/* ============================================= */
/* Happy Birthday Nidhi - Stylesheet            */
/* ============================================= */

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

:root {
    --pink: #ff6ec7;
    --purple: #7b68ee;
    --deep-purple: #4a2f8f;
    --accent-1: #ff8ad8;          /* FEATURE 1: theme accent color 1 (overridden by theme classes) */
    --accent-2: #c76ad9;          /* FEATURE 1: theme accent color 2 */
    --accent-3: #7b68ee;          /* FEATURE 1: theme accent color 3 */
    --bg-gradient: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 40%, var(--accent-3) 100%);
    --bg-gradient-soft: linear-gradient(160deg, var(--accent-1) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-bg-strong: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.3);
    --text-light: #ffffff;
    --text-soft: #f3e9ff;
    --shadow-glow: 0 0 40px rgba(var(--accent-rgb), 0.45);
    --accent-rgb: 255, 110, 199;  /* FEATURE 1: RGB triplet for rgba() usage in themes */
    /* NEW: consistent fallback for browsers without backdrop-filter support */
    --glass-fallback: rgba(85, 40, 120, 0.75);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Poppins", "Segoe UI", system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--text-light);
    background: var(--bg-gradient);
}

/* ---------- Page System ---------- */
.page {
    position: fixed;
    inset: 0;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.98);
    transition: opacity 0.9s ease, transform 0.9s ease, visibility 0.9s ease;
    z-index: 1;
}

.page.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
    z-index: 2;
}

/* ---------- Backgrounds ---------- */
#welcome-page {
    background: var(--bg-gradient-soft);
    background-size: 300% 300%;
    animation: gradientShift 14s ease infinite;
}

#gallery-page {
    background: var(--bg-gradient);
    background-size: 300% 300%;
    animation: gradientShift 16s ease infinite;
}

@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Animated gradient sphere decorations */
#gallery-page::before,
#gallery-page::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    filter: blur(70px);
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}
#gallery-page::before {
    width: 360px;
    height: 360px;
    background: rgba(var(--accent-rgb), 0.6);
    top: -90px;
    left: -90px;
    animation: floatSphere 12s ease-in-out infinite;
}
#gallery-page::after {
    width: 420px;
    height: 420px;
    background: rgba(var(--accent-rgb), 0.45);
    bottom: -120px;
    right: -120px;
    animation: floatSphere 14s ease-in-out infinite reverse;
}
@keyframes floatSphere {
    0%, 100% { transform: translate(0, 0); }
    50%      { transform: translate(40px, -30px); }
}

/* ---------- Glassmorphism Cards ---------- */
.welcome-card,
.gallery-card {
    position: relative;
    z-index: 2;
    background: var(--glass-fallback); /* FIX: solid fallback when backdrop-filter unsupported */
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    box-shadow: var(--shadow-glow);
    max-width: 640px;
    width: 100%;
    text-align: center;
    padding: 52px 40px;
}

/* FIX: progressive enhancement — apply blur only where supported */
@supports (backdrop-filter: blur(16px)) or (-webkit-backdrop-filter: blur(16px)) {
    .welcome-card,
    .gallery-card {
        background: var(--glass-bg);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }
}

.gallery-card {
    max-width: 760px;
    padding: 44px 36px;
}

/* ---------- Fade-in utility ---------- */
.fade-in {
    animation: fadeInUp 1.1s ease both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(28px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- Welcome Page Typography ---------- */
.cake-icon {
    font-size: 4rem;
    margin-bottom: 10px;
    animation: bob 2.6s ease-in-out infinite;
}

@keyframes bob {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-12px); }
}

.welcome-title {
    font-size: clamp(1.5rem, 4.5vw, 2.6rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 34px;
    text-shadow: 0 2px 18px rgba(74, 47, 143, 0.5);
}

/* ---------- Glowing Button ---------- */
.btn-glow {
    position: relative;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 1.18rem;
    font-weight: 600;
    color: #fff;
    padding: 16px 44px;
    border-radius: 50px;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.9), rgba(var(--accent-rgb), 0.6));
    box-shadow: 0 8px 28px rgba(var(--accent-rgb), 0.55);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
    animation: pulseGlow 2.4s ease-in-out infinite;
}

.btn-glow::after {
    content: "";
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.6s ease;
}

