/* SteelBloom — sb- namespace */
/* Global tokens */
:root {
  /* LIBRARY COLOR PALETTE */
  --sb-primary: #5b7f67;            /* Deep Library Green */
  --sb-surface: #e8dfcf;            /* Muted Page Beige */
  --sb-paper: #0f1210;              /* Dark Green-Black */
  --sb-ink: #f7f2e8;                /* Parchment Cream */
  --sb-edge: rgba(247,242,232,0.18);       /* Soft warm edge */
  --sb-edge-strong: rgba(247,242,232,0.45);
  --sb-shadow: rgba(0,0,0,0.22);

  /* Motion */
  --sb-motion-fast: 150ms;
  --sb-motion-med: 260ms;
  --sb-motion-slow: 420ms;
  --sb-easing: cubic-bezier(.22,.61,.36,1);

  /* Radius scale */
  --sb-r1: 6px;
  --sb-r2: 10px;
  --sb-r3: 14px;

  /* Width & spacing */
  --sb-max: 900px;
  --sb-pad: 22px;
}

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

/* BODY BACKGROUND — Literary dusk gradient */
body {
  background: linear-gradient(135deg, #1a201d, #151a17 45%, #1e241f 100%);
  color: var(--sb-ink);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* MOVING BACKGROUND WASH */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(120% 60% at 80% 20%, rgba(255,255,255,.04), transparent 60%),
              linear-gradient(120deg, rgba(255,255,255,.01), rgba(255,255,255,.03));
  animation: sb-wash 24s ease-in-out infinite alternate;
  opacity: .32;
}
@keyframes sb-wash {
  0% { transform: translate3d(0,0,0) scale(1); }
  100% { transform: translate3d(0,-2%,0) scale(1.02); }
}

/* GLOBAL CONTAINER */
.sb-container {
  width: 100%;
  max-width: var(--sb-max);
  margin: 0 auto;
  padding: var(--sb-pad);
}

/* NAVIGATION — centered + dramatic glow animations */
.sb-nav {
  display: flex;
  justify-content: center;
  gap: 36px;
  padding: 26px var(--sb-pad);
  border-bottom: 1px solid var(--sb-edge);
}

.sb-nav a {
  color: var(--sb-ink);
  text-decoration: none;
  font-weight: 600;
  position: relative;
  padding: 10px 14px;
  transition:
    color var(--sb-motion-med) var(--sb-easing),
    transform var(--sb-motion-med) var(--sb-easing),
    text-shadow var(--sb-motion-med) var(--sb-easing);
}

/* STRONGER, WIDER GLOW PLATE */
.sb-nav a::before {
  content: "";
  position: absolute;
  inset: -8px -14px;
  border-radius: var(--sb-r2);
  background: radial-gradient(circle at center,
      rgba(115,155,130,0.55) 0%,
      rgba(115,155,130,0.22) 35%,
      rgba(115,155,130,0.05) 70%,
      transparent 100%
  );
  opacity: 0;
  filter: blur(14px);
  transform: scale(0.6);
  transition:
    opacity var(--sb-motion-med) var(--sb-easing),
    transform var(--sb-motion-med) var(--sb-easing),
    filter var(--sb-motion-med) var(--sb-easing);
}

/* BRIGHTER AND THICKER UNDERLINE FLARE */
.sb-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 3px;
  background: linear-gradient(90deg,
      rgba(255,255,235,1),
      var(--sb-primary),
      rgba(255,255,235,0.22)
  );
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--sb-motion-med) var(--sb-easing);
}

/* DRAMATIC HOVER EFFECT */
.sb-nav a:hover {
  color: #ffffff;
  transform: translateY(-4px) scale(1.06);
  text-shadow: 0 0 14px rgba(255,255,240,0.55);
}

.sb-nav a:hover::before {
  opacity: 1;
  filter: blur(18px);
  transform: scale(1.1);
}

.sb-nav a:hover::after {
  transform: scaleX(1);
}

/* HEADINGS */
h1, h2, h3 {
  font-weight: 700;
  color: var(--sb-ink);
  margin-bottom: 18px;
}

h1 {
  font-size: 2rem;
  margin-top: 28px;
}

h2 {
  font-size: 1.4rem;
  margin-top: 40px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 28px;
}

/* ONE-IMAGE RULE — hero */
.sb-hero {
  margin: 28px 0 36px 0;
  border-radius: var(--sb-r3);
  border: 1px solid var(--sb-edge);
  overflow: hidden;
  background: #000;
  box-shadow: 0 6px 22px var(--sb-shadow);
}

.sb-hero img {
  width: 100%;
  display: block;
}

/* PARAGRAPHS — mandatory justification */
article p,
section p,
main p,
p {
  text-align: justify !important;
  text-justify: inter-word !important;
  -webkit-hyphens: auto !important;
  -ms-hyphens: auto !important;
  hyphens: auto !important;
  margin-bottom: 20px;
}

