/* ========================================
   IFRPS GLOBAL DESIGN SYSTEM
======================================== */

:root {
  /* Brand colors */
  --color-bg: #07111b;
  --color-bg-deep: #080d12;
  --color-surface: #0e1720;
  --color-surface-alt: #131f2b;
  --color-border: #344250;
  --color-border-soft: #2c3946;

  --color-text: #f6f7f8;
  --color-text-muted: #bcc5cf;
  --color-text-subtle: #84909d;

  --color-gold: #d7b75f;
  --color-gold-soft: rgba(215, 183, 95, 0.18);

  /* Layout */
  --content-width: 1200px;
  --content-padding: 60px;
  --section-padding: 90px;

  /* Spacing */
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Typography */
  --font-family-base: Arial, Helvetica, sans-serif;

  /* Effects */
  --transition-fast: 160ms ease;
  --transition-normal: 250ms ease;
}

/* ========================================
   RESET / BASE
======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;

  color: var(--color-text);
  background:
    radial-gradient(
      circle at top,
      #24364b 0%,
      #101923 55%,
      var(--color-bg-deep) 100%
    );

  font-family: var(--font-family-base);
  line-height: 1.5;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 3px;
}

/* ========================================
   SHARED SITE HEADER
======================================== */

.site-header {
  width: 100%;
  padding: 12px var(--content-padding);

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

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

.logo img {
  height: 100px;
  width: auto;
  display: block;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-header nav a {
  color: #d7dde5;
  transition: color var(--transition-fast);
}

.site-header nav a:hover,
.site-header nav a.active {
  color: var(--color-gold);
}

/* ========================================
   SHARED HERO
======================================== */

.hero {
  width: min(950px, calc(100% - 40px));
  margin: auto;
  padding: var(--section-padding) 0;
  text-align: center;
}

.eyebrow {
  margin-bottom: 22px;

  color: var(--color-gold);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 0.95;
}

h1 span {
  display: block;
  color: var(--color-gold);
}

.hero-description {
  max-width: 710px;
  margin: 30px auto;

  color: #c9d0d8;
  font-size: 1.15rem;
  line-height: 1.7;
}

.hero-buttons {
  margin-top: 38px;

  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* ========================================
   SHARED BUTTONS
======================================== */

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: 14px 22px;
  border-radius: var(--radius-sm);

  font-weight: 700;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.primary-button {
  color: #111820;
  background: var(--color-gold);
}

.primary-button:hover {
  transform: translateY(-1px);
}

.secondary-button {
  border: 1px solid #647080;
}

.secondary-button:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* ========================================
   SHARED FOOTER
======================================== */

footer {
  margin-top: auto;
  padding: 24px;
  color: var(--color-text-subtle);
  text-align: center;
}

/* ========================================
   INTRO ANIMATION
======================================== */

body.intro-active {
  overflow: hidden;
}

#intro-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  overflow: hidden;

  background:
    radial-gradient(
      circle at 50% 40%,
      #263a50 0%,
      #101923 55%,
      #070b10 100%
    );

  transition:
    opacity 0.8s ease,
    visibility 0.8s ease;
}

#intro-screen.intro-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro-stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.intro-object {
  position: absolute;
  top: 50%;
  left: 50%;

  display: block;
  max-width: none;

  pointer-events: none;
  user-select: none;
  will-change: transform, opacity;
}

/* Paper */

.intro-paper {
  z-index: 1;
  width: clamp(180px, 22vw, 300px);
  opacity: 0;

  animation:
    paper-fall 2.6s cubic-bezier(0.2, 0.7, 0.3, 1) forwards,
    paper-pinned 0.25s 3.08s ease-out forwards,
    paper-crushed 0.3s 4.34s ease-out forwards;
}

