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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #ffffff;
    /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    margin: 0;
    width: 100%;
    overflow-x: hidden;
}

.container {
    perspective: 1000px;
    width: 100%;
    max-width: 600px;
    overflow: visible;
    margin: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.card {
    position: relative;
    width: 100%;
    height: 480px;
    max-height: calc(100vh - 40px);
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    margin: auto;
    overflow: visible;
}

.card.opened {
    height: auto;
    min-height: 480px;
    max-height: none;
}

.card.opened {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.card-front {
    overflow: hidden;
}

.card-back {
    overflow: visible;
}

.card-front {
    background: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    box-shadow: none;
    border-radius: 0;
    overflow: hidden;
}

.card-back {
    background: transparent;
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    border-radius: 20px;
    /* box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3); */
    transition: opacity 0.5s ease, transform 0.5s ease;
    min-height: 480px;
    height: 100%;
}

.card.opened .card-back {
    height: calc(100vh - 40px);
    max-height: calc(100vh - 40px);
}

.card-back.hidden {
    opacity: 0;
    pointer-events: none;
    z-index: 1;
}

/* Hiệu ứng tuyết rơi */
.snow-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 50;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.card.opened .snow-container {
    opacity: 1;
}

.snowflake {
    position: absolute;
    top: -20px;
    color: #ffffff;
    font-size: 1em;
    font-family: Arial, sans-serif;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.9),
                 0 0 15px rgba(255, 255, 255, 0.5);
    user-select: none;
    pointer-events: none;
    animation: snowfall linear infinite;
    opacity: 0.9;
    will-change: transform, opacity;
}

@keyframes snowfall {
    0% {
        transform: translateY(0) translateX(0) rotate(0deg);
        opacity: 0.9;
    }
    25% {
        opacity: 1;
    }
    50% {
        opacity: 0.95;
    }
    75% {
        opacity: 0.8;
    }
    100% {
        transform: translateY(calc(100vh + 20px)) translateX(var(--drift)) rotate(360deg);
        opacity: 0.2;
    }
}

/* Các kích thước tuyết khác nhau */
.snowflake.small {
    font-size: 0.7em;
    animation-duration: 8s;
    animation-delay: 0s;
    opacity: 0.7;
}

.snowflake.medium {
    font-size: 1em;
    animation-duration: 10s;
    animation-delay: 0.3s;
    opacity: 0.85;
}

.snowflake.large {
    font-size: 1.4em;
    animation-duration: 12s;
    animation-delay: 0.6s;
    opacity: 0.9;
}

.snowflake.xlarge {
    font-size: 1.8em;
    animation-duration: 15s;
    animation-delay: 0.9s;
    opacity: 0.95;
}

/* Thiep Scroll Container */
.thiep-scroll-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    padding-bottom: 80px;
    scroll-snap-type: y proximity;
    /* Tối ưu cho mobile */
    -webkit-tap-highlight-color: transparent;
    touch-action: pan-y;
}

@media (max-width: 650px) {
    .thiep-scroll-container {
        scroll-snap-type: none; /* Tắt snap trên mobile để scroll mượt hơn */
    }
}

.thiep-scroll-container::-webkit-scrollbar {
    width: 4px;
}

.thiep-scroll-container::-webkit-scrollbar-track {
    background: transparent;
}

.thiep-scroll-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
}

.thiep-scroll-container::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}

/* Thiep Sections */
.thiep-section {
    width: 100%;
    min-height: 480px;
    height: calc(100vh - 40px);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    opacity: 0;
    transform: translateY(50px) scale(0.9);
    transition: opacity 1s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 1s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 20px;
    box-sizing: border-box;
    will-change: transform, opacity;
    scroll-snap-align: start;
    scroll-snap-stop: always;
}

.thiep-section.active {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.thiep-section.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Hiệu ứng khi section đang trong viewport */
.thiep-section.scrolling-in {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.thiep-section.scrolling-out {
    opacity: 0.7;
    transform: translateY(-20px) scale(0.95);
}

.thiep-image {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
   
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                filter 0.6s ease;
    transform-origin: center center;
    will-change: transform;
    /* box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2); */
}

/* Hiệu ứng parallax cho ảnh khi scroll */
.thiep-section.visible .thiep-image {
    animation: imageReveal 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes imageReveal {
    0% {
        opacity: 0;
        transform: scale(0.85) translateY(20px);
        filter: blur(5px) brightness(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
        filter: blur(0) brightness(1);
    }
}

/* Hiệu ứng khi scroll qua section */
.thiep-section.scroll-past .thiep-image {
    transform: scale(0.9) translateY(-10px);
    opacity: 0.6;
    filter: brightness(0.7);
}

