@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --color-bg:      #f1f5f9;
    --color-surface: #ffffff;
    --color-primary: #2563eb;
    --color-primary-h: #1d4ed8;
    --color-border:  #e2e8f0;
    --color-text:    #1e293b;
    --color-muted:   #64748b;
    --shadow-md:     0 4px 16px rgba(0,0,0,.10), 0 1px 4px rgba(0,0,0,.06);
    --radius-md:     12px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', Arial, sans-serif;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--color-bg);
    background-image: radial-gradient(ellipse at 60% 20%, rgba(37,99,235,.10) 0%, transparent 60%),
                      radial-gradient(ellipse at 20% 80%, rgba(99,102,241,.08) 0%, transparent 50%);
}

.login-container {
    width: 380px;
    padding: 40px 36px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    text-align: center;
}

.login-logo {
    width: 52px;
    height: 52px;
    background: var(--color-primary);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
    color: #fff;
    font-weight: 700;
    letter-spacing: -1px;
}

h2 {
    margin: 0 0 6px;
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -.3px;
}

.login-subtitle {
    margin: 0 0 28px;
    font-size: 14px;
    color: var(--color-muted);
}

.form-group {
    margin-bottom: 16px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: .4px;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color .2s, box-shadow .2s;
    outline: none;
}

.form-group input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
    background: #fff;
}

.error-message {
    color: #dc2626;
    margin-bottom: 16px;
    font-size: 13px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 6px;
    padding: 8px 12px;
    text-align: left;
}

.login-btn {
    width: 100%;
    padding: 12px;
    border: none;
    background: var(--color-primary);
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    font-family: inherit;
    font-weight: 600;
    letter-spacing: .1px;
    transition: background .2s, transform .15s, box-shadow .2s;
    box-shadow: 0 2px 8px rgba(37,99,235,.30);
    margin-top: 4px;
}

.login-btn:hover {
    background: var(--color-primary-h);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(37,99,235,.35);
}

.login-btn:active {
    transform: translateY(0);
}