/* =========================================================
   Mother Board Education — style.css
   Design system per Website Design Documentation v4, Section 3.
   ========================================================= */

/* ---- 1. Design tokens ---- */
:root {
  --color-primary: #2A1B3D;       /* aubergine */
  --color-primary-dark: #1C1129;  /* footer accents, hover states */
  --color-accent: #7C4DFF;        /* violet — CTAs, highlights */
  --color-accent-dark: #6435FF;
  --color-bg: #F7F6FA;            /* cool neutral page background */
  --color-surface: #FFFFFF;       /* cards */
  --color-border: #E6E3EF;        /* card/section borders */
  --color-text: #221733;
  --color-text-muted: #6B6B6B;

  --font-heading: "Sora", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --radius-card: 12px;
  --radius-pill: 20px;

  --container-width: 1180px;
  --shadow-card: 0 4px 16px rgba(42, 27, 61, 0.08);
  --shadow-card-hover: 0 10px 28px rgba(42, 27, 61, 0.14);
}

/* ---- 2. Reset & base ---- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.25;
  margin: 0 0 .6em;
}
h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.text-muted { color: var(--color-text-muted); }

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--color-accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  z-index: 1000;
}
.skip-link:focus { left: 12px; top: 12px; }

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

section { padding: 64px 0; }
.section--tight { padding: 40px 0; }
.section--alt { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }

.section-head { max-width: 640px; margin: 0 0 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: .5em;
}

/* ---- 3. Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .95rem;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { background: var(--color-accent-dark); box-shadow: 0 8px 20px rgba(124,77,255,.35); }
.btn--dark { background: var(--color-primary); color: #fff; }
.btn--dark:hover { background: var(--color-primary-dark); }
.btn--ghost { background: transparent; border-color: var(--color-primary); color: var(--color-primary); }
.btn--ghost:hover { background: var(--color-primary); color: #fff; }
.btn--ghost-light { background: transparent; border-color: rgba(255,255,255,.6); color: #fff; }
.btn--ghost-light:hover { background: #fff; color: var(--color-primary); }
.btn--small { padding: 9px 18px; font-size: .85rem; }
.btn--block { width: 100%; }

/* ---- 4. Header / nav ---- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 500;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  padding-bottom: 12px;
}
.brand img { height: 48px; width: auto; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin: 0 auto;
  transition: transform .2s ease, opacity .2s ease;
}

.primary-nav { display: flex; align-items: center; gap: 28px; }
.primary-nav ul { display: flex; gap: 24px; }
.primary-nav a {
  font-weight: 600;
  font-size: .95rem;
  color: var(--color-text);
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
}
.primary-nav a:hover,
.primary-nav a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.nav-portal { flex-shrink: 0; }

/* ---- 5. Hero ---- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 48px;
  padding: 72px 0;
}
.hero h1 { color: #fff; }
.hero p.lead { font-size: 1.1rem; color: rgba(255,255,255,.85); max-width: 46ch; }
.hero__actions { display: flex; gap: 16px; margin-top: 28px; flex-wrap: wrap; }
.hero__media img {
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card-hover);
}

.page-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 56px 0;
  text-align: center;
}
.page-hero h1 { color: #fff; margin-bottom: .3em; }
.page-hero p { color: rgba(255,255,255,.82); max-width: 60ch; margin: 0 auto; }

/* ---- 6. Cards ---- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-3px); }

.grid { display: grid; gap: 28px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--6 { grid-template-columns: repeat(6, 1fr); }

/* Why choose us */
.feature-card { text-align: left; }
.feature-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124,77,255,.1);
  border-radius: 12px;
  margin-bottom: 16px;
}
.feature-card__icon img { width: 28px; height: 28px; }

/* Service cards */
.service-card { display: flex; flex-direction: column; height: 100%; }
.service-card__icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(124,77,255,.1);
  border-radius: 12px;
  margin-bottom: 16px;
}
.service-card__icon img { width: 28px; height: 28px; }
.service-card p { flex-grow: 1; }
.service-card .btn { align-self: flex-start; margin-top: 12px; }