/* Hiệu ứng glow khi section ở giữa viewport */
.thiep-section.scrolling-in .thiep-image {
    filter: brightness(1.05) drop-shadow(0 0 20px rgba(255, 255, 255, 0.3));
    transition: filter 0.6s ease, transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Hiệu ứng khi section đang scroll vào */
.thiep-section.scrolling-out .thiep-image {
    filter: brightness(0.9);
    transition: filter 0.6s ease, transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Scroll Indicator for Thiep */
.scroll-indicator-thiep {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    font-weight: bold;
    pointer-events: none;
    opacity: 1;
    animation: bounce 2s ease-in-out infinite;
    z-index: 100;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    background: rgba(0, 0, 0, 0.2);
    padding: 8px 16px;
    border-radius: 20px;
    backdrop-filter: blur(5px);
}

.scroll-indicator-thiep.hidden {
    opacity: 0;
    transition: opacity 0.3s ease;
}


@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.card-content {
    text-align: center;
    width: 100%;
    background: transparent;
}

/* Envelope styles */
.envelope-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.5s ease-in;
    min-height: 400px;
    padding: 0 10px;
    box-sizing: border-box;
}

.envelope {
    position: relative;
    width: 280px;
    height: 200px;
    cursor: pointer;
    animation: envelopeFloat 3s ease-in-out infinite;
    transform-style: preserve-3d;
    perspective: 1000px;
}

.envelope-body {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 140px;
    background: linear-gradient(135deg, #fdd7d2 0%, #fff2f0 100%);
    border-radius: 0px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
    padding: 10px;
    box-sizing: border-box;
    /* outline: 20px solid #ffe1e1; */
    overflow: visible;
}


.envelope-message {
    color: #5a3d5c;
    font-size: 18px;
    font-weight: bold;
    text-align: center;
    padding: 20px;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.envelope-name {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 18px;
    font-weight: bold;
    font-family: "Imperial Script", cursive;
    text-align: center;
    z-index: 10;
    padding: 10px 18px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(8px);
    white-space: nowrap;
    max-width: 85%;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0;
    transition: opacity 0.5s ease-in 0.5s;
    border: 2px solid rgba(255, 107, 157, 0.3);
    
    /* 🌈 CHỮ GRADIENT ĐỎ → HỒNG */
    background: linear-gradient(90deg, #a81919, #ff648b);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    
    
}

.envelope-container.opened .envelope-name {
    opacity: 1;
}

.envelope-image {
    max-width: 170%;
    height: 100%;
    /* max-height: 50px; */
    object-fit: contain;
    position: relative;
    z-index: 1;
    margin-bottom: 5px;
    opacity: 0;
    transition: opacity 0.5s ease-in 0.8s;
}

.envelope-container.opened .envelope-image {
    opacity: 1;
}

.envelope-flowers {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 30px;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    padding: 0 20px;
}

.envelope-container.opened .envelope-flowers {
    opacity: 1;
    animation: flowersGrow 1s ease-out 0.3s both;
}

.envelope-flower {
    width: 150px;
    height: auto;
    transform: translateY(100px) scale(0.2);
    transition: transform 1s ease-out;
    opacity: 0;
    z-index: 10;
    filter: drop-shadow(0 5px 15px rgba(0, 0, 0, 0.3));
}

.envelope-flower-left {
    animation: flowerGrowLeft 1.2s ease-out 0.5s both;
}

.envelope-flower-right {
    animation: flowerGrowRight 1.2s ease-out 0.7s both;
}

.envelope-container.opened .envelope-flower-left {
    transform: translateY(0) scale(1.2) rotate(-10deg);
    opacity: 1;
}

.envelope-container.opened .envelope-flower-right {
    transform: translateY(0) scale(1.2) rotate(10deg);
    opacity: 1;
}

@keyframes flowersGrow {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes flowerGrowLeft {
    0% {
        transform: translateY(100px) scale(0.1) rotate(-10deg);
        opacity: 0;
    }
    50% {
        transform: translateY(50px) scale(0.6) rotate(-8deg);
        opacity: 0.7;
    }
    100% {
        transform: translateY(0) scale(1.2) rotate(-10deg);
        opacity: 1;
    }
}

@keyframes flowerGrowRight {
    0% {
        transform: translateY(100px) scale(0.1) rotate(10deg);
        opacity: 0;
    }
    50% {
        transform: translateY(50px) scale(0.6) rotate(8deg);
        opacity: 0.7;
    }
    100% {
        transform: translateY(0) scale(1.2) rotate(10deg);
        opacity: 1;
    }
}

.envelope-flap {
    position: absolute;
    top: 40px;
    left: 50%;
    transform: translateX(-50%) translateY(0);
    width: 100%;
    height: 80px;
    background: linear-gradient(135deg, #ffe4e9 0%, #ffeef5 100%);
    transform-origin: bottom center;
    transition: transform 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55), clip-path 0.8s ease;
    z-index: 3;
    box-shadow: 0 -5px 20px rgba(0.9, 0.9, 0.9, 0);
    clip-path: polygon(0% 0%, 50% 100%, 100% 0%);
    -webkit-clip-path: polygon(0% 0%, 50% 100%, 100% 0%);
}

