:root {
    --apple-bg: #f5f5f7;
    --apple-card-bg: #ffffff;
    --apple-text-main: #1d1d1f;
    --apple-text-muted: #86868b;
    --apple-blue: #0071e3;
    --apple-blue-hover: #0077ed;
    --apple-border: #d2d2d7;
    --apple-error-bg: #fef0f0;
    --apple-error-text: #e30000;
}

body {
    background-color: var(--apple-bg);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Kanit", sans-serif;
    margin: 0;
    color: var(--apple-text-main);
}

.login-container {
    background: var(--apple-card-bg);
    padding: 3rem 2.5rem;
    border-radius: 24px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.04);
    width: 100%;
    max-width: 420px;
    animation: fadeScaleIn 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeScaleIn {
    0% { opacity: 0; transform: scale(0.95) translateY(10px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

h2 {
    color: var(--apple-text-main);
    font-weight: 600;
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--apple-text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    font-weight: 400;
}

.form-control {
    border-radius: 12px;
    border: 1px solid var(--apple-border);
    padding: 0.8rem 1rem;
    font-size: 1rem;
    color: var(--apple-text-main);
    background-color: #ffffff;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: var(--apple-blue);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.15);
    background-color: #ffffff;
}

.form-control::placeholder {
    color: #a1a1a6;
    font-weight: 300;
}

.form-label {
    color: var(--apple-text-main);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.btn-login {
    background-color: var(--apple-blue);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 0.85rem;
    font-weight: 500;
    font-size: 1.05rem;
    transition: background-color 0.2s ease, transform 0.1s ease;
    margin-top: 1rem;
}

.btn-login:hover {
    background-color: var(--apple-blue-hover);
    color: white;
}

.btn-login:active {
    transform: scale(0.98);
}

.form-check-input {
    width: 1.2em;
    height: 1.2em;
    margin-top: 0.15em;
    border-color: var(--apple-border);
    cursor: pointer;
}

.form-check-input:checked {
    background-color: var(--apple-blue);
    border-color: var(--apple-blue);
}

.form-check-label {
    color: var(--apple-text-main);
    font-size: 0.9rem;
    cursor: pointer;
    padding-left: 0.2rem;
}

.alert-danger {
    background-color: var(--apple-error-bg);
    color: var(--apple-error-text);
    border-radius: 12px;
    border: 1px solid rgba(227, 0, 0, 0.1);
    font-size: 0.9rem;
    padding: 1rem;
    font-weight: 400;
}

.forgot-password {
    color: var(--apple-blue);
    font-size: 0.9rem;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.forgot-password:hover {
    opacity: 0.8;
    text-decoration: underline;
}