/* ============================================
   TulsaCor — MultiGP Drone Racing Chapter
   Landing Page Styles
   ============================================ */

/* ---------- Design Tokens ---------- */
:root {
  --c-bg:        #0a0a0f;
  --c-bg-alt:    #111118;
  --c-surface:   #1a1a24;
  --c-border:    #2a2a3a;
  --c-text:      #e0e0ec;
  --c-text-dim:  #8888a0;
  --c-accent:    #00e5ff;
  --c-accent-2:  #7c4dff;
  --c-glow:      rgba(0, 229, 255, 0.25);
  --c-discord:   #5865F2;

  --font-heading: 'Exo 2', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  6rem;

  --radius:    12px;
  --radius-sm: 8px;
  --max-w:     1120px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #fff; }

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

/* ---------- Utility ---------- */
.container { width: 90%; max-width: var(--max-w); margin: 0 auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn--sm  { font-size: 0.85rem; padding: 0.45rem 1.25rem; }
.btn--lg  { font-size: 1.05rem; padding: 0.85rem 2rem; }

.btn--accent {
  background: var(--c-accent);
  color: #000;
  border-color: var(--c-accent);
  box-shadow: 0 0 20px var(--c-glow);
}
.btn--accent:hover {
  background: #fff;
  border-color: #fff;
  color: #000;
  box-shadow: 0 0 30px rgba(255,255,255,0.2);
}

.btn--outline {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border);
}
.btn--outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.btn__icon { flex-shrink: 0; }

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-sm) 0;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav--scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--c-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 90%;
  max-width: var(--max-w);
  margin: 0 auto;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--c-text);
}

.nav__logo { font-size: 1.5rem; }

.nav__logo-img {
  height: 32px;
  width: auto;
  filter: invert(1);
  transition: filter var(--transition);
}
.nav__brand:hover .nav__logo-img {
  filter: invert(1) drop-shadow(0 0 6px var(--c-glow));
}

.nav__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

.nav__links a:not(.btn) {
  color: var(--c-text-dim);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav__links a:not(.btn):hover { color: var(--c-accent); }

/* Mobile toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(0, 229, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(124, 77, 255, 0.06) 0%, transparent 60%),
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-alt) 100%);
  z-index: 0;
}

/* Animated grid overlay */
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.12;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero__content { position: relative; z-index: 1; max-width: 740px; }

.hero__logo {
  width: 140px;
  height: auto;
  margin: 0 auto var(--space-md);
  filter: invert(1) drop-shadow(0 0 24px var(--c-glow)) drop-shadow(0 0 48px rgba(0, 229, 255, 0.12));
  animation: float 4s ease-in-out infinite;
}

.hero__tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  margin-bottom: var(--space-sm);
  padding: 0.35rem 1rem;
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 50px;
}

.hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.hero__title-line { display: block; }

.hero__title-line--accent {
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__sub {
  font-size: 1.15rem;
  color: var(--c-text-dim);
  max-width: 560px;
  margin: 0 auto var(--space-md);
  line-height: 1.8;
}
.hero__sub strong { color: var(--c-text); }

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--c-text-dim);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--c-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* ---------- Sections ---------- */
.section {
  padding: var(--space-xl) 0;
}

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

.section__header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section__tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  margin-bottom: var(--space-xs);
}

.section__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.02em;
}

/* ---------- About Grid ---------- */
.about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.about__card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  transition: border-color var(--transition), transform var(--transition);
}

.about__card:hover {
  border-color: var(--c-accent);
  transform: translateY(-4px);
}

.about__icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.about__card h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
}

.about__card p {
  color: var(--c-text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
}

.about__encor-logo {
  height: 36px;
  width: auto;
  filter: invert(1);
}`n`n.about__card-btn { margin-top: var(--space-sm); }

/* ---------- Expect Grid ---------- */
.expect__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
}

.expect__item { padding: var(--space-sm) 0; }

.expect__number {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-xs);
  line-height: 1;
}

.expect__item h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: var(--space-xs);
}

.expect__item p {
  color: var(--c-text-dim);
  font-size: 0.95rem;
}

/* ---------- CTA Section ---------- */
.cta {
  background:
    radial-gradient(ellipse at 80% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 60%),
    var(--c-bg);
}

.cta__inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: var(--space-lg);
}

.cta__text .section__tag { margin-bottom: var(--space-xs); }
.cta__text .section__title { text-align: left; margin-bottom: var(--space-sm); }

.cta__text p {
  color: var(--c-text-dim);
  font-size: 1.05rem;
  margin-bottom: var(--space-md);
  max-width: 500px;
}

/* Floating drone animation */
.cta__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.cta__drone {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cta__drone-body {
  font-size: 5rem;
  animation: float 4s ease-in-out infinite;
  position: relative;
  z-index: 1;
}

.cta__drone-logo {
  width: 180px;
  height: auto;
  filter: invert(1) drop-shadow(0 0 20px var(--c-glow));
}

.cta__drone-ring {
  position: absolute;
  width: 160px;
  height: 160px;
  border: 2px solid var(--c-accent);
  border-radius: 50%;
  opacity: 0;
  animation: ping 3s ease-out infinite;
}

.cta__drone-ring--delay { animation-delay: 1.5s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

@keyframes ping {
  0% { transform: scale(0.6); opacity: 0.4; }
  100% { transform: scale(2); opacity: 0; }
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-lg) 0 var(--space-md);
  border-top: 1px solid var(--c-border);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.footer__brand { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }

.footer__logos {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.footer__logo {
  height: auto;
  filter: invert(1);
  opacity: 0.7;
  transition: opacity var(--transition);
}
.footer__logo:hover { opacity: 1; }

.footer__logo--tulsacor { width: 48px; }
.footer__logo--encor { height: 28px; }

.footer__hosted {
  width: 100%;
  font-size: 0.85rem;
  color: var(--c-text-dim);
  margin-top: 0.25rem;
}

.footer__links {
  display: flex;
  gap: var(--space-md);
}
.footer__links a {
  color: var(--c-text-dim);
  font-size: 0.9rem;
}
.footer__links a:hover { color: var(--c-accent); }

.footer__bottom {
  border-top: 1px solid var(--c-border);
  padding-top: var(--space-sm);
}

.footer__bottom p {
  font-size: 0.8rem;
  color: var(--c-text-dim);
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    flex-direction: column;
    background: var(--c-bg-alt);
    padding: 5rem var(--space-md) var(--space-md);
    border-left: 1px solid var(--c-border);
    transition: right var(--transition);
    gap: var(--space-sm);
  }

  .nav__links--open { right: 0; }

  .nav__toggle { display: flex; z-index: 1001; }

  .nav__toggle--active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav__toggle--active span:nth-child(2) { opacity: 0; }
  .nav__toggle--active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .cta__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .cta__text .section__title { text-align: center; }
  .cta__text p { margin-left: auto; margin-right: auto; }

  .hero__scroll { display: none; }
}