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

:root {
  --sidebar-bg:  #30364F;  /* dark navy sidebar */
  --body-bg:     #F0F0DB;  /* warm cream body */
  --hover-bg:    #252A3E;  /* darker navy for sidebar hover */
  --border:      #C5C5AD;  /* slightly darker than cream */
  --amber:       #E7E7C5;  /* warm cream accent on dark sidebar */
  --text:        #30364F;  /* dark navy for body text */
  --muted:       #ACBAC4;  /* muted blue-grey for nav links on dark bg */
  --icon:        #C5C5AD;  /* dimmed icon color */
}

body {
  background-color: var(--body-bg);
  font-family: 'Raleway', system-ui, sans-serif;
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

nav {
  display: flex;
  flex-direction: column;
  width: 280px;
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--sidebar-bg);
  flex-shrink: 0;
  border-right: 1px solid var(--border);
}

nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.75rem 1rem;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  border-left: 3px solid transparent;
}

nav a:hover,
nav a.active {
  background: var(--hover-bg);
  color: var(--amber);
  border-left-color: var(--amber);
  font-weight: bold;
}

#app {
  padding: 2rem;
  flex: 1;
}

#collapse-btn {
  margin-top: auto;
  background: none;
  border: none;
  color: var(--icon);
  font-size: 1.5rem;
  padding: 0.75rem 1rem;
  cursor: pointer;
  text-align: left;
  transition: color 0.2s;
}

#collapse-btn:hover {
  color: var(--amber);
}

nav.collapsed {
  width: 40px;
}

nav.collapsed a {
  overflow: hidden;
  white-space: nowrap;
  width: 0;
  padding: 0;
  opacity: 0;
}

nav.collapsed #collapse-btn {
  transform: scaleX(-1);
  width: 40px;
  text-align: center;
  padding: 0.75rem 0;
}

nav {
  overflow: hidden;
  transition: width 0.1s;
}

p {
    font-family: "Arvo", system-ui, sans-serif;
    text-align: justify;
}

h1 {
    width: 100%;
    padding: 20px 0 20px 0;
    border-radius: 10px;
    font-size: 48px;
    color: var(--body-bg);
    text-align: center;
    background-color: var(--sidebar-bg);
}

img {
    width: 200px;
    height: 140px;
    border-radius: 10px;
    margin: 0;
    object-fit: cover;
    cursor: pointer;
    outline: 0px solid transparent;
    transition-property: filter, outline, transform;
    transition-duration: 0.15s;
    transition-timing-function: ease-in-out;
    flex-shrink: 0;
}

img:hover {
    outline: 4px solid var(--sidebar-bg);
    transform: translateY(-2px);
}

.colcont {
    display: flex;
    gap: 20px;
    flex-direction: column;
}

.rowcont {
    display: flex;
    gap: 20px;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
}

.rowcont p {
    flex: 1 1 320px;
    min-width: 0;
}

hr {
    width: 100%;
    border: 1px solid var(--border);
}

section {
    padding: 20px;
}

details {
    border: 2px solid var(--border);
    border-radius: 10px;
}

summary {
    font-size: 32px;
    text-align: left;
    width: 100%;
    padding: 20px;
}

.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    cursor: pointer;
}

.lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    width: auto;
    border-radius: 10px;
    cursor: default;
}

.lightbox.hidden {
    display: none;
}

/* ===== Saját details/summary nyíl ===== */
details {
    overflow: hidden;
}

summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: background 0.15s;
    user-select: none;
}

summary::-webkit-details-marker {
    display: none;
}

summary::before {
    content: "▸";
    color: var(--sidebar-bg);
    font-size: 1em;
    transition: transform 0.2s ease;
    display: inline-block;
}

details[open] > summary::before {
    transform: rotate(90deg);
}

summary:hover {
    background: #f7f4e8;
}

/* ===== Lightbox close gomb és súgó ===== */
.lightbox-close {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    background: rgba(0, 0, 0, 0.35);
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    transition: background 0.15s, transform 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.08);
}

.lightbox-hint {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-family: 'Raleway', sans-serif;
    font-size: 0.85rem;
    pointer-events: none;
}

/* ===== Kép-placeholder (hiányzó képekhez) ===== */
.img-placeholder {
    width: 200px;
    height: 140px;
    border-radius: 10px;
    background: repeating-linear-gradient(
        45deg,
        #e8e8d0,
        #e8e8d0 12px,
        #dcdcc2 12px,
        #dcdcc2 24px
    );
    display: flex;
    align-items: center;
    justify-content: center;
    color: #7a7a5e;
    font-family: 'Raleway', sans-serif;
    font-size: 0.85rem;
    flex-shrink: 0;
    border: 1px dashed var(--border);
    font-style: italic;
}

/* ===== Mobil-reszponzivitás ===== */
@media (max-width: 768px) {
    body {
        flex-direction: column;
        min-height: 100vh;
    }

    nav {
        width: 100%;
        height: auto;
        position: sticky;
        top: 0;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        padding: 0.5rem 0.75rem;
        border-right: none;
        border-bottom: 1px solid var(--border);
        z-index: 100;
        gap: 0;
        overflow: visible;
    }

    nav::before {
        content: "🚂 Vasút Múzeum";
        font-family: 'Arvo', serif;
        color: var(--amber);
        font-size: 1.05rem;
        font-weight: bold;
        margin-right: auto;
        padding: 0.25rem 0.5rem;
    }

    nav a {
        width: 100%;
        padding: 0.85rem 1rem;
        border-left: 3px solid transparent;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    nav.collapsed {
        width: 100%;
    }

    nav.collapsed a {
        display: none;
    }

    nav:not(.collapsed) {
        max-height: 100vh;
        overflow-y: auto;
    }

    #collapse-btn {
        margin-top: 0;
        padding: 0.3rem 0.75rem;
        font-size: 0;
        width: auto;
        height: auto;
    }

    #collapse-btn::before {
        content: "☰";
        font-size: 1.6rem;
        color: var(--icon);
    }

    nav:not(.collapsed) #collapse-btn::before {
        content: "✕";
    }

    nav.collapsed #collapse-btn {
        transform: none;
        width: auto;
        padding: 0.3rem 0.75rem;
        text-align: center;
    }

    #app {
        padding: 1rem;
    }

    h1 {
        font-size: 1.8rem;
        padding: 14px 8px;
    }

    summary {
        font-size: 1.25rem;
        padding: 1rem;
    }

    section {
        padding: 0.75rem;
    }

    .rowcont {
        flex-direction: column;
    }

    .rowcont img,
    .img-placeholder {
        width: 100%;
        max-width: 100%;
        height: auto;
        max-height: 260px;
        aspect-ratio: 16 / 10;
    }

    .rowcont p {
        flex: 1 1 auto;
    }

    /* Home oldal reszponzivitás */
    .home-grid,
    .facts-grid,
    .highlights {
        grid-template-columns: 1fr !important;
    }

    .hero-content {
        padding: 1.5rem !important;
    }

    .hero-content h1 {
        font-size: 1.8rem !important;
    }

    .lightbox-close {
        top: 0.75rem;
        right: 0.75rem;
    }

    .lightbox-hint {
        font-size: 0.75rem;
        padding: 0 1rem;
        text-align: center;
    }
}

/* Nagyobb tabletek: 2 oszlop a home-on elég */
@media (max-width: 960px) and (min-width: 769px) {
    .facts-grid,
    .highlights {
        grid-template-columns: 1fr 1fr !important;
    }
}