/* ============================================================
   DOOM 67 — Landing Page Stylesheet
   Retro DOOM aesthetic · Albertus Nova typography
   ============================================================ */

/* --- Self-hosted Albertus Nova --- */
@font-face {
  font-family: 'Albertus Nova';
  src: url('fonts/albertusnova.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Albertus Nova';
  src: url('fonts/albertusnova_bold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* --- Self-hosted game font --- */
@font-face {
  font-family: 'AmazDooM';
  src: url('fonts/amazdoom.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* --- CSS Custom Properties --- */
:root {
  --color-blood:        #8B0000;
  --color-blood-bright: #CC1100;
  --color-lava:         #D4440F;
  --color-fire:         #C45A1A;
  --color-ember:        #D4913A;
  --color-bone:         #C4B590;
  --color-pale:         #DDD0B8;
  --color-ash:          #1A1110;
  --color-charcoal:     #2A1F1E;
  --color-smoke:        #3A2A28;
  --color-dark:         #0D0907;
  --color-gold:         #A8893E;
  --color-gold-dim:     #7A6530;

  --font-primary: 'Albertus Nova', 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
  --font-doom: 'AmazDooM', 'Albertus Nova', serif;

  --border-subtle: 1px solid rgba(139, 0, 0, 0.5);
  --border-strong: 2px solid var(--color-blood);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--color-blood) var(--color-ash);
}

html::-webkit-scrollbar {
  width: 8px;
}
html::-webkit-scrollbar-track {
  background: var(--color-ash);
}
html::-webkit-scrollbar-thumb {
  background: var(--color-blood);
  border-radius: 0;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-dark);
  color: var(--color-bone);
  line-height: 1.6;
  overflow-x: hidden;
  cursor: crosshair;
}

::selection {
  background: var(--color-blood);
  color: var(--color-pale);
}

a {
  color: var(--color-fire);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--color-ember);
}

/* --- Scanline Overlay --- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.04) 2px,
    rgba(0, 0, 0, 0.04) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(13, 9, 7, 0.95);
  border-bottom: 1px solid rgba(139, 0, 0, 0.4);
  padding: 0.8rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-family: var(--font-doom);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-fire);
  text-transform: uppercase;
  letter-spacing: 4px;
}

.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav__link {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-bone);
  position: relative;
  padding-bottom: 4px;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-blood);
  transition: width 0.3s ease;
}
.nav__link:hover {
  color: var(--color-fire);
}
.nav__link:hover::after {
  width: 100%;
}

/* --- Mobile Nav Toggle --- */
.nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-blood);
  color: var(--color-fire);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
  font-family: var(--font-primary);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: url('img/background.png') center/cover no-repeat;
  filter: brightness(0.3) saturate(1.2);
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at center bottom,
    rgba(139, 0, 0, 0.15) 0%,
    rgba(13, 9, 7, 0.85) 70%
  );
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding: 2rem;
}

.hero__logo {
  width: min(500px, 75vw);
  margin-bottom: 0;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.6));
}

.hero__number {
  font-family: var(--font-doom);
  font-size: clamp(3rem, 8vw, 5.5rem);
  color: var(--color-blood-bright);
  letter-spacing: 12px;
  margin-bottom: 1rem;
  line-height: 1;
}

.hero__subtitle {
  font-size: clamp(0.8rem, 1.8vw, 1rem);
  color: var(--color-bone);
  letter-spacing: 6px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  opacity: 0.7;
}

.hero__tagline {
  font-family: var(--font-doom);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-pale);
  margin-bottom: 2.5rem;
  max-width: 700px;
  line-height: 1.3;
}

.hero__tagline em {
  color: var(--color-fire);
  font-style: normal;
}

.hero__cta {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--color-pale);
  background: var(--color-blood);
  border: 2px solid var(--color-blood-bright);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
}

