/* =============================================================================
   CSS Variables & Design Tokens - Kawaii Scrapbook Theme
   ============================================================================= */
:root {
    /* Pastel Color Palette */
    --pink-soft: #f8e1e8;
    --pink-medium: #f4c7d4;
    --pink-dark: #e8a0b4;
    --pink-accent: #d4849c;
    --cream: #fffef8;
    --cream-pink: #fff5f7;
    --white: #ffffff;
    --brown-soft: #8b7355;
    --brown-text: #6b5344;
    --brown-light: #a08060;
    
    /* Font Stacks - Desktop uses cursive, mobile will override */
    --font-handwritten: "Brush Script MT", "Segoe Script", "Bradley Hand", cursive;
    --font-cute: "Comic Sans MS", "Chalkboard SE", "Marker Felt", sans-serif;
    
    /* Checkered Background */
    --check-color-1: #fff8fa;
    --check-color-2: #ffeef3;
    --check-size: 20px;
    
    /* Decorative */
    --border-dotted: #e8c0cc;
    --border-scallop: #f0d0d8;
    --shadow-soft: rgba(180, 140, 150, 0.15);
    --shadow-paper: rgba(139, 115, 85, 0.1);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Animation */
    --duration-slow: 600ms;
    --duration-base: 400ms;
    --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index */
    --z-base: 1;
    --z-content: 10;
    --z-header: 100;
    --z-modal: 1000;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* =============================================================================
   Base Styles
   ============================================================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: "Georgia", "Palatino Linotype", "Book Antiqua", serif;
    color: var(--brown-text);
    min-height: 100vh;
    line-height: 1.7;
    overflow-x: hidden;
    
    /* Checkered/Gingham Background Pattern */
    background-color: var(--check-color-1);
    background-image: 
        linear-gradient(45deg, var(--check-color-2) 25%, transparent 25%),
        linear-gradient(-45deg, var(--check-color-2) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--check-color-2) 75%),
        linear-gradient(-45deg, transparent 75%, var(--check-color-2) 75%);
    background-size: var(--check-size) var(--check-size);
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input {
    font-family: inherit;
}

*:focus {
    outline: none;
}

*:focus-visible {
    outline: 2px dashed var(--pink-accent);
    outline-offset: 3px;
}

/* =============================================================================
   Decorative Fonts
   ============================================================================= */
.font-title {
    font-family: var(--font-handwritten);
}

.font-handwritten {
    font-family: var(--font-cute);
}

/* =============================================================================
   PIN Screen - Diary Style
   ============================================================================= */
.pin-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    transition: transform var(--duration-slow) var(--ease-soft),
                opacity var(--duration-base) var(--ease-soft);
}

.pin-screen.unlocked {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

/* Decorative Corner Flourishes */
.pin-screen::before,
.pin-screen::after {
    content: '✿';
    position: absolute;
    font-size: 2rem;
    color: var(--pink-medium);
    opacity: 0.6;
}

.pin-screen::before {
    top: 30px;
    left: 30px;
}

.pin-screen::after {
    bottom: 30px;
    right: 30px;
}

.pin-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    max-width: 350px;
    width: 100%;
}

/* Title - Handwritten style like polaroid captions */
.pin-title {
    font-family: var(--font-handwritten);
    font-size: 2.8rem;
    font-weight: normal;
    color: var(--brown-text);
    text-align: center;
    position: relative;
    padding: var(--space-xs) var(--space-lg);
}

/* Decorative Frame */
.pin-frame {
    position: relative;
    padding: var(--space-lg);
    border: 3px double var(--pink-medium);
    border-radius: 15px;
    background: 
        linear-gradient(var(--cream-pink), var(--cream-pink)) padding-box,
        linear-gradient(135deg, var(--pink-soft), var(--pink-medium)) border-box;
    width: 100%;
}

/* PIN Display Dots */
.pin-display {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-md);
}

.pin-dot {
    width: 18px;
    height: 18px;
    border: 2px solid var(--pink-medium);
    border-radius: 50%;
    background: var(--white);
    transition: all 0.2s var(--ease-soft);
}

