/* =============================================
   CryptoSkills — Global Styles
   Dark industrial theme with neon green accent
   ============================================= */

:root {
  --bg: #080c0a;
  --bg2: #0e1410;
  --bg3: #131a15;
  --card: #111711;
  --card2: #161e17;
  --border: rgba(74, 222, 128, 0.12);
  --border2: rgba(74, 222, 128, 0.22);
  --accent: #4ade80;
  --accent2: #22c55e;
  --accent-dim: rgba(74, 222, 128, 0.15);
  --text: #e8f5e9;
  --text2: #9ab09c;
  --text3: #607060;
  --mono: 'DM Mono', monospace;
  --sans: 'Syne', sans-serif;
  --radius: 12px;
  --radius2: 18px;
}

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

html { scroll-behavior: smooth; }

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

/* NOISE OVERLAY */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ======================== NAV ======================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.2rem;
  background: rgba(8, 12, 10, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span { color: var(--text); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links a {
  color: var(--text2);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
  transition: all 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

.nav-cta {
  background: var(--accent-dim) !important;
  color: var(--accent) !important;
  border: 1px solid var(--border2) !important;
}
.nav-cta:hover { background: var(--accent2) !important; color: #000 !important; }

/* ======================== BUTTONS ======================== */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #000;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.01em;
}
.btn-primary:hover { background: #fff; transform: translateY(-1px); }

.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--text2);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid var(--border2);
  cursor: pointer;
  transition: all 0.2s;
}
.btn-ghost:hover { color: var(--accent); border-color: var(--accent); }

.full-btn { width: 100%; text-align: center; }

/* ======================== HERO ======================== */
.hero {
  position: relative;
  padding: 3.5rem 1.4rem 3rem;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(74,222,128,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--border2);
  padding: 0.3rem 0.8rem;
  border-radius: 99px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
  animation: fadeUp 0.6s ease both;
}

.hero-title {
  font-size: clamp(2.4rem, 8vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1.2rem;
  animation: fadeUp 0.6s 0.1s ease both;
}

.accent { color: var(--accent); }

.hero-sub {
  font-size: 0.95rem;
  color: var(--text2);
  max-width: 500px;
  margin: 0 auto 2rem;
  line-height: 1.65;
  animation: fadeUp 0.6s 0.2s ease both;
}

.hero-btns {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  animation: fadeUp 0.6s 0.3s ease both;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  animation: fadeUp 0.6s 0.4s ease both;
}

.stat { text-align: center; }
.stat-num { display: block; font-size: 1.5rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.75rem; color: var(--text3); font-family: var(--mono); }
.stat-divider { width: 1px; height: 32px; background: var(--border2); }

/* ======================== SECTIONS ======================== */
.section-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.section-title {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.8rem;
  line-height: 1.15;
}

/* ======================== FEATURES ======================== */
.features {
  padding: 3rem 1.4rem;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 1.3rem 1rem;
  transition: border-color 0.2s;
}
.feature-card:hover { border-color: var(--border2); }

.feature-icon { font-size: 1.5rem; margin-bottom: 0.7rem; }
.feature-card h3 { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.4rem; }
.feature-card p { font-size: 0.78rem; color: var(--text2); line-height: 1.55; }

/* ======================== FEATURED COURSES ======================== */
.featured {
  padding: 3rem 1.4rem;
}

.courses-preview {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.course-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 1.3rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.course-card:hover { border-color: var(--accent); transform: translateX(4px); }

.course-badge {
  position: absolute;
  top: 0.7rem;
  right: 0.8rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  background: var(--accent);
  color: #000;
  padding: 0.15rem 0.5rem;
  border-radius: 99px;
  font-weight: 500;
}
.course-badge.hot { background: #f97316; }

.course-emoji { font-size: 1.8rem; flex-shrink: 0; }
.course-card h3 { font-size: 0.92rem; font-weight: 700; margin-bottom: 0.2rem; }
.course-card p { font-size: 0.78rem; color: var(--text2); margin-bottom: 0.4rem; }
.course-price { font-family: var(--mono); font-size: 0.82rem; color: var(--accent); font-weight: 500; }

.center-btn { display: block; text-align: center; }

/* ======================== CTA STRIP ======================== */
.cta-strip {
  padding: 3rem 1.4rem;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.cta-strip h2 { font-size: 1.5rem; font-weight: 800; margin-bottom: 0.6rem; letter-spacing: -0.03em; }
.cta-strip p { font-size: 0.88rem; color: var(--text2); margin-bottom: 1.5rem; }

