:root {
  --red: #E01010;
  --red-dark: #9B0000;
  --red-glow: #FF2020;
  --black: #080808;
  --black2: #111111;
  --black3: #1a1a1a;
  --white: #F5F5F5;
  --gray: #888;
  --gray2: #333;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--white);
  font-family: 'Rajdhani', sans-serif;
  overflow-x: hidden;
}

/* ── PARTICLES CANVAS ── */
#particleCanvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(8,8,8,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--red-dark);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 56px;
}

.nav-brand {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.4rem;
  letter-spacing: 3px;
  color: var(--red);
  flex-shrink: 0;
}

.nav-slides {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
  flex: 1;
}

.nav-dot {
  width: 26px; height: 26px;
  border-radius: 4px;
  border: 1px solid var(--gray2);
  background: transparent;
  color: var(--gray);
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex; align-items: center; justify-content: center;
}
.nav-dot:hover, .nav-dot.active {
  border-color: var(--red);
  background: var(--red);
  color: white;
}

/* ── SLIDES ── */
.slide {
  min-height: 100vh;
  padding: 80px 0 40px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.slide::before {
  content: attr(data-num);
  position: absolute;
  right: -0.05em;
  bottom: -0.1em;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 28vw;
  color: rgba(224,16,16,0.04);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.slide-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 3rem;
  position: relative;
  z-index: 2;
}

.slide:nth-child(odd) { background: var(--black); }
.slide:nth-child(even) { background: var(--black2); }

.slide-accent {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 1.2rem;
}
.slide-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--red);
  border: 1px solid var(--red-dark);
  padding: 3px 8px;
  border-radius: 3px;
}
.slide-line {
  flex: 1;
  max-width: 60px;
  height: 1px;
  background: var(--red-dark);
}
.slide-tag {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  color: var(--gray);
  letter-spacing: 2px;
  text-transform: uppercase;
}

h1, h2 {
  font-family: 'Bebas Neue', sans-serif;
  letter-spacing: 2px;
}

/* ── SLIDE 1: TITLE ── */
.slide-title {
  background: var(--black) !important;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.slide-title::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(224,16,16,0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(155,0,0,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.title-eyebrow {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 5px;
  color: var(--red);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}
.title-main {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(4rem, 12vw, 9rem);
  line-height: 0.9;
  letter-spacing: 4px;
  margin-bottom: 1.5rem;
}
.title-main span { color: var(--red); }

/* Typewriter */
.typewriter {
  display: inline;
  border-right: 3px solid var(--red);
  animation: blink 0.7s step-end infinite;
  white-space: pre-wrap;
  word-break: break-word;
}
@keyframes blink {
  50% { border-color: transparent; }
}

/* Glitch */
.glitch {
  position: relative;
}
.glitch::before, .glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  letter-spacing: inherit;
}
.glitch::before {
  color: #ff0040;
  animation: glitch1 3s infinite;
  clip-path: polygon(0 20%, 100% 20%, 100% 40%, 0 40%);
}
.glitch::after {
  color: #00ffff;
  animation: glitch2 3s infinite;
  clip-path: polygon(0 60%, 100% 60%, 100% 80%, 0 80%);
}
@keyframes glitch1 {
  0%, 90%, 100% { transform: translate(0); opacity: 0; }
  92% { transform: translate(-4px, 1px); opacity: 0.7; }
  94% { transform: translate(4px, -1px); opacity: 0.7; }
  96% { transform: translate(-2px); opacity: 0.7; }
}
@keyframes glitch2 {
  0%, 90%, 100% { transform: translate(0); opacity: 0; }
  93% { transform: translate(4px, 2px); opacity: 0.7; }
  95% { transform: translate(-4px, -1px); opacity: 0.7; }
  97% { transform: translate(2px); opacity: 0.7; }
}

.title-sub {
  font-size: 1.1rem;
  color: var(--gray);
  font-weight: 400;
  max-width: 520px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}
.title-badge {
  display: inline-block;
  border: 1px solid var(--red-dark);
  padding: 10px 24px;
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: var(--red);
  background: rgba(224,16,16,0.06);
}
.title-divider {
  width: 80px; height: 2px;
  background: linear-gradient(90deg, var(--red), transparent);
  margin: 2rem auto;
}

