top: 28px; }
.feature-item{ display: flex; gap: 16px; }
.feature-item .f-icon{
  flex: none; width: 40px; height: 40px; border-radius: 10px;
  background: var(--paper-alt); color: var(--green);
  display: flex; align-items: center; justify-content: center;
}
.feature-item h4{ margin-bottom: 4px; font-size: 1.02rem; }
.feature-item p{ margin: 0; font-size: 0.94rem; }

/* ---- Courses ---- */
.courses-section{ padding: 84px 0; background: var(--paper-alt); }
.courses-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.course-card{
  background: var(--card); border-radius: var(--radius-m); overflow: hidden;
  border: 1px solid var(--line);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.course-card:hover{ transform: translateY(-6px); box-shadow: var(--shadow); }
.course-thumb{ position: relative; aspect-ratio: 16/10; }
.course-thumb img{ width: 100%; height: 100%; object-fit: cover; }
.course-thumb .duration{
  position: absolute; bottom: 10px; left: 10px;
  background: rgba(23,36,32,0.85); color: #fff;
  font-family: var(--font-mono); font-size: 0.68rem;
  padding: 4px 9px; border-radius: 100px;
}
.course-body{ padding: 20px; }
.course-rating{ font-size: 0.8rem; color: var(--orange-dark); font-weight: 700; margin-bottom: 8px; }
.course-meta{ display: flex; gap: 14px; font-size: 0.78rem; color: var(--ink-soft); margin: 10px 0 14px; }
.course-footer{ display: flex; align-items: center; justify-content: space-between; border-top: 1px dashed var(--line); padding-top: 14px; }
.course-author{ display: flex; align-items: center; gap: 8px; font-size: 0.85rem; font-weight: 600; }
.avatar-badge{
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--green); color: #fff; font-family: var(--font-mono);
  display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 700;
}
.price-tag{ font-weight: 700; color: var(--green-dark); font-size: 0.85rem; }

/* ---- CTA banner (dark) ---- */
.cta-banner{
  background: var(--green-ink);
  color: #fff;
  padding: 88px 0;
  position: relative;
  overflow: hidden;
}
.cta-banner .container{ position: relative; z-index: 2; }
.cta-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.cta-banner h2{ color: #fff; }
.cta-banner p{ color: rgba(255,255,255,0.75); }
.cta-stats-strip{ display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; margin-top: 44px; padding-top: 36px; border-top: 1px solid rgba(255,255,255,0.15); }
.cta-stats-strip .num{ font-family: var(--font-display); font-size: 2.1rem; font-weight: 600; color: var(--orange); }
.cta-stats-strip .lbl{ font-size: 0.8rem; color: rgba(255,255,255,0.7); }
.cta-photo{ border-radius: var(--radius-l); overflow: hidden; aspect-ratio: 4/3.4; box-shadow: 0 20px 50px rgba(0,0,0,0.35); }
.cta-photo img{ width: 100%; height: 100%; object-fit: cover; }
.why-list{ margin: 20px 0 0; display: grid; gap: 12px; }
.why-list li{ display: flex; gap: 10px; align-items: flex-start; color: rgba(255,255,255,0.9); font-weight: 500; }
.why-list li svg{ flex: none; margin-top: 3px; color: var(--orange); }

/* ---- Testimonials ---- */
.testimonials-section{ padding: 88px 0; }
.testi-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.testi-card{
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: 26px 22px;
  position: relative;
}
.testi-quote-mark{ font-family: var(--font-display); font-size: 2.6rem; color: var(--orange); opacity: 0.35; line-height: 1; margin-bottom: 6px; }
.testi-card p{ font-size: 0.92rem; color: var(--ink); }
.testi-person{ display: flex; align-items: center; gap: 10px; margin-top: 16px; }
.testi-name{ font-weight: 700; font-size: 0.88rem; color: var(--green-ink); }
.testi-role{ font-size: 0.75rem; color: var(--ink-soft); }
.testi-rating{ font-size: 0.75rem; color: var(--orange-dark); font-weight: 700; margin-top: 2px; }

