/* ============================================================
   Teach Each Other AI — stylesheet
   Dark navy + cyan palette matched from the meetup posters.
   ============================================================ */

:root {
  --bg-deep: #070B12;            /* darkest, from teoai2 background  */
  --bg-main: #0B1224;            /* deep navy, from teoai1 background */
  --bg-card: #0F1A30;
  --cyan: #10BAD5;               /* primary accent from teoai1        */
  --cyan-bright: #0FC6DA;
  --cyan-soft: #4DE3FF;
  --cyan-deep: #0A8FB0;
  --cyan-glow: rgba(16, 186, 213, 0.35);
  --text: #F1F1F3;
  --text-muted: #9AA6C2;
  --border: rgba(16, 186, 213, 0.16);
  --border-soft: rgba(241, 241, 243, 0.08);
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

html {
  scroll-padding-top: 84px;      /* keep anchored sections clear of the fixed navbar */
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-deep);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
}

::selection {
  background: rgba(16, 186, 213, 0.35);
  color: #fff;
}

/* ===== Shared bits ===== */

.eyebrow {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.9rem;
}

.section { padding: 5.5rem 0; }

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.section-text {
  color: var(--text-muted);
  line-height: 1.75;
}

.text-gradient {
  background: linear-gradient(100deg, var(--cyan) 0%, var(--cyan-soft) 55%, #8AEAFF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.poster-quote {
  color: var(--cyan);
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.note {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== Buttons ===== */

.btn-cyan {
  --bs-btn-color: #04121A;
  background: linear-gradient(135deg, var(--cyan), var(--cyan-deep));
  color: #04121A;
  border: none;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(16, 186, 213, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.btn-cyan:hover,
.btn-cyan:focus {
  color: #04121A;
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(16, 186, 213, 0.38);
  filter: brightness(1.07);
}

.btn-outline-cyan {
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn-outline-cyan:hover,
.btn-outline-cyan:focus {
  background: rgba(16, 186, 213, 0.12);
  color: var(--cyan-bright);
  border-color: var(--cyan-bright);
  transform: translateY(-2px);
}

/* ===== Navbar ===== */

.navbar {
  background: rgba(7, 11, 18, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
  padding-top: 0.8rem;
  padding-bottom: 0.8rem;
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

.navbar.scrolled {
  background: rgba(7, 11, 18, 0.94);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.navbar-brand:hover { color: var(--text); }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.6rem;
  background: linear-gradient(135deg, var(--cyan), var(--cyan-deep));
  color: #04121A;
  font-size: 1rem;
  box-shadow: 0 0 18px var(--cyan-glow);
}

.brand-ai { color: var(--cyan); }

.navbar .nav-link {
  color: var(--text-muted);
  font-weight: 500;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--cyan);
}

.navbar-toggler {
  border-color: var(--border);
}

.navbar-toggler:focus { box-shadow: 0 0 0 3px rgba(16, 186, 213, 0.25); }

/* ===== Hero ===== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 7.5rem 0 5rem;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(60rem 40rem at 85% 10%, rgba(16, 186, 213, 0.14), transparent 60%),
    radial-gradient(50rem 35rem at 10% 90%, rgba(10, 143, 176, 0.10), transparent 60%),
    linear-gradient(180deg, var(--bg-main) 0%, var(--bg-deep) 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(16, 186, 213, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 186, 213, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(70rem 50rem at 50% 30%, #000, transparent 75%);
  mask-image: radial-gradient(70rem 50rem at 50% 30%, #000, transparent 75%);
  pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.hero-lead {
  color: var(--text-muted);
  font-size: 1.15rem;
  line-height: 1.7;
  max-width: 36rem;
}

.hero-lead strong { color: var(--text); }

.hero-tags .tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 186, 213, 0.08);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.hero-tags .tag i { color: var(--cyan); }

/* ===== Next-meetup card ===== */

.meetup-card {
  background: linear-gradient(180deg, rgba(17, 28, 54, 0.85), rgba(11, 18, 36, 0.9));
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  padding: 2rem 1.75rem;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.badge-cyan {
  background: rgba(16, 186, 213, 0.12);
  color: var(--cyan-bright);
  border: 1px solid var(--border);
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.meetup-date {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

.meetup-meta li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  color: var(--text-muted);
  margin-bottom: 0.55rem;
}

.meetup-meta i { color: var(--cyan); }

/* Compact map links (hero meetup card, footer) */

.location-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  background: rgba(16, 186, 213, 0.08);
  color: var(--cyan);
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.location-link:hover,
.location-link:focus {
  background: rgba(16, 186, 213, 0.18);
  border-color: var(--cyan);
  color: var(--cyan-bright);
  transform: translateY(-1px);
}

.countdown {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.countdown-item {
  background: rgba(7, 11, 18, 0.6);
  border: 1px solid var(--border-soft);
  border-radius: 0.9rem;
  padding: 0.8rem 0.4rem;
  text-align: center;
}

.cd-num {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.9rem;
  color: var(--cyan-bright);
  line-height: 1;
}

.cd-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Live-link slot in the meetup card */

.live-placeholder {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  background: rgba(16, 186, 213, 0.06);
  border: 1px dashed var(--border);
  border-radius: 0.9rem;
  padding: 0.9rem 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.live-placeholder i {
  color: var(--cyan);
  font-size: 1.2rem;
  flex: 0 0 auto;
}

.pulse-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--cyan-bright);
  display: inline-block;
  animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ===== About ===== */

.about {
  background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-main) 100%);
}

