:root {
  --cl-navy-950: #060b1a;
  --cl-navy-900: #0a1128;
  --cl-navy-800: #101c3d;
  --cl-navy-700: #16264f;
  --cl-blue-500: #3b82f6;
  --cl-blue-400: #60a5fa;
  --cl-blue-300: #93c5fd;
  --cl-soft-blue: #cfe2ff;
  --cl-cyan: #22d3ee;
  --cl-white: #f6f9ff;
  --cl-muted: #93a4c9;
  --cl-glass-bg: rgba(255, 255, 255, 0.055);
  --cl-glass-border: rgba(147, 197, 253, 0.18);
  --cl-radius-lg: 22px;
  --cl-radius-md: 16px;
  --cl-radius-sm: 10px;
  --cl-shadow: 0 20px 60px -20px rgba(2, 8, 23, 0.65);
  --cl-gradient-primary: linear-gradient(135deg, #2563eb 0%, #22d3ee 100%);
  --cl-gradient-bg: radial-gradient(1200px 600px at 15% -10%, rgba(59, 130, 246, 0.20), transparent 60%),
                     radial-gradient(900px 500px at 100% 0%, rgba(34, 211, 238, 0.12), transparent 55%),
                     linear-gradient(180deg, var(--cl-navy-950), var(--cl-navy-900) 40%, var(--cl-navy-950));
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--cl-gradient-bg);
  background-attachment: fixed;
  color: var(--cl-white);
  font-family: 'Sora', 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
}

code, pre, .cl-mono, .cl-bits, .cl-hexval, .cl-matrix td {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
}

a { text-decoration: none; }

::selection { background: rgba(96, 165, 250, 0.35); }

/* ---------- Navbar ---------- */
.cl-navbar {
  background: rgba(6, 11, 26, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--cl-glass-border);
  padding-top: .65rem;
  padding-bottom: .65rem;
}

.cl-brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--cl-white) !important;
  letter-spacing: .2px;
}

.cl-brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--cl-gradient-primary);
  box-shadow: 0 6px 18px -6px rgba(37, 99, 235, .8);
  color: #fff;
  font-size: 1rem;
}

.navbar-nav .nav-link {
  color: var(--cl-muted);
  font-weight: 500;
  font-size: .93rem;
  padding: .5rem .9rem !important;
  border-radius: 8px;
  transition: color .2s ease, background .2s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--cl-white);
  background: rgba(96, 165, 250, 0.10);
}

.cl-main { padding-top: 76px; }

/* ---------- Glass Card ---------- */
.cl-glass {
  background: var(--cl-glass-bg);
  border: 1px solid var(--cl-glass-border);
  border-radius: var(--cl-radius-lg);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  box-shadow: var(--cl-shadow);
}

/* ---------- Hero ---------- */
.cl-hero {
  position: relative;
  padding: 7.5rem 0 5rem;
  overflow: hidden;
}

.cl-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .4rem .9rem;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(96, 165, 250, 0.28);
  color: var(--cl-blue-300);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.cl-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  margin: 1.3rem 0 1.2rem;
  letter-spacing: -0.02em;
}

.cl-hero .cl-gradient-text {
  background: var(--cl-gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.cl-hero p.lead {
  color: var(--cl-muted);
  font-size: 1.12rem;
  max-width: 620px;
}

.cl-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2.2rem;
}

.cl-hero-stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cl-white);
}

.cl-hero-stat span {
  color: var(--cl-muted);
  font-size: .82rem;
}

.cl-hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .55;
  z-index: 0;
}

.cl-btn-primary {
  background: var(--cl-gradient-primary);
  border: none;
  color: #fff;
  font-weight: 600;
  padding: .75rem 1.6rem;
  border-radius: 12px;
  box-shadow: 0 10px 30px -10px rgba(37, 99, 235, .7);
  transition: transform .18s ease, box-shadow .18s ease;
}

.cl-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px -8px rgba(37, 99, 235, .85);
  color: #fff;
}

.cl-btn-outline {
  background: transparent;
  border: 1px solid var(--cl-glass-border);
  color: var(--cl-white);
  font-weight: 600;
  padding: .75rem 1.6rem;
  border-radius: 12px;
  transition: all .18s ease;
}

.cl-btn-outline:hover {
  border-color: var(--cl-blue-400);
  background: rgba(96, 165, 250, 0.08);
  color: var(--cl-white);
}

/* ---------- Section headings ---------- */
.cl-section { padding: 5rem 0; }
.cl-section-eyebrow {
  color: var(--cl-blue-300);
  font-weight: 700;
  font-size: .8rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.cl-section h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.4rem);
  font-weight: 800;
  margin-top: .5rem;
}
.cl-section p.cl-lead-sm {
  color: var(--cl-muted);
  max-width: 640px;
}