.pin-dot.filled {
    background: var(--pink-accent);
    border-color: var(--pink-dark);
    transform: scale(1.1);
}

.pin-error {
    font-family: var(--font-cute);
    color: #c47070;
    font-size: 0.85rem;
    min-height: 1.2rem;
    text-align: center;
    margin-bottom: var(--space-sm);
}

/* PIN Pad */
.pin-pad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 240px;
    margin: 0 auto;
}

.pin-key {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(180deg, var(--white) 0%, var(--cream) 100%);
    border: 2px solid var(--pink-medium);
    font-family: var(--font-cute);
    font-size: 1.4rem;
    color: var(--brown-text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s var(--ease-soft);
    box-shadow: 0 3px 0 var(--pink-dark), 0 4px 8px var(--shadow-soft);
}

.pin-key:hover:not(.pin-key-empty) {
    background: var(--pink-soft);
    transform: translateY(-2px);
    box-shadow: 0 5px 0 var(--pink-dark), 0 6px 12px var(--shadow-soft);
}

.pin-key:active:not(.pin-key-empty) {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--pink-dark), 0 2px 4px var(--shadow-soft);
}

.pin-key-empty {
    background: transparent;
    border: none;
    box-shadow: none;
    cursor: default;
}

.pin-key-delete {
    background: linear-gradient(180deg, var(--cream) 0%, var(--pink-soft) 100%);
}

.pin-key-delete svg {
    width: 22px;
    height: 22px;
    color: var(--brown-light);
}

.pin-pad.shake {
    animation: shake 0.4s var(--ease-soft);
}

@keyframes shake {
    0%, 100% { transform: translateX(0) rotate(0); }
    25% { transform: translateX(-8px) rotate(-1deg); }
    75% { transform: translateX(8px) rotate(1deg); }
}

/* Sticker-Style Submit Button */
.pin-submit {
    background: linear-gradient(135deg, var(--pink-soft) 0%, var(--pink-medium) 100%);
    color: var(--brown-text);
    padding: var(--space-md) var(--space-2xl);
    border-radius: 25px;
    font-family: var(--font-cute);
    font-size: 1rem;
    border: 2px solid var(--pink-dark);
    box-shadow: 
        0 3px 0 var(--pink-dark),
        0 5px 10px var(--shadow-soft);
    transition: all 0.2s var(--ease-soft);
    position: relative;
}

.pin-submit::before {
    content: '✧';
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
}

.pin-submit::after {
    content: '✧';
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
}

.pin-submit:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 5px 0 var(--pink-dark),
        0 8px 15px var(--shadow-soft);
}

.pin-submit:active {
    transform: translateY(2px);
    box-shadow: 
        0 1px 0 var(--pink-dark),
        0 2px 5px var(--shadow-soft);
}

/* Decorative Elements Around PIN */
.pin-deco {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    color: var(--pink-medium);
    font-size: 1.5rem;
    opacity: 0.7;
}

/* =============================================================================
   Main Screen
   ============================================================================= */
.main-screen {
    min-height: 100vh;
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-soft);
}

.main-screen.visible {
    opacity: 1;
}

/* =============================================================================
   Header - Compact Scrapbook Style
   ============================================================================= */
.main-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: linear-gradient(180deg, 
        rgba(255, 240, 245, 0.95) 0%,
        rgba(255, 245, 247, 0.9) 100%);
    border-bottom: 2px solid var(--pink-medium);
    padding: var(--space-sm) var(--space-lg);
    box-shadow: 0 2px 8px var(--shadow-soft);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.header-title {
    font-family: var(--font-handwritten);
    font-size: 1.4rem;
    font-weight: normal;
    color: var(--brown-light);
}

/* Cute Toggle Button */
.mode-toggle {
    background: var(--cream);
    color: var(--brown-text);
    padding: var(--space-xs) var(--space-md);
    border-radius: 15px;
    font-family: var(--font-cute);
    font-size: 0.8rem;
    border: 2px dotted var(--pink-medium);
    transition: all 0.3s var(--ease-soft);
}