.envelope-flap.opened {
    transform: translateX(-50%) translateY(-80px);
    clip-path: polygon(0% 100%, 50% 0%, 100% 100%);
    -webkit-clip-path: polygon(0% 100%, 50% 0%, 100% 100%);
}

.envelope-heart {
    position: absolute;
    top: 10px;
    left: 47%;
    transform: translateX(-50%);
    font-size: 20px;
    animation: heartbeat 3.5s ease-in-out infinite;
    z-index: 4;
    
}

.envelope-flap.opened .envelope-heart {
    top: auto;
    bottom: 10px;
    transform: translateX(-50%);
}

.envelope-hint {
    margin-top: 220px;
    font-size: 14px;
    color: #7a5a7c;
    font-style: italic;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes envelopeFloat {
    0%, 100% {
        transform: translateY(0px) rotate(-2deg);
    }
    50% {
        transform: translateY(-10px) rotate(2deg);
    }
}

.envelope-container.opened .envelope {
    animation: none;
}

.shin-c-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.5s ease-in;
    background: transparent;
    position: relative;
}

/* Tên khách mời bên ngoài thiệp */
.guest-name-outside {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: #5a3d5c;
    font-size: 24px;
    font-weight: bold;
    font-family: "Imperial Script", cursive;
    text-align: center;
    z-index: 100;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    white-space: nowrap;
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    border: 2px solid rgba(255, 107, 157, 0.4);
    display: none;
    animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Tên khách mời bên trong thiệp */
.guest-name-inside {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 22px;
    font-weight: bold;
    font-family: "Imperial Script", cursive;
    text-align: center;
    z-index: 100;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    white-space: nowrap;
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    border: 2px solid rgba(255, 107, 157, 0.4);
    display: none;
    animation: fadeInDown 0.8s ease-out 0.3s both;
    letter-spacing: 3px;
    
 
    background: linear-gradient(90deg, #a81919, #ff648b);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    
}

.shin-c-image {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: none;
    animation: float 3s ease-in-out infinite;
    background: transparent;
}

.shin-c-image:hover {
    transform: scale(1.05);
    box-shadow: none;
}

.shin-c-image:active {
    transform: scale(0.98);
}

.click-hint {
    color: #5a3d5c;
    margin-top: 20px;
    font-size: 16px;
    font-style: italic;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.password-section {
    width: 100%;
    animation: fadeIn 0.5s ease-in;
}

.password-title {
    font-size: 24px;
    color: #5a3d5c;
    margin-bottom: 20px;
    font-weight: bold;
}

.password-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.password-input {
    width: 60px;
    height: 60px;
    font-size: 32px;
    text-align: center;
    border: 3px solid #ff6b9d;
    border-radius: 15px;
    background: white;
    color: #5a3d5c;
    font-weight: bold;
    transition: all 0.3s ease;
    outline: none;
}

.password-input:focus {
    border-color: #c44569;
    box-shadow: 0 0 15px rgba(255, 107, 157, 0.5);
    transform: scale(1.1);
}

.password-input.error {
    border-color: #ff4757;
    background-color: #ffe0e0;
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.error-message {
    color: #ff4757;
    font-size: 14px;
    min-height: 20px;
    margin-bottom: 15px;
    font-weight: bold;
}

.ribbon {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
    position: relative;
}

.ribbon-left,
.ribbon-right {
    width: 0;
    height: 0;
    border-style: solid;
}

.ribbon-left {
    border-width: 20px 15px 0 0;
    border-color: #ff6b9d transparent transparent transparent;
}

.ribbon-center {
    background: #ff6b9d;
    padding: 10px 20px;
    font-size: 24px;
    color: white;
    border-radius: 5px;
}

.ribbon-right {
    border-width: 20px 0 0 15px;
    border-color: #ff6b9d transparent transparent transparent;
}

.title {
    font-size: 48px;
    color: #5a3d5c;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    font-weight: bold;
}

.subtitle {
    font-size: 18px;
    color: #7a5a7c;
    margin-bottom: 40px;
}

.open-btn {
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
    color: white;
    border: none;
    padding: 18px 40px;
    font-size: 20px;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(255, 107, 157, 0.4);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 auto;
    font-weight: bold;
}

.open-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(255, 107, 157, 0.6);
}

.open-btn:active {
    transform: translateY(-1px);
}

.heart {
    font-size: 24px;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

.card-inner {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: visible;
}

/* Story Container */
.story-container {
    position: relative;
    background: linear-gradient(135deg, #ffffff 0%, #ffffff 100%);
    border-radius: 5px;
    padding: 0;
    margin-bottom: 20px;
    max-height: 300px;
    animation: slideDown 0.8s ease-out;
    z-index: 1;
    overflow: hidden;
}

.story-scroll {
    max-height: 300px;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    will-change: scroll-position;
    overscroll-behavior: contain;
}

.story-scroll::-webkit-scrollbar {
    width: 3px;
}

.story-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.story-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 107, 157, 0.3);
    border-radius: 10px;
    transition: background 0.2s ease;
}

.story-scroll::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 107, 157, 0.6);
}