.hero__cta:hover {
  background: var(--color-blood-bright);
  border-color: var(--color-lava);
  color: var(--color-pale);
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  z-index: 2;
  animation: scrollBounce 2s ease-in-out infinite;
  color: var(--color-bone);
  opacity: 0.4;
  font-size: 1.5rem;
}
@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 0.4; }
  50% { transform: translateY(8px); opacity: 0.7; }
}

/* --- Section Shared --- */
.section {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

.section__title {
  font-family: var(--font-doom);
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--color-fire);
  text-align: center;
  margin-bottom: 1rem;
}

.section__divider {
  width: 80px;
  height: 2px;
  background: var(--color-blood);
  margin: 0 auto 3rem;
  border: none;
}

/* --- About / Story Section --- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about__text p {
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-bone);
}

.about__text p:first-child::first-letter {
  font-size: 3rem;
  color: var(--color-fire);
  float: left;
  line-height: 1;
  margin-right: 0.3rem;
}

.about__image {
  position: relative;
  border: var(--border-strong);
  overflow: hidden;
}

.about__image img {
  width: 100%;
  display: block;
}

/* --- Features Section --- */
.features {
  background: linear-gradient(180deg, var(--color-dark) 0%, var(--color-ash) 50%, var(--color-dark) 100%);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: rgba(26, 17, 16, 0.6);
  border: 1px solid rgba(139, 0, 0, 0.25);
  padding: 2rem;
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(139, 0, 0, 0.6);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  display: block;
  object-fit: contain;
  image-rendering: pixelated;
}

.feature-card__title {
  font-family: var(--font-doom);
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-fire);
  margin-bottom: 0.6rem;
}

.feature-card__desc {
  font-size: 0.95rem;
  color: var(--color-bone);
  opacity: 0.8;
  line-height: 1.7;
}

/* --- Arsenal Section --- */
.arsenal__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.arsenal__item {
  background: rgba(26, 17, 16, 0.5);
  border: 1px solid rgba(139, 0, 0, 0.2);
  padding: 1.5rem 1rem;
}

.arsenal__sprite {
  height: 60px;
  margin-bottom: 0.8rem;
  image-rendering: pixelated;
  filter: brightness(1.1);
}

.arsenal__name {
  font-family: var(--font-doom);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-fire);
  margin-bottom: 0.3rem;
}

.arsenal__desc {
  font-size: 0.8rem;
  color: var(--color-bone);
  opacity: 0.6;
}

/* --- Screenshots Section --- */
.screenshots__gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.screenshot {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--color-blood);
  cursor: pointer;
  aspect-ratio: 16/10;
}

.screenshot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.screenshot:hover img {
  transform: scale(1.04);
}

.screenshot::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(13, 9, 7, 0.6) 100%);
  pointer-events: none;
}

.screenshot__label {
  position: absolute;
  bottom: 0.8rem;
  left: 0.8rem;
  z-index: 2;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-bone);
  opacity: 0.7;
}

/* --- Stats Bar --- */
.stats {
  background: var(--color-ash);
  border-top: 1px solid rgba(139, 0, 0, 0.3);
  border-bottom: 1px solid rgba(139, 0, 0, 0.3);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  text-align: center;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.stat__value {
  font-family: var(--font-doom);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--color-fire);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-bone);
  opacity: 0.5;
}

/* --- System Requirements --- */
.requirements__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.requirements__table th,
.requirements__table td {
  padding: 0.9rem 1.2rem;
  text-align: left;
  border-bottom: 1px solid rgba(139, 0, 0, 0.2);
}

.requirements__table th {
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-fire);
  font-size: 0.8rem;
  font-weight: 700;
}

.requirements__table tr:hover {
  background: rgba(139, 0, 0, 0.06);
}

.requirements__table td:first-child {
  color: var(--color-gold);
  font-weight: 700;
  white-space: nowrap;
}

