/* ------------------------------------------------------------
   CobaltSketch Style System — Namespaced with cs-
   Pure CSS, no external fonts, no imports
   ------------------------------------------------------------ */

/* ------------------------------------------------------------
   Root tokens
   ------------------------------------------------------------ */
:root {
  --cs-primary: #0047AB; /* Cobalt */
  --cs-surface: #f5f7fa;
  --cs-paper: #ffffff;
  --cs-ink: #222;
  --cs-muted: #667;
  --cs-edge: rgba(0,0,0,0.15);
  --cs-edge-strong: rgba(0,0,0,0.28);

  /* Radius scale */
  --cs-radius-3: 3px;
  --cs-radius-5: 5px;
  --cs-radius-8: 8px;
  --cs-radius-pill: 40px;

  /* Shadow scale */
  --cs-shadow-1: 0 2px 5px rgba(0,0,0,0.06);
  --cs-shadow-2: 0 4px 10px rgba(0,0,0,0.07);
  --cs-shadow-soft: 0 6px 16px rgba(0,0,0,0.08);

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

  /* Layout width and spacing rhythm */
  --cs-max-width: 820px;
  --cs-space: 1.2rem;
}

/* Reduced motion override */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* ------------------------------------------------------------
   Base reset and global typography
   ------------------------------------------------------------ */
html, body {
  margin: 0;
  padding: 0;
  color: var(--cs-ink);
  background: var(--cs-surface);
  font-family: system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  scroll-behavior: smooth;
}

/* Ultra subtle animated background wash */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: 0.35;
  background:
      radial-gradient(120% 60% at 80% 20%, rgba(255,255,255,0.06), transparent 60%),
      linear-gradient(120deg, rgba(0,0,0,0.02), rgba(255,255,255,0.02));
  animation: cs-wash 24s ease-in-out infinite alternate;
}

@keyframes cs-wash {
  0% { transform: translate3d(0,0,0) scale(1); }
  100% { transform: translate3d(0,-2%,0) scale(1.02); }
}

/* ------------------------------------------------------------
   Layout structure
   ------------------------------------------------------------ */
.cs-header {
  text-align: center;
  padding: calc(var(--cs-space) * 1.2) 0 var(--cs-space) 0;
}

.cs-logo {
  width: 400px;
  height: auto;
}

.cs-nav ul {
  list-style: none;
  padding: 0;
  margin: var(--cs-space) 0 0 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.cs-nav a {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  border-radius: var(--cs-radius-5);
  color: var(--cs-ink);
  background: var(--cs-paper);
  border: 1px solid var(--cs-edge);
  box-shadow: var(--cs-shadow-1);
  position: relative;
  text-decoration: none;
  transition:
    background var(--cs-motion-fast) var(--cs-easing),
    box-shadow var(--cs-motion-fast) var(--cs-easing);
}

/* Link underline grow */
.cs-link,
.cs-nav a {
  position: relative;
}
.cs-link::after,
.cs-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--cs-primary), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--cs-motion-med) var(--cs-easing);
}
.cs-link:hover::after,
.cs-nav a:hover::after {
  transform: scaleX(1);
}

.cs-nav a:hover {
  background: #fff;
  box-shadow: var(--cs-shadow-2);
}

/* ------------------------------------------------------------
   Main content area
   ------------------------------------------------------------ */
.cs-main {
  display: flex;
  justify-content: center;
  padding: calc(var(--cs-space) * 2) var(--cs-space);
}

.cs-article {
  max-width: var(--cs-max-width);
}

.cs-h1 {
  font-size: 2rem;
  margin-bottom: calc(var(--cs-space) * 1.2);
  color: var(--cs-ink);
}

.cs-dek {
  margin-bottom: calc(var(--cs-space) * 1.2);
  color: var(--cs-muted);
  font-size: 1.12rem;
  line-height: 1.6;
}

/* ------------------------------------------------------------
   Hero image system
   ------------------------------------------------------------ */
.cs-hero {
  margin-bottom: calc(var(--cs-space) * 1.5);
}

.cs-hero img {
  width: 100%;
  height: auto;
  border-radius: var(--cs-radius-8);
  border: 2px solid var(--cs-primary);
  box-shadow: var(--cs-shadow-soft);
  display: block;
  max-height: 360px;
  object-fit: cover;
}

