/*
 * Dual PC Guide - Standalone stylesheet
 * No base import - full control, minimal !important
 */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

:root {
  --zms-100: #98BAE3;
  --zms-300: #5981B1;
  --zms-500: #365475;
  --zms-700: #15273C;
  --zms-900: #020408;
  --text: #E8EEF9;
  --muted: #bcd1ee;
  --accent: #8ab4ff;
  --chip: #19273a;
  --round: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --header-offset: 96px;
}

body {
  margin: 0;
  font-family: 'Rubik', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(135deg, #5981B1, #365475);
  background-attachment: fixed;
}

.page-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { color: var(--zms-100); }

/* ========== Header & Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgb(14,22,35);
  border-bottom: 1px solid rgba(152,186,227,.18);
}

.site-header .inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}
.brand img { height: 32px; width: auto; display: block; }

nav {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Desktop: show nav-links only */
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 12px;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 8px;
  transition: background-color 0.2s, color 0.2s;
  white-space: nowrap;
}
.nav-link:hover {
  background-color: rgba(152, 186, 227, 0.1);
  color: var(--accent);
}
.nav-link:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Hamburger: hidden on desktop */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}
.hamburger span {
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.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(7px, -6px); }

/* Dropdown: desktop = hidden (prevents duplicate nav) */
.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: rgba(14,22,35, 0.98);
  border: 1px solid rgba(152,186,227,.18);
  border-radius: 12px;
  padding: 8px 0;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.25s ease;
  z-index: 1000;
}

.dropdown-nav-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dropdown-item {
  display: block;
  padding: 12px 20px;
  color: var(--text);
  font-weight: 500;
  transition: background-color 0.2s, color 0.2s;
}
.dropdown-item:hover {
  background-color: rgba(152, 186, 227, 0.1);
  color: var(--accent);
}

/* Mobile: hide nav-links, show hamburger & dropdown */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .dropdown-menu {
    display: block;
    visibility: hidden;
    opacity: 0;
  }
  .dropdown-menu.active {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }
  .site-header .inner { padding: 12px 14px; }
}

/* ========== Hero ========== */
.hero-wrap {
  background: radial-gradient(900px 600px at 12% -10%, rgba(152,186,227, 0.22), transparent 70%),
              radial-gradient(900px 600px at 100% 0%, rgba(54,84,117, 0.22), transparent 70%),
              rgba(14,22,35, 0.95);
  padding: 56px 20px 28px;
  position: relative;
}

.hero {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: clamp(28px, 4.2vw, 54px);
  margin: 10px 0 4px;
  color: var(--text);
  font-weight: 600;
}

.hero p {
  color: var(--muted);
  margin: 0 0 18px;
}

.hero-image {
  margin: 14px auto 0;
  max-width: 600px;
  border-radius: var(--round);
  overflow: hidden;
  border: 1px solid rgba(152,186,227, 0.1);
  box-shadow: var(--shadow);
  background: var(--zms-700);
}

.hero-image img {
  width: 100%;
  height: clamp(180px, 28vw, 340px);
  object-fit: cover;
  display: block;
}

/* ========== Main content ========== */
.alt-b {
  flex: 1;
  background: rgba(14,22,35, 0.4);
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px;
}

section[id] { scroll-margin-top: calc(var(--header-offset) + 20px); }
main section { padding: 30px 0; }

h2 {
  font-size: clamp(22px, 2.6vw, 34px);
  margin: 0 0 8px;
  color: var(--text);
}

h3 {
  font-size: clamp(18px, 2.2vw, 24px);
  margin: 18px 0 6px;
  color: var(--text);
}

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

/* Cards */
.card {
  background: var(--zms-700);
  border: 1px solid rgba(152,186,227, 0.18);
  border-radius: var(--round);
  padding: 24px;
  margin: 20px 0;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  color: var(--text);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.45);
}

.card h2, .card h3, .card h4, .card strong { color: var(--text); }
.card p, .card li, .card ol, .card i { color: var(--muted); }

.card img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

/* Dual PC specifics */
.dualpc-head {
  margin: 0 0 10px;
  padding-bottom: 6px;
  font-size: clamp(22px, 2.6vw, 34px);
  color: var(--text);
  position: relative;
}
.dualpc-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 72px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--zms-300));
}

.dualpc-sub {
  margin: 0 0 8px;
  padding-bottom: 6px;
  font-size: clamp(20px, 2.2vw, 28px);
  color: var(--text);
  position: relative;
}
.dualpc-sub::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--zms-300), #8ee);
}
.dualpc-sub.drawbacks::after {
  background: linear-gradient(90deg, var(--accent), #ffb3a8);
}

.dualpc-grid-2 {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (max-width: 800px) {
  .dualpc-grid-2 { grid-template-columns: 1fr; }
}

/* Lists */
ul { color: var(--muted); }
ul li { margin-bottom: 8px; }

/* Code */
code {
  background: var(--chip);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: #0f1928;
  color: var(--text);
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.14s, box-shadow 0.2s;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(89,129,177, 0.4);
}

/* Footer */
footer {
  border-top: 1px solid rgba(152,186,227, 0.25);
  background: radial-gradient(circle at 50% -30%, rgba(152,186,227, 0.08), transparent 80%),
              rgba(14,22,35, 0.95);
}

.foot {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: center;
}

/* Back to top FAB */
#toTop {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 9999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(152,186,227, 0.5);
  background: var(--accent);
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.35);
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.15s ease;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

#toTop.show {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

#toTop:hover {
  background: var(--zms-300);
  transform: translateY(-2px);
}

/* Utils */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

@media (max-width: 768px) {
  .hero-wrap { padding: 40px 20px 20px; }
  .wrap { padding: 20px; }
}