/* Story Slides */
.story-slide {
    min-height: 300px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 25px;
    box-sizing: border-box;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
}

.story-text {
    text-align: left;
    color: #5a3d5c;
    font-size: 15px;
    line-height: 1.8;
    width: 100%;
}

.story-text p {
    margin-bottom: 12px;
}

.story-text .signature {
    text-align: left;
    margin-left: 50px;
    font-style: italic;
    font-weight: bold;
}

.story-image-wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.story-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.story-caption {
    text-align: center;
    color: #5a3d5c;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
    padding: 0 10px;
    font-style: italic;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    color: #ff6b9d;
    font-size: 12px;
    font-weight: bold;
    pointer-events: none;
    opacity: 0.7;
    animation: bounce 2s ease-in-out infinite;
    z-index: 10;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Hide scroll indicator when scrolled */
.story-scroll.scrolled ~ .scroll-indicator {
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* Butterfly decorations */
.butterfly {
    position: absolute;
    width: 90px;
    height: auto;
    opacity: 1;
    animation: flutter 3s ease-in-out infinite;
    z-index: 100;
    pointer-events: none;
    display: block;
    /* filter: drop-shadow(0 3px 10px rgba(0, 0, 0, 0.2)); */
}

.butterfly-left {
    top: 60px;
    left: -60px;
    animation-delay: 0s;
}

.butterfly-right {
    top: -20px;
    right: -60px;
    animation-delay: 1.5s;
    animation-name: flutterRight; /* Animation riêng cho bướm bên phải (có scaleX) */
}

@keyframes flutter {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-5px) rotate(-5deg);
    }
    50% {
        transform: translateY(-10px) rotate(5deg);
    }
    75% {
        transform: translateY(-5px) rotate(-3deg);
    }
}

@keyframes flutterRight {
    0%, 100% {
        transform: scaleX(-1) translateY(0) rotate(0deg);
    }
    25% {
        transform: scaleX(-1) translateY(-5px) rotate(-5deg);
    }
    50% {
        transform: scaleX(-1) translateY(-10px) rotate(5deg);
    }
    75% {
        transform: scaleX(-1) translateY(-5px) rotate(-3deg);
    }
}

/* Flower decoration */
.flower-decoration {
    position: absolute;
    bottom: -3px;
    left: -90px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    animation: fadeInUp 1s ease-out 0.3s both;
    z-index: 1000;
    rotate: 20deg;
    /* transform: rotate(20deg); */
    pointer-events: none;
}

.flower {
    width: 250px;
    height: auto;
    animation: float 3s ease-in-out infinite;
   
    transform-style: preserve-3d;
    transition: transform 0.3s ease;
}

.flower:hover {
    transform: scale(1.1) translateZ(10px);
}

.flower img {
    width: 100%;
    height: auto;
    display: block;
    pointer-events: none;
}

.flower:nth-child(1) {
    animation-delay: 0s;
}

.flower:nth-child(2) {
    animation-delay: 0.5s;
    margin-left: 20px;
}

.flower:nth-child(3) {
    animation-delay: 1s;
    margin-left: 10px;
}

/* Polaroid container */
.polaroid-container {
    position: absolute;
    bottom: 60px;
    right: -20px;
    z-index: 5;
    animation: slideInRight 1s ease-out 0.5s both;
}

.polaroid-frame {
    background: white;
    padding: 10px 10px 40px 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    transform: rotate(20deg);
    transition: transform 0.3s ease;
}

.polaroid-frame:hover {
    transform: rotate(0deg) scale(1.05);
}

.polaroid-photo {
    width: 150px;
    height: 180px;
    object-fit: cover;
    display: block;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px) rotate(-5deg);
    }
    to {
        opacity: 1;
        transform: translateX(0) rotate(-5deg);
    }
}

.image-container {
    flex: 1;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.image-container:hover img {
    transform: scale(1.05);
}

.message {
    text-align: center;
    margin-bottom: 20px;
}

.message h2 {
    font-size: 32px;
    color: #5a3d5c;
    margin-bottom: 10px;
}

.message p {
    font-size: 18px;
    color: #7a5a7c;
}


.close-btn {
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 16px;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.4);
    transition: all 0.3s ease;
    font-weight: bold;
    margin-top: 20px;
    align-self: center;
    z-index: 200;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    margin-left: -80px;
}

.close-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(255, 107, 157, 0.6);
}

.close-btn:active {
    transform: translateY(-1px);
}

/* Nút từ chối */
.reject-btn {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 16px;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(220, 53, 69, 0.4);
    transition: all 0.3s ease;
    font-weight: bold;
    z-index: 200;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    margin-left: 100px;
}

.reject-btn:hover {
    transform: translateX(-50%) translateY(-3px);
    box-shadow: 0 8px 20px rgba(220, 53, 69, 0.6);
}

.reject-btn:active {
    transform: translateX(-50%) translateY(-1px);
}

/* Container cho form gửi lời chúc */
.wish-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 20000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.wish-content {
    background: linear-gradient(135deg, #fff5f5 0%, #ffe0e0 100%);
    border-radius: 20px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    position: relative;
    border: 3px solid rgba(255, 107, 157, 0.3);
}

