/* ============================================================
   BIRTHDAY CELEBRATION — STYLE SHEET
   Design tokens faithfully mirrored from Stitch Ethereal Celebration
   ============================================================ */

/* ---------- CSS Custom Properties (Design Tokens) ---------- */
:root {
  /* Color palette */
  --surface:                  #fff8f8;
  --surface-dim:              #e5d6db;
  --surface-bright:           #fff8f8;
  --surface-container-lowest: #ffffff;
  --surface-container-low:    #fff0f5;
  --surface-container:        #f9eaef;
  --surface-container-high:   #f3e4e9;
  --surface-container-highest:#eddfe4;
  --surface-variant:          #eddfe4;
  --on-surface:               #211a1d;
  --on-surface-variant:       #514345;
  --outline:                  #847375;
  --outline-variant:          #d6c2c3;
  --surface-tint:             #874e58;

  --primary:              #874e58;
  --on-primary:           #ffffff;
  --primary-container:    #ffb6c1;
  --on-primary-container: #7b444e;
  --primary-fixed:        #ffd9de;
  --primary-fixed-dim:    #fcb3be;
  --inverse-primary:      #fcb3be;

  --secondary:              #b60078;
  --on-secondary:           #ffffff;
  --secondary-container:    #fe4bb1;
  --on-secondary-container: #5b003a;
  --secondary-fixed:        #ffd8e7;
  --secondary-fixed-dim:    #ffafd2;

  --tertiary:              #a82d68;
  --on-tertiary:           #ffffff;
  --tertiary-container:    #ffb4ce;
  --on-tertiary-container: #9b215e;
  --tertiary-fixed:        #ffd9e4;
  --tertiary-fixed-dim:    #ffb0cc;

  --error:            #ba1a1a;
  --on-error:         #ffffff;
  --error-container:  #ffdad6;
  --on-error-container: #93000a;

  --inverse-surface:    #362e32;
  --inverse-on-surface: #fcedf2;

  --background:   #fff8f8;
  --on-background:#211a1d;

  /* Typography */
  --font-headline: 'Playfair Display', Georgia, serif;
  --font-body:     'Inter', system-ui, sans-serif;

  --text-headline-xl: 48px;
  --text-headline-lg: 32px;
  --text-headline-lg-mobile: 28px;
  --text-headline-md: 24px;
  --text-body-lg: 18px;
  --text-body-md: 16px;
  --text-label-md: 14px;
  --text-label-sm: 12px;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  40px;
  --space-margin-mobile:  20px;
  --space-margin-desktop: 64px;
  --space-gutter: 16px;
  --max-width: 1200px;

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* Elevation */
  --shadow-sm:  0 1px 3px rgba(168, 45, 104, 0.05), 0 1px 2px rgba(168, 45, 104, 0.06);
  --shadow-md:  0 4px 12px rgba(168, 45, 104, 0.08), 0 2px 6px rgba(168, 45, 104, 0.06);
  --shadow-lg:  0 8px 24px rgba(168, 45, 104, 0.12), 0 4px 12px rgba(168, 45, 104, 0.08);
  --shadow-xl:  0 16px 48px rgba(168, 45, 104, 0.15), 0 8px 24px rgba(168, 45, 104, 0.10);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  line-height: 1.6;
  background-color: var(--background);
  color: var(--on-surface);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  display: block;
  max-width: 100%;
}

button, a {
  cursor: pointer;
}

a {
  text-decoration: none;
  color: inherit;
}

/* ---------- Hide scrollbar utility ---------- */
.hide-scroll::-webkit-scrollbar { display: none; }
.hide-scroll {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* ============================================================
   TOP APP BAR
   ============================================================ */
#top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 248, 248, 0.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-sm);
}

.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-margin-mobile);
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.app-title {
  font-family: var(--font-headline);
  font-size: var(--text-headline-md);
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.01em;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--primary);
  border-radius: var(--radius-full);
  transition: background 0.2s ease, transform 0.15s ease, opacity 0.2s ease;
}

.icon-btn:hover  { background: rgba(135, 78, 88, 0.08); opacity: 0.8; }
.icon-btn:active { transform: scale(0.92); }

/* ============================================================
   MAIN CONTENT
   ============================================================ */
main {
  padding-top: 64px;
  padding-bottom: 88px; /* bottom nav clearance */
}

@media (min-width: 768px) {
  main { padding-bottom: 0; }
}

/* ============================================================
   SECTION 1 — HERO (Interactive Cake)
   ============================================================ */
#hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, var(--surface-container-low) 0%, var(--surface) 100%);
  padding: var(--space-xl) var(--space-margin-mobile);
  overflow: hidden;
}

