/* Stylesheet for Premium Graduation Invitation - Light Sage & Gold Redesign */

/* --- Fonts & Base --- */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,600;1,400&family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Marck+Script&display=swap');

:root {
  --color-cream-bg: #faf9f6;
  --color-sage-light: #f0f4ed;
  --color-sage: #8fa88b;
  --color-sage-dark: #556b2f;
  --color-gold: #9e8144;
  --color-gold-light: #d4af37;
  --color-gold-dark: #7c6441;
  --color-text-dark: #3a332a;
  --color-text-muted: #6e6559;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(158, 129, 68, 0.22);
  --glass-shadow: 0 15px 35px rgba(124, 100, 65, 0.12);
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Montserrat', Helvetica, Arial, sans-serif;
  --font-accent: 'Marck Script', cursive;
  --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-cream-bg);
  color: var(--color-text-dark);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.8;
  position: relative;
}

html.no-scroll, body.no-scroll {
  overflow: hidden !important;
  height: 100% !important;
  position: relative;
}

/* Background image overlay - Bergen Banquet Hall */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('assets/bergen_bg.png') no-repeat center center;
  background-size: cover;
  z-index: -2;
}

/* Soft cream veil so text stays readable over the bright hall photo */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(250, 248, 244, 0.45);
  z-index: -1;
  pointer-events: none;
}

/* Interactive sparkles canvas */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* --- Envelope Overlay Screen (Light Cream, Screen 2 Style) --- */
.envelope-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-cream-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 1.2s cubic-bezier(0.77, 0, 0.175, 1), visibility 1.2s;
  overflow: hidden;
}

.envelope-overlay.opened {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* Repeating top ornament border from reference Screen 2 */
.top-ornament-border {
  width: 100%;
  height: 70px;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='70' viewBox='0 0 60 70' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0,20 L15,5 L30,20 L15,35 Z M30,20 L45,5 L60,20 L45,35 Z' fill='none' stroke='%239e8144' stroke-width='1.5'/%3E%3Cpath d='M15,20 L30,5 L45,20 L30,35 Z' fill='none' stroke='%239e8144' stroke-width='0.75' stroke-dasharray='2%2C2'/%3E%3Cpath d='M0,55 C10,40 20,40 30,55 C40,40 50,40 60,55' fill='none' stroke='%239e8144' stroke-width='1.5'/%3E%3Cpath d='M0,60 C10,48 20,48 30,60 C40,48 50,48 60,60' fill='none' stroke='%239e8144' stroke-width='0.75'/%3E%3C/svg%3E");
  background-repeat: repeat-x;
  background-size: auto 70px;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0.9;
}

.envelope-container {
  width: 380px;
  height: 260px;
  position: relative;
  cursor: pointer;
  perspective: 1200px;
  margin-top: 60px;
  margin-bottom: 30px;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.envelope-container:hover {
  transform: translateY(-8px) scale(1.01);
}

.envelope-container:hover .envelope-shadow {
  transform: scale(0.92) translateY(12px);
  opacity: 0.45;
}

/* realistic paper envelope styling */
.envelope {
  width: 100%;
  height: 100%;
  position: absolute;
  background-color: #f6efe0;
  border-radius: 4px;
  box-shadow: 0 12px 30px rgba(124, 100, 65, 0.15);
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid rgba(158, 129, 68, 0.15);
}

/* Flaps styling - cream paper overlay shades */
.envelope-flap {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  z-index: 3;
}

.envelope-flap.top {
  top: 0;
  left: 0;
  border-width: 130px 190px 0 190px;
  border-color: #eae0cb transparent transparent transparent;
  transform-origin: top center;
  transition: transform 0.7s cubic-bezier(0.25, 1, 0.5, 1), border-color 0.7s ease;
  z-index: 4;
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.05));
}

/* Symmetrical 130px height bottom flap so fold creases meet exactly at center */
.envelope-flap.bottom {
  bottom: 0;
  left: 0;
  border-width: 0 190px 130px 190px;
  border-color: transparent transparent #f9f4e8 transparent;
}

.envelope-flap.left {
  top: 0;
  left: 0;
  border-width: 130px 0 130px 190px;
  border-color: transparent transparent transparent #f0e7d5;
}

