:root {
  --bg: #0b1725;
  --bg-elevated: #111e30;
  --accent: #2f8de4;
  --accent-soft: #244d7a;
  --text: #f4f7fb;
  --muted: #b4c2d6;
  --danger: #ff6b6b;
  --success: #2ecc71;
  --border: #25344a;
  --card-radius: 16px;
  --shadow-soft: 0 18px 45px rgba(0,0,0,0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #172842 0, #050910 55%, #020308 100%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ----- HEADER ----- */

header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(5,10,20,0.95), rgba(5,10,20,0.8));
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #8fd4ff, #2f8de4 45%, #12233a 70%, #020308 100%);
  box-shadow: 0 0 22px rgba(47,141,228,0.6);
  position: relative;
  overflow: hidden;
}

.brand-logo::before,
.brand-logo::after {
  content: "";
  position: absolute;
  inset: 26%;
  border-radius: 999px;
  border: 2px solid rgba(255,255,255,0.55);
  border-top-color: transparent;
  border-right-color: transparent;
  transform: rotate(-35deg);
}

.brand-text h1 {
  font-size: 1.05rem;
  margin: 0;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

nav button {
  border: none;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.82rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.2s ease, color 0.2s ease, transform 0.12s ease;
}

nav button .icon {
  font-size: 0.95rem;
}

nav button.active,
nav button:hover {
  background: rgba(47,141,228,0.16);
  color: var(--text);
  transform: translateY(-1px);
}

/* ----- MAIN LAYOUT ----- */

main {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 18px 16px 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.section {
  width: 100%;
}

/* ----- HERO ----- */

.hero {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 2.3fr) minmax(0, 2fr);
}

.hero-card,
.panel {
  background: radial-gradient(circle at top left, rgba(74,139,233,0.14), transparent 60%),
              linear-gradient(145deg, rgba(18,33,54,0.98), rgba(8,14,24,0.98));
  border-radius: var(--card-radius);
  padding: 18px 18px 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 0),
    radial-gradient(circle at 0 0, rgba(89,158,255,0.2), transparent 64%);
  background-size: 160px 1px, auto;
  mix-blend-mode: soft-light;
  opacity: 0.5;
  pointer-events: none;
}

.hero-title {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.hero-subtitle {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 12px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(180,194,214,0.45);
  color: var(--muted);
  background: rgba(4,8,16,0.9);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.hero-stat label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: block;
  color: rgba(180,194,214,0.7);
}

.hero-stat span {
  font-size: 0.92rem;
  color: var(--text);
}

.hero-note {
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ----- ÁLTALÁNOS SZEKCIÓK ----- */

.section-title {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.section-subtitle {
  font-size: 0.84rem;
  color: var(--muted);
  margin-bottom: 10px;
}

/* ----- HIDAK LAYOUT ----- */

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(0, 2.4fr);
  gap: 18px;
  align-items: flex-start;
}

/* Szűrők */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.chip {
  font-size: 0.78rem;
  border-radius: 999px;
  border: 1px solid rgba(180,194,214,0.4);
  padding: 4px 10px;
  background: rgba(7,14,26,0.9);
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

.chip .dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--accent);
  opacity: 0.6;
}

.chip.active {
  background: linear-gradient(135deg, var(--accent), #4ca3ff);
  border-color: rgba(255,255,255,0.65);
  color: #07111f;
  transform: translateY(-1px);
}

.chip.active .dot {
  background: #07111f;
  opacity: 0.9;
}

/* Híd kártyák */

.bridge-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.bridge-card {
  background: radial-gradient(circle at top left, rgba(68,126,214,0.25), transparent 64%),
              linear-gradient(150deg, rgba(12,22,38,0.98), rgba(6,11,20,0.98));
  border-radius: 14px;
  padding: 10px 11px 10px;
  border: 1px solid rgba(74,118,178,0.7);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.14s ease, box-shadow 0.14s ease, border-color 0.14s ease;
}

.bridge-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(0,0,0,0.55);
  border-color: rgba(115,176,255,1);
}