.btn-glow:hover {
    transform: translateY(-3px) scale(1.04);
    box-shadow: 0 12px 36px rgba(var(--accent-rgb), 0.7);
}

.btn-glow:hover::after {
    left: 100%;
}

.btn-glow:active {
    transform: translateY(0) scale(0.98);
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 8px 28px rgba(var(--accent-rgb), 0.55); }
    50%      { box-shadow: 0 8px 40px rgba(var(--accent-rgb), 0.9); }
}

/* ---------- Floating Balloons ---------- */
.balloon-float {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
    pointer-events: none;
}

.balloon {
    position: absolute;
    bottom: -120px;
    width: 70px;
    height: 88px;
    border-radius: 50% 50% 48% 48%;
    background: linear-gradient(135deg, rgba(255,255,255,0.55), rgba(255,255,255,0.15));
}
.balloon::after {
    /* string */
    content: "";
    position: absolute;
    top: 88px;
    left: 50%;
    width: 2px;
    height: 60px;
    background: rgba(255,255,255,0.45);
    transform: translateX(-50%);
}
.balloon::before {
    /* highlight */
    content: "";
    position: absolute;
    top: 14px;
    left: 16px;
    width: 16px;
    height: 22px;
    border-radius: 50%;
    background: rgba(255,255,255,0.7);
    filter: blur(2px);
}

/* Balloon colours & float positions */
.balloon.b1 { left: 8%;  background: linear-gradient(135deg, #ff8ad8, #ff5bbf); animation: floatUp 11s linear infinite; }
.balloon.b2 { left: 22%; background: linear-gradient(135deg, #b39dff, #7b68ee); animation: floatUp 14s linear infinite 2s; }
.balloon.b3 { left: 42%; background: linear-gradient(135deg, #ffc1e6, #ff8ad8); animation: floatUp 13s linear infinite 4s; }
.balloon.b4 { left: 60%; background: linear-gradient(135deg, #a3ffe6, #5ee5c9); animation: floatUp 16s linear infinite 1s; }
.balloon.b5 { left: 78%; background: linear-gradient(135deg, #ffd3a3, #ffa45b); animation: floatUp 12s linear infinite 3s; }
.balloon.b6 { left: 90%; background: linear-gradient(135deg, #c2a3ff, #9d7bff); animation: floatUp 15s linear infinite 5s; }

@keyframes floatUp {
    0%   { transform: translateY(0)    rotate(0deg);   opacity: 0; }
    10%  { opacity: 0.85; }
    90%  { opacity: 0.85; }
    100% { transform: translateY(-110vh) rotate(15deg); opacity: 0; }
}

/* ---------- Gallery Page Typography ---------- */
.gallery-title {
    font-size: clamp(1.7rem, 5vw, 2.9rem);
    font-weight: 700;
    margin-bottom: 12px;
    text-shadow: 0 2px 20px rgba(74, 47, 143, 0.5);
}

.gallery-message {
    font-size: clamp(0.9rem, 2.2vw, 1.08rem);
    line-height: 1.6;
    color: var(--text-soft);
    max-width: 540px;
    margin: 0 auto 28px;
}

/* ---------- Slideshow ---------- */
.slideshow-wrapper {
    position: relative;
    width: 100%;
    max-width: 580px;
    aspect-ratio: 4 / 3;
    margin: 0 auto;
    border-radius: 22px;                          /* FEATURE 5: slightly more rounded */
    overflow: hidden;
    /* FEATURE 5: layered shadow — deep base + soft glow + accent glow */
    box-shadow:
        0 10px 36px rgba(0, 0, 0, 0.35),
        0 0 30px rgba(var(--accent-rgb), 0.25),
        inset 0 0 0 1px var(--glass-border);
    border: 2px solid rgba(255, 255, 255, 0.35);  /* FEATURE 5: elegant border */
    transition: box-shadow 0.5s ease;
}

/* FEATURE 5: subtle glow pulse on the frame */
.slideshow-wrapper:hover {
    box-shadow:
        0 14px 44px rgba(0, 0, 0, 0.4),
        0 0 50px rgba(var(--accent-rgb), 0.4),
        inset 0 0 0 1px var(--glass-border);
}

