@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Sora:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --bg-950: #040b14;
  --bg-900: #071523;
  --bg-850: #0b1d2d;
  --bg-800: #10263a;
  --surface: rgba(16, 38, 58, 0.82);
  --surface-strong: rgba(18, 45, 68, 0.95);
  --line: rgba(64, 128, 162, 0.45);
  --text: #e9f6ff;
  --muted: #9ec0d5;
  --accent: #21d4be;
  --accent-alt: #3ba7ff;
  --warm: #ffbe5a;
  --danger: #ff7c6e;
  --success: #55d38b;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --radius-sm: 12px;
  --max-width: 1220px;
  --header-bg: linear-gradient(180deg, rgba(4, 11, 20, 0.92), rgba(4, 11, 20, 0.72));
  --header-border: rgba(85, 145, 176, 0.2);
  --menu-chip-bg: rgba(8, 24, 37, 0.9);
  --menu-chip-border: rgba(117, 173, 204, 0.34);
  --menu-chip-text: #c9e5f7;
  --card-bg: linear-gradient(160deg, rgba(11, 31, 47, 0.95), rgba(8, 21, 34, 0.92));
  --topic-dropdown-bg: rgba(7, 24, 38, 0.92);
  --topic-dropdown-border: rgba(113, 180, 211, 0.35);
  --copy: #c0dcf0;
  --copy-strong: #d3ecfb;
  --copy-card: #bbd7ea;
  --copy-card-strong: #cfe8f8;
  --field-label: #b5d4e8;
  --footer-link: #bcdbef;
  --meta-text: #8fb1c7;
  --mobile-nav-bg: rgba(4, 11, 20, 0.95);
  --mobile-nav-border: rgba(97, 171, 203, 0.38);
  --mega-menu-bg: linear-gradient(165deg, rgba(9, 26, 41, 0.99), rgba(5, 15, 25, 0.99));
  --mega-link-bg: rgba(10, 29, 45, 0.88);
}

:root[data-theme='light'] {
  --bg-950: #eff5fa;
  --bg-900: #f7fbff;
  --bg-850: #eef6fd;
  --bg-800: #e7f1fa;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --line: rgba(90, 140, 170, 0.25);
  --text: #102233;
  --muted: #48677d;
  --accent: #008f84;
  --accent-alt: #0e6ec9;
  --shadow: 0 14px 28px rgba(21, 52, 76, 0.12);
  --header-bg: linear-gradient(180deg, rgba(241, 248, 255, 0.95), rgba(236, 245, 253, 0.82));
  --header-border: rgba(83, 131, 162, 0.25);
  --menu-chip-bg: #dde8f2;
  --menu-chip-border: rgba(92, 134, 162, 0.35);
  --menu-chip-text: #183244;
  --card-bg: linear-gradient(160deg, rgba(255, 255, 255, 0.98), rgba(244, 250, 255, 0.95));
  --topic-dropdown-bg: rgba(248, 253, 255, 0.96);
  --topic-dropdown-border: rgba(90, 140, 170, 0.32);
  --copy: #28465d;
  --copy-strong: #1b3449;
  --copy-card: #294a62;
  --copy-card-strong: #1b3449;
  --field-label: #294961;
  --footer-link: #2d4e66;
  --meta-text: #41627a;
  --mobile-nav-bg: rgba(245, 251, 255, 0.98);
  --mobile-nav-border: rgba(83, 131, 162, 0.3);
  --mega-menu-bg: linear-gradient(165deg, rgba(246, 252, 255, 0.99), rgba(239, 247, 255, 0.99));
  --mega-link-bg: rgba(233, 245, 253, 0.95);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Manrope', sans-serif;
  color: var(--text);
  background:
    radial-gradient(1400px 700px at -10% -20%, rgba(59, 167, 255, 0.16), transparent 58%),
    radial-gradient(1200px 700px at 105% -25%, rgba(33, 212, 190, 0.16), transparent 55%),
    linear-gradient(180deg, var(--bg-900) 0%, var(--bg-950) 100%);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.25s ease, color 0.25s ease;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(transparent 96%, rgba(64, 128, 162, 0.16) 100%),
    linear-gradient(90deg, transparent 96%, rgba(64, 128, 162, 0.12) 100%);
  background-size: 36px 36px;
  opacity: 0.22;
  z-index: -1;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  z-index: 1200;
}

.reading-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-alt) 100%);
  box-shadow: 0 0 16px rgba(59, 167, 255, 0.8);
}