.wish-close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(255, 107, 157, 0.2);
    border: none;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    font-size: 24px;
    color: #ff6b9d;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    line-height: 1;
}

.wish-close-btn:hover {
    background: rgba(255, 107, 157, 0.4);
    transform: rotate(90deg);
}

.wish-title {
    font-size: 28px;
    font-weight: bold;
    color: #ff6b9d;
    text-align: center;
    margin-bottom: 20px;
    font-family: "Imperial Script", cursive;
    letter-spacing: 2px;
}

.wish-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.wish-textarea {
    width: 100%;
    min-height: 150px;
    padding: 15px;
    border: 2px solid rgba(255, 107, 157, 0.3);
    border-radius: 15px;
    font-size: 16px;
    font-family: Arial, sans-serif;
    resize: vertical;
    background: white;
    transition: all 0.3s ease;
}

.wish-textarea:focus {
    outline: none;
    border-color: #ff6b9d;
    box-shadow: 0 0 10px rgba(255, 107, 157, 0.2);
}

.wish-info {
    display: flex;
    gap: 10px;
}

.wish-input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid rgba(255, 107, 157, 0.3);
    border-radius: 15px;
    font-size: 16px;
    background: white;
    transition: all 0.3s ease;
}

.wish-input:focus {
    outline: none;
    border-color: #ff6b9d;
    box-shadow: 0 0 10px rgba(255, 107, 157, 0.2);
}

.wish-submit-btn {
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.4);
    transition: all 0.3s ease;
}

.wish-submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(255, 107, 157, 0.6);
}

.wish-submit-btn:active {
    transform: translateY(-1px);
}

.wish-submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.wish-success {
    text-align: center;
    padding: 20px;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 15px;
    margin-top: 15px;
    animation: fadeIn 0.5s ease;
}

.wish-success p {
    color: #4caf50;
    font-size: 18px;
    font-weight: bold;
    margin: 0;
}

/* Container cho hiệu ứng từ chối */
.reject-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* background: rgba(0, 0, 0, 0.9); */
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.reject-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Đấm - Meme 1 */
.reject-fist {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    z-index: 10001;
    animation: fistPunch 1.5s ease-out;
    filter: drop-shadow(0 0 20px rgba(255, 0, 0, 0.8));
}

@keyframes fistPunch {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.3) translateX(-200px);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2) translateX(0);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1) translateX(0);
    }
}

/* Con dao */
.cay-dao-image {
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    z-index: 10001;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: daoAppear 1s ease-out;
    filter: drop-shadow(0 0 20px rgba(255, 0, 0, 0.8));
}

/* Ngón tay giữa - Meme 3 */
.reject-finger {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    z-index: 10002;
    animation: fingerAppear 1s ease-out;
    filter: drop-shadow(0 0 30px rgba(255, 0, 0, 0.9));
}

/* Meme 4 */
.reject-meme4 {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    z-index: 10002;
    animation: memeAppear 1s ease-out;
    filter: drop-shadow(0 0 30px rgba(255, 0, 0, 0.9));
}

/* Meme 5 */
.reject-meme5 {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    z-index: 10002;
    animation: memeAppear 1s ease-out;
    filter: drop-shadow(0 0 30px rgba(255, 0, 0, 0.9));
}

@keyframes memeAppear {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.3) rotate(-90deg);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
    }
}

@keyframes fingerAppear {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.3) rotate(-90deg);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
    }
}

/* Text từ chối */
.reject-text {
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 72px;
    font-weight: bold;
    color: #ffffff;
    text-shadow: 
        0 0 10px rgba(0, 0, 0, 0.8),
        0 0 20px rgba(0, 0, 0, 0.6),
        0 0 30px rgba(0, 0, 0, 0.4),
        3px 3px 0px rgba(0, 0, 0, 0.8);
    z-index: 10003;
    font-family: "Arial", sans-serif;
    letter-spacing: 2px;
    animation: textAppear 1s ease-out, textShake 0.5s ease-in-out 1s infinite;
    white-space: nowrap;
}

@keyframes textAppear {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(-50px) scale(0.5);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

@keyframes textShake {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    25% {
        transform: translateX(-50%) translateY(-3px) rotate(-1deg);
    }
    75% {
        transform: translateX(-50%) translateY(3px) rotate(1deg);
    }
}

.cay-dao-image {
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    z-index: 10001;
    animation: daoAppear 0.5s ease-out;
    filter: drop-shadow(0 0 20px rgba(255, 0, 0, 0.8));
}

@keyframes daoAppear {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.5) rotate(-180deg);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
    }
}

/* Container cho hiệu ứng cảm ơn */
.thank-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 182, 193, 0.95);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.thank-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.thank-heart {
    max-width: 300px;
    max-height: 300px;
    object-fit: contain;
    z-index: 10001;
    animation: heartBeat 1s ease-out, heartPulse 1s ease-in-out 1s infinite;
    filter: drop-shadow(0 0 30px rgba(255, 20, 147, 0.8));
}

