:root {
    --c-blue: #00A3E0;
    --c-green: #73C92D;
    --c-grey: #91999F;
    --c-dark: #2f363b;
    --c-text: #2d3439;
    --c-muted: #6f7a82;
    --c-bg: #f4f7f6;
    --c-white: #ffffff;
    --c-danger: #dc3545;
    --radius-sm: 8px;
    --radius-md: 14px;
    --shadow-sm: 0 4px 16px rgba(27, 48, 61, 0.08);
    --shadow-md: 0 12px 30px rgba(27, 48, 61, 0.12);
    --font-main: "Trebuchet MS", Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    font-family: var(--font-main);
    color: var(--c-text);
    background: var(--c-bg);
}

button,
input,
select,
textarea {
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 10px 16px;
    border: 0;
    border-radius: var(--radius-sm);
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.18s ease, opacity 0.18s ease, box-shadow 0.18s ease;
}

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

.btn-blue {
    background: var(--c-blue);
    color: var(--c-white);
}

.btn-green {
    background: var(--c-green);
    color: var(--c-white);
}

.btn-grey {
    background: var(--c-grey);
    color: var(--c-white);
}

.btn-light {
    background: var(--c-white);
    color: var(--c-text);
    border: 1px solid #dfe5e8;
}

.btn-danger {
    background: var(--c-danger);
    color: var(--c-white);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
}

.alert-error {
    background: #fff0f1;
    color: #a92331;
    border: 1px solid #f4c5ca;
}

.alert-success {
    background: #f3fbe9;
    color: #477e1e;
    border: 1px solid #d6edbd;
}

.alert-warning {
    background: #fff8e7;
    color: #856404;
    border: 1px solid #ffe3a3;
}