/* ============================================================
   style.css — Sito Penetration Testing
   Dark theme ispirato a OffSec, colori: #0d0d1a / #7b2fff / #00d4ff
   ============================================================ */

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

:root {
  --bg-primary:    #0d0d1a;
  --bg-secondary:  #111128;
  --bg-card:       #161630;
  --bg-card-hover: #1e1e42;
  --accent-purple: #7b2fff;
  --accent-cyan:   #00d4ff;
  --accent-green:  #39ff14;
  --text-primary:  #e8e8f0;
  --text-muted:    #8888aa;
  --text-dim:      #555577;
  --border:        #252545;
  --border-glow:   #7b2fff40;
  --shadow-glow:   0 0 30px #7b2fff30;
  --font-main:     'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono:     'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  --radius:        12px;
  --radius-sm:     8px;
  --transition:    0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ── SCROLLBAR ────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-purple); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-cyan); }

/* ── SELECTION ────────────────────────────────────────────────── */
::selection { background: #7b2fff55; color: #fff; }

/* ── UTILITY ──────────────────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 1.5rem; }
.text-center { text-align: center; }
.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tag-purple { background: #7b2fff22; color: var(--accent-purple); border: 1px solid #7b2fff44; }
.tag-cyan   { background: #00d4ff22; color: var(--accent-cyan);   border: 1px solid #00d4ff44; }
.tag-green  { background: #39ff1422; color: var(--accent-green);  border: 1px solid #39ff1444; }

/* ── ANIMATION CLASSES ────────────────────────────────────────── */
.anim-ready { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.anim-ready.visible { opacity: 1; transform: translateY(0); }

/* ── NAVBAR ───────────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
  background: transparent;
}
#navbar.scrolled {
  background: rgba(13, 13, 26, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border), 0 4px 30px rgba(0,0,0,0.5);
  padding: 0.65rem 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.nav-logo .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.nav-logo .logo-text { color: var(--text-primary); }
.nav-logo .logo-dot { color: var(--accent-cyan); }

#nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
#nav-menu a {
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
#nav-menu a:hover,
#nav-menu a.active {
  color: var(--text-primary);
  background: #7b2fff18;
}
#nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}
.nav-cta {
  background: linear-gradient(135deg, var(--accent-purple), #5500cc) !important;
  color: #fff !important;
  padding: 0.5rem 1.2rem !important;
  border-radius: 9999px !important;
  font-weight: 700 !important;
  transition: opacity var(--transition), transform var(--transition) !important;
}
.nav-cta:hover { opacity: 0.85; transform: scale(1.03); }

/* Hamburger */
#hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none; border: none;
}
#hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
#hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
#hamburger.active span:nth-child(2) { opacity: 0; }
#hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── HERO ─────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-slides {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.5s ease;
}
.hero-slide.active { opacity: 1; }
.hero-slide::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(13,13,26,0.92) 0%,
    rgba(13,13,26,0.75) 50%,
    rgba(123,47,255,0.20) 100%
  );
}
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(123,47,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123,47,255,0.06) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 8rem 1.5rem 4rem;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #7b2fff22;
  border: 1px solid #7b2fff55;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
}
.hero-badge::before { content: '▶'; font-size: 0.6rem; }
.hero-title {
  font-size: clamp(2.2rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  text-shadow: 0 4px 30px rgba(0,0,0,0.8);
}
.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-bottom: 1.5rem;
  min-height: 2em;
}
.hero-subtitle::before { content: '$ '; color: var(--accent-green); }
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}
.hero-btns {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-purple), #5500cc);
  color: #fff;
  box-shadow: 0 4px 20px #7b2fff44;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px #7b2fff66; }
.btn-outline {
  background: transparent;
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}
.btn-outline:hover {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: bounce 2s infinite;
}
.hero-scroll-hint::after {
  content: '';
  display: block;
  width: 2px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-purple), transparent);
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ── MARQUEE (tools bar) ──────────────────────────────────────── */
.marquee-section {
  padding: 1.5rem 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}
.marquee-section::before,
.marquee-section::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 150px;
  z-index: 2;
}
.marquee-section::before { left: 0; background: linear-gradient(to right, var(--bg-secondary), transparent); }
.marquee-section::after  { right: 0; background: linear-gradient(to left, var(--bg-secondary), transparent); }
.marquee-track {
  display: flex;
  gap: 2rem;
  width: max-content;
  animation: marquee 30s linear infinite;
}
.marquee-track:hover { animation-play-state: paused; }
.marquee-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 9999px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition);
}
.marquee-item:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); }
.marquee-item .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-purple); }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ── SECTIONS ─────────────────────────────────────────────────── */
.section { padding: 5rem 0; }
.section-alt { background: var(--bg-secondary); }