@keyframes heartBeat {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes heartPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.thank-text {
    margin-top: 30px;
    font-size: 48px;
    font-weight: bold;
    color: #ffffff;
    text-shadow: 
        0 0 10px rgba(0, 0, 0, 0.8),
        0 0 20px rgba(0, 0, 0, 0.6),
        0 0 30px rgba(0, 0, 0, 0.4);
    z-index: 10002;
    font-family: "Arial", sans-serif;
    letter-spacing: 3px;
    animation: textFadeIn 1s ease-out 0.5s both;
}

@keyframes textFadeIn {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hiệu ứng máu phun */
.blood-splatter {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10002;
    overflow: hidden;
}

.blood-drop {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #dc3545;
    border-radius: 50% 0 50% 50%;
    animation: bloodSplatter 1.5s ease-out forwards;
    box-shadow: 0 0 10px rgba(220, 53, 69, 0.8);
}

.blood-drop::before {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: #8b0000;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes bloodSplatter {
    0% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    50% {
        opacity: 0.8;
    }
    100% {
        opacity: 0;
        transform: translate(var(--splash-x), var(--splash-y)) scale(0.3);
    }
}

/* Nút điều khiển nhạc */
.music-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);
    border: 2px solid rgba(255, 107, 157, 0.5);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    opacity: 0;
}

.card.opened .music-btn {
    display: flex;
    opacity: 1;
    animation: fadeInMusicBtn 0.5s ease 0.5s both;
}

@keyframes fadeInMusicBtn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.music-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(255, 107, 157, 0.4);
    border-color: rgba(255, 107, 157, 0.8);
}

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

.music-btn.playing {
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.9) 0%, rgba(196, 69, 105, 0.9) 100%);
    border-color: rgba(255, 107, 157, 1);
    animation: musicPulse 2s ease-in-out infinite;
}

.music-icon {
    font-size: 24px;
    line-height: 1;
}

@keyframes musicPulse {
    0%, 100% {
        box-shadow: 0 5px 15px rgba(255, 107, 157, 0.4);
    }
    50% {
        box-shadow: 0 5px 25px rgba(255, 107, 157, 0.8);
    }
}

/* Nút lời nhắn */
.message-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 16px;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
    font-weight: bold;
    margin-top: 15px;
    align-self: center;
    z-index: 10;
    position: relative;
}

.message-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.6);
}

.message-btn:active {
    transform: translateY(-1px);
}

/* Container input lời nhắn */
.message-input-container {
    margin-top: 15px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    z-index: 10;
    position: relative;
    width: 90%;
    max-width: 500px;
    align-self: center;
    animation: fadeInUp 0.3s ease-out;
    z-index: 999999;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.name-input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ff6b9d;
    border-radius: 10px;
    font-size: 14px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #5a3d5c;
    outline: none;
    transition: all 0.3s ease;
    box-sizing: border-box;
    margin-bottom: 10px;
 
}

.name-input:focus {
    border-color: #c44569;
    box-shadow: 0 0 10px rgba(255, 107, 157, 0.3);
}

.name-input::placeholder {
    color: #b0b0b0;
}

.message-input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ff6b9d;
    border-radius: 10px;
    font-size: 14px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #5a3d5c;
    resize: vertical;
    outline: none;
    transition: all 0.3s ease;
    box-sizing: border-box;
    z-index: 99999;
}

.message-input:focus {
    border-color: #c44569;
    box-shadow: 0 0 10px rgba(255, 107, 157, 0.3);
}

.message-input::placeholder {
    color: #b0b0b0;
}

.send-message-btn {
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
    color: white;
    border: none;
    padding: 10px 25px;
    font-size: 14px;
    border-radius: 25px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.4);
    transition: all 0.3s ease;
    font-weight: bold;
    margin-top: 10px;
    width: 100%;
}

.send-message-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 107, 157, 0.6);
}

.send-message-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.message-status {
    margin-top: 10px;
    padding: 8px;
    border-radius: 8px;
    font-size: 13px;
    text-align: center;
    display: none;
}

.message-status.success {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
    border: 1px solid #4caf50;
}

.message-status.error {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
    border: 1px solid #f44336;
}

.message-status.loading {
    background: rgba(33, 150, 243, 0.2);
    color: #2196f3;
    border: 1px solid #2196f3;
}

/* Responsive */
@media (max-width: 650px) {
    body {
        padding: 10px;
        align-items: center;
        justify-content: center;
    }
    
    .container {
        width: 100%;
        max-width: 100%;
        padding: 10px;
        margin: 0 auto;
    }
    
    .card {
        height: 420px;
        max-height: calc(100vh - 20px);
    }
    
    .card.opened {
        max-height: calc(100vh - 20px);
    }
    
    .card.opened .card-back {
        height: calc(100vh - 20px);
        max-height: calc(100vh - 20px);
    }
    
