@import url('https://fonts.googleapis.com/css2?family=Overpass:wght@400;700&display=swap');

:root {
    --orange: hsl(25, 97%, 53%);
    --white: hsl(0, 0%, 100%);
    --light-grey: hsl(217, 12%, 63%);
    --medium-grey: hsl(216, 12%, 54%);
    --dark-blue: hsl(213, 19%, 18%);
    --very-dark-blue: hsl(216, 12%, 8%);
    
    --font-family: 'Overpass', sans-serif;
    --font-size-base: 15px;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    background-color: var(--very-dark-blue);
    color: var(--white);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1.5rem;
}

.card {
    background: radial-gradient(circle at top, var(--dark-blue), var(--very-dark-blue));
    border-radius: 2rem;
    padding: 2rem;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

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

h1, h2 {
    font-weight: 700;
    margin-bottom: 1rem;
}

p {
    color: var(--light-grey);
    margin-bottom: 1.5rem;
}

.star-icon {
    background-color: hsla(216, 12%, 54%, 0.1);
    padding: 1rem;
    border-radius: 50%;
    margin-bottom: 2rem;
    display: inline-block;
}

.rating-buttons {
    display: flex;
    justify-content: space-between;
    border: none;
    padding: 0;
    margin-bottom: 2rem;
}

.rating-buttons input[type="radio"] {
    display: none;
}

.rating-buttons label {
    background-color: hsla(216, 12%, 54%, 0.1);
    color: var(--light-grey);
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.rating-buttons label:hover,
.rating-buttons input[type="radio"]:checked + label {
    background-color: var(--orange);
    color: var(--white);
    transform: scale(1.1);
}

button[type="submit"] {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--orange);
    color: var(--white);
    border: none;
    border-radius: 2rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
}

button[type="submit"]:hover {
    background-color: var(--white);
    color: var(--orange);
    transform: scale(1.05);
}

.thank-you-start {
    text-align: center;
}

.thank-you-icon {
    margin-bottom: 2rem;
    animation: bounce 1s ease infinite;
}

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

.selected-rating {
    background-color: hsla(216, 12%, 54%, 0.1);
    color: var(--orange);
    padding: 0.5rem 1rem;
    border-radius: 1rem;
    display: inline-block;
    margin-bottom: 2rem;
}

.hidden {
    display: none;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-out {
    animation: fadeOut 0.5s ease-out;
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.attribution {
    position: absolute;
    bottom: 1rem;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.7rem;
    color: var(--light-grey);
}

.attribution a {
    color: var(--orange);
    text-decoration: none;
}

.attribution a:hover {
    text-decoration: underline;
}

.pulse {
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}