/* ── CONTENT SLIDES ── */
.slide h2 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
  margin-bottom: 2rem;
}
.slide h2 .red { color: var(--red); }

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.content-grid.three { grid-template-columns: repeat(3, 1fr); }
.content-grid.single { grid-template-columns: 1fr; max-width: 700px; }

/* ── CARDS with glow + stagger ── */
.card {
  background: var(--black3);
  border: 1px solid var(--gray2);
  border-top: 2px solid var(--red-dark);
  padding: 1.4rem 1.6rem;
  position: relative;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  opacity: 0;
  transform: translateY(24px);
}
.card.visible {
  animation: cardIn 0.5s ease forwards;
}
.card:hover {
  border-top-color: var(--red);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(224,16,16,0.15), 0 0 40px rgba(224,16,16,0.06);
}
@keyframes cardIn {
  to { opacity: 1; transform: translateY(0); }
}

.card-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.2rem;
  letter-spacing: 2px;
  color: var(--red);
  margin-bottom: 0.8rem;
}
.card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.card ul li {
  font-size: 0.95rem;
  color: #ccc;
  padding-left: 1.2rem;
  position: relative;
  line-height: 1.5;
}
.card ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--red);
  font-size: 0.75rem;
  top: 3px;
}
.card p {
  font-size: 0.95rem;
  color: #ccc;
  line-height: 1.65;
}
.card.highlight {
  border-color: var(--red-dark);
  border-top-color: var(--red);
  background: rgba(224,16,16,0.05);
}

/* ── SCROLL REVEAL (headings, obj-items) ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* step list */
.steps { display: flex; flex-direction: column; gap: 0.8rem; }
.step { display: flex; align-items: flex-start; gap: 1rem; }
.step-num {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.8rem;
  color: var(--red);
  line-height: 1;
  min-width: 36px;
}
.step-text { font-size: 0.95rem; color: #ccc; line-height: 1.5; padding-top: 4px; }

/* big quote */
.quote-block {
  border-left: 4px solid var(--red);
  padding: 1.5rem 2rem;
  background: rgba(224,16,16,0.05);
  font-size: 1.4rem;
  font-style: italic;
  color: var(--white);
  line-height: 1.5;
  margin: 2rem 0;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
}

/* objectives list */
.obj-list { display: flex; flex-direction: column; gap: 0.9rem; }
.obj-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--gray2);
  background: var(--black3);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.obj-item:hover {
  border-color: var(--red-dark);
  box-shadow: 0 0 12px rgba(224,16,16,0.1);
}
.obj-icon { font-size: 1.2rem; min-width: 24px; margin-top: 1px; }
.obj-text { font-size: 1rem; color: #ccc; line-height: 1.5; }

/* tag badges */
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.2rem; }
.tag {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  padding: 4px 10px;
  border: 1px solid var(--red-dark);
  color: var(--red);
  letter-spacing: 1px;
}

/* divider */
.slide-divider {
  width: 100%; height: 1px;
  background: linear-gradient(90deg, var(--red), transparent);
  margin: 1.5rem 0;
}

/* closing slide */
.slide-closing {
  text-align: center;
  background: var(--black) !important;
}
.slide-closing::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(224,16,16,0.1) 0%, transparent 70%);
  pointer-events: none;
}
.close-icon { font-size: 3rem; margin-bottom: 1rem; }

/* ── COUNTER ── */
.counter-val {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 2.5rem;
  color: var(--red);
  display: block;
  line-height: 1;
}

/* ── ADVANCED NAV BUTTONS ── */
.slide-nav-btn {
  position: fixed;
  bottom: 2rem;
  z-index: 100;
  width: 64px; height: 64px;
  border-radius: 0;
  border: none;
  background: transparent;
  color: var(--red);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.2s ease;
  overflow: visible;
  padding: 0;
}
#prevBtn { left: 1.5rem; }
#nextBtn { right: 1.5rem; }

.btn-svg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  overflow: visible;
}

/* Corner bracket ticks */
.btn-corner {
  fill: none;
  stroke: var(--red);
  stroke-width: 1.5;
  stroke-linecap: square;
  opacity: 0.5;
  transition: opacity 0.3s, stroke-width 0.3s;
  filter: drop-shadow(0 0 3px rgba(224,16,16,0.6));
}
@keyframes cornerPulse {
  0%, 100% { opacity: 0.35; filter: drop-shadow(0 0 2px rgba(224,16,16,0.4)); }
  50%       { opacity: 0.75; filter: drop-shadow(0 0 6px rgba(224,16,16,0.9)); }
}
.btn-corner { animation: cornerPulse 2.5s ease-in-out infinite; }

/* Arrow shaft & head — red, glow only on these */
.btn-arrow-shaft {
  fill: none;
  stroke: var(--red);
  stroke-width: 2;
  stroke-linecap: square;
  filter: drop-shadow(0 0 4px rgba(224,16,16,0.8));
}
.btn-arrow-head {
  fill: none;
  stroke: var(--red);
  stroke-width: 2;
  stroke-linecap: square;
  stroke-linejoin: miter;
  filter: drop-shadow(0 0 4px rgba(224,16,16,0.8));
}

/* Trail ghost arrows — red tinted, no glow */
.btn-trail {
  fill: none;
  stroke: var(--red);
  stroke-width: 1.2;
  stroke-linecap: square;
  stroke-linejoin: miter;
  opacity: 0;
  transition: opacity 0.2s;
}

/* ── HOVER ── */
.slide-nav-btn:hover { transform: scale(1.08); }

.slide-nav-btn:hover .btn-corner {
  opacity: 1;
  stroke-width: 2;
  animation: none;
  filter: drop-shadow(0 0 8px rgba(224,16,16,1)) drop-shadow(0 0 16px rgba(224,16,16,0.5));
}

.slide-nav-btn:hover .btn-arrow-shaft,
.slide-nav-btn:hover .btn-arrow-head {
  filter: drop-shadow(0 0 8px rgba(224,16,16,1)) drop-shadow(0 0 20px rgba(224,16,16,0.6));
}

.slide-nav-btn:hover .btn-trail { opacity: 1; }

.slide-nav-btn:hover .btn-arrow-group {
  animation: arrowBounce 0.45s ease infinite alternate;
}
#prevBtn:hover .btn-arrow-group { animation-name: arrowBounceLeft; }
#nextBtn:hover .btn-arrow-group { animation-name: arrowBounceRight; }

@keyframes arrowBounceRight {
  from { transform: translateX(0); }
  to   { transform: translateX(5px); }
}
@keyframes arrowBounceLeft {
  from { transform: translateX(0); }
  to   { transform: translateX(-5px); }
}

/* ── CLICK ── */
.slide-nav-btn:active { transform: scale(0.9); }

/* scroll progress */
.progress-bar {
  position: fixed;
  top: 56px; left: 0;
  height: 2px;
  background: var(--red);
  z-index: 99;
  transition: width 0.1s;
}

/* ── FULLSCREEN BUTTON ── */
.fullscreen-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--gray2);
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.2s, background 0.2s, transform 0.15s, box-shadow 0.2s;
  padding: 0;
}
.fullscreen-btn:hover {
  border-color: var(--red);
  background: rgba(224,16,16,0.08);
  box-shadow: 0 0 10px rgba(224,16,16,0.3);
  transform: scale(1.08);
}
.fullscreen-btn:active { transform: scale(0.92); }
.fs-icon {
  width: 18px;
  height: 18px;
  stroke: var(--red);
  stroke-width: 2;
  stroke-linecap: square;
  stroke-linejoin: miter;
  filter: drop-shadow(0 0 3px rgba(224,16,16,0.6));
  transition: filter 0.2s;
}
.fullscreen-btn:hover .fs-icon {
  filter: drop-shadow(0 0 6px rgba(224,16,16,1)) drop-shadow(0 0 14px rgba(224,16,16,0.5));
}