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 4px;
  z-index: 1000;
  padding: 0.85rem 0;
  backdrop-filter: blur(12px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-family: 'Sora', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.4px;
}

.brand-chip {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background:
    radial-gradient(circle at 30% 30%, #68efff, transparent 55%),
    linear-gradient(145deg, #1e5f8b, #123654);
  border: 1px solid rgba(152, 222, 255, 0.38);
  position: relative;
  box-shadow: inset 0 0 14px rgba(82, 186, 255, 0.45), 0 8px 15px rgba(0, 0, 0, 0.28);
}

.brand-chip::after {
  content: '';
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 4px;
}

.mobile-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 11px;
  border: 1px solid rgba(143, 192, 213, 0.25);
  background: rgba(7, 21, 35, 0.82);
  color: var(--text);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  padding: 0.72rem 0.9rem;
  border-radius: 10px;
  font-weight: 600;
  color: var(--muted);
  transition: 0.24s ease;
}

.nav-item > .nav-link.has-menu {
  background: var(--menu-chip-bg);
  border: 1px solid var(--menu-chip-border);
  color: var(--menu-chip-text);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.active,
.nav-item.active > .nav-link {
  color: var(--text);
  background: rgba(33, 212, 190, 0.12);
}

.nav-item.active > .nav-link.has-menu {
  background: rgba(6, 23, 36, 0.96);
  border-color: rgba(120, 191, 226, 0.48);
}

:root[data-theme='light'] .nav-item.active > .nav-link.has-menu {
  background: #d5e2ee;
}

.nav-link.has-menu::after {
  content: '▾';
  font-size: 0.85rem;
  margin-left: 0.35rem;
}

.mega-menu {
  position: absolute;
  top: calc(100% + 0.65rem);
  left: 0;
  min-width: 360px;
  background: var(--mega-menu-bg);
  border: 1px solid rgba(107, 188, 223, 0.32);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: none;
  grid-template-columns: repeat(2, minmax(130px, 1fr));
  gap: 0.6rem;
  box-shadow: var(--shadow);
}

.mega-menu a {
  display: block;
  padding: 0.62rem 0.7rem;
  border-radius: 10px;
  color: var(--text);
  font-size: 0.95rem;
  border: 1px solid transparent;
  background: var(--mega-link-bg);
}

.mega-menu a:hover,
.mega-menu a:focus-visible {
  border-color: rgba(97, 199, 244, 0.45);
  background: rgba(33, 212, 190, 0.16);
}

.nav-item.open .mega-menu,
.nav-item:focus-within .mega-menu {
  display: grid;
}

.search-shell {
  width: min(330px, 100%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid rgba(98, 163, 199, 0.35);
  background: rgba(9, 26, 41, 0.8);
  border-radius: 999px;
  padding: 0.45rem 0.65rem 0.45rem 0.85rem;
}

.search-shell input {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 0.92rem;
}

.search-shell input::placeholder {
  color: #7ea7bf;
}

.search-shell input:focus {
  outline: none;
}

.search-shell span {
  color: #83b7d4;
  font-size: 0.85rem;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid rgba(116, 182, 214, 0.45);
  background: rgba(8, 25, 40, 0.86);
  color: #d0ecff;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  transition: 0.2s ease;
}

.theme-toggle:hover {
  background: rgba(19, 44, 67, 0.92);
}

.main {
  padding-bottom: 4rem;
}

.hero {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(88, 159, 194, 0.35);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 12% 15%, rgba(59, 167, 255, 0.22), transparent 45%),
    radial-gradient(circle at 88% 22%, rgba(33, 212, 190, 0.18), transparent 42%),
    linear-gradient(145deg, rgba(9, 29, 45, 0.96), rgba(7, 18, 30, 0.96));
  margin-top: 1.8rem;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.03) 0 2px, transparent 2px 52px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.02) 0 2px, transparent 2px 46px);
  opacity: 0.45;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 1rem;
  padding: 3.2rem;
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: 'Sora', sans-serif;
  line-height: 1.18;
  font-size: clamp(1.8rem, 4vw, 3.1rem);
}

.hero p {
  margin: 0;
  max-width: 62ch;
  color: var(--copy);
  font-size: 1.05rem;
}

.hero-chipset {
  display: grid;
  gap: 0.8rem;
  align-content: start;
}

.chip-card {
  border: 1px solid rgba(118, 187, 220, 0.32);
  border-radius: 14px;
  background: rgba(10, 29, 45, 0.78);
  padding: 0.95rem;
  font-size: 0.94rem;
  color: var(--copy-strong);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.35rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.76rem 1.1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 0.93rem;
  transition: 0.25s ease;
}

