/* ==========================================
   CSS STYLING FOR ANNIVERSARY WEB APP
   Premium Glassmorphism & Romantic Theme
   ========================================== */

/* Custom CSS Variables */
:root {
    --primary-color: #e63946;
    --primary-hover: #ff4d6d;
    --secondary-color: #9b2226;
    --bg-gradient: linear-gradient(135deg, #050505 0%, #120808 50%, #1a0a0a 100%);
    --card-bg: rgba(18, 18, 18, 0.75);
    --card-border: rgba(255, 255, 255, 0.09);
    --card-shadow: 0 20px 45px rgba(0, 0, 0, 0.85);
    --text-primary: #ffffff;
    --text-secondary: #f1faee;
    --text-muted: #a8a8b3;
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    --font-handwritten: 'Sacramento', cursive;
}

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

html {
    scroll-behavior: smooth;
    font-family: var(--font-body);
    color: var(--text-primary);
    background-color: #0d0c1d;
    overflow-x: hidden;
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #0d0c1d;
}
::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

/* Background Hearts Canvas */
#heartsCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Music Control Button */
.music-toggle {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.music-toggle:hover {
    transform: scale(1.1);
    color: var(--primary-hover);
    box-shadow: 0 0 15px rgba(230, 57, 70, 0.4);
    border-color: rgba(230, 57, 70, 0.3);
}

.music-toggle.playing i {
    animation: spin 4s linear infinite;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

/* 1. ENVELOPE / SPLASH SCREEN */
.envelope-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-gradient);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 1s cubic-bezier(0.445, 0.05, 0.55, 0.95), visibility 1s;
}

.envelope-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.envelope-container {
    text-align: center;
    width: 90%;
    max-width: 450px;
}

.envelope-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    height: 250px;
    border-radius: 20px;
    position: relative;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.envelope-card:hover {
    transform: translateY(-5px);
}

.envelope-front {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.heart-seal {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    box-shadow: 0 0 25px rgba(230, 57, 70, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.heart-seal:hover {
    transform: scale(1.1);
    box-shadow: 0 0 35px rgba(230, 57, 70, 0.8);
}

.seal-icon {
    width: 32px;
    height: 32px;
    fill: white;
}

.seal-text {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 6px;
    font-family: var(--font-body);
}

.envelope-instruction {
    margin-top: 25px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-style: italic;
    animation: pulseText 2s infinite ease-in-out;
}

@keyframes pulseText {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* MAIN APP WRAPPER */
.main-content {
    opacity: 1;
    transition: opacity 1.5s ease-in-out;
    z-index: 10;
    position: relative;
    width: 100%;
}

.main-content.hide {
    display: none;
    opacity: 0;
}

/* Global Sections & Container Layout */
.section {
    padding: 80px 0;
    width: 100%;
}

.container {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 8px;
    color: #fff;
    text-shadow: 0 2px 10px rgba(230, 57, 70, 0.2);
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 45px;
    font-style: italic;
}

/* Glassmorphism utility class */
.glass {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* HERO / HEADER SECTION */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 20px;
}

.hero-glass {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 30px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 60px 40px;
    text-align: center;
    width: 100%;
    max-width: 650px;
    animation: floatUp 1.2s ease-out;
}

@keyframes floatUp {
    0% { transform: translateY(40px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

.love-badge {
    background: rgba(230, 57, 70, 0.15);
    border: 1px solid rgba(230, 57, 70, 0.3);
    color: var(--primary-hover);
    padding: 8px 18px;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 25px;
}

.badge-icon {
    width: 16px;
    height: 16px;
    fill: var(--primary-hover);
}

.pulse {
    animation: heartPulse 1.2s infinite alternate;
}

@keyframes heartPulse {
    100% { transform: scale(1.25); }
}

.couple-names {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #fff 30%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.anniversary-date {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.arrow-down-indicator {
    margin-top: 50px;
    color: var(--text-muted);
    animation: bounceDown 1.8s infinite;
}

@keyframes bounceDown {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* COUNT UP TIMER SECTION */
.counter-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    width: 100%;
    margin-bottom: 20px;
}

.counter-card {
    padding: 30px 20px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.counter-card:hover {
    transform: scale(1.03);
    border-color: rgba(230, 57, 70, 0.25);
}

.counter-num {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-hover);
    line-height: 1;
    margin-bottom: 8px;
    text-shadow: 0 0 15px rgba(230, 57, 70, 0.3);
}

.counter-lbl {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 500;
}

/* Smaller details subgrid */
.counter-subgrid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    width: 80%;
}

