:root {
    --color-bg: #6699ac; /* Sea Glass Blue */
    --color-font: #45515d; /* Storm Slate */
    --color-navbar: #45515d;
    --color-card-header: #45515d;
    --color-card-body: #ffffff;
    --color-button-bg: linear-gradient(180deg, #6699ac 0%, #558aa0 100%);
    --color-button-hover: linear-gradient(180deg, #5e90a5 0%, #4d7d94 100%);
    --color-button-success: linear-gradient(180deg, #61aa75 0%, #4e9963 100%);
    --color-button-success-hover: linear-gradient(180deg, #4e9963 0%, #3e8653 100%);
    --color-link: #e97b7c; /* Rosy Coral */
    --color-link-hover: #b65658;
    --color-footer: #ffffffb3;
    --color-form-bg: #ffffff;
    --color-form-border: #e0e0e0;
    --color-placeholder: #9ca3a8;
    --color-focus-bg: #ffffff;
    --autofill-bg: #def0fb;
    --autofill-fg: #2b3339;
    --error-colour: #e97b7c; /* Rosy Coral */
}

body {
    background-color: var(--color-bg);
    font-family: 'Quicksand', sans-serif;
    color: var(--color-font);
}

.navbar {
    background-color: var(--color-navbar);
    padding: 1rem;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
}

.navbar-brand img {
    height: 48px;
}

.card {
    border: none;
    border-radius: 20px;
    overflow: hidden;
    background-color: var(--color-card-body);
    animation: fadeScaleIn 0.5s ease-out;
}

.card-header {
    background-color: var(--color-card-header);
    text-align: center;
    padding: 15px 10px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.card-header img {
    max-width: 260px;
    margin: 5px auto;
}

.card-body {
    background-color: var(--color-card-body);
    padding: 2rem;
    color: var(--color-font);
}

@keyframes fadeScaleIn {
    0% {
        opacity: 0;
        transform: scale(0.98);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.btn-primary,
.btn-custom,
.btn-success {
    padding: 0.5rem 1rem;
    font-size: 16px;
    background: var(--color-button-bg);
    border: none;
    color: white !important;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.05s ease-in-out;
    text-decoration: none !important;
}

.btn:active {
    transform: scale(0.996);
}

.btn-custom:hover,
.btn-custom:active,
.btn-custom:focus,
.btn-custom:visited {
    background: var(--color-button-hover);
    color: white !important;
}

.btn-success {
    background: var(--color-button-success);
}

.btn-success:hover,
.btn-success:active,
.btn-success:focus {
    background: var(--color-button-success-hover);
    color: white;
}

.form-control {
    border-radius: 12px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    height: 40px;
    background-color: var(--color-form-bg);
    color: var(--color-font);
    border: 1px solid var(--color-form-border);
}

.form-control::placeholder {
    color: var(--color-placeholder);
}

.form-control:focus {
    outline: none;
    background-color: var(--color-focus-bg);
}

input:-webkit-autofill {
    box-shadow: 0 0 0 30px var(--autofill-bg) inset !important;
    -webkit-text-fill-color: var(--autofill-fg) !important;
}

a {
    color: var(--color-link);
    transition: color 0.2s ease-in-out, transform 0.05s ease-in-out;
    display: inline-block;
}

a:hover,
a:active,
a:focus {
    color: var(--color-link-hover);
    text-decoration: underline;
}

h2 {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    color: var(--color-font);
    margin-bottom: 1.5rem;
}

.btn i {
    margin-right: 8px;
}

footer {
    animation: fadeScaleIn 0.5s ease-out 0.3s;
    animation-fill-mode: both;
    text-align: center;
    font-size: 14px;
    color: var(--color-footer);
    margin-top: 1rem;
}

.input-error {
    border: 2px solid var(--error-colour) !important;
    background-color: #fff0f0;
    transition: border 0.3s ease;
}

.hidden {
    display: none !important;
}