.envelope-flap.right {
  top: 0;
  right: 0;
  border-width: 130px 190px 130px 0;
  border-color: transparent #f0e7d5 transparent transparent;
}

/* Gold wax seal container - perfectly centered mathematically */
.wax-seal {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 76px;
  height: 76px;
  z-index: 5;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 0.7s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.5s ease;
  background: transparent;
  box-shadow: none;
}

.us-kut-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 4px 10px rgba(124, 100, 65, 0.35));
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.envelope-container:hover .us-kut-svg {
  transform: scale(1.08) rotate(5deg);
}

/* Inside Preview Card */
.envelope-card-preview {
  position: absolute;
  top: 15px;
  left: 15px;
  width: 350px;
  height: 230px;
  background: var(--color-cream-bg);
  border: 1px solid var(--color-gold);
  border-radius: 4px;
  z-index: 2;
  transform: translateY(10px) scale(0.96);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.envelope-card-preview h3 {
  font-family: var(--font-serif);
  color: var(--color-gold-dark);
  font-size: 1.3rem;
  letter-spacing: 4px;
  margin-bottom: 8px;
  font-weight: 500;
}

.envelope-card-preview p {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
}

/* Envelope Shadow */
.envelope-shadow {
  position: absolute;
  bottom: -20px;
  left: 15px;
  width: 350px;
  height: 16px;
  background: rgba(124, 100, 65, 0.2);
  border-radius: 50%;
  filter: blur(8px);
  z-index: -1;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s ease;
}

/* Interactive envelope open states */
.envelope-container.open .envelope-flap.top {
  transform: rotateX(180deg);
  border-color: #f7eed8 transparent transparent transparent;
  z-index: 4; /* Keep at z-index 4 so it transitions smoothly without layer jumps */
}

/* Delayed slide-out for cards once top flap is clear */
.envelope-container.open .envelope-card-preview {
  transform: translateY(-90px) scale(1.02);
  z-index: 5;
  box-shadow: 0 15px 30px rgba(124, 100, 65, 0.25);
  transition-delay: 0.55s; /* Wait for flap to open to prevent clipping through paper */
}

.envelope-container.open .wax-seal {
  transform: translate(-50%, -90px) scale(0.5);
  opacity: 0;
  pointer-events: none;
}

/* Text prompt above/below envelope */
.envelope-prompt {
  text-align: center;
  font-size: 1.15rem;
  letter-spacing: 3.5px;
  color: var(--color-gold-dark);
  font-family: var(--font-serif);
  text-transform: uppercase;
  font-weight: 500;
  line-height: 1.7;
  cursor: pointer;
  max-width: 90%;
  animation: pulse 2.5s infinite ease-in-out;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.envelope-prompt.hide {
  animation: none;
  opacity: 0 !important;
  transform: translateY(-12px);
  pointer-events: none;
}

/* --- Main Layout --- */
.page-wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 20px 100px 20px;
  display: flex;
  flex-direction: column;
  gap: 50px;
}

/* Glassmorphic Panel Base (Lighter, creamier tone) */
.glass-panel {
  background: var(--glass-bg);
  border: 1.5px solid var(--glass-border);
  border-radius: 20px;
  padding: 60px 45px;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease;
}

.glass-panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(124, 100, 65, 0.16);
}

/* Scroll Reveal Animation Styles */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.4s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Child reveal animation primitives */
.reveal-left,
.reveal-right,
.reveal-up,
.reveal-scale {
  opacity: 0;
  will-change: transform, opacity;
  transition: opacity 1.4s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left {
  transform: translateX(-40px);
}

.reveal-right {
  transform: translateX(40px);
}

.reveal-up {
  transform: translateY(40px);
}

.reveal-scale {
  transform: scale(0.92);
}

/* Active states for child elements when parent panel becomes active */
.glass-panel.active .reveal-left,
.glass-panel.active .reveal-right,
.glass-panel.active .reveal-up,
.glass-panel.active .reveal-scale {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* Staggered animation delays for Intro Panel */
.intro-panel.active .invitation-emblem { transition-delay: 0.1s; }
.intro-panel.active h1 { transition-delay: 0.35s; }
.intro-panel.active .subtitle { transition-delay: 0.55s; }
.intro-panel.active .cursive-title { transition-delay: 0.75s; }
.intro-panel.active .invitation-text { transition-delay: 0.95s; }
.intro-panel.active .bottom-decor { transition-delay: 1.15s; }
.intro-panel.active .scroll-indicator { transition-delay: 1.35s; }

