/* --- 1. VARIABLES --- */
:root {
    --bristol-blue: #003196; 
    --rich-black: #0c0c0c;
    --overlay-bg: rgba(12, 12, 12, 0.3);
    --font-main: 'Lato', sans-serif;
    --size-top: clamp(0.8rem, 1.2vw, 0.95rem);
    --size-mid: clamp(2.2rem, 7vw, 5rem);
    --size-bottom: clamp(1rem, 1.8vw, 1.1rem);
}

/* --- 2. BASE & NAV --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-main); background-color: var(--rich-black); color: #fff; overflow-x: hidden; }

.navbar { position: fixed; top: 0; width: 100%; z-index: 1000; padding: 15px 0; background: rgba(0, 0, 0, 0.2); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.nav-container { max-width: 1400px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 5%; }
.logo img { height: 32px; }
.nav-links { display: flex; list-style: none; }
.nav-links li:not(:last-child)::after { content: ""; width: 1px; height: 12px; background: rgba(255, 255, 255, 0.1); margin: 0 20px; display: inline-block; }
.nav-links a { color: rgba(255, 255, 255, 0.6); text-decoration: none; font-weight: 700; font-size: 0.75rem; letter-spacing: 0.25em; text-transform: uppercase; transition: 0.3s; }
.nav-links a:hover { color: var(--bristol-blue); text-shadow: 0 0 10px rgba(0, 49, 150, 0.5); }

/* --- 3. HERO --- */
.hero-slideshow { position: relative; width: 100%; height: 100vh; overflow: hidden; }
.slide { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-size: cover; background-position: center; opacity: 0; animation: crossFade 15s infinite; }
.slide-1 { background-image: linear-gradient(to right, rgba(0,0,0,0.6), transparent), url('images/a.webp'); animation-delay: 0s; }
.slide-2 { background-image: linear-gradient(to right, rgba(0,0,0,0.6), transparent), url('images/b.webp'); animation-delay: 5s; }
.slide-3 { background-image: linear-gradient(to right, rgba(0,0,0,0.6), transparent), url('images/c.webp'); animation-delay: 10s; }
@keyframes crossFade { 0% { opacity: 0; } 10% { opacity: 1; } 33% { opacity: 1; } 43% { opacity: 0; } 100% { opacity: 0; } }

.hero-overlay-content { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 10; display: flex; align-items: center; padding: 0 5%; }
.top-line { font-size: var(--size-top); letter-spacing: 0.5em; color: var(--bristol-blue); margin-bottom: 12px; text-shadow: 0 0 12px rgba(255, 255, 255, 0.4); text-transform: uppercase; }
.mid-line { font-size: var(--size-mid); font-weight: 900; line-height: 1; margin-bottom: 20px; }
.bottom-line { font-size: var(--size-bottom); letter-spacing: 0.25em; font-weight: 300; margin-bottom: 50px; color: rgba(255, 255, 255, 0.7); }

/* --- 4. TOURS GRID --- */
.tours-section { padding: 120px 5%; background: var(--rich-black); }
.mid-line-small { font-size: 2.5rem; font-weight: 900; text-transform: uppercase; }
.tours-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; margin-top: 60px; }
.tour-card { position: relative; height: 500px; background-size: cover; background-position: center; display: flex; align-items: flex-end; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.05); transition: 0.4s ease; }
.tour-a { background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('images/a.webp'); }
.tour-b { background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('images/b.webp'); }
.tour-c { background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('images/c.webp'); }
.tour-d { background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('images/d.webp'); }
.tour-card::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: var(--bristol-blue); opacity: 0; mix-blend-mode: overlay; transition: 0.4s; z-index: 1; }
.tour-card:hover::before { opacity: 0.7; }
.tour-card:hover { transform: translateY(-5px); border-color: var(--bristol-blue); }
.tour-content { position: relative; z-index: 2; padding: 40px; }
.tour-number { color: var(--bristol-blue); font-weight: 700; letter-spacing: 0.3em; display: block; margin-bottom: 10px; font-size: 0.8rem; }
.tour-card h4 { font-size: 1.8rem; font-weight: 900; margin-bottom: 15px; }
.tour-card p { font-weight: 300; opacity: 0.8; margin-bottom: 25px; max-width: 350px; }
.tour-cta { font-size: 0.7rem; letter-spacing: 0.2em; font-weight: 700; text-decoration: none; color: #fff; border-bottom: 2px solid var(--bristol-blue); padding-bottom: 5px; }