    .thiep-scroll-container {
        padding-bottom: 70px;
    }
    
    .thiep-section {
        min-height: auto;
        height: auto;
        padding: 10px 15px;
        margin-bottom: 5px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .thiep-image {
        border-radius: 10px;
        max-height: calc(100vh - 120px);
        width: auto;
        height: auto;
        max-width: 100%;
        object-fit: contain;
    }
    
    .title {
        font-size: 36px;
    }
    
    .subtitle {
        font-size: 16px;
    }
    
    .open-btn {
        padding: 15px 30px;
        font-size: 18px;
    }
    
    .story-container {
        max-height: 200px;
    }
    
    .story-scroll {
        max-height: 200px;
    }
    
    .story-slide {
        min-height: 200px;
        padding: 15px;
    }
    
    .story-text {
        font-size: 13px;
    }
    
    .story-image {
        height: 160px;
    }
    
    .story-caption {
        font-size: 12px;
    }
    
    .scroll-indicator {
        font-size: 10px;
    }
    
    .scroll-indicator-thiep {
        font-size: 12px;
        padding: 6px 12px;
        bottom: 70px;
    }
    
    .polaroid-photo {
        width: 100px;
        height: 120px;
    }
    
    .flower {
        width: 180px;
    }
    
    .flower-decoration {
        bottom: -10px;
        left: -70px;
    }
    
    .polaroid-container {
        bottom: 40px;
        right: -10px;
    }
    
    .envelope {
        width: 220px;
        height: 160px;
        margin: 0 auto;
    }
    
    .envelope-body {
        height: 110px;
        left: 50%;
        transform: translateX(-50%);
        width: 100%;
    }
    
    .envelope-flap {
        height: 110px;
    }
    
    .envelope-hint {
        margin-top: 180px;
        font-size: 12px;
    }
    
    .envelope-name {
        font-size: 16px;
        padding: 8px 15px;
        max-width: 80%;
    }
    
    .guest-name-outside {
        font-size: 20px;
        padding: 10px 20px;
        top: 15px;
        max-width: 85%;
    }
    
    .guest-name-inside {
        font-size: 18px;
        padding: 10px 20px;
        top: 15px;
        max-width: 85%;
    }
    
    /* Nút nhạc mobile */
    .music-btn {
        width: 45px;
        height: 45px;
        top: 15px;
        right: 15px;
    }
    
    .music-icon {
        font-size: 20px;
    }
    
    /* Nút đóng mobile */
    .close-btn {
        padding: 10px 20px;
        font-size: 14px;
        bottom: 15px;
    }
    
    /* Text từ chối mobile */
    .reject-text {
        font-size: 48px;
        top: 10%;
        letter-spacing: 3px;
    }
    
    .cay-dao-image {
        max-width: 90%;
        max-height: 70vh;
    }
    
    .reject-fist,
    .reject-finger,
    .reject-meme4,
    .reject-meme5 {
        max-width: 90%;
        max-height: 70vh;
    }
    
    /* Tuyết mobile - giảm số lượng */
    .snowflake.small {
        font-size: 0.6em;
    }
    
    .snowflake.medium {
        font-size: 0.8em;
    }
    
    .snowflake.large {
        font-size: 1.1em;
    }
    
    .snowflake.xlarge {
        font-size: 1.4em;
    }
    
    /* Shin C image mobile */
    .shin-c-image {
        max-width: 90%;
    }
    
    .click-hint {
        font-size: 14px;
        margin-top: 15px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 5px;
    }
    
    .container {
        padding: 5px;
    }
    
    .card {
        height: calc(100vh - 10px);
        max-height: calc(100vh - 10px);
    }
    
    .card.opened {
        max-height: calc(100vh - 10px);
    }
    
    .card.opened .card-back {
        height: calc(100vh - 10px);
        max-height: calc(100vh - 10px);
    }
    
    .thiep-scroll-container {
        padding-bottom: 60px;
    }
    
    .thiep-section {
        min-height: auto;
        height: auto;
        padding: 8px 10px;
        margin-bottom: 3px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .thiep-image {
        border-radius: 8px;
        max-height: calc(100vh - 100px);
        width: auto;
        height: auto;
        max-width: 100%;
        object-fit: contain;
    }
    
    .flower {
        width: 150px;
    }
    
    .flower-decoration {
        left: -60px;
    }
    
    /* Nút nhạc mobile nhỏ */
    .music-btn {
        width: 40px;
        height: 40px;
        top: 10px;
        right: 10px;
    }
    
    .music-icon {
        font-size: 18px;
    }
    
    /* Nút đóng mobile nhỏ */
    .close-btn {
        padding: 8px 18px;
        font-size: 13px;
        bottom: 10px;
        margin-left: -50px;
    }
    
    .reject-btn {
        padding: 8px 18px;
        font-size: 13px;
        bottom: 10px;
        margin-left: 50px;
    }
    