/* ------------------------------------------------------------
   NEW Section divider (Sketch Stroke Divider)
   ------------------------------------------------------------ */
.cs-section {
  margin-bottom: calc(var(--cs-space) * 2);
  position: relative;
  padding-top: calc(var(--cs-space) * 2.2);
}

.cs-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 6px;
  width: 100%;

  background:
      repeating-linear-gradient(
        to right,
        rgba(0,0,0,0) 0px,
        rgba(255,255,255,0) 6px,
        rgba(0,0,0,0.12) 7px,
        rgba(0,0,0,0.12) 9px
      ),
      linear-gradient(
        90deg,
        var(--cs-primary),
        rgba(0,0,0,0)
      );

  opacity: 0;
  transform: translateY(-4px);
  transition:
    opacity var(--cs-motion-slow) var(--cs-easing),
    transform var(--cs-motion-slow) var(--cs-easing);
}

.cs-section.is-seen::before {
  opacity: 1;
  transform: translateY(0);
}

.cs-section h2 {
  margin-bottom: calc(var(--cs-space) * 1);
  font-size: 1.5rem;
  color: var(--cs-ink);
}

/* Mandatory paragraph 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;
  line-height: 1.6;
  margin-bottom: 1.1rem;
}

/* ------------------------------------------------------------
   Card system
   ------------------------------------------------------------ */
.cs-card {
  border: 1px solid var(--cs-edge);
  border-radius: var(--cs-radius-5);
  background: var(--cs-paper);
  padding: var(--cs-space);
  transition:
    transform var(--cs-motion-fast) var(--cs-easing),
    box-shadow var(--cs-motion-fast) var(--cs-easing),
    border-color var(--cs-motion-fast) var(--cs-easing);
}

.cs-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--cs-shadow-soft);
  border-color: var(--cs-edge-strong);
}

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

/* ------------------------------------------------------------
   NEW Footer Capsule (centered + encapsulated)
   ------------------------------------------------------------ */
.cs-footer {
  display: flex;
  justify-content: center;
  margin-top: calc(var(--cs-space) * 3);
  padding-bottom: calc(var(--cs-space) * 3);
}

.cs-footer p {
  background: linear-gradient(180deg, #ffffff, #f0f4ff);
  padding: 0.9rem 2.2rem;
  border-radius: var(--cs-radius-pill);
  border: 2px solid rgba(0,71,171,0.25);
  color: var(--cs-muted);
  box-shadow: var(--cs-shadow-1);
  font-size: 0.95rem;
  letter-spacing: 0.4px;
  text-align: center;
  margin: 0;
}

/* ------------------------------------------------------------
   NEW Back-to-Top: Floating Cobalt Circle
   ------------------------------------------------------------ */
.cs-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: none;
  background: var(--cs-primary);
  color: #fff;
  font-size: 24px;
  line-height: 54px;
  text-align: center;
  cursor: pointer;
  opacity: 0 !important;
  transform: scale(0.85) translateY(10px) !important;
  pointer-events: none !important;
  transition:
    opacity var(--cs-motion-med) var(--cs-easing),
    transform var(--cs-motion-med) var(--cs-easing),
    box-shadow var(--cs-motion-med) var(--cs-easing),
    background var(--cs-motion-fast) var(--cs-easing);
  z-index: 9999 !important;
  overflow: hidden;
}

.cs-to-top:hover {
  background: #0a5adc;
  box-shadow: 0 8px 18px rgba(0,0,0,0.15);
}

.cs-to-top.cs-show {
  opacity: 1 !important;
  transform: scale(1) translateY(0) !important;
  pointer-events: auto !important;
}

.cs-to-top .ripple {
  position: absolute;
  border-radius: 999px;
  pointer-events: none;
  opacity: 0.35;
  transform: translate(-50%, -50%) scale(0);
  background: rgba(255,255,255,0.8);
  animation: cs-ripple .6s ease-out forwards;
}

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

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 600px) {
  .cs-nav a {
    padding: 0.4rem 0.9rem;
  }
  .cs-h1 {
    font-size: 1.7rem;
  }
  .cs-hero img {
    max-height: 260px;
  }
}