/* ================================================================
   JUST KEEP BUILDING SOLUTIONS — styles.css
   Design: near-black/grey bg, blue accents, space-inspired
================================================================ */

/* ----------------------------------------------------------------
   CSS CUSTOM PROPERTIES
---------------------------------------------------------------- */
:root {
  --bg-primary:    #0a0d14;
  --bg-secondary:  #0f1420;
  --bg-card:       #111827;
  --bg-card-hover: #162035;

  --blue:          #1e90ff;
  --blue-dim:      rgba(30, 144, 255, 0.15);
  --blue-glow:     rgba(30, 144, 255, 0.35);

  --text-primary:  #e8eaf0;
  --text-secondary:#8b9ab5;
  --text-muted:    #4a5568;

  --border:        rgba(30, 144, 255, 0.18);
  --border-hover:  rgba(30, 144, 255, 0.5);

  --radius-sm:     6px;
  --radius-md:     10px;
  --radius-lg:     16px;

  --shadow-card:   0 4px 24px rgba(0, 0, 0, 0.45);
  --shadow-glow:   0 0 20px rgba(30, 144, 255, 0.2);

  --header-h:      68px;
  --max-w:         1100px;

  --font-sans:     'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono:     'Courier New', monospace;

  --transition:    0.25s ease;
}

/* ----------------------------------------------------------------
   RESET & BASE
---------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--blue);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: #5aadff;
}

ul {
  list-style: none;
}

/* Focus ring — accessible and styled */
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ----------------------------------------------------------------
   UTILITY — SKIP LINK
---------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 1rem;
  background: var(--blue);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
}
.skip-link:focus {
  top: 1rem;
}

/* ----------------------------------------------------------------
   HEADER / NAV
---------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(10, 13, 20, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.6);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: 40px;
  width: auto;
  border-radius: 0;
  object-fit: contain;
  transition: transform var(--transition), filter var(--transition);
}

.logo-img:hover {
  transform: scale(1.03);
  filter: drop-shadow(0 0 8px var(--blue-glow));
}

.main-nav ul {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.main-nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--text-primary);
  background: var(--blue-dim);
}

.main-nav a.active {
  color: var(--blue);
}

/* Hamburger toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 6px;
  transition: border-color var(--transition);
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ----------------------------------------------------------------
   HERO
---------------------------------------------------------------- */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 2rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: calc(var(--header-h) + 4rem) 1.5rem 4rem;
}

.hero-content {
  z-index: 1;
}

.hero-content h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero-content h1 em {
  font-style: normal;
  color: var(--blue);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 46ch;
  margin-bottom: 2rem;
  line-height: 1.7;
}

/* ----------------------------------------------------------------
   BUTTONS
---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              box-shadow var(--transition), transform var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 0 0 0 var(--blue-glow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #3da1ff;
  color: #fff;
  box-shadow: 0 0 18px var(--blue-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--blue);
  border: 1px solid var(--border-hover);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--blue-dim);
  color: #5aadff;
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
}

/* ----------------------------------------------------------------
   HERO VISUAL — ABSTRACT SPACE GRAPHIC
---------------------------------------------------------------- */
.hero-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 460px;
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.star-field {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.star {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  animation: twinkle var(--dur, 3s) ease-in-out infinite var(--delay, 0s);
}

@keyframes twinkle {
  0%, 100% { opacity: var(--min-op, 0.15); transform: scale(1); }
  50%       { opacity: var(--max-op, 0.9); transform: scale(1.3); }
}

.orbit-ring {
  position: absolute;
  border: 1px solid rgba(30, 144, 255, 0.25);
  border-radius: 50%;
  animation: orbit-spin linear infinite;
}

.ring-1 {
  width: 65%;
  height: 65%;
  animation-duration: 18s;
  border-color: rgba(30, 144, 255, 0.35);
  border-style: dashed;
}

.ring-2 {
  width: 82%;
  height: 82%;
  animation-duration: 30s;
  animation-direction: reverse;
}

.ring-3 {
  width: 96%;
  height: 96%;
  animation-duration: 48s;
  border-color: rgba(30, 144, 255, 0.12);
}

@keyframes orbit-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.orbit-dot {
  position: absolute;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 8px var(--blue);
}

.dot-1 {
  width: 10px;
  height: 10px;
  top: 18%;
  left: 50%;
  animation: orbit-dot-1 18s linear infinite;
}

.dot-2 {
  width: 6px;
  height: 6px;
  top: 50%;
  left: 9%;
  background: #7bc8ff;
  box-shadow: 0 0 6px #7bc8ff;
  animation: orbit-dot-2 30s linear infinite reverse;
}

@keyframes orbit-dot-1 {
  from { transform: rotate(0deg)   translateX(calc(32.5% + 5px)); }
  to   { transform: rotate(360deg) translateX(calc(32.5% + 5px)); }
}

@keyframes orbit-dot-2 {
  from { transform: rotate(0deg)   translateX(calc(41% + 3px)); }
  to   { transform: rotate(360deg) translateX(calc(41% + 3px)); }
}

.glow-core {
  position: absolute;
  width: 22%;
  height: 22%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(30,144,255,0.9) 0%, rgba(30,144,255,0) 70%);
  animation: pulse-core 4s ease-in-out infinite;
}

@keyframes pulse-core {
  0%, 100% { transform: scale(1);    opacity: 0.8; }
  50%       { transform: scale(1.25); opacity: 1;   }
}

/* ----------------------------------------------------------------
   SECTIONS — SHARED
---------------------------------------------------------------- */
.section {
  padding: 5rem 1.5rem;
  background: var(--bg-primary);
}

.section-alt {
  background: var(--bg-secondary);
}

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
  margin-top: 0.5rem;
  border-radius: 2px;
}