.btn-primary {
  color: #00282f;
  background: linear-gradient(90deg, #25e2ca, #6df3ff);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 20px rgba(16, 188, 185, 0.32);
}

.btn-secondary {
  color: var(--text);
  border-color: rgba(122, 192, 225, 0.45);
  background: rgba(13, 35, 54, 0.75);
}

.btn-secondary:hover {
  border-color: rgba(146, 224, 255, 0.7);
  background: rgba(22, 52, 79, 0.9);
}

.section {
  margin-top: 2rem;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section h2,
.section h3 {
  margin: 0;
  font-family: 'Sora', sans-serif;
}

.kicker {
  margin: 0 0 0.35rem;
  color: var(--accent);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid rgba(106, 182, 217, 0.28);
  border-radius: var(--radius-sm);
  padding: 1rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(59, 167, 255, 0.08), transparent 35% 65%, rgba(33, 212, 190, 0.08));
  pointer-events: none;
}

.card h3,
.card h4 {
  margin-top: 0;
  margin-bottom: 0.55rem;
  font-family: 'Sora', sans-serif;
}

.card p {
  margin: 0;
  color: var(--copy-card);
}

.card ul {
  margin: 0.65rem 0 0;
  padding-left: 1.1rem;
}

.card li {
  margin-bottom: 0.35rem;
  color: var(--copy-card-strong);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.level-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.24rem 0.65rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.3px;
  margin-bottom: 0.6rem;
}

.level-beginner { background: rgba(85, 211, 139, 0.18); color: #8ceab0; border: 1px solid rgba(85, 211, 139, 0.42); }
.level-intermediate { background: rgba(59, 167, 255, 0.18); color: #86cbff; border: 1px solid rgba(59, 167, 255, 0.46); }
.level-advanced { background: rgba(255, 190, 90, 0.16); color: #ffd493; border: 1px solid rgba(255, 190, 90, 0.42); }
.level-expert { background: rgba(255, 124, 110, 0.15); color: #ffb6ae; border: 1px solid rgba(255, 124, 110, 0.4); }

.circuit-divider {
  margin: 1.35rem 0;
  height: 24px;
  position: relative;
}

.circuit-divider::before,
.circuit-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  border-top: 1px dashed rgba(105, 179, 212, 0.5);
}

.circuit-divider::after {
  width: 26%;
  left: 37%;
  border-top-style: solid;
  border-top-width: 2px;
  border-top-color: rgba(33, 212, 190, 0.72);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1rem;
}

.filter-btn {
  border: 1px solid rgba(101, 177, 209, 0.45);
  background: rgba(9, 28, 44, 0.82);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.48rem 0.82rem;
  font-size: 0.82rem;
  font-weight: 700;
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--text);
  background: rgba(33, 212, 190, 0.18);
  border-color: rgba(120, 224, 236, 0.78);
}

[data-search-item],
[data-filter-item] {
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.is-hidden {
  display: none !important;
}

.roadmap {
  border-left: 2px solid rgba(114, 193, 228, 0.45);
  margin-left: 0.65rem;
  padding-left: 1rem;
}

.roadmap-step {
  position: relative;
  margin-bottom: 1.15rem;
  padding: 0.45rem 0 0.45rem 0.35rem;
}

.roadmap-step::before {
  content: '';
  position: absolute;
  left: -1.46rem;
  top: 0.8rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--accent), var(--accent-alt));
  box-shadow: 0 0 0 4px rgba(33, 212, 190, 0.16);
}

.roadmap-step h4 {
  margin: 0 0 0.4rem;
}

.foundation-list {
  margin: 0.65rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.35rem 1rem;
}

.foundation-list li {
  color: var(--copy-card-strong);
  margin-bottom: 0.2rem;
}

.topic-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 0.7rem;
}

.topic-pill {
  border: 1px solid rgba(95, 170, 204, 0.34);
  background: rgba(8, 25, 39, 0.8);
  padding: 0.6rem 0.65rem;
  border-radius: 11px;
  font-size: 0.86rem;
  color: #c5e0f2;
}

.topic-stack {
  display: grid;
  gap: 0.75rem;
}

.topic-dropdown {
  border: 1px solid var(--topic-dropdown-border);
  background: var(--topic-dropdown-bg);
  border-radius: 12px;
  padding: 0.2rem 0.8rem 0.8rem;
}

.topic-dropdown summary {
  cursor: pointer;
  list-style: none;
  padding: 0.85rem 0;
  font-family: 'Sora', sans-serif;
  font-size: 0.98rem;
  color: var(--text);
}

