* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #f5f5f5;
    --card-bg: #ffffff;
    --border: #d1d9e0;
    --text: #1f2328;
    --text-dim: #636c76;
    --title: #0969da;
    --input-bg: #ffffff;
    --input-border: #d1d9e0;
    --input-text: #1f2328;
    --btn-bg: #1a7f37;
    --btn-hover: #116329;
    --error: #cf222e;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px 36px 32px;
    width: 360px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.login-logo {
    margin-bottom: 8px;
}

.login-logo img {
    max-height: 60px;
    width: auto;
}

.login-title {
    font-size: 22px;
    font-weight: 300;
    letter-spacing: 8px;
    color: var(--text-dim);
    margin-bottom: 32px;
}

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

.field label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dim);
    margin-bottom: 6px;
}

.field input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 6px;
    padding: 10px 12px;
    color: var(--input-text);
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
}

.field input:focus {
    border-color: var(--title);
}

.field input::placeholder {
    color: var(--text-dim);
    opacity: 0.5;
}

.login-msg {
    font-size: 13px;
    min-height: 20px;
    margin-bottom: 8px;
    color: var(--error);
}

.btn-login {
    width: 100%;
    background: var(--btn-bg);
    border: none;
    border-radius: 6px;
    padding: 10px;
    color: #fff;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
}

.btn-login:hover { background: var(--btn-hover); }
.btn-login:disabled { opacity: 0.5; cursor: not-allowed; }

.login-footer {
    font-size: 12px;
    color: var(--text-dim);
    opacity: 0.5;
}