/* About teaser / consolidated blocks */
.about-teaser { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.value-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 24px; }
.value-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 22px;
}
.value-block h3 { margin-bottom: .3em; }

/* Testimonials */
.testimonial-card { text-align: left; }
.testimonial-card__quote { font-style: italic; color: var(--color-text); margin-bottom: 16px; }
.testimonial-card__meta { display: flex; align-items: center; gap: 12px; }
.testimonial-card__avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading); font-weight: 700;
  flex-shrink: 0;
}
.testimonial-card__name { font-weight: 700; color: var(--color-primary); }
.testimonial-card__role { font-size: .85rem; color: var(--color-text-muted); }
.placeholder-badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(124,77,255,.12);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
}

/* Logo strip */
.logo-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: center;
  justify-content: center;
  padding: 24px 0;
}
.logo-strip__placeholder {
  width: 130px; height: 56px;
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  font-size: .75rem;
  text-align: center;
}

/* Email signup */
.signup-band {
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-card);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.signup-band h2 { color: #fff; margin-bottom: .2em; }
.signup-form { display: flex; gap: 10px; flex-wrap: wrap; }
.signup-form input[type="email"] {
  padding: 13px 18px;
  border-radius: var(--radius-pill);
  border: none;
  min-width: 260px;
  font-family: var(--font-body);
}

/* ---- 7. Courses catalog ---- */
.course-toolbar {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 16px;
}
.course-toolbar input[type="search"],
.course-toolbar select {
  padding: 11px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  font-family: var(--font-body);
  background: var(--color-bg);
}
.course-toolbar input[type="search"] { flex: 1; min-width: 220px; }
.course-count { font-size: .9rem; color: var(--color-text-muted); margin-left: auto; }

.course-category { margin-bottom: 44px; }
.course-category__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 10px;
  margin-bottom: 20px;
}
.course-category__title span { font-size: .85rem; color: var(--color-text-muted); font-weight: 500; }

.course-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
}
.course-card h4 { font-family: var(--font-heading); color: var(--color-primary); margin: 0 0 10px; font-size: 1.02rem; }
.course-card__meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.tag {
  font-size: .72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(124,77,255,.1);
  color: var(--color-accent-dark);
}
.no-results { display: none; text-align: center; padding: 40px; color: var(--color-text-muted); }

/* ---- 8. Blog ---- */
.blog-filter { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
.blog-filter button {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .85rem;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}
.blog-filter button.active,
.blog-filter button:hover { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }

.blog-card { overflow: hidden; padding: 0; display: flex; flex-direction: column; }
.blog-card img { border-radius: var(--radius-card) var(--radius-card) 0 0; aspect-ratio: 16/10; object-fit: cover; }
.blog-card__body { padding: 22px; }
.blog-card__date { font-size: .8rem; color: var(--color-text-muted); }

.post-hero img { border-radius: var(--radius-card); margin-bottom: 24px; }
.post-body h2 { margin-top: 1.4em; }
.post-body ul { list-style: disc; padding-left: 1.4em; margin-bottom: 1em; }
.post-body ul li { margin-bottom: .4em; }

/* ---- 9. Contact ---- */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .9rem; }
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-body);
  font-size: 1rem;
}
.form-field textarea { resize: vertical; min-height: 130px; }
.form-field .error {
  display: none;
  color: #B3261E;
  font-size: .82rem;
  margin-top: 6px;
}
.form-field.has-error input,
.form-field.has-error select,
.form-field.has-error textarea { border-color: #B3261E; }
.form-field.has-error .error { display: block; }
.form-status {
  display: none;
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: 10px;
  background: rgba(124,77,255,.1);
  color: var(--color-primary);
  font-weight: 600;
}
.contact-info-card { padding: 0; overflow: hidden; }
.contact-info-card__map { width: 100%; height: 260px; border: 0; display: block; }
.contact-info-card__body { padding: 24px; }
.contact-info-row { display: flex; gap: 12px; margin-bottom: 14px; align-items: flex-start; }
.contact-info-row svg { flex-shrink: 0; color: var(--color-accent); margin-top: 3px; }