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

.topic-dropdown summary::after {
  content: '+';
  float: right;
  color: var(--accent);
  font-size: 1.05rem;
}

.topic-dropdown[open] summary::after {
  content: '−';
}

.topic-dropdown p {
  margin: 0 0 0.5rem;
  color: #bfd9eb;
}

.topic-dropdown ul {
  margin: 0;
  padding-left: 1.1rem;
}

.topic-dropdown li {
  color: #d4eaf9;
  margin-bottom: 0.35rem;
}

.blog-hero {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(105, 180, 214, 0.45);
  min-height: 290px;
  display: grid;
  align-content: end;
  padding: 1.6rem;
  background:
    linear-gradient(30deg, rgba(3, 12, 22, 0.92), rgba(7, 25, 39, 0.38)),
    radial-gradient(circle at 20% 20%, rgba(33, 212, 190, 0.42), transparent 38%),
    radial-gradient(circle at 75% 35%, rgba(59, 167, 255, 0.32), transparent 41%),
    linear-gradient(145deg, #072036, #103f58);
  position: relative;
}

.blog-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(120deg, rgba(255, 255, 255, 0.04) 0 2px, transparent 2px 42px);
  pointer-events: none;
}

.blog-hero h1 {
  margin: 0;
  position: relative;
  z-index: 1;
  font-family: 'Sora', sans-serif;
  font-size: clamp(1.7rem, 3.2vw, 2.7rem);
}

.blog-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1.2rem;
}

.blog-block {
  border: 1px solid rgba(107, 179, 211, 0.35);
  background: rgba(10, 29, 45, 0.84);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.blog-block h2,
.blog-block h3 {
  margin-top: 0;
}

.faq-item {
  margin-bottom: 0.9rem;
}

.faq-item h4 {
  margin-bottom: 0.35rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field label {
  font-size: 0.84rem;
  color: var(--field-label);
}

.field input,
.field textarea,
.field select {
  border: 1px solid rgba(110, 183, 215, 0.36);
  border-radius: 10px;
  background: rgba(9, 24, 37, 0.85);
  color: var(--text);
  font-family: inherit;
  padding: 0.65rem 0.75rem;
}

.field textarea {
  resize: vertical;
  min-height: 130px;
}

.newsletter {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
  margin-top: 0.8rem;
}

.newsletter input {
  flex: 1;
  min-width: 220px;
  border-radius: 999px;
  border: 1px solid rgba(110, 183, 215, 0.4);
  background: rgba(9, 24, 37, 0.85);
  color: var(--text);
  padding: 0.65rem 0.9rem;
}

.site-footer {
  margin-top: 2.4rem;
  border-top: 1px solid rgba(91, 160, 193, 0.34);
  background: rgba(4, 11, 20, 0.9);
  padding: 1.6rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr 0.85fr;
  gap: 1rem;
}

.footer-grid h4 {
  margin-top: 0;
  margin-bottom: 0.55rem;
  font-family: 'Sora', sans-serif;
}

.footer-links {
  display: grid;
  gap: 0.35rem;
}

.footer-links a {
  color: var(--footer-link);
  font-size: 0.93rem;
}

.footer-links a:hover {
  color: #e6f7ff;
}

.meta-strip {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(91, 160, 193, 0.34);
  color: var(--meta-text);
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

.no-results {
  margin-top: 0.8rem;
  color: #a7c6d9;
  font-size: 0.88rem;
  display: none;
}

.section-tinyml .hero,
.section-edgeai .hero {
  border-color: rgba(84, 152, 185, 0.5);
  background:
    radial-gradient(circle at 14% 16%, rgba(20, 104, 140, 0.35), transparent 50%),
    radial-gradient(circle at 84% 20%, rgba(8, 87, 96, 0.34), transparent 45%),
    linear-gradient(145deg, rgba(4, 15, 24, 0.98), rgba(2, 10, 18, 0.98));
}

.section-tinyml .card,
.section-edgeai .card {
  background: linear-gradient(170deg, rgba(5, 19, 30, 0.98), rgba(3, 13, 22, 0.96));
  border-color: rgba(77, 146, 180, 0.42);
}

:root[data-theme='light'] body {
  background:
    radial-gradient(1400px 700px at -10% -20%, rgba(75, 164, 222, 0.2), transparent 58%),
    radial-gradient(1200px 700px at 105% -25%, rgba(0, 143, 132, 0.16), transparent 55%),
    linear-gradient(180deg, #f7fbff 0%, #edf4fb 100%);
}