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-purple);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.section-label::before {
  content: '';
  display: block;
  width: 24px; height: 2px;
  background: var(--accent-purple);
}
.section-title {
  font-size: clamp(1.7rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.7;
}

/* ── CHAPTER CARDS ────────────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
  opacity: 0;
  transition: opacity var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}
.card:hover::before { opacity: 1; }

.card-number {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--accent-purple);
  font-weight: 700;
  letter-spacing: 0.1em;
}
.card-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  background: linear-gradient(135deg, #7b2fff22, #00d4ff11);
  border: 1px solid #7b2fff33;
  flex-shrink: 0;
}
.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}
.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}
.card-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
  transition: gap var(--transition);
  text-decoration: none;
}
.card:hover .card-link { gap: 0.7rem; }
.card-link::after { content: '→'; }

/* ── STATS ────────────────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}
.stat-item {
  text-align: center;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}
.stat-item:hover { border-color: var(--border-glow); }
.stat-value {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── CHAPTER PAGE: HERO ───────────────────────────────────────── */
.chapter-hero {
  padding: 9rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.chapter-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, #7b2fff22 0%, transparent 70%);
  pointer-events: none;
}
.chapter-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(123,47,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123,47,255,0.05) 1px, transparent 1px);
  background-size: 50px 50px;
}
.chapter-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.chapter-breadcrumb a { color: var(--accent-cyan); }
.chapter-breadcrumb span { color: var(--text-dim); }
.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-purple);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}
.chapter-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}
.chapter-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  line-height: 1.7;
  margin-bottom: 2rem;
}
.chapter-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.chapter-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.chapter-meta-item strong { color: var(--text-primary); }

/* ── PARAGRAPH SECTIONS ───────────────────────────────────────── */
.para-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border);
}
.para-section:last-child { border-bottom: none; }
.para-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-purple);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
.para-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}
.para-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.para-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.para-text p { margin-bottom: 1rem; }
.para-text p:last-child { margin-bottom: 0; }
.para-text strong { color: var(--text-primary); }

/* ── CODE BLOCKS ──────────────────────────────────────────────── */
.code-block {
  background: #080814;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-purple);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  color: #c8c8e8;
  overflow-x: auto;
  position: relative;
}
.code-block::before {
  content: attr(data-lang);
  position: absolute;
  top: 0.5rem; right: 0.75rem;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.code-block .kw   { color: #c792ea; }
.code-block .fn   { color: #82aaff; }
.code-block .str  { color: #c3e88d; }
.code-block .cmt  { color: #546e7a; font-style: italic; }
.code-block .var  { color: #f07178; }
.code-block .num  { color: #f78c6c; }

/* ── INFO BOXES ───────────────────────────────────────────────── */
.info-box {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.info-box-title { font-weight: 700; margin-bottom: 0.4rem; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; }
.info-box p { color: var(--text-muted); line-height: 1.6; }
.info-warning { background: #ff990011; border-color: #ff9900; }
.info-warning .info-box-title { color: #ff9900; }
.info-danger  { background: #ff444411; border-color: #ff4444; }
.info-danger  .info-box-title { color: #ff4444; }
.info-tip     { background: #00d4ff11; border-color: var(--accent-cyan); }
.info-tip     .info-box-title { color: var(--accent-cyan); }
.info-note    { background: #7b2fff11; border-color: var(--accent-purple); }
.info-note    .info-box-title { color: var(--accent-purple); }

/* ── TOOL LIST ────────────────────────────────────────────────── */
.tool-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.tool-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}
.tool-item:hover { border-color: var(--border-glow); }
.tool-icon {
  width: 36px; height: 36px;
  border-radius: 6px;
  background: linear-gradient(135deg, #7b2fff33, #00d4ff11);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.tool-name { font-weight: 700; font-size: 0.9rem; color: var(--accent-cyan); font-family: var(--font-mono); }
.tool-desc { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.2rem; }