/* Confetti layer */
#confetti-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  overflow: hidden;
}

/* Animated sparkle background */
#sparkles-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.sparkle-dot {
  position: absolute;
  border-radius: 50%;
  background: var(--primary-container);
  opacity: 0;
  animation: sparkle-pulse var(--dur, 3s) ease-in-out var(--delay, 0s) infinite;
}

@keyframes sparkle-pulse {
  0%, 100% { opacity: 0; transform: scale(0.5); }
  50%       { opacity: 0.6; transform: scale(1); }
}

.hero-inner {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: 100%;
  max-width: var(--max-width);
  gap: var(--space-lg);
}

/* Happy Birthday reveal text */
.birthday-reveal {
  font-family: var(--font-headline);
  font-size: var(--text-headline-xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--tertiary);
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1), transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}

.birthday-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.birthday-reveal .accent {
  color: var(--secondary);
}

.birthday-sub {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  font-weight: 400;
  color: var(--on-surface-variant);
  margin-top: var(--space-sm);
  letter-spacing: 0;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s ease 0.4s, transform 0.7s ease 0.4s;
}

.birthday-reveal.visible .birthday-sub {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Cake Wrapper ---------- */
.cake-wrapper {
  position: relative;
  width: min(320px, 80vw);
  height: min(320px, 80vw);
  flex-shrink: 0;
  filter: drop-shadow(0 24px 48px rgba(168, 45, 104, 0.2));
  transition: filter 0.6s ease;
}

.cake-wrapper.blown .cake-img {
  animation: cake-wobble 0.6s ease;
}

@keyframes cake-wobble {
  0%   { transform: rotate(0deg); }
  20%  { transform: rotate(-3deg) scale(1.02); }
  40%  { transform: rotate(3deg) scale(1.04); }
  60%  { transform: rotate(-2deg) scale(1.02); }
  80%  { transform: rotate(1deg); }
  100% { transform: rotate(0deg); }
}

.cake-glow {
  position: absolute;
  bottom: -24px;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 40px;
  background: radial-gradient(ellipse at center, rgba(254, 75, 177, 0.35) 0%, transparent 70%);
  border-radius: 50%;
  transition: opacity 0.8s ease;
  filter: blur(8px);
}

.cake-wrapper.blown .cake-glow {
  opacity: 0;
}

.cake-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
  border-radius: var(--radius-xl);
  transition: transform 0.3s ease;
}

/* ---------- SVG Flames ---------- */
.flames-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.flame {
  transform-origin: center bottom;
  animation: flicker 0.9s ease-in-out infinite alternate;
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.flame-glow {
  transform-origin: center bottom;
  animation: glow-flicker 1.1s ease-in-out infinite alternate;
}

.flame-tip {
  transform-origin: center bottom;
  animation: flicker 0.7s ease-in-out infinite alternate;
}

/* Stagger each flame slightly */
#flame1, #ftip1, .s1 { animation-delay: 0s;    }
#flame2, #ftip2, .s2 { animation-delay: 0.12s; }
#flame3, #ftip3, .s3 { animation-delay: 0.24s; }
#flame4, #ftip4, .s4 { animation-delay: 0.36s; }
#flame5, #ftip5, .s5 { animation-delay: 0.48s; }

@keyframes flicker {
  0%   { transform: scale(1) rotate(-1.5deg);  opacity: 0.9; }
  100% { transform: scale(1.15) rotate(1.5deg); opacity: 1;   }
}

@keyframes glow-flicker {
  0%   { transform: scale(1.1) rotate(-1deg); opacity: 0.25; }
  100% { transform: scale(1.3) rotate(1deg);  opacity: 0.45; }
}

/* Extinguished state */
.flame.extinguished,
.flame-glow.extinguished,
.flame-tip.extinguished {
  opacity: 0 !important;
  transform: scale(0) translateY(8px) !important;
  animation: none !important;
}

/* ---------- Smoke ---------- */
.smoke-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.smoke-container.visible {
  opacity: 1;
}

.smoke {
  position: absolute;
  width: 4px;
  height: 24px;
  border-radius: var(--radius-full);
  background: linear-gradient(to top, rgba(129, 103, 109, 0.4), transparent);
  bottom: 22%;
  animation: smoke-rise 1.8s ease-out infinite;
  opacity: 0;
}

.s1 { left: 52%; }
.s2 { left: 55.5%; }
.s3 { left: 58%; }
.s4 { left: 60.5%; }
.s5 { left: 63%; }

