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

html{
    scroll-behavior:smooth;
}

body{
    font-family:'Montserrat',sans-serif;
    background:#f8f5f1;
    color:#1f1f1f;
    line-height:1.6;
}

section{
    padding:80px 20px;
}

h1,h2,h3{
    text-align:center;
}

h2{
    font-size:42px;
    margin-bottom:20px;
    font-weight:300;
}

/* HERO */

.hero{
    min-height:100vh;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    background:#f8f5f1;
}

.hero-content{
    max-width:800px;
}

.date{
    color:#c62828;
    font-weight:600;
    margin-bottom:30px;
    letter-spacing:4px;
    text-transform:uppercase;
}

.hero h1{
    font-size:92px;
    margin-bottom:20px;
    font-weight:300;
}

.hero h1 span{
    color:#c62828;
    font-family:'Marck Script',cursive;
}

.subtitle{
    font-size:22px;
    max-width:600px;
    margin:0 auto 40px;
}

.btn{
    display:inline-block;
    padding:16px 34px;
    background:#c62828;
    color:#fff;
    text-decoration:none;
    border-radius:50px;
    transition:.3s;
}

.btn:hover{
    transform:translateY(-3px);
}

/* ПРИГЛАШЕНИЕ */

.invite-image{
    padding:40px 20px;
    background:#f8f5f1;
}

.invite-image img{
    width:100%;
    max-width:700px;
    display:block;
    margin:0 auto;
    border-radius:20px;
    box-shadow:0 15px 50px rgba(0,0,0,.12);
}

/* ТАЙМЕР */

.timer-section{
    text-align:center;
    background:#fff;
}

.timer{
    display:flex;
    justify-content:center;
    gap:30px;
    margin-top:40px;
    flex-wrap:wrap;
}

.timer div{
    width:120px;
}

.timer span{
    display:block;
    font-size:56px;
    font-weight:700;
    color:#c62828;
}

/* ДАТА */

.info{
    text-align:center;
}

.big-date{
    font-size:220px;
    font-weight:700;
    color:#c62828;
    line-height:1;
}

.info p{
    font-size:28px;
}

/* ЛОКАЦИЯ */

.location{
    background:#fff;
    text-align:center;
}

.location h3{
    margin:20px 0;
    font-size:32px;
    font-weight:500;
}

.location p{
    margin-bottom:12px;
    font-size:18px;
}

/* ПОЖЕЛАНИЯ */

.wishes{
    max-width:1000px;
    margin:0 auto;
}

.wish-card{
    background:#fff;
    padding:25px;
    border-radius:20px;
    margin-top:20px;
    box-shadow:0 10px 30px rgba(0,0,0,.05);
    font-size:18px;
}

/* ДРЕСС-КОД */

.dresscode{
    text-align:center;
}

.colors{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:18px;
    margin-top:40px;
}

.colors span{
    width:90px;
    height:90px;
    border-radius:50%;
    display:block;
    border:2px solid rgba(0,0,0,.05);
}

/* RSVP */

.rsvp{
    background:#fff;
}

.rsvp form{
    max-width:600px;
    margin:0 auto;
    display:flex;
    flex-direction:column;
    gap:15px;
}

.rsvp input,
.rsvp select,
.rsvp textarea{
    padding:16px;
    border:1px solid #ddd;
    border-radius:12px;
    font-size:16px;
    font-family:inherit;
}

.rsvp textarea{
    min-height:140px;
    resize:none;
}

.rsvp button{
    background:#c62828;
    color:white;
    border:none;
    padding:16px;
    border-radius:12px;
    cursor:pointer;
    font-size:18px;
}

/* FOOTER */

.footer{
    text-align:center;
}

.footer h2{
    font-family:'Marck Script',cursive;
    color:#c62828;
    font-size:72px;
}

.footer p{
    margin-top:10px;
    font-size:28px;
}

/* MOBILE */

@media(max-width:768px){

    section{
        padding:60px 16px;
    }

    .hero h1{
        font-size:56px;
    }

    .subtitle{
        font-size:18px;
    }

    .big-date{
        font-size:120px;
    }

    .timer{
        gap:15px;
    }

    .timer div{
        width:90px;
    }

    .timer span{
        font-size:36px;
    }

    .location h3{
        font-size:24px;
    }

    .colors span{
        width:60px;
        height:60px;
    }

    .footer h2{
        font-size:52px;
    }
}
```
```css
.success-message{
    background:#ffffff;
    border:2px solid #c62828;
    color:#c62828;
    padding:30px;
    border-radius:20px;
    text-align:center;
    font-size:22px;
    line-height:1.8;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
}
```
.success-message {
    max-width: 600px;
    margin: 40px auto;
    padding: 30px 25px;
    background: #fff;
    border-radius: 20px;
    text-align: center;
    font-size: 20px;
    font-weight: 500;
    line-height: 1.6;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from {opacity:0; transform: translateY(20px);}
    to {opacity:1; transform: translateY(0);}
}
.success-message {
    background: #fff;
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,.05);
    font-size: 18px;
    text-align: center;
    max-width: 600px;
    margin: 40px auto 0 auto;
}