.section-sub {
  margin-top: 0.6rem;
  font-size: 1rem;
  font-style: italic;
  color: var(--text-secondary);
}

/* ----------------------------------------------------------------
   CARDS — BASE
---------------------------------------------------------------- */
.card-grid {
  display: grid;
  gap: 1.25rem;
}

.four-col  { grid-template-columns: repeat(4, 1fr); }
.three-col { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color var(--transition), box-shadow var(--transition),
              transform var(--transition), background var(--transition);
}

.card:hover,
.card:focus-within {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.card h3 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.6rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.card-icon {
  width: 40px;
  height: 40px;
  color: var(--blue);
  margin-bottom: 1rem;
  opacity: 0.85;
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

/* ----------------------------------------------------------------
   MEDIA CARDS (LEARN SECTION)
---------------------------------------------------------------- */
.card-media {
  padding: 0;
  overflow: hidden;
}

.card-media-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
  text-decoration: none;
}

.card-media-link:hover,
.card-media-link:focus-visible {
  color: inherit;
}

.card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-primary);
  flex-shrink: 0;
}

.thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0d1526 0%, #0f2040 100%);
  transition: background var(--transition);
}

.card-media-link:hover .thumb-placeholder {
  background: linear-gradient(135deg, #0f1a30 0%, #142a55 100%);
}

.thumb-placeholder svg {
  width: 70%;
  height: auto;
}

.card-media-body {
  padding: 1.25rem 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}

.card-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  opacity: 0.75;
}

.card-media-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: none;
  letter-spacing: 0;
  margin-bottom: 0.25rem;
}

.card-media-body p {
  flex: 1;
}

.card-link-text {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.04em;
  margin-top: 0.5rem;
  transition: color var(--transition);
}

.card-media-link:hover .card-link-text {
  color: #5aadff;
}

/* ----------------------------------------------------------------
   USER GROUP SECTION
---------------------------------------------------------------- */
.ug-grid {
  align-items: stretch;
}

.ug-logo-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.ug-logo-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.ug-logo-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.ug-logo-icon svg {
  width: 80px;
  height: 80px;
  animation: pulse-core 5s ease-in-out infinite;
}

.ug-logo-text {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.5;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ug-logo-text strong {
  color: var(--blue);
  font-weight: 700;
}

.ug-grid .card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ----------------------------------------------------------------
   ABOUT / MISSION + CONTACT FORM
---------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-mission h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  position: relative;
  display: inline-block;
}

.about-mission h2::after {
  content: '';
  display: block;
  height: 2px;
  width: 60px;
  background: var(--blue);
  margin-top: 0.5rem;
  border-radius: 2px;
}

.about-mission p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 1rem;
}

.about-contact h3 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.about-contact > p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* ----------------------------------------------------------------
   CONTACT FORM
---------------------------------------------------------------- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.65rem 0.9rem;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30, 144, 255, 0.15);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #e05252;
}

.form-notice {
  font-size: 0.85rem;
  min-height: 1.2em;
  margin-top: 0.25rem;
}

.form-notice.success { color: #4caf8d; }
.form-notice.error   { color: #e05252; }

/* ----------------------------------------------------------------
   FOOTER
---------------------------------------------------------------- */
.site-footer {
  background: #07090f;
  border-top: 1px solid var(--border);
  padding: 3.5rem 1.5rem 0;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.footer-logo-img {
  height: 56px;
  width: 56px;
  border-radius: 8px;
  object-fit: cover;
  opacity: 0.9;
  transition: opacity var(--transition);
}

.footer-logo-img:hover {
  opacity: 1;
}

.footer-nav h4,
.footer-social h4 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 1rem;
}

.footer-nav ul,
.footer-social ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-nav a,
.footer-social a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-nav a:hover,
.footer-social a:hover {
  color: var(--text-primary);
}

.footer-social svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.25rem 0 1.5rem;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* ----------------------------------------------------------------
   SCROLL REVEAL ANIMATION
---------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.card-grid .card:nth-child(1) { transition-delay: 0.05s; }
.card-grid .card:nth-child(2) { transition-delay: 0.12s; }
.card-grid .card:nth-child(3) { transition-delay: 0.19s; }
.card-grid .card:nth-child(4) { transition-delay: 0.26s; }
.card-grid .ug-logo-card      { transition-delay: 0.05s; }

/* ----------------------------------------------------------------
   RESPONSIVE
---------------------------------------------------------------- */

/* Tablet — 900px */
@media (max-width: 900px) {
  .four-col  { grid-template-columns: repeat(2, 1fr); }

  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: calc(var(--header-h) + 3rem);
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-visual {
    max-width: 340px;
    margin: 0 auto;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

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

  .footer-logo {
    grid-column: 1 / -1;
  }
}

/* Mobile — 640px */
@media (max-width: 640px) {
  :root { --header-h: 60px; }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(10, 13, 20, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem 1.5rem;
    transform: translateY(-110%);
    transition: transform 0.3s ease;
    z-index: 999;
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0.2rem;
    align-items: flex-start;
  }

  .main-nav a {
    font-size: 1rem;
    padding: 0.6rem 0.75rem;
    width: 100%;
  }

  .four-col  { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: 1fr; }

  .hero {
    padding-top: calc(var(--header-h) + 2rem);
    padding-bottom: 3rem;
  }

  .hero-content h1 {
    font-size: clamp(2rem, 8vw, 2.8rem);
  }

  .hero-visual {
    max-width: 280px;
  }

  .section { padding: 3.5rem 1.25rem; }

  .about-grid { gap: 2.5rem; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-logo {
    grid-column: auto;
  }
}

/* Tiny mobile — 380px */
@media (max-width: 380px) {
  .hero-content h1 {
    font-size: 1.85rem;
  }
}