/* === Reset & Base === */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --sky: #8ecae6;
  --sky-light: #d4edf8;
  --sand: #f5deb3;
  --sand-light: #fdf3e0;
  --ink: #2b2d42;
  --ink-light: #555b6e;
  --white: #fefefe;
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  font-size: 17px;
}

a {
  color: var(--ink);
  text-decoration-color: var(--sky);
  text-underline-offset: 3px;
  transition: color 0.2s;
}

a:hover {
  color: #1a6fa0;
}

/* === Layout === */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Header / Hero === */
.hero {
  background: linear-gradient(135deg, var(--sand-light) 0%, var(--sky-light) 100%);
  padding: 80px 0 60px;
  text-align: center;
}

.hero__logo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--white);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  margin-bottom: 24px;
}

.hero h1 {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.hero h1 .lambda {
  color: #3a9fbf;
}

.hero__tagline {
  font-size: 1.15rem;
  color: var(--ink-light);
  max-width: 560px;
  margin: 0 auto 32px;
}

.hero__cta {
  display: inline-block;
  background: var(--sky);
  color: var(--ink);
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}

.hero__cta:hover {
  background: #6fb8d9;
  color: var(--ink);
  transform: translateY(-1px);
}

.hero__next-event {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(142, 202, 230, 0.4);
  border-radius: var(--radius);
  padding: 24px 32px;
  max-width: 520px;
  margin: 0 auto;
}

.hero__next-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #3a9fbf;
  margin-bottom: 8px;
}

.hero__next-title {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  margin-bottom: 4px;
}

.hero__next-title:hover {
  color: #1a6fa0;
}

.hero__next-desc {
  color: var(--ink-light);
  font-size: 0.92rem;
  margin-bottom: 16px;
}

/* === Nav === */
.nav {
  background: var(--white);
  border-bottom: 1px solid #e8e8e8;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}

.nav__brand {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-weight: 700;
  font-size: 1.2rem;
  text-decoration: none;
}

.nav__links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav__links a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-light);
  transition: color 0.2s;
}

.nav__links a:hover {
  color: var(--ink);
}

/* === Sections === */
section {
  padding: 64px 0;
}

section:nth-child(even) {
  background: var(--sand-light);
}

.section__title {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.section__subtitle {
  color: var(--ink-light);
  margin-bottom: 40px;
  max-width: 600px;
}

/* === About === */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 32px;
}

.about__card {
  background: var(--white);
  border: 1px solid #e8e8e8;
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow 0.2s;
}

.about__card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.about__card h3 {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.about__card .icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
  display: block;
}

/* === Topics === */
.topics__list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.topic-tag {
  background: var(--sky-light);
  border: 1px solid var(--sky);
  border-radius: 24px;
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

/* === Workshops / Events === */
.events__list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.event-card {
  background: var(--white);
  border: 1px solid #e8e8e8;
  border-radius: var(--radius);
  padding: 24px 28px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: box-shadow 0.2s, border-color 0.2s;
  text-decoration: none;
  color: var(--ink);
}

.event-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  border-color: var(--sky);
  color: var(--ink);
}

.event-card--upcoming {
  border-color: var(--sky);
  background: var(--sky-light);
}

.event-card--upcoming .event-card__date {
  background: var(--sky);
  color: var(--white);
}

.event-card__date {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 0.85rem;
  color: var(--ink-light);
  background: var(--sand-light);
  border-radius: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  text-align: center;
  min-width: 90px;
}

.event-card__content h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.event-card__content p {
  color: var(--ink-light);
  font-size: 0.92rem;
}

/* === Join / CTA === */
.join {
  text-align: center;
  background: linear-gradient(135deg, var(--sky-light) 0%, var(--sand-light) 100%);
}

.join__links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.join__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--white);
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 12px 24px;
  text-decoration: none;
  font-weight: 500;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.join__link:hover {
  border-color: var(--sky);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  color: var(--ink);
}

/* === Footer === */
.footer {
  background: var(--ink);
  color: #c0c0c0;
  padding: 32px 0;
  text-align: center;
  font-size: 0.88rem;
}

.footer a {
  color: var(--sky);
}

/* === Code decoration === */
.code-bg {
  position: relative;
  overflow: hidden;
}

.code-bg > * {
  position: relative;
  z-index: 1;
}

.code-snippets {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 16px;
  padding: 20px;
  opacity: 0.45;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 30%, transparent 75%);
}

.code-snippets pre {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  line-height: 1.5;
  white-space: pre;
  overflow: hidden;
  margin: 0;
  text-align: left;
}

/* Syntax highlighting colors */
.code-snippets .kw { color: #7c3aed; }     /* keywords - purple */
.code-snippets .fn { color: #2563eb; }     /* functions - blue */
.code-snippets .ty { color: #0891b2; }     /* types - teal */
.code-snippets .str { color: #16a34a; }    /* strings - green */
.code-snippets .num { color: #dc2626; }    /* numbers - red */
.code-snippets .op { color: #9333ea; }     /* operators - violet */
.code-snippets .cm { color: #6b7280; font-style: italic; } /* comments - gray */
.code-snippets .var { color: #1e3a5f; }    /* variables - dark blue */

@media (max-width: 700px) {
  .code-snippets {
    grid-template-columns: 1fr 1fr;
    font-size: 0.5rem;
  }
}

/* === Responsive === */
@media (max-width: 700px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero__logo {
    width: 120px;
    height: 120px;
  }

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

  .event-card {
    flex-direction: column;
  }

  .nav__links {
    gap: 16px;
  }
}