@keyframes smoke-rise {
  0%   { opacity: 0;   transform: translateY(0) scaleX(1); }
  20%  { opacity: 0.5; }
  80%  { opacity: 0.3; transform: translateY(-40px) scaleX(2.5); }
  100% { opacity: 0;   transform: translateY(-60px) scaleX(3); }
}

/* ---------- CTA Area ---------- */
.hero-cta-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--secondary);
  color: var(--on-secondary);
  font-family: var(--font-body);
  font-size: var(--text-label-md);
  font-weight: 600;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-lg);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease, background 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0.2), transparent 70%);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.btn-primary:hover  { transform: scale(1.03); box-shadow: var(--shadow-xl); }
.btn-primary:hover::before { opacity: 1; }
.btn-primary:active { transform: scale(0.96); }

.btn-primary.listening {
  background: var(--tertiary);
  animation: pulse-glow 1.5s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(168, 45, 104, 0.4), var(--shadow-lg); }
  50%       { box-shadow: 0 0 0 12px rgba(168, 45, 104, 0), var(--shadow-lg); }
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 24px;
  border: 1.5px solid var(--primary-container);
  border-radius: var(--radius-full);
  background: rgba(255, 248, 248, 0.6);
  color: var(--primary);
  font-family: var(--font-body);
  font-size: var(--text-label-md);
  font-weight: 600;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform 0.2s ease, background 0.2s ease;
}

.btn-ghost:hover  { background: var(--primary-fixed); transform: scale(1.02); }
.btn-ghost:active { transform: scale(0.96); }

/* Volume meter */
.volume-meter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  width: 200px;
}

.volume-bar-track {
  width: 100%;
  height: 6px;
  background: var(--surface-container-high);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.volume-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary-container), var(--secondary));
  border-radius: var(--radius-full);
  transition: width 0.1s ease;
}

.volume-hint {
  font-size: var(--text-label-sm);
  color: var(--on-surface-variant);
  font-family: var(--font-body);
  animation: hint-pulse 2s ease-in-out infinite;
}

@keyframes hint-pulse {
  0%, 100% { opacity: 0.7; }
  50%       { opacity: 1; }
}

.mic-status {
  font-family: var(--font-body);
  font-size: var(--text-label-sm);
  color: var(--outline);
  text-align: center;
}

/* Scroll hint arrow */
.scroll-hint {
  margin-top: var(--space-lg);
  animation: bounce 2s ease-in-out infinite;
}

.scroll-chevron {
  font-size: 32px;
  color: var(--outline-variant);
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(8px); }
}

.hidden { display: none !important; }

/* ============================================================
   SECTIONS SHARED
   ============================================================ */
section {
  padding: var(--space-xl) 0;
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0 var(--space-margin-mobile) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-headline);
  font-size: var(--text-headline-lg-mobile);
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

@media (min-width: 768px) {
  .section-title { font-size: var(--text-headline-lg); }
}

.section-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--outline-variant), transparent);
  border-radius: var(--radius-full);
}

/* ============================================================
   SECTION 2 — WISH CARDS (Multi-Color Grid)
   ============================================================ */
#messages {
  background: var(--surface);
}

.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  padding: 0 var(--space-margin-mobile) var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

@media (min-width: 600px) {
  .cards-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .cards-grid {
    grid-template-columns: 1fr 1fr;
    padding-left: var(--space-margin-desktop);
    padding-right: var(--space-margin-desktop);
  }
}

/* Multi-color card — uses CSS vars injected per-card via inline style */
.wish-card-multi {
  background-color: var(--card-bg);
  border-radius: var(--radius-2xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-xl);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow 0.25s ease;
  outline: none;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.wish-card-multi::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.9), transparent);
}

.wish-card-multi:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0,0,0,0.04);
}

.wish-card-multi:active {
  transform: scale(0.97);
  transition: transform 0.1s ease;
}

.wish-card-multi:focus-visible {
  outline: 2px solid var(--card-accent);
  outline-offset: 3px;
}

/* Glass shine overlay on hover */
.wish-card-multi .card-shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: inherit;
  pointer-events: none;
}

.wish-card-multi:hover .card-shine,
.wish-card-multi:focus .card-shine {
  opacity: 1;
}

/* Card interior elements */
.card-meta-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.card-meta-icon {
  font-size: 20px;
  color: var(--card-accent);
  line-height: 1;
  flex-shrink: 0;
}

.card-tag-multi {
  font-family: var(--font-body);
  font-size: var(--text-label-sm);
  font-weight: 600;
  color: var(--card-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  line-height: 1;
}