/* Fullscreen toast notification */
.fs-toast {
  position: fixed;
  bottom: 6rem;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: rgba(8,8,8,0.92);
  border: 1px solid var(--red-dark);
  color: var(--gray);
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 18px;
  pointer-events: none;
  z-index: 9997;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
}
.fs-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* responsive */

@media (max-width: 768px) {
  .content-grid, .content-grid.three { grid-template-columns: 1fr; }
  .slide-inner { padding: 0 1.4rem; }
  .nav-slides { display: none; }
  .title-main { font-size: clamp(3rem, 16vw, 5rem); }
}

/* ── MOVING GRADIENT BACKGROUND ── */
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.slide:nth-child(odd) {
  background: linear-gradient(135deg, #080808, #0f0505, #080808, #100808) !important;
  background-size: 400% 400% !important;
  animation: gradientShift 12s ease infinite;
}
.slide:nth-child(even) {
  background: linear-gradient(135deg, #111111, #160808, #111111, #120909) !important;
  background-size: 400% 400% !important;
  animation: gradientShift 15s ease infinite reverse;
}
.slide-title, .slide-closing {
  background: linear-gradient(135deg, #080808, #120303, #080808, #0d0505) !important;
  background-size: 400% 400% !important;
  animation: gradientShift 10s ease infinite !important;
}

/* ── SCANLINES ── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0,0,0,0.08) 3px,
    rgba(0,0,0,0.08) 4px
  );
}

/* ── NEON PULSE — only red parts glow ── */
@keyframes neonPulse {
  0%, 100% {
    text-shadow: 0 0 4px rgba(224,16,16,0.4), 0 0 12px rgba(224,16,16,0.15);
  }
  50% {
    text-shadow: 0 0 8px rgba(224,16,16,0.9), 0 0 22px rgba(224,16,16,0.4), 0 0 44px rgba(224,16,16,0.15);
  }
}
/* h2 white part — no glow, no text-shadow */
.slide h2 {
  animation: none;
  text-shadow: none;
}
/* only the .red span inside h2 glows */
.slide h2 .red {
  animation: neonPulse 2s ease-in-out infinite;
}
.nav-brand {
  animation: neonPulse 2.5s ease-in-out infinite, flicker 8s infinite;
}

/* ── SLIDE LINE DRAW ANIMATION ── */
.slide-line {
  width: 0 !important;
  transition: width 0.8s ease 0.2s !important;
}
.slide-line.line-drawn {
  width: 60px !important;
}

/* ── CARD GLOW enhanced ── */
.card:hover {
  box-shadow:
    0 0 15px rgba(224,16,16,0.2),
    0 0 30px rgba(224,16,16,0.08),
    inset 0 0 20px rgba(224,16,16,0.03) !important;
}

/* ── PROGRESS BAR GLOW ── */
.progress-bar {
  box-shadow: 0 0 8px rgba(224,16,16,0.6), 0 0 16px rgba(224,16,16,0.3);
}

/* ── NAV BRAND FLICKER ── */
@keyframes flicker {
  0%, 95%, 100% { opacity: 1; }
  96% { opacity: 0.7; }
  97% { opacity: 1; }
  98% { opacity: 0.5; }
  99% { opacity: 1; }
}

/* ── TITLE BADGE PULSE ── */
@keyframes badgePulse {
  0%, 100% { border-color: var(--red-dark); box-shadow: none; }
  50% { border-color: var(--red); box-shadow: 0 0 12px rgba(224,16,16,0.3); }
}
.title-badge {
  animation: badgePulse 2.5s ease-in-out infinite;
}

/* ── TAG HOVER GLOW ── */
.tag {
  transition: all 0.2s;
}
.tag:hover {
  background: rgba(224,16,16,0.1);
  box-shadow: 0 0 8px rgba(224,16,16,0.3);
  color: #ff4444;
}

/* ── STEP NUM PULSE ── */
@keyframes stepPulse {
  0%, 100% { color: var(--red); }
  50% { color: var(--red-glow); text-shadow: 0 0 10px rgba(255,32,32,0.5); }
}
.step-num {
  animation: stepPulse 2s ease-in-out infinite;
}