/* ======================== FOOTER ======================== */
.footer {
  padding: 2.5rem 1.4rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-logo { font-weight: 800; font-size: 1.1rem; color: var(--accent); margin-bottom: 0.4rem; }
.footer-sub { font-size: 0.8rem; color: var(--text3); margin-bottom: 1.2rem; }

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-bottom: 1rem;
}
.footer-links a { color: var(--text2); text-decoration: none; font-size: 0.82rem; }
.footer-links a:hover { color: var(--accent); }

.footer-note { font-family: var(--mono); font-size: 0.68rem; color: var(--text3); margin-bottom: 0.6rem; }
.footer-copy { font-size: 0.72rem; color: var(--text3); }

/* ======================== PAGE HEADER ======================== */
.page-header {
  padding: 3rem 1.4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute;
  top: -60%;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(74,222,128,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.page-title { font-size: clamp(2rem, 7vw, 3rem); font-weight: 800; letter-spacing: -0.04em; margin-bottom: 0.8rem; }
.page-sub { font-size: 0.88rem; color: var(--text2); max-width: 480px; margin: 0 auto; line-height: 1.6; }

/* ======================== FILTER TABS ======================== */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  padding: 0 1.4rem 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.filter-tabs::-webkit-scrollbar { display: none; }

.filter-btn {
  flex-shrink: 0;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text2);
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn.active, .filter-btn:hover {
  background: var(--accent-dim);
  border-color: var(--border2);
  color: var(--accent);
}

/* ======================== COURSES SECTION ======================== */
.courses-section { padding: 0 1.4rem 3rem; }

.courses-grid {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.course-full-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 1.4rem;
  transition: border-color 0.2s;
}
.course-full-card:hover { border-color: var(--border2); }

.cfc-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 0.7rem; }
.cfc-emoji { font-size: 2rem; }
.cfc-badge {
  font-family: var(--mono);
  font-size: 0.58rem;
  background: var(--accent);
  color: #000;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  font-weight: 500;
  letter-spacing: 0.06em;
}
.cfc-badge.hot { background: #f97316; }
.cfc-badge.new { background: #60a5fa; }
.cfc-badge.bestseller { background: var(--accent); }

.cfc-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; }
.cfc-desc { font-size: 0.83rem; color: var(--text2); line-height: 1.6; margin-bottom: 0.9rem; }

.cfc-includes {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1.2rem;
}
.cfc-includes li { font-size: 0.78rem; color: var(--text2); }
.cfc-includes li { font-size: 0.8rem; color: #9ab09c; }

.cfc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.cfc-price-block { display: flex; flex-direction: column; }
.cfc-price { font-family: var(--mono); font-size: 1.1rem; color: var(--accent); font-weight: 500; }
.cfc-usd { font-family: var(--mono); font-size: 0.7rem; color: var(--text3); }

.buy-btn {
  background: var(--accent);
  color: #000;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.6rem 1.2rem;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}
.buy-btn:hover { background: #fff; transform: scale(1.03); }

/* ======================== MODAL ======================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  position: relative;
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 24px 24px 0 0;
  padding: 2rem 1.4rem 2.5rem;
  width: 100%;
  max-width: 480px;
  max-height: 88vh;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1);
}
.modal-overlay.open .modal { transform: translateY(0); }

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--card2);
  border: 1px solid var(--border);
  color: var(--text2);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.modal-close:hover { color: var(--text); border-color: var(--accent); }

.modal-step { display: flex; flex-direction: column; gap: 1rem; }
.modal-step.hidden { display: none; }

.modal-icon { font-size: 2.2rem; text-align: center; }
.modal-title { font-size: 1.3rem; font-weight: 800; text-align: center; letter-spacing: -0.03em; }
.modal-course-name { text-align: center; font-size: 0.85rem; color: var(--accent); font-family: var(--mono); }
.modal-sub { text-align: center; font-size: 0.83rem; color: var(--text2); line-height: 1.55; }
.modal-note { font-size: 0.75rem; color: var(--text3); text-align: center; }
.modal-note a { color: var(--accent); text-decoration: none; }

.network-label { font-family: var(--mono); font-size: 0.7rem; color: var(--text3); text-transform: uppercase; letter-spacing: 0.06em; }

.network-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}
.network-grid.small { }