.slideshow {
    position: relative;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transform: scale(1.08);                        /* FEATURE 5: slightly larger initial zoom */
    transition: opacity 1.2s cubic-bezier(0.4, 0, 0.2, 1), transform 6s ease-out;  /* FEATURE 5: slow Ken Burns zoom */
}

.slide.active {
    opacity: 1;
    transform: scale(1);                           /* FEATURE 5: smooth zoom-out as photo displays */
}

/* ---------- Photo Counter ---------- */
/* NEW: Prev / Next arrow buttons for manual slideshow navigation.
   Positioned at the bottom-right of the image as requested.     */
.slide-arrow {
    position: absolute;
    bottom: 14px;
    width: 40px;
    height: 40px;
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    background: rgba(74, 47, 143, 0.75);
    color: #fff;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, background 0.3s ease;
    padding: 0;
}

@supports (backdrop-filter: blur(6px)) or (-webkit-backdrop-filter: blur(6px)) {
    .slide-arrow {
        background: rgba(74, 47, 143, 0.5);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
    }
}

.slide-arrow:hover {
    background: rgba(255, 110, 199, 0.8);
    transform: scale(1.12);
}

.slide-arrow:active {
    transform: scale(0.95);
}

/* Position next arrow to the left of the photo counter */
.slide-arrow-next {
    right: 14px;
}

/* Position prev arrow to the left of the next arrow */
.slide-arrow-prev {
    right: 62px;
}

.photo-counter {
    position: absolute;
    bottom: 14px;
    right: 96px;             /* FIX: adjust counter position for smaller arrows on mobile */
    background: rgba(74, 47, 143, 0.75);     /* FIX: darker fallback */
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 3;
}

/* ---------- Navigation Dots ---------- */
.slide-nav {
    display: flex;
    justify-content: center;
    gap: 8px;                              /* FIX: tighter spacing between dots */
    margin-top: 22px;
}

.slide-nav .dot {
    border: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
    /* FIX: reduced padding from 16px → 6px so dots appear small
       and compact while keeping a reasonable touch target */
    padding: 6px;
    box-sizing: content-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* The visible dot inside the touch area */
.slide-nav .dot::after {
    content: "";
    display: block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.slide-nav .dot.active::after {
    background: #fff;
    transform: scale(1.3);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.8);
}

.slide-nav .dot:hover::after {
    background: rgba(255, 255, 255, 0.85);
}

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

.confetti {
    position: absolute;
    top: -10px;
    width: 10px;
    height: 14px;
    opacity: 0.9;
    animation: confettiFall linear forwards;
}

@keyframes confettiFall {
    0%   { transform: translateY(0) rotate(0deg);   opacity: 1; }
    100% { transform: translateY(105vh) rotate(720deg); opacity: 0; }
}

/* ---------- Responsive Adjustments ---------- */
@media (max-width: 600px) {
    .welcome-card {
        padding: 40px 22px;
    }
    .gallery-card {
        padding: 34px 18px;
    }
    .cake-icon {
        font-size: 3rem;
    }
    .btn-glow {
        padding: 14px 34px;
        font-size: 1.05rem;
    }
    .photo-counter {
        font-size: 0.75rem;
        padding: 5px 12px;
        right: 96px;             /* FIX: adjust counter position for smaller arrows on mobile */
    }
    .balloon {
        width: 52px;
        height: 66px;
    }
    .balloon::after {
        height: 44px;
    }
    /* NEW: smaller arrow buttons on mobile */
    .slide-arrow {
        width: 34px;
        height: 34px;
        font-size: 1.25rem;
    }
    .slide-arrow-next {
        right: 12px;
    }
    .slide-arrow-prev {
        right: 52px;             /* FIX: adjusted for 34px arrow + 6px gap */
    }
}

@media (max-width: 380px) {
    .welcome-title {
        font-size: 1.35rem;
    }
    .gallery-title {
        font-size: 1.5rem;
    }
    .btn-glow {
        padding: 12px 28px;
    }
    /* FIX: tighten dot padding on very small screens */
    .slide-nav .dot {
        padding: 4px;
    }
    /* FIX: prevent mute button overflow on tiny screens */
    .mute-btn {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
        top: 12px;
        right: 12px;
    }
}

/* ============================================= */
/* NEW: Loading Spinner                          */
/* Shows over the slideshow until the first     */
/* image finishes loading.                      */
/* ============================================= */
.slide-loader {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(74, 47, 143, 0.3);
    z-index: 4;
    transition: opacity 0.4s ease;
}