/* ---------- Algorithm info cards ---------- */
.cl-info-card {
  padding: 1.75rem;
  height: 100%;
  transition: transform .25s ease, border-color .25s ease;
}
.cl-info-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96, 165, 250, 0.4);
}
.cl-info-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.14);
  color: var(--cl-blue-300);
  font-size: 1.3rem;
  margin-bottom: 1rem;
}
.cl-info-card h5 { font-weight: 700; margin-bottom: .5rem; }
.cl-info-card p { color: var(--cl-muted); font-size: .92rem; margin-bottom: 0; }
.cl-info-card .cl-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  color: var(--cl-cyan);
  background: rgba(34, 211, 238, .1);
  padding: .2rem .55rem;
  border-radius: 999px;
  margin-bottom: .8rem;
}

/* ---------- Module cards ---------- */
.cl-module-card {
  padding: 2rem;
  height: 100%;
  position: relative;
  overflow: hidden;
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.cl-module-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--cl-gradient-primary);
  opacity: 0;
  transition: opacity .28s ease;
  z-index: 0;
}
.cl-module-card:hover {
  transform: translateY(-8px);
  border-color: rgba(96, 165, 250, .45);
  box-shadow: 0 26px 70px -20px rgba(37, 99, 235, .45);
}
.cl-module-card > * { position: relative; z-index: 1; }
.cl-module-badge {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cl-gradient-primary);
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
  margin-bottom: 1.3rem;
  box-shadow: 0 10px 24px -8px rgba(37,99,235,.6);
}
.cl-module-card h4 { font-weight: 750; margin-bottom: .6rem; }
.cl-module-card p { color: var(--cl-muted); font-size: .9rem; }
.cl-module-meta {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin: 1rem 0 1.4rem;
}
.cl-module-meta span {
  font-size: .72rem;
  font-weight: 600;
  padding: .25rem .6rem;
  border-radius: 999px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.08);
  color: var(--cl-soft-blue);
}
.cl-module-link {
  color: var(--cl-blue-300);
  font-weight: 650;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.cl-module-link i { transition: transform .2s ease; }
.cl-module-card:hover .cl-module-link i { transform: translateX(4px); }

/* ---------- Module workspace ---------- */
.cl-workspace-hero {
  padding: 6.5rem 0 2rem;
}
.cl-workspace-hero h1 { font-weight: 800; font-size: clamp(1.9rem, 4vw, 2.6rem); }
.cl-workspace-hero p { color: var(--cl-muted); max-width: 700px; }

.cl-panel {
  padding: 1.75rem;
  margin-bottom: 1.75rem;
}
.cl-panel-title {
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: .55rem;
  margin-bottom: 1.2rem;
}
.cl-panel-title i { color: var(--cl-blue-400); }

.form-label { color: var(--cl-soft-blue); font-weight: 600; font-size: .88rem; }

.cl-input {
  background: rgba(6, 11, 26, 0.55);
  border: 1px solid var(--cl-glass-border);
  color: var(--cl-white);
  border-radius: var(--cl-radius-sm);
  padding: .7rem .9rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: .02em;
}
.cl-input:focus {
  background: rgba(6, 11, 26, 0.75);
  border-color: var(--cl-blue-400);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, .18);
  color: var(--cl-white);
}
.cl-input::placeholder { color: rgba(147, 164, 201, .55); }

.cl-mode-switch { display: flex; gap: .5rem; margin-bottom: 1.3rem; flex-wrap: wrap; }
.cl-mode-btn {
  flex: 1;
  min-width: 140px;
  border: 1px solid var(--cl-glass-border);
  background: rgba(255,255,255,.03);
  color: var(--cl-muted);
  border-radius: var(--cl-radius-sm);
  padding: .6rem 1rem;
  font-weight: 650;
  font-size: .88rem;
  transition: all .18s ease;
}
.cl-mode-btn.active {
  background: var(--cl-gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 8px 22px -8px rgba(37,99,235,.65);
}

.cl-action-row { display: flex; gap: .7rem; flex-wrap: wrap; margin-top: 1.4rem; }
.cl-btn-sm-action {
  padding: .6rem 1.3rem;
  font-size: .88rem;
  border-radius: 10px;
  font-weight: 650;
}
.cl-btn-ghost {
  background: rgba(255,255,255,.04);
  border: 1px solid var(--cl-glass-border);
  color: var(--cl-white);
}
.cl-btn-ghost:hover { border-color: var(--cl-blue-400); color: var(--cl-white); background: rgba(96,165,250,.08); }

.cl-alert {
  border-radius: var(--cl-radius-sm);
  border: 1px solid rgba(248, 113, 113, .4);
  background: rgba(248, 113, 113, .1);
  color: #fecaca;
  padding: .85rem 1.1rem;
  font-size: .9rem;
  display: none;
}
.cl-alert.show { display: block; }

