/**
 * Hồng Gia Tuệ Apartment - Main Stylesheet
 */

:root {
    --color-primary: #1a1a2e;
    --color-secondary: #16213e;
    --color-accent: #c9a962;
    --color-accent-light: #e8d5a3;
    --color-white: #ffffff;
    --color-cream: #faf8f5;
    --color-gray: #6b7280;
    --color-success: #10b981;
    --color-error: #ef4444;
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Montserrat', -apple-system, sans-serif;
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 25px 60px rgba(0, 0, 0, 0.15);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); color: var(--color-primary); background: var(--color-cream); line-height: 1.7; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
ul, ol { list-style: none; }

.container { max-width: 1400px; margin: 0 auto; padding: 0 2rem; }
.text-center { text-align: center; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.8rem; padding: 1rem 2.5rem; font-family: var(--font-body); font-size: 0.85rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; border: none; cursor: pointer; transition: var(--transition); }
.btn-primary { background: var(--color-accent); color: var(--color-primary); }
.btn-primary:hover { background: var(--color-accent-light); transform: translateY(-3px); box-shadow: 0 15px 35px rgba(201, 169, 98, 0.3); }
.btn-secondary { background: transparent; color: var(--color-white); border: 1px solid rgba(255, 255, 255, 0.3); }
.btn-secondary:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* HEADER */
header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; transition: var(--transition); }
header.scrolled { background: rgba(26, 26, 46, 0.98); backdrop-filter: blur(20px); box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1); }
.header-container { max-width: 1400px; margin: 0 auto; padding: 1.2rem 2rem; display: flex; justify-content: space-between; align-items: center; }

.logo { display: flex; align-items: center; gap: 1rem; }
.logo-img { height: 50px; width: auto; }
.logo-img-footer { height: 80px; width: auto; margin-bottom: 1rem; }
.logo-icon { width: 45px; height: 45px; border: 2px solid var(--color-accent); display: flex; align-items: center; justify-content: center; font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; color: var(--color-accent); }
.logo-text { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; color: var(--color-white); letter-spacing: 0.05em; }
.logo-text span { display: block; font-size: 0.65rem; font-family: var(--font-body); font-weight: 400; letter-spacing: 0.2em; color: var(--color-accent); text-transform: uppercase; }

#nav-menu ul { display: flex; gap: 2.5rem; }
#nav-menu a { color: var(--color-white); font-size: 0.8rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; position: relative; padding: 0.5rem 0; }
#nav-menu a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 1px; background: var(--color-accent); transition: var(--transition); }
#nav-menu a:hover::after, #nav-menu a.active::after { width: 100%; }
#nav-menu a:hover, #nav-menu a.active { color: var(--color-accent); }

.nav-cta { background: transparent; border: 1px solid var(--color-accent); padding: 0.7rem 1.5rem; color: var(--color-accent); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; }
.nav-cta:hover { background: var(--color-accent); color: var(--color-primary); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 10px; }
.menu-toggle span { width: 25px; height: 2px; background: var(--color-white); transition: var(--transition); }

.mobile-menu { position: fixed; top: 0; right: -100%; width: 80%; max-width: 350px; height: 100vh; background: var(--color-primary); padding: 5rem 2rem; transition: var(--transition); z-index: 999; }
.mobile-menu.active { right: 0; }
.mobile-menu ul { display: flex; flex-direction: column; gap: 1.5rem; }
.mobile-menu a { color: var(--color-white); font-size: 1.1rem; display: block; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1); }

/* HERO */
.hero { height: 100vh; min-height: 650px; position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%); }
.hero-pattern { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-image: radial-gradient(circle at 20% 80%, rgba(201, 169, 98, 0.1) 0%, transparent 50%), radial-gradient(circle at 80% 20%, rgba(201, 169, 98, 0.08) 0%, transparent 50%); }
.hero-content { position: relative; z-index: 10; text-align: center; max-width: 850px; padding: 0 2rem; }
.hero-subtitle { font-size: 0.85rem; font-weight: 400; letter-spacing: 0.4em; text-transform: uppercase; color: var(--color-accent); margin-bottom: 1.5rem; animation: fadeInUp 1s ease forwards 0.3s; opacity: 0; }
.hero-title { font-family: var(--font-display); font-size: clamp(2.5rem, 7vw, 5rem); font-weight: 400; color: var(--color-white); line-height: 1.15; margin-bottom: 1.5rem; animation: fadeInUp 1s ease forwards 0.5s; opacity: 0; }
.hero-title em { font-style: italic; color: var(--color-accent); white-space: nowrap; }
.hero-description { font-size: 1rem; color: rgba(255, 255, 255, 0.7); max-width: 550px; margin: 0 auto 2.5rem; animation: fadeInUp 1s ease forwards 0.7s; opacity: 0; }
.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; animation: fadeInUp 1s ease forwards 0.9s; opacity: 0; }
.hero-scroll { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 0.8rem; color: var(--color-white); }
.hero-scroll span { font-size: 0.65rem; letter-spacing: 0.2em; text-transform: uppercase; }
.scroll-line { width: 1px; height: 50px; background: linear-gradient(to bottom, var(--color-accent), transparent); animation: scrollPulse 2s ease-in-out infinite; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scrollPulse { 0%, 100% { transform: scaleY(1); opacity: 1; } 50% { transform: scaleY(0.5); opacity: 0.5; } }