/* Staggered animation delays for Details Panel */
.details-panel.active .date-large { transition-delay: 0.1s; }
.details-panel.active .year-label { transition-delay: 0.25s; }
.details-panel.active .timeline-item:nth-child(1) { transition-delay: 0.45s; }
.details-panel.active .timeline-item:nth-child(2) { transition-delay: 0.65s; }
.details-panel.active .timeline-item:nth-child(3) { transition-delay: 0.85s; }
.details-panel.active .venue-box { transition-delay: 1.05s; }
.details-panel.active .map-container { transition-delay: 1.25s; }
.details-panel.active .btn-map { transition-delay: 1.45s; }
.details-panel.active .scroll-indicator { transition-delay: 1.65s; }

/* Staggered animation delays for RSVP Panel */
.rsvp-panel.active h2 { transition-delay: 0.1s; }
.rsvp-panel.active .rsvp-subtitle { transition-delay: 0.25s; }
.rsvp-panel.active .form-group:nth-child(1) { transition-delay: 0.45s; }
.rsvp-panel.active .form-group:nth-child(2) { transition-delay: 0.65s; }
.rsvp-panel.active .btn-submit { transition-delay: 0.85s; }
.rsvp-panel.active .scroll-indicator { transition-delay: 1.05s; }

/* Staggered animation delays for Photo Panel */
.photo-panel.active h2 { transition-delay: 0.1s; }
.photo-panel.active .photo-frame { transition-delay: 0.3s; }
.photo-panel.active .footer-text { transition-delay: 0.5s; }

/* Scroll Indicator Button Styles */
.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 35px auto 0 auto;
  width: max-content;
  cursor: pointer;
  color: var(--color-gold);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.scroll-indicator:hover {
  color: var(--color-gold-dark);
}

.scroll-indicator:hover .scroll-arrow {
  transform: translateY(4px);
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  fill: currentColor;
  margin-top: 4px;
  animation: bounce-arrow 2s infinite ease-in-out;
}

@keyframes bounce-arrow {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(6px);
  }
}

/* Interactive Map Container */
.map-container {
  width: 100%;
  max-width: 600px;
  height: 320px;
  margin: 30px auto;
  border-radius: 12px;
  overflow: hidden;
  border: 1.5px solid var(--glass-border);
  box-shadow: 0 8px 25px rgba(124, 100, 65, 0.08);
  transition: var(--transition-smooth);
}

.map-container:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(124, 100, 65, 0.15);
  border-color: var(--color-gold);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* --- Yakut Ornament Elements --- */
.ornament-decor {
  width: 100%;
  max-width: 280px;
  height: 40px;
  margin: 0 auto 25px auto;
  display: block;
  fill: var(--color-gold);
  opacity: 0.85;
}

.ornament-decor.bottom-decor {
  margin: 25px auto 0 auto;
}

.ornament-corner {
  position: absolute;
  width: 45px;
  height: 45px;
  fill: var(--color-gold);
  opacity: 0.25;
  pointer-events: none;
}

.ornament-corner.top-left { top: 15px; left: 15px; }
.ornament-corner.top-right { top: 15px; right: 15px; transform: scaleX(-1); }
.ornament-corner.bottom-left { bottom: 15px; left: 15px; transform: scaleY(-1); }
.ornament-corner.bottom-right { bottom: 15px; right: 15px; transform: scale(-1); }

/* --- Section 1: Invitation Intro (Screen 3 style) --- */
.intro-panel {
  text-align: center;
  position: relative;
}

/* Gold Us Kut Emblem on the card header */
.invitation-emblem {
  width: 100px;
  height: 100px;
  margin: 0 auto 20px auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.us-kut-emblem-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 3px 6px rgba(158, 129, 68, 0.25));
}

.intro-panel h1 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 500;
  color: var(--color-gold-dark);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-top: 15px;
  margin-bottom: 5px;
  line-height: 1.3;
}

.intro-panel .subtitle {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  letter-spacing: 6px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 40px;
}