/* ── STEPS LIST ───────────────────────────────────────────────── */
.steps-list { display: flex; flex-direction: column; gap: 1.25rem; margin-top: 1.5rem; }
.step-item { display: flex; gap: 1rem; align-items: flex-start; }
.step-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-purple), #5500cc);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.78rem;
  font-weight: 800;
  flex-shrink: 0;
  color: #fff;
}
.step-body { flex: 1; }
.step-title { font-weight: 700; font-size: 0.95rem; margin-bottom: 0.3rem; }
.step-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ── TOC (sidebar indice capitolo) ───────────────────────────── */
.chapter-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 3rem;
  align-items: start;
}
.toc {
  position: sticky;
  top: 5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
}
.toc-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}
.toc a {
  display: block;
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  border-radius: 0 4px 4px 0;
}
.toc a:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); }
.toc a.active { color: var(--accent-cyan); border-color: var(--accent-purple); background: #7b2fff11; }

/* ── CHAPTER NAV (prev/next) ──────────────────────────────────── */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 1rem;
}
.chapter-nav-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition), transform var(--transition);
  max-width: 280px;
}
.chapter-nav-btn:hover { border-color: var(--border-glow); transform: translateY(-2px); }
.chapter-nav-btn.prev { flex-direction: row-reverse; text-align: right; }
.chapter-nav-label { font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.2rem; }
.chapter-nav-title { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); }
.chapter-nav-icon { font-size: 1.5rem; color: var(--accent-purple); flex-shrink: 0; }

/* ── FOOTER ───────────────────────────────────────────────────── */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand .logo-text {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.footer-brand p { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; max-width: 280px; }
.footer-col-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 1rem;
}
.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent-cyan); }
.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.footer-security-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 4px 12px;
  background: #39ff1411;
  border: 1px solid #39ff1433;
  border-radius: 9999px;
  font-size: 0.72rem;
  color: var(--accent-green);
}

/* ── INTRO SECTION ────────────────────────────────────────────── */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.intro-image-wrap {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
}
.intro-image-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #7b2fff22, transparent);
  pointer-events: none;
}
.intro-image-wrap img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.intro-features { display: flex; flex-direction: column; gap: 1rem; margin-top: 2rem; }
.intro-feature {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.intro-feature-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #7b2fff33, #00d4ff11);
  border: 1px solid #7b2fff33;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.intro-feature-title { font-weight: 700; font-size: 0.95rem; margin-bottom: 0.25rem; }
.intro-feature-desc  { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

/* ── SECURITY BADGE SECTION ───────────────────────────────────── */
.security-bar {
  background: #080814;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
}
.security-bar-inner {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
}
.sec-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.sec-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-green); }

/* ── RESPONSIVE ───────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .chapter-layout { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .intro-grid { grid-template-columns: 1fr; }
  .intro-image-wrap { display: none; }
}

@media (max-width: 768px) {
  #hamburger { display: flex; }
  #nav-menu {
    position: fixed;
    top: 0; right: -100%;
    width: min(320px, 80vw);
    height: 100vh;
    background: rgba(13,13,26,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem 2rem 2rem;
    transition: right var(--transition);
    border-left: 1px solid var(--border);
    overflow-y: auto;
    z-index: 999;
  }
  #nav-menu.open { right: 0; }
  #nav-menu a { width: 100%; padding: 0.75rem 1rem; font-size: 1rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2.2rem; }
  .cards-grid { grid-template-columns: 1fr; }
  .chapter-nav { flex-direction: column; }
  .chapter-nav-btn { max-width: 100%; width: 100%; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-list { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .section { padding: 3rem 0; }
  .hero-btns { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr; }
}

/* ── GLOWING LINES DECORATIVE ─────────────────────────────────── */
.glow-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-purple), var(--accent-cyan), transparent);
  margin: 0;
  opacity: 0.5;
}

/* ── CHAPTER SPECIFIC COLORS ──────────────────────────────────── */
.cap1 { --chapter-color: #ff6b6b; }
.cap2 { --chapter-color: #ffd93d; }
.cap3 { --chapter-color: #6bcb77; }
.cap4 { --chapter-color: #4d96ff; }
.cap5 { --chapter-color: #c77dff; }

.card.cap1:hover { border-color: #ff6b6b44; box-shadow: 0 0 30px #ff6b6b22; }
.card.cap2:hover { border-color: #ffd93d44; box-shadow: 0 0 30px #ffd93d22; }
.card.cap3:hover { border-color: #6bcb7744; box-shadow: 0 0 30px #6bcb7722; }
.card.cap4:hover { border-color: #4d96ff44; box-shadow: 0 0 30px #4d96ff22; }
.card.cap5:hover { border-color: #c77dff44; box-shadow: 0 0 30px #c77dff22; }