.about-principles { max-width: 34rem; }

.principle {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-soft);
}

.principle:last-child { border-bottom: 0; }

.principle-icon {
  flex: 0 0 auto;
  width: 2.75rem;
  height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.8rem;
  background: rgba(16, 186, 213, 0.1);
  border: 1px solid var(--border);
  color: var(--cyan);
  font-size: 1.15rem;
}

.principle h3 { font-size: 1.05rem; margin-bottom: 0.2rem; }

.principle p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 0;
}

.how-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.75rem;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

.step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.1rem;
}

.step:last-of-type { margin-bottom: 0; }

.step-num {
  flex: 0 0 auto;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--cyan-deep));
  color: #04121A;
  font-weight: 700;
  font-family: var(--font-heading);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.step h4 { font-size: 1rem; margin-bottom: 0.15rem; }

.step p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ===== When & Where ===== */

.when-where {
  background: linear-gradient(180deg, var(--bg-main) 0%, var(--bg-deep) 100%);
}

.info-card {
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.75rem;
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.info-card:hover {
  transform: translateY(-4px);
  border-color: rgba(16, 186, 213, 0.4);
}

.info-card-icon {
  display: inline-block;
  font-size: 2rem;
  color: var(--cyan);
  margin-bottom: 1rem;
}

.info-card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }

.info-card p {
  color: var(--text-muted);
  margin-bottom: 0;
  font-size: 0.93rem;
  line-height: 1.7;
}

.next-banner {
  margin-top: 2.5rem;
  background: linear-gradient(90deg, rgba(16, 186, 213, 0.12), rgba(16, 186, 213, 0.03));
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
}

.next-banner .big {
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  font-weight: 700;
  color: var(--cyan-bright);
}

/* Getting-there directions with photos */

.directions-card {
  margin-top: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  padding: 1.75rem;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

.directions-title {
  font-size: 1.3rem;
  color: var(--cyan-bright);
}

.directions-card .direction img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.9rem;
  border: 1px solid var(--border-soft);
}

.directions-card .direction figcaption {
  margin-top: 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  text-align: center;
}

.directions-card .direction figcaption i {
  color: var(--cyan);
}

/* ===== Events & Recordings ===== */

.events {
  background: linear-gradient(180deg, var(--bg-main) 0%, var(--bg-deep) 100%);
}

.event-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

.event-poster {
  position: relative;
  background: #05080F;
}

.event-poster img {
  display: block;
  width: 100%;
  height: auto;
}

.poster-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: rgba(7, 11, 18, 0.85);
  border: 1px solid var(--border);
  color: var(--cyan-bright);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.event-body { padding: 2rem; }

.event-body h3 {
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  margin-bottom: 0.9rem;
}

.event-facts {
  list-style: none;
  padding: 0;
  margin: 0.25rem 0 1.1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.event-facts li {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  margin-bottom: 0.3rem;
}

.event-facts i { color: var(--cyan); }

.event-body > p { color: var(--text-muted); line-height: 1.7; }

.event-video {
  border-radius: 0.9rem;
  overflow: hidden;
  border: 1px solid var(--border-soft);
  background: #000;
}

.recording-soon {
  display: flex;
  gap: 1rem;
  align-items: center;
  background: rgba(7, 11, 18, 0.5);
  border: 1px dashed var(--border);
  border-radius: 0.9rem;
  padding: 1rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.recording-soon i {
  font-size: 1.5rem;
  color: var(--cyan);
  flex: 0 0 auto;
}

/* ===== Join ===== */

.join {
  background: linear-gradient(180deg, var(--bg-deep) 0%, #0A0F1E 100%);
}

.qr-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
}

.qr-card img {
  max-width: 260px;
  width: 100%;
  border-radius: 0.75rem;
  background: #fff;
  padding: 0.5rem;
}

.qr-card figcaption {
  margin-top: 0.9rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.join-checklist {
  list-style: none;
  padding: 0;
  color: var(--text-muted);
}

.join-checklist li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-bottom: 0.9rem;
}

.join-checklist li:last-child { margin-bottom: 0; }

.join-checklist i {
  color: var(--cyan);
  margin-top: 0.2rem;
}

/* ===== Contact ===== */

.contact {
  background: linear-gradient(180deg, var(--bg-main) 0%, var(--bg-deep) 100%);
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  padding: 2rem;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
}

.contact-card .form-label {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}

.contact-card .form-control {
  background: rgba(7, 11, 18, 0.6);
  border: 1px solid var(--border-soft);
  color: var(--text);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
}

.contact-card .form-control:focus {
  background: rgba(7, 11, 18, 0.8);
  border-color: var(--cyan);
  box-shadow: 0 0 0 0.25rem rgba(16, 186, 213, 0.18);
  color: var(--text);
}

.contact-card .form-control::placeholder {
  color: rgba(154, 166, 194, 0.55);
}

#form-status:not(.d-none) {
  margin-bottom: 1.25rem;
}

/* ===== Footer ===== */

.footer {
  background: #05080F;
  border-top: 1px solid var(--border-soft);
  padding: 3.5rem 0 2rem;
}

.footer h5 {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

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

.footer ul li {
  margin-bottom: 0.6rem;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-soft);
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ===== Responsive tweaks ===== */

@media (max-width: 991.98px) {
  .hero { padding-top: 7rem; }
}

@media (max-width: 575.98px) {
  .section { padding: 4rem 0; }
  .meetup-card { padding: 1.5rem 1.25rem; }
  .contact-card { padding: 1.5rem 1.25rem; }
  .cd-num { font-size: 1.5rem; }
  .event-body { padding: 1.5rem 1.25rem; }
}