/* Cursive handwritten "Дорогой гость!" */
.cursive-title {
  font-family: var(--font-accent);
  font-size: 3.2rem;
  color: var(--color-gold-dark);
  margin-bottom: 30px;
  display: inline-block;
}

/* circular blessing ornament background behind text */
.sun-ornament-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  max-width: 480px;
  height: auto;
  fill: none;
  color: var(--color-gold);
  opacity: 0.07;
  pointer-events: none;
  z-index: 0;
}

/* Beautiful capitalized spaced serif text style */
.invitation-text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 2.1;
  text-transform: uppercase;
  letter-spacing: 2px;
  max-width: 580px;
  margin: 0 auto;
  color: var(--color-gold-dark);
  position: relative;
  z-index: 1;
}

/* --- Section 2: Event Details --- */
.date-large {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  color: var(--color-gold-dark);
  text-align: center;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 3px;
  margin-bottom: 5px;
}

.year-label {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 40px;
  font-weight: 500;
}

/* Timeline of events */
.timeline {
  position: relative;
  max-width: 500px;
  margin: 0 auto 40px auto;
  padding-left: 35px;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 5px;
  width: 1.5px;
  height: calc(100% - 20px);
  background: linear-gradient(to bottom, var(--color-gold) 0%, rgba(158, 129, 68, 0.15) 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: 35px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  top: 8px;
  left: -35px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--color-cream-bg);
  border: 2px solid var(--color-gold);
  z-index: 2;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.4s ease;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.3);
  background-color: var(--color-gold);
}

.timeline-time {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-gold-dark);
  margin-bottom: 5px;
  letter-spacing: 1px;
}

.timeline-desc {
  font-size: 0.95rem;
  color: var(--color-text-dark);
  font-weight: 500;
}

/* Venue Section styling */
.venue-box {
  text-align: center;
  border-top: 1px solid rgba(158, 129, 68, 0.15);
  padding-top: 40px;
  margin-top: 20px;
}

.venue-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--color-gold-dark);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.venue-name {
  font-size: 1.25rem;
  color: var(--color-text-dark);
  font-weight: 600;
  margin-bottom: 6px;
}

.venue-address {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 30px;
}

/* 2GIS Map Button */
.btn-map {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
  color: #fff;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 35px;
  border-radius: 4px;
  box-shadow: 0 4px 15px rgba(124, 100, 65, 0.2);
  transition: var(--transition-smooth);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-map:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(124, 100, 65, 0.35);
  background: linear-gradient(135deg, #b89746 0%, var(--color-gold) 100%);
}

.btn-map svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* --- Section 3: Guest RSVP Questionnaire --- */
.rsvp-panel {
  text-align: center;
}

.rsvp-panel h2 {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  color: var(--color-gold-dark);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.rsvp-panel p.rsvp-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 40px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* Form Styles */
.rsvp-form {
  max-width: 480px;
  margin: 0 auto;
  text-align: left;
}

.form-group {
  margin-bottom: 30px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  margin-bottom: 10px;
  font-weight: 600;
}

.form-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(158, 129, 68, 0.25);
  border-radius: 4px;
  padding: 15px 20px;
  color: var(--color-text-dark);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

.form-input:focus {
  outline: none;
  background: #fff;
  border-color: var(--color-gold);
  box-shadow: 0 0 12px rgba(158, 129, 68, 0.15);
}

/* Beautiful custom radio buttons */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 10px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  position: relative;
  font-size: 0.95rem;
  color: var(--color-text-dark);
  transition: var(--transition-smooth);
  font-weight: 500;
}

.radio-label input {
  display: none;
}

.radio-custom {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(158, 129, 68, 0.4);
  border-radius: 50%;
  position: relative;
  transition: var(--transition-smooth);
  background-color: #fff;
}

.radio-label input:checked + .radio-custom {
  border-color: var(--color-gold);
  box-shadow: 0 0 6px rgba(158, 129, 68, 0.3);
}

.radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-gold);
  transition: transform 0.2s ease;
}

.radio-label input:checked + .radio-custom::after {
  transform: translate(-50%, -50%) scale(1);
}