.cl-output-box {
  background: rgba(6, 11, 26, 0.6);
  border: 1px solid var(--cl-glass-border);
  border-radius: var(--cl-radius-sm);
  padding: 1.1rem 1.2rem;
  word-break: break-all;
  font-size: 1.05rem;
  min-height: 56px;
  display: flex;
  align-items: center;
  color: var(--cl-cyan);
  font-weight: 600;
}

.cl-copy-btn {
  background: rgba(255,255,255,.05);
  border: 1px solid var(--cl-glass-border);
  color: var(--cl-muted);
  border-radius: 8px;
  padding: .3rem .6rem;
  font-size: .8rem;
}
.cl-copy-btn:hover { color: var(--cl-white); border-color: var(--cl-blue-400); }

/* ---------- Solution panel ---------- */
.cl-solution { display: none; }
.cl-solution.show { display: block; animation: cl-fade-in .3s ease; }

@keyframes cl-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.cl-step {
  border: 1px solid var(--cl-glass-border);
  border-radius: var(--cl-radius-md);
  background: rgba(255,255,255,.025);
  margin-bottom: 1rem;
  overflow: hidden;
}
.cl-step-header {
  padding: .9rem 1.2rem;
  display: flex;
  align-items: center;
  gap: .7rem;
  cursor: pointer;
  font-weight: 650;
  font-size: .95rem;
  user-select: none;
}
.cl-step-header .cl-step-num {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--cl-gradient-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem;
  color: #fff;
  flex-shrink: 0;
}
.cl-step-header .bi-chevron-down { margin-left: auto; transition: transform .2s ease; color: var(--cl-muted); }
.cl-step.open .cl-step-header .bi-chevron-down { transform: rotate(180deg); }
.cl-step-body {
  padding: 0 1.2rem 1.1rem 1.2rem;
  display: none;
  font-size: .88rem;
  color: var(--cl-soft-blue);
}
.cl-step.open .cl-step-body { display: block; }

.cl-kv { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; margin-bottom: .5rem; }
.cl-kv div { display: flex; gap: .4rem; align-items: baseline; }
.cl-kv .k { color: var(--cl-muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; }
.cl-kv .v { font-family: 'JetBrains Mono', monospace; color: var(--cl-white); font-weight: 600; word-break: break-all; }

.cl-bits {
  display: inline-block;
  padding: .35rem .6rem;
  background: rgba(6,11,26,.5);
  border: 1px solid var(--cl-glass-border);
  border-radius: 8px;
  color: var(--cl-cyan);
  letter-spacing: .06em;
  word-break: break-all;
}

table.cl-table-mini {
  width: 100%;
  font-size: .82rem;
  border-collapse: collapse;
  margin-top: .5rem;
}
table.cl-table-mini th, table.cl-table-mini td {
  border: 1px solid var(--cl-glass-border);
  padding: .4rem .55rem;
  text-align: center;
  color: var(--cl-soft-blue);
}
table.cl-table-mini th { color: var(--cl-blue-300); background: rgba(59,130,246,.08); }

/* ---------- Matrix (AES / S-AES) ---------- */
.cl-matrix {
  display: inline-block;
  border-collapse: separate;
  border-spacing: 6px;
}
.cl-matrix td {
  width: 46px; height: 46px;
  background: rgba(6,11,26,.55);
  border: 1px solid var(--cl-glass-border);
  border-radius: 9px;
  text-align: center;
  vertical-align: middle;
  font-weight: 700;
  color: var(--cl-cyan);
  font-size: .95rem;
}
.cl-matrix-label { font-size: .78rem; color: var(--cl-muted); margin-bottom: .35rem; text-transform: uppercase; letter-spacing: .04em; }
.cl-matrix-row { display: flex; flex-wrap: wrap; gap: 2.5rem; margin-bottom: .8rem; }
.cl-matrix-block { text-align: center; }

/* ---------- About / footer ---------- */
.cl-footer {
  background: var(--cl-navy-950);
  border-top: 1px solid var(--cl-glass-border);
  padding: 4rem 0 2rem;
  margin-top: 3rem;
}
.cl-footer-text { color: var(--cl-muted); font-size: .9rem; }
.cl-footer-heading { color: var(--cl-white); font-weight: 700; font-size: .9rem; margin-bottom: .9rem; }
.cl-footer-links li { margin-bottom: .5rem; }
.cl-footer-links a { color: var(--cl-muted); font-size: .88rem; }
.cl-footer-links a:hover { color: var(--cl-blue-300); }
.cl-footer-hr { border-color: var(--cl-glass-border); margin: 2rem 0 1.2rem; }
.cl-footer-copy { color: var(--cl-muted); font-size: .82rem; text-align: center; margin-bottom: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 991px) {
  .cl-hero { padding: 6rem 0 3rem; }
  .cl-workspace-hero { padding: 5.5rem 0 1.5rem; }
}
@media (max-width: 576px) {
  .cl-matrix td { width: 38px; height: 38px; font-size: .82rem; }
  .cl-mode-btn { min-width: 100%; }
}