/* --- 5. AUTHORITY --- */
.authority-section { padding: 100px 5%; background: var(--rich-black); border-top: 1px solid rgba(255, 255, 255, 0.05); }
.authority-container { max-width: 1100px; margin: 0 auto; text-align: center; }
.origin-story { margin: 30px 0 60px; }
.origin-story p { font-size: 1.2rem; line-height: 1.8; font-weight: 300; color: rgba(255, 255, 255, 0.85); }
.origin-story strong { color: var(--bristol-blue); font-weight: 700; }
.standards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-bottom: 60px; border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 60px; text-align: left; }
.standard-item h4 { font-size: 0.8rem; letter-spacing: 0.3em; color: var(--bristol-blue); margin-bottom: 15px; font-weight: 900; }
.standard-item p { font-size: 0.95rem; line-height: 1.6; font-weight: 300; color: rgba(255, 255, 255, 0.6); }
.about-footer { border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 40px; }
.about-footer p { font-size: 1.1rem; font-style: italic; opacity: 0.8; }

/* --- 6. BESPOKE --- */
.bespoke-section { padding: 120px 5%; background: #080808; text-align: center; }
.bespoke-text { font-size: 1.2rem; font-weight: 300; margin: 30px auto 50px; max-width: 600px; opacity: 0.7; }

/* --- 7. BUTTONS & OVERLAY --- */
.cta-button { display: inline-block; background: var(--bristol-blue); color: #fff; text-decoration: none; font-weight: 700; padding: 22px 60px; border-radius: 2px; letter-spacing: 0.25em; text-transform: uppercase; transition: 0.4s; border: none; cursor: pointer; font-size: 0.85rem; box-shadow: 0 10px 30px rgba(0, 49, 150, 0.3); }
.cta-button:hover { background: #0042c7; transform: translateY(-5px); box-shadow: 0 15px 40px rgba(0, 49, 150, 0.5); }

.overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--overlay-bg); z-index: 2000; backdrop-filter: blur(25px); display: none; flex-direction: column; opacity: 0; transition: 0.4s; }
.overlay.active { display: flex; opacity: 1; }
.overlay-header { width: 100%; padding: 20px 5%; display: flex; justify-content: flex-end; }
.close-overlay { background: none; border: none; color: #fff; font-size: 0.8rem; letter-spacing: 0.3em; cursor: pointer; display: flex; align-items: center; font-weight: 700; }
.close-overlay span { font-size: 2.5rem; margin-left: 10px; line-height: 0; }
.overlay-scroll-container { flex-grow: 1; overflow-y: auto; padding: 40px 0 100px; }
.overlay-inner-content { width: 90%; max-width: 1100px; margin: 0 auto; }
.overlay-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 80px; }
.contact-link { display: block; color: #fff; text-decoration: none; font-size: 1.1rem; margin-bottom: 25px; font-weight: 700; }
.whatsapp { color: #25D366 !important; }
input, textarea { width: 100%; padding: 18px; background: rgba(0, 0, 0, 0.6); border: 1px solid rgba(255, 255, 255, 0.1); color: #fff; margin-bottom: 15px; font-family: inherit; }

/* --- 8. FOOTER --- */
.main-footer { padding: 40px 5%; text-align: center; font-size: 0.7rem; letter-spacing: 0.2em; opacity: 0.4; border-top: 1px solid rgba(255,255,255,0.05); }

/* --- 9. MOBILE --- */
.menu-toggle { display: none; flex-direction: column; cursor: pointer; }
.menu-toggle .bar { width: 22px; height: 2px; background: #fff; margin: 3px 0; }

@media (max-width: 992px) {
    .nav-links { position: fixed; left: -100%; top: 0; width: 100%; height: 100vh; background: var(--rich-black); flex-direction: column; justify-content: center; }
    .nav-links.active { left: 0; }
    .nav-links li:not(:last-child)::after { display: none; }
    .menu-toggle { display: flex; }
    .tours-grid, .standards-grid, .overlay-grid { grid-template-columns: 1fr; gap: 40px; }
    .mid-line { font-size: 3rem; }
    .mid-line-small { font-size: 2rem; }
}