/* ==========================================================================
   Diamond Elite — Landing Page Styles
   Sections: reset -> tokens -> layout/utilities -> header -> hero -> stats
   -> about -> products -> process -> testimonials -> faq -> form -> footer
   -> animations -> media queries
   ========================================================================== */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body { overflow-x: hidden; }
body, h1, h2, h3, h4, p, ul, figure { margin: 0; padding: 0; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ---- Design tokens ---- */
:root {
  --color-bg: #FDFBF9;
  --color-bg-alt: #F7EFEA;
  --color-rose-gold: #B76E79;
  --color-rose-gold-light: #E8B4B8;
  --color-rose-gold-dark: #9A5661;
  --color-gold-foil: #D4AF37;
  --color-text: #2B2320;
  --color-text-muted: #6B5D58;
  --color-white: #FFFFFF;

  --font-display: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
  --font-body: 'Jost', 'Montserrat', -apple-system, sans-serif;
  --fs-h1: clamp(2.25rem, 5vw, 4rem);
  --fs-h2: clamp(1.75rem, 3.5vw, 2.75rem);
  --fs-h3: clamp(1.25rem, 2vw, 1.5rem);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --radius: 12px;
  --radius-lg: 24px;
  --shadow-soft: 0 10px 30px rgba(183, 110, 121, 0.15);
  --shadow-strong: 0 20px 50px rgba(43, 35, 32, 0.18);
  --transition: 0.35s cubic-bezier(.22,1,.36,1);
  --header-h: 76px;
}

/* ---- Base / layout utilities ---- */
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.section { padding: var(--space-6) 0; scroll-margin-top: var(--header-h); }
.section-alt { background: var(--color-bg-alt); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto var(--space-5); }
.section-head .eyebrow {
  display: inline-block; color: var(--color-rose-gold-dark); font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase; font-size: 0.8rem; margin-bottom: var(--space-1);
}
.section-head p { color: var(--color-text-muted); margin-top: var(--space-2); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.9rem 1.9rem; border-radius: 999px; font-weight: 600; font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-rose-gold), var(--color-rose-gold-dark));
  color: var(--color-white); box-shadow: var(--shadow-soft);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-strong); }
.btn-outline {
  border: 1.5px solid var(--color-rose-gold); color: var(--color-rose-gold-dark); background: transparent;
}
.btn-outline:hover { background: var(--color-rose-gold-light); color: var(--color-white); }
.btn:disabled { opacity: 0.65; cursor: not-allowed; transform: none; }

/* scroll-reveal */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---- Header ---- */
/* Note: backdrop-filter lives on ::before, not .site-header itself — putting it
   directly on .site-header would make it the containing block for any
   position:fixed descendant (e.g. the mobile nav-links panel), breaking its
   full-viewport positioning. */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  display: flex; align-items: center;
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.site-header::before {
  content: ''; position: absolute; inset: 0; z-index: -1;
  background: rgba(253, 251, 249, 0.85);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.site-header.is-scrolled { box-shadow: 0 4px 20px rgba(43,35,32,0.08); border-color: rgba(183,110,121,0.15); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; }

.logo { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; color: var(--color-text); }
.logo span { color: var(--color-rose-gold); }

