/* --------------------------------------------------------------------------
   OPEN WHEN YOU WANT — A Birthday Space for Viken from Jena
   Design Philosophy: Minimal, Editorial, Restrained, Youthful, Personal
   -------------------------------------------------------------------------- */

:root {
  --bg: #000000;
  --text: #FFFF00;
  --muted: #FF0000;
  --accent: #FF0000;
  --secondary: #0000FF;
  --border: #0000FF;
  
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --max-width: 820px;
  --pad-x: 24px;
  --pad-x-desktop: 44px;
  
  --transition-fast: 180ms ease;
  --transition-smooth: 340ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fade: 260ms ease;
}

/* Base & Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  line-height: 1.45;
}

/* Typography Defaults */
h1, h2, h3, p, span, a, button {
  font-family: var(--font-main);
  color: inherit;
  font-weight: 400;
  letter-spacing: -0.01em;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  outline: none;
  font-size: 1rem;
}

button:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   GLOBAL TOP BAR
   -------------------------------------------------------------------------- */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  padding: 18px var(--pad-x);
  pointer-events: none;
}

@media (min-width: 768px) {
  .top-bar {
    padding: 24px var(--pad-x-desktop);
  }
}

.top-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-tag {
  font-size: 0.8125rem;
  color: var(--secondary);
  letter-spacing: 0.04em;
  text-transform: lowercase;
  pointer-events: auto;
  user-select: none;
  opacity: 0;
  transition: opacity var(--transition-fade);
}

.top-bar.show-tag .site-tag {
  opacity: 1;
}

/* Discreet Music Toggle */
.music-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  pointer-events: auto;
  padding: 6px 10px;
  border-radius: 4px;
  color: var(--muted);
  font-size: 0.8125rem;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  user-select: none;
}

.music-toggle:hover {
  color: var(--text);
  background-color: rgba(0, 0, 0, 0.03);
}

.music-indicator {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--secondary);
  transition: background-color var(--transition-fast), transform var(--transition-smooth);
}

.music-toggle.playing .music-indicator {
  background-color: var(--accent);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.4); opacity: 1; }
}

.music-text {
  letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   VIEWPORT WRAPPER & SCREEN SWITCHING
   -------------------------------------------------------------------------- */
.app-viewport {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 100vh;
  position: relative;
  padding: 32px var(--pad-x) 24px;
}

@media (min-width: 768px) {
  .app-viewport {
    padding: 40px var(--pad-x-desktop) 28px;
  }
}

.screen-view {
  display: none;
  width: 100%;
  max-width: var(--max-width);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.screen-view.active {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   1. OPENING SCREEN (Clean, Intimate, Minimal)
   -------------------------------------------------------------------------- */
.screen-opening {
  min-height: auto;
}

.opening-content-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
  width: 100%;
  max-width: 400px;
  margin: auto 0;
}

.opening-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.opening-for {
  font-size: 1.0625rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.opening-title {
  font-size: 2.25rem;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text);
}

@media (min-width: 768px) {
  .opening-title {
    font-size: 2.75rem;
  }
}

.opening-from {
  font-size: 1rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.opening-action-wrap {
  margin-top: 4px;
}

.btn-open {
  display: inline-flex;
  align-items: center;
  padding: 8px 24px;
  border: 1px solid var(--border);
  background-color: transparent;
  color: var(--text);
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.btn-open:hover {
  border-color: var(--accent);
  background-color: rgba(184, 164, 126, 0.08);
}

/* --------------------------------------------------------------------------
   2. MAIN INTERACTIVE SPACE (Single Central Composition)
   -------------------------------------------------------------------------- */
.screen-main {
  min-height: auto;
}

.composition-container {
  width: 100%;
  max-width: 540px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin: auto 0;
}

@media (min-width: 768px) {
  .composition-container {
    gap: 24px;
  }
}

/* Header & Interactive 20 */
.composition-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2px;
}

.comp-recipient {
  font-size: 0.9375rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.interactive-twenty-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.twenty-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 10px;
  border-radius: 4px;
  transition: transform var(--transition-fast);
}

.twenty-digit {
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
  transition: color var(--transition-fast);
}

.twenty-btn:hover .twenty-digit {
  color: var(--accent);
}

.twenty-note-box {
  min-height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.twenty-note-text {
  font-size: 0.8125rem;
  color: var(--accent);
  letter-spacing: 0.02em;
  opacity: 0;
  transform: translateY(-2px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  text-align: center;
}

.twenty-note-text.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Central Photo Frame */
.composition-body {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  position: relative;
}

.central-photo-frame {
  width: 100%;
  max-width: 250px;
  aspect-ratio: 4 / 5;
  background-color: var(--border);
  border-radius: 2px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