.mode-toggle::before {
    content: '☆ ';
}

.mode-toggle:hover {
    background: var(--pink-soft);
    border-style: solid;
    transform: rotate(-2deg);
}

.header-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Cute Lock Button */
.lock-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--cream);
    border: 2px dotted var(--border-dotted);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brown-light);
    transition: all 0.3s var(--ease-soft);
    flex-shrink: 0;
}

.lock-btn:hover {
    background: var(--pink-soft);
    border-color: var(--pink-accent);
    transform: rotate(10deg);
}

.lock-btn svg {
    width: 16px;
    height: 16px;
}

/* =============================================================================
   Music Player - Wider with Time Slider
   ============================================================================= */
.music-player {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: linear-gradient(135deg, var(--cream) 0%, var(--cream-pink) 100%);
    padding: var(--space-sm) var(--space-md);
    border-radius: 12px;
    border: 2px solid var(--pink-soft);
    box-shadow: 
        inset 0 1px 0 rgba(255,255,255,0.8),
        0 2px 6px var(--shadow-soft);
    min-width: 320px;
}

.player-cover {
    width: 52px;
    height: 52px;
    border-radius: 6px;
    object-fit: cover;
    border: 2px solid var(--pink-medium);
    box-shadow: 0 2px 4px var(--shadow-paper);
    flex-shrink: 0;
}

.player-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    min-width: 0;
}

.player-title {
    font-family: var(--font-cute);
    font-size: 0.7rem;
    color: var(--brown-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-title::before {
    content: ' ♪   ';
    color: var(--pink-accent);
}

/* Time Row */
.player-time-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 2px 0;
}

.time-current,
.time-total {
    font-family: var(--font-cute);
    font-size: 0.6rem;
    color: var(--brown-light);
    min-width: 28px;
}

.time-current {
    text-align: right;
}

.time-total {
    text-align: left;
}

.time-slider {
    flex: 1;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--pink-soft);
    border-radius: 2px;
    border: 1px solid var(--border-dotted);
}

.time-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    background: linear-gradient(135deg, var(--pink-medium), var(--pink-accent));
    border-radius: 50%;
    border: 2px solid var(--white);
    cursor: pointer;
}

.time-slider::-moz-range-thumb {
    width: 10px;
    height: 10px;
    background: linear-gradient(135deg, var(--pink-medium), var(--pink-accent));
    border-radius: 50%;
    border: 2px solid var(--white);
    cursor: pointer;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 3px;
}

.player-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--white);
    border: 1px solid var(--border-dotted);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--pink-accent);
    transition: all 0.2s var(--ease-soft);
    flex-shrink: 0;
}

.player-btn:hover {
    background: var(--pink-soft);
    transform: scale(1.1);
}

.player-btn svg {
    width: 12px;
    height: 12px;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 3px;
    margin-left: 4px;
}

.volume-icon {
    width: 12px;
    height: 12px;
    color: var(--pink-accent);
}

.volume-slider {
    width: 80px;
    height: 3px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--pink-soft);
    border-radius: 2px;
    border: 1px solid var(--border-dotted);
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    background: linear-gradient(135deg, var(--pink-medium), var(--pink-accent));
    border-radius: 50%;
    border: 2px solid var(--white);
    cursor: pointer;
}

.volume-slider::-moz-range-thumb {
    width: 10px;
    height: 10px;
    background: linear-gradient(135deg, var(--pink-medium), var(--pink-accent));
    border-radius: 50%;
    border: 2px solid var(--white);
    cursor: pointer;
}

/* =============================================================================
   Main Content
   ============================================================================= */
.main-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

/* =============================================================================
   Timeline View
   ============================================================================= */
.timeline-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    padding: var(--space-lg) 0;
}

.timeline-stage {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    width: 100%;
    justify-content: center;
}

/* Cute Navigation Arrows */
.nav-arrow {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--cream);
    border: 2px dashed var(--pink-medium);
    box-shadow: 0 3px 8px var(--shadow-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--pink-accent);
    transition: all 0.3s var(--ease-soft);
    flex-shrink: 0;
}

.nav-arrow:hover:not(:disabled) {
    background: var(--pink-soft);
    border-style: solid;
    transform: scale(1.1) rotate(-5deg);
}

.nav-arrow:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.nav-arrow svg {
    width: 28px;
    height: 28px;
}

.polaroid-container {
    flex: 1;
    display: flex;
    justify-content: center;
    min-height: 450px;
}

/* =============================================================================
   Polaroid Card - Scrapbook Style
   ============================================================================= */
.polaroid {
    background: linear-gradient(180deg, #f5f5f5 0%, #e8e8e8 100%);
    padding: 14px 14px 70px 14px;
    border-radius: 2px;
    box-shadow: 
        0 4px 8px var(--shadow-paper),
        0 8px 16px var(--shadow-soft),
        inset 0 0 0 1px rgba(0,0,0,0.05);
    cursor: pointer;
    transition: transform 0.4s var(--ease-soft),
                box-shadow 0.4s var(--ease-soft);
    position: relative;
    max-width: 340px;
    width: 100%;
    transform: rotate(var(--rotation, 0deg));
}

.polaroid::before,
.polaroid::after {
    content: '';
    position: absolute;
    width: 55px;
    height: 20px;
    background: linear-gradient(180deg, 
        rgba(255, 248, 220, 0.85) 0%, 
        rgba(255, 240, 200, 0.8) 100%);
    top: -6px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    z-index: 2;
}

.polaroid::before {
    left: 20px;
    transform: rotate(-5deg);
}

.polaroid::after {
    right: 20px;
    transform: rotate(4deg);
}

.polaroid:hover,
.polaroid:focus {
    transform: translateY(-10px) rotate(0deg) scale(1.02);
    box-shadow: 
        0 12px 24px var(--shadow-paper),
        0 20px 40px var(--shadow-soft);
}

.polaroid-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
    background: #fff;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.08);
    margin-bottom: 0;
}

.polaroid-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.polaroid-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--brown-light);
    font-family: var(--font-cute);
    font-size: 0.85rem;
    background: 
        linear-gradient(45deg, var(--cream-pink) 25%, transparent 25%),
        linear-gradient(-45deg, var(--cream-pink) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--cream-pink) 75%),
        linear-gradient(-45deg, transparent 75%, var(--cream-pink) 75%),
        var(--cream);
    background-size: 10px 10px;
}

.polaroid-placeholder svg {
    width: 40px;
    height: 40px;
    margin-bottom: var(--space-sm);
    opacity: 0.5;
    color: var(--pink-medium);
}

.polaroid-caption {
    font-family: var(--font-handwritten);
    font-size: 1.5rem;
    color: var(--brown-text);
    text-align: center;
    line-height: 1.4;
    margin-top: 20px;
    padding: 0 var(--space-md);
    min-height: 40px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

/* =============================================================================
   View All Grid
   ============================================================================= */
.view-all {
    padding: var(--space-xl) 0;
}

.view-all-title {
    text-align: center;
    font-family: var(--font-handwritten);
    font-size: 2.2rem;
    font-weight: normal;
    color: var(--pink-accent);
    margin-bottom: var(--space-xl);
    position: relative;
    display: inline-block;
    width: 100%;
}

.view-all-title::before,
.view-all-title::after {
    content: '· · · · · ·';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.8rem;
    color: var(--pink-medium);
    letter-spacing: 4px;
}

.view-all-title::before {
    left: 10%;
}

.view-all-title::after {
    right: 10%;
}

.polaroid-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-2xl);
    max-width: 950px;
    margin: 0 auto;
}

.polaroid-grid .polaroid {
    animation: fadeInUp 0.5s var(--ease-soft) both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px) rotate(var(--rotation, 0deg));
    }
    to {
        opacity: 1;
        transform: translateY(0) rotate(var(--rotation, 0deg));
    }
}

.polaroid-grid .polaroid:nth-child(1) { animation-delay: 0ms; }
.polaroid-grid .polaroid:nth-child(2) { animation-delay: 80ms; }
.polaroid-grid .polaroid:nth-child(3) { animation-delay: 160ms; }
.polaroid-grid .polaroid:nth-child(4) { animation-delay: 240ms; }
.polaroid-grid .polaroid:nth-child(5) { animation-delay: 320ms; }
.polaroid-grid .polaroid:nth-child(6) { animation-delay: 400ms; }

/* =============================================================================
   Welcome Slide - First Slide (Sticky Note)
   ============================================================================= */
.welcome-slide {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 340px;
    width: 100%;
    min-height: 400px;
    animation: fadeInUp 0.5s var(--ease-soft);
}

.sticky-note {
    background: linear-gradient(135deg, #fff9c4 0%, #fff59d 100%);
    padding: var(--space-2xl) var(--space-xl);
    border-radius: 3px;
    box-shadow: 
        0 4px 8px var(--shadow-paper),
        0 8px 16px var(--shadow-soft),
        4px 4px 0 rgba(0, 0, 0, 0.05);
    position: relative;
    transform: rotate(-2deg);
    min-width: 280px;
}

.sticky-note::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 20px;
    background: linear-gradient(180deg, 
        rgba(255, 248, 220, 0.9) 0%, 
        rgba(255, 240, 200, 0.85) 100%);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sticky-note-content {
    text-align: center;
}

.sticky-title {
    font-family: var(--font-handwritten);
    font-size: 2.2rem;
    color: var(--brown-text);
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

.sticky-subtitle {
    font-family: var(--font-handwritten);
    font-size: 1.3rem;
    color: var(--brown-light);
    line-height: 1.4;
}

/* =============================================================================
   Letter Slide - Final Slide in Timeline
   ============================================================================= */
.letter-slide {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 340px;
    width: 100%;
    min-height: 400px;
    animation: fadeInUp 0.5s var(--ease-soft);
}

.letter-slide-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    text-align: center;
}

.letter-slide-deco {
    font-size: 0.7rem;
    color: var(--pink-medium);
    letter-spacing: 3px;
}

/* Letter CTA at bottom of View All page */
.letter-cta-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    text-align: center;
    margin-top: var(--space-3xl);
    padding: var(--space-2xl) 0;
}

.letter-btn {
    background: linear-gradient(180deg, var(--cream) 0%, var(--cream-pink) 100%);
    color: var(--brown-text);
    padding: var(--space-md) var(--space-2xl);
    border-radius: 8px;
    font-family: var(--font-cute);
    font-size: 1rem;
    border: 2px solid var(--pink-medium);
    box-shadow: 
        0 4px 0 var(--pink-dark),
        0 6px 12px var(--shadow-soft);
    display: inline-flex;
    align-items: center;
    gap: var(--space-md);
    transition: all 0.3s var(--ease-soft);
    position: relative;
}

.letter-btn::before {
    content: '✉';
    font-size: 1.2rem;
}

.letter-btn:hover {
    transform: translateY(-3px) rotate(-2deg);
    box-shadow: 
        0 6px 0 var(--pink-dark),
        0 10px 20px var(--shadow-soft);
}

.letter-btn:active {
    transform: translateY(2px);
    box-shadow: 
        0 2px 0 var(--pink-dark),
        0 4px 8px var(--shadow-soft);
}

/* =============================================================================
   Modal Overlay
   ============================================================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(244, 199, 212, 0.4);
    backdrop-filter: blur(3px);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    opacity: 0;
    transition: opacity 0.4s var(--ease-soft);
}

.modal-overlay.active {
    opacity: 1;
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--cream);
    border: 2px dotted var(--pink-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brown-text);
    transition: all 0.3s var(--ease-soft);
    z-index: 10;
}

.modal-close:hover {
    background: var(--pink-soft);
    transform: rotate(90deg);
}

.modal-close svg {
    width: 20px;
    height: 20px;
}

/* =============================================================================
   Image Modal
   ============================================================================= */
.image-modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    background: linear-gradient(180deg, var(--white) 0%, var(--cream) 100%);
    border-radius: 8px;
    padding: var(--space-lg);
    border: 3px double var(--pink-medium);
    box-shadow: 0 20px 60px var(--shadow-soft);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    animation: modalPop 0.4s var(--ease-soft);
}

