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

:root {
  --c-bg:       #0d0e1a;
  --c-bg2:      #13152a;
  --c-card:     #1a1d35;
  --c-accent:   #7c4dff;
  --c-accent2:  #00e5ff;
  --c-text:     #e2e4f0;
  --c-muted:    #8a8fa8;
  --c-border:   #2a2d4a;
  --c-warn:     #ff6b35;
  --radius:     12px;
  --shadow:     0 4px 32px rgba(124,77,255,.18);
  --trans:      .35s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

a { color: var(--c-accent2); text-decoration: none; transition: color var(--trans); }
a:hover { color: #fff; }

code {
  background: rgba(124,77,255,.18);
  color: var(--c-accent2);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: .88em;
}

ul { list-style: none; }

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===========================
   HEADER
=========================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(13,14,26,.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-border);
  height: 68px;
  display: flex;
  align-items: center;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: .04em;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav__link {
  color: var(--c-muted);
  font-size: .95rem;
  padding: 6px 14px;
  border-radius: 8px;
  transition: color var(--trans), background var(--trans);
}

.nav__link:hover {
  color: #fff;
  background: rgba(255,255,255,.07);
}

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.burger span {
  display: block;
  width: 100%; height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--trans), opacity var(--trans);
}
.burger--active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger--active span:nth-child(2) { opacity: 0; }
.burger--active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================
   HERO
=========================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 68px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 60% at 70% 40%, rgba(124,77,255,.22) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 70%, rgba(0,229,255,.12) 0%, transparent 70%),
    var(--c-bg);
  animation: heroBg 8s ease-in-out infinite alternate;
}

@keyframes heroBg {
  0%   { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(30deg); }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 760px;
  padding: 80px 24px;
  animation: fadeUp .9s both;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #fff 40%, var(--c-accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__sub {
  font-size: 1.15rem;
  color: var(--c-muted);
  margin-bottom: 36px;
  max-width: 580px;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--trans), box-shadow var(--trans), background var(--trans);
  border: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--c-accent), #5c33d4);
  color: #fff;
  box-shadow: 0 6px 28px rgba(124,77,255,.38);
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(124,77,255,.55);
  color: #fff;
}

.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.hero__scroll span {
  display: block;
  width: 24px; height: 24px;
  border-right: 2px solid var(--c-accent);
  border-bottom: 2px solid var(--c-accent);
  transform: rotate(45deg);
  opacity: .6;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(10px); }
}

/* ===========================
   SECTIONS
=========================== */
.section {
  padding: 100px 0;
}

.section--dark {
  background: var(--c-bg2);
}

.section__title {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(90deg, #fff, var(--c-accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section__lead {
  color: var(--c-muted);
  font-size: 1.05rem;
  margin-bottom: 48px;
  max-width: 680px;
}

/* ===========================
   CARDS
=========================== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 56px;
}

.card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform var(--trans), box-shadow var(--trans);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.card__icon { font-size: 2.2rem; margin-bottom: 16px; }
.card__title { font-size: 1.12rem; font-weight: 700; margin-bottom: 10px; color: #fff; }

/* ===========================
   TEXT BLOCK
=========================== */
.text-block {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.text-block p {
  color: var(--c-muted);
  font-size: 1rem;
}

/* ===========================
   STEPS
=========================== */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  left: 36px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-accent), var(--c-accent2));
  opacity: .35;
}

.step {
  display: flex;
  gap: 28px;
  padding: 32px 0;
  border-bottom: 1px solid var(--c-border);
}

.step:last-child { border-bottom: none; }

.step__num {
  flex-shrink: 0;
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--c-accent), #5c33d4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 900;
  color: #fff;
  box-shadow: 0 4px 20px rgba(124,77,255,.45);
  position: relative;
  z-index: 1;
}

.step__body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}

.step__body p { color: var(--c-muted); }

/* ===========================
   TWO COLUMN GRID
=========================== */
.grid-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

/* ===========================
   INFO BLOCK
=========================== */
.info-block {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px;
}

.info-block h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.info-block p { color: var(--c-muted); margin-bottom: 12px; }

.info-block ul { margin-top: 8px; }
.info-block ul li {
  padding: 6px 0 6px 22px;
  position: relative;
  color: var(--c-muted);
  font-size: .95rem;
}
.info-block ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--c-accent2);
  font-weight: 700;
}

/* ===========================
   WARNING BOX
=========================== */
.warning-box {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: rgba(255,107,53,.1);
  border: 1px solid rgba(255,107,53,.3);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 40px 0;
  color: #ffb39a;
}

.warning-box__icon { font-size: 1.5rem; flex-shrink: 0; }

/* ===========================
   FEATURES
=========================== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform var(--trans), box-shadow var(--trans), border-color var(--trans);
}