/* ---- Newsletter ---- */
.newsletter-section{ padding: 50px 0; }
.newsletter-box{
  background: var(--green); color: #fff;
  border-radius: var(--radius-l);
  padding: 40px 44px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.newsletter-box h3{ color: #fff; margin: 0; }
.newsletter-form{ display: flex; gap: 10px; flex: 1; min-width: 280px; max-width: 440px; }
.newsletter-form input{
  flex: 1; padding: 13px 18px; border-radius: 100px; border: none; font-family: inherit; font-size: 0.9rem;
}
.newsletter-form button{
  background: var(--orange); color: #fff; border: none; padding: 13px 22px; border-radius: 100px; font-weight: 700; cursor: pointer;
  white-space: nowrap;
}

/* ---- Footer ---- */
.site-footer{ background: var(--green-ink); color: rgba(255,255,255,0.8); padding: 70px 0 24px; }
.footer-grid{ display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer-brand img{ height: 40px; margin-bottom: 16px; filter: brightness(0) invert(1); }
.footer-col h4{ color: #fff; font-family: var(--font-mono); text-transform: uppercase; font-size: 0.78rem; letter-spacing: 0.08em; margin-bottom: 18px; }
.footer-col ul{ display: grid; gap: 10px; }
.footer-col a{ font-size: 0.9rem; color: rgba(255,255,255,0.72); }
.footer-col a:hover{ color: var(--orange); }
.footer-contact li{ font-size: 0.88rem; margin-bottom: 10px; color: rgba(255,255,255,0.72); }
.footer-bottom{ display: flex; justify-content: space-between; align-items: center; padding-top: 22px; font-size: 0.82rem; flex-wrap: wrap; gap: 12px; }
.social-row{ display: flex; gap: 10px; }
.social-row a{
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid rgba(255,255,255,0.25);
  display: flex; align-items: center; justify-content: center;
}
.social-row a:hover{ background: var(--orange); border-color: var(--orange); }

/* ---- Inner page header (page banner) ---- */
.page-banner{
  padding: 56px 0 40px;
  text-align: center;
}
.page-banner .eyebrow{ justify-content: center; }
.breadcrumb{ font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft); }
.breadcrumb a{ color: var(--green-dark); font-weight: 700; }

/* ---- Generic content sections used across inner pages ---- */
.content-section{ padding: 70px 0; }
.two-col{ display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.stat-band{ display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; text-align: center; }
.stat-card{ background: #fff; border: 1px solid var(--line); border-radius: var(--radius-m); padding: 26px 16px; }
.stat-card .num{ font-family: var(--font-display); font-size: 2rem; color: var(--green-dark); font-weight: 600; }
.stat-card .lbl{ font-size: 0.82rem; color: var(--ink-soft); }

/* ---- Instructors ---- */
.instructors-grid{ display: grid; grid-template-columns: repeat(4,1fr); gap: 22px; }
.instructor-card{ background: #fff; border: 1px solid var(--line); border-radius: var(--radius-m); padding: 26px 20px; text-align: center; }
.instructor-avatar{
  width: 84px; height: 84px; border-radius: 50%; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 1.5rem; font-weight: 600; color: #fff;
}
.instructor-card h3{ margin-bottom: 2px; font-size: 1.05rem; }
.instructor-role{ font-family: var(--font-mono); font-size: 0.72rem; color: var(--orange-dark); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 10px; }
.instructor-card p{ font-size: 0.88rem; }
.instructor-tags{ display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; margin-top: 12px; }
.instructor-tags span{ background: var(--paper-alt); color: var(--green-dark); font-size: 0.72rem; padding: 4px 10px; border-radius: 100px; font-weight: 600; }

/* ---- Study material ---- */
.material-tabs{ display: flex; gap: 10px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.material-tab{
  padding: 10px 20px; border-radius: 100px; border: 1px solid var(--line);
  font-weight: 600; font-size: 0.88rem; background: #fff; cursor: pointer; color: var(--ink);
}
.material-tab.active{ background: var(--green); border-color: var(--green); color: #fff; }
.material-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.material-card{
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-m); padding: 22px;
  display: flex; gap: 16px; align-items: flex-start;
}
.material-file-icon{
  flex: none; width: 46px; height: 46px; border-radius: 10px; background: var(--paper-alt); color: var(--orange-dark);
  display: flex; align-items: center; justify-content: center;
}
.material-card h4{ margin-bottom: 4px; font-size: 0.98rem; }
.material-meta{ font-size: 0.78rem; color: var(--ink-soft); }
.material-download{ margin-top: 10px; display: inline-flex; font-size: 0.82rem; font-weight: 700; color: var(--green-dark); gap: 6px; align-items: center; }