.slide-loader .spinner {
    width: 44px;
    height: 44px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================= */
/* NEW: Slide Caption                            */
/* Displays a personal caption under each photo */
/* ============================================= */
.slide-caption {
    text-align: center;
    font-size: 0.95rem;
    font-style: italic;
    color: var(--text-soft);
    margin-top: 16px;
    min-height: 1.4em;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.slide-caption:empty {
    min-height: 0;
    margin-top: 0;
}

/* ============================================= */
/* NEW: Mute / Unmute Button                     */
/* Floating control for background music        */
/* ============================================= */
.mute-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-fallback);
    color: #fff;
    font-size: 1.25rem;
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.5s ease;
    box-shadow: 0 4px 18px rgba(74, 47, 143, 0.4);
}

/* FIX: hide mute button on the welcome page (Page 1).
   JS removes .hidden when the gallery opens, and it stays
   visible on the final message page (Page 3) too. */
.mute-btn.hidden {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
    .mute-btn {
        background: var(--glass-bg);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }
}

.mute-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(255, 110, 199, 0.5);
}

.mute-btn:active {
    transform: scale(0.95);
}

/* ============================================= */
/* NEW: Ambient Sparkles                         */
/* Soft glowing dots drifting upward            */
/* ============================================= */
.sparkle {
    position: absolute;
    bottom: -20px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
    opacity: 0;
    animation: sparkleRise linear forwards;
    pointer-events: none;
}

@keyframes sparkleRise {
    0% {
        transform: translateY(0) scale(0.5);
        opacity: 0;
    }
    20% {
        opacity: 0.9;
    }
    80% {
        opacity: 0.7;
    }
    100% {
        transform: translateY(-100vh) scale(1.2);
        opacity: 0;
    }
}

/* ============================================= */
/* NEW: Signature / "Made with love" footer     */
/* ============================================= */
.signature {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-soft);
    opacity: 0.8;
    margin-top: 24px;
    letter-spacing: 0.3px;
}

.signature span {
    animation: heartbeat 1.6s ease-in-out infinite;
    display: inline-block;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    25%      { transform: scale(1.2); }
    40%      { transform: scale(1); }
}

/* ---------- Reduced motion preference ---------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}

/* ============================================= */
/* FEATURE 2: BIRTHDAY BLAST OVERLAY              */
/* Full-screen celebration burst shown for ~2.5s */
/* after clicking "Yes, It's Me ❤️"                */
/* ============================================= */
.blast-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
}

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

/* Central glow burst */
.blast-core {
    position: absolute;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.95) 0%, rgba(var(--accent-rgb), 0.6) 40%, transparent 70%);
    animation: blastCore 1.2s ease-out forwards;
}

@keyframes blastCore {
    0%   { width: 0; height: 0; opacity: 1; }
    50%  { width: 200vmax; height: 200vmax; opacity: 0.6; }
    100% { width: 250vmax; height: 250vmax; opacity: 0; }
}

/* Expanding rings */
.blast-ring {
    position: absolute;
    width: 0;
    height: 0;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.6);
    animation: blastRing 1.5s ease-out forwards;
}

.blast-ring-1 { animation-delay: 0s; }
.blast-ring-2 { animation-delay: 0.3s; }
.blast-ring-3 { animation-delay: 0.6s; }

@keyframes blastRing {
    0%   { width: 20px; height: 20px; opacity: 1; border-width: 4px; }
    100% { width: 120vmax; height: 120vmax; opacity: 0; border-width: 1px; }
}

/* Blast confetti pieces (created by JS, styled here) */
.blast-confetti {
    position: absolute;
    width: 10px;
    height: 14px;
    opacity: 0;
    animation: blastConfettiFly 1.8s ease-out forwards;
}

@keyframes blastConfettiFly {
    0% {
        transform: translate(0, 0) rotate(0deg) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(var(--bx, 0), var(--by, 0)) rotate(720deg) scale(0.5);
        opacity: 0;
    }
}

/* Blast hearts (created by JS) */
.blast-heart {
    position: absolute;
    font-size: 1.5rem;
    opacity: 0;
    animation: blastHeartFloat 2s ease-out forwards;
}