.nav-links { display: flex; align-items: center; gap: var(--space-4); }
.nav-links a {
  font-size: 0.92rem; font-weight: 500; color: var(--color-text-muted);
  position: relative; padding: 0.25rem 0; transition: color var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px;
  background: var(--color-rose-gold); transition: width var(--transition);
}
.nav-links a:hover { color: var(--color-text); }
.nav-links a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: var(--space-3); }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; padding: 0.5rem; z-index: 110;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--color-text); transition: var(--transition); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Hero ---- */
.hero { padding: var(--space-6) 0; overflow: hidden; }
.hero .container { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: var(--space-5); align-items: center; }
.hero-eyebrow {
  display: inline-block; color: var(--color-rose-gold-dark); font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase; font-size: 0.8rem; margin-bottom: var(--space-2);
}
.hero h1 { margin-bottom: var(--space-3); }
.hero h1 em { color: var(--color-rose-gold); font-style: normal; }
.hero p { color: var(--color-text-muted); font-size: 1.08rem; max-width: 480px; margin-bottom: var(--space-4); }
.hero-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.hero-visual { position: relative; }
.hero-visual .frame {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-strong); aspect-ratio: 4/5;
  background: linear-gradient(135deg, var(--color-rose-gold-light), var(--color-rose-gold));
}
.hero-visual .frame::after {
  content: ''; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(160deg, rgba(183,110,121,0.25), rgba(212,175,55,0.05) 60%);
}
.hero-visual .frame img { position: relative; z-index: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-visual .badge {
  position: absolute; bottom: -1.25rem; left: -1.25rem; background: var(--color-white);
  padding: 1rem 1.4rem; border-radius: var(--radius); box-shadow: var(--shadow-strong);
  display: flex; align-items: center; gap: 0.75rem;
}
.hero-visual .badge strong { display: block; font-family: var(--font-display); font-size: 1.3rem; color: var(--color-rose-gold-dark); }
.hero-visual .badge span { font-size: 0.78rem; color: var(--color-text-muted); }

/* ---- Stats ---- */
.stats { background: linear-gradient(135deg, var(--color-rose-gold-dark), var(--color-rose-gold)); color: var(--color-white); padding: var(--space-5) 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); text-align: center; }
.stat-num { font-family: var(--font-display); font-size: clamp(2rem, 4vw, 2.75rem); font-weight: 700; }
.stat-label { font-size: 0.85rem; opacity: 0.9; margin-top: 0.25rem; }

/* ---- About ---- */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: center; }
.about-copy p { color: var(--color-text-muted); margin-bottom: var(--space-3); }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); margin-top: var(--space-4); }
.feature-item { display: flex; gap: 0.75rem; align-items: flex-start; }
.feature-item .icon {
  flex-shrink: 0; width: 42px; height: 42px; border-radius: 50%;
  background: var(--color-rose-gold-light); display: flex; align-items: center; justify-content: center;
  color: var(--color-white);
}
.feature-item strong { display: block; font-size: 0.95rem; margin-bottom: 0.2rem; }
.feature-item span { font-size: 0.85rem; color: var(--color-text-muted); }
.about-visual { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-soft); background: linear-gradient(135deg, var(--color-rose-gold-light), var(--color-rose-gold)); }
.about-visual img { display: block; width: 100%; aspect-ratio: 1/1; object-fit: cover; }

/* ---- Products ---- */
.filter-tabs { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.6rem; margin-bottom: var(--space-4); }
.filter-tab {
  padding: 0.55rem 1.3rem; border-radius: 999px; border: 1.5px solid rgba(183,110,121,0.3);
  font-size: 0.88rem; font-weight: 500; color: var(--color-text-muted); transition: var(--transition);
}
.filter-tab:hover { border-color: var(--color-rose-gold); color: var(--color-text); }
.filter-tab[aria-selected="true"] {
  background: var(--color-rose-gold); border-color: var(--color-rose-gold); color: var(--color-white);
}

.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); }
.product-card {
  background: var(--color-white); border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 6px 18px rgba(43,35,32,0.06); transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-strong); }
.product-card.is-hidden { display: none; }
.product-thumb { position: relative; aspect-ratio: 1/1; background: linear-gradient(135deg, var(--color-rose-gold-light), var(--color-rose-gold)); overflow: hidden; }
.product-thumb img { position: relative; z-index: 1; width: 100%; height: 100%; object-fit: cover; cursor: zoom-in; transition: transform 0.5s ease; }
.product-card:hover .product-thumb img { transform: scale(1.06); }
.product-thumb .fallback-icon { position: absolute; inset: 0; z-index: 0; display: none; align-items: center; justify-content: center; color: rgba(255,255,255,0.85); }
.product-thumb.is-img-error .fallback-icon { display: flex; }
.product-body { padding: var(--space-2) var(--space-3) var(--space-3); }
.product-tag { display: inline-block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-rose-gold-dark); font-weight: 600; margin-bottom: 0.3rem; }
.product-body h3 { margin-bottom: 0.3rem; }
.product-body p { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: var(--space-2); }
.product-link { font-size: 0.85rem; font-weight: 600; color: var(--color-rose-gold-dark); }
.product-link:hover { text-decoration: underline; }