/* --- Controls Section --- */
.controls__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.controls__group {
  background: rgba(26, 17, 16, 0.5);
  border: 1px solid rgba(139, 0, 0, 0.2);
  padding: 2rem;
}

.controls__group-title {
  font-family: var(--font-doom);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-ember);
  margin-bottom: 1.2rem;
  text-align: center;
}

.controls__list {
  list-style: none;
}

.controls__list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(139, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.controls__list li:last-child {
  border-bottom: none;
}

.controls__key {
  display: inline-block;
  background: var(--color-charcoal);
  border: 1px solid rgba(139, 0, 0, 0.4);
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
  font-family: var(--font-primary);
  color: var(--color-fire);
  letter-spacing: 1px;
  min-width: 60px;
  text-align: center;
}

.controls__action {
  color: var(--color-bone);
  font-size: 0.9rem;
}

/* --- Download Section --- */
.download {
  text-align: center;
  background: var(--color-ash);
  padding: 5rem 2rem;
}

.download__box {
  max-width: 550px;
  margin: 0 auto;
  padding: 2.5rem;
  border: 2px solid var(--color-blood);
  background: rgba(26, 17, 16, 0.5);
}

.download__version {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-gold-dim);
  margin-bottom: 0.5rem;
}

.download__size {
  font-size: 0.85rem;
  color: var(--color-bone);
  opacity: 0.5;
  margin-top: 1rem;
}

.download__platforms {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.download__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  font-family: var(--font-primary);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-pale);
  background: var(--color-blood);
  border: 2px solid var(--color-blood-bright);
  cursor: pointer;
  transition: background 0.2s ease;
  text-decoration: none;
}

.download__btn:hover {
  background: var(--color-blood-bright);
  color: var(--color-pale);
}

.download__btn--secondary {
  background: transparent;
  color: var(--color-bone);
  border: 1px solid rgba(139, 0, 0, 0.5);
}
.download__btn--secondary:hover {
  background: rgba(139, 0, 0, 0.15);
  color: var(--color-pale);
}

/* --- Footer --- */
.footer {
  background: var(--color-dark);
  border-top: 1px solid rgba(139, 0, 0, 0.3);
  padding: 2rem;
  text-align: center;
}

.footer__text {
  font-size: 0.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-bone);
  opacity: 0.35;
}

.footer__credits {
  margin-top: 0.5rem;
  font-size: 0.7rem;
  color: var(--color-bone);
  opacity: 0.2;
  letter-spacing: 1px;
}

/* --- Pentagram Divider --- */
.pentagram-divider {
  text-align: center;
  padding: 1.5rem 0;
  font-size: 1.2rem;
  color: var(--color-blood);
  opacity: 0.3;
  letter-spacing: 12px;
}

/* --- Fade-in Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Ambient Fire Particles --- */
.particles-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--color-fire);
  border-radius: 50%;
  opacity: 0;
  animation: particleRise linear infinite;
}

@keyframes particleRise {
  0% {
    opacity: 0;
    transform: translateY(0) scale(1);
  }
  10% {
    opacity: 0.4;
  }
  90% {
    opacity: 0.1;
  }
  100% {
    opacity: 0;
    transform: translateY(-100vh) scale(0.3);
  }
}

/* --- Lightbox --- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0, 0, 0, 0.92);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.lightbox.active {
  display: flex;
}
.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border: 2px solid var(--color-blood);
}
.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 2rem;
  color: var(--color-fire);
  cursor: pointer;
  font-family: var(--font-primary);
  background: none;
  border: none;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(13, 9, 7, 0.98);
    flex-direction: column;
    padding: 1rem 2rem;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-blood);
  }
  .nav__links.open {
    display: flex;
  }
  .nav__toggle {
    display: block;
  }

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

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

  .hero__cta {
    padding: 0.8rem 1.8rem;
    font-size: 0.9rem;
  }

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

  .download__platforms {
    flex-direction: column;
    align-items: center;
  }

  .arsenal__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}