/* SECTIONS */
section { padding: 6rem 0; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-label { font-size: 0.75rem; font-weight: 500; letter-spacing: 0.3em; text-transform: uppercase; color: var(--color-accent); margin-bottom: 1rem; }
.section-title { font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3rem); font-weight: 400; color: var(--color-primary); line-height: 1.2; }
.section-title em { font-style: italic; color: var(--color-accent); }

/* ABOUT */
.about { background: var(--color-cream); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about-image { position: relative; }
.about-image-main { width: 100%; height: 500px; background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)); display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.about-image-main img { width: 100%; height: 100%; object-fit: cover; }
.about-image-placeholder { font-size: 6rem; opacity: 0.3; position: absolute; }
.about-image-frame { position: absolute; top: 1.5rem; left: 1.5rem; right: -1.5rem; bottom: -1.5rem; border: 1px solid var(--color-accent); pointer-events: none; }
.about-stats { position: absolute; bottom: -2rem; right: -2rem; background: var(--color-white); padding: 1.5rem 2rem; box-shadow: var(--shadow); }
.stat-number { font-family: var(--font-display); font-size: 2.5rem; font-weight: 600; color: var(--color-accent); }
.stat-label { font-size: 0.75rem; color: var(--color-gray); letter-spacing: 0.1em; text-transform: uppercase; }
.about-content h3 { font-family: var(--font-display); font-size: 2rem; font-weight: 400; margin-bottom: 1.5rem; }
.about-content p { color: var(--color-gray); margin-bottom: 1rem; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2rem; }
.feature-item { display: flex; align-items: flex-start; gap: 1rem; }
.feature-icon { width: 45px; height: 45px; background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light)); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.feature-text h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.2rem; }
.feature-text p { font-size: 0.8rem; color: var(--color-gray); margin: 0; }

/* PROPERTIES */
.properties { background: var(--color-primary); position: relative; }
.properties::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: radial-gradient(circle at 10% 90%, rgba(201, 169, 98, 0.1) 0%, transparent 40%), radial-gradient(circle at 90% 10%, rgba(201, 169, 98, 0.08) 0%, transparent 40%); }
.properties .section-title { color: var(--color-white); }
.properties-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; position: relative; z-index: 1; }
.property-card { background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.08); transition: var(--transition); overflow: hidden; }
.property-card:hover { background: rgba(255, 255, 255, 0.06); border-color: rgba(201, 169, 98, 0.3); transform: translateY(-8px); }
.property-image { height: 280px; background: linear-gradient(135deg, var(--color-secondary), #0f0f23); display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.property-image img { width: 100%; height: 100%; object-fit: cover; }
.property-image-placeholder { font-size: 5rem; opacity: 0.2; position: absolute; }
.property-badge { position: absolute; top: 1rem; left: 1rem; background: var(--color-accent); color: var(--color-primary); padding: 0.4rem 0.8rem; font-size: 0.65rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; }
.property-rating { position: absolute; top: 1rem; right: 1rem; background: rgba(255, 255, 255, 0.15); backdrop-filter: blur(10px); color: var(--color-white); padding: 0.4rem 0.8rem; font-size: 0.85rem; font-weight: 600; display: flex; align-items: center; gap: 0.4rem; }
.property-rating svg { width: 14px; height: 14px; fill: var(--color-accent); }
.property-content { padding: 2rem; }
.property-location { font-size: 0.75rem; color: var(--color-accent); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.4rem; }
.property-location svg { width: 12px; height: 12px; fill: var(--color-accent); }
.property-name { font-family: var(--font-display); font-size: 1.5rem; color: var(--color-white); margin-bottom: 0.8rem; }
.property-description { font-size: 0.9rem; color: rgba(255, 255, 255, 0.6); margin-bottom: 1.5rem; line-height: 1.6; }
.property-amenities { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-bottom: 1.5rem; }
.amenity { display: flex; align-items: center; gap: 0.4rem; font-size: 0.75rem; color: rgba(255, 255, 255, 0.5); }
.amenity svg { width: 14px; height: 14px; fill: var(--color-accent); }
.property-cta { display: flex; gap: 0.8rem; }
.property-btn { flex: 1; padding: 0.8rem 1rem; text-align: center; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; }
.property-btn-primary { background: var(--color-accent); color: var(--color-primary); }
.property-btn-primary:hover { background: var(--color-accent-light); }
.property-btn-secondary { background: transparent; border: 1px solid rgba(255, 255, 255, 0.2); color: var(--color-white); }
.property-btn-secondary:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* SERVICES */
.services { background: var(--color-cream); }
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.service-card { background: var(--color-white); padding: 2.5rem 1.5rem; text-align: center; transition: var(--transition); border: 1px solid transparent; }
.service-card:hover { border-color: var(--color-accent); transform: translateY(-8px); box-shadow: var(--shadow); }
.service-icon { width: 70px; height: 70px; background: linear-gradient(135deg, rgba(201, 169, 98, 0.1), rgba(201, 169, 98, 0.05)); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 1.2rem; font-size: 1.8rem; transition: var(--transition); }
.service-card:hover .service-icon { background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light)); }
.service-title { font-family: var(--font-display); font-size: 1.3rem; margin-bottom: 0.8rem; }
.service-description { font-size: 0.85rem; color: var(--color-gray); }