@keyframes blastHeartFloat {
    0%   { transform: translate(0, 0) scale(0.5); opacity: 1; }
    100% { transform: translate(var(--hx, 0), var(--hy, 0)) scale(1.5); opacity: 0; }
}

/* ============================================= */
/* FEATURE 4: AMBIENT DECORATIONS BEHIND PHOTOS   */
/* Hearts, sparkles, glowing circles, and tiny   */
/* stars that float BEHIND the photo frame.      */
/* z-index is 1 (below card at z-index 2).       */
/* ============================================= */
.ambient-decor {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 1;               /* FEATURE 4: behind the gallery card (z-index: 2) */
    pointer-events: none;
}

.ambient-decor .amb-heart {
    position: absolute;
    bottom: -30px;
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.6);
    text-shadow: 0 0 8px rgba(var(--accent-rgb), 0.5);
    animation: ambHeartRise linear infinite;
    pointer-events: none;
}

@keyframes ambHeartRise {
    0%   { transform: translateY(0) scale(0.8); opacity: 0; }
    15%  { opacity: 0.8; }
    85%  { opacity: 0.8; }
    100% { transform: translateY(-105vh) scale(1.1); opacity: 0; }
}

.ambient-decor .amb-sparkle {
    position: absolute;
    bottom: -20px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.7);
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
    animation: ambSparkleRise linear infinite;
    pointer-events: none;
}

@keyframes ambSparkleRise {
    0%   { transform: translateY(0) scale(0.4); opacity: 0; }
    20%  { opacity: 0.9; }
    80%  { opacity: 0.6; }
    100% { transform: translateY(-105vh) scale(1.2); opacity: 0; }
}

.ambient-decor .amb-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(20px);
    opacity: 0.35;
    animation: ambGlowDrift infinite ease-in-out;
    pointer-events: none;
}

@keyframes ambGlowDrift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33%      { transform: translate(30px, -20px) scale(1.2); }
    66%      { transform: translate(-20px, 30px) scale(0.9); }
}

.ambient-decor .amb-star {
    position: absolute;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    animation: ambStarTwinkle infinite ease-in-out;
    pointer-events: none;
}

@keyframes ambStarTwinkle {
    0%, 100% { opacity: 0.2; transform: scale(0.8); }
    50%      { opacity: 0.9; transform: scale(1.2); }
}

/* ============================================= */
/* FEATURE 8: FINAL MEMORY MESSAGE PAGE           */
/* ============================================= */
.final-card {
    position: relative;
    z-index: 2;
    background: var(--glass-fallback);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    box-shadow: 0 0 50px rgba(var(--accent-rgb), 0.4);
    max-width: 640px;
    width: 100%;
    text-align: center;
    padding: 52px 40px;
}

@supports (backdrop-filter: blur(16px)) or (-webkit-backdrop-filter: blur(16px)) {
    .final-card {
        background: var(--glass-bg);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }
}

.final-cake {
    font-size: 3.5rem;
    margin-bottom: 10px;
    animation: bob 2.6s ease-in-out infinite;
}

.final-title {
    font-size: clamp(1.8rem, 6vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 2px 20px rgba(var(--accent-rgb), 0.5);
}

.final-divider {
    width: 60%;
    max-width: 200px;
    height: 2px;
    margin: 0 auto 24px;
    background: linear-gradient(90deg, transparent, rgba(var(--accent-rgb), 0.8), transparent);
    border-radius: 2px;
}

.final-message {
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    line-height: 1.7;
    color: var(--text-soft);
    margin-bottom: 16px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

.final-highlight {
    font-size: clamp(1rem, 3vw, 1.25rem);
    font-weight: 600;
    color: #fff;
    margin-top: 20px;
}

.final-hearts {
    margin-top: 28px;
    position: relative;
    height: 60px;
    overflow: hidden;
}

/* Floating hearts inside final page (created by JS) */
.final-hearts .fh {
    position: absolute;
    bottom: 0;
    font-size: 1.4rem;
    animation: finalHeartFloat linear infinite;
    pointer-events: none;
}

@keyframes finalHeartFloat {
    0%   { transform: translateY(0) scale(0.6); opacity: 0; }
    20%  { opacity: 0.9; }
    100% { transform: translateY(-280px) scale(1.2); opacity: 0; }
}