.card-headline-multi {
  font-family: var(--font-headline);
  font-size: var(--text-headline-md);
  font-weight: 700;
  color: var(--card-accent);
  margin-bottom: var(--space-sm);
  line-height: 1.25;
}

.card-msg-multi {
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  line-height: 1.6;
  color: var(--card-text);
}

/* ============================================================
   SECTION 3 — MEMORIES / GALLERY
   ============================================================ */
#memories {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-container-low) 100%);
}

.gallery-track {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-margin-mobile) var(--space-xl);
  align-items: center;
  -ms-overflow-style: none;
  scrollbar-width: none;
  /* Ensure first/last card can be scrolled to properly */
  scroll-padding-inline: var(--space-margin-mobile);
}

.gallery-track::-webkit-scrollbar { display: none; }

.gallery-item {
  scroll-snap-align: start;
  flex-shrink: 0;
  position: relative;
  /* Fixed consistent card size — never exceeds viewport width */
  width: min(85vw, 460px);
  height: 240px;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 2.5px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  outline: none;
  background: var(--surface-container);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow 0.4s ease;
}

@media (min-width: 768px) {
  .gallery-item {
    width: min(75vw, 560px);
    height: 300px;
  }
}

/* ---- Blurred backdrop (fills card, hides letterbox bars) ---- */
.gallery-bg {
  position: absolute;
  inset: -8px;          /* slightly oversized to cover blur edges */
  width: calc(100% + 16px);
  height: calc(100% + 16px);
  object-fit: cover;
  object-position: center;
  filter: blur(18px) brightness(0.55) saturate(1.3);
  transform: scale(1.05);
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

/* ---- Main image — always 100% visible, no cropping ---- */
.gallery-main {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  transition: transform 0.5s ease;
}

.gallery-item:hover .gallery-main {
  transform: scale(1.04);
}

/* Tilt effects */
.rotate-2       { transform: rotate(2deg);  }
.rotate-1       { transform: rotate(1deg);  }
.rotate-minus-1 { transform: rotate(-1deg); }
.rotate-minus-2 { transform: rotate(-2deg); }

.gallery-item:hover,
.gallery-item:focus {
  transform: rotate(0deg) scale(1.03);
  z-index: 10;
  box-shadow: var(--shadow-xl);
}

.gallery-item:active {
  transform: scale(0.97);
  transition: transform 0.1s ease;
}

/* Caption overlay — z-index: 2 to sit above .gallery-main */
.gallery-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(to top, rgba(54, 46, 50, 0.65), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2;
}

.gallery-item:hover .gallery-overlay,
.gallery-item:focus .gallery-overlay {
  opacity: 1;
}

.gallery-caption {
  font-family: var(--font-body);
  font-size: var(--text-label-sm);
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.gallery-hint {
  text-align: center;
  font-family: var(--font-body);
  font-size: var(--text-label-sm);
  color: var(--outline-variant);
  padding: 0 var(--space-margin-mobile);
  letter-spacing: 0.05em;
}

/* ============================================================
   BOTTOM NAV (Mobile Only)
   ============================================================ */
#bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: var(--space-sm) var(--space-margin-mobile);
  padding-bottom: max(var(--space-sm), env(safe-area-inset-bottom));
  background: rgba(255, 248, 248, 0.75);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-top: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -4px 20px rgba(168, 45, 104, 0.08);
}

@media (min-width: 768px) {
  #bottom-nav { display: none; }
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  color: rgba(81, 67, 69, 0.55);
  transition: color 0.2s ease, background 0.2s ease, transform 0.15s ease;
  font-size: 10px;
}

.nav-item .material-symbols-outlined {
  font-size: 24px;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-item:hover .material-symbols-outlined {
  transform: scale(1.15);
}

.nav-item:active {
  transform: scale(0.9);
}

.nav-item.active {
  color: var(--on-secondary-container);
  background: var(--secondary-container);
}

.nav-label {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
}

/* ============================================================
   CONFETTI PIECES
   ============================================================ */
.confetti-piece {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  border-radius: 2px;
}

/* ============================================================
   RESPONSIVE TWEAKS
   ============================================================ */
@media (min-width: 768px) {
  .cake-wrapper {
    width: 384px;
    height: 384px;
  }

  .birthday-reveal {
    font-size: clamp(40px, 6vw, 64px);
  }
}

@media (min-width: 1024px) {

  .gallery-track,
  .gallery-hint {
    padding-left: var(--space-margin-desktop);
    padding-right: var(--space-margin-desktop);
  }
}

/* ============================================================
   ENTRY ANIMATIONS (triggered via JS IntersectionObserver)
   ============================================================ */
.fade-in-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delay helpers */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }