:root {
  --paper: #F6F3EC;
  --paper-line: #E2DDD0;
  --ink: #20283D;
  --ink-soft: #5B6378;
  --red: #C84B31;
  --red-dark: #A23B25;
  --green: #3F7D58;
  --green-bg: #E9F1EB;
  --yellow: #C9A227;
  --card: #FFFFFF;
  --radius: 14px;
  --font: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.6;
}

body[data-page="home"],
body[data-page="finalGrade"],
body[data-page="weightedGrade"],
body[data-page="blog"] {
  line-height: 1.5;
}
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 24px 0;
}

.logo {
  font-family: var(--font);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.25;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
  white-space: nowrap;
}

.logo span {
  color: var(--red);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--ink);
}

.nav-toggle svg {
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links > a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

.nav-links > a:hover {
  color: var(--ink);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  background: none;
  border: none;
  color: var(--ink-soft);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0;
}

.nav-dropdown-toggle:hover,
.nav-dropdown.open .nav-dropdown-toggle {
  color: var(--ink);
}

.nav-dropdown-toggle svg {
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.nav-dropdown.open .nav-dropdown-toggle svg {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: var(--card);
  border: 1px solid var(--paper-line);
  border-radius: 10px;
  box-shadow: 0 6px 20px rgba(32, 40, 61, 0.1);
  min-width: 270px;
  padding: 6px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s ease;
  z-index: 100;
}

.nav-dropdown-menu a {
  display: block;
  padding: 10px 18px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  background: var(--paper);
  color: var(--ink);
}

@media (min-width: 561px) {
  .nav-dropdown:hover .nav-dropdown-menu,
  .nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }
}

/* footer */
footer {
  border-top: 1px solid var(--paper-line);
  background: #fff;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px;
  display: grid;
  grid-template-columns: 1.1fr 1.9fr;
  gap: 28px;
}

.footer-brand-name {
  font-weight: 700;
  margin: 0 0 8px;
}

.footer-brand-name span {
  color: var(--red);
}

.footer-desc {
  margin: 0;
  color: var(--ink-soft);
}

.footer-sitemap {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 40px;
  justify-content: start;
}

.footer-col h4 {
  margin: 0 0 8px;
  font-size: 15px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin: 7px 0;
}

.footer-col a {
  text-decoration: none;
  color: var(--ink-soft);
  white-space: nowrap;
}

.footer-bottom {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--paper-line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.copy {
  margin: 0;
  color: var(--ink-soft);
}

.footer-bottom-links {
  display: flex;
  gap: 14px;
}

.footer-bottom-links a {
  text-decoration: none;
  color: var(--ink-soft);
}

/* tool pages */
.wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.hero {
  text-align: center;
  margin: 48px 0 40px;
}

.hero h1.eyebrow {
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--red);
  margin: 0 0 14px;
  line-height: 1.5;
}

.hero-lead {
  font-family: var(--font);
  font-weight: 700;
  font-size: 42px;
  line-height: 1.15;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}

.hero-desc {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 620px;
  margin: 0 auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 30px;
}

.info {
  margin-top: 64px;
}

.info h2 {
  font-family: var(--font);
  font-weight: 600;
  font-size: 24px;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.info p {
  color: var(--ink-soft);
  font-size: 15px;
  margin: 0 0 16px;
}

.info strong {
  color: var(--ink);
  font-weight: 600;
}

.how-img {
  margin: 18px 0 24px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--paper-line);
}

.how-img svg {
  display: block;
  width: 100%;
  height: auto;
}

.faq {
  margin: 18px 0 32px;
}

.faq details {
  border-bottom: 1px solid var(--paper-line);
  padding: 14px 0;
}

.faq summary {
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  font-family: var(--font);
  font-size: 20px;
  color: var(--red);
  flex-shrink: 0;
}

.faq details[open] summary::after {
  content: '–';
}

.faq p {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.cross-links {
  margin: 24px 0 20px;
  padding: 0;
  list-style: none;
}

.cross-links li {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: 15px;
}

.cross-links a {
  color: var(--red);
  font-weight: 600;
  text-decoration: none;
}

.cross-links a:hover {
  text-decoration: underline;
}

/* content pages */
.page-wrap {
  max-width: 840px;
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.page-card {
  background: var(--card);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 32px;
}

.page-card h1 {
  margin: 0 0 14px;
  font-size: 40px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-card h2 {
  margin: 28px 0 10px;
  font-size: 24px;
}

.page-card h3 {
  margin: 20px 0 8px;
  font-size: 18px;
}

.page-card p {
  margin: 0 0 14px;
  color: var(--ink-soft);
}

.page-card ul {
  margin: 0 0 14px;
  padding-left: 20px;
  color: var(--ink-soft);
}

body[data-page="contact"] .page-wrap {
  max-width: 860px;
}

body[data-page="contact"] .page-card h2 {
  margin: 24px 0 10px;
  font-size: 22px;
}

body[data-page="privacy"] .page-wrap,
body[data-page="cookie"] .page-wrap {
  max-width: 900px;
}

body[data-page="privacy"],
body[data-page="cookie"] {
  line-height: 1.65;
}

body[data-page="privacy"] .page-card h1,
body[data-page="cookie"] .page-card h1 {
  margin: 0 0 12px;
  font-size: 38px;
}

body[data-page="privacy"] .page-card h2,
body[data-page="cookie"] .page-card h2 {
  margin: 22px 0 8px;
  font-size: 22px;
}

body[data-page="privacy"] .page-card p,
body[data-page="cookie"] .page-card p {
  margin: 0 0 12px;
}

/* responsive */
@media (max-width: 780px) {
  nav {
    flex-wrap: wrap;
    padding: 16px 16px 0;
    position: relative;
  }

  .logo {
    white-space: nowrap;
  }

  .nav-toggle {
    display: block;
    background: none;
    border: none;
    padding: 0;
    margin-left: auto;
    cursor: pointer;
    color: var(--ink);
  }

  .nav-links {
    display: none;
    position: static;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 0 8px;
    margin-top: 12px;
    border-top: 1px solid var(--paper-line);
    background: transparent;
    overflow: visible;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links > a,
  .nav-dropdown-toggle {
    width: 100%;
    padding: 10px 0;
    font-size: 15px;
    text-align: left;
    justify-content: space-between;
  }

  .nav-links > a {
    border-bottom: 1px solid var(--paper-line);
  }

  .nav-dropdown {
    width: 100%;
    border-bottom: 1px solid var(--paper-line);
  }

  .nav-dropdown-toggle svg {
    transition: transform 0.15s ease;
    flex-shrink: 0;
  }

  .nav-dropdown.open .nav-dropdown-toggle svg {
    transform: rotate(180deg);
  }

  .nav-dropdown-menu {
    position: static;
    left: auto;
    right: auto;
    transform: none;
    width: 100%;
    min-width: 0;
    max-width: none;
    margin: 0;
    padding: 0 0 8px 12px;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
    opacity: 1;
    visibility: visible;
    display: none;
  }

  .nav-dropdown.open .nav-dropdown-menu {
    display: block;
  }

  .nav-dropdown:hover .nav-dropdown-menu {
    display: none;
  }

  .nav-dropdown.open:hover .nav-dropdown-menu {
    display: block;
  }

  .nav-dropdown-menu a {
    padding: 8px 0;
    font-size: 14px;
    border-bottom: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-sitemap {
    grid-template-columns: 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-lead {
    font-size: 34px;
  }
}