* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #eef8fb;
    color: #14313d;
}

a {
    color: inherit;
}

.site-header {
    background:
        linear-gradient(rgba(0, 72, 98, 0.78), rgba(0, 143, 179, 0.82)),
        radial-gradient(circle at top left, #64d8ff, transparent 35%),
        linear-gradient(135deg, #006d8f, #00bcd4);
    color: white;
    padding-bottom: 70px;
}

nav {
    max-width: 1100px;
    margin: auto;
    padding: 22px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
}

nav a {
    text-decoration: none;
    font-weight: bold;
    background: rgba(255, 255, 255, 0.16);
    padding: 10px 14px;
    border-radius: 999px;
}

.hero {
    max-width: 900px;
    margin: 70px auto 0;
    padding: 0 22px;
    text-align: center;
}

.hero h1 {
    font-size: 46px;
    margin-bottom: 15px;
    line-height: 1.1;
}

.hero p {
    font-size: 18px;
    line-height: 1.6;
}

.btn,
button {
    display: inline-block;
    background: #ffcf66;
    color: #14313d;
    padding: 12px 18px;
    border-radius: 8px;
    border: none;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    margin-top: 15px;
    transition: 0.2s;
}

.btn:hover,
button:hover {
    background: #ffd978;
    transform: translateY(-1px);
}

.section {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 22px;
}

.section h2 {
    color: #006d8f;
    font-size: 30px;
    margin-bottom: 18px;
}

.grille {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.carte,
.reservation,
.bloc-admin,
.stat-card,
.boite-login {
    background: white;
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 4px 15px rgba(0, 80, 100, 0.12);
}

.carte h3 {
    color: #007c9d;
    margin-top: 0;
}

.carte {
    border-top: 5px solid #00a6c8;
    transition: 0.2s;
}

.carte:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 22px rgba(0, 80, 100, 0.18);
}

.prix {
    color: #008fb3;
    font-weight: bold;
    font-size: 20px;
}

form {
    display: flex;
    flex-direction: column;
}

.ligne {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

label {
    font-weight: bold;
    margin-top: 12px;
    margin-bottom: 5px;
}

input,
select,
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #b7dce5;
    border-radius: 7px;
    font-size: 15px;
    background: #fbfeff;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #008fb3;
    box-shadow: 0 0 0 3px rgba(0, 166, 200, 0.18);
}

textarea {
    min-height: 90px;
}

.message {
    background: #dff7e8;
    color: #116030;
    padding: 12px;
    border-radius: 8px;
}

.erreur {
    background: #ffe1e1;
    color: #9b0000;
    padding: 12px;
    border-radius: 8px;
}

.aide-formulaire {
    background: #eef9fc;
    color: #35606d;
    padding: 10px 12px;
    border-left: 4px solid #00a6c8;
    border-radius: 8px;
    font-size: 14px;
}

footer {
    text-align: center;
    padding: 25px;
    color: #55727c;
}

.login-admin {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #006d8f, #00bcd4);
}

.boite-login {
    width: 370px;
}

.aide {
    color: #55727c;
    font-size: 14px;
}

.admin-header {
    background: linear-gradient(90deg, #005f7a, #00a6c8);
    color: white;
    padding: 18px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header h1 {
    margin: 0;
}

.admin-header a {
    color: white;
    margin-left: 18px;
    text-decoration: none;
    font-weight: bold;
}

.admin {
    max-width: 1150px;
    margin: 30px auto;
    padding: 0 22px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-bottom: 25px;
}

.stat-card p {
    font-size: 24px;
    font-weight: bold;
    color: #008fb3;
}

.stat-card {
    border-left: 6px solid #00a6c8;
}

.bloc-admin {
    margin-top: 25px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    background: white;
    border-radius: 10px;
    overflow: hidden;
}

th {
    background: #007c9d;
    color: white;
    text-align: left;
    padding: 11px;
}

td {
    border-bottom: 1px solid #d9edf2;
    padding: 10px;
}

tr:nth-child(even) {
    background: #f7fcfe;
}

tr:hover {
    background: #eef9fc;
}

.form-ligne {
    display: flex;
    flex-direction: row;
    gap: 8px;
}

.form-ligne input {
    width: 90px;
}

.form-ligne button {
    margin-top: 0;
    padding: 9px;
}

.danger {
    color: white;
    background: #d9534f;
    padding: 8px 10px;
    border-radius: 6px;
    text-decoration: none;
}

@media screen and (max-width: 800px) {
    .grille,
    .stats,
    .ligne {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 30px;
    }

    .admin-header,
    nav {
        flex-direction: column;
        gap: 12px;
    }
}