/* ---- Process ---- */
.process-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--space-3); position: relative; }
.process-steps::before {
  content: ''; position: absolute; top: 26px; left: 10%; right: 10%; height: 2px;
  background: repeating-linear-gradient(90deg, var(--color-rose-gold-light) 0 8px, transparent 8px 16px);
}
.process-step { position: relative; text-align: center; }
.process-num {
  width: 52px; height: 52px; margin: 0 auto var(--space-2); border-radius: 50%;
  background: var(--color-white); border: 2px solid var(--color-rose-gold); color: var(--color-rose-gold-dark);
  display: flex; align-items: center; justify-content: center; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem;
  position: relative; z-index: 1;
}
.process-step h3 { font-size: 1.02rem; margin-bottom: 0.3rem; }
.process-step p { font-size: 0.82rem; color: var(--color-text-muted); }

/* ---- Testimonials ---- */
.testimonial-slider { position: relative; max-width: 720px; margin: 0 auto; }
.testimonial-track { overflow: hidden; }
.testimonial-slides { display: flex; transition: transform 0.5s cubic-bezier(.22,1,.36,1); }
.testimonial-slide { flex: 0 0 100%; padding: 0 var(--space-2); text-align: center; }
.testimonial-quote { font-family: var(--font-display); font-size: 1.35rem; color: var(--color-text); margin-bottom: var(--space-3); }
.testimonial-author { display: flex; align-items: center; justify-content: center; gap: 0.75rem; }
.avatar-initials {
  width: 44px; height: 44px; border-radius: 50%; background: var(--color-rose-gold);
  color: var(--color-white); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.9rem;
}
.testimonial-author strong { display: block; font-size: 0.92rem; }
.testimonial-author span { font-size: 0.8rem; color: var(--color-text-muted); }
.slider-controls { display: flex; align-items: center; justify-content: center; gap: var(--space-3); margin-top: var(--space-4); }
.slider-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1.5px solid rgba(183,110,121,0.3);
  display: flex; align-items: center; justify-content: center; transition: var(--transition); color: var(--color-rose-gold-dark);
}
.slider-btn:hover { background: var(--color-rose-gold); color: var(--color-white); border-color: var(--color-rose-gold); }
.slider-dots { display: flex; gap: 0.5rem; }
.slider-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(183,110,121,0.3); transition: var(--transition); }
.slider-dot[aria-selected="true"] { background: var(--color-rose-gold); width: 22px; border-radius: 999px; }

/* ---- FAQ ---- */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid rgba(183,110,121,0.2); }
.faq-item summary {
  list-style: none; cursor: pointer; padding: var(--space-3) 0; font-weight: 600;
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-2);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .plus { flex-shrink: 0; font-size: 1.3rem; color: var(--color-rose-gold); transition: transform var(--transition); }
.faq-item[open] summary .plus { transform: rotate(45deg); }
.faq-item p { padding: 0 0 var(--space-3); color: var(--color-text-muted); font-size: 0.92rem; }