.bridge-card::after {
  content: "";
  position: absolute;
  inset: -60%;
  background:
    radial-gradient(circle at 10% 0, rgba(181,224,255,0.16), transparent 65%),
    radial-gradient(circle at 90% 80%, rgba(47,141,228,0.2), transparent 60%);
  mix-blend-mode: screen;
  opacity: 0;
  transition: opacity 0.18s ease;
}

.bridge-card:hover::after {
  opacity: 1;
}

.bridge-thumb {
  width: 100%;
  height: 80px;
  border-radius: 10px;
  margin-bottom: 6px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border: 1px solid rgba(80,120,170,0.8);
}

.bridge-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.bridge-meta {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.bridge-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  font-size: 0.7rem;
  margin-top: 2px;
}

.bridge-tag {
  border-radius: 999px;
  border: 1px solid rgba(180,194,214,0.4);
  padding: 1px 7px;
  color: var(--muted);
  background: rgba(5,10,20,0.9);
}

.bridge-tag.accent {
  background: rgba(47,141,228,0.2);
  border-color: rgba(149,199,255,0.9);
  color: var(--text);
}

.bridge-list-empty {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 6px;
}

/* ----- RÉSZLETES NÉZET ----- */

.detail-panel {
  min-height: 260px;
}

.detail-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
}

.detail-title {
  font-size: 1.05rem;
}

.detail-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.7rem;
}

.badge {
  border-radius: 999px;
  padding: 3px 8px;
  border: 1px solid rgba(180,194,214,0.4);
  background: rgba(4,9,18,0.9);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.badge.accent {
  background: linear-gradient(135deg, var(--accent), #65a9ff);
  color: #050b16;
  border-color: rgba(255,255,255,0.75);
}

.detail-image-wrapper {
  margin: 8px 0 10px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(53,82,132,0.8);
  background: radial-gradient(circle at top, rgba(68,126,214,0.25), transparent 65%);
}

.detail-image-wrapper img {
  width: 100%;
  display: block;
  max-height: 220px;
  object-fit: cover;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
  margin-top: 6px;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

.detail-grid div label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(180,194,214,0.75);
}

.detail-grid div span {
  font-size: 0.9rem;
  color: var(--text);
}

.detail-note {
  font-size: 0.78rem;
  color: var(--muted);
}

/* ----- KVÍZ ----- */

.quiz-panel {
  margin-top: 6px;
}

.quiz-intro {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.quiz-question {
  margin-bottom: 10px;
  padding: 8px 9px;
  border-radius: 10px;
  background: rgba(6,13,26,0.95);
  border: 1px solid rgba(65,98,151,0.9);
}

.quiz-question-title {
  font-size: 0.87rem;
  margin-bottom: 6px;
}

.quiz-options {
  display: grid;
  gap: 4px;
  font-size: 0.82rem;
}

.quiz-options label {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  cursor: pointer;
  padding: 3px 4px;
  border-radius: 8px;
  transition: background 0.15s ease;
}

.quiz-options input[type="radio"] {
  margin-top: 2px;
  accent-color: var(--accent);
}

.quiz-options label:hover {
  background: rgba(47,141,228,0.12);
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 6px;
}

.btn {
  border-radius: 999px;
  border: 1px solid rgba(133,183,255,0.85);
  background: linear-gradient(135deg, var(--accent), #6cb5ff);
  color: #03060c;
  padding: 6px 14px;
  font-size: 0.82rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  box-shadow: 0 12px 30px rgba(0,0,0,0.55);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.7);
}

.btn-secondary {
  border-color: rgba(139,159,194,0.8);
  background: rgba(6,13,24,0.95);
  color: var(--muted);
  box-shadow: none;
}

.btn-secondary:hover {
  background: rgba(16,29,50,0.95);
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.quiz-result {
  font-size: 0.85rem;
  margin-top: 4px;
  color: var(--muted);
}

.quiz-result strong {
  color: var(--text);
}

.quiz-result.good {
  color: var(--success);
}

.quiz-result.bad {
  color: var(--danger);
}

/* ----- LÁBLÉC ----- */

footer {
  font-size: 0.78rem;
  color: var(--muted);
  text-align: center;
  padding: 10px 12px 18px;
}

/* ----- RESZPONZIVITÁS ----- */

@media (max-width: 860px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
  }
  .content-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  nav {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
  }
}