/* ============================================================
   TeacherHelp — Design System
   Palette: white / navy #1F3864 / mid blue #2E5C99 / pale blue
   #EEF3FA & #DCE6F1 / gray #595959. No purple, cream, red, orange.
   ============================================================ */

:root {
  --white: #ffffff;
  --navy: #1f3864;
  --navy-dark: #16294a;
  --blue: #2e5c99;
  --blue-light: #4472b0;
  --pale-blue: #eef3fa;
  --pale-blue-strong: #dce6f1;
  --gray: #595959;
  --gray-light: #8b8b8b;
  --gray-border: #d7dbe0;
  --gray-bg: #f6f7f9;
  --text: #000000;

  --font-heading: "Lexend", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", Arial, sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(31, 56, 100, 0.06), 0 1px 1px rgba(31, 56, 100, 0.04);
  --shadow-md: 0 6px 20px rgba(31, 56, 100, 0.08);
  --shadow-lg: 0 16px 40px rgba(31, 56, 100, 0.12);

  --container: 1180px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--text); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--blue); }
ul, ol { margin: 0; padding: 0; }
button { font-family: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text);
  line-height: 1.2;
  margin: 0 0 0.6em;
  font-weight: 600;
}
h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow { max-width: 820px; }

section { padding: 72px 0; }
@media (max-width: 720px) {
  section { padding: 48px 0; }
}

.section-alt { background: var(--pale-blue); }
.section-navy { background: var(--navy); color: #cfe0f5; }
.section-navy h2, .section-navy h3 { color: var(--white); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 0.9em;
}

.section-head {
  max-width: 720px;
  margin: 0 0 2.4em;
}
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.lede {
  font-size: 1.1rem;
  color: var(--text);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--navy); color: var(--white); }
.btn--primary:hover { background: var(--navy-dark); }

.btn--secondary { background: var(--white); color: var(--text); border-color: var(--navy); }
.btn--secondary:hover { background: var(--pale-blue); }

.btn--ghost { background: transparent; color: var(--text); border-color: var(--blue); }
.btn--ghost:hover { background: var(--pale-blue); }

.btn--on-navy { background: var(--white); color: var(--text); }
.btn--on-navy:hover { background: var(--pale-blue-strong); }

.btn--block { width: 100%; }
.btn--sm { padding: 9px 18px; font-size: 0.85rem; }

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-border);
}
.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}
.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
}
.logo:hover { text-decoration: none; }
.logo__mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--navy);
  color: var(--white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
}
.logo__mark span { color: var(--pale-blue); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.main-nav__links {
  display: flex;
  gap: 30px;
  list-style: none;
}
.main-nav__links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}
.main-nav__links a:hover { color: var(--text); text-decoration: none; }
.main-nav__actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed;
    inset: 74px 0 0 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 28px 24px;
    gap: 24px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    overflow-y: auto;
  }
  .main-nav.is-open { opacity: 1; transform: translateY(0); visibility: visible; }
  .main-nav__links { flex-direction: column; gap: 20px; width: 100%; }
  .main-nav__actions { flex-direction: column; width: 100%; align-items: stretch; }
  .main-nav__actions .btn { width: 100%; }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy);
  color: #b7c9e2;
  padding: 64px 0 28px;
}
.site-footer a { color: #d8e4f4; text-decoration: none; }
.site-footer a:hover { color: var(--white); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-grid h4 {
  color: var(--white);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1.1em;
}
.footer-grid ul { list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 0.92rem; }
.footer-brand p { color: #a9bcd8; font-size: 0.92rem; max-width: 300px; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-size: 0.82rem;
  color: #8fa5c6;
  flex-wrap: wrap;
  gap: 12px;
}
@media (max-width: 780px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-md);
  padding: 28px;
}
.card--pale { background: var(--pale-blue); border-color: var(--pale-blue-strong); }

.grid {
  display: grid;
  gap: 24px;
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 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: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

.icon-badge {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--pale-blue-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  margin-bottom: 16px;
}
.icon-badge svg { width: 22px; height: 22px; }

/* ---------- Pills / badges ---------- */
.pill {
  display: inline-block;
  background: var(--pale-blue-strong);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
}
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- Hero ---------- */
.hero {
  padding: 84px 0 56px;
  background: linear-gradient(180deg, var(--pale-blue) 0%, var(--white) 100%);
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { margin-bottom: 0.5em; }
.hero .lede { margin-bottom: 1.8em; max-width: 520px; }
.hero__art { width: 100%; max-width: 480px; margin: 0 auto; }