.btn-submit {
  width: 100%;
  background: transparent;
  border: 1.5px solid var(--color-gold);
  color: var(--color-gold-dark);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  padding: 16px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 15px;
  transition: var(--transition-smooth);
}

.btn-submit:hover {
  background: var(--color-gold);
  color: #fff;
  box-shadow: 0 8px 20px rgba(158, 129, 68, 0.2);
}

/* RSVP Success Overlay */
.rsvp-success {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-cream-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
  padding: 40px;
  text-align: center;
}

.rsvp-success.active {
  opacity: 1;
  visibility: visible;
}

.rsvp-success svg {
  width: 65px;
  height: 65px;
  fill: var(--color-gold);
  margin-bottom: 20px;
}

.rsvp-success h3 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  color: var(--color-gold-dark);
  margin-bottom: 10px;
}

.rsvp-success p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* --- Section 4: Class Photo Frame --- */
.photo-panel {
  text-align: center;
}

.photo-panel h2 {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  color: var(--color-gold-dark);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 15px;
}

/* --- Class Photo Tabs & Galleries --- */
.class-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 20px auto 25px auto;
  max-width: 100%;
  flex-wrap: wrap;
}

.class-tab-btn {
  background: rgba(255, 255, 255, 0.4);
  border: 1px solid var(--glass-border);
  color: var(--color-gold-dark);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 30px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.class-tab-btn:hover {
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--color-gold);
  transform: translateY(-1px);
}

.class-tab-btn.active {
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
  color: #fff;
  border-color: var(--color-gold);
  box-shadow: 0 4px 12px rgba(124, 100, 65, 0.25);
}

.class-galleries-container {
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

.class-gallery {
  display: none;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.class-gallery.active {
  display: block;
  opacity: 1;
}

.carousel-container {
  width: 100%;
  aspect-ratio: 3/2;
  border-radius: 12px;
  border: 1.5px solid var(--glass-border);
  position: relative;
  overflow: hidden;
  box-shadow: var(--glass-shadow);
  background: rgba(0, 0, 0, 0.03);
}

.carousel-track {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.carousel-slide {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.carousel-slide-bg {
  position: absolute;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  background-size: cover;
  background-position: center;
  filter: blur(25px) brightness(0.5);
  z-index: 1;
  pointer-events: none;
  opacity: 0.85;
}

.carousel-slide img {
  position: relative;
  z-index: 2;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.25);
  cursor: zoom-in;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--glass-border);
  color: var(--color-gold-dark);
  font-size: 1.4rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
  transition: var(--transition-smooth);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.carousel-btn:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: var(--color-gold);
  color: var(--color-gold);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.carousel-btn.prev {
  left: 10px;
}

.carousel-btn.next {
  right: 10px;
}

.carousel-dots {
  position: absolute;
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.carousel-dots .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.carousel-dots .dot.active {
  background: var(--color-gold-light);
  transform: scale(1.25);
  box-shadow: 0 0 8px var(--color-gold-light);
  border-color: transparent;
}

.photo-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  border-radius: 12px;
  border: 1.5px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  z-index: 0;
  color: var(--color-text-muted);
  padding: 40px;
  box-shadow: inset 0 0 20px rgba(124, 100, 65, 0.05);
}

.photo-placeholder svg {
  width: 55px;
  height: 55px;
  fill: rgba(158, 129, 68, 0.35);
  animation: float-slow 4s infinite ease-in-out;
}

.photo-placeholder span {
  font-size: 0.9rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  font-weight: 600;
}

.photo-placeholder p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  max-width: 320px;
  line-height: 1.5;
  margin: 0 auto;
}

/* Footer sign-off */
.footer-text {
  text-align: center;
  font-family: var(--font-accent);
  font-size: 3.2rem;
  color: var(--color-gold-dark);
  margin-top: 40px;
  text-shadow: 0 0 5px rgba(158, 129, 68, 0.1);
  animation: float-slow 5s infinite ease-in-out;
}

/* --- Keyframe Animations --- */
@keyframes pulse {
  0%, 100% {
    opacity: 0.85;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.01);
  }
}

@keyframes float-slow {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

/* --- Mobile Responsiveness --- */
@media (max-width: 600px) {
  .envelope-container {
    width: 320px;
    height: 220px;
    margin-top: 40px;
  }
  