/* ---- Registration form ---- */
.form-section {
  background: linear-gradient(135deg, var(--color-rose-gold-light) 0%, var(--color-bg-alt) 55%);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-4);
}
.form-wrap { max-width: 640px; margin: 0 auto; }
.reg-form { background: var(--color-white); border-radius: var(--radius); padding: var(--space-4); box-shadow: var(--shadow-strong); display: grid; gap: var(--space-3); }
.form-row { display: grid; gap: 0.4rem; }
.form-row label { font-size: 0.85rem; font-weight: 600; }
.form-row .required { color: var(--color-rose-gold-dark); }
.form-row input, .form-row select, .form-row textarea {
  font: inherit; padding: 0.75rem 1rem; border-radius: 8px; border: 1.5px solid rgba(43,35,32,0.15);
  background: var(--color-bg); color: var(--color-text); transition: border-color var(--transition);
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: var(--color-rose-gold);
}
.form-row.has-error input, .form-row.has-error select, .form-row.has-error textarea { border-color: #C0392B; }
.form-error { font-size: 0.78rem; color: #C0392B; min-height: 1em; }
.reg-form textarea { resize: vertical; min-height: 90px; }
.form-submit { display: flex; align-items: center; gap: var(--space-2); }
.form-banner {
  display: none; padding: 0.85rem 1rem; border-radius: 8px; font-size: 0.9rem; font-weight: 500;
}
.form-banner.is-visible { display: block; }
.form-banner.success { background: #E4F4E9; color: #1E7A3D; }
.form-banner.error { background: #FBE7E4; color: #B23A25; }
.spinner {
  display: none; width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.5); border-top-color: var(--color-white); animation: spin 0.7s linear infinite;
}
.btn-primary.is-loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Footer ---- */
.site-footer { background: var(--color-text); color: rgba(255,255,255,0.85); padding: var(--space-5) 0 var(--space-3); }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: var(--space-4); margin-bottom: var(--space-4); }
.site-footer .logo { color: var(--color-white); }
.footer-tagline { font-size: 0.88rem; color: rgba(255,255,255,0.6); margin-top: var(--space-2); max-width: 280px; }
.footer-col h4 { font-size: 0.92rem; margin-bottom: var(--space-2); color: var(--color-white); }
.footer-col ul { display: grid; gap: 0.6rem; }
.footer-col a, .footer-col li { font-size: 0.88rem; color: rgba(255,255,255,0.65); }
.footer-col a:hover { color: var(--color-rose-gold-light); }
.social-links { display: flex; gap: 0.6rem; margin-top: var(--space-3); }
.social-links a {
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid rgba(255,255,255,0.25);
  display: flex; align-items: center; justify-content: center; transition: var(--transition);
}
.social-links a:hover { background: var(--color-rose-gold); border-color: var(--color-rose-gold); }
.map-placeholder {
  border-radius: var(--radius); overflow: hidden; height: 160px; background: rgba(255,255,255,0.06);
  display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); font-size: 0.85rem;
  border: 1px dashed rgba(255,255,255,0.2);
}
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-top: var(--space-3); text-align: center; font-size: 0.8rem; color: rgba(255,255,255,0.5); }

/* ---- Lightbox ---- */
.lightbox {
  position: fixed; inset: 0; z-index: 200; display: none; align-items: center; justify-content: center;
  background: rgba(20, 15, 14, 0.85); padding: var(--space-3);
}
.lightbox.is-open { display: flex; }
.lightbox-content { position: relative; max-width: 720px; width: 100%; }
.lightbox-content img { border-radius: var(--radius); width: 100%; max-height: 80vh; object-fit: contain; background: var(--color-white); }
.lightbox-close {
  position: absolute; top: -44px; right: 0; color: var(--color-white); font-size: 1.6rem;
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
}

/* ---- Responsive ---- */
@media (max-width: 1023px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
    background: var(--color-bg); flex-direction: column; justify-content: flex-start;
    padding: var(--space-4) var(--space-3); gap: var(--space-3);
    transform: translateX(100%); transition: transform var(--transition);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links a { font-size: 1.05rem; }
  .header-actions .btn-primary { display: none; }
  .nav-links .btn-primary { display: inline-flex; margin-top: var(--space-2); }

  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .about { grid-template-columns: 1fr; }
  .about-visual { order: -1; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
  .process-steps::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .section { padding: var(--space-5) 0; }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-visual .badge { left: 0.5rem; bottom: -1rem; padding: 0.75rem 1rem; }
}