/* GALLERY PREVIEW */
.gallery-preview, .videos-preview { background: var(--color-cream); }
.gallery-grid-preview { display: grid; grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(2, 200px); gap: 1rem; }
.gallery-item { background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)); position: relative; overflow: hidden; cursor: pointer; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.gallery-item:hover img { transform: scale(1.1); }
.gallery-item-large { grid-column: span 2; grid-row: span 2; }
.gallery-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 3rem; opacity: 0.2; }
.gallery-item-large .gallery-placeholder { font-size: 5rem; }
.gallery-overlay { position: absolute; bottom: 0; left: 0; width: 100%; padding: 1.5rem; background: linear-gradient(to top, rgba(26, 26, 46, 0.9), transparent); transform: translateY(100%); transition: var(--transition); }
.gallery-item:hover .gallery-overlay { transform: translateY(0); }
.gallery-title { font-family: var(--font-display); font-size: 1.1rem; color: var(--color-white); }

/* VIDEOS PREVIEW */
.videos-grid-preview { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.video-card { background: var(--color-white); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.video-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.video-thumbnail { height: 200px; background: var(--color-primary); position: relative; cursor: pointer; overflow: hidden; }
.video-thumbnail img { width: 100%; height: 100%; object-fit: cover; }
.video-play-btn { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 60px; height: 60px; background: var(--color-accent); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--color-primary); transition: var(--transition); }
.video-thumbnail:hover .video-play-btn { transform: translate(-50%, -50%) scale(1.1); background: var(--color-accent-light); }
.video-info { padding: 1.5rem; }
.video-rating { margin-bottom: 0.5rem; }
.video-rating .star { color: #ddd; font-size: 0.9rem; }
.video-rating .star.filled { color: var(--color-accent); }
.video-customer { font-weight: 600; margin-bottom: 0.2rem; }
.video-country { font-size: 0.8rem; color: var(--color-gray); margin-bottom: 0.8rem; }
.video-text { font-size: 0.85rem; color: var(--color-gray); font-style: italic; }

/* CTA SECTION */
.cta-section { background: linear-gradient(135deg, var(--color-secondary), var(--color-primary)); padding: 5rem 0; }
.cta-content { text-align: center; max-width: 600px; margin: 0 auto; }
.cta-content h2 { font-family: var(--font-display); font-size: 2.5rem; color: var(--color-white); margin-bottom: 1rem; }
.cta-content p { color: rgba(255, 255, 255, 0.7); margin-bottom: 2rem; }
.cta-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* PAGE HEADER */
.page-header { background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)); padding: 10rem 0 5rem; text-align: center; }
.page-title { font-family: var(--font-display); font-size: clamp(2rem, 5vw, 3.5rem); color: var(--color-white); margin-bottom: 1rem; }
.page-title em { font-style: italic; color: var(--color-accent); }
.page-description { color: rgba(255, 255, 255, 0.7); max-width: 500px; margin: 0 auto; }

/* FILTERS */
.gallery-filter, .video-filter { background: var(--color-white); padding: 1.5rem 0; border-bottom: 1px solid #eee; }
.filter-tabs { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.filter-tab { padding: 0.6rem 1.5rem; font-size: 0.8rem; font-weight: 500; letter-spacing: 0.05em; color: var(--color-gray); border: 1px solid #eee; transition: var(--transition); }
.filter-tab:hover, .filter-tab.active { background: var(--color-accent); color: var(--color-primary); border-color: var(--color-accent); }