.net-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text2);
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.6rem 0.5rem;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}
.net-btn.active, .net-btn:hover {
  background: var(--accent-dim);
  border-color: var(--border2);
  color: var(--accent);
}
.net-icon { font-size: 1rem; }

.amount-display {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}
.amount-label { font-size: 0.72rem; color: var(--text3); font-family: var(--mono); margin-bottom: 0.3rem; }
.amount-value { font-family: var(--mono); font-size: 1.6rem; color: var(--accent); font-weight: 500; }
.amount-usd { font-family: var(--mono); font-size: 0.75rem; color: var(--text3); }

.address-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.address-label { font-size: 0.7rem; color: var(--text3); font-family: var(--mono); margin-bottom: 0.5rem; }
.address-wrap { display: flex; align-items: center; gap: 0.5rem; }
.address-text {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text);
  word-break: break-all;
  flex: 1;
  line-height: 1.5;
}
.copy-btn {
  flex-shrink: 0;
  background: var(--accent-dim);
  border: 1px solid var(--border2);
  color: var(--accent);
  font-size: 0.72rem;
  font-family: var(--sans);
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover { background: var(--accent); color: #000; }

.wallet-deep-link { display: block; text-align: center; }

.tx-input {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s;
}
.tx-input:focus { border-color: var(--accent); }
.tx-input::placeholder { color: var(--text3); }

.result-icon { font-size: 3rem; text-align: center; }

/* ======================== ABOUT ======================== */
.about-section { padding: 2rem 1.4rem 3rem; }

.about-grid { display: flex; flex-direction: column; gap: 2rem; }

.about-text h2 { font-size: 1.2rem; font-weight: 700; margin: 1.2rem 0 0.5rem; color: var(--accent); }
.about-text h2:first-child { margin-top: 0; }
.about-text p { font-size: 0.87rem; color: var(--text2); line-height: 1.65; margin-bottom: 0.6rem; }
.about-text .btn-primary { margin-top: 0.8rem; }

.about-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 1.3rem;
  margin-bottom: 1rem;
}
.about-card:last-child { margin-bottom: 0; }
.about-card-icon { font-size: 1.5rem; margin-bottom: 0.7rem; }
.about-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.6rem; }
.about-card p { font-size: 0.82rem; color: var(--text2); line-height: 1.55; margin-bottom: 0.8rem; }
.about-card-note { font-family: var(--mono); font-size: 0.68rem; color: var(--text3); margin-top: 0.5rem; }

.network-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.network-list li { font-size: 0.83rem; color: var(--text2); display: flex; align-items: center; gap: 0.5rem; }
.nl-icon { font-size: 1rem; }

.about-address {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--accent);
  word-break: break-all;
  line-height: 1.5;
  background: var(--bg3);
  padding: 0.6rem;
  border-radius: 8px;
  margin-bottom: 0.3rem !important;
}

/* ======================== HOW IT WORKS ======================== */
.how-it-works { padding: 3rem 1.4rem; background: var(--bg2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 1.2rem;
  margin-bottom: 0.6rem;
}
.step-num { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); margin-bottom: 0.4rem; }
.step h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.3rem; }
.step p { font-size: 0.8rem; color: var(--text2); }

.step-arrow { text-align: center; font-size: 1.2rem; color: var(--text3); margin: -0.2rem 0; }

/* ======================== ANIMATIONS ======================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ======================== DESKTOP TWEAKS ======================== */
@media (min-width: 640px) {
  .features-grid { grid-template-columns: 1fr 1fr; }
  .courses-grid { display: grid; grid-template-columns: 1fr 1fr; }
  .steps { flex-direction: row; align-items: flex-start; }
  .step { flex: 1; }
  .step-arrow { padding-top: 2rem; flex-shrink: 0; }
  .about-grid { flex-direction: row; }
  .about-text { flex: 1; }
  .about-aside { width: 280px; flex-shrink: 0; }
  .modal { border-radius: 24px; margin: auto; }
  .modal-overlay { align-items: center; }
}

@media (min-width: 900px) {
  .courses-grid { grid-template-columns: 1fr 1fr 1fr; }
  .features-grid { grid-template-columns: 1fr 1fr 1fr 1fr; }
  .nav { padding: 1rem 2rem; }
  .hero { padding: 5rem 2rem 4rem; }
  .features, .featured, .cta-strip, .how-it-works, .courses-section, .about-section { padding-left: 2rem; padding-right: 2rem; max-width: 1100px; margin-left: auto; margin-right: auto; }
}