/* SECTION CAPSULE HEADER */
section.sb-section {
  position: relative;
  margin-top: 60px;
  padding-top: 10px;
  border-top: 1px solid var(--sb-edge);
}

section.sb-section::before {
  content: "";
  position: absolute;
  top: -8px; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--sb-primary), transparent);
  transition: width var(--sb-motion-slow) var(--sb-easing);
}

section.sb-section.is-seen::before {
  width: 100%;
}

/* LINK UNDERLINE GROW */
.sb-link {
  color: var(--sb-primary);
  position: relative;
  text-decoration: none;
}
.sb-link::after {
  content: "";
  position: absolute;
  left:0; right:0; bottom:-2px;
  height:2px;
  background: linear-gradient(90deg, var(--sb-primary), transparent);
  transform: scaleX(0);
  transform-origin:left;
  transition: transform var(--sb-motion-med) var(--sb-easing);
}
.sb-link:hover::after {
  transform: scaleX(1);
}

/* CARD LIFT */
.sb-card {
  border: 1px solid var(--sb-edge);
  border-radius: var(--sb-r2);
  padding: 18px;
  transition: transform var(--sb-motion-fast) var(--sb-easing),
              box-shadow var(--sb-motion-fast) var(--sb-easing),
              border-color var(--sb-motion-fast) var(--sb-easing);
  background: rgba(255,255,255,0.03);
}
.sb-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--sb-shadow);
  border-color: var(--sb-edge-strong);
}

/* FOOTER — dramatic library-themed glow */
footer {
  margin-top: 80px;
  padding: 60px 0;
  text-align: center;
  color: var(--sb-ink);
  position: relative;
  border-top: 1px solid var(--sb-edge);
}

/* Outer bloom halo */
footer::before {
  content: "";
  display: block;
  position: absolute;
  left: 50%;
  top: 28px;
  transform: translateX(-50%);
  width: 240px;
  height: 140px;
  background: radial-gradient(circle at center,
    rgba(115,155,130,0.38) 0%,
    rgba(115,155,130,0.18) 40%,
    rgba(115,155,130,0.08) 75%,
    transparent 100%
  );
  filter: blur(18px);
  border-radius: 20px;
  opacity: 0.75;
}

/* Inner plate */
footer::after {
  content: "";
  display: block;
  position: absolute;
  left: 50%;
  top: 28px;
  transform: translateX(-50%);
  width: 180px;
  height: 100px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--sb-edge-strong);
  border-radius: 14px;
  box-shadow: 0 8px 22px var(--sb-shadow);
  clip-path: polygon(
    22% 0%, 78% 0%,
    100% 32%, 100% 68%,
    78% 100%, 22% 100%,
    0% 68%, 0% 32%
  );
}

/* Copyright text */
footer span.sb-footer-text {
  position: relative;
  display: inline-block;
  padding: 14px 28px;
  margin-top: 48px;
  background: rgba(255,255,255,0.12);
  border-radius: var(--sb-r2);
  border: 1px solid var(--sb-edge-strong);
  box-shadow:
    0 6px 18px rgba(0,0,0,0.35),
    0 0 12px rgba(115,155,130,0.55);
  backdrop-filter: blur(4px);
  font-weight: 600;
  transition:
    transform var(--sb-motion-med) var(--sb-easing),
    box-shadow var(--sb-motion-med) var(--sb-easing),
    background var(--sb-motion-med) var(--sb-easing);
}

/* Hover ignition */
footer span.sb-footer-text:hover {
  transform: translateY(-3px) scale(1.05);
  background: rgba(255,255,255,0.22);
  box-shadow:
    0 10px 24px rgba(0,0,0,0.45),
    0 0 18px rgba(115,155,130,0.85),
    0 0 36px rgba(115,155,130,0.45);
}

/* READING PROGRESS BAR */
.sb-progress {
  position: fixed;
  left: 0; top: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--sb-primary), transparent);
  z-index: 9998;
  transition: width var(--sb-motion-fast) linear;
}

/* BACK TO TOP — diamond button */
.sb-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 54px;
  height: 54px;
  background: var(--sb-primary);
  color: #0a0a0a;
  font-weight: 700;
  line-height: 54px;
  text-align: center;
  cursor: pointer;
  opacity: 0 !important;
  pointer-events: none !important;
  transform: rotate(45deg) translateY(14px) !important;
  border: 1px solid rgba(255,255,255,0.25);
  box-shadow: 0 6px 16px var(--sb-shadow);
  transition: opacity .25s ease, transform .25s ease, background .2s ease;
  z-index: 9999 !important;
}

.sb-to-top.sb-show {
  opacity: 1 !important;
  pointer-events: auto !important;
  transform: rotate(45deg) translateY(0) !important;
}

.sb-to-top:hover {
  background: #ffffff;
}

/* Ripple */
.sb-to-top .ripple {
  position: absolute;
  border-radius: 999px;
  pointer-events: none;
  opacity: .35;
  transform: translate(-50%,-50%) scale(0);
  background: #fff;
  animation: sb-ripple .6s ease-out forwards;
}

@keyframes sb-ripple {
  to {
    transform: translate(-50%,-50%) scale(8);
    opacity: 0;
  }
}

/* RESPONSIVE HERO */
@media (max-width: 600px) {
  .sb-hero {
    margin: 20px 0 28px 0;
    border-radius: var(--sb-r2);
  }
}