/* NO CONTENT */
.no-content { text-align: center; padding: 4rem 2rem; }
.no-content-icon { font-size: 4rem; margin-bottom: 1rem; opacity: 0.3; }
.no-content h3 { font-family: var(--font-display); font-size: 1.5rem; margin-bottom: 0.5rem; }
.no-content p { color: var(--color-gray); }
.no-videos { text-align: center; padding: 3rem; color: var(--color-gray); }

/* CONTACT */
.contact-page { padding: 4rem 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 4rem; }
.contact-info h3 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 1rem; }
.contact-info > p { color: var(--color-gray); margin-bottom: 2rem; }
.contact-details { display: flex; flex-direction: column; gap: 2rem; }
.contact-property h4 { font-size: 1.1rem; margin-bottom: 0.8rem; }
.contact-item { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 0.5rem; font-size: 0.9rem; }
.contact-icon { font-size: 1.1rem; }
.contact-item a:hover { color: var(--color-accent); }
.contact-form-wrapper { background: var(--color-white); padding: 2.5rem; box-shadow: var(--shadow); }
.contact-form h3 { font-family: var(--font-display); font-size: 1.5rem; margin-bottom: 1.5rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { margin-bottom: 1.2rem; }
.form-label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 0.4rem; }
.form-input { width: 100%; padding: 0.9rem 1rem; font-family: var(--font-body); font-size: 0.95rem; border: 1px solid #ddd; background: var(--color-cream); transition: var(--transition); }
.form-input:focus { outline: none; border-color: var(--color-accent); background: white; }
textarea.form-input { resize: vertical; min-height: 120px; }
.form-submit { width: 100%; padding: 1rem; background: var(--color-accent); color: var(--color-primary); font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 0.8rem; transition: var(--transition); }
.form-submit:hover { background: var(--color-primary); color: var(--color-accent); }
.alert { padding: 1.5rem; margin-bottom: 2rem; display: flex; align-items: flex-start; gap: 1rem; }
.alert-success { background: #ecfdf5; border: 1px solid var(--color-success); }
.alert-error { background: #fef2f2; border: 1px solid var(--color-error); color: var(--color-error); }

/* FOOTER */
footer { background: var(--color-primary); padding: 4rem 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; padding-bottom: 3rem; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.footer-brand .logo { margin-bottom: 1.2rem; }
.footer-brand p { font-size: 0.9rem; color: rgba(255, 255, 255, 0.6); margin-bottom: 1.5rem; max-width: 280px; }
.footer-social { display: flex; gap: 0.8rem; }
.social-link { width: 40px; height: 40px; border: 1px solid rgba(255, 255, 255, 0.2); display: flex; align-items: center; justify-content: center; color: var(--color-white); }
.social-link:hover { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-primary); }
.footer-column h4 { font-family: var(--font-display); font-size: 1.2rem; color: var(--color-white); margin-bottom: 1.2rem; }
.footer-links li { margin-bottom: 0.6rem; }
.footer-links a { color: rgba(255, 255, 255, 0.6); font-size: 0.85rem; }
.footer-links a:hover { color: var(--color-accent); }
.footer-bottom { padding: 1.5rem 0; display: flex; justify-content: space-between; align-items: center; }
.footer-copyright { font-size: 0.8rem; color: rgba(255, 255, 255, 0.4); }
.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a { font-size: 0.8rem; color: rgba(255, 255, 255, 0.4); }
.footer-legal a:hover { color: var(--color-accent); }

/* BACK TO TOP */
#back-to-top { position: fixed; bottom: 2rem; right: 2rem; width: 50px; height: 50px; background: var(--color-accent); border: none; cursor: pointer; display: none; align-items: center; justify-content: center; z-index: 999; transition: var(--transition); }
#back-to-top.visible { display: flex; }
#back-to-top:hover { background: var(--color-primary); }
#back-to-top:hover svg { stroke: var(--color-accent); }

/* RESPONSIVE */
@media (max-width: 1200px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 992px) {
    .header-container { padding: 1rem 1.5rem; }
    #nav-menu { display: none; }
    .menu-toggle { display: flex; }
    .about-grid, .properties-grid, .contact-grid { grid-template-columns: 1fr; }
    .about-image-frame { display: none; }
    .about-stats { position: relative; bottom: 0; right: 0; display: inline-block; margin-top: -1.5rem; }
    .videos-grid-preview { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .container { padding: 0 1rem; }
    section { padding: 4rem 0; }
    .hero-buttons { flex-direction: column; }
    .btn { width: 100%; }
    .about-features, .services-grid { grid-template-columns: 1fr; }
    .gallery-grid-preview { grid-template-columns: 1fr 1fr; grid-template-rows: repeat(3, 150px); }
    .gallery-item-large { grid-column: span 2; grid-row: span 1; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .section-title { font-size: 1.8rem; }
    .page-header { padding: 8rem 0 3rem; }
}

/* Utility */
.nowrap { white-space: nowrap; }