.feature:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--c-accent);
}

.feature__icon { font-size: 2rem; margin-bottom: 14px; }
.feature h3 { font-size: 1.05rem; font-weight: 700; color: #fff; margin-bottom: 10px; }
.feature p { color: var(--c-muted); font-size: .95rem; }

/* ===========================
   SECURITY GRID
=========================== */
.security-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.sec-item {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 26px;
  border-left: 3px solid var(--c-accent);
  transition: transform var(--trans);
}

.sec-item:hover { transform: translateX(4px); }

.sec-item h3 { font-size: 1.02rem; font-weight: 700; color: #fff; margin-bottom: 10px; }
.sec-item p { color: var(--c-muted); font-size: .95rem; }

/* ===========================
   TOR CHAIN
=========================== */
.tech-box {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px;
}

.tech-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 24px;
}

.tor-chain {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.tor-node {
  background: rgba(124,77,255,.2);
  border: 1px solid var(--c-accent);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: .85rem;
  font-weight: 600;
  color: #fff;
}

.tor-node--dest {
  background: rgba(0,229,255,.15);
  border-color: var(--c-accent2);
  color: var(--c-accent2);
}

.tor-arrow { color: var(--c-muted); font-size: 1.2rem; }

.tech-list li {
  padding: 7px 0 7px 22px;
  position: relative;
  color: var(--c-muted);
  font-size: .93rem;
  border-bottom: 1px solid var(--c-border);
}
.tech-list li:last-child { border-bottom: none; }
.tech-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--c-accent2);
  font-weight: 700;
  font-size: 1.1rem;
}

/* ===========================
   FAQ
=========================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--trans);
}

.faq-item--open { border-color: var(--c-accent); }

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  gap: 16px;
}

.faq-icon {
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: rgba(124,77,255,.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--c-accent);
  transition: transform var(--trans), background var(--trans);
}

.faq-item--open .faq-icon {
  transform: rotate(45deg);
  background: var(--c-accent);
  color: #fff;
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .45s cubic-bezier(.4,0,.2,1), padding var(--trans);
  padding: 0 24px;
}

.faq-a p { color: var(--c-muted); font-size: .97rem; }

.faq-item--open .faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ===========================
   FOOTER
=========================== */
.footer {
  background: #09091a;
  border-top: 1px solid var(--c-border);
  padding-top: 64px;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer__logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
}

.footer__desc { color: var(--c-muted); font-size: .9rem; line-height: 1.6; }

.footer__heading {
  font-size: .9rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 16px;
}

.footer__links li { margin-bottom: 10px; }
.footer__links a { color: var(--c-muted); font-size: .9rem; }
.footer__links a:hover { color: var(--c-accent2); }

.footer__col p { color: var(--c-muted); font-size: .88rem; line-height: 1.65; }

.footer__bottom {
  border-top: 1px solid var(--c-border);
  padding: 18px 0;
  text-align: center;
  color: var(--c-muted);
  font-size: .82rem;
}

/* ===========================
   ANIMATIONS
=========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(40px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card--anim,
.step--anim,
.info-block--anim,
.feature--anim,
.sec-item--anim,
.faq-item--anim {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}

.card--anim.in-view,
.step--anim.in-view,
.info-block--anim.in-view,
.feature--anim.in-view,
.sec-item--anim.in-view,
.faq-item--anim.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delay */
.card--anim:nth-child(2), .feature--anim:nth-child(2), .sec-item--anim:nth-child(2) { transition-delay: .1s; }
.card--anim:nth-child(3), .feature--anim:nth-child(3), .sec-item--anim:nth-child(3) { transition-delay: .2s; }
.feature--anim:nth-child(4), .sec-item--anim:nth-child(4) { transition-delay: .3s; }
.feature--anim:nth-child(5), .sec-item--anim:nth-child(5) { transition-delay: .4s; }
.feature--anim:nth-child(6), .sec-item--anim:nth-child(6) { transition-delay: .5s; }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 900px) {
  .grid-two { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .burger { display: flex; }

  .nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(13,14,26,.97);
    backdrop-filter: blur(14px);
    padding: 24px;
    gap: 4px;
    border-bottom: 1px solid var(--c-border);
  }

  .nav--open { display: flex; }
  .nav__link { width: 100%; padding: 12px 16px; font-size: 1.05rem; }

  .section { padding: 64px 0; }

  .steps::before { left: 30px; }
  .step__num { width: 60px; height: 60px; font-size: 1.1rem; }

  .tor-chain { gap: 6px; }
  .tor-node { padding: 6px 10px; font-size: .78rem; }

  .footer__inner { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 480px) {
  .hero__content { padding: 60px 0; }
  .step { flex-direction: column; gap: 16px; }
  .steps::before { display: none; }
}