/* Scissors */

.intro-scissors {
  z-index: 2;
  width: clamp(190px, 24vw, 320px);
  opacity: 0;

  animation:
    scissors-fall 0.9s 2.45s cubic-bezier(0.15, 0.8, 0.2, 1.05) forwards,
    scissors-crushed 0.3s 4.34s ease-out forwards;
}

/* Rock */

.intro-rock {
  z-index: 4;
  width: clamp(220px, 28vw, 380px);
  opacity: 0;

  animation:
    rock-fall 0.72s 3.82s cubic-bezier(0.55, 0, 1, 0.55) forwards;
}

/* Impact flash */

.intro-flash {
  position: absolute;
  top: 54%;
  left: 50%;
  z-index: 5;

  width: 320px;
  height: 320px;

  border-radius: 50%;
  opacity: 0;

  transform: translate(-50%, -50%) scale(0.15);

  background:
    radial-gradient(
      circle,
      rgba(255, 247, 211, 0.95) 0%,
      rgba(215, 183, 95, 0.45) 35%,
      transparent 72%
    );

  animation:
    impact-flash 0.45s 4.33s ease-out forwards;
}

/* Dust */

.dust {
  position: absolute;
  top: 61%;
  left: 50%;
  z-index: 3;

  width: 45px;
  height: 45px;

  border-radius: 50%;
  opacity: 0;

  background: rgba(190, 181, 161, 0.6);
  filter: blur(7px);
}

.dust-a {
  animation: dust-left 1s 4.3s ease-out forwards;
}

.dust-b {
  animation: dust-right 1s 4.3s ease-out forwards;
}

.dust-c {
  animation: dust-up 1s 4.3s ease-out forwards;
}

/* Final intro branding */

.intro-logo {
  position: absolute;
  top: 47%;
  left: 50%;
  z-index: 8;

  margin: 0;
  opacity: 0;

  color: var(--color-text);
  font-size: clamp(3rem, 9vw, 7rem);
  font-weight: 900;
  letter-spacing: 0.18em;

  transform: translate(-50%, -50%) scale(0.85);

  text-shadow: 0 12px 35px rgba(0, 0, 0, 0.5);

  animation:
    intro-logo-show 0.85s 5s ease-out forwards;
}

.intro-tagline {
  position: absolute;
  top: 60%;
  left: 50%;
  z-index: 8;

  width: 90%;
  margin: 0;

  opacity: 0;

  color: var(--color-gold);
  font-size: clamp(0.7rem, 1.7vw, 1rem);
  font-weight: 800;
  letter-spacing: 0.17em;
  text-align: center;
  text-transform: uppercase;

  transform: translate(-50%, 15px);

  animation:
    intro-tagline-show 0.75s 5.25s ease-out forwards;
}

/* Skip button */

.intro-skip {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 20;

  padding: 9px 15px;

  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;

  color: var(--color-text);
  background: rgba(0, 0, 0, 0.25);

  cursor: pointer;
}

.intro-skip:hover {
  background: rgba(255, 255, 255, 0.12);
}

/* Impact */

#intro-screen.impact {
  animation: screen-shake 0.36s linear;
}

/* ========================================
   KEYFRAMES
======================================== */

@keyframes paper-fall {
  0% {
    opacity: 0;
    transform:
      translate(-50%, -170vh)
      rotate(-20deg)
      scale(0.82)
      skewX(-4deg);
  }

  12% {
    opacity: 1;
  }

  32% {
    transform:
      translate(-32%, -115%)
      rotate(13deg)
      scale(0.92)
      skewX(4deg);
  }

  56% {
    transform:
      translate(-66%, -82%)
      rotate(-10deg)
      scale(1)
      skewX(-3deg);
  }

  78% {
    transform:
      translate(-40%, -60%)
      rotate(6deg)
      scale(1.03)
      skewX(2deg);
  }

  100% {
    opacity: 1;
    transform:
      translate(-50%, -42%)
      rotate(-2deg)
      scale(1)
      skewX(0);
  }
}