.slide {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  aspect-ratio: 900 / 631;
}
.slide__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  position: absolute;
  inset: 0;
  transition: opacity 0.6s ease;
}
.slide__img.is-active { opacity: 1; }
.slide__dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}
.slide__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  padding: 0;
}
.slide__dot.is-active { background: var(--white); }

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
}

/* ---------- Banner ---------- */
.banner-section { padding: 0 0 72px; }
.banner-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: block;
}
@media (max-width: 720px) {
  .banner-section { padding: 0 0 48px; }
}

/* ---------- Path / flow diagram ---------- */
.flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  justify-content: center;
}
.flow__step {
  background: var(--white);
  border: 1.5px solid var(--pale-blue-strong);
  color: var(--text);
  font-weight: 600;
  font-size: 0.88rem;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.flow__arrow {
  color: var(--text);
  padding: 0 10px;
  font-size: 1.1rem;
}
@media (max-width: 720px) {
  .flow { flex-direction: column; }
  .flow__arrow { transform: rotate(90deg); padding: 4px 0; }
}

.search-example {
  margin: 32px auto 0;
  max-width: 720px;
  background: var(--white);
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 22px 26px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.search-example__label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text);
  width: 100%;
}
.search-example__path {
  font-family: var(--font-heading);
  color: var(--text);
  font-weight: 600;
  font-size: 1.02rem;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.search-example__path span.sep { color: var(--blue-light); font-weight: 400; }

/* ---------- Trust bar ---------- */
.trust-bar {
  padding: 40px 0;
  border-top: 1px solid var(--gray-border);
  border-bottom: 1px solid var(--gray-border);
}
.trust-bar__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.trust-bar__stat {
  font-family: var(--font-heading);
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.5;
}
.trust-bar__caption {
  margin-top: 24px;
  font-size: 0.82rem;
  color: var(--text);
  max-width: 780px;
}
@media (max-width: 900px) {
  .trust-bar__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .trust-bar__grid { grid-template-columns: 1fr; }
}

/* ---------- Tracker visual ---------- */
.tracker {
  background: var(--white);
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px;
}
.tracker__title {
  font-family: var(--font-heading);
  color: var(--text);
  font-weight: 600;
  margin-bottom: 18px;
  font-size: 1rem;
}
.tracker__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-top: 1px solid var(--gray-border);
  font-size: 0.92rem;
}
.tracker__row:first-of-type { border-top: none; }
.tracker__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
}
.tracker__status--complete { background: var(--navy); color: var(--white); }
.tracker__status--progress { background: var(--pale-blue-strong); color: var(--text); }
.tracker__status--pending { background: var(--white); color: var(--text); border: 1px solid var(--gray-border); }
.tracker__dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* ---------- Testimonial placeholder ---------- */
.notice {
  background: var(--pale-blue);
  border: 1px dashed var(--blue-light);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  color: var(--text);
  text-align: center;
  font-size: 1rem;
}

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--navy);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 56px;
  text-align: center;
}
.cta-band h2 { color: var(--white); }
.cta-band p { color: #cfe0f5; font-size: 1.05rem; margin-bottom: 1.6em; }
.cta-band .btn-row { justify-content: center; }
@media (max-width: 620px) {
  .cta-band { padding: 40px 24px; }
}

/* ---------- Pricing ---------- */
.pricing-card {
  background: var(--white);
  border: 1.5px solid var(--gray-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
}
.pricing-card--featured {
  border-color: var(--navy);
  box-shadow: var(--shadow-lg);
  position: relative;
}
.pricing-card__tag {
  position: absolute;
  top: -14px;
  left: 36px;
  background: var(--navy);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
}
.pricing-card__price {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: var(--text);
  font-weight: 700;
  margin: 10px 0 20px;
}
.pricing-card__price small { font-size: 0.85rem; font-weight: 500; color: var(--text); }
.pricing-card ul { list-style: none; display: flex; flex-direction: column; gap: 12px; margin: 24px 0 28px; flex-grow: 1; }
.pricing-card li { display: flex; gap: 10px; align-items: flex-start; font-size: 0.94rem; }
.pricing-card li svg { flex-shrink: 0; margin-top: 3px; color: var(--text); width: 16px; height: 16px; }

