:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --accent: #14532d;
    --accent-hover: #166534;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;
    --border: #d1d5db;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: radial-gradient(circle at top, #e0f2fe, var(--bg));
    color: var(--text);
}

.login-wrapper {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1rem;
}

.login-card {
    width: min(420px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

h1 {
    margin: 0;
    font-size: 1.8rem;
}

.subheading {
    margin: 0.45rem 0 1.4rem;
    color: var(--muted);
}

label {
    display: block;
    margin-bottom: 0.45rem;
    font-weight: 600;
}

input {
    width: 100%;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.7rem 0.8rem;
    font-size: 1rem;
}

input:focus {
    outline: 2px solid #86efac;
    border-color: #16a34a;
}

button {
    width: 100%;
    border: 0;
    border-radius: 10px;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 700;
    color: #ffffff;
    background: var(--accent);
    cursor: pointer;
}

button:hover {
    background: var(--accent-hover);
}

.alert {
    border: 1px solid #fecaca;
    border-radius: 10px;
    background: var(--danger-bg);
    color: var(--danger-text);
    padding: 0.7rem 0.8rem;
    margin-bottom: 1rem;
}