:root[data-theme='light'] body::before {
  background-image:
    linear-gradient(transparent 96%, rgba(90, 140, 170, 0.1) 100%),
    linear-gradient(90deg, transparent 96%, rgba(90, 140, 170, 0.08) 100%);
  opacity: 0.25;
}

:root[data-theme='light'] .hero p,
:root[data-theme='light'] .card p,
:root[data-theme='light'] .card li,
:root[data-theme='light'] .topic-pill,
:root[data-theme='light'] .field label,
:root[data-theme='light'] .footer-links a,
:root[data-theme='light'] .meta-strip {
  color: #35556b;
}

:root[data-theme='light'] .hero,
:root[data-theme='light'] .chip-card,
:root[data-theme='light'] .search-shell,
:root[data-theme='light'] .mega-menu,
:root[data-theme='light'] .blog-block,
:root[data-theme='light'] .site-footer,
:root[data-theme='light'] .topic-pill,
:root[data-theme='light'] .filter-btn,
:root[data-theme='light'] .field input,
:root[data-theme='light'] .field textarea,
:root[data-theme='light'] .field select,
:root[data-theme='light'] .newsletter input {
  background: rgba(255, 255, 255, 0.92);
  border-color: rgba(84, 132, 162, 0.3);
}

:root[data-theme='light'] .mega-menu a {
  background: rgba(238, 246, 253, 0.96);
  color: #1f394d;
}

:root[data-theme='light'] .search-shell span,
:root[data-theme='light'] .search-shell input::placeholder {
  color: #4f6f86;
}

:root[data-theme='light'] .level-beginner {
  background: rgba(42, 159, 115, 0.14);
  color: #0f694b;
  border-color: rgba(42, 159, 115, 0.42);
}

:root[data-theme='light'] .level-intermediate {
  background: rgba(35, 120, 196, 0.14);
  color: #14518a;
  border-color: rgba(35, 120, 196, 0.4);
}

:root[data-theme='light'] .level-advanced {
  background: rgba(191, 123, 25, 0.14);
  color: #84510d;
  border-color: rgba(191, 123, 25, 0.35);
}

:root[data-theme='light'] .level-expert {
  background: rgba(186, 73, 57, 0.13);
  color: #7c2b1f;
  border-color: rgba(186, 73, 57, 0.35);
}

:root[data-theme='light'] .btn-secondary {
  color: #123048;
  background: rgba(236, 246, 255, 0.96);
  border-color: rgba(84, 132, 162, 0.4);
}

:root[data-theme='light'] .theme-toggle {
  background: rgba(239, 247, 255, 0.98);
  color: #25465e;
  border-color: rgba(84, 132, 162, 0.45);
}

:root[data-theme='light'] .section-tinyml .hero,
:root[data-theme='light'] .section-edgeai .hero {
  background:
    radial-gradient(circle at 14% 16%, rgba(80, 145, 185, 0.22), transparent 50%),
    radial-gradient(circle at 84% 20%, rgba(47, 132, 140, 0.22), transparent 45%),
    linear-gradient(145deg, rgba(241, 248, 255, 0.96), rgba(233, 243, 252, 0.96));
}

:root[data-theme='light'] .section-tinyml .card,
:root[data-theme='light'] .section-edgeai .card {
  background: rgba(251, 254, 255, 0.98);
}

@media (max-width: 1060px) {
  .hero-grid {
    grid-template-columns: 1fr;
    padding: 2.4rem;
  }

  .search-shell {
    width: min(230px, 100%);
  }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-8 {
    grid-column: span 6;
  }

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

@media (max-width: 860px) {
  .mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: 0.45rem;
  }

  .search-shell {
    display: none;
  }

  .theme-toggle {
    margin-left: auto;
  }

  .main-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 1rem;
    right: 1rem;
    background: var(--mobile-nav-bg);
    border: 1px solid var(--mobile-nav-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    flex-direction: column;
    align-items: stretch;
    display: none;
  }

  .site-header.menu-open .main-nav {
    display: flex;
  }

  .nav-link {
    display: flex;
    justify-content: space-between;
  }

  .mega-menu {
    position: static;
    min-width: 0;
    margin-top: 0.5rem;
    box-shadow: none;
    border-radius: 10px;
  }

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

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-8,
  .span-12 {
    grid-column: span 12;
  }
}

@media (max-width: 520px) {
  .hero-grid {
    padding: 1.4rem;
  }

  .container {
    width: min(var(--max-width), calc(100% - 1rem));
  }
}