/* ---------- FAQ accordion ---------- */
.accordion { display: flex; flex-direction: column; gap: 12px; }
.accordion-item {
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-md);
  background: var(--white);
  overflow: hidden;
}
.accordion-item__trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--text);
  font-size: 1rem;
}
.accordion-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
}
.accordion-item__icon::before, .accordion-item__icon::after {
  content: "";
  position: absolute;
  background: var(--blue);
  border-radius: 2px;
  transition: transform 0.2s ease;
}
.accordion-item__icon::before { width: 14px; height: 2px; top: 9px; left: 3px; }
.accordion-item__icon::after { width: 2px; height: 14px; top: 3px; left: 9px; }
.accordion-item.is-open .accordion-item__icon::after { transform: rotate(90deg); }
.accordion-item__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.accordion-item__panel-inner { padding: 0 24px 22px; color: var(--text); font-size: 0.96rem; }

/* ---------- Forms ---------- */
.form-field { margin-bottom: 20px; }
.form-field label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.88rem;
  color: var(--text);
  margin-bottom: 7px;
}
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--gray-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--white);
  transition: border-color 0.15s ease;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--blue);
}
.form-field textarea { resize: vertical; min-height: 130px; }
.form-note { font-size: 0.82rem; color: var(--text); margin-top: 8px; }
.form-success {
  display: none;
  background: var(--pale-blue);
  border: 1px solid var(--pale-blue-strong);
  color: var(--text);
  padding: 18px 20px;
  border-radius: var(--radius-md);
  margin-top: 18px;
}
.form-success.is-visible { display: block; }
.form-error {
  display: none;
  background: var(--white);
  border: 1.5px solid var(--navy);
  color: var(--text);
  padding: 18px 20px;
  border-radius: var(--radius-md);
  margin-top: 18px;
  font-weight: 500;
}
.form-error.is-visible { display: block; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--text); text-decoration: none; }
.breadcrumb a:hover { color: var(--text); text-decoration: underline; }

/* ---------- Page hero (simple) ---------- */
.page-hero {
  padding: 64px 0 48px;
  background: var(--pale-blue);
  text-align: center;
}
.page-hero .eyebrow { display: block; }
.page-hero h1 { margin-bottom: 0.4em; }
.page-hero .lede { max-width: 640px; margin: 0 auto; }

/* ---------- Resource intro card ---------- */
.resource-intro-card {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
  align-items: center;
  background: var(--pale-blue);
  border: 1px solid var(--pale-blue-strong);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.resource-intro-card__art img {
  width: 100%;
  max-height: 480px;
  height: auto;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: block;
  margin: 0 auto;
}
.resource-intro-card__body .btn { margin-top: 8px; }
@media (max-width: 900px) {
  .resource-intro-card { grid-template-columns: 1fr; padding: 28px; }
  .resource-intro-card__art { order: -1; }
}

/* ---------- Article / blog ---------- */
.article-card {
  background: var(--white);
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.article-card__meta {
  font-size: 0.78rem;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: 10px;
}
.article-card h3 { margin-bottom: 10px; }
.article-card h3 a { color: var(--text); text-decoration: none; }
.article-card h3 a:hover { color: var(--text); text-decoration: underline; }
.article-card p { color: var(--text); font-size: 0.94rem; flex-grow: 1; }
.article-card .read-more { margin-top: 14px; font-weight: 600; font-size: 0.9rem; }

.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { margin-top: 1.6em; }
.prose h3 { margin-top: 1.4em; }
.prose p, .prose ul, .prose ol { color: var(--text); font-size: 1.02rem; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.3em; }
.prose li { margin-bottom: 0.5em; }
.prose blockquote {
  margin: 1.6em 0;
  padding: 18px 24px;
  background: var(--pale-blue);
  border-left: 4px solid var(--navy);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  font-style: normal;
}
.prose blockquote p { margin: 0; }
.article-header { text-align: center; padding: 56px 0 40px; background: var(--pale-blue); }
.article-header .eyebrow { display: block; }
.article-header h1 { max-width: 780px; margin: 0 auto 0.5em; }
.article-meta-row {
  display: flex;
  gap: 18px;
  justify-content: center;
  color: var(--text);
  font-size: 0.88rem;
  flex-wrap: wrap;
}

/* ---------- Utility ---------- */
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.muted { color: var(--text); }
.divider { height: 1px; background: var(--gray-border); border: none; margin: 48px 0; }
.stack { display: flex; flex-direction: column; gap: 16px; }
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; gap: 32px; }
}
.check-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; }
.check-list svg { flex-shrink: 0; margin-top: 3px; color: var(--text); width: 18px; height: 18px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--navy);
  color: var(--white);
  padding: 10px 16px;
  z-index: 200;
}
.skip-link:focus { left: 16px; top: 16px; }