@media (min-width: 768px) {
  .central-photo-frame {
    max-width: 270px;
  }
}

.central-photo-frame:hover {
  transform: scale(1.015);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.central-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-tap-hint {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  color: var(--text);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  padding: 2px 6px;
  border-radius: 2px;
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.central-photo-frame:hover .photo-tap-hint {
  opacity: 1;
}

/* 4 Surrounding Text Triggers */
.exploration-nav {
  width: 100%;
  max-width: 440px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.trigger-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.trigger-col-left {
  align-items: flex-start;
  text-align: left;
}

.trigger-col-right {
  align-items: flex-end;
  text-align: right;
}

.explore-trigger {
  display: inline-flex;
  align-items: center;
  padding: 4px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.trigger-label {
  font-size: 0.9375rem;
  color: var(--muted);
  letter-spacing: -0.01em;
  text-transform: lowercase;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.explore-trigger:hover .trigger-label {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* Composition Footer */
.composition-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  margin-top: 2px;
}

.comp-signature {
  font-size: 0.9375rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.secret-trigger {
  font-size: 0.75rem;
  color: var(--secondary);
  letter-spacing: 0.04em;
  text-transform: lowercase;
  padding: 4px 8px;
  transition: color var(--transition-fast);
}

.secret-trigger:hover {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   INTERACTIVE OVERLAYS / PANELS
   -------------------------------------------------------------------------- */
.overlay-panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.overlay-panel.open {
  opacity: 1;
  pointer-events: auto;
}

.overlay-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  cursor: pointer;
}

.overlay-content {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 520px;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  transform: scale(0.96) translateY(6px);
  transition: transform var(--transition-smooth);
}

.overlay-panel.open .overlay-content {
  transform: scale(1) translateY(0);
}

.overlay-close-btn {
  font-size: 0.8125rem;
  color: var(--text);
  letter-spacing: 0.05em;
  text-transform: lowercase;
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 2px;
  margin-top: 2px;
  transition: all var(--transition-fast);
}

.overlay-close-btn:hover {
  color: #000000;
  border-color: var(--accent);
  background-color: var(--accent);
}

/* 1. Photo Overlay */
.expanded-image-wrapper {
  max-height: 65vh;
  width: auto;
  display: flex;
  justify-content: center;
}

.expanded-photo {
  max-height: 65vh;
  max-width: 100%;
  object-fit: contain;
  border-radius: 2px;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.6);
}

.overlay-caption-block {
  text-align: center;
}

.overlay-caption {
  font-size: 0.9375rem;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.4;
  font-weight: 400;
  text-align: center;
}

/* 2 & 4. Thought & Never Said Text Cards */
.overlay-content-text {
  max-width: 440px;
}

.thought-card,
.never-said-card {
  background-color: var(--bg);
  padding: 24px 20px;
  border-radius: 2px;
  border: 1px solid var(--border);
  width: 100%;
  text-align: center;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.2);
}

@media (min-width: 768px) {
  .thought-card,
  .never-said-card {
    padding: 28px 24px;
  }
}

.thought-text,
.never-said-text {
  font-size: 1.0625rem;
  color: var(--text);
  line-height: 1.45;
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .thought-text,
  .never-said-text {
    font-size: 1.1875rem;
  }
}

/* 3. Memories Horizontal Layout */
.overlay-content-memories {
  max-width: 720px;
}

.memories-scroll-wrap {
  display: flex;
  gap: 16px;
  width: 100%;
  overflow-x: auto;
  padding: 12px 4px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.memory-thumb-item {
  flex: 0 0 200px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  scroll-snap-align: center;
}

@media (min-width: 768px) {
  .memory-thumb-item {
    flex: 1 1 0;
  }
}

.memory-thumb-frame {
  width: 100%;
  aspect-ratio: 3 / 4;
  background-color: var(--border);
  border-radius: 2px;
  overflow: hidden;
  transition: transform var(--transition-smooth);
}

.memory-thumb-item:hover .memory-thumb-frame {
  transform: scale(1.02);
}

.memory-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.memory-thumb-caption {
  font-size: 0.8125rem;
  color: var(--text);
  line-height: 1.35;
  letter-spacing: -0.01em;
  text-align: left;
}

/* 5. Final Card */
.final-card {
  background-color: var(--bg);
  padding: 20px 18px;
  border-radius: 2px;
  border: 1px solid var(--border);
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.2);
}

@media (min-width: 768px) {
  .final-card {
    padding: 24px 22px;
  }
}

.final-photo-frame {
  width: 100%;
  max-width: 170px;
  aspect-ratio: 4 / 5;
  background-color: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.final-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.final-text-wrap {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.final-message-line {
  font-size: 1.1875rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

.final-message-line.final-muted {
  font-size: 1.0625rem;
  color: var(--muted);
}

.final-message-sig {
  font-size: 0.9375rem;
  color: var(--accent);
  margin-top: 4px;
}