:root {
  --sn-navy: #17355f;
  --sn-blue: #245f9e;
  --sn-blue-bright: #2f72bd;
  --sn-pink: #c95367;
  --sn-gold: #edae28;
  --sn-gold-deep: #cf8f00;
  --sn-cream: #fff7ed;
  --sn-bg: #edf4fb;
  --sn-bg-warm: #fff6ef;
  --sn-card: #ffffff;
  --sn-ink: #15253a;
  --sn-muted: #40536a;
  --sn-border: #c8d8e8;
  --sn-success: #16754a;
  --sn-warning: #a9560a;
  --sn-shadow: 0 12px 30px rgba(23, 53, 95, .14);
  --sn-shadow-strong: 0 16px 38px rgba(23, 53, 95, .2);
}

html { scroll-behavior: smooth; }

body {
  background: linear-gradient(180deg, var(--sn-bg) 0%, #f7f9fc 52%, var(--sn-bg-warm) 100%) !important;
  color: var(--sn-ink) !important;
  font-family: Arial, Helvetica, sans-serif !important;
}

body p,
body li,
body label,
body td,
body th,
body input,
body select,
body textarea {
  color: var(--sn-ink);
}

p,
.section-intro,
.card li,
.topic-card p,
.lesson-card p,
.form-card p,
.level-card p,
.path-card p,
.description,
.subtitle,
.hero-text {
  color: var(--sn-muted) !important;
}

h1, h2, h3, h4, h5, h6,
.logo,
.site-logo,
.brand {
  color: var(--sn-navy);
}

/* Announcement and global header */
.announcement-bar,
.announcement {
  background: linear-gradient(90deg, #efad1f, #ffd56c) !important;
  color: #1b2b40 !important;
  font-weight: 800 !important;
  border-bottom: 1px solid rgba(23, 53, 95, .16) !important;
}

.site-header,
header {
  background: rgba(255,255,255,.98) !important;
  border-bottom: 1px solid var(--sn-border) !important;
  box-shadow: 0 8px 24px rgba(23,53,95,.12) !important;
}

nav a,
.main-navigation a,
.site-nav a {
  color: #203650 !important;
  font-weight: 700 !important;
}

nav a:hover,
.main-navigation a:hover,
.site-nav a:hover,
nav a.active,
.main-navigation a.active {
  color: var(--sn-blue) !important;
}

/* Heroes: stronger colour and clearer text */
.hero,
.home-hero {
  background: linear-gradient(135deg, #17355f 0%, #245f9e 58%, #2f72bd 100%) !important;
  color: #fff !important;
}

.hero h1,
.hero h2,
.hero p,
.hero .hero-text,
.home-hero h1,
.home-hero p {
  color: #fff !important;
  text-shadow: 0 2px 8px rgba(0,0,0,.18);
}

.topics-hero,
.level-hero,
.page-hero,
.topic-hero,
.lesson-hero {
  background: linear-gradient(145deg, var(--page, #f5f9ff) 0%, color-mix(in srgb, var(--accent, #2474c8) 16%, white) 100%) !important;
  border-bottom: 1px solid #d7c5cc !important;
}

.topics-hero h1,
.level-hero h1,
.page-hero h1,
.topic-hero h1,
.lesson-hero h1,
.topic-hero h2,
.lesson-hero h2 {
  color: var(--sn-navy) !important;
  text-shadow: none !important;
}

.hero-tag,
.eyebrow,
.topic-label,
.lesson-number,
.badge {
  background: #fff !important;
  color: var(--sn-navy) !important;
  border: 1px solid #bfd0e2 !important;
  box-shadow: 0 5px 14px rgba(23,53,95,.1);
}

/* Cards and lesson sections */
.card,
.topic-card,
.form-card,
.level-card,
.lesson-card,
.lesson-section,
.section-card,
.path-card,
.featured-card,
.content-card,
.example-card,
.practice-card,
.quiz-card,
.info-card,
.summary-card,
.checkpoint-card,
.roadmap-card {
  background: var(--sn-card) !important;
  border: 1px solid var(--sn-border) !important;
  box-shadow: var(--sn-shadow) !important;
}

.card:hover,
.topic-card:hover,
.form-card:hover,
.level-card:hover,
.lesson-card:hover,
.path-card:hover {
  transform: translateY(-5px) !important;
  border-color: #e3a52a !important;
  box-shadow: var(--sn-shadow-strong) !important;
}

.topic-card,
.form-card,
.lesson-card,
.path-card {
  position: relative;
  overflow: hidden;
}

.topic-card::before,
.form-card::before,
.lesson-card::before,
.path-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 6px;
  background: linear-gradient(180deg, var(--sn-pink), var(--sn-gold));
}

/* Section headings and callouts */
.lesson-section > h2,
.section-card > h2,
.content-section > h2,
.lesson-content > section > h2 {
  color: #fff !important;
  background: linear-gradient(90deg, var(--sn-navy), var(--sn-blue)) !important;
  border-radius: 12px !important;
  padding: 13px 17px !important;
  margin-bottom: 20px !important;
  box-shadow: 0 8px 18px rgba(23,53,95,.16);
}

.tip-box,
.tip,
.did-you-know,
.info-box,
.note-box {
  background: #e6f2ff !important;
  border: 1px solid #9fc4ea !important;
  border-left: 6px solid var(--sn-blue) !important;
  color: #17324f !important;
}