/* ---- Contact ---- */
.contact-grid{ display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 48px; }
.contact-info-card{ background: var(--green-ink); color: #fff; border-radius: var(--radius-l); padding: 40px 32px; }
.contact-info-card h3{ color: #fff; }
.contact-info-row{ display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.contact-info-row .ci-icon{ flex: none; width: 40px; height: 40px; border-radius: 10px; background: rgba(255,255,255,0.12); display: flex; align-items: center; justify-content: center; }
.contact-info-row h4{ color: #fff; font-size: 0.92rem; margin-bottom: 3px; }
.contact-info-row p{ color: rgba(255,255,255,0.7); font-size: 0.88rem; margin: 0; }
.contact-form{ background: #fff; border: 1px solid var(--line); border-radius: var(--radius-l); padding: 36px; }
.form-row{ display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group label{ display: block; font-size: 0.82rem; font-weight: 700; margin-bottom: 6px; color: var(--green-ink); }
.form-group input, .form-group select, .form-group textarea{
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line);
  font-family: inherit; font-size: 0.92rem; background: var(--paper);
}
.form-group textarea{ resize: vertical; min-height: 120px; }
.map-frame{ border-radius: var(--radius-m); overflow: hidden; margin-top: 24px; border: 1px solid var(--line); }

/* ---- Quiz / subject-detail extras ---- */
.topic-list{ display: grid; gap: 14px; }
.topic-row{
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-s);
  padding: 16px 20px;
}
.topic-row .t-num{ font-family: var(--font-mono); color: var(--orange-dark); font-weight: 700; margin-right: 12px; }
.topic-row h4{ margin: 0; font-size: 0.96rem; display: inline; }
.topic-badge{ font-size: 0.72rem; font-weight: 700; padding: 4px 10px; border-radius: 100px; background: var(--paper-alt); color: var(--green-dark); }

/* ---- Responsive ---- */
@media (max-width: 980px){
  .hero-grid, .about-grid, .cta-grid, .two-col, .contact-grid{ grid-template-columns: 1fr; }
  .subjects-grid, .courses-grid, .testi-grid, .instructors-grid{ grid-template-columns: repeat(2, 1fr); }
  .stat-band, .cta-stats-strip{ grid-template-columns: repeat(2, 1fr); }
  .footer-grid{ grid-template-columns: repeat(2, 1fr); }
  .material-grid{ grid-template-columns: 1fr 1fr; }
  .about-badge{ right: 16px; }
}

@media (max-width: 720px){
  .main-nav{ display: none; }
  .nav-toggle{ display: flex; }
  .header-cta .login{ display: none; }
  .subjects-grid, .courses-grid, .testi-grid, .instructors-grid, .stat-band, .cta-stats-strip, .form-row, .material-grid{ grid-template-columns: 1fr; }
  .hero{ padding-top: 32px; }
  .section-top-row{ flex-direction: column; align-items: flex-start; gap: 16px; }
  .newsletter-box{ flex-direction: column; text-align: center; }
  .footer-bottom{ flex-direction: column; text-align: center; }

  .main-nav.open{
    display: block;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: 10px 24px 20px;
  }
  .main-nav.open > ul{ flex-direction: column; align-items: stretch; gap: 2px; }
  .main-nav.open .submenu{ position: static; box-shadow: none; display: block; margin-top: 4px; }
}

/* ==========================================================================
   Motion layer — scroll reveal, hover pop/bounce, ripple, page transitions
   ========================================================================== */

body{ animation: pageFadeIn 0.5s ease both; }
@keyframes pageFadeIn{ from{ opacity: 0; transform: translateY(8px); } to{ opacity: 1; transform: translateY(0); } }

.reveal{
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(.22,1,.36,1), transform 0.7s cubic-bezier(.22,1,.36,1);
}
.reveal.in-view{ opacity: 1; transform: translateY(0); }
.reveal-stagger.in-view .reveal-child{ animation: staggerUp 0.6s cubic-bezier(.22,1,.36,1) both; }
@keyframes staggerUp{ from{ opacity: 0; transform: translateY(18px); } to{ opacity: 1; transform: translateY(0); } }