/* ============================================= */
/* ENHANCEMENT 1: SLIDESHOW HINT MESSAGE           */
/* Subtle pulse, bottom-center, always visible     */
/* throughout the slideshow. Must not overlap      */
/* the photo frame.                                */
/* ============================================= */
.slideshow-hint {
    position: fixed;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.65);
    text-align: center;
    z-index: 50;
    pointer-events: none;
    white-space: nowrap;
    animation: hintPulse 3s ease-in-out infinite;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.2px;
}

@keyframes hintPulse {
    0%, 100% { opacity: 0.45; }
    50%      { opacity: 0.8; }
}

/* Hide hint on very small screens to prevent overflow */
@media (max-width: 380px) {
    .slideshow-hint {
        font-size: 0.68rem;
        bottom: 12px;
        white-space: normal;
        max-width: 90%;
    }
}
@media (max-width: 320px) {
    .slideshow-hint {
        font-size: 0.62rem;
        bottom: 8px;
    }
}

/* ============================================= */
/* ENHANCEMENT 3-5: MEMORY COLLAGE (final page)    */
/* Polaroid-style photo collage shown only when    */
/* hiddenSurpriseUnlocked = true. Reuses existing  */
/* slideshow photos with random order + rotation.  */
/* Hearts float around and behind it.              */
/* ============================================= */
.memory-collage {
    /* FIX: always visible so hearts show even without the surprise.
       Polaroid cards are hidden via .polaroid{display:none} until
       the collage gets .unlocked. */
    display: block;
    position: relative;
    z-index: 3;
    max-width: 540px;
    margin: 24px auto 8px;
    padding: 0;                  /* FIX: no padding so hearts fill edge-to-edge */
    min-height: 80px;            /* small when only hearts (no surprise) */
    overflow: hidden;            /* FIX: clip hearts WITHIN collage — no overflow below */
}

/* FIX: Hearts container fills the ENTIRE collage area as a
   background layer. Override the base .final-hearts which has
   margin-top:28px, height:60px, overflow:hidden — that created
   a separate strip BELOW the photos. Now hearts are absolutely
   positioned to cover the full collage, clipped by the parent. */
.memory-collage .collage-hearts {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;               /* fill entire collage area */
    margin: 0;                   /* override base .final-hearts margin-top:28px */
    overflow: hidden;            /* clip hearts at collage bounds */
    z-index: 1;                  /* behind polaroid cards (z-index: 2) */
    pointer-events: none;
}

/* FIX: hearts inside collage start from the bottom edge and float
   upward through the entire collage area, behind and between photos. */
.memory-collage .collage-hearts .fh {
    position: absolute;
    bottom: 0;
    font-size: 1.4rem;
    animation: finalHeartFloat linear infinite;
    pointer-events: none;
}

/* FIX: polaroid cards hidden by default — only appear when unlocked.
   z-index:2 keeps them ABOVE the hearts layer (z-index:1). */
.polaroid {
    display: none;
    position: absolute;
    width: 130px;
    background: #fff;
    padding: 8px 8px 24px;
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    z-index: 2;                 /* above collage-hearts (z-index: 1) */
}

/* FIX: polaroids become visible only when collage is unlocked */
.memory-collage.unlocked .polaroid {
    display: block;
    animation: polaroidDrop 0.8s ease both;
}

/* FIX: hover effect — only applies when polaroids are visible */
.memory-collage.unlocked .polaroid:hover {
    transform: scale(1.08) rotate(0deg) !important;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
    z-index: 10;
}

.polaroid img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 4px;
    display: block;
}

@keyframes polaroidDrop {
    from { opacity: 0; transform: translateY(-30px) scale(0.8); }
    to   { opacity: 1; }
}

/* ---- Responsive collage sizing ---- */
@media (max-width: 768px) {
    .polaroid { width: 110px; }
}
@media (max-width: 414px) {
    .polaroid { width: 95px; padding: 6px 6px 18px; }
}
@media (max-width: 390px) {
    .polaroid { width: 85px; }
}
@media (max-width: 375px) {
    .polaroid { width: 78px; padding: 5px 5px 14px; }
}
@media (max-width: 320px) {
    .polaroid { width: 68px; padding: 4px 4px 12px; }
}

/* ---------- Reduced motion preference ---------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}