@keyframes paper-pinned {
  0% {
    transform:
      translate(-50%, -42%)
      rotate(-2deg)
      scale(1);
  }

  50% {
    transform:
      translate(-50%, -37%)
      rotate(-5deg)
      scale(1.07, 0.93);
  }

  100% {
    transform:
      translate(-50%, -42%)
      rotate(-4deg)
      scale(1);
  }
}

@keyframes paper-crushed {
  to {
    opacity: 0.25;
    transform:
      translate(-50%, -35%)
      rotate(-6deg)
      scale(1.18, 0.3);
  }
}

@keyframes scissors-fall {
  0% {
    opacity: 0;
    transform:
      translate(-50%, -180vh)
      rotate(210deg)
      scale(0.72);
  }

  15% {
    opacity: 1;
  }

  68% {
    transform:
      translate(-50%, -25%)
      rotate(-8deg)
      scale(1.12);
  }

  84% {
    transform:
      translate(-50%, -48%)
      rotate(-7deg)
      scale(0.96);
  }

  100% {
    opacity: 1;
    transform:
      translate(-50%, -42%)
      rotate(-8deg)
      scale(1);
  }
}

@keyframes scissors-crushed {
  to {
    opacity: 0.35;
    transform:
      translate(-50%, -30%)
      rotate(-12deg)
      scale(1.15, 0.35);
  }
}

@keyframes rock-fall {
  0% {
    opacity: 0;
    transform:
      translate(-50%, -190vh)
      rotate(-16deg)
      scale(0.8);
  }

  15% {
    opacity: 1;
  }

  75% {
    transform:
      translate(-50%, -25%)
      rotate(5deg)
      scale(1.18, 0.84);
  }

  88% {
    transform:
      translate(-50%, -49%)
      rotate(2deg)
      scale(0.92, 1.08);
  }

  100% {
    opacity: 1;
    transform:
      translate(-50%, -42%)
      rotate(2deg)
      scale(1);
  }
}

@keyframes impact-flash {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.15);
  }

  30% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.6);
  }
}

@keyframes dust-left {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.3);
  }

  30% {
    opacity: 0.85;
  }

  100% {
    opacity: 0;
    transform: translate(-250px, 35px) scale(3.2);
  }
}

@keyframes dust-right {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.3);
  }

  30% {
    opacity: 0.85;
  }

  100% {
    opacity: 0;
    transform: translate(200px, 28px) scale(3);
  }
}

@keyframes dust-up {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.3);
  }

  30% {
    opacity: 0.75;
  }

  100% {
    opacity: 0;
    transform: translate(-20px, -190px) scale(2.7);
  }
}

@keyframes screen-shake {
  0%,
  100% {
    transform: translate(0);
  }

  15% {
    transform: translate(-10px, 6px);
  }

  30% {
    transform: translate(9px, -7px);
  }

  45% {
    transform: translate(-7px, 5px);
  }

  60% {
    transform: translate(6px, -4px);
  }

  75% {
    transform: translate(-4px, 3px);
  }

  90% {
    transform: translate(2px, -1px);
  }
}

@keyframes intro-logo-show {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.85);
  }

  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes intro-tagline-show {
  from {
    opacity: 0;
    transform: translate(-50%, 15px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* ========================================
   RESPONSIVE
======================================== */

@media (max-width: 900px) {
  :root {
    --content-padding: 32px;
  }
}

@media (max-width: 700px) {
  :root {
    --content-padding: 20px;
    --section-padding: 60px;
  }

  .site-header {
    align-items: flex-start;
  }

  .site-header nav {
    display: none;
  }

  .hero {
    padding: var(--section-padding) 0;
  }

  .logo img {
    height: 80px;
  }
}

@media (max-width: 600px) {
  .intro-paper {
    width: 190px;
  }

  .intro-scissors {
    width: 200px;
  }

  .intro-rock {
    width: 235px;
  }
}

/* Accessibility: respect reduced-motion preference */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  #intro-screen {
    display: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}