.warning-box,
.common-mistake,
.mistake-box,
.alert-box {
  background: #fff0e2 !important;
  border: 1px solid #efb177 !important;
  border-left: 6px solid #d76f18 !important;
  color: #703209 !important;
}

.success-box,
.answer-feedback.correct,
.correct-answer {
  background: #e6f6ee !important;
  border-color: #7fc4a4 !important;
  color: #145a3c !important;
}

/* Buttons and links */
button,
.button,
.primary-button,
.topic-link,
.nav-button,
.cta-button,
.lesson-button,
.start-button,
a.button {
  min-height: 46px;
  border-radius: 12px !important;
  font-weight: 800 !important;
  letter-spacing: .01em;
  box-shadow: 0 7px 16px rgba(23,53,95,.16);
}

button,
.primary-button,
.topic-link,
.nav-button.primary,
.cta-button,
.start-button {
  background: linear-gradient(180deg, #f5bf45, var(--sn-gold)) !important;
  color: #182b43 !important;
  border: 1px solid #d69a18 !important;
}

button:hover,
.primary-button:hover,
.topic-link:hover,
.nav-button.primary:hover,
.cta-button:hover,
.start-button:hover {
  background: linear-gradient(180deg, #ffd56a, #efad1f) !important;
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(23,53,95,.22);
}

.secondary-button,
.nav-button:not(.primary),
.back-button {
  background: #fff !important;
  color: var(--sn-navy) !important;
  border: 2px solid #8fb2d5 !important;
}

input,
select,
textarea {
  background: #fff !important;
  border: 2px solid #b9ccdf !important;
  color: var(--sn-ink) !important;
  box-shadow: inset 0 1px 2px rgba(23,53,95,.05);
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(47,114,189,.2) !important;
  border-color: var(--sn-blue-bright) !important;
}

/* Footer and lesson endings */
.site-footer,
footer {
  background: #17355f !important;
  color: #fff !important;
  border-top: 5px solid var(--sn-gold) !important;
}

.site-footer p,
.site-footer a,
footer p,
footer a,
footer h3,
footer h4 {
  color: #fff !important;
}

.lesson-navigation {
  margin-top: 36px !important;
  padding: 22px !important;
  background: #e8f1fa !important;
  border: 1px solid #bfd1e2 !important;
  border-radius: 18px !important;
  box-shadow: var(--sn-shadow) !important;
}

/* Progress and floating controls */
.sn-reading-progress {
  position: fixed;
  left: 0;
  top: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--sn-pink), var(--sn-gold));
  width: 0;
  z-index: 10000;
  box-shadow: 0 1px 7px rgba(0,0,0,.22);
}

.sn-scroll-controls {
  position: fixed;
  right: 18px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}

.sn-scroll-button {
  width: 48px;
  height: 48px;
  min-height: 48px;
  border-radius: 50% !important;
  border: 2px solid rgba(255,255,255,.95) !important;
  background: var(--sn-navy) !important;
  color: #fff !important;
  box-shadow: 0 9px 22px rgba(23,53,95,.32) !important;
  font-size: 19px;
  display: grid;
  place-items: center;
  padding: 0;
}

.sn-scroll-button:hover {
  background: var(--sn-pink) !important;
  transform: translateY(-2px);
}

.sn-scroll-button[hidden] { display: none; }
.sn-new-badge {
  display: inline-flex;
  padding: 5px 10px;
  border-radius: 999px;
  background: #ffe0e6;
  color: #7c2637;
  border: 1px solid #e8a2ae;
  font-size: .75rem;
  font-weight: 800;
  margin-left: 8px;
}

/* Mobile-first contrast */
@media (max-width: 760px) {
  body {
    background: linear-gradient(180deg, #e6f0fa 0%, #f8f9fb 48%, #fff1e7 100%) !important;
    color: #112239 !important;
  }

  .site-header,
  header {
    box-shadow: 0 9px 26px rgba(23,53,95,.18) !important;
  }

  .main-navigation {
    gap: 8px !important;
    overflow-x: auto !important;
    white-space: nowrap !important;
    padding-bottom: 5px !important;
  }

  .main-navigation a,
  nav a {
    background: #fff !important;
    border: 1px solid #aebfd2 !important;
    border-radius: 999px !important;
    padding: 10px 13px !important;
    box-shadow: 0 4px 10px rgba(23,53,95,.08);
  }

  .topics-hero,
  .level-hero,
  .page-hero,
  .topic-hero,
  .lesson-hero {
    background: linear-gradient(145deg, var(--page, #f5f9ff) 0%, color-mix(in srgb, var(--accent, #2474c8) 20%, white) 100%) !important;
  }

  .card,
  .topic-card,
  .form-card,
  .level-card,
  .lesson-card,
  .lesson-section,
  .section-card,
  .path-card,
  .content-card,
  .example-card,
  .practice-card,
  .quiz-card {
    border-width: 1.5px !important;
    box-shadow: 0 13px 30px rgba(23,53,95,.17) !important;
  }

  h1 { line-height: 1.15 !important; }
  h2, h3 { line-height: 1.25 !important; }
  p, li { line-height: 1.65 !important; }

  button,
  .button,
  .primary-button,
  .topic-link,
  .nav-button,
  .cta-button,
  .lesson-button,
  .start-button {
    min-height: 48px;
    font-size: .98rem !important;
  }

  .sn-scroll-controls { right: 13px; bottom: 15px; }
  .sn-scroll-button { width: 46px; height: 46px; min-height: 46px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}