  .envelope-flap.top {
    border-width: 110px 160px 0 160px;
  }
  
  .envelope-flap.bottom {
    border-width: 0 160px 110px 160px;
  }
  
  .envelope-flap.left {
    border-width: 110px 0 110px 160px;
  }
  
  .envelope-flap.right {
    border-width: 110px 160px 110px 0;
  }
  
  .envelope-shadow {
    width: 290px;
    left: 15px;
  }
  
  .wax-seal {
    width: 65px;
    height: 65px;
    top: 50%;
    left: 50%;
  }

  .envelope-prompt {
    font-size: 0.95rem;
    letter-spacing: 2px;
  }

  .page-wrapper {
    padding: 30px 15px 60px 15px;
    gap: 35px;
  }
  
  .glass-panel {
    padding: 40px 20px;
    border-radius: 14px;
  }

  .envelope-card-preview {
    width: 290px;
    height: 190px;
  }
  
  .envelope-card-preview h3 {
    font-size: 1.15rem;
  }

  .invitation-emblem {
    width: 80px;
    height: 80px;
  }

  .intro-panel h1 {
    font-size: 1.85rem;
    letter-spacing: 2px;
  }

  .intro-panel .subtitle {
    font-size: 0.85rem;
    letter-spacing: 4px;
    margin-bottom: 25px;
  }

  .cursive-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
  }

  .invitation-text {
    font-size: 0.9rem;
    line-height: 1.9;
    letter-spacing: 1.5px;
  }

  .date-large {
    font-size: 2.5rem;
    letter-spacing: 2px;
  }

  .year-label {
    font-size: 0.95rem;
    letter-spacing: 3px;
    margin-bottom: 25px;
  }

  .timeline {
    padding-left: 25px;
  }

  .timeline-time {
    font-size: 1.2rem;
  }

  .venue-title {
    font-size: 1.35rem;
    letter-spacing: 1.5px;
  }

  .venue-name {
    font-size: 1.15rem;
  }

  .rsvp-panel h2, .photo-panel h2 {
    font-size: 1.7rem;
    letter-spacing: 2px;
  }

  .btn-map {
    width: 100%;
    justify-content: center;
    padding: 13px 20px;
  }

  .footer-text {
    font-size: 2.3rem;
    margin-top: 20px;
  }
}

/* --- Lightbox / Fullscreen Image Viewer --- */
.lightbox-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 13, 10, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 10000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.lightbox-overlay.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 25px;
  background: none;
  border: none;
  color: #fff;
  font-size: 3rem;
  line-height: 1;
  cursor: pointer;
  z-index: 10010;
  transition: var(--transition-smooth);
}

.lightbox-close:hover {
  color: var(--color-gold-light);
  transform: rotate(90deg);
}

.lightbox-content {
  width: 100%;
  height: 100%;
  overflow: auto;
  display: flex;
  box-sizing: border-box;
  padding: 40px;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
  cursor: zoom-in;
  user-select: none;
  margin: auto;
  transition: width 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              max-width 0.35s ease,
              max-height 0.35s ease;
  width: auto;
  height: auto;
}

.lightbox-content img.zoomed {
  width: 180%;
  max-width: none;
  max-height: none;
  cursor: zoom-out;
}

/* --- Countdown Timer --- */
.countdown-container {
  text-align: center;
  margin-top: 40px;
  margin-bottom: 20px;
}

.countdown-title {
  font-family: var(--font-accent);
  font-size: 2.2rem;
  color: var(--color-gold);
  margin-bottom: 25px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.countdown-timer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 25px;
}

.countdown-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 65px;
}

.countdown-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  color: var(--color-gold-dark);
  line-height: 1;
  transition: transform 0.3s ease;
}

.countdown-num.animate {
  animation: numPulse 0.4s ease-out;
}

.countdown-label {
  font-family: var(--font-accent);
  font-size: 1.15rem;
  color: var(--color-gold);
  margin-top: 5px;
}

@keyframes numPulse {
  0% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

@media (max-width: 480px) {
  .countdown-timer {
    gap: 15px;
  }
  .countdown-item {
    min-width: 50px;
  }
  .countdown-num {
    font-size: 2rem;
  }
  .countdown-label {
    font-size: 1rem;
  }
}