    /* Scroll indicator mobile nhỏ */
    .scroll-indicator-thiep {
        font-size: 11px;
        padding: 5px 10px;
        bottom: 60px;
    }
    
    /* Envelope mobile nhỏ */
    .envelope {
        width: 200px;
        height: 140px;
        margin: 0 auto;
    }
    
    .envelope-body {
        height: 100px;
        left: 50%;
        transform: translateX(-50%);
        width: 100%;
    }
    
    .envelope-flap {
        height: 100px;
    }
    
    .envelope-hint {
        margin-top: 160px;
        font-size: 11px;
    }
    
    .envelope-name {
        font-size: 14px;
        padding: 6px 12px;
        max-width: 75%;
    }
    
    .guest-name-outside {
        font-size: 18px;
        padding: 8px 16px;
        top: 10px;
        max-width: 80%;
    }
    
    .guest-name-inside {
        font-size: 16px;
        padding: 8px 16px;
        top: 10px;
        max-width: 80%;
    }
    
    /* Shin C mobile nhỏ */
    .shin-c-image {
        max-width: 85%;
    }
    
    .click-hint {
        font-size: 13px;
        margin-top: 10px;
    }
    
    /* Tuyết mobile nhỏ - giảm thêm */
    .snowflake.small {
        font-size: 0.5em;
    }
    
    .snowflake.medium {
        font-size: 0.7em;
    }
    
    .snowflake.large {
        font-size: 1em;
    }
    
    .snowflake.xlarge {
        font-size: 1.2em;
    }
}

/* Mobile landscape */
@media (max-width: 900px) and (max-height: 500px) and (orientation: landscape) {
    body {
        padding: 5px;
    }
    
    .container {
        padding: 5px;
    }
    
    .card {
        height: calc(100vh - 10px);
        max-height: calc(100vh - 10px);
    }
    
    .card.opened .card-back {
        height: calc(100vh - 10px);
        max-height: calc(100vh - 10px);
    }
    
    .thiep-scroll-container {
        padding-bottom: 50px;
    }
    
    .thiep-section {
        min-height: auto;
        height: auto;
        padding: 5px 8px;
        margin-bottom: 2px;
    }
    
    .thiep-image {
        max-height: calc(100vh - 60px);
        width: auto;
        height: auto;
        max-width: 100%;
    }
    
    .music-btn {
        width: 35px;
        height: 35px;
        top: 8px;
        right: 8px;
    }
    
    .music-icon {
        font-size: 16px;
    }
    
    .close-btn {
        padding: 6px 14px;
        font-size: 12px;
        bottom: 8px;
        margin-left: -40px;
    }
    
    .reject-btn {
        padding: 6px 14px;
        font-size: 12px;
        bottom: 8px;
        margin-left: 40px;
    }
    
    /* Text từ chối mobile nhỏ */
    .reject-text {
        font-size: 36px;
        top: 8%;
        letter-spacing: 2px;
    }
    
    .reject-fist {
        max-width: 95%;
        max-height: 65vh;
    }
    
    .reject-finger {
        max-width: 95%;
        max-height: 65vh;
    }
    
    .reject-meme4,
    .reject-meme5 {
        max-width: 95%;
        max-height: 65vh;
    }
    
    .cay-dao-image {
        max-width: 95%;
        max-height: 65vh;
    }
    
    /* Hiệu ứng cảm ơn mobile nhỏ */
    .thank-heart {
        max-width: 150px;
        max-height: 150px;
    }
    
    .thank-text {
        font-size: 28px;
        margin-top: 15px;
        letter-spacing: 1px;
    }
    
    .scroll-indicator-thiep {
        font-size: 10px;
        padding: 4px 8px;
        bottom: 45px;
    }
    
    .envelope {
        width: 180px;
        height: 120px;
        margin: 0 auto;
    }
    
    .envelope-body {
        height: 85px;
        left: 50%;
        transform: translateX(-50%);
        width: 100%;
    }
    
    .envelope-flap {
        height: 85px;
    }
    
    .envelope-hint {
        margin-top: 140px;
        font-size: 10px;
    }
}

/* Tối ưu cho touch devices */
@media (hover: none) and (pointer: coarse) {
    .music-btn:active {
        transform: scale(0.9);
    }
    
    .close-btn:active {
        transform: translateY(-1px) scale(0.98);
    }
    
    .shin-c-image:active {
        transform: scale(0.95);
    }
    
    .envelope:active {
        transform: scale(0.98);
    }
    
    /* Tăng kích thước touch target */
    .music-btn {
        min-width: 44px;
        min-height: 44px;
    }
    
    .close-btn {
        min-height: 44px;
    }
    
    /* Form gửi lời chúc mobile */
    .wish-content {
        padding: 20px;
        max-width: 95%;
    }
    
    .wish-title {
        font-size: 24px;
    }
    
    .wish-textarea {
        min-height: 120px;
        font-size: 14px;
    }
    
    .wish-input {
        font-size: 14px;
    }
    
    .wish-submit-btn {
        padding: 12px 25px;
        font-size: 16px;
    }
}