:root {
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --bg-body: #F3F4F6;
    --bg-card: #FFFFFF;
    --text-main: #1F2937;
    --text-muted: #6B7280;
    --border-input: #D1D5DB;
    --border-focus: #2563EB;
}

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

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

.login-container {
    width: 100%;
    max-width: 440px;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 32px;
}

.header h1 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -1px;
    color: var(--text-main);
}

.header h1 span {
    color: var(--primary);
}

.header p {
    color: var(--text-muted);
    font-size: 16px;
}

.card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-input);
    border-radius: 8px;
    font-size: 16px;
    background-color: #F9FAFB;
    transition: all 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--border-focus);
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 10px;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.footer-link {
    margin-top: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}

.footer-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.footer-link a:hover {
    text-decoration: underline;
}