/* ---- 10. Service detail ---- */
.service-detail-hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.steps { counter-reset: step; display: grid; gap: 20px; }
.step { display: flex; gap: 18px; align-items: flex-start; }
.step::before {
  counter-increment: step;
  content: counter(step);
  flex-shrink: 0;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.included-list { display: grid; gap: 12px; }
.included-list li { display: flex; gap: 10px; align-items: flex-start; }
.included-list svg { flex-shrink: 0; color: var(--color-accent); margin-top: 3px; }
.service-switch { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 8px; }
.service-switch a {
  font-size: .82rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}
.service-switch a.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ---- 11. Success stories ---- */
.case-study { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; margin-top: 20px; }
.case-study .card h4 { color: var(--color-accent-dark); font-family: var(--font-heading); font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; }

/* ---- 12. 404 ---- */
.error-page { text-align: center; padding: 100px 0; }
.error-page__code {
  font-family: var(--font-heading);
  font-size: clamp(4rem, 12vw, 8rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
}
.error-page__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }

/* ---- 13. Chat widget ---- */
.chat-widget { position: fixed; bottom: 24px; right: 24px; z-index: 900; }
.chat-widget__toggle {
  width: 58px; height: 58px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  border: none;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(124,77,255,.4);
  cursor: pointer;
}
.chat-widget__panel {
  position: absolute;
  bottom: 72px;
  right: 0;
  width: 280px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card-hover);
  overflow: hidden;
}
.chat-widget__header {
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  padding: 14px 18px;
}
.chat-widget__body { padding: 18px; font-size: .9rem; }
.chat-widget__body a { color: var(--color-accent-dark); font-weight: 700; }

/* ---- 14. Legal / simple pages ---- */
.prose { max-width: 760px; }
.prose h2 { margin-top: 1.2em; }

/* ---- 15. Footer ---- */
.site-footer { background: var(--color-primary); color: rgba(255,255,255,.82); padding-top: 56px; }
.site-footer h3 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.site-footer__logo { filter: brightness(0) invert(1); margin-bottom: 16px; }
.site-footer a:hover { color: #fff; }
.footer-links li { margin-bottom: 10px; }
.footer-tagline { margin-top: 12px; }
.socials { display: flex; gap: 12px; }
.social-icon {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.1);
  display: flex; align-items: center; justify-content: center;
}
.social-icon:hover { background: var(--color-accent); }
.site-footer__bottom { padding: 22px 0; font-size: .85rem; text-align: center; }

/* =========================================================
   Responsive — breakpoints per NFR: 576 / 768 / 992 / 1200
   ========================================================= */
@media (max-width: 1200px) {
  .grid--4 { grid-template-columns: repeat(3, 1fr); }
  .grid--6 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
  .hero__inner { grid-template-columns: 1fr; text-align: center; padding: 48px 0; }
  .hero__media { order: -1; }
  .hero__actions { justify-content: center; }
  .about-teaser { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .service-detail-hero { grid-template-columns: 1fr; }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--6 { grid-template-columns: repeat(2, 1fr); }
  .case-study { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 24px;
    gap: 16px;
    display: none;
  }
  .primary-nav.is-open { display: flex; }
  .primary-nav ul { flex-direction: column; gap: 4px; }
  .primary-nav a { display: block; padding: 10px 0; }
  .value-grid { grid-template-columns: 1fr; }
  .signup-band { flex-direction: column; align-items: stretch; text-align: center; }
  .signup-form { justify-content: center; }
}

@media (max-width: 576px) {
  section { padding: 44px 0; }
  .grid--2, .grid--3, .grid--4, .grid--6 { grid-template-columns: 1fr; }
  .course-toolbar { flex-direction: column; align-items: stretch; }
  .course-count { margin-left: 0; }
  .chat-widget__panel { width: calc(100vw - 48px); }
}