@keyframes modalPop {
    from {
        opacity: 0;
        transform: scale(0.9) rotate(-2deg);
    }
    to {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

.modal-image {
    max-width: 100%;
    max-height: 65vh;
    object-fit: contain;
    border: 1px solid var(--border-dotted);
    box-shadow: 0 4px 12px var(--shadow-paper);
}

.modal-caption {
    font-family: var(--font-handwritten);
    font-size: 1.3rem;
    color: var(--brown-text);
    text-align: center;
}

/* =============================================================================
   Letter Modal
   ============================================================================= */
.letter-modal-content {
    position: relative;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    animation: modalPop 0.4s var(--ease-soft);
}

.modal-close-letter {
    position: absolute;
    top: -15px;
    right: 20px;
    width: auto;
    height: auto;
    border-radius: 15px;
    background: linear-gradient(135deg, var(--pink-soft), var(--pink-medium));
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-cute);
    font-size: 0.85rem;
    border: 2px solid var(--pink-dark);
    color: var(--brown-text);
}

.modal-close-letter::before {
    content: '← ';
}

.modal-close-letter:hover {
    transform: scale(1.05);
}

.letter-paper {
    background: 
        repeating-linear-gradient(
            var(--cream) 0px,
            var(--cream) 28px,
            #f0e8dc 28px,
            #f0e8dc 29px
        );
    border-radius: 5px;
    padding: var(--space-2xl);
    border: 2px solid var(--pink-soft);
    box-shadow: 
        0 10px 30px var(--shadow-paper),
        inset 0 0 60px rgba(255,250,240,0.5);
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.letter-paper::before {
    content: '';
    position: absolute;
    left: 50px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(255, 180, 180, 0.3);
}

.letter-title {
    font-family: var(--font-handwritten);
    font-size: 2rem;
    font-weight: normal;
    color: var(--pink-accent);
    text-align: center;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 1px dashed var(--border-dotted);
}

.letter-title::before,
.letter-title::after {
    content: ' ♡ ';
}

.letter-text {
    font-family: var(--font-cute);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--brown-text);
    white-space: pre-line;
    padding-left: 30px;
}

/* =============================================================================
   Responsive Design
   ============================================================================= */
@media (max-width: 768px) {
    :root {
        --check-size: 15px;
        /* Use more readable fonts on mobile - same style as desktop but better mobile support */
        --font-handwritten: "Segoe Script", "Bradley Hand", "Snell Roundhand", Georgia, cursive;
        --font-cute: "Trebuchet MS", "Avenir Next", "Segoe UI", sans-serif;
    }
    
    .pin-title {
        font-size: 1.8rem;
    }
    
    .pin-key {
        width: 52px;
        height: 52px;
        font-size: 1.2rem;
    }
    
    .header-content {
        gap: var(--space-sm);
    }
    
    .header-title {
        font-size: 1.2rem;
    }
    
    .music-player {
        min-width: 260px;
        padding: var(--space-xs) var(--space-sm);
    }
    
    .player-cover {
        width: 35px;
        height: 35px;
    }
    
    .timeline-stage {
        gap: var(--space-md);
    }
    
    .nav-arrow {
        width: 44px;
        height: 44px;
    }
    
    .polaroid-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .letter-paper {
        padding: var(--space-xl) var(--space-lg);
    }
    
    .letter-paper::before {
        left: 25px;
    }
    
    .letter-text {
        padding-left: 15px;
    }
}

@media (max-width: 480px) {
    .pin-pad {
        max-width: 200px;
    }
    
    .pin-key {
        width: 48px;
        height: 48px;
        font-size: 1.1rem;
    }
    
    .volume-control {
        display: none;
    }
    
    .music-player {
        min-width: 200px;
    }
    
    .view-all-title::before,
    .view-all-title::after {
        display: none;
    }
}

/* =============================================================================
   Utility
   ============================================================================= */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}