@keyframes popIn{
  0%{ transform: scale(0.92); opacity: 0; }
  60%{ transform: scale(1.03); opacity: 1; }
  100%{ transform: scale(1); }
}
@keyframes bounceSm{
  0%,100%{ transform: translateY(0); }
  30%{ transform: translateY(-6px); }
  55%{ transform: translateY(0); }
  75%{ transform: translateY(-2px); }
}
@keyframes wiggle{
  0%,100%{ transform: rotate(0deg); }
  25%{ transform: rotate(-4deg); }
  75%{ transform: rotate(4deg); }
}
@keyframes pulseGlow{
  0%,100%{ box-shadow: 0 0 0 0 rgba(240,102,39,0.4); }
  50%{ box-shadow: 0 0 0 10px rgba(240,102,39,0); }
}

/* Buttons: pop + ripple */
.btn{ position: relative; overflow: hidden; transition: transform 0.18s cubic-bezier(.34,1.56,.64,1), box-shadow 0.18s ease, background 0.18s ease, color 0.18s ease; }
.btn:hover{ transform: translateY(-2px) scale(1.035); }
.btn:active{ transform: translateY(0) scale(0.97); }
.btn-primary{ animation: pulseGlow 3.5s ease-in-out infinite; }
.btn-primary:hover{ animation: none; }
.ripple{
  position: absolute; border-radius: 50%; pointer-events: none;
  background: rgba(255,255,255,0.55); transform: scale(0); opacity: 0.9;
  animation: rippleAnim 0.6s ease-out forwards;
}
@keyframes rippleAnim{ to{ transform: scale(2.6); opacity: 0; } }

/* Cards: lift + icon bounce on hover */
.subject-card, .course-card, .testi-card, .instructor-card, .material-card, .stat-card{
  transition: transform 0.35s cubic-bezier(.22,1,.36,1), box-shadow 0.35s ease, border-color 0.35s ease;
}
.subject-card:hover, .course-card:hover, .testi-card:hover, .instructor-card:hover, .material-card:hover{
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.subject-card:hover .subject-icon{ animation: bounceSm 0.6s ease; }
.subject-card:hover .card-link{ letter-spacing: 0.01em; }
.subject-card .card-link svg, .subject-card .card-link{ transition: transform 0.25s ease, color 0.25s ease; }
.subject-card:hover .card-link{ transform: translateX(3px); }

.instructor-card:hover .instructor-avatar{ animation: wiggle 0.5s ease; }
.material-card:hover .material-file-icon{ animation: bounceSm 0.55s ease; background: var(--orange); color: #fff; }
.topic-row{ transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease; }
.topic-row:hover{ transform: translateX(6px); box-shadow: var(--shadow); border-color: transparent; }

/* Nav link underline sweep */
.main-nav a.nav-link{ transition: background 0.25s ease, color 0.25s ease; }
.brand img{ transition: transform 0.4s ease; }
.brand:hover img{ transform: rotate(-8deg) scale(1.06); }

/* Hero media: subtle mouse-tilt parallax + floating stamps */
.hero-media .frame{ transition: transform 0.25s ease; will-change: transform; }
.stamp{ animation: floatStamp 4.5s ease-in-out infinite; }
.hero-stamp-2{ animation-delay: 0.6s; }
@keyframes floatStamp{
  0%,100%{ transform: translateY(0) rotate(var(--r, 0deg)); }
  50%{ transform: translateY(-7px) rotate(var(--r, 0deg)); }
}
.hero-stamp-1{ --r: 6deg; }
.hero-stamp-2{ --r: -7deg; }

/* Counters: gentle scale pop as they land */
[data-count]{ display: inline-block; }

/* Form field focus glow */
.form-group input:focus, .form-group select:focus, .form-group textarea:focus,
.newsletter-form input:focus{
  outline: none; border-color: var(--green); box-shadow: 0 0 0 4px rgba(14,146,73,0.14);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

/* Mobile menu open animation */
.main-nav.open{ animation: popIn 0.25s ease both; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ transition: none !important; animation: none !important; }
}