:root {
    --bg-color: #ffffff;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --primary: #000000;
    --primary-hover: #374151;
    --border-color: #e5e7eb;
    --error: #ef4444;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: none;
}
.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    text-align: center;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.login-card h2 { text-align: center; margin-bottom: 8px; font-weight: 700; font-size: 24px; letter-spacing: -0.03em; color: var(--text-main); }
.login-card p { text-align: center; color: var(--text-muted); margin-bottom: 32px; font-size: 14px; }
.form-group { margin-bottom: 24px; text-align: left; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--text-main); }
.form-group input {
    width: 100%; padding: 12px 16px; border-radius: 8px; border: 1px solid var(--border-color);
    background: #f9fafb; color: var(--text-main); font-size: 15px; outline: none; transition: all 0.2s ease;
}
.form-group input:focus { border-color: var(--primary); background: #ffffff; box-shadow: 0 0 0 1px var(--primary); }
.btn-login {
    width: 100%; padding: 14px; background: var(--primary); color: white; border: none; border-radius: 8px;
    font-size: 15px; font-weight: 600; cursor: pointer; transition: all 0.2s ease;
}
.btn-login:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-login:active { transform: scale(0.98); }
.error-msg { color: var(--error); background: #fef2f2; border: 1px solid #fecaca; padding: 12px; border-radius: 8px; font-size: 13px; text-align: center; margin-bottom: 20px; display: none; font-weight: 500; }