.counter-card.small {
    padding: 15px 10px;
}

.counter-num-sm {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.counter-lbl-sm {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* LOVE LETTER / MESSAGE SECTION */
.letter-glass {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 50px;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.letter-glass::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.letter-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 20px;
}

.letter-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-hover);
}

.letter-header h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
}

.letter-body {
    min-height: 180px;
    margin-bottom: 30px;
}

.typing-text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-secondary);
    font-family: var(--font-body);
    white-space: pre-line;
}

/* Cursor typing animation */
.typing-text::after {
    content: '|';
    color: var(--primary-color);
    animation: blinkCursor 0.8s infinite steps(2);
    font-weight: bold;
}

@keyframes blinkCursor {
    from, to { opacity: 0; }
    50% { opacity: 1; }
}

.letter-footer {
    text-align: right;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 20px;
}

.signature {
    font-family: var(--font-handwritten);
    font-size: 2.2rem;
    color: var(--primary-hover);
    line-height: 1;
    margin-bottom: 5px;
}

.sender-name {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* TIMELINE SECTION */
.timeline {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin-top: 20px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, rgba(230, 57, 70, 0) 0%, var(--primary-color) 15%, var(--primary-color) 85%, rgba(230, 57, 70, 0) 100%);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 50%;
    position: relative;
    margin-bottom: 50px;
    width: 100%;
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 50%;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 15px;
    transform: translateX(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-hover);
    border: 1px solid var(--card-border);
    transition: all 0.3s ease;
}

.timeline-dot i {
    width: 18px;
    height: 18px;
}

.timeline-item:hover .timeline-dot {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 0 15px var(--primary-color);
    transform: translateX(-50%) scale(1.1);
}

.timeline-content {
    width: 88%;
    padding: 30px;
    transition: all 0.3s ease;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: 30px;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: 30px;
}

.timeline-content:hover {
    transform: translateY(-5px);
    border-color: rgba(230, 57, 70, 0.25);
}

.timeline-date {
    display: inline-block;
    background: rgba(230, 57, 70, 0.15);
    border: 1px solid rgba(230, 57, 70, 0.25);
    color: var(--primary-hover);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.timeline-content h4 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #fff;
}

.timeline-content p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
}

/* PHOTO GALLERY SECTION */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    width: 100%;
    max-width: 800px;
}

.gallery-item {
    overflow: hidden;
    padding: 12px;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.gallery-img-wrapper {
    width: 100%;
    height: 250px;
    overflow: hidden;
    border-radius: 12px;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.gallery-info {
    padding-top: 15px;
    text-align: center;
}

.gallery-info span {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-secondary);
}

.gallery-item:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(230, 57, 70, 0.3);
}

.gallery-item:hover img {
    transform: scale(1.08);
}

/* APP FOOTER */
.app-footer {
    margin-top: auto;
    padding: 50px 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    background: rgba(5, 5, 5, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    width: 100%;
    z-index: 10;
}

.app-footer p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.footer-heart {
    width: 16px;
    height: 16px;
    fill: var(--primary-color);
    color: var(--primary-color);
    animation: heartPulse 1.2s infinite alternate;
}

.app-footer .copyright {
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================
   MEDIA QUERIES (RESPONSIVE STYLING)
   ========================================== */

@media (max-width: 768px) {
    /* Main Layout */
    .section {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    /* Hero */
    .couple-names {
        font-size: 2.5rem;
    }
    
    .anniversary-date {
        font-size: 1rem;
        letter-spacing: 2px;
    }
    
    /* Counter */
    .counter-grid {
        gap: 12px;
    }
    
    .counter-num {
        font-size: 2.2rem;
    }
    
    .counter-lbl {
        font-size: 0.8rem;
    }
    
    .counter-subgrid {
        width: 100%;
        gap: 10px;
    }
    
    .counter-num-sm {
        font-size: 1.4rem;
    }
    
    /* Letter */
    .letter-glass {
        padding: 30px 20px;
    }
    
    .typing-text {
        font-size: 1.05rem;
        line-height: 1.6;
    }
    
    /* Timeline */
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-right: 0;
        padding-left: 50px;
        justify-content: flex-start;
        margin-bottom: 35px;
    }
    
    .timeline-item:nth-child(even) {
        padding-left: 50px;
    }
    
    .timeline-dot {
        left: 20px;
        width: 36px;
        height: 36px;
    }
    
    .timeline-content {
        width: 100%;
        padding: 20px;
    }
    
    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        margin-left: 10px;
        margin-right: 0;
    }
    
    /* Gallery